stylus.js

var bifs = "\
vendors = moz webkit o ms official\n\
\n\
// stringify the given arg\n\
\n\
-string(arg)\n\
  type(arg) + ' ' + arg\n\
\n\
// require a color\n\
\n\
require-color(color)\n\
  unless color is a 'color' \n\
    error('RGB or HSL value expected, got a ' + -string(color))\n\
\n\
// require a unit\n\
\n\
require-unit(n)\n\
  unless n is a 'unit'\n\
    error('unit expected, got a ' + -string(n))\n\
\n\
// require a string\n\
\n\
require-string(str)\n\
  unless str is a 'string' or str is a 'ident'\n\
    error('string expected, got a ' + -string(str))\n\
\n\
// apply js Math function\n\
\n\
math(n, fn) \n\
  require-unit(n)\n\
  require-string(fn)\n\
  -math(n, fn)\n\
\n\
// adjust the given color's property by amount\n\
\n\
adjust(color, prop, amount)\n\
  require-color(color)\n\
  require-string(prop)\n\
  require-unit(amount)\n\
  -adjust(color, prop, amount)\n\
\n\
// Math functions\n\
\n\
abs(n) { math(n, 'abs') }\n\
ceil(n) { math(n, 'ceil') }\n\
floor(n) { math(n, 'floor') }\n\
round(n) { math(n, 'round') }\n\
sin(n) { math(n, 'sin') }\n\
cos(n) { math(n, 'cos') }\n\
min(a, b) { a < b ? a : b }\n\
max(a, b) { a > b ? a : b }\n\
PI = -math-prop('PI')\n\
\n\
// return the sum of the given numbers\n\
\n\
sum(nums)\n\
  sum = 0\n\
  sum += n for n in nums\n\
\n\
// return the average of the given numbers\n\
\n\
avg(nums)\n\
  sum(nums) / length(nums)\n\
\n\
// color components\n\
\n\
alpha(color) { component(hsl(color), 'alpha') }\n\
hue(color) { component(hsl(color), 'hue') }\n\
saturation(color) { component(hsl(color), 'saturation') }\n\
lightness(color) { component(hsl(color), 'lightness') }\n\
\n\
// check if n is an odd number\n\
\n\
odd(n)\n\
  1 == n % 2\n\
\n\
// check if n is an even number\n\
\n\
even(n)\n\
  0 == n % 2\n\
\n\
// check if color is light\n\
\n\
light(color)\n\
  lightness(color) >= 50%\n\
\n\
// check if color is dark\n\
\n\
dark(color)\n\
  lightness(color) < 50%\n\
\n\
// desaturate color by amount\n\
\n\
desaturate(color, amount)\n\
  adjust(color, 'saturation', - amount)\n\
\n\
// saturate color by amount\n\
\n\
saturate(color, amount)\n\
  adjust(color, 'saturation', amount)\n\
\n\
// darken by the given amount\n\
\n\
darken(color, amount)\n\
  adjust(color, 'lightness', - amount)\n\
\n\
// lighten by the given amount\n\
\n\
lighten(color, amount)\n\
  adjust(color, 'lightness', amount)\n\
\n\
// decerase opacity by amount\n\
\n\
fade-out(color, amount)\n\
  color - rgba(black, amount)\n\
\n\
// increase opacity by amount\n\
\n\
fade-in(color, amount)\n\
  color + rgba(black, amount)\n\
\n\
// return the last value in the given expr\n\
\n\
last(expr)\n\
  expr[length(expr) - 1]\n\
\n\
// join values with the given delimiter\n\
\n\
join(delim, vals...)\n\
  buf = ''\n\
  vals = vals[0] if length(vals) == 1\n\
  for val, i in vals\n\
    buf += i ? delim + val : val\n\
";

var stylus = (function(){
function require(p){
    var path = require.resolve(p)
      , mod = require.modules[path];
    if (!mod) throw new Error('failed to require "' + p + '"');
    if (!mod.exports) {
      mod.exports = {};
      mod.call(mod.exports, mod, mod.exports, require.relative(path));
    }
    return mod.exports;
  }


require.modules = {};


require.resolve = function (path){
    var orig = path
      , reg = path + '.js'
      , index = path + '/index.js';
    return require.modules[reg] && reg
      || require.modules[index] && index
      || orig;
  };


require.register = function (path, fn){
    require.modules[path] = fn;
  };


require.relative = function (parent) {
    return function(p){
      if ('.' != p[0]) return require(p);
      
      var path = parent.split('/')
        , segs = p.split('/');
      path.pop();
      
      for (var i = 0; i < segs.length; i++) {
        var seg = segs[i];
        if ('..' == seg) path.pop();
        else if ('.' != seg) path.push(seg);
      }

      return require(path.join('/'));
    };
  };



require.register("path.js", function(module, exports, require){

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.


var isWindows = false;


// resolves . and .. elements in a path array with directory names there
// must be no slashes, empty elements, or device names (c:\) in the array
// (so also no leading and trailing slashes - it does not distinguish
// relative and absolute paths)
function normalizeArray(parts, allowAboveRoot) {
  // if the path tries to go above the root, `up` ends up > 0
  var up = 0;
  for (var i = parts.length-1; i >= 0; i--) {
    var last = parts[i];
    if (last == '.') {
      parts.splice(i, 1);
    } else if (last === '..') {
      parts.splice(i, 1);
      up++;
    } else if (up) {
      parts.splice(i, 1);
      up--;
    }
  }

  // if the path is allowed to go above the root, restore leading ..s
  if (allowAboveRoot) {
    for (; up--; up) {
      parts.unshift('..');
    }
  }

  return parts;
}


 // Regex to split a filename into [*, dir, basename, ext]
// posix version
var splitPathRe = /^([\s\S]+\/(?!$)|\/)?((?:[\s\S]+?)?(\.[^.]*)?)$/;

// path.normalize(path)
// posix version
exports.normalize = function(path) {
  var isAbsolute = path.charAt(0) === '/',
      trailingSlash = path.slice(-1) === '/';

  // Normalize the path
  path = normalizeArray(path.split('/').filter(function(p) {
    return !!p;
  }), !isAbsolute).join('/');

  if (!path && !isAbsolute) {
    path = '.';
  }
  if (path && trailingSlash) {
    path += '/';
  }

  return (isAbsolute ? '/' : '') + path;
};


// posix version
exports.join = function() {
  var paths = Array.prototype.slice.call(arguments, 0);
  return exports.normalize(paths.filter(function(p, index) {
    return p && typeof p === 'string';
  }).join('/'));
};


// path.relative(from, to)
// posix version
exports.relative = function(from, to) {
  from = exports.resolve(from).substr(1);
  to = exports.resolve(to).substr(1);

  function trim(arr) {
    var start = 0;
    for (; start < arr.length; start++) {
      if (arr[start] !== '') break;
    }

    var end = arr.length - 1;
    for (; end >= 0; end--) {
      if (arr[end] !== '') break;
    }

    if (start > end) return [];
    return arr.slice(start, end - start + 1);
  }

  var fromParts = trim(from.split('/'));
  var toParts = trim(to.split('/'));

  var length = Math.min(fromParts.length, toParts.length);
  var samePartsLength = length;
  for (var i = 0; i < length; i++) {
    if (fromParts[i] !== toParts[i]) {
      samePartsLength = i;
      break;
    }
  }

  var outputParts = [];
  for (var i = samePartsLength; i < fromParts.length; i++) {
    outputParts.push('..');
  }

  outputParts = outputParts.concat(toParts.slice(samePartsLength));

  return outputParts.join('/');
};


exports.dirname = function(path) {
  var dir = splitPathRe.exec(path)[1] || '';
  if (!dir) {
    // No dirname
    return '.';
  } else if (dir.length === 1 ||
      (isWindows && dir.length <= 3 && dir.charAt(1) === ':')) {
    // It is just a slash or a drive letter with a slash
    return dir;
  } else {
    // It is a full dirname, strip trailing slash
    return dir.substring(0, dir.length - 1);
  }
};


exports.basename = function(path, ext) {
  var f = splitPathRe.exec(path)[2] || '';
  // TODO: make this comparison case-insensitive on windows?
  if (ext && f.substr(-1 * ext.length) === ext) {
    f = f.substr(0, f.length - ext.length);
  }
  return f;
};


exports.extname = function(path) {
  return splitPathRe.exec(path)[3] || '';
};


});// module: path.js


require.register("colors.js", function(module, exports, require){


/*!
 * Stylus - colors
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

module.exports = {
    aliceblue: [240, 248, 255]
  , antiquewhite: [250, 235, 215]
  , aqua: [0, 255, 255]
  , aquamarine: [127, 255, 212]
  , azure: [240, 255, 255]
  , beige: [245, 245, 220]
  , bisque: [255, 228, 196]
  , black: [0, 0, 0]
  , blanchedalmond: [255, 235, 205]
  , blue: [0, 0, 255]
  , blueviolet: [138, 43, 226]
  , brown: [165, 42, 42]
  , burlywood: [222, 184, 135]
  , cadetblue: [95, 158, 160]
  , chartreuse: [127, 255, 0]
  , chocolate: [210, 105, 30]
  , coral: [255, 127, 80]
  , cornflowerblue: [100, 149, 237]
  , cornsilk: [255, 248, 220]
  , crimson: [220, 20, 60]
  , cyan: [0, 255, 255]
  , darkblue: [0, 0, 139]
  , darkcyan: [0, 139, 139]
  , darkgoldenrod: [184, 132, 11]
  , darkgray: [169, 169, 169]
  , darkgreen: [0, 100, 0]
  , darkgrey: [169, 169, 169]
  , darkkhaki: [189, 183, 107]
  , darkmagenta: [139, 0, 139]
  , darkolivegreen: [85, 107, 47]
  , darkorange: [255, 140, 0]
  , darkorchid: [153, 50, 204]
  , darkred: [139, 0, 0]
  , darksalmon: [233, 150, 122]
  , darkseagreen: [143, 188, 143]
  , darkslateblue: [72, 61, 139]
  , darkslategray: [47, 79, 79]
  , darkslategrey: [47, 79, 79]
  , darkturquoise: [0, 206, 209]
  , darkviolet: [148, 0, 211]
  , deeppink: [255, 20, 147]
  , deepskyblue: [0, 191, 255]
  , dimgray: [105, 105, 105]
  , dimgrey: [105, 105, 105]
  , dodgerblue: [30, 144, 255]
  , firebrick: [178, 34, 34]
  , floralwhite: [255, 255, 240]
  , forestgreen: [34, 139, 34]
  , fuchsia: [255, 0, 255]
  , gainsboro: [220, 220, 220]
  , ghostwhite: [248, 248, 255]
  , gold: [255, 215, 0]
  , goldenrod: [218, 165, 32]
  , gray: [128, 128, 128]
  , green: [0, 128, 0]
  , greenyellow: [173, 255, 47]
  , grey: [128, 128, 128]
  , honeydew: [240, 255, 240]
  , hotpink: [255, 105, 180]
  , indianred: [205, 92, 92]
  , indigo: [75, 0, 130]
  , ivory: [255, 255, 240]
  , khaki: [240, 230, 140]
  , lavender: [230, 230, 250]
  , lavenderblush: [255, 240, 245]
  , lawngreen: [124, 252, 0]
  , lemonchiffon: [255, 250, 205]
  , lightblue: [173, 216, 230]
  , lightcoral: [240, 128, 128]
  , lightcyan: [224, 255, 255]
  , lightgoldenrodyellow: [250, 250, 210]
  , lightgray: [211, 211, 211]
  , lightgreen: [144, 238, 144]
  , lightgrey: [211, 211, 211]
  , lightpink: [255, 182, 193]
  , lightsalmon: [255, 160, 122]
  , lightseagreen: [32, 178, 170]
  , lightskyblue: [135, 206, 250]
  , lightslategray: [119, 136, 153]
  , lightslategrey: [119, 136, 153]
  , lightsteelblue: [176, 196, 222]
  , lightyellow: [255, 255, 224]
  , lime: [0, 255, 0]
  , limegreen: [50, 205, 50]
  , linen: [250, 240, 230]
  , magenta: [255, 0, 255]
  , maroon: [128, 0, 0]
  , mediumaquamarine: [102, 205, 170]
  , mediumblue: [0, 0, 205]
  , mediumorchid: [186, 85, 211]
  , mediumpurple: [147, 112, 219]
  , mediumseagreen: [60, 179, 113]
  , mediumslateblue: [123, 104, 238]
  , mediumspringgreen: [0, 250, 154]
  , mediumturquoise: [72, 209, 204]
  , mediumvioletred: [199, 21, 133]
  , midnightblue: [25, 25, 112]
  , mintcream: [245, 255, 250]
  , mistyrose: [255, 228, 225]
  , moccasin: [255, 228, 181]
  , navajowhite: [255, 222, 173]
  , navy: [0, 0, 128]
  , oldlace: [253, 245, 230]
  , olive: [128, 128, 0]
  , olivedrab: [107, 142, 35]
  , orange: [255, 165, 0]
  , orangered: [255, 69, 0]
  , orchid: [218, 112, 214]
  , palegoldenrod: [238, 232, 170]
  , palegreen: [152, 251, 152]
  , paleturquoise: [175, 238, 238]
  , palevioletred: [219, 112, 147]
  , papayawhip: [255, 239, 213]
  , peachpuff: [255, 218, 185]
  , peru: [205, 133, 63]
  , pink: [255, 192, 203]
  , plum: [221, 160, 203]
  , powderblue: [176, 224, 230]
  , purple: [128, 0, 128]
  , red: [255, 0, 0]
  , rosybrown: [188, 143, 143]
  , royalblue: [65, 105, 225]
  , saddlebrown: [139, 69, 19]
  , salmon: [250, 128, 114]
  , sandybrown: [244, 164, 96]
  , seagreen: [46, 139, 87]
  , seashell: [255, 245, 238]
  , sienna: [160, 82, 45]
  , silver: [192, 192, 192]
  , skyblue: [135, 206, 235]
  , slateblue: [106, 90, 205]
  , slategray: [119, 128, 144]
  , slategrey: [119, 128, 144]
  , snow: [255, 255, 250]
  , springgreen: [0, 255, 127]
  , steelblue: [70, 130, 180]
  , tan: [210, 180, 140]
  , teal: [0, 128, 128]
  , thistle: [216, 191, 216]
  , tomato: [255, 99, 71]
  , turquoise: [64, 224, 208]
  , violet: [238, 130, 238]
  , wheat: [245, 222, 179]
  , white: [255, 255, 255]
  , whitesmoke: [245, 245, 245]
  , yellow: [255, 255, 0]
  , yellowgreen: [154, 205, 5]
};

});// module: colors.js


require.register("errors.js", function(module, exports, require){


/*!
 * Stylus - errors
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Expose constructors.
 */

exports.ParseError = ParseError;
exports.SyntaxError = SyntaxError;

/**
 * Inherit from `Error.prototype`.
 */

SyntaxError.prototype.__proto__ = Error.prototype;

/**
 * Initialize a new `ParseError` with the given `msg`.
 *
 * @param {String} msg
 * @api private
 */

function ParseError(msg) {
  this.name = 'ParseError';
  this.message = msg;
  Error.captureStackTrace(this, ParseError);
}

/**
 * Inherit from `Error.prototype`.
 */

ParseError.prototype.__proto__ = Error.prototype;

/**
 * Initialize a new `SyntaxError` with the given `msg`.
 *
 * @param {String} msg
 * @api private
 */

function SyntaxError(msg) {
  this.name = 'SyntaxError';
  this.message = msg;
  Error.captureStackTrace(this, ParseError);
}

/**
 * Inherit from `Error.prototype`.
 */

SyntaxError.prototype.__proto__ = Error.prototype;



});// module: errors.js


require.register("functions/index.js", function(module, exports, require){


/*!
 * Stylus - Evaluator - built-in functions
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Compiler = require('../visitor/compiler')
  , nodes = require('../nodes')
  , utils = require('../utils')
  , Image = require('./image');

/**
 * Color component name map.
 */

var componentMap = {
    red: 'r'
  , green: 'g'
  , blue: 'b'
  , alpha: 'a'
  , hue: 'h'
  , saturation: 's'
  , lightness: 'l'
};

/**
 * Color component unit type map.
 */

var unitMap = {
    hue: 'deg'
  , saturation: '%'
  , lightness: '%'
};

/**
 * Color type map.
 */

var typeMap = {
    red: 'rgba'
  , blue: 'rgba'
  , green: 'rgba'
  , alpha: 'rgba'
  , hue: 'hsla'
  , saturation: 'hsla'
  , lightness: 'hsla'
};

/**
 * Convert the given `color` to an `HSLA` node,
 * or h,s,l,a component values.
 *
 * Examples:
 *
 *    hsla(10deg, 50%, 30%, 0.5)
 *    // => HSLA
 *
 *    hsla(#ffcc00)
 *    // => HSLA
 *
 * @param {RGBA|HSLA|Unit} hue
 * @param {Unit} saturation
 * @param {Unit} lightness
 * @param {Unit} alpha
 * @return {HSLA}
 * @api public
 */

exports.hsla = function hsla(hue, saturation, lightness, alpha){
  switch (arguments.length) {
    case 1:
      utils.assertColor(hue);
      return hue.hsla;
    default:
      utils.assertType(hue, 'unit', 'hue');
      utils.assertType(saturation, 'unit', 'saturation');
      utils.assertType(lightness, 'unit', 'lightness');
      utils.assertType(alpha, 'unit', 'alpha');
      return new nodes.HSLA(
          hue.val
        , saturation.val
        , lightness.val
        , alpha.val);
  }
};

/**
 * Convert the given `color` to an `HSLA` node,
 * or h,s,l component values.
 *
 * Examples:
 *
 *    hsl(10, 50, 30)
 *    // => HSLA
 *
 *    hsl(#ffcc00)
 *    // => HSLA
 *
 * @param {Unit|HSLA|RGBA} hue
 * @param {Unit} saturation
 * @param {Unit} lightness
 * @return {HSLA}
 * @api public
 */

exports.hsl = function hsl(hue, saturation, lightness){
  if (1 == arguments.length) {
    utils.assertColor(hue, 'color');
    return hue.hsla;
  } else {
    return exports.hsla(
        hue
      , saturation
      , lightness
      , new nodes.Unit(1));
  }
};

/**
 * Return type of `node`.
 *
 * Examples:
 * 
 *    type(12)
 *    // => 'unit'
 *
 *    type(#fff)
 *    // => 'color'
 *
 *    type(type)
 *    // => 'function'
 *
 *    type(unbound)
 *    typeof(unbound)
 *    type-of(unbound)
 *    // => 'ident'
 *
 * @param {Node} node
 * @return {String}
 * @api public
 */

exports.type =
exports['typeof'] =
exports['type-of'] = function type(node){
  utils.assertPresent(node, 'expression');
  var type = node.nodeName;
  return new nodes.String(type);
};

/**
 * Return component `name` for the given `color`.
 *
 * @param {RGBA|HSLA} color
 * @param {String} na,e
 * @return {Unit}
 * @api public
 */

exports.component = function component(color, name) {
  utils.assertColor(color, 'color');
  utils.assertString(name, 'name');
  var name = name.string
    , unit = unitMap[name]
    , type = typeMap[name]
    , name = componentMap[name];
  if (!name) throw new Error('invalid color component "' + name + '"');
  return new nodes.Unit(color[type][name], unit);
};

/**
 * Return the red component of the given `color`.
 *
 * Examples:
 *
 *    red(#c00)
 *    // => 204
 *
 * @param {RGBA|HSLA} color
 * @return {Unit}
 * @api public
 */

exports.red = function red(color){
  return exports.component(color, new nodes.String('red'));
};

/**
 * Return the green component of the given `color`.
 *
 * Examples:
 *
 *    green(#0c0)
 *    // => 204
 *
 * @param {RGBA|HSLA} color
 * @return {Unit}
 * @api public
 */

exports.green = function green(color){
  return exports.component(color, new nodes.String('green'));
};

/**
 * Return the blue component of the given `color`.
 *
 * Examples:
 *
 *    blue(#00c)
 *    // => 204
 *
 * @param {RGBA|HSLA} color
 * @return {Unit}
 * @api public
 */

exports.blue = function blue(color){
  return exports.component(color, new nodes.String('blue'));
};

/**
 * Return a `RGBA` from the r,g,b,a channels.
 *
 * Examples:
 *
 *    rgba(255,0,0,0.5)
 *    // => rgba(255,0,0,0.5)
 *
 *    rgba(255,0,0,1)
 *    // => #ff0000
 *
 *    rgba(#ffcc00, 0.5)
 *    // rgba(255,204,0,0.5)
 *
 * @param {Unit|RGBA|HSLA} red
 * @param {Unit} green
 * @param {Unit} blue
 * @param {Unit} alpha
 * @return {RGBA}
 * @api public
 */

exports.rgba = function rgba(red, green, blue, alpha){
  switch (arguments.length) {
    case 1:
      utils.assertColor(red);
      var color = red.rgba;
      return new nodes.RGBA(
          color.r
        , color.g
        , color.b
        , color.a);
    case 2:
      utils.assertColor(red);
      var color = red.rgba;
      utils.assertType(green, 'unit', 'alpha');
      return new nodes.RGBA(
          color.r
        , color.g
        , color.b
        , green.val);
    default:
      utils.assertType(red, 'unit', 'red');
      utils.assertType(green, 'unit', 'green');
      utils.assertType(blue, 'unit', 'blue');
      utils.assertType(alpha, 'unit', 'alpha');
      return new nodes.RGBA(
          red.val
        , green.val
        , blue.val
        , alpha.val);
  }
};

/**
 * Return a `RGBA` from the r,g,b channels.
 *
 * Examples:
 *
 *    rgb(255,204,0)
 *    // => #ffcc00
 *
 *    rgb(#fff)
 *    // => #fff
 *
 * @param {Unit|RGBA|HSLA} red
 * @param {Unit} green
 * @param {Unit} blue
 * @return {RGBA}
 * @api public
 */

exports.rgb = function rgb(red, green, blue){
  switch (arguments.length) {
    case 1:
      utils.assertColor(red);
      var color = red.rgba;
      return new nodes.RGBA(
          color.r
        , color.g
        , color.b
        , 1);
    default:
      return exports.rgba(
          red
        , green
        , blue
        , new nodes.Unit(1));
  }
};

/**
 * Unquote the given `str`.
 *
 * Examples:
 *
 *    unquote("sans-serif")
 *    // => sans-serif
 *
 *    unquote(sans-serif)
 *    // => sans-serif
 *
 * @param {String|Ident} string
 * @return {Literal}
 * @api public
 */

exports.unquote = function unquote(string){
  utils.assertString(string, 'string');
  return new nodes.Literal(string.string);
};

/**
 * Assign `type` to the given `unit` or return `unit`'s type.
 *
 * @param {Unit} unit
 * @param {String|Ident} type
 * @return {Unit}
 * @api public
 */

exports.unit = function unit(unit, type){
  utils.assertType(unit, 'unit', 'unit');

  // Assign
  if (type) {
    utils.assertString(type, 'type');
    return new nodes.Unit(unit.val, type.string);
  } else {
    return new nodes.String(unit.type || '');
  }
};

/**
 * Lookup variable `name` or return Null.
 *
 * @param {String} name
 * @return {Mixed}
 * @api public
 */

exports.lookup = function lookup(name){
  utils.assertType(name, 'string', 'name');
  var node = this.lookup(name.val);
  if (!node) return nodes.nil;
  return this.visit(node);
};

/**
 * Perform `op` on the `left` and `right` operands.
 *
 * @param {String} op
 * @param {Node} left
 * @param {Node} right
 * @return {Node}
 * @api public
 */

exports.operate = function operate(op, left, right){
  utils.assertType(op, 'string', 'op');
  utils.assertPresent(left, 'left');
  utils.assertPresent(right, 'right');
  return left.operate(op.val, right);
};

/**
 * Test if `val` matches the given `pattern`.
 *
 * Examples:
 *
 *     match('^foo(bar)?', foo)
 *     match('^foo(bar)?', foobar)
 *     match('^foo(bar)?', 'foo')
 *     match('^foo(bar)?', 'foobar')
 *     // => true
 *
 *     match('^foo(bar)?', 'bar')
 *     // => false
 *
 * @param {String} pattern
 * @param {String|Ident} val
 * @return {Boolean}
 * @api public
 */

exports.match = function match(pattern, val){
  utils.assertType(pattern, 'string', 'pattern');
  utils.assertString(val, 'val');
  var re = new RegExp(pattern.val);
  return nodes.Boolean(re.test(val.string));
};

/**
 * Return length of the given `expr`.
 *
 * @param {Expression} expr
 * @return {Unit}
 * @api public
 */

(exports.length = function length(expr){
  if (expr) {
    if (expr.nodes) {
      return new nodes.Unit(utils.unwrap(expr).nodes.length);
    } else {
      return new nodes.Unit(1);
    }
  }
  return new nodes.Unit(0);
}).raw = true;

/**
 * Inspect the given `expr`.
 *
 * @param {Expression} expr
 * @api public
 */

(exports.p = function p(expr){
  expr = utils.unwrap(expr);
  console.log('\033[90minspect:\033[0m undefined'
    , expr.toString().replace(/^\(|\)$/g, ''));
  return nodes.nil;
}).raw = true;

/**
 * Throw an error with the given `msg`.
 *
 * @param {String} msg
 * @api public
 */

exports.error = function error(msg){
  utils.assertType(msg, 'string', 'msg');
  throw new Error(msg.val);
};

/**
 * Warn with the given `msg` prefixed by "Warning: ".
 *
 * @param {String} msg
 * @api public
 */

exports.warn = function warn(msg){
  utils.assertType(msg, 'string', 'msg');
  console.warn('Warning: undefined', msg.val);
  return nodes.nil;
};

/**
 * Output stack trace.
 *
 * @api public
 */

exports.trace = function trace(){
  console.log(this.stack);
  return nodes.nil;
};

/**
 * Push the given args to `expr`.
 *
 * @param {Expression} expr
 * @param {Node} ...
 * @return {Unit}
 * @api public
 */

(exports.push = exports.append = function(expr){
  expr = utils.unwrap(expr);
  for (var i = 1, len = arguments.length; i < len; ++i) {
    expr.nodes.push(utils.unwrap(arguments[i]));
  }
  return new nodes.Unit(expr.nodes.length);
}).raw = true;

/**
 * Unshift the given args to `expr`.
 *
 * @param {Expression} expr
 * @param {Node} ...
 * @return {Unit}
 * @api public
 */

(exports.unshift = exports.prepend = function(expr){
  expr = utils.unwrap(expr);
  for (var i = 1, len = arguments.length; i < len; ++i) {
    expr.nodes.unshift(utils.unwrap(arguments[i]));
  }
  return new nodes.Unit(expr.nodes.length);
}).raw = true;

/**
 * Return a `Literal` with the given `fmt`, and
 * variable number of arguments.
 *
 * @param {String} fmt
 * @param {Node} ...
 * @return {Literal}
 * @api public
 */

(exports.s = function s(fmt){
  fmt = utils.unwrap(fmt).nodes[0];
  utils.assertString(fmt);
  var self = this
    , str = fmt.string
    , args = arguments
    , i = 1;

  // format
  str = str.replace(/%(s|d)/g, function(_, specifier){
    var arg = args[i++] || nodes.nil;
    switch (specifier) {
      case 's':
        return new Compiler(arg, self.options).compile();
      case 'd':
        arg = utils.unwrap(arg).first;
        if ('unit' != arg.nodeName) throw new Error('NaN requires a unit');
        return arg.val;
    }
  });

  return new nodes.Literal(str);
}).raw = true;

/**
 * Return the opposites of the given `positions`.
 *
 * Examples:
 *
 *    opposite-position(top left)
 *    // => bottom right
 *
 * @param {Expression} positions
 * @return {Expression}
 * @api public
 */

(exports['opposite-position'] = function oppositePosition(positions){
  var expr = new nodes.Expression;
  utils.unwrap(positions).nodes.forEach(function(pos, i){
    utils.assertString(pos, 'position ' + i);
    pos = (function(){ switch (pos.string) {
      case 'top': return 'bottom';
      case 'bottom': return 'top';
      case 'left': return 'right';
      case 'right': return 'left';
      default: throw new Error('invalid position ' + pos);
    }})();
    expr.push(new nodes.Literal(pos));
  });
  return expr;
}).raw = true;

/**
 * Return the width and height of the given `img` path.
 *
 * Examples:
 *
 *    image-size('foo.png')
 *    // => 200px 100px
 *
 *    image-size('foo.png')[0]
 *    // => 200px
 *
 *    image-size('foo.png')[1]
 *    // => 100px
 *
 * @param {String} img
 * @return {Expression}
 * @api public
 */

exports['image-size'] = function imageSize(img) {
  utils.assertType(img, 'string', 'img');
  var img = new Image(this, img.string);

  // Read size
  img.open();
  var size = img.size();
  img.close();

  // Return (w h)
  var expr = new nodes.Expression;
  expr.push(new nodes.Unit(size[0], 'px'));
  expr.push(new nodes.Unit(size[1], 'px'));

  return expr;
};

/**
 * Apply Math `fn` to `n`.
 *
 * @param {Unit} n
 * @param {String} fn
 * @return {Unit}
 * @api private
 */

exports['-math'] = function math(n, fn){
  return new nodes.Unit(Math[fn.string](n.val), n.type);
};

/**
 * Get Math `prop`.
 *
 * @param {String} prop
 * @return {Unit}
 * @api private
 */

exports['-math-prop'] = function math(prop){
  return new nodes.Unit(Math[prop.string]);
};

/**
 * Buffer the given js `str`.
 *
 * @param {String} str
 * @return {JSLiteral}
 * @api private
 */

exports.js = function js(str){
  utils.assertString(str, 'str');
  return new nodes.JSLiteral(str.val);
};

/**
 * Adjust HSL `color` `prop` by `amount`.
 *
 * @param {RGBA|HSLA} color
 * @param {String} prop
 * @param {Unit} amount
 * @return {RGBA}
 * @api private
 */

exports['-adjust'] = function adjust(color, prop, amount){
  var hsl = color.hsla.clone();
  prop = { hue: 'h', saturation: 's', lightness: 'l' }[prop.string];
  if (!prop) throw new Error('invalid adjustment property');
  var val = amount.val;
  if ('%' == amount.type){
    val = 'l' == prop && val > 0
      ? (100 - hsl[prop]) * val / 100
      : hsl[prop] * (val / 100);
  }
  hsl[prop] += val;
  return hsl.rgba;
};

/**
 * Return a clone of the given `expr`.
 *
 * @param {Expression} expr
 * @return {Node}
 * @api public
 */

(exports.clone = function clone(expr){
  utils.assertPresent(expr, 'expr');
  return expr.clone();
}).raw = true;

/**
 * Add property `name` with the given `expr`
 * to the mixin-able block.
 *
 * @param {String|Ident|Literal} name
 * @param {Expression} expr
 * @return {Property}
 * @api public
 */

(exports['add-property'] = function addProperty(name, expr){
  utils.assertType(name, 'expression', 'name');
  name = utils.unwrap(name).first;
  utils.assertString(name, 'name');
  utils.assertType(expr, 'expression', 'expr');
  var prop = new nodes.Property([name], expr);
  var block = this.closestBlock;

  var len = block.nodes.length
    , head = block.nodes.slice(0, block.index)
    , tail = block.nodes.slice(block.index++, len);
  head.push(prop);
  block.nodes = head.concat(tail);
  
  return prop;
}).raw = true;


});// module: functions/index.js


require.register("functions/image.js", function(module, exports, require){



/*!
 * Stylus - plugin - url
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var utils = require('../utils')
  , nodes = require('../nodes');

/**
 * Initialize a new `Image` with the given `ctx` and `path.
 *
 * @param {Evaluator} ctx
 * @param {String} path
 * @api private
 */

var Image = module.exports = function Image(ctx, path) {
  this.ctx = ctx;
  this.path = utils.lookup(path, ctx.paths);
  if (!this.path) throw new Error('failed to locate file ' + path);
};

/**
 * Open the image for reading.
 *
 * @api private
 */

Image.prototype.open = function(){
  this.fd = fs.openSync(this.path, 'r');
};

/**
 * Close the file.
 *
 * @api private
 */

Image.prototype.close = function(){
  if (this.fd) fs.closeSync(this.fd);
};

/**
 * Return the type of image, supports:
 *
 *  - gif
 *  - png
 *  - jpeg
 *
 * @return {String}
 * @api private
 */

Image.prototype.type = function(){
  var type
    , buf = new Buffer(4);
  
  fs.readSync(this.fd, buf, 0, 4, 0);

  // GIF
  if (0x47 == buf[0] && 0x49 == buf[1] && 0x46 == buf[2]) type = 'gif';

  // PNG
  else if (0x50 == buf[1] && 0x4E == buf[2] && 0x47 == buf[3]) type = 'png';

  // JPEG
  else if (0xff == buf[0] && 0xd8 == buf[1]) type = 'jpeg';

  return type;
};

/**
 * Return image dimensions `[width, height]`.
 *
 * @return {Array}
 * @api private
 */

Image.prototype.size = function(){
  var width
    , height
    , type = this.type();

  function uint16(b) { return b[1] << 8 | b[0]; }
  function uint32(b) { return b[0] << 24 | b[1] << 16 | b[2] << 8 | b[3]; } 

  // Determine dimensions
  switch (type) {
    case 'jpeg':
      throw new Error('image-size() jpeg support not yet implemented');
      break;
    case 'png':
      var buf = new Buffer(8);
      // IHDR chunk width / height uint32_t big-endian
      fs.readSync(this.fd, buf, 0, 8, 16);
      width = uint32(buf);
      height = uint32(buf.slice(4, 8));
      break;
    case 'gif':
      var buf = new Buffer(4);
      // width / height uint16_t little-endian
      fs.readSync(this.fd, buf, 0, 4, 6);
      width = uint16(buf);
      height = uint16(buf.slice(2, 4));
      break;
  }

  if ('number' != typeof width) throw new Error('failed to find width of "' + this.path + '"');
  if ('number' != typeof height) throw new Error('failed to find height of "' + this.path + '"');

  return [width, height];
};

});// module: functions/image.js


require.register("functions/url.js", function(module, exports, require){


/*!
 * Stylus - plugin - url
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Compiler = require('../visitor/compiler')
  , nodes = require('../nodes')
  // , parse = require('url').parse
  , extname = require('../path').extname
  , utils = require('../utils')
  // , fs = require('fs');

/**
 * Mime table.
 */

var mimes = {
    '.gif': 'image/gif'
  , '.png': 'image/png'
  , '.jpg': 'image/jpeg'
  , '.jpeg': 'image/jpeg'
  , '.svg': 'image/svg+xml'
};

/**
 * Return a url() function with the given `options`.
 *
 * Options:
 *
 *    - `limit` bytesize limit defaulting to 30Kb
 *    - `paths` image resolution path(s), merged with general lookup paths
 *
 * Examples:
 *
 *    stylus(str)
 *      .set('filename', __dirname + '/css/test.styl')
 *      .define('url', stylus.url({ paths: [__dirname + '/public'] }))
 *      .render(function(err, css){ ... })
 *
 * @param {Object} options
 * @return {Function}
 * @api public
 */

module.exports = function(options) {
  options = options || {};

  var sizeLimit = options.limit || 30000
    , _paths = options.paths || [];

  function url(url){
    // Compile the url
    var compiler = new Compiler(url);
    compiler.isURL = true;
    var url = url.nodes.map(function(node){
      return compiler.visit(node);
    }).join('');

    // Parse literal 
    var url = parse(url)
      , ext = extname(url.pathname)
      , mime = mimes[ext]
      , literal = new nodes.Literal('url("' + url.href + '")')
      , paths = _paths.concat(this.paths)
      , founds
      , buf;

    // Not supported
    if (!mime) return literal;

    // Absolute
    if (url.protocol) return literal;

    // Lookup
    found = utils.lookup(url.pathname, paths);

    // Failed to lookup
    if (!found) return literal;

    // Read data
    buf = fs.readFileSync(found);

    // To large
    if (buf.length > sizeLimit) return literal;

    // Encode
    return new nodes.Literal('url("data:' + mime + ';base64,' + buf.toString('base64') + '")');
  };

  url.raw = true;
  return url;
};

});// module: functions/url.js


require.register("lexer.js", function(module, exports, require){


/*!
 * Stylus - Lexer
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Token = require('./token')
  , nodes = require('./nodes')
  , errors = require('./errors');

/**
 * Operator aliases.
 */

var alias = {
    'and': '&&'
  , 'or': '||'
  , 'is': '=='
  , 'isnt': '!='
  , 'is not': '!='
  , ':=': '?='
};

/**
 * Units.
 */

var units = [
    'em'
  , 'ex'
  , 'px'
  , 'mm'
  , 'cm'
  , 'in'
  , 'pt'
  , 'pc'
  , 'deg'
  , 'rad'
  , 'grad'
  , 'ms'
  , 's'
  , 'Hz'
  , 'kHz'
  , 'rem'
  , '%'].join('|');

/**
 * Unit RegExp.
 */

var unit = new RegExp('^(-)?(\\d+\\.\\d+|\\d+|\\.\\d+)(' + units + ')? *');

/**
 * Initialize a new `Lexer` with the given `str` and `options`.
 *
 * @param {String} str
 * @param {Object} options
 * @api private
 */

var Lexer = module.exports = function Lexer(str, options) {
  options = options || {};
  this.str = str.replace(/\r\n?/g, '\n');
  this.stash = [];
  this.indentStack = [];
  this.indentRe = null;
  this.lineno = 1;
};

/**
 * Lexer prototype.
 */

Lexer.prototype = {
  
  /**
   * Custom inspect.
   */
  
  inspect: function(){
    var tok
      , tmp = this.str
      , buf = [];
    while ('eos' != (tok = this.next()).type) {
      buf.push(tok.inspect());
    }
    this.str = tmp;
    this.prevIndents = 0;
    return buf.concat(tok.inspect()).join('\n');
  },

  /**
   * Lookahead `n` tokens.
   *
   * @param {Number} n
   * @return {Object}
   * @api private
   */
  
  lookahead: function(n){
    var fetch = n - this.stash.length;
    while (fetch-- > 0) this.stash.push(this.advance());
    return this.stash[--n];
  },
  
  /**
   * Consume the given `len`.
   *
   * @param {Number|Array} len
   * @api private
   */

  skip: function(len){
    this.str = this.str.substr(Array.isArray(len)
      ? len[0].length
      : len);
  },

  /**
   * Fetch next token including those stashed by peek.
   *
   * @return {Token}
   * @api private
   */

  next: function() {
    var tok = this.stashed() || this.advance();
    switch (tok.type) {
      case 'newline':
      case 'indent':
        ++this.lineno;
        break;
      case 'outdent':
        if ('outdent' != this.prev.type) ++this.lineno;
    }
    this.prev = tok;
    tok.lineno = this.lineno;
    return tok;
  },

  /**
   * Fetch next token.
   *
   * @return {Token}
   * @api private
   */

  advance: function() {
    return this.eos()
      || this.nil()
      || this.sep()
      || this.keyword()
      || this.urlchars()
      || this.atrule()
      || this.scope()
      || this.media()
      || this.comment()
      || this.newline()
      || this.escaped()
      || this.important()
      || this.literal()
      || this.fun()
      || this.brace()
      || this.paren()
      || this.color()
      || this.string()
      || this.unit()
      || this.namedop()
      || this.boolean()
      || this.ident()
      || this.op()
      || this.space()
      || this.selector();
  },

  /**
   * Lookahead a single token.
   *
   * @return {Token}
   * @api private
   */
  
  peek: function() {
    return this.lookahead(1);
  },
  
  /**
   * Return the next possibly stashed token.
   *
   * @return {Token}
   * @api private
   */

  stashed: function() {
    return this.stash.shift();
  },

  /**
   * EOS | trailing outdents.
   */

  eos: function() {
    if (this.str.length) return;
    if (this.indentStack.length) {
      this.indentStack.shift();
      return new Token('outdent');
    } else {
      return new Token('eos');
    }
  },

  /**
   * url char
   */

  urlchars: function() {
    var captures;
    if (!this.isURL) return;
    if (captures = /^[\/:@.;?&=*!,<>#%0-9]+/.exec(this.str)) {
      this.skip(captures);
      return new Token('literal', new nodes.Literal(captures[0]));
    }
  },

  /**
   * ';' ' '*
   */

  sep: function() {
    var captures;
    if (captures = /^; */.exec(this.str)) {
      this.skip(captures);
      return new Token(';');
    }
  },
  
  /**
   * ' '+
   */

  space: function() {
    var captures;
    if (captures = /^( +)/.exec(this.str)) {
      this.skip(captures);
      return new Token('space');
    }
  },
  
  /**
   * '\\' . ' '*
   */
   
  escaped: function() {
    var captures;
    if (captures = /^\\(.) */.exec(this.str)) {
      var c = captures[1];
      this.skip(captures);
      return new Token('ident', new nodes.Literal(c));
    }
  },
  
  /**
   * '@css' ' '* '{' .* '}' ' '*
   */
  
  literal: function() {
    // HACK attack !!!
    var captures;
    if (captures = /^@css *\{/.exec(this.str)) {
      this.skip(captures);
      var c
        , braces = 1
        , css = '';
      while (c = this.str[0]) {
        this.str = this.str.substr(1);
        switch (c) {
          case '{': ++braces; break;
          case '}': --braces; break;
        }
        css += c;
        if (!braces) break;
      }
      css = css.replace(/\s*}$/, '');
      return new Token('literal', new nodes.Literal(css));
    }
  },
  
  /**
   * '!important' ' '*
   */
  
  important: function() {
    var captures;
    if (captures = /^!important */.exec(this.str)) {
      this.skip(captures);
      return new Token('ident', new nodes.Literal('!important'));
    }
  },
  
  /**
   * '{' | '}'
   */
  
  brace: function() {
    var captures;
    if (captures = /^([{}])/.exec(this.str)) {
      this.skip(1);
      var brace = captures[1];
      return new Token(brace, brace);
    }
  },
  
  /**
   * '(' | ')' ' '*
   */
  
  paren: function() {
    var captures;
    if (captures = /^([()]) */.exec(this.str)) {
      var paren = captures[1];
      this.skip(captures);
      if (')' == paren) this.isURL = false;
      return new Token(paren, paren);
    }
  },
  
  /**
   * 'null'
   */
  
  nil: function() {
    var captures;
    if (captures = /^(null)\b */.exec(this.str)) {
      this.skip(captures);
      return new Token('null', nodes.nil);
    }
  },
  
  /**
   *   'if'
   * | 'else'
   * | 'unless'
   * | 'return'
   * | 'for'
   * | 'in'
   */
  
  keyword: function() {
    var captures;
    if (captures = /^(return|if|else|unless|for|in)\b */.exec(this.str)) {
      var keyword = captures[1];
      this.skip(captures);
      return new Token(keyword, keyword);
    }
  },
  
  /**
   *   'not'
   * | 'and'
   * | 'or'
   * | 'is'
   * | 'is not'
   * | 'isnt'
   * | 'is a'
   * | 'is defined'
   */
  
  namedop: function() {
    var captures;
    if (captures = /^(not|and|or|is a|is defined|isnt|is not|is)\b( *)/.exec(this.str)) {
      var op = captures[1];
      this.skip(captures);
      op = alias[op] || op;
      var tok = new Token(op, op);
      tok.space = captures[2];
      return tok;
    }
  },
  
  /**
   *   ','
   * | '+'
   * | '+='
   * | '-'
   * | '-='
   * | '*'
   * | '*='
   * | '/'
   * | '/='
   * | '%'
   * | '%='
   * | '**'
   * | '!'
   * | '&'
   * | '&&'
   * | '||'
   * | '>'
   * | '>='
   * | '<'
   * | '<='
   * | '='
   * | '=='
   * | '!='
   * | '!'
   * | '~'
   * | '?='
   * | ':='
   * | '?'
   * | ':'
   * | '['
   * | ']'
   * | '..'
   * | '...'
   */
  
  op: function() {
    var captures;
    if (captures = /^([.]{2,3}|&&|\|\||[!<>=?:]=|\*\*|[-+*\/%]=?|[,=?:!~<>&\[\]])( *)/.exec(this.str)) {
      var op = captures[1];
      this.skip(captures);
      op = alias[op] || op;
      var tok = new Token(op, op);
      tok.space = captures[2];
      return tok;
    }
  },

  /**
   * '@media' ([^{\n]+)
   */
  
  media: function() {
    var captures;
    if (captures = /^@media *([^\/{\n]+)/.exec(this.str)) {
      this.skip(captures);
      return new Token('media', captures[1].trim());
    }
  },

  /**
   * '@scope' ([^{\n]+)
   */
  
  scope: function() {
    var captures;
    if (captures = /^@scope *([^\/{\n]+)/.exec(this.str)) {
      this.skip(captures);
      return new Token('scope', captures[1].trim());
    }
  },

  /**
   * '@' ('import' | 'keyframes' | 'charset' | 'page' | 'font-face')
   */
  
  atrule: function() {
    var captures;
    if (captures = /^@(import|(?:-(\w+)-)?keyframes|charset|font-face|page) */.exec(this.str)) {
      this.skip(captures);
      var vendor = captures[2]
        , type = captures[1];
      if (vendor) type = 'keyframes';
      return new Token(type, vendor);
    }
  },

  /**
   * '//' *
   */
  
  comment: function() {
    // Single line
    if ('/' == this.str[0] && '/' == this.str[1]) {
      var end = this.str.indexOf('\n');
      if (-1 == end) end = this.str.length;
      this.skip(end);
      return this.advance();
    }

    // Multi-line
    if ('/' == this.str[0] && '*' == this.str[1]) {
      var end = this.str.indexOf('*/');
      if (-1 == end) end = this.str.length;
      var str = this.str.substr(0, end + 2)
        , lines = str.split('\n').length - 1
        , suppress = true;
      this.lineno += lines;
      this.skip(end + 2);
      // output
      if ('!' == str[2]) {
        str = str.replace('*!', '*');
        suppress = false;
      }
      return new Token('comment', new nodes.Comment(str, suppress));
    }
  },

  /**
   * 'true' | 'false'
   */
  
  boolean: function() {
    var captures;
    if (captures = /^(true|false)\b( *)/.exec(this.str)) {
      var val = nodes.Boolean('true' == captures[1]);
      this.skip(captures);
      var tok = new Token('boolean', val);
      tok.space = captures[2];
      return tok;
    }
  },

  /**
   * -?[a-zA-Z$] [-\w\d$]* '('
   */
  
  fun: function() {
    var captures;
    if (captures = /^(-?[a-zA-Z$][-\w\d$]*)\(( *)/.exec(this.str)) {
      var name = captures[1];
      this.skip(captures);
      this.isURL = 'url' == name;
      var tok = new Token('function', new nodes.Ident(name));
      tok.space = captures[2];
      return tok;
    } 
  },

  /**
   * -?[_a-zA-Z$] [-\w\d$]*
   */
  
  ident: function() {
    var captures;
    if (captures = /^(@)?(-?[_a-zA-Z$][-\w\d$]*)/.exec(this.str)) {
      var at = captures[1]
        , name = captures[2]
        , id = new nodes.Ident(name);
      this.skip(captures);
      id.property = !! at;
      return new Token('ident', id);
    }
  },
  
  /**
   * '\n' ' '+
   */

  newline: function() {
    var captures, re;

    // we have established the indentation regexp
    if (this.indentRe){
      captures = this.indentRe.exec(this.str);
    // figure out if we are using tabs or spaces
    } else {
      // try tabs
      re = /^\n([\t]*) */;
      captures = re.exec(this.str);

      // nope, try spaces
      if (captures && !captures[1].length) {
        re = /^\n( *)/;
        captures = re.exec(this.str);
      }

      // established
      if (captures && captures[1].length) this.indentRe = re;
    }


    if (captures) {
      var tok
        , indents = captures[1].length;

      this.skip(captures);
      if (this.str[0] === ' ' || this.str[0] === '\t') {
        throw new errors.SyntaxError('Invalid indentation. You can use tabs or spaces to indent, but not both.');
      }

      // Reset state
      this.isVariable = false;

      // Blank line
      if ('\n' == this.str[0]) {
        ++this.lineno;
        return this.advance();
      }

      // Outdent
      if (this.indentStack.length && indents < this.indentStack[0]) {
        while (this.indentStack.length && this.indentStack[0] > indents) {
          this.stash.push(new Token('outdent'));
          this.indentStack.shift();
        }
        tok = this.stash.pop();
      // Indent
      } else if (indents && indents != this.indentStack[0]) {
        this.indentStack.unshift(indents);
        tok = new Token('indent');
      // Newline
      } else {
        tok = new Token('newline');
      }

      return tok;
    }
  },

  /**
   * '-'? (digit+ | digit* '.' digit+) unit
   */

  unit: function() {
    var captures;
    if (captures = unit.exec(this.str)) {
      this.skip(captures);
      var n = parseFloat(captures[2]);
      if ('-' == captures[1]) n = -n;
      var node = new nodes.Unit(n, captures[3]);
      return new Token('unit', node);
    }
  },

  /**
   * '"' [^"]+ '"' | "'"" [^']+ "'"
   */

  string: function() {
    var captures;
    if (captures = /^("[^"]*"|'[^']*') */.exec(this.str)) {
      var str = captures[1];
      this.skip(captures);
      str = str.slice(1,-1).replace(/\\n/g, '\n');
      return new Token('string', new nodes.String(str));
    }
  },

  /**
   * #rrggbbaa | #rrggbb | #rgba | #rgb
   */

  color: function() {
		return this.rrggbbaa()
			|| this.rrggbb()
			|| this.rgba()
			|| this.rgb()
  },
  
  /**
   * #rgb
   */
  
  rgb: function() {
    var captures;
    if (captures = /^#([a-fA-F0-9]{3}) */.exec(this.str)) {
      this.skip(captures);
      var rgb = captures[1]
        , r = parseInt(rgb[0] + rgb[0], 16)
        , g = parseInt(rgb[1] + rgb[1], 16)
        , b = parseInt(rgb[2] + rgb[2], 16)
        , color = new nodes.RGBA(r, g, b, 1);
      color.raw = captures[0];
      return new Token('color', color); 
    }
  },
  
  /**
   * #rgba
   */
  
  rgba: function() {
    var captures;
    if (captures = /^#([a-fA-F0-9]{4}) */.exec(this.str)) {
      this.skip(captures);
      var rgb = captures[1]
        , r = parseInt(rgb[0] + rgb[0], 16)
        , g = parseInt(rgb[1] + rgb[1], 16)
        , b = parseInt(rgb[2] + rgb[2], 16)
        , a = parseInt(rgb[3] + rgb[3], 16)
        , color = new nodes.RGBA(r, g, b, a/255);
      color.raw = captures[0];
      return new Token('color', color); 
    }
  },
  
  /**
   * #rrggbb
   */
  
  rrggbb: function() {
    var captures;
    if (captures = /^#([a-fA-F0-9]{6}) */.exec(this.str)) {
      this.skip(captures);
      var rgb = captures[1]
        , r = parseInt(rgb.substr(0, 2), 16)
        , g = parseInt(rgb.substr(2, 2), 16)
        , b = parseInt(rgb.substr(4, 2), 16)
        , color = new nodes.RGBA(r, g, b, 1);
      color.raw = captures[0];
      return new Token('color', color); 
    }
  },
  
  /**
   * #rrggbbaa
   */
  
  rrggbbaa: function() {
    var captures;
    if (captures = /^#([a-fA-F0-9]{8}) */.exec(this.str)) {
      this.skip(captures);
      var rgb = captures[1]
        , r = parseInt(rgb.substr(0, 2), 16)
        , g = parseInt(rgb.substr(2, 2), 16)
        , b = parseInt(rgb.substr(4, 2), 16)
        , a = parseInt(rgb.substr(6, 2), 16)
        , color = new nodes.RGBA(r, g, b, a/255);
      color.raw = captures[0];
      return new Token('color', color); 
    }
  },
  
  /**
   * [^\n,;]+
   */
  
  selector: function() {
    var captures;
    if (captures = /^[^{\n,]+/.exec(this.str)) {
      var selector = captures[0];
      this.skip(captures);
      return new Token('selector', selector);
    }
  }
};


});// module: lexer.js


require.register("nodes/arguments.js", function(module, exports, require){


/*!
 * Stylus - Arguments
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('../nodes')
  , utils = require('../utils');

/**
 * Initialize a new `Arguments`.
 *
 * @api public
 */

var Arguments = module.exports = function Arguments(){
  nodes.Expression.call(this);
  this.map = {};
};

/**
 * Inherit from `nodes.Expression.prototype`.
 */

Arguments.prototype.__proto__ = nodes.Expression.prototype;

/**
 * Initialize an `Arguments` object with the nodes
 * from the given `expr`.
 *
 * @param {Expression} expr
 * @return {Arguments}
 * @api public
 */

Arguments.fromExpression = function(expr){
  var args = new Arguments
    , len = expr.nodes.length;
  args.lineno = expr.lineno;
  args.isList = expr.isList;
  for (var i = 0; i < len; ++i) {
    args.push(expr.nodes[i]);
  }
  return args;
};

/**
 * Return a clone of this node.
 *
 * @return {Node}
 * @api public
 */

Arguments.prototype.clone = function(){
  var clone = nodes.Expression.prototype.clone.call(this);
  clone.map = this.map;
  return clone;
};



});// module: nodes/arguments.js


require.register("nodes/binop.js", function(module, exports, require){


/*!
 * Stylus - BinOp
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `BinOp` with `op`, `left` and `right`.
 *
 * @param {String} op
 * @param {Node} left
 * @param {Node} right
 * @api public
 */

var BinOp = module.exports = function BinOp(op, left, right){
  Node.call(this);
  this.op = op;
  this.left = left;
  this.right = right;
};

/**
 * Inherit from `Node.prototype`.
 */

BinOp.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

BinOp.prototype.clone = function(){
  var clone = new BinOp(
      this.op
    , this.left.clone()
    , this.right ?
      this.right.clone()
      : null);
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  if (this.val) clone.val = this.val.clone();
  return clone;
};

});// module: nodes/binop.js


require.register("nodes/block.js", function(module, exports, require){


/*!
 * Stylus - Block
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Block` node with `parent` Block.
 *
 * @param {Block} parent
 * @api public
 */

var Block = module.exports = function Block(parent, node){
  Node.call(this);
  this.nodes = [];
  this.parent = parent;
  this.node = node;
  this.scope = true;
};

/**
 * Inherit from `Node.prototype`.
 */

Block.prototype.__proto__ = Node.prototype;

/**
 * Check if this block has properties..
 *
 * @return {Boolean}
 * @api public
 */

Block.prototype.__defineGetter__('hasProperties', function(){
  for (var i = 0, len = this.nodes.length; i < len; ++i) {
    if ('property' == this.nodes[i].nodeName) {
      return true;
    }
  }
});

/**
 * Check if this block is empty.
 *
 * @return {Boolean}
 * @api public
 */

Block.prototype.__defineGetter__('isEmpty', function(){
  return !this.nodes.length;
});

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Block.prototype.clone = function(){
  var clone = new Block(this.parent, this.node);
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  clone.scope = this.scope;
  this.nodes.forEach(function(node){
    node = node.clone();
    switch (node.nodeName) {
      case 'each':
      case 'group':
        node.block.parent = clone;
        break;
      case 'ident':
        if ('function' == node.val.nodeName) {
          node.val.block.parent = clone;
        }
    }
    clone.push(node);
  });
  return clone;
};

/**
 * Push a `node` to this block.
 *
 * @param {Node} node
 * @api public
 */

Block.prototype.push = function(node){
  this.nodes.push(node);
};


});// module: nodes/block.js


require.register("nodes/boolean.js", function(module, exports, require){


/*!
 * Stylus - Boolean
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Boolean` node with the given `val`.
 *
 * @param {Boolean} val
 * @api public
 */

var Boolean = module.exports = function Boolean(val){
  Node.call(this);
  if (this.nodeName) {
    this.val = !!val;
  } else {
    return new Boolean(val);
  }
};

/**
 * Inherit from `Node.prototype`.
 */

Boolean.prototype.__proto__ = Node.prototype;

/**
 * Return `this` node.
 *
 * @return {Boolean}
 * @api public
 */

Boolean.prototype.toBoolean = function(){
  return this;
};

/**
 * Return `true` if this node represents `true`.
 *
 * @return {Boolean}
 * @api public
 */

Boolean.prototype.__defineGetter__('isTrue', function(){
  return this.val;
});

/**
 * Return `true` if this node represents `false`.
 *
 * @return {Boolean}
 * @api public
 */

Boolean.prototype.__defineGetter__('isFalse', function(){
  return ! this.val;
});

/**
 * Negate the value.
 *
 * @return {Boolean}
 * @api public
 */

Boolean.prototype.negate = function(){
  return Boolean(!this.val);
};

/**
 * Return 'Boolean'.
 *
 * @return {String}
 * @api public
 */

Boolean.prototype.inspect = function(){
  return '[Boolean ' + this.val + ']';
};

/**
 * Return 'true' or 'false'.
 *
 * @return {String}
 * @api public
 */

Boolean.prototype.toString = function(){
  return this.val
    ? 'true'
    : 'false';
};

});// module: nodes/boolean.js


require.register("nodes/call.js", function(module, exports, require){


/*!
 * Stylus - Call
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Call` with `name` and `args`.
 *
 * @param {String} name
 * @param {Expression} args
 * @api public
 */

var Call = module.exports = function Call(name, args){
  Node.call(this);
  this.name = name;
  this.args = args;
};

/**
 * Inherit from `Node.prototype`.
 */

Call.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Call.prototype.clone = function(){
  var clone = new Call(this.name, this.args.clone());
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

/**
 * Return <name>().
 *
 * @return {String}
 * @api public
 */

Call.prototype.toString = function(){
  return this.name + '()';
};

});// module: nodes/call.js


require.register("nodes/charset.js", function(module, exports, require){


/*!
 * Stylus - Charset
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Charset` with the given `val`
 *
 * @param {String} val
 * @api public
 */

var Charset = module.exports = function Charset(val){
  Node.call(this);
  this.val = val;
};

/**
 * Inherit from `Node.prototype`.
 */

Charset.prototype.__proto__ = Node.prototype;

/**
 * Return @charset "val".
 *
 * @return {String}
 * @api public
 */

Charset.prototype.toString = function(){
  return '@charset ' + this.val;
};


});// module: nodes/charset.js


require.register("nodes/comment.js", function(module, exports, require){


/*!
 * Stylus - Comment
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Comment` with the given `str`.
 *
 * @param {String} str
 * @param {Boolean} suppress
 * @api public
 */

var Comment = module.exports = function Comment(str, suppress){
  Node.call(this);
  this.str = str;
  this.suppress = suppress;
};

/**
 * Inherit from `Node.prototype`.
 */

Comment.prototype.__proto__ = Node.prototype;


});// module: nodes/comment.js


require.register("nodes/each.js", function(module, exports, require){


/*!
 * Stylus - Each
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Each` node with the given `val` name,
 * `key` name, `expr`, and `block`.
 *
 * @param {String} val
 * @param {String} key
 * @param {Expression} expr
 * @param {Block} block
 * @api public
 */

var Each = module.exports = function Each(val, key, expr, block){
  Node.call(this);
  this.val = val;
  this.key = key;
  this.expr = expr;
  this.block = block;
};

/**
 * Inherit from `Node.prototype`.
 */

Each.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Each.prototype.clone = function(){
  var clone = new Each(
      this.val
    , this.key
    , this.expr.clone()
    , this.block.clone());
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

});// module: nodes/each.js


require.register("nodes/expression.js", function(module, exports, require){


/*!
 * Stylus - Expression
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('../nodes')
  , utils = require('../utils');

/**
 * Initialize a new `Expression`.
 *
 * @param {Boolean} isList
 * @api public
 */

var Expression = module.exports = function Expression(isList){
  Node.call(this);
  this.nodes = [];
  this.isList = isList;
};

/**
 * Check if the variable has a value.
 *
 * @return {Boolean}
 * @api public
 */

Expression.prototype.__defineGetter__('isEmpty', function(){
  return !this.nodes.length;
});

/**
 * Return the first node in this expression.
 *
 * @return {Node}
 * @api public
 */

Expression.prototype.__defineGetter__('first', function(){
  return this.nodes[0]
    ? this.nodes[0].first
    : nodes.nil;
});

/**
 * Hash all the nodes in order.
 *
 * @return {String}
 * @api public
 */

Expression.prototype.__defineGetter__('hash', function(){
  return this.nodes.map(function(node){
    return node.hash;
  }).join('::');
});

/**
 * Inherit from `Node.prototype`.
 */

Expression.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Expression.prototype.clone = function(){
  var clone = new this.constructor(this.isList);
  clone.preserve = this.preserve;
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  for (var i = 0; i < this.nodes.length; ++i) {
    clone.push(this.nodes[i].clone());
  }
  return clone;
};

/**
 * Push the given `node`.
 *
 * @param {Node} node
 * @api public
 */

Expression.prototype.push = function(node){
  this.nodes.push(node);
};

/**
 * Operate on `right` with the given `op`.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

Expression.prototype.operate = function(op, right, val){
  switch (op) {
    case '[]=':
      var self = this
        , range = utils.unwrap(right).nodes
        , val = utils.unwrap(val)
        , len;
      range.forEach(function(unit){
        len = self.nodes.length;
        if ('unit' == unit.nodeName) {
          var i = unit.val;
          while (i-- > len) self.nodes[i] = nodes.nil;
          self.nodes[unit.val] = val;
        }
      });
      return val;
    case '[]':
      var expr = new nodes.Expression
        , vals = utils.unwrap(this).nodes
        , range = utils.unwrap(right).nodes;
      range.forEach(function(unit){
        if ('unit' == unit.nodeName) {
          var node = vals[unit.val];
          if (node) expr.push(node);
        }
      });
      return expr.isEmpty
        ? nodes.nil
        : utils.unwrap(expr);
    case '||':
      // we consider lists with length > 1 truth,
      // for example (0 1 2)
      if (this.nodes.length > 1) return this;

      // check the return value, and return the lhs expr
      // as a whole rather than the first item
      var ret = this.first.operate(op, right, val);
      return ret == this.nodes[0] ? this : right;
    case 'in':
      return Node.prototype.operate.call(this, op, right);
    case '!=':
      return this.operate('==', right, val).negate();
    case '==':
      var len = this.nodes.length
        , right = right.toExpression()
        , a
        , b;
      if (len != right.nodes.length) return nodes.no;
      for (var i = 0; i < len; ++i) {
        a = this.nodes[i];
        b = right.nodes[i];
        if (a.operate(op, b).isTrue) continue;
        return nodes.no;
      }
      return nodes.yes;
      break;
    default:
      return this.first.operate(op, right, val);
  }
};

/**
 * Iterate nodes to return a `Boolean`.
 *
 * @return {Boolean}
 * @api public
 */

Expression.prototype.toBoolean = function(){
  for (var i = 0, len = this.nodes.length; i < len; ++i) {
    if (this.nodes[i].toBoolean().isTrue) {
      return nodes.yes;
    }
  }
  return nodes.no;
};

/**
 * Return "<a> <b> <c>" or "<a>, <b>, <c>" if
 * the expression represents a list.
 *
 * @return {String}
 * @api public
 */

Expression.prototype.toString = function(){
  return '(' + this.nodes.map(function(node){
    return node.toString();
  }).join(this.isList ? ', ' : ' ') + ')';
};



});// module: nodes/expression.js


require.register("nodes/fontface.js", function(module, exports, require){


/*!
 * Stylus - FontFace
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `FontFace` with the given `block`.
 *
 * @param {Block} block
 * @api public
 */

var FontFace = module.exports = function FontFace(block){
  Node.call(this);
  this.block = block;
};

/**
 * Inherit from `Node.prototype`.
 */

FontFace.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

FontFace.prototype.clone = function(){
  var clone = new FontFace(this.block.clone());
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

/**
 * Return `@oage name`.
 *
 * @return {String}
 * @api public
 */

FontFace.prototype.toString = function(){
  return '@font-face';
};


});// module: nodes/fontface.js


require.register("nodes/function.js", function(module, exports, require){


/*!
 * Stylus - Function
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Function` with `name`, `params`, and `body`.
 *
 * @param {String} name
 * @param {Params|Function} params
 * @param {Block} body
 * @api public
 */

var Function = module.exports = function Function(name, params, body){
  Node.call(this);
  this.name = name;
  this.params = params;
  this.block = body;
  if ('function' == typeof params) this.fn = params;
};

/**
 * Check function arity.
 *
 * @return {Boolean}
 * @api public
 */

Function.prototype.__defineGetter__('arity', function(){
  return this.params.length;
});

/**
 * Inherit from `Node.prototype`.
 */

Function.prototype.__proto__ = Node.prototype;

/**
 * Return hash.
 *
 * @return {String}
 * @api public
 */

Function.prototype.__defineGetter__('hash', function(){
  return 'function ' + this.name;
});

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Function.prototype.clone = function(){
  if (this.fn) {
    var clone = new Function(
        this.name
      , this.fn);
  } else {
    var clone = new Function(
        this.name
      , this.params.clone()
      , this.block.clone());
  }
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

/**
 * Return <name>(param1, param2, ...).
 *
 * @return {String}
 * @api public
 */

Function.prototype.toString = function(){
  if (this.fn) {
    return this.name
      + '('
      + this.fn.toString()
        .match(/^function *\((.*?)\)/)
        .slice(1)
        .join(', ')
      + ')';
  } else {
    return this.name
      + '('
      + this.params.nodes.join(', ')
      + ')';
  }
};


});// module: nodes/function.js


require.register("nodes/group.js", function(module, exports, require){


/*!
 * Stylus - Group
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Group`.
 *
 * @api public
 */

var Group = module.exports = function Group(){
  Node.call(this);
  this.nodes = [];
};

/**
 * Inherit from `Node.prototype`.
 */

Group.prototype.__proto__ = Node.prototype;

/**
 * Push the given `selector` node.
 *
 * @param {Selector} selector
 * @api public
 */

Group.prototype.push = function(selector){
  this.nodes.push(selector);
};

/**
 * Return this set's `Block`.
 */

Group.prototype.__defineGetter__('block', function(){
  return this.nodes[0].block;
});

/**
 * Assign `block` to each selector in this set.
 *
 * @param {Block} block
 * @api public
 */

Group.prototype.__defineSetter__('block', function(block){
  for (var i = 0, len = this.nodes.length; i < len; ++i) {
    this.nodes[i].block = block;
  }
});

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Group.prototype.clone = function(){
  var clone = new Group;
  clone.lineno = this.lineno;
  this.nodes.forEach(function(node){
    clone.push(node.clone());
  });
  clone.filename = this.filename;
  clone.block = this.block.clone();
  return clone;
};


});// module: nodes/group.js


require.register("nodes/hsla.js", function(module, exports, require){


/*!
 * Stylus - HSLA
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `HSLA` with the given h,s,l,a component values.
 *
 * @param {Number} h
 * @param {Number} s
 * @param {Number} l
 * @param {Number} a
 * @api public
 */

var HSLA = exports = module.exports = function HSLA(h,s,l,a){
  Node.call(this);
  this.h = clampDegrees(h);
  this.s = clampPercentage(s);
  this.l = clampPercentage(l);
  this.a = clampAlpha(a);
  this.hsla = this;
};

/**
 * Inherit from `Node.prototype`.
 */

HSLA.prototype.__proto__ = Node.prototype;

/**
 * Return hsla(n,n,n,n).
 *
 * @return {String}
 * @api public
 */

HSLA.prototype.toString = function(){
  return 'hsla('
    + this.h + ','
    + this.s.toFixed(0) + ','
    + this.l.toFixed(0) + ','
    + this.a + ')';
};

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

HSLA.prototype.clone = function(){
  var clone = new HSLA(
      this.h
    , this.s
    , this.l
    , this.a);
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

/**
 * Return rgba `RGBA` representation.
 *
 * @return {RGBA}
 * @api public
 */

HSLA.prototype.__defineGetter__('rgba', function(){
  return nodes.RGBA.fromHSLA(this);
});

/**
 * Return hash.
 *
 * @return {String}
 * @api public
 */

HSLA.prototype.__defineGetter__('hash', function(){
  return this.rgba.toString();
});

/**
 * Add h,s,l to the current component values.
 *
 * @param {Number} h
 * @param {Number} s
 * @param {Number} l
 * @return {HSLA} new node
 * @api public
 */

HSLA.prototype.add = function(h,s,l){
  return new HSLA(
      this.h + h
    , this.s + s
    , this.l + l
    , this.a);
};

/**
 * Subtract h,s,l from the current component values.
 *
 * @param {Number} h
 * @param {Number} s
 * @param {Number} l
 * @return {HSLA} new node
 * @api public
 */

HSLA.prototype.sub = function(h,s,l){
  return this.add(-h, -s, -l);
};

/**
 * Operate on `right` with the given `op`.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

HSLA.prototype.operate = function(op, right){
  switch (op) {
    case '==':
    case '!=':
    case '<=':
    case '>=':
    case '<':
    case '>':
    case 'is a':
    case '||':
    case '&&':
      return this.rgba.operate(op, right);
    default:
      return this.rgba.operate(op, right).hsla;
  }
};

/**
 * Return `HSLA` representation of the given `color`.
 *
 * @param {RGBA} color
 * @return {HSLA}
 * @api public
 */

exports.fromRGBA = function(rgba){
  var r = rgba.r / 255
    , g = rgba.g / 255
    , b = rgba.b / 255
    , a = rgba.a;

  var min = Math.min(r,g,b)
    , max = Math.max(r,g,b)
    , l = (max + min) / 2
    , d = max - min
    , h, s;

  switch (max) {
    case min: h = 0; break;
    case r: h = 60 * (g-b) / d; break;
    case g: h = 60 * (b-r) / d + 120; break;
    case b: h = 60 * (r-g) / d + 240; break;
  }

  if (max == min) {
    s = 0;
  } else if (l < .5) {
    s = d / (2 * l);
  } else {
    s = d / (2 - 2 * l);
  }

  h %= 360;
  s *= 100;
  l *= 100;

  return new HSLA(h,s,l,a);
};

/**
 * Adjust lightness by `percent`.
 *
 * @param {Number} percent
 * @return {HSLA} for chaining
 * @api public
 */

HSLA.prototype.adjustLightness = function(percent){
  this.l = clampPercentage(this.l + this.l * (percent / 100));
  return this;
};

/**
 * Adjust hue by `deg`.
 *
 * @param {Number} deg
 * @return {HSLA} for chaining
 * @api public
 */

HSLA.prototype.adjustHue = function(deg){
  this.h = clampDegrees(this.h + deg);
  return this;
};

/**
 * Clamp degree `n` >= 0 and <= 360.
 *
 * @param {Number} n
 * @return {Number}
 * @api private
 */

function clampDegrees(n) {
  n = n % 360;
  return n >= 0 ? n : 360 + n;
}

/**
 * Clamp percentage `n` >= 0 and <= 100.
 *
 * @param {Number} n
 * @return {Number}
 * @api private
 */

function clampPercentage(n) {
  return Math.max(0, Math.min(n, 100));
}

/**
 * Clamp alpha `n` >= 0 and <= 1.
 *
 * @param {Number} n
 * @return {Number}
 * @api private
 */

function clampAlpha(n) {
  return Math.max(0, Math.min(n, 1));
}


});// module: nodes/hsla.js


require.register("nodes/ident.js", function(module, exports, require){


/*!
 * Stylus - Ident
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Ident` by `name` with the given `val` node.
 *
 * @param {String} name
 * @param {Node} val
 * @api public
 */

var Ident = module.exports = function Ident(name, val){
  Node.call(this);
  this.name = name;
  this.string = name;
  this.val = val || nodes.nil;
};

/**
 * Check if the variable has a value.
 *
 * @return {Boolean}
 * @api public
 */

Ident.prototype.__defineGetter__('isEmpty', function(){
  return undefined == this.val;
});

/**
 * Return hash.
 *
 * @return {String}
 * @api public
 */

Ident.prototype.__defineGetter__('hash', function(){
  return this.name;
});

/**
 * Inherit from `Node.prototype`.
 */

Ident.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Ident.prototype.clone = function(){
  var clone = new Ident(this.name, this.val.clone());
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  clone.property = this.property;
  return clone;
};

/**
 * Return <name>.
 *
 * @return {String}
 * @api public
 */

Ident.prototype.toString = function(){
  return this.name;
};

/**
 * Coerce `other` to an ident.
 *
 * @param {Node} other
 * @return {String}
 * @api public
 */

Ident.prototype.coerce = function(other){
  switch (other.nodeName) {
    case 'ident':
    case 'string':
    case 'literal':
      return new Ident(other.string);
    default:
      return Node.prototype.coerce.call(this, other);
  }
};

/**
 * Operate on `right` with the given `op`.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

Ident.prototype.operate = function(op, right){
  var val = right.first;
  switch (op) {
    case '-':
      if ('unit' == val.nodeName) {
        var expr = new nodes.Expression;
        val.val = -val.val;
        expr.push(this);
        expr.push(val);
        return expr;
      }
    case '+':
      return new nodes.Ident(this.string + this.coerce(val).string);
  }
  return Node.prototype.operate.call(this, op, right);
};


});// module: nodes/ident.js


require.register("nodes/if.js", function(module, exports, require){


/*!
 * Stylus - If
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `If` with the given `cond`.
 *
 * @param {Expression} cond
 * @param {Boolean|Block} negate, block
 * @api public
 */

var If = module.exports = function If(cond, negate){
  Node.call(this);
  this.cond = cond;
  this.elses = [];
  if (negate && negate.nodeName) {
    this.block = negate;
  } else {
    this.negate = negate;
  }
};

/**
 * Inherit from `Node.prototype`.
 */

If.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

If.prototype.clone = function(){
  var cond = this.cond.clone()
    , block = this.block.clone();
  var clone = new If(cond, block);
  clone.elses = this.elses.map(function(node){ return node.clone(); });
  clone.negate = this.negate;
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};


});// module: nodes/if.js


require.register("nodes/import.js", function(module, exports, require){


/*!
 * Stylus - Import
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Import` with the given `expr`.
 *
 * @param {Expression} expr
 * @api public
 */

var Import = module.exports = function Import(expr){
  Node.call(this);
  this.path = expr;
};

/**
 * Inherit from `Node.prototype`.
 */

Import.prototype.__proto__ = Node.prototype;


});// module: nodes/import.js


require.register("nodes/index.js", function(module, exports, require){


/*!
 * Stylus - nodes
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Constructors
 */

exports.Node = require('./node');
exports.Root = require('./root');
exports.Null = require('./null');
exports.Each = require('./each');
exports.If = require('./if');
exports.Call = require('./call');
exports.Page = require('./page');
exports.FontFace = require('./fontface');
exports.UnaryOp = require('./unaryop');
exports.BinOp = require('./binop');
exports.Ternary = require('./ternary');
exports.Block = require('./block');
exports.Unit = require('./unit');
exports.String = require('./string');
exports.HSLA = require('./hsla');
exports.RGBA = require('./rgba');
exports.Ident = require('./ident');
exports.Group = require('./group');
exports.Literal = require('./literal');
exports.JSLiteral = require('./jsliteral');
exports.Boolean = require('./boolean');
exports.Return = require('./return');
exports.Media = require('./media');
exports.Params = require('./params');
exports.Comment = require('./comment');
exports.Keyframes = require('./keyframes');
exports.Charset = require('./charset');
exports.Import = require('./import');
exports.Function = require('./function');
exports.Property = require('./property');
exports.Selector = require('./selector');
exports.Expression = require('./expression');
exports.Arguments = require('./arguments');

/**
 * Singletons.
 */

exports.yes = new exports.Boolean(true);
exports.no = new exports.Boolean(false);
exports.nil = new exports.Null;

});// module: nodes/index.js


require.register("nodes/jsliteral.js", function(module, exports, require){


/*!
 * Stylus - JSLiteral
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `JSLiteral` with the given `str`.
 *
 * @param {String} str
 * @api public
 */

var JSLiteral = module.exports = function JSLiteral(str){
  Node.call(this);
  this.val = str;
  this.string = str;
};

/**
 * Inherit from `Node.prototype`.
 */

JSLiteral.prototype.__proto__ = Node.prototype;


});// module: nodes/jsliteral.js


require.register("nodes/keyframes.js", function(module, exports, require){


/*!
 * Stylus - Keyframes
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Keyframes` with the given `name`,
 * and optional vendor `prefix`.
 *
 * @param {String} name
 * @param {String} prefix
 * @api public
 */

var Keyframes = module.exports = function Keyframes(name, prefix){
  Node.call(this);
  this.name = name;
  this.frames = [];
  this.prefix = prefix || 'official';
};

/**
 * Inherit from `Node.prototype`.
 */

Keyframes.prototype.__proto__ = Node.prototype;

/**
 * Push the given `block` at `pos`.
 *
 * @param {Unit} pos
 * @param {Block} block
 * @api public
 */

Keyframes.prototype.push = function(pos, block){
  this.frames.push({
      pos: pos
    , block: block
  });
};

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Keyframes.prototype.clone = function(){
  var clone = new Keyframes(this.name);
  clone.lineno = this.lineno;
  clone.prefix = this.prefix;
  clone.frames = this.frames.map(function(node){
    node.block = node.block.clone();
    return node;
  });
  return clone;
};

/**
 * Return `@keyframes name`.
 *
 * @return {String}
 * @api public
 */

Keyframes.prototype.toString = function(){
  return '@keyframes ' + this.name;
};


});// module: nodes/keyframes.js


require.register("nodes/literal.js", function(module, exports, require){


/*!
 * Stylus - Literal
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Literal` with the given `str`.
 *
 * @param {String} str
 * @api public
 */

var Literal = module.exports = function Literal(str){
  Node.call(this);
  this.val = str;
  this.string = str;
};

/**
 * Inherit from `Node.prototype`.
 */

Literal.prototype.__proto__ = Node.prototype;

/**
 * Return hash.
 *
 * @return {String}
 * @api public
 */

Literal.prototype.__defineGetter__('hash', function(){
  return this.val;
});

/**
 * Return literal value.
 *
 * @return {String}
 * @api public
 */

Literal.prototype.toString = function(){
  return this.val;
};

/**
 * Coerce `other` to a literal.
 *
 * @param {Node} other
 * @return {String}
 * @api public
 */

Literal.prototype.coerce = function(other){
  switch (other.nodeName) {
    case 'ident':
    case 'string':
    case 'literal':
      return new Literal(other.string);
    default:
      return Node.prototype.coerce.call(this, other);
  }
};

/**
 * Operate on `right` with the given `op`.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

Literal.prototype.operate = function(op, right){
  var val = right.first;
  switch (op) {
    case '+':
      return new nodes.Literal(this.string + this.coerce(val).string);
    default:
      return Node.prototype.operate.call(this, op, right);
  }
};


});// module: nodes/literal.js


require.register("nodes/media.js", function(module, exports, require){


/*!
 * Stylus - Media
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Media` with the given `val`
 *
 * @param {String} val
 * @api public
 */

var Media = module.exports = function Media(val){
  Node.call(this);
  this.val = val;
};

/**
 * Inherit from `Node.prototype`.
 */

Media.prototype.__proto__ = Node.prototype;

/**
 * Return @media "val".
 *
 * @return {String}
 * @api public
 */

Media.prototype.toString = function(){
  return '@media ' + this.val;
};


});// module: nodes/media.js


require.register("nodes/node.js", function(module, exports, require){


/*!
 * Stylus - Node
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Evaluator = require('../visitor/evaluator')
  , utils = require('../utils')
  , nodes = require('./index');

/**
 * Node constructor.
 *
 * @api public
 */

var Node = module.exports = function Node(){
  this.lineno = nodes.lineno;
  Object.defineProperty(this, 'filename', { writable: true, value: nodes.filename });
};

/**
 * Return this node.
 *
 * @return {Node}
 * @api public
 */

Node.prototype.__defineGetter__('first', function(){
  return this;
});

/**
 * Return hash.
 *
 * @return {String}
 * @api public
 */

Node.prototype.__defineGetter__('hash', function(){
  return this.val;
});

/**
 * Return node name.
 *
 * @return {String}
 * @api public
 */

Node.prototype.__defineGetter__('nodeName', function(){
  return this.constructor.name.toLowerCase();
});

/**
 * Return this node.
 * 
 * @return {Node}
 * @api public
 */

Node.prototype.clone = function(){
  return this;
};

/**
 * Nodes by default evaluate to themselves.
 *
 * @return {Node}
 * @api public
 */

Node.prototype.eval = function(){
  return new Evaluator(this).evaluate();
};

/**
 * Return true.
 *
 * @return {Boolean}
 * @api public
 */

Node.prototype.toBoolean = function(){
  return nodes.yes;
};

/**
 * Return the expression, or wrap this node in an expression.
 *
 * @return {Expression}
 * @api public
 */

Node.prototype.toExpression = function(){
  if ('expression' == this.nodeName) return this;
  var expr = new nodes.Expression;
  expr.push(this);
  return expr;
};

/**
 * Return false if `op` is generally not coerced.
 *
 * @param {String} op
 * @return {Boolean}
 * @api private
 */

Node.prototype.shouldCoerce = function(op){
  switch (op) {
    case 'is a':
    case 'in':
    case '||':
    case '&&':
      return false;
    default:
      return true;
  }
};

/**
 * Operate on `right` with the given `op`.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

Node.prototype.operate = function(op, right){
  switch (op) {
    case 'is a':
      if ('string' == right.nodeName) {
        return nodes.Boolean(this.nodeName == right.val);
      } else {
        throw new Error('"is a" expects a string, got ' + right.toString());
      }
    case '==':
      return nodes.Boolean(this.hash == right.hash);
    case '!=':
      return nodes.Boolean(this.hash != right.hash);
    case '>=':
      return nodes.Boolean(this.hash >= right.hash);
    case '<=':
      return nodes.Boolean(this.hash <= right.hash);
    case '>':
      return nodes.Boolean(this.hash > right.hash);
    case '<':
      return nodes.Boolean(this.hash < right.hash);
    case '||':
      return this.toBoolean().isTrue
        ? this
        : right;
    case 'in':
      var vals = utils.unwrap(right).nodes
        , hash = this.hash;
      if (!vals) throw new Error('"in" given invalid right-hand operand, expecting an expression');
      for (var i = 0, len = vals.length; i < len; ++i) {
        if (hash == vals[i].hash) {
          return nodes.yes;
        }
      }
      return nodes.no;
    case '&&':
      var a = this.toBoolean()
        , b = right.toBoolean();
      return a.isTrue && b.isTrue
        ? right
        : a.isFalse
          ? this
          : right;
    default:
      if ('[]' == op) {
        var msg = 'cannot perform '
          + this
          + '[' + right + ']';
      } else {
        var msg = 'cannot perform'
          + ' ' + this
          + ' ' + op
          + ' ' + right;
      }
      throw new Error(msg);
  }
};

/**
 * Initialize a new `CoercionError` with the given `msg`.
 *
 * @param {String} msg
 * @api private
 */

function CoercionError(msg) {
  this.name = 'CoercionError'
  this.message = msg
  Error.captureStackTrace(this, CoercionError);
}

/**
 * Inherit from `Error.prototype`.
 */

CoercionError.prototype.__proto__ = Error.prototype;

/**
 * Default coercion throws.
 *
 * @param {Node} other
 * @return {Node}
 * @api public
 */

Node.prototype.coerce = function(other){
  if (other.nodeName == this.nodeName) return other;
  throw new CoercionError('cannot coerce ' + other + ' to ' + this.nodeName);
};


});// module: nodes/node.js


require.register("nodes/null.js", function(module, exports, require){


/*!
 * Stylus - Null
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Null` node.
 *
 * @api public
 */

var Null = module.exports = function Null(){};

/**
 * Inherit from `Node.prototype`.
 */

Null.prototype.__proto__ = Node.prototype;

/**
 * Return 'Null'.
 *
 * @return {String}
 * @api public
 */

Null.prototype.inspect = 
Null.prototype.toString = function(){
  return 'null';
};

/**
 * Return false.
 *
 * @return {Boolean}
 * @api public
 */

Null.prototype.toBoolean = function(){
  return nodes.no;
};

/**
 * Check if the node is a null node.
 *
 * @return {Boolean}
 * @api public
 */

Null.prototype.__defineGetter__('isNull', function(){
  return true;
});

/**
 * Return hash.
 *
 * @return {String}
 * @api public
 */

Null.prototype.__defineGetter__('hash', function(){
  return null;
});

});// module: nodes/null.js


require.register("nodes/page.js", function(module, exports, require){


/*!
 * Stylus - Page
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Page` with the given `selector` and `block`.
 *
 * @param {Selector} selector
 * @param {Block} block
 * @api public
 */

var Page = module.exports = function Page(selector, block){
  Node.call(this);
  this.selector = selector;
  this.block = block;
};

/**
 * Inherit from `Node.prototype`.
 */

Page.prototype.__proto__ = Node.prototype;

/**
 * Return `@oage name`.
 *
 * @return {String}
 * @api public
 */

Page.prototype.toString = function(){
  return '@page ' + this.selector;
};


});// module: nodes/page.js


require.register("nodes/params.js", function(module, exports, require){


/*!
 * Stylus - Params
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Params` with `name`, `params`, and `body`.
 *
 * @param {String} name
 * @param {Params} params
 * @param {Expression} body
 * @api public
 */

var Params = module.exports = function Params(){
  Node.call(this);
  this.nodes = [];
};

/**
 * Check function arity.
 *
 * @return {Boolean}
 * @api public
 */

Params.prototype.__defineGetter__('length', function(){
  return this.nodes.length;
});

/**
 * Inherit from `Node.prototype`.
 */

Params.prototype.__proto__ = Node.prototype;

/**
 * Push the given `node`.
 *
 * @param {Node} node
 * @api public
 */

Params.prototype.push = function(node){
  this.nodes.push(node);
};

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Params.prototype.clone = function(){
  var clone = new Params;
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  this.nodes.forEach(function(node){
    clone.push(node.clone());
  });
  return clone;
};



});// module: nodes/params.js


require.register("nodes/property.js", function(module, exports, require){


/*!
 * Stylus - Property
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Property` with the given `segs` and optional `expr`.
 *
 * @param {Array} segs
 * @param {Expression} expr
 * @api public
 */

var Property = module.exports = function Property(segs, expr){
  Node.call(this);
  this.segments = segs;
  this.expr = expr;
};

/**
 * Inherit from `Node.prototype`.
 */

Property.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Property.prototype.clone = function(){
  var clone = new Property(this.segments);
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  clone.segments = this.segments.map(function(node){ return node.clone(); });
  if (this.expr) clone.expr = this.expr.clone();
  return clone;
};

/**
 * Return string representation of this node.
 *
 * @return {String}
 * @api public
 */

Property.prototype.toString = function(){
  return 'property(' + this.name + ', ' + this.expr + ')';
};

/**
 * Operate on the property expression.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

Property.prototype.operate = function(op, right, val){
  return this.expr.operate(op, right, val);
};


});// module: nodes/property.js


require.register("nodes/return.js", function(module, exports, require){


/*!
 * Stylus - Return
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Return` node with the given `expr`.
 *
 * @param {Expression} expr
 * @api public
 */

var Return = module.exports = function Return(expr){
  this.expr = expr || nodes.nil;
};

/**
 * Inherit from `Node.prototype`.
 */

Return.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Return.prototype.clone = function(){
  var clone = new Return(this.expr.clone());
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

});// module: nodes/return.js


require.register("nodes/rgba.js", function(module, exports, require){


/*!
 * Stylus - RGBA
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , HSLA = require('./hsla')
  , functions = require('../functions')
  , adjust = functions['-adjust']
  , nodes = require('./index');

/**
 * Initialize a new `RGBA` with the given r,g,b,a component values.
 *
 * @param {Number} r
 * @param {Number} g
 * @param {Number} b
 * @param {Number} a
 * @api public
 */

var RGBA = exports = module.exports = function RGBA(r,g,b,a){
  Node.call(this);
  this.r = clamp(r);
  this.g = clamp(g);
  this.b = clamp(b);
  this.a = clampAlpha(a);
  this.rgba = this;
};

/**
 * Inherit from `Node.prototype`.
 */

RGBA.prototype.__proto__ = Node.prototype;

/**
 * Return an `RGBA` without clamping values.
 * 
 * @param {Number} r
 * @param {Number} g
 * @param {Number} b
 * @param {Number} a
 * @return {RGBA}
 * @api public
 */

RGBA.withoutClamping = function(r,g,b,a){
  var rgba = new RGBA(0,0,0,0);
  rgba.r = r;
  rgba.g = g;
  rgba.b = b;
  rgba.a = a;
  return rgba;
};

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

RGBA.prototype.clone = function(){
  var clone = new RGBA(
      this.r
    , this.g
    , this.b
    , this.a);
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

/**
 * Return true.
 *
 * @return {Boolean}
 * @api public
 */

RGBA.prototype.toBoolean = function(){
  return nodes.yes;
};

/**
 * Return `HSLA` representation.
 *
 * @return {HSLA}
 * @api public
 */

RGBA.prototype.__defineGetter__('hsla', function(){
  return HSLA.fromRGBA(this);
});

/**
 * Return hash.
 *
 * @return {String}
 * @api public
 */

RGBA.prototype.__defineGetter__('hash', function(){
  return this.toString();
});

/**
 * Add r,g,b,a to the current component values.
 *
 * @param {Number} r
 * @param {Number} g
 * @param {Number} b
 * @param {Number} a
 * @return {RGBA} new node
 * @api public
 */

RGBA.prototype.add = function(r,g,b,a){
  return new RGBA(
      this.r + r
    , this.g + g
    , this.b + b
    , this.a + a);
};

/**
 * Subtract r,g,b,a from the current component values.
 *
 * @param {Number} r
 * @param {Number} g
 * @param {Number} b
 * @param {Number} a
 * @return {RGBA} new node
 * @api public
 */

RGBA.prototype.sub = function(r,g,b,a){
  return new RGBA(
      this.r - r
    , this.g - g
    , this.b - b
    , a == 1 ? this.a : this.a - a);
};

/**
 * Multiply rgb components by `n`.
 *
 * @param {String} n
 * @return {RGBA} new node
 * @api public
 */

RGBA.prototype.multiply = function(n){
  return new RGBA(
      this.r * n
    , this.g * n
    , this.b * n
    , this.a); 
};

/**
 * Divide rgb components by `n`.
 *
 * @param {String} n
 * @return {RGBA} new node
 * @api public
 */

RGBA.prototype.divide = function(n){
  return new RGBA(
      this.r / n
    , this.g / n
    , this.b / n
    , this.a); 
};

/**
 * Operate on `right` with the given `op`.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

RGBA.prototype.operate = function(op, right){
  right = right.first;

  switch (op) {
    case 'is a':
      if ('string' == right.nodeName && 'color' == right.string) {
        return nodes.yes;
      }
      break;
    case '+':
      switch (right.nodeName) {
        case 'unit':
          var n = right.val;
          switch (right.type) {
            case '%': return adjust(this, new nodes.String('lightness'), right);
            case 'deg': return this.hsla.adjustHue(n).rgba;
            default: return this.add(n,n,n,0);
          }
        case 'rgba':
          return this.add(right.r, right.g, right.b, right.a);
        case 'hsla':
          return this.hsla.add(right.h, right.s, right.l);
      }
      break;
    case '-':
      switch (right.nodeName) {
        case 'unit':
          var n = right.val;
          switch (right.type) {
            case '%': return adjust(this, new nodes.String('lightness'), new nodes.Unit(-n, '%'));
            case 'deg': return this.hsla.adjustHue(-n).rgba;
            default: return this.sub(n,n,n,0);
          }
        case 'rgba':
          return this.sub(right.r, right.g, right.b, right.a);
        case 'hsla':
          return this.hsla.sub(right.h, right.s, right.l);
      }
      break;
    case '*':
      switch (right.nodeName) {
        case 'unit':
          return this.multiply(right.val);
      }
      break;
    case '/':
      switch (right.nodeName) {
        case 'unit':
          return this.divide(right.val);
      }
      break;
  }
  return Node.prototype.operate.call(this, op, right);
};

/**
 * Return #nnnnnn, #nnn, or rgba(n,n,n,n) string representation of the color.
 *
 * @return {String}
 * @api public
 */

RGBA.prototype.toString = function(){
  function pad(n) {
    return n < 16
      ? '0' + n.toString(16)
      : n.toString(16);
  }

  if (1 == this.a) {
    var r = pad(this.r)
      , g = pad(this.g)
      , b = pad(this.b);

    // Compress
    if (r[0] == r[1] && g[0] == g[1] && b[0] == b[1]) {
      return '#' + r[0] + g[0] + b[0];
    } else {
      return '#' + r + g + b;
    }
  } else {
    return 'rgba('
      + this.r + ','
      + this.g + ','
      + this.b + ','
      + this.a.toFixed(2) + ')';
  }
};

/**
 * Return a `RGBA` from the given `hsla`.
 *
 * @param {HSLA} hsla
 * @return {RGBA}
 * @api public
 */

exports.fromHSLA = function(hsla){
  var h = hsla.h / 360
    , s = hsla.s / 100
    , l = hsla.l / 100
    , a = hsla.a;

  var m2 = l <= .5 ? l * (s + 1) : l + s - l * s
    , m1 = l * 2 - m2;

  var r = hue(h + 1/3) * 0xff
    , g = hue(h) * 0xff
    , b = hue(h - 1/3) * 0xff;

  function hue(h) {
    if (h < 0) ++h;
    if (h > 1) --h;
    if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
    if (h * 2 < 1) return m2;
    if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;
    return m1;
  }
  
  return new RGBA(r,g,b,a);
};

/**
 * Clamp `n` >= 0 and <= 255.
 *
 * @param {Number} n
 * @return {Number}
 * @api private
 */

function clamp(n) {
  return Math.max(0, Math.min(n.toFixed(0), 255));
}

/**
 * Clamp alpha `n` >= 0 and <= 1.
 *
 * @param {Number} n
 * @return {Number}
 * @api private
 */

function clampAlpha(n) {
  return Math.max(0, Math.min(n, 1));
}


});// module: nodes/rgba.js


require.register("nodes/root.js", function(module, exports, require){


/*!
 * Stylus - Root
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Root` node.
 *
 * @api public
 */

var Root = module.exports = function Root(){
  this.nodes = [];
};

/**
 * Inherit from `Node.prototype`.
 */

Root.prototype.__proto__ = Node.prototype;

/**
 * Push a `node` to this block.
 *
 * @param {Node} node
 * @api public
 */

Root.prototype.push = function(node){
  this.nodes.push(node);
};

/**
 * Return "root".
 *
 * @return {String}
 * @api public
 */

Root.prototype.toString = function(){
  return '[Root]';
};


});// module: nodes/root.js


require.register("nodes/selector.js", function(module, exports, require){


/*!
 * Stylus - Selector
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Block = require('./block')
  , Node = require('./node');

/**
 * Initialize a new `Selector` with the given `segs`.
 *
 * @param {Array} segs
 * @api public
 */

var Selector = module.exports = function Selector(segs){
  Node.call(this);
  this.segments = segs;
};

/**
 * Inherit from `Node.prototype`.
 */

Selector.prototype.__proto__ = Node.prototype;

/**
 * Return the selector string.
 *
 * @return {String}
 * @api public
 */

Selector.prototype.toString = function(){
  return this.segments.join('');
};

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Selector.prototype.clone = function(){
  var clone = new Selector;
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  clone.segments = this.segments.map(function(node){ return node.clone(); });
  return clone;
};


});// module: nodes/selector.js


require.register("nodes/string.js", function(module, exports, require){


/*!
 * Stylus - String
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , sprintf = require('../functions').s
  , utils = require('../utils')
  , nodes = require('./index');

/**
 * Initialize a new `String` with the given `val`.
 *
 * @param {String} val
 * @api public
 */

var String = module.exports = function String(val){
  Node.call(this);
  this.val = val;
  this.string = val;
};

/**
 * Inherit from `Node.prototype`.
 */

String.prototype.__proto__ = Node.prototype;

/**
 * Return quoted string.
 *
 * @return {String}
 * @api public
 */

String.prototype.toString = function(){
  return '"' + this.val + '"';
};

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

String.prototype.clone = function(){
  var clone = new String(this.val);
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

/**
 * Return Boolean based on the length of this string.
 *
 * @return {Boolean}
 * @api public
 */

String.prototype.toBoolean = function(){
  return nodes.Boolean(this.val.length);
};

/**
 * Coerce `other` to a string.
 *
 * @param {Node} other
 * @return {String}
 * @api public
 */

String.prototype.coerce = function(other){
  switch (other.nodeName) {
    case 'string':
      return other;
    case 'expression':
      return new String(other.nodes.map(function(node){
        return this.coerce(node).val;
      }, this).join(' '));
    default:
      return new String(other.toString());
  }
};

/**
 * Operate on `right` with the given `op`.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

String.prototype.operate = function(op, right){
  switch (op) {
    case '%':
      var expr = new nodes.Expression;
      expr.push(this);

      // constructargs
      var args = 'expression' == right.nodeName
        ? utils.unwrap(right).nodes
        : [right];

      // apply
      return sprintf.apply(null, [expr].concat(args));
    case '+':
      return new String(this.val + this.coerce(right).val);
    default:
      return Node.prototype.operate.call(this, op, right);
  }
};


});// module: nodes/string.js


require.register("nodes/ternary.js", function(module, exports, require){


/*!
 * Stylus - Ternary
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `Ternary` with `cond`, `trueExpr` and `falseExpr`.
 *
 * @param {Expression} cond
 * @param {Expression} trueExpr
 * @param {Expression} falseExpr
 * @api public
 */

var Ternary = module.exports = function Ternary(cond, trueExpr, falseExpr){
  Node.call(this);
  this.cond = cond;
  this.trueExpr = trueExpr;
  this.falseExpr = falseExpr;
};

/**
 * Inherit from `Node.prototype`.
 */

Ternary.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Ternary.prototype.clone = function(){
  var clone = new Ternary(
      this.cond.clone()
    , this.trueExpr.clone()
    , this.falseExpr.clone());
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

});// module: nodes/ternary.js


require.register("nodes/unaryop.js", function(module, exports, require){


/*!
 * Stylus - UnaryOp
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

/**
 * Initialize a new `UnaryOp` with `op`, and `expr`.
 *
 * @param {String} op
 * @param {Node} expr
 * @api public
 */

var UnaryOp = module.exports = function UnaryOp(op, expr){
  Node.call(this);
  this.op = op;
  this.expr = expr;
};

/**
 * Inherit from `Node.prototype`.
 */

UnaryOp.prototype.__proto__ = Node.prototype;

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

UnaryOp.prototype.clone = function(){
  var clone = new UnaryOp(this.op, this.expr.clone());
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

});// module: nodes/unaryop.js


require.register("nodes/unit.js", function(module, exports, require){


/*!
 * Stylus - Unit
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node')
  , nodes = require('./index');

/**
 * Initialize a new `Unit` with the given `val` and unit `type`
 * such as "px", "pt", "in", etc.
 *
 * @param {String} val
 * @param {String} type
 * @api public
 */

var Unit = module.exports = function Unit(val, type){
  Node.call(this);
  this.val = val;
  this.type = type;
};

/**
 * Inherit from `Node.prototype`.
 */

Unit.prototype.__proto__ = Node.prototype;

/**
 * Return Boolean based on the unit value.
 *
 * @return {Boolean}
 * @api public
 */

Unit.prototype.toBoolean = function(){
  return nodes.Boolean(this.type
      ? true
      : this.val);
};

/**
 * Return unit string.
 *
 * @return {String}
 * @api public
 */

Unit.prototype.toString = function(){
  var n = this.val;
  if ('px' == this.type) n = n.toFixed(0);
  return n + (this.type || '');
};

/**
 * Return a clone of this node.
 * 
 * @return {Node}
 * @api public
 */

Unit.prototype.clone = function(){
  var clone = new Unit(this.val, this.type);
  clone.lineno = this.lineno;
  clone.filename = this.filename;
  return clone;
};

/**
 * Operate on `right` with the given `op`.
 *
 * @param {String} op
 * @param {Node} right
 * @return {Node}
 * @api public
 */

Unit.prototype.operate = function(op, right){
  var type = this.type || right.type;

  // swap color
  if ('rgba' == right.nodeName || 'hsla' == right.nodeName) {
    return right.operate(op, this);
  }

  // operate
  if (this.shouldCoerce(op)) {
    // percentages
    if (('-' == op || '+' == op) && '%' == right.type) {
      right.val = this.val * (right.val / 100);
    } else {
      right = this.coerce(right.first);
    }

    switch (op) {
      case '-':
        return new Unit(this.val - right.val, type);
      case '+':                               
        return new Unit(this.val + right.val, type);
      case '/':                               
        return new Unit(this.val / right.val, type);
      case '*':                               
        return new Unit(this.val * right.val, type);
      case '%':
        return new Unit(this.val % right.val, type);
      case '**':
        return new Unit(Math.pow(this.val, right.val), type);
      case '..':
      case '...':
        var start = this.val
          , end = right.val
          , expr = new nodes.Expression
          , inclusive = '..' == op;
        do {
          expr.push(new nodes.Unit(start));
        } while (inclusive ? ++start <= end : ++start < end);
        return expr;
    }
  }

  return Node.prototype.operate.call(this, op, right);
};

/**
 * Coerce `other` unit to the same type as `this` unit.
 *
 * Supports:
 *
 *    mm -> cm | in
 *    cm -> mm | in
 *    in -> mm | cm
 *    
 *    ms -> s
 *    s  -> ms
 *    
 *    Hz  -> kHz
 *    kHz -> Hz
 *
 * @param {Unit} other
 * @return {Unit}
 * @api public
 */

Unit.prototype.coerce = function(other){
  if ('unit' == other.nodeName) {
    var a = this
      , b = other;
    switch (a.type) {
      case 'mm':
        switch (b.type) {
          case 'cm':
            return new nodes.Unit(b.val * 2.54, 'mm');
          case 'in':
            return new nodes.Unit(b.val * 25.4, 'mm');
        }
      case 'cm':
        switch (b.type) {
          case 'mm':
            return new nodes.Unit(b.val / 10, 'cm');
          case 'in':
            return new nodes.Unit(b.val * 2.54, 'cm');
        }
      case 'in':
        switch (b.type) {
          case 'mm':
            return new nodes.Unit(b.val / 25.4, 'in');
          case 'cm':
            return new nodes.Unit(b.val / 2.54, 'in');
        }
      case 'ms':
        switch (b.type) {
          case 's':
            return new nodes.Unit(b.val * 1000, 'ms');
        }
      case 's':
        switch (b.type) {
          case 'ms':
            return new nodes.Unit(b.val / 1000, 's');
        }
      case 'Hz':
        switch (b.type) {
          case 'kHz':
            return new nodes.Unit(b.val * 1000, 'Hz');
        }
      case 'kHz':
        switch (b.type) {
          case 'Hz':
            return new nodes.Unit(b.val / 1000, 'kHz');
        }
      default:
        return new nodes.Unit(b.val, a.type);
    }
  } else if ('string' == other.nodeName) {
    var val = parseInt(other.val, 10);
    if (isNaN(val)) Node.prototype.coerce.call(this, other);
    return new nodes.Unit(val);
  } else {
    return Node.prototype.coerce.call(this, other);
  }
};


});// module: nodes/unit.js


require.register("parser.js", function(module, exports, require){

 
/*!
 * Stylus - Parser
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Lexer = require('./lexer')
  , nodes = require('./nodes')
  , Token = require('./token')
  , errors = require('./errors');

/**
 * Selector composite tokens.
 */

var selectorTokens = [
    'ident'
  , 'string'
  , 'selector'
  , 'function'
  , 'comment'
  , 'boolean'
  , 'space'
  , 'color'
  , 'unit'
  , 'for'
  , '['
  , ']'
  , '('
  , ')'
  , '+'
  , '-'
  , '*'
  , '*='
  , '<'
  , '>'
  , '='
  , ':'
  , '&'
  , '~'
  , '{'
  , '}'
];

/**
 * CSS3 pseudo-selectors.
 */

var pseudoSelectors = [
    'root'
  , 'nth-child'
  , 'nth-last-child'
  , 'nth-of-type'
  , 'nth-last-of-type'
  , 'first-child'
  , 'last-child'
  , 'first-of-type'
  , 'last-of-type'
  , 'only-child'
  , 'only-of-type'
  , 'empty'
  , 'link'
  , 'visited'
  , 'active'
  , 'hover'
  , 'focus'
  , 'target'
  , 'lang'
  , 'enabled'
  , 'disabled'
  , 'checked'
  , 'not'
];

/**
 * Initialize a new `Parser` with the given `str` and `options`.
 *
 * @param {String} str
 * @param {Object} options
 * @api private
 */

var Parser = module.exports = function Parser(str, options) {
  var self = this;
  options = options || {};
  this.lexer = new Lexer(str, options);
  this.root = options.root || new nodes.Root;
  this.state = ['root'];
  this.stash = [];
  this.parens = 0;
  this.state.pop = function(){
    self.prevState = [].pop.call(this);
  };
};

/**
 * Parser prototype.
 */

Parser.prototype = {
  
  /**
   * Constructor.
   */
  
  constructor: Parser,
  
  /**
   * Return current state.
   *
   * @return {String}
   * @api private
   */
  
  currentState: function() {
    return this.state[this.state.length - 1];
  },
  
  /**
   * Parse the input, then return the root node.
   *
   * @return {Node}
   * @api private
   */
  
  parse: function(){
    var block = this.parent = this.root;
    while ('eos' != this.peek().type) {
      if (this.accept('newline')) continue;
      var stmt = this.statement();
      this.accept(';');
      if (!stmt) this.error('unexpected token {peek}, not allowed at the root level');
      block.push(stmt);
    }
    return block;
  },
  
  /**
   * Throw an `Error` with the given `msg`.
   *
   * @param {String} msg
   * @api private
   */
  
  error: function(msg){
    var type = this.peek().type
      , val = undefined == this.peek().val
        ? ''
        : ' ' + this.peek().toString();
    if (val.trim() == type.trim()) val = '';
    throw new errors.ParseError(msg.replace('{peek}', '"' + type + val + '"'));
  },
  
  /**
   * Accept the given token `type`, and return it,
   * otherwise return `undefined`.
   *
   * @param {String} type
   * @return {Token}
   * @api private
   */

  accept: function(type){
    if (type == this.peek().type) {
      return this.next();
    }
  },

  /**
   * Expect token `type` and return it, throw otherwise.
   *
   * @param {String} type
   * @return {Token}
   * @api private
   */

  expect: function(type){
    if (type != this.peek().type) {
      this.error('expected "' + type + '", got {peek}');
    }
    return this.next();
  },
  
  /**
   * Get the next token.
   *
   * @return {Token}
   * @api private
   */
  
  next: function() {
    var tok = this.stash.length
      ? this.stash.pop()
      : this.lexer.next();
    nodes.lineno = tok.lineno;
    return tok;
  },
  
  /**
   * Peek with lookahead(1).
   *
   * @return {Token}
   * @api private
   */
  
  peek: function() {
    return this.lexer.peek();
  },
  
  /**
   * Lookahead `n` tokens.
   *
   * @param {Number} n
   * @return {Token}
   * @api private
   */
  
  lookahead: function(n){
    return this.lexer.lookahead(n);
  },
  
  /**
   * Check if the token at `n` is a valid selector token. 
   *
   * @param {Number} n
   * @return {Boolean}
   * @api private
   */
  
  isSelectorToken: function(n) {
    var la = this.lookahead(n).type;
    switch (la) {
      case 'for':
        return this.bracketed;
      case '[':
        this.bracketed = true;
        return true;
      case ']':
        this.bracketed = false;
        return true;
      default:
        return ~selectorTokens.indexOf(la);
    }
  },
  
  /**
   * Check if the token at `n` is a pseudo selector.
   *
   * @param {Number} n
   * @return {Boolean}
   * @api private
   */
  
  isPseudoSelector: function(n){
    return ~pseudoSelectors.indexOf(this.lookahead(n).val.name);
  },

  /**
   * Check if the current line contains `type`.
   *
   * @param {String} type
   * @return {Boolean}
   * @api private
   */

  lineContains: function(type){
    var i = 1
      , la;

    while (la = this.lookahead(i++)) {
      if (~['indent', 'outdent', 'newline'].indexOf(la.type)) return;
      if (type == la.type) return true;
    }
  },
  
  /**
   * Valid selector tokens.
   */
  
  selectorToken: function() {
    if (this.isSelectorToken(1)) {
      if ('{' == this.peek().type) {
        // unclosed, must be a block
        if (!this.lineContains('}')) return;
        // check if ':' is within the braces.
        // though not required by stylus, chances
        // are if someone is using {} they will
        // use css-style props, helping us with
        // the ambiguity in this case
        var i = 0
          , la;
        while (la = this.lookahead(++i)) {
          if ('}' == la.type) break;
          if (':' == la.type) return;
        }
      }
      return this.next();
    }
  },
  
  /**
   * Consume whitespace.
   */

  skipWhitespace: function() {
    while (~['space', 'indent', 'outdent', 'newline'].indexOf(this.peek().type))
      this.next();
  },

  /**
   * Consume spaces.
   */
  
  skipSpaces: function() {
    while ('space' == this.peek().type)
      this.next();
  },
  
  /**
   * Check if the following sequence of tokens
   * forms a function definition, ie trailing
   * `{` or indentation.
   */

  looksLikeFunctionDefinition: function(i) {
    return 'indent' == this.lookahead(i).type
      || '{' == this.lookahead(i).type;
  },
  
  /**
   * Check if the following sequence of tokens
   * forms a selector.
   */
  
  looksLikeSelector: function() {
    var i = 1
      , brace;

    // Assume selector when an ident is
    // followed by a selector
    while ('ident' == this.lookahead(i).type
      && 'newline' == this.lookahead(i + 1).type) i += 2;

    while (this.isSelectorToken(i)
      || ',' == this.lookahead(i).type) {

      if ('selector' == this.lookahead(i).type)
        return true;

      // the ':' token within braces signifies
      // a selector. ex: "foo{bar:'baz'}"
      if ('{' == this.lookahead(i).type) brace = true;
      else if ('}' == this.lookahead(i).type) brace = false;
      if (brace && ':' == this.lookahead(i).type) return true;

      // '}' preceded by a space is considered a selector.
      // for example "foo{bar}{baz}" may be a property,
      // however "foo{bar} {baz}" is a selector
      if ('space' == this.lookahead(i).type
        && '{' == this.lookahead(i + 1).type)
        return true;

      // Assume pseudo selectors are NOT properties
      // as 'td:th-child(1)' may look like a property
      // and function call to the parser otherwise
      if (':' == this.lookahead(i++).type
        && this.isPseudoSelector(i))
        return true;

      if (',' == this.lookahead(i).type
        && 'newline' == this.lookahead(i + 1).type)
        return true;
    }

    // Trailing comma
    if (',' == this.lookahead(i).type
      && 'newline' == this.lookahead(i + 1).type)
      return true;

    // Trailing brace
    if ('{' == this.lookahead(i).type
      && 'newline' == this.lookahead(i + 1).type)
      return true;

    // css-style mode, false on ; }
    if (this.css) {
      if (';' == this.lookahead(i) ||
          '}' == this.lookahead(i))
        return false;
    }

    // Trailing separators
    while (!~[
        'indent'
      , 'outdent'
      , 'newline'
      , 'for'
      , 'if'
      , ';'
      , '}'].indexOf(this.lookahead(i).type))
      ++i;

    if ('indent' == this.lookahead(i).type)
      return true;
  },

  /**
   * Check if the current state supports selectors.
   */

  stateAllowsSelector: function() {
    switch (this.currentState()) {
      case 'root':
      case 'selector':
      case 'conditional':
      case 'keyframe':
      case 'function':
      case 'font-face':
      case 'media':
      case 'for':
        return true;
    }
  },

  /**
   *   statement
   * | statement 'if' expression
   * | statement 'unless' expression
   */
  
  statement: function() {
    var stmt = this.stmt()
      , state = this.prevState
      , block
      , op;

    // special-case statements since it
    // is not an expression. We could
    // implement postfix conditionals at
    // the expression level, however they
    // would then fail to enclose properties
    if (this.allowPostfix) {
      delete this.allowPostfix;
      state = 'expression';
    }

    switch (state) {
      case 'assignment':
      case 'expression':
      case 'function arguments':
        while (op =
             this.accept('if')
          || this.accept('unless')
          || this.accept('for')) {
          switch (op.type) {
            case 'if':
            case 'unless':
              stmt = new nodes.If(this.expression(), stmt);
              stmt.postfix = true;
              stmt.negate = 'unless' == op.type;
              this.accept(';');
              break;
            case 'for':
              var key
                , val = this.id().name;
              if (this.accept(',')) key = this.id().name;
              this.expect('in');
              var each = new nodes.Each(val, key, this.expression());
              block = new nodes.Block;
              block.push(stmt);
              each.block = block;
              stmt = each;
          }
        }
    }

    return stmt;
  },
  
  /**
   *    ident
   *  | selector
   *  | literal
   *  | charset
   *  | import
   *  | media
   *  | scope
   *  | keyframes
   *  | page
   *  | for
   *  | if
   *  | unless
   *  | comment
   *  | expression
   *  | 'return' expression
   */
  
  stmt: function() {
    var type = this.peek().type;
    switch (type) {
      case '-webkit-keyframes':
      case 'keyframes':
        return this.keyframes();
      case 'font-face':
        return this.fontface();
      case 'comment':
      case 'selector':
      case 'literal':
      case 'charset':
      case 'media':
      case 'page':
      case 'ident':
      case 'scope':
      case 'unless':
        return this[type]();
      case 'function':
        return this.fun();
      case 'import':
        return this.atimport();
      case 'if':
        return this.ifstmt();
      case 'for':
        return this.forin();
      case 'return':
        return this.ret();
      case '{':
        return this.property();
      default:
        // Contextual selectors
        if (this.stateAllowsSelector()) {
          switch (type) {
            case 'color':
            case '~':
            case '+':
            case '>':
            case '<':
            case ':':
            case '&':
            case '[':
              return this.selector();
            case '*':
              return this.property();
            case '-':
              if ('{' == this.lookahead(2).type)
                return this.property();
          }
        }

        // Expression fallback
        var expr = this.expression();
        if (expr.isEmpty) this.error('unexpected {peek}');
        return expr;
    }
  },
  
  /**
   * indent (!outdent)+ outdent
   */

  block: function(node, scope) {
    var delim
      , stmt
      , _ = this.css
      , block = this.parent = new nodes.Block(this.parent, node);

    if (false === scope) block.scope = false;

    // css-style
    if (this.css = this.accept('{')) {
      delim = '}';
      this.skipWhitespace();
    } else {
      delim = 'outdent';
      this.expect('indent');
    }

    while (delim != this.peek().type) {
      // css-style
      if (this.css) {
        if (this.accept('newline')) continue;
        stmt = this.statement();
        this.accept(';');
        this.skipWhitespace();
      } else {
        if (this.accept('newline')) continue;
        stmt = this.statement();
        this.accept(';');
      }
      if (!stmt) this.error('unexpected token {peek} in block');
      block.push(stmt);
    }

    // css-style
    if (this.css) {
      this.skipWhitespace();
      this.expect('}');
      this.skipSpaces();
      this.css = _;
    } else {
      this.expect('outdent');
    }

    this.parent = block.parent;
    return block;
  },

  /**
   * comment space*
   */

  comment: function(){
    var node = this.next().val;
    this.skipSpaces();
    return node;
  },

  /**
   * for val (',' key) in expr
   */
  
  forin: function() {
    this.expect('for');
    var key
      , val = this.id().name;
    if (this.accept(',')) key = this.id().name;
    this.expect('in');
    var each = new nodes.Each(val, key, this.expression());
    this.state.push('for');
    each.block = this.block(each, false);
    this.state.pop();
    return each;
  },
  
  /**
   * return expression
   */
  
  ret: function() {
    this.expect('return');
    var expr = this.expression();
    return expr.isEmpty
      ? new nodes.Return
      : new nodes.Return(expr);
  },
  
  /**
   * unless expression block
   */
  
  unless: function() {
    this.expect('unless');
    var node = new nodes.If(this.expression(), true);
    this.state.push('conditional');
    node.block = this.block(node, false);
    this.state.pop();
    return node;
  },
  
  /**
   * if expression block (else block)?
   */

  ifstmt: function() {
    this.expect('if');
    var node = new nodes.If(this.expression());
    this.state.push('conditional');
    node.block = this.block(node, false);
    while (this.accept('else')) {
      if (this.accept('if')) {
        var cond = this.expression()
          , block = this.block(node, false);
        node.elses.push(new nodes.If(cond, block));
      } else {
        node.elses.push(this.block(node, false));
        break;
      }
    }
    this.state.pop();
    return node;
  },

  /**
   * scope
   */

  scope: function(){
    var val = this.expect('scope').val;
    this.selectorScope = val;
    return nodes.nil;
  },

  /**
   * media
   */
  
  media: function() {
    var val = this.expect('media').val
      , media = new nodes.Media(val);
    this.state.push('media');
    media.block = this.block(media);
    this.state.pop();
    return media;
  },

  /**
   * fontface
   */
  
  fontface: function() {
    this.expect('font-face');
    var node = new nodes.FontFace;
    this.state.push('font-face');
    node.block = this.block(node);
    this.state.pop();
    return node;
  },

  /**
   * import expression
   */
   
  atimport: function() {
    this.expect('import');
    this.allowPostfix = true;
    return new nodes.Import(this.expression());
  },
  
  /**
   * charset string
   */
  
  charset: function() {
    this.expect('charset');
    var str = this.expect('string').val;
    this.allowPostfix = true;
    return new nodes.Charset(str);
  },
  
  /**
   * page selector? block
   */

  page: function() {
    var selector;
    this.expect('page');
    if (this.accept(':')) {
      var str = this.expect('ident').val.name;
      selector = new nodes.Literal(':' + str);
    }
    var page = new nodes.Page(selector);
    this.state.push('page');
    page.block = this.block(page);
    this.state.pop();
    return page;
  },

  /**
   * keyframes name ((unit | from | to) block)+
   */
   
  keyframes: function() {
    var pos
      , _ = this.css
      , tok = this.expect('keyframes')
      , keyframes = new nodes.Keyframes(this.id(), tok.val);

    // css-style
    if (this.css = this.accept('{')) {
      this.skipWhitespace();
    } else {
      this.expect('indent');
    }

    while (pos = this.accept('unit') || this.accept('ident')) {
      // from | to
      if ('ident' == pos.type) {
        this.accept('space');
        switch (pos.val.name) {
          case 'from':
            pos = new nodes.Unit(0, '%');
            break;
          case 'to':
            pos = new nodes.Unit(100, '%');
            break;
          default:
            this.error('"' + pos.val.name + '" is invalid, use "from" or "to"');
        }
      } else {
        pos = pos.val;
      }

      // block
      this.state.push('keyframe');
      var block = this.block(keyframes);
      keyframes.push(pos, block);
      this.state.pop();
      if (this.css) this.skipWhitespace();
    }

    // css-style
    if (this.css) {
      this.skipWhitespace();
      this.expect('}');
      this.css = _;
    } else {
      this.expect('outdent');
    }

    return keyframes;
  },
  
  /**
   * literal
   */
  
  literal: function() {
    return this.expect('literal').val;
  },
  
  /**
   * ident space?
   */
  
  id: function() {
    var tok = this.expect('ident');
    this.accept('space');
    return tok.val;
  },
  
  /**
   *   ident
   * | assignment
   * | property
   * | selector
   */
  
  ident: function() {
    var i = 2
      , la = this.lookahead(i).type;

    while ('space' == la) la = this.lookahead(++i).type;

    switch (la) {
      // Assignment
      case '=':
      case '?=':
      case '-=':
      case '+=':
      case '*=':
      case '/=':
      case '%=':
        return this.assignment();
      // Assignment []=
      case '[':
        if (this._ident == this.peek()) return this.id();
        while (']' != this.lookahead(i++).type
          && 'selector' != this.lookahead(i).type) ;
        if ('=' == this.lookahead(i).type) {
          this._ident = this.peek();
          return this.expression();
        } else if (this.looksLikeSelector() && this.stateAllowsSelector()) {
          return this.selector();
        }
      // Operation
      case '-':
      case '+':
      case '/':
      case '*':
      case '%':
      case '**':
      case 'and':
      case 'or':
      case '&&':
      case '||':
      case '>':
      case '<':
      case '>=':
      case '<=':
      case '!=':
      case '==':
      case '?':
      case 'in':
      case 'is a':
      case 'is defined':
        // Prevent cyclic .ident, return literal
        if (this._ident == this.peek()) {
          return this.id();
        } else {
          this._ident = this.peek();
          switch (this.currentState()) {
            // unary op or selector in property / for
            case 'for':
            case 'selector':
              return this.property();
            // Part of a selector
            case 'root':
            case 'media':
            case 'font-face':
              return this.selector();
            // Do not disrupt the ident when an operand
            default:
              return this.operand
                ? this.id()
                : this.expression();
          }
        }
      // Selector or property
      default:
        switch (this.currentState()) {
          case 'root':
            return this.selector();
          case 'for':
          case 'page':
          case 'media':
          case 'font-face':
          case 'selector':
          case 'function':
          case 'keyframe':
          case 'conditional':
            return this.property();
          default:
            return this.id();
        }
    }
  },
  
  /**
   * '*'? (ident | '{' expression '}')+
   */
  
  interpolate: function() {
    var node
      , segs = []
      , star;

    star = this.accept('*');
    if (star) segs.push(new nodes.Literal('*'));

    while (true) {
      if (this.accept('{')) {
        this.state.push('interpolation');
        segs.push(this.expression());
        this.expect('}');
        this.state.pop();
      } else if (node = this.accept('-')){
        segs.push(new nodes.Literal('-'));
      } else if (node = this.accept('ident')){
        segs.push(node.val);
      } else {
        break;
      }
    }
    if (!segs.length) this.expect('ident');
    return segs;
  },
  
  /**
   *   property ':'? expression
   * | ident
   */

  property: function() {
    if (this.looksLikeSelector()) return this.selector();

    // property
    var ident = this.interpolate()
      , ret = prop = new nodes.Property(ident);

    // optional ':'
    this.accept('space');
    if (this.accept(':')) this.accept('space');

    this.state.push('property');
    this.inProperty = true;
    prop.expr = this.list();
    if (prop.expr.isEmpty) ret = ident[0];
    this.inProperty = false;
    this.allowPostfix = true;
    this.state.pop();

    // optional ';'
    this.accept(';');

    return ret;
  },
  
  /**
   *   selector ',' selector
   * | selector newline selector
   * | selector block
   */

  selector: function() {
    var tok
      , arr
      , group = new nodes.Group
      , scope = this.selectorScope
      , isRoot = 'root' == this.currentState();

    do {
      arr = [];

      // Clobber newline after ,
      this.accept('newline');

      // Selector candidates,
      // stitched together to
      // form a selector.
      while (tok = this.selectorToken()) {
        // Selector component
        switch (tok.type) {
          case '{':
            this.skipSpaces();
            var expr = this.expression();
            this.skipSpaces();
            this.expect('}');
            arr.push(expr);
            break;
          case 'comment':
            arr.push(new nodes.Literal(tok.val.str));
            break;
          case 'color':
            arr.push(new nodes.Literal(tok.val.raw));
            break;
          case 'space':
            arr.push(new nodes.Literal(' '));
            break;
          case 'function':
            arr.push(new nodes.Literal(tok.val.name + '('));
            break;
          case 'ident':
            arr.push(new nodes.Literal(tok.val.name));
            break;
          default:
            arr.push(new nodes.Literal(tok.val));
            if (tok.space) arr.push(new nodes.Literal(' '));
        }
      }

      // Push the selector
      if (isRoot && scope) arr.unshift(new nodes.Literal(scope + ' '));
      group.push(new nodes.Selector(arr));
    } while (this.accept(',') || this.accept('newline'));

    this.lexer.allowComments = false;
    this.state.push('selector');
    group.block = this.block(group);
    this.state.pop();


    return group;
  },
  
  /**
   * ident ('=' | '?=') expression
   */
  
  assignment: function() {
    var op
      , node
      , name = this.id().name;

    if (op =
         this.accept('=')
      || this.accept('?=')
      || this.accept('+=')
      || this.accept('-=')
      || this.accept('*=')
      || this.accept('/=')
      || this.accept('%=')) {
      this.state.push('assignment');
      var expr = this.list();
      if (expr.isEmpty) this.error('invalid right-hand side operand in assignment, got {peek}')
      node = new nodes.Ident(name, expr);
      this.state.pop();

      switch (op.type) {
        case '?=':
          var defined = new nodes.BinOp('is defined', node)
            , lookup = new nodes.Ident(name);
          node = new nodes.Ternary(defined, lookup, node);
          break;
        case '+=':
        case '-=':
        case '*=':
        case '/=':
        case '%=':
          node.val = new nodes.BinOp(op.type[0], new nodes.Ident(name), expr);
          break;
      }
    }

    return node;
  },
  
  /**
   *   definition
   * | call
   */
  
  fun: function() {
    var parens = 1
      , i = 2
      , tok;

    // Lookahead and determine if we are dealing
    // with a function call or definition. Here
    // we pair parens to prevent false negatives
    out:
    while (tok = this.lookahead(i++)) {
      switch (tok.type) {
        case 'function':
        case '(':
          ++parens;
          break;
        case ')':
          if (!--parens) break out;
          break;
        case 'eos':
          this.error('failed to find closing paren ")"');
      }
    }
    
    // Definition or call
    switch (this.currentState()) {
      case 'expression':
        return this.functionCall();
      default:
        return this.looksLikeFunctionDefinition(i)
          ? this.functionDefinition()
          : this.expression();
    }
  },

  /**
   * url '(' (expression | urlchars)+ ')'
   */

  url: function() {
    this.expect('function');
    this.state.push('function arguments');
    var args = this.args();
    this.expect(')');
    this.state.pop();
    return new nodes.Call('url', args);
  },

  /**
   * ident '(' expression ')'
   */
  
  functionCall: function() {
    if ('url' == this.peek().val.name) return this.url();
    var name = this.expect('function').val.name;
    this.state.push('function arguments');
    var args = this.args();
    this.expect(')');
    this.state.pop();
    return new nodes.Call(name, args);
  },
  
  /**
   * ident '(' params ')' block
   */
  
  functionDefinition: function() {
    var name = this.expect('function').val.name;

    // params
    this.state.push('function params');
    this.skipWhitespace();
    var params = this.params();
    this.skipWhitespace();
    this.expect(')');
    this.state.pop();

    // Body
    this.state.push('function');
    var fn = new nodes.Function(name, params);
    fn.block = this.block(fn);
    this.state.pop();
    return new nodes.Ident(name, fn);
  },
  
  /**
   *   ident
   * | ident '...'
   * | ident '=' expression
   * | ident ',' ident
   */
  
  params: function() {
    var tok
      , node
      , params = new nodes.Params;
    while (tok = this.accept('ident')) {
      this.accept('space');
      params.push(node = tok.val);
      if (this.accept('...')) {
        node.rest = true;
      } else if (this.accept('=')) {
        node.val = this.expression();
      }
      this.skipWhitespace();
      this.accept(',');
      this.skipWhitespace();
    }
    return params;
  },
  
  /**
   * (ident ':')? expression (',' (ident ':')? expression)*
   */

  args: function() {
    var args = new nodes.Arguments
      , keyword;

    do {
      // keyword
      if ('ident' == this.peek().type && ':' == this.lookahead(2).type) {
        keyword = this.next().val.string;
        this.expect(':');
        args.map[keyword] = this.expression();
      // arg
      } else {
        args.push(this.expression());
      }
    } while (this.accept(','));

    return args;
  },
 
  /**
   * expression (',' expression)*
   */

  list: function() {
    var node = this.expression();
    while (this.accept(',')) {
      if (node.isList) {
        list.push(this.expression());
      } else {
        var list = new nodes.Expression(true);
        list.push(node);
        list.push(this.expression());
        node = list;
      }
    }
    return node;
  },
  
  /**
   * negation+
   */

  expression: function() {
    var node
      , expr = new nodes.Expression;
    this.state.push('expression');
    while (node = this.negation()) {
      if (!node) this.error('unexpected token {peek} in expression');
      expr.push(node);
    }
    this.state.pop();
    return expr;
  },
  
  /**
   *   'not' ternary
   * | ternary
   */
  
  negation: function() {
    if (this.accept('not')) {
      return new nodes.UnaryOp('!', this.negation());
    }
    return this.ternary();
  },
  
  /**
   * logical ('?' expression ':' expression)?
   */
  
  ternary: function() {
    var node = this.logical();
    if (this.accept('?')) {
      var trueExpr = this.expression();
      this.expect(':');
      var falseExpr = this.expression();
      node = new nodes.Ternary(node, trueExpr, falseExpr);
    }
    return node;
  },
  
  /**
   * typecheck (('&&' | '||') typecheck)*
   */
  
  logical: function() {
    var op
      , node = this.typecheck();
    while (op = this.accept('&&') || this.accept('||')) {
      node = new nodes.BinOp(op.type, node, this.typecheck());
    }
    return node;
  },
  
  /**
   * equality ('is a' equality)*
   */
  
  typecheck: function() {
    var op
      , node = this.equality();
    while (op = this.accept('is a')) {
      this.operand = true;
      if (!node) this.error('illegal unary "' + op + '", missing left-hand operand');
      node = new nodes.BinOp(op.type, node, this.equality());
      this.operand = false;
    }
    return node;
  },
  
  /**
   * in (('==' | '!=') in)*
   */
  
  equality: function() {
    var op
      , node = this.inop();
    while (op = this.accept('==') || this.accept('!=')) {
      this.operand = true;
      if (!node) this.error('illegal unary "' + op + '", missing left-hand operand');
      node = new nodes.BinOp(op.type, node, this.inop());
      this.operand = false;
    }
    return node;
  },

  /**
   * relational ('in' relational)*
   */

  inop: function() {
    var node = this.relational();
    while (this.accept('in')) {
      this.operand = true;
      if (!node) this.error('illegal unary "in", missing left-hand operand');
      node = new nodes.BinOp('in', node, this.relational());
      this.operand = false;
    }
    return node;
  },
  
  /**
   * range (('>=' | '<=' | '>' | '<') range)*
   */
  
  relational: function() {
    var op
      , node = this.range();
    while (op = 
         this.accept('>=')
      || this.accept('<=')
      || this.accept('<')
      || this.accept('>')
      ) {
      this.operand = true;
      if (!node) this.error('illegal unary "' + op + '", missing left-hand operand');
      node = new nodes.BinOp(op.type, node, this.range());
      this.operand = false;
    }
    return node;
  },
  
  /**
   * additive (('..' | '...') additive)*
   */
  
  range: function() {
    var op
      , node = this.additive();
    if (op = this.accept('...') || this.accept('..')) {
      this.operand = true;
      if (!node) this.error('illegal unary "' + op + '", missing left-hand operand');
      node = new nodes.BinOp(op.val, node, this.additive());
      this.operand = false;
    }
    return node;
  },
  
  /**
   * multiplicative (('+' | '-') multiplicative)*
   */
  
  additive: function() {
    var op
      , node = this.multiplicative();
    while (op = this.accept('+') || this.accept('-')) {
      this.operand = true;
      node = new nodes.BinOp(op.type, node, this.multiplicative());
      this.operand = false;
    }
    return node;
  },
  
  /**
   * defined (('**' | '*' | '/' | '%') defined)*
   */
  
  multiplicative: function() {
    var op
      , node = this.defined();
    while (op =
         this.accept('**')
      || this.accept('*')
      || this.accept('/')
      || this.accept('%')) {
      this.operand = true;
      if ('/' == op && this.inProperty && !this.parens) {
        this.stash.push(new Token('literal', new nodes.Literal('/')));
        this.operand = false;
        return node;
      } else {
        if (!node) this.error('illegal unary "' + op + '", missing left-hand operand');
        node = new nodes.BinOp(op.type, node, this.defined());
        this.operand = false;
      }
    }
    return node;
  },
  
  /**
   *    unary 'is defined'
   *  | unary
   */
  
  defined: function() {
    var node = this.unary();
    if (this.accept('is defined')) {
      if (!node) this.error('illegal unary "is defined", missing left-hand operand');
      node = new nodes.BinOp('is defined', node);
    }
    return node;
  },
  
  /**
   *   ('!' | '~' | '+' | '-') unary
   * | subscript
   */
  
  unary: function() {
    var op
      , node;
    if (op =
         this.accept('!')
      || this.accept('~')
      || this.accept('+')
      || this.accept('-')) {
      this.operand = true;
      node = new nodes.UnaryOp(op.type, this.unary());
      this.operand = false;
      return node;
    }
    return this.subscript();
  },
  
  /**
   *   primary ('[' expression ']' '='?)+
   * | primary
   */
  
  subscript: function() {
    var node = this.primary();
    while (this.accept('[')) {
      node = new nodes.BinOp('[]', node, this.expression());
      this.expect(']');
      // TODO: TernaryOp :)
      if (this.accept('=')) {
        node.op += '=';
        node.val = this.expression();
      }
    }
    return node;
  },
  
  /**
   *   unit
   * | null
   * | color
   * | string
   * | ident
   * | boolean
   * | literal
   * | '(' expression ')'
   */

  primary: function() {
    var op
      , node;

    // Parenthesis
    if (this.accept('(')) {
      ++this.parens;
      var expr = this.expression();
      this.expect(')');
      --this.parens;
      return expr;
    }

    // Primitive
    switch (this.peek().type) {
      case 'null':
      case 'unit':
      case 'color':
      case 'string':
      case 'literal':
      case 'boolean':
        return this.next().val;
      case 'ident':
        return this.ident();
      case 'function':
        return this.functionCall();
    }
  }
};


});// module: parser.js


require.register("renderer.js", function(module, exports, require){


/*!
 * Stylus - Renderer
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Parser = require('./parser')
  , Compiler = require('./visitor/compiler')
  , Evaluator = require('./visitor/evaluator')
  , utils = require('./utils')
  , nodes = require('./nodes')
  , path = require('./path')
  , join = path.join;

/**
 * Initialize a new `Renderer` with the given `str` and `options`.
 *
 * @param {String} str
 * @param {Object} options
 * @api public
 */

var Renderer = module.exports = function Renderer(str, options) {
  options = options || {};
  options.globals = {};
  options.functions = {};
  options.imports = [];
  // options.imports = [join(__dirname, 'functions')];
  options.paths = options.paths || [];
  options.filename = options.filename || 'stylus';
  this.options = options;
  this.str = str;
};

/**
 * Parse and evaluate AST, then callback `fn(err, css, js)`.
 *
 * @param {Function} fn
 * @api public
 */

Renderer.prototype.render = function(fn){
  var parser = this.parser = new Parser(this.str, this.options);
  try {
    nodes.filename = this.options.filename;
    var ast = parser.parse();
    this.evaluator = new Evaluator(ast, this.options);
    ast = this.evaluator.evaluate();
    var compiler = new Compiler(ast, this.options)
      , css = compiler.compile()
      , js = compiler.js;
    fn(null, css, js);
  } catch (err) {
  //   var options = {};
  //   options.input = err.input || this.str;
  //   options.filename = err.filename || this.options.filename;
  //   options.lineno = err.lineno || parser.lexer.lineno;
  //   fn(utils.formatException(err, options));
    fn(err);
  }
};

/**
 * Set option `key` to `val`.
 *
 * @param {String} key
 * @param {Mixed} val
 * @return {Renderer} for chaining
 * @api public
 */

Renderer.prototype.set = function(key, val){
  this.options[key] = val;
  return this;
};

/**
 * Get option `key`.
 *
 * @param {String} key
 * @return {Mixed} val
 * @api public
 */

Renderer.prototype.get = function(key){
  return this.options[key];
};

/**
 * Include the given `path` to the lookup paths array.
 *
 * @param {String} path
 * @return {Renderer} for chaining
 * @api public
 */

Renderer.prototype.include = function(path){
  this.options.paths.push(path);
  return this;
};

/**
 * Use the given `fn`.
 *
 * This allows for plugins to alter the renderer in
 * any way they wish, exposing paths etc.
 *
 * @param {Function}
 * @return {Renderer} for chaining
 * @api public
 */

Renderer.prototype.use = function(fn){
  fn.call(this, this);
  return this;
};

/**
 * Define function or global var with the given `name`. Optionally
 * the function may accept full expressions, by setting `raw`
 * to `true`.
 *
 * @param {String} name
 * @param {Function|Node} fn
 * @return {Renderer} for chaining
 * @api public
 */

Renderer.prototype.define = function(name, fn, raw){
  if (fn.nodeName) {
    this.options.globals[name] = fn;
    return this;
  }

  // function
  this.options.functions[name] = fn;
  if (undefined != raw) fn.raw = raw;
  return this;
};

// /**
//  * Import the given `file`.
//  *
//  * @param {String} file
//  * @return {Renderer} for chaining
//  * @api public
//  */
// 
// Renderer.prototype.import = function(file){
//   this.options.imports.push(file);
//   return this;
// };




});// module: renderer.js


require.register("stack/index.js", function(module, exports, require){


/*!
 * Stylus - Stack
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Frame = require('./frame');

/**
 * Initialize a new `Stack`.
 *
 * @api private
 */

var Stack = module.exports = function Stack() {
  Array.apply(this, arguments);
};

/**
 * Inherit from `Array.prototype`.
 */

Stack.prototype.__proto__ = Array.prototype;

/**
 * Push the given `frame`.
 *
 * @param {Frame} frame
 * @api public
 */

Stack.prototype.push = function(frame){
  frame.stack = this;
  frame.parent = this.currentFrame;
  return [].push.apply(this, arguments);
};

/**
 * Return the current stack `Frame`.
 *
 * @return {Frame}
 * @api private
 */

Stack.prototype.__defineGetter__('currentFrame', function(){
  return this[this.length - 1];
});

/**
 * Lookup stack frame for the given `block`.
 *
 * @param {Block} block
 * @return {Frame}
 * @api private
 */

Stack.prototype.getBlockFrame = function(block){
  for (var i = 0; i < this.length; ++i) {
    if (block == this[i].block) {
      return this[i];
    }
  }
};

/**
 * Lookup the given local variable `name`, relative
 * to the lexical scope of the current frame's `Block`.
 *
 * When the result of a lookup is an identifier
 * a recursive lookup is performed, defaulting to
 * returning the identifier itself.
 *
 * @param {String} name
 * @return {Node}
 * @api private
 */

Stack.prototype.lookup = function(name){
  var block = this.currentFrame.block
    , val
    , ret;

  do {
    var frame = this.getBlockFrame(block);
    if (frame && (val = frame.lookup(name))) {
      switch (val.first.nodeName) {
        case 'ident':
          return this.lookup(val.first.name) || val;
        default:
          return val;
      }
    }
  } while (block = block.parent);
};

/**
 * Custom inspect.
 *
 * @return {String}
 * @api private
 */

Stack.prototype.inspect = function(){
  return this.reverse().map(function(frame){
    return frame.inspect();
  }).join('\n');
};

/**
 * Return stack string formatted as:
 *
 *   at <context> (<filename>:<lineno>)
 *
 * @return {String}
 * @api private
 */

Stack.prototype.toString = function(){
  var block
    , node
    , buf = []
    , location
    , len = this.length;

  while (len--) {
    block = this[len].block;
    if (node = block.node) {
      location = '(' + node.filename + ':' + (node.lineno + 1) + ')';
      switch (node.nodeName) {
        case 'function':
          buf.push('    at ' + node.name + '() ' + location);
          break;
        case 'group':
          buf.push('    at "' + node.nodes[0].val + '" ' + location);
          break;
      }
    }
  }

  return buf.join('\n');
};

});// module: stack/index.js


require.register("stack/frame.js", function(module, exports, require){


/*!
 * Stylus - stack - Frame
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Scope = require('./scope')
  , blocks = require('../nodes');

/**
 * Initialize a new `Frame` with the given `block`.
 *
 * @param {Block} block
 * @api private
 */

var Frame = module.exports = function Frame(block) {
  this._scope = false === block.scope
    ? null
    : new Scope;
  this.block = block;
};

/**
 * Return this frame's scope or the parent scope
 * for scope-less blocks.
 *
 * @return {Scope}
 * @api public
 */

Frame.prototype.__defineGetter__('scope', function(){
  return this._scope || this.parent.scope;
});

/**
 * Lookup the given local variable `name`.
 *
 * @param {String} name
 * @return {Node}
 * @api private
 */

Frame.prototype.lookup = function(name){
  return this.scope.lookup(name)
};

/**
 * Custom inspect.
 *
 * @return {String}
 * @api public
 */

Frame.prototype.inspect = function(){
  return '[Frame '
    + (false === this.block.scope
        ? 'scope-less'
        : this.scope.inspect())
    + ']';
};


});// module: stack/frame.js


require.register("stack/scope.js", function(module, exports, require){


/*!
 * Stylus - stack - Scope
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Initialize a new `Scope`.
 *
 * @api private
 */

var Scope = module.exports = function Scope() {
  this.locals = {};
};

/**
 * Add `ident` node to the current scope.
 *
 * @param {Ident} ident
 * @api private
 */

Scope.prototype.add = function(ident){
  this.locals[ident.name] = ident.val;
};

/**
 * Lookup the given local variable `name`.
 *
 * @param {String} name
 * @return {Node}
 * @api private
 */

Scope.prototype.lookup = function(name){
  return this.locals[name];
};

/**
 * Custom inspect.
 *
 * @return {String}
 * @api public
 */

Scope.prototype.inspect = function(){
  var keys = Object.keys(this.locals).map(function(key){ return '@' + key; });
  return '[Scope'
    + (keys.length ? ' ' + keys.join(', ') : '')
    + ']';
};


});// module: stack/scope.js


require.register("stylus.js", function(module, exports, require){


/*!
 * Stylus
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Renderer = require('./renderer')
  , Parser = require('./parser')
  , nodes = require('./nodes')
  , utils = require('./utils');

/**
 * Export render as the module.
 */

exports = module.exports = render;

/**
 * Library version.
 */

exports.version = '0.16.0';

/**
 * Expose nodes.
 */

exports.nodes = nodes;

/**
 * Expose BIFs.
 */

exports.functions = require('./functions');

/**
 * Expose utils.
 */

exports.utils = require('./utils');

/**
 * Expose constructors.
 */

exports.Visitor = require('./visitor');
exports.Parser = require('./parser');
exports.Evaluator = require('./visitor/evaluator');

/**
 * Render the given `str` with `options` and callback `fn(err, css)`.
 *
 * @param {String} str
 * @param {Object|Function} options
 * @param {Function} fn
 * @api public
 */

exports.render = function(str, options, fn){
  if ('function' == typeof options) fn = options, options = {};
  new Renderer(str, options).render(fn);
};

/**
 * Return a new `Renderer` for the given `str` and `options`.
 *
 * @param {String} str
 * @param {Object} options
 * @return {Renderer}
 * @api public
 */

function render(str, options) {
  str = bifs + str;
  return new Renderer(str, options);
}

/**
 * Expose optional functions.
 */

exports.url = require('./functions/url');


});// module: stylus.js


require.register("token.js", function(module, exports, require){


/*!
 * Stylus - Token
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Initialize a new `Token` with the given `type` and `val`.
 *
 * @param {String} type
 * @param {Mixed} val
 * @api private
 */

var Token = exports = module.exports = function Token(type, val) {
  this.type = type;
  this.val = val;
};

/**
 * Custom inspect.
 *
 * @return {String}
 * @api public
 */

Token.prototype.inspect = function(){
  var val = ' ' + this.val;
  return '[Token:' + this.lineno + ' '
    + '\x1b[32m' + this.type + '\x1b[0m'
    + '\x1b[33m' + (this.val ? val : '') + '\x1b[0m'
    + ']';
};

/**
 * Return type or val.
 *
 * @return {String}
 * @api public
 */

Token.prototype.toString = function(){
  return (undefined === this.val
    ? this.type
    : this.val).toString();
};


});// module: token.js


require.register("utils.js", function(module, exports, require){


/*!
 * Stylus - utils
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var nodes = require('./nodes')
  , join = require('./path').join;

/**
 * Check if `path` looks absolute.
 *
 * @param {String} path
 * @return {Boolean}
 * @api private
 */

exports.absolute = function(path){
  return /^([a-z]:\\)|\//i.test(path);
};

/**
 * Attempt to lookup `path` within `paths` from tail to head.
 * Optionally a path to `ignore` may be passed.
 *
 * @param {String} path
 * @param {String} paths
 * @param {String} ignore
 * @return {String}
 * @api private
 */

exports.lookup = function(path, paths, ignore){
  var lookup
    , i = paths.length;

  // Absolute
  if (exports.absolute(path)) {
    try {
      // fs.statSync(path);
      return path;
    } catch (err) {
      // Ignore, continue on
      // to trying relative lookup.
      // Needed for url(/images/foo.png)
      // for example
    }
  }

  // Relative
  while (i--) {
    try {
      lookup = join(paths[i], path);
      if (ignore == lookup) continue;
      // fs.statSync(lookup);
      return lookup;
    } catch (err) {
      // Ignore
    }
  }
};

/**
 * Format the given `err` with the given `options`.
 *
 * Options:
 *
 *   - `filename`   context filename
 *   - `context`    context line count [8]
 *   - `lineno`     context line number
 *   - `input`        input string
 *
 * @param {Error} err
 * @param {Object} options
 * @return {Error}
 * @api private
 */

exports.formatException = function(err, options){
  var lineno = options.lineno
    , filename = options.filename
    , str = options.input
    , context = options.context || 8
    , context = context / 2
    , lines = ('\n' + str).split('\n')
    , start = Math.max(lineno - context, 1)
    , end = Math.min(lines.length, lineno + context)
    , pad = end.toString().length;

  var context = lines.slice(start, end).map(function(line, i){
    var curr = i + start;
    return (curr == lineno ? ' > ' : '   ')
      + Array(pad - curr.toString().length + 1).join(' ')
      + curr
      + '| '
      + line;
  }).join('\n');

  err.message = filename
    + ':' + lineno
    + '\n' + context
    + '\n\n' + err.message + '\n'
    + (err.stylusStack ? err.stylusStack + '\n' : '');

  return err;
};

/**
 * Assert that `node` is of the given `type`, or throw.
 *
 * @param {Node} node
 * @param {Function} type
 * @param {String} param
 * @api public
 */

exports.assertType = function(node, type, param){
  exports.assertPresent(node, param);
  if (node.nodeName == type) return;
  var actual = node.nodeName
    , msg = 'expected "'
      + param + '" to be a '
      + type + ', but got '
      + actual + ':' + node;
  throw new Error('TypeError: ' + msg);
};

/**
 * Assert that `node` is a `String` or `Ident`.
 *
 * @param {Node} node
 * @param {String} param
 * @api public
 */

exports.assertString = function(node, param){
  exports.assertPresent(node, param);
  switch (node.nodeName) {
    case 'string':
    case 'ident':
    case 'literal':
      return;
    default:
      var actual = node.nodeName
        , msg = 'expected string, ident or literal, but got ' + actual + ':' + node;
      throw new Error('TypeError: ' + msg);
  }
};

/**
 * Assert that `node` is a `RGBA` or `HSLA`.
 *
 * @param {Node} node
 * @param {String} param
 * @api public
 */

exports.assertColor = function(node, param){
  exports.assertPresent(node, param);
  switch (node.nodeName) {
    case 'rgba':
    case 'hsla':
      return;
    default:
      var actual = node.nodeName
        , msg = 'expected rgba or hsla, but got ' + actual + ':' + node;
      throw new Error('TypeError: ' + msg);
  }
};

/**
 * Assert that param `name` is given, aka the `node` is passed.
 *
 * @param {Node} node
 * @param {String} name
 * @api public
 */

exports.assertPresent = function(node, name){
  if (node) return;
  if (name) throw new Error('"' + name + '" argument required');
  throw new Error('argument missing');
};

/**
 * Unwrap `expr`.
 *
 * Takes an expressions with length of 1
 * such as `((1 2 3))` and unwraps it to `(1 2 3)`.
 *
 * @param {Expression} expr
 * @return {Node}
 * @api public
 */

exports.unwrap = function(expr){
  // explicitly preserve the expression
  if (expr.preserve) return expr;
  if ('arguments' != expr.nodeName && 'expression' != expr.nodeName) return expr;
  if (1 != expr.nodes.length) return expr;
  if ('arguments' != expr.nodes[0].nodeName && 'expression' != expr.nodes[0].nodeName) return expr;
  return exports.unwrap(expr.nodes[0]);
};

/**
 * Return param names for `fn`.
 *
 * @param {Function} fn
 * @return {Array}
 * @api private
 */

exports.params = function(fn){
  return fn
    .toString()
    .match(/\(([^)]*)\)/)[1].split(/ *, */);
};

/**
 * Merge object `b` with `a`.
 *
 * @param {Object} a
 * @param {Object} b
 * @return {Object} a
 * @api private
 */

exports.merge = function(a, b){
  for (var k in b) a[k] = b[k];
  return a;
}


});// module: utils.js


require.register("visitor/index.js", function(module, exports, require){


/*!
 * Stylus - Visitor
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Initialize a new `Visitor` with the given `root` Node.
 *
 * @param {Node} root
 * @api private
 */

var Visitor = module.exports = function Visitor(root) {
  this.root = root;
};

/**
 * Visit the given `node`.
 *
 * @param {Node|Array} node
 * @api public
 */

Visitor.prototype.visit = function(node, fn){
  var method = 'visit' + node.constructor.name;
  if (this[method]) return this[method](node);
  return node;
};



});// module: visitor/index.js


require.register("visitor/compiler.js", function(module, exports, require){


/*!
 * Stylus - Compiler
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Visitor = require('./index')
  , nodes = require('../nodes');

/**
 * Initialize a new `Compiler` with the given `root` Node
 * and the following `options`.
 *
 * Options:
 *
 *   - `compress`  Compress the css output, defaults to false
 *
 * @param {Node} root
 * @api public
 */

var Compiler = module.exports = function Compiler(root, options) {
  options = options || {};
  this.compress = options.compress;
  this.firebug = options.firebug;
  this.linenos = options.linenos;
  this.indents = 1;
  Visitor.call(this, root);
  this.tree = [];
  this.js = '';
};

/**
 * Inherit from `Visitor.prototype`.
 */

Compiler.prototype.__proto__ = Visitor.prototype;

/**
 * Compile to css, and return a string of CSS.
 *
 * @return {String}
 * @api private
 */

Compiler.prototype.compile = function(){
  return this.visit(this.root);
};

/**
 * Return indentation string.
 *
 * @return {String}
 * @api private
 */

Compiler.prototype.__defineGetter__('indent', function(){
  return this.compress
     ? ''
     : new Array(this.indents).join('  ');
});

/**
 * Visit Root.
 */

Compiler.prototype.visitRoot = function(block){
  this.buf = '';
  for (var i = 0, len = block.nodes.length; i < len; ++i) {
    var node = block.nodes[i];
    switch (node.nodeName) {
      case 'null':
      case 'expression':
      case 'function':
      case 'jsliteral':
      case 'unit':
        continue;
      default:
        var ret = this.visit(node);
        if (ret) this.buf += ret + '\n';
    }
  }
  return this.buf;
};

/**
 * Visit Block.
 */

Compiler.prototype.visitBlock = function(block){
  var node;

  if (block.hasProperties) {
    var arr = [this.compress ? '{' : ' {'];
    ++this.indents;
    for (var i = 0, len = block.nodes.length; i < len; ++i) {
      this.last = len - 1 == i;
      node = block.nodes[i];
      switch (node.nodeName) {
        case 'null':
        case 'expression':
        case 'function':
        case 'jsliteral':
        case 'group':
        case 'unit':
          continue;
        default:
          arr.push(this.visit(node));
      } 
    }
    --this.indents;
    arr.push(this.indent + '}');
    this.buf += arr.join(this.compress ? '' : '\n');
    this.buf += '\n';
  }

  // Nesting
  for (var i = 0, len = block.nodes.length; i < len; ++i) {
    node = block.nodes[i];
    switch (node.nodeName) {
      case 'group':
      case 'print':
      case 'page':
      case 'block':
      case 'keyframes':
        if (this.linenos || this.firebug) this.debugInfo(node);
        this.visit(node);
        break;
      case 'media':
      case 'import':
      case 'fontface':
        this.visit(node);
        break;
    }
  }
};

/**
 * Visit Keyframes.
 */

Compiler.prototype.visitKeyframes = function(node){
  var prefix = 'official' == node.prefix
    ? ''
    : '-' + node.prefix + '-';

  this.buf += '@' + prefix + 'keyframes '
    + this.visit(node.name)
    + (this.compress ? '{' : ' {');
  ++this.indents;
  node.frames.forEach(function(frame){
    if (!this.compress) this.buf += '\n  ';
    this.buf += this.visit(frame.pos);
    this.visit(frame.block);
  }, this);
  --this.indents;
  this.buf += '}' + (this.compress ? '' : '\n');
};

/**
 * Visit Media.
 */

Compiler.prototype.visitMedia = function(media){
  this.buf += '@media ' + media.val;
  this.buf += this.compress ? '{' : ' {\n';
  ++this.indents;
  this.visit(media.block);
  --this.indents;
  this.buf += '}' + (this.compress ? '' : '\n');
};

/**
 * Visit Page.
 */

Compiler.prototype.visitPage = function(page){
  this.buf += this.indent + '@page';
  this.buf += page.selector ? ' ' + page.selector : '';
  this.visit(page.block);
};

/**
 * Visit Import.
 */

Compiler.prototype.visitImport = function(imported){
  this.buf += '@import ' + this.visit(imported.path) + ';\n';
};

/**
 * Visit FontFace.
 */

Compiler.prototype.visitFontFace = function(face){
  this.buf += this.indent + '@font-face';
  this.visit(face.block);
};

/**
 * Visit JSLiteral.
 */

Compiler.prototype.visitJSLiteral = function(js){
  this.js += '\n' + js.val.replace(/@selector/g, '"' + this.selector + '"');
  return '';
};

/**
 * Visit Comment.
 */

Compiler.prototype.visitComment = function(comment){
  return this.compress
    ? comment.suppress
      ? ''
      : comment.str
    : comment.str;
};

/**
 * Visit Function.
 */

Compiler.prototype.visitFunction = function(fn){
  return fn.name;
};

/**
 * Visit Variable.
 */

Compiler.prototype.visitVariable = function(variable){
  return '';
};

/**
 * Visit Charset.
 */

Compiler.prototype.visitCharset = function(charset){
  return '@charset ' + this.visit(charset.val) + ';';
};

/**
 * Visit Literal.
 */

Compiler.prototype.visitLiteral = function(lit){
  return lit.val.trim().replace(/^  /gm, '');
};

/**
 * Visit Boolean.
 */

Compiler.prototype.visitBoolean = function(bool){
  return bool.toString();
};

/**
 * Visit RGBA.
 */

Compiler.prototype.visitRGBA = function(rgba){
  return rgba.toString();
};

/**
 * Visit HSLA.
 */

Compiler.prototype.visitHSLA = function(hsla){
  return hsla.rgba.toString();
};

/**
 * Visit Unit.
 */

Compiler.prototype.visitUnit = function(unit){
  var type = unit.type || ''
    , n = unit.val
    , float = n != (n | 0);

  // Compress
  if (this.compress) {
    // Zero is always '0', unless when
    // a percentage, this is required by keyframes
    if ('%' != type && 0 == n) return '0';
    // Omit leading '0' on floats
    if (float && n < 1 && n > -1) {
      return n.toString().replace('0.', '.') + type;
    }
  }

  return n.toString() + type;
};

/**
 * Visit Group.
 */

Compiler.prototype.visitGroup = function(group){
  var self = this
    , tree = this.tree
    , prev = tree[tree.length - 1]
    , curr = [];

  // Construct an array of arrays
  // representing the selector hierarchy
  group.nodes.forEach(function(node){
    curr.push(node.parent
        ? node
        : node.val);
  });

  tree.push(curr);

  // Reverse recurse the
  // hierarchy array to build
  // up the selector combinations.
  // When we reach root, we have our
  // selector string built
  var selectors = []
    , buf = [];
  function join(arr, i) {
    if (i) {
      arr[i].forEach(function(str){
        buf.unshift(str);
        join(arr, i - 1);
        buf.shift();
      });
    } else {
      arr[0].forEach(function(selector){
        var str = selector.trim();
        if (buf.length) {
          for (var i = 0, len = buf.length; i < len; ++i) {
            if (~buf[i].indexOf('&')) {
              str = buf[i].replace(/&/g, str).trim();
            } else {
              str += ' ' + buf[i].trim();
            }
          }
        }
        selectors.push(self.indent + str.trimRight());
      });
    }
  }

  // Join selectors
  if (group.block.hasProperties) {
    join(tree, tree.length - 1);
    this.buf += (this.selector = selectors.join(this.compress ? ',' : ',\n'));
  }

  // Output blocks
  this.visit(group.block);
  tree.pop();
};

/**
 * Visit Ident.
 */

Compiler.prototype.visitIdent = function(ident){
  return ident.name;
};

/**
 * Visit String.
 */

Compiler.prototype.visitString = function(string){
  return this.isURL
    ? string.val
    : string.toString();
};

/**
 * Visit Null.
 */

Compiler.prototype.visitNull = function(node){
  return '';
};

/**
 * Visit Call.
 */

Compiler.prototype.visitCall = function(call){
  this.isURL = 'url' == call.name;
  var args = call.args.nodes.map(function(arg){
    return this.visit(arg);
  }, this).join(this.compress ? ',' : ', ');
  if (this.isURL) args = '"' + args + '"';
  delete this.isURL;
  return call.name + '(' + args + ')';
};

/**
 * Visit Expression.
 */

Compiler.prototype.visitExpression = function(expr){
  var buf = []
    , self = this
    , len = expr.nodes.length
    , nodes = expr.nodes.map(function(node){ return self.visit(node); });

  nodes.forEach(function(node, i){
    var last = i == len - 1;
    buf.push(node);
    if ('/' == nodes[i + 1] || '/' == node) return;
    if (last) return;
    buf.push(expr.isList
      ? (self.compress ? ',' : ', ')
      : (self.isURL ? '' : ' '));
  });

  return buf.join('');
};

/**
 * Visit Arguments.
 */

Compiler.prototype.visitArguments = Compiler.prototype.visitExpression;

/**
 * Visit Property.
 */

Compiler.prototype.visitProperty = function(prop){
  var self = this
    , val = this.visit(prop.expr);
  return this.indent + (prop.name || prop.segments.join(''))
    + (this.compress ? ':' + val : ': ' + val)
    + (this.compress
        ? (this.last ? '' : ';')
        : ';');
};


});// module: visitor/compiler.js


require.register("visitor/evaluator.js", function(module, exports, require){


/*!
 * Stylus - Evaluator
 * Copyright(c) 2010 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Visitor = require('./index')
  , nodes = require('../nodes')
  , Stack = require('../stack')
  , Frame = require('../stack/frame')
  , Scope = require('../stack/scope')
  , utils = require('../utils')
  , bifs = require('../functions')
  , dirname = require('../path').dirname
  , join = require('../path').join
  , colors = require('../colors');

/**
 * Initialize a new `Evaluator` with the given `root` Node
 * and the following `options`.
 *
 * Options:
 *
 *   - `compress`  Compress the css output, defaults to false
 *   - `warn`  Warn the user of duplicate function definitions etc
 *
 * @param {Node} root
 * @api private
 */

var Evaluator = module.exports = function Evaluator(root, options) {
  options = options || {};
  Visitor.call(this, root);
  this.stack = new Stack;
  this.imports = options.imports || [];
  this.functions = options.functions || {};
  this.globals = options.globals || {};
  this.paths = options.paths || [];
  this.filename = options.filename;
  this.paths.push(dirname(options.filename || '.'));
  this.stack.push(this.global = new Frame(root));
  this.warnings = options.warn;
  this.options = options;
  this.calling = []; // TODO: remove, use stack
  this.importStack = [];
};

/**
 * Inherit from `Visitor.prototype`.
 */

Evaluator.prototype.__proto__ = Visitor.prototype;

/**
 * Proxy visit to expose node line numbers.
 *
 * @param {Node} node
 * @return {Node}
 * @api private
 */

var visit = Visitor.prototype.visit;
Evaluator.prototype.visit = function(node){
  try {
    return visit.call(this, node);
  } catch (err) {
    if (err.filename) throw err;
    err.lineno = node.lineno;
    err.filename = node.filename;
    err.stylusStack = this.stack.toString();
    try {
      // err.input = fs.readFileSync(err.filename, 'utf8');
    } catch (err) {
      // ignore
    }
    throw err;
  }
};

/**
 * Perform evaluation setup:
 *
 *   - populate global scope
 *   - iterate imports
 *
 * @api private
 */

Evaluator.prototype.setup = function(){
  this.populateGlobalScope();
  this.imports.forEach(function(file){
    var expr = new nodes.Expression;
    expr.push(new nodes.String(file));
    this.visit(new nodes.Import(expr));
  }, this);
};

/**
 * Populate the global scope with:
 * 
 *   - css colors
 *   - user-defined globals
 * 
 * @api private
 */

Evaluator.prototype.populateGlobalScope = function(){
  var scope = this.global.scope;

  // colors
  Object.keys(colors).forEach(function(name){
    var rgb = colors[name]
      , rgba = new nodes.RGBA(rgb[0], rgb[1], rgb[2], 1)
      , node = new nodes.Ident(name, rgba);
    scope.add(node);
  });

  // user-defined globals
  var globals = this.globals;
  Object.keys(globals).forEach(function(name){
    scope.add(new nodes.Ident(name, globals[name]));
  });
};

/**
 * Evaluate the tree.
 *
 * @return {Node}
 * @api private
 */

Evaluator.prototype.evaluate = function(){
  this.setup();
  return this.visit(this.root);
};

/**
 * Visit Group.
 */

Evaluator.prototype.visitGroup = function(group){
  var vendors = this.vendors;

  group.nodes = group.nodes.map(function(selector){
    selector.val = this.interpolate(selector);
    return selector;
  }, this);

  group.block = this.visit(group.block);
  return group;
};

/**
 * Visit Charset.
 */

Evaluator.prototype.visitCharset = function(charset){
  return charset;
};

/**
 * Visit Return.
 */

Evaluator.prototype.visitReturn = function(ret){
  ret.expr = this.visit(ret.expr);
  throw ret;
};

/**
 * Visit Media.
 */

Evaluator.prototype.visitMedia = function(media){
  media.block = this.visit(media.block);
  return media;
};

/**
 * Visit Keyframes.
 */

Evaluator.prototype.visitKeyframes = function(keyframes){
  if (keyframes.fabricated) return keyframes;
  keyframes.name = this.visit(keyframes.name).first.name;

  keyframes.frames = keyframes.frames.map(function(frame){
    frame.block = this.visit(frame.block);
    return frame;
  }, this);

  if ('official' != keyframes.prefix) return keyframes;

  this.vendors.forEach(function(prefix){
    var node = keyframes.clone();
    node.prefix = prefix;
    node.fabricated = true;
    this.currentBlock.push(node);
  }, this);

  return nodes.nil;
};

/**
 * Visit Function.
 */

Evaluator.prototype.visitFunction = function(fn){
  // check local
  var local = this.stack.currentFrame.scope.lookup(fn.name);
  if (local) this.warn('local ' + local.nodeName + ' "' + fn.name + '" previously defined in this scope');

  // user-defined
  var user = this.functions[fn.name];
  if (user) this.warn('user-defined function "' + fn.name + '" is already defined');

  // BIF
  var bif = bifs[fn.name];
  if (bif) this.warn('built-in function "' + fn.name + '" is already defined');

  return fn;
};

/**
 * Visit Each.
 */

Evaluator.prototype.visitEach = function(each){
  var expr = utils.unwrap(this.visit(utils.unwrap(each.expr)))
    , len = expr.nodes.length
    , val = new nodes.Ident(each.val)
    , key = new nodes.Ident(each.key || '__index__')
    , scope = this.currentScope
    , block = this.currentBlock
    , vals = []
    , body;

  each.block.scope = false;
  for (var i = 0; i < len; ++i) {
    val.val = expr.nodes[i];
    key.val = new nodes.Unit(i);
    scope.add(val);
    scope.add(key);
    body = this.visit(each.block.clone());
    vals = vals.concat(body.nodes);
  }

  this.mixin(vals, block);
  return vals[vals.length - 1] || nodes.nil;
};

/**
 * Visit Call.
 */

Evaluator.prototype.visitCall = function(call){
  var fn = this.lookup(call.name)
    , ret;

  // url()
  this.ignoreColors = 'url' == call.name;

  // Variable function
  if (fn && 'expression' == fn.nodeName) {
    fn = fn.nodes[0];
  }

  // Not a function? try user-defined or built-ins
  if (fn && 'function' != fn.nodeName) {
    fn = this.lookupFunction(call.name);
  }

  // Undefined function, render literal css
  if (!fn || fn.nodeName != 'function') {
    var ret = this.literalCall(call);
    this.ignoreColors = false;
    return ret;
  }

  this.calling.push(call.name);

  // Massive stack
  if (this.calling.length > 200) {
    throw new RangeError('Maximum call stack size exceeded');
  }

  // First node in expression
  if ('expression' == fn.nodeName) fn = fn.first;

  // Evaluate arguments
  var _ = this.ret;
  this.ret = true;
  var args = this.visit(call.args);
  for (var key in call.args.map) {
    call.args.map[key] = this.visit(call.args.map[key]);
  }
  this.ret = _;

  // Built-in
  if (fn.fn) {
    ret = this.invokeBuiltin(fn.fn, args);
  // User-defined
  } else if ('function' == fn.nodeName) {
    ret = this.invokeFunction(fn, args);
  }

  this.calling.pop();
  this.ignoreColors = false;
  return ret;
};

/**
 * Visit Ident.
 */

Evaluator.prototype.visitIdent = function(ident){
  var prop;
  // Property lookup
  if (ident.property) {
    if (prop = this.lookupProperty(ident.name)) {
      return this.visit(prop.expr.clone());
    }
    return nodes.nil;
  // Lookup
  } else if (ident.val.isNull) {
    var val = this.lookup(ident.name);
    return val ? this.visit(val) : ident;
  // Assign  
  } else {
    var _ = this.ret;
    this.ret = true;
    ident.val = this.visit(ident.val);
    this.ret = _;
    this.currentScope.add(ident);
    return ident.val;
  }
};

/**
 * Visit BinOp.
 */

Evaluator.prototype.visitBinOp = function(binop){
  // Special-case "is defined" pseudo binop
  if ('is defined' == binop.op) return this.isDefined(binop.left);

  var _ = this.ret;
  this.ret = true;
  // Visit operands
  var op = binop.op
    , left = this.visit(binop.left)
    , right = this.visit(binop.right);
  this.ret = _;

  // HACK: ternary
  var val = binop.val
    ? this.visit(binop.val)
    : null;

  // Operate
  try {
    return this.visit(left.operate(op, right, val));
  } catch (err) {
    // disregard coercion issues in equality
    // checks, and simply return false
    if ('CoercionError' == err.name) {
      switch (op) {
        case '==':
          return nodes.no;
        case '!=':
          return nodes.yes;
      }
    }
    throw err;
  }
};

/**
 * Visit UnaryOp.
 */

Evaluator.prototype.visitUnaryOp = function(unary){
  var op = unary.op
    , node = this.visit(unary.expr);

  if ('!' != op) {
    node = node.first.clone();
    utils.assertType(node, 'unit');
  }

  switch (op) {
    case '-':
      node.val = -node.val;
      break;
    case '+':
      node.val = +node.val;
      break;
    case '~':
      node.val = ~node.val;
      break;
    case '!':
      return node.toBoolean().negate();
  }

  return node;
};

/**
 * Visit TernaryOp.
 */

Evaluator.prototype.visitTernary = function(ternary){
  var ok = this.visit(ternary.cond).toBoolean();
  return ok.isTrue
    ? this.visit(ternary.trueExpr)
    : this.visit(ternary.falseExpr);
};

/**
 * Visit Expression.
 */

Evaluator.prototype.visitExpression = function(expr){
  for (var i = 0, len = expr.nodes.length; i < len; ++i) {
    expr.nodes[i] = this.visit(expr.nodes[i]);
  }
  return expr;
};

/**
 * Visit Arguments.
 */

Evaluator.prototype.visitArguments = Evaluator.prototype.visitExpression;

/**
 * Visit Property.
 */

Evaluator.prototype.visitProperty = function(prop){
  var name = this.interpolate(prop)
    , fn = this.lookup(name)
    , call = fn && 'function' == fn.nodeName
    , literal = ~this.calling.indexOf(name);

  // Function of the same name
  if (call && !literal && !prop.literal) {
    this.calling.push(name);
    var args = nodes.Arguments.fromExpression(utils.unwrap(prop.expr));
    var ret = this.visit(new nodes.Call(name, args));
    this.calling.pop();
    return ret;
  // Regular property
  } else {
    var _ = this.ret;
    this.ret = true;
    prop.name = name;
    prop.literal = true;
    this.property = prop;
    prop.expr = this.visit(prop.expr);
    delete this.property;
    this.ret = _;
    return prop;
  }
};

/**
 * Visit Root.
 */

Evaluator.prototype.visitRoot = function(block){
  for (var i = 0; i < block.nodes.length; ++i) {
    block.index = this.rootIndex = i;
    block.nodes[i] = this.visit(block.nodes[i]);
  }
  return block;
};

/**
 * Visit Block.
 */

Evaluator.prototype.visitBlock = function(block){
  this.stack.push(new Frame(block));
  for (block.index = 0; block.index < block.nodes.length; ++block.index) {
    try {
      block.nodes[block.index] = this.visit(block.nodes[block.index]);
    } catch (err) {
      if ('return' == err.nodeName) {
        if (this.ret) {
          this.stack.pop();
          throw err;
        } else {
          block.nodes[block.index] = err;
          break;
        }
      } else {
        throw err;
      }
    }
  }
  this.stack.pop();
  return block;
};

/**
 * Visit If.
 */

Evaluator.prototype.visitIf = function(node){
  var ret
    , _ = this.ret
    , block = this.currentBlock
    , negate = node.negate;

  this.ret = true;
  var ok = this.visit(node.cond).first.toBoolean();
  this.ret = _;

  // Evaluate body
  if (negate) {
    // unless
    if (ok.isFalse) {
      ret = this.visit(node.block);
    }
  } else {
    // if
    if (ok.isTrue) {
      ret = this.visit(node.block);
    // else
    } else if (node.elses.length) {
      var elses = node.elses
        , len = elses.length;
      for (var i = 0; i < len; ++i) {
        // else if
        if (elses[i].cond) {
          if (this.visit(elses[i].cond).first.toBoolean().isTrue) {
            ret = this.visit(elses[i].block);
            break;
          }
        // else 
        } else {
          ret = this.visit(elses[i]);
        }
      }
    }
  }

  // mixin conditional statements within a selector group
  if (ret && !node.postfix && block.node && 'group' == block.node.nodeName) {
    this.mixin(ret.nodes, block);
    return nodes.nil;
  }

  return ret || nodes.nil;
};

/**
 * Visit Import.
 */

Evaluator.prototype.visitImport = function(imported){
  var found
    , root = this.root
    , Parser = require('../parser')
    , path = this.visit(imported.path).first;

  // url() passed
  if ('url' == path.name) return imported;

  // Enusre string
  if (!path.string) throw new Error('@import string expected');
  var name = path = path.string;

  // Literal
  if (~path.indexOf('.css')) return imported;
  if (!~path.indexOf('.styl')) path += '.styl';

  // Lookup
  found = utils.lookup(path, this.paths, this.filename);
  found = found || utils.lookup(join(name, 'index.styl'), this.paths, this.filename);

  // Expose imports
  imported.path = found;
  imported.dirname = dirname(found);
  this.paths.push(imported.dirname);
  if (this.options._imports) this.options._imports.push(imported);

  // Throw if import failed
  if (!found) throw new Error('failed to locate @import file ' + path);

  // Parse the file
  this.importStack.push(found);
  nodes.filename = found;

  var str = fs.readFileSync(found, 'utf8')
    , block = new nodes.Block
    , parser = new Parser(str, utils.merge({ root: block }, this.options));

  try {
    block = parser.parse();
  } catch (err) {
    err.filename = found;
    err.lineno = parser.lexer.lineno;
    err.input = str;
    throw err;
  }

  // Store the modified time
  fs.stat(found, function(err, stat){
    if (err) return;
    imported.mtime = stat.mtime;
  });

  // Evaluate imported "root"
  block.parent = root;
  block.scope = false;
  var ret = this.visit(block);
  this.paths.pop();
  this.importStack.pop();

  return ret;
};

/**
 * Invoke `fn` with `args`.
 *
 * @param {Function} fn
 * @param {Array} args
 * @return {Node}
 * @api private
 */

Evaluator.prototype.invokeFunction = function(fn, args){
  var block = new nodes.Block(fn.block.parent);
  fn.block.parent = block;

  // Clone the function body
  // to prevent mutation of subsequent calls
  // inject argument scope
  var body = fn.block.clone();

  // mixin block
  var mixinBlock = this.stack.currentFrame.block;

  // new block scope
  this.stack.push(new Frame(block));
  var scope = this.currentScope;

  // arguments local
  scope.add(new nodes.Ident('arguments', args));

  // mixin scope introspection
  scope.add(new nodes.Ident('mixin', this.ret
    ? nodes.no
    : new nodes.String(mixinBlock.nodeName)));

  // current property
  if (this.property) {
    var prop = this.propertyExpression(this.property, fn.name);
    scope.add(new nodes.Ident('current-property', prop));
  } else {
    scope.add(new nodes.Ident('current-property', nodes.nil));
  }

  // inject arguments as locals
  var i = 0
    , len = args.nodes.length;
  fn.params.nodes.forEach(function(node){
    // rest param support
    if (node.rest) {
      node.val = new nodes.Expression;
      for (; i < len; ++i) node.val.push(args.nodes[i]);
      node.val.preserve = true;
    // argument default support
    } else {
      var arg = args.map[node.name] || args.nodes[i++];
      node = node.clone();
      if (arg) {
        if (!arg.isEmpty) node.val = arg;
      } else {
        args.push(node.val);
      }

      // required argument not satisfied
      if (node.val.isNull) {
        throw new Error('argument "' + node + '" required for ' + fn);
      }
    }

    scope.add(node);
  });

  // invoke
  return this.invoke(body, true);
};

/**
 * Invoke built-in `fn` with `args`.
 *
 * @param {Function} fn
 * @param {Array} args
 * @return {Node}
 * @api private
 */

Evaluator.prototype.invokeBuiltin = function(fn, args){
  // Map arguments to first node
  // providing a nicer js api for
  // BIFs. Functions may specify that
  // they wish to accept full expressions
  // via .raw
  if (fn.raw) {
    args = args.nodes;
  } else {
    args = utils.params(fn).reduce(function(ret, param){
      var arg = args.map[param] || args.nodes.shift();
      if (arg) ret.push(arg.first);
      return ret;
    }, []);
  }

  // Invoke the BIF
  var body = fn.apply(this, args);

  // Always wrapping allows js functions
  // to return several values with a single
  // Expression node
  var expr = new nodes.Expression;
  expr.push(body);
  body = expr;

  // Invoke
  return this.invoke(body);
};

/**
 * Invoke the given function `body`.
 *
 * @param {Block} body
 * @return {Node}
 * @api private
 */

Evaluator.prototype.invoke = function(body, stack){
  var self = this
    , ret;

  // Return
  if (this.ret) {
    ret = this.eval(body.nodes);
    if (stack) this.stack.pop();
  // Mixin
  } else {
    var targetFrame = this.stack[this.stack.length - 2];
    if (targetFrame) this.targetBlock = targetFrame.block;
    body = this.visit(body);
    if (stack) this.stack.pop();
    this.mixin(body.nodes, this.currentBlock);
    ret = nodes.nil;
  }

  return ret;
};

/**
 * Mixin the given `nodes` to the given `block`.
 *
 * @param {Array} nodes
 * @param {Block} block
 * @api private
 */

Evaluator.prototype.mixin = function(nodes, block){
  var len = block.nodes.length
    , head = block.nodes.slice(0, block.index)
    , tail = block.nodes.slice(block.index + 1, len);
  this._mixin(nodes, head);
  block.nodes = head.concat(tail);
};

/**
 * Mixin the given `nodes` to the `dest` array.
 *
 * @param {Array} nodes
 * @param {Array} dest
 * @api private
 */

Evaluator.prototype._mixin = function(nodes, dest){
  var node
    , len = nodes.length;
  for (var i = 0; i < len; ++i) {
    switch ((node = nodes[i]).nodeName) {
      case 'return':
        return;
      case 'block':
        this._mixin(node.nodes, dest);
        break;
      default:
        dest.push(node);
    }
  }
};

/**
 * Evaluate the given `vals`.
 *
 * @param {Array} vals
 * @return {Node}
 * @api private
 */

Evaluator.prototype.eval = function(vals){
  if (!vals) return nodes.nil;
  var len = vals.length
    , node = nodes.nil;

  try {
    for (var i = 0; i < len; ++i) {
      node = vals[i];
      switch (node.nodeName) {
        case 'if':
          if ('block' != node.block.nodeName) {
            node = this.visit(node);
            break;
          }
        case 'each':
        case 'block':
          node = this.visit(node);
          if (node.nodes) node = this.eval(node.nodes);
          break;
        default:
          node = this.visit(node);
      }
    }
  } catch (err) {
    if ('return' == err.nodeName) {
      return err.expr;
    } else {
      throw err;
    }
  }

  return node;
};

/**
 * Literal function `call`.
 *
 * @param {Call} call
 * @return {call}
 * @api private
 */

Evaluator.prototype.literalCall = function(call){
  call.args = this.visit(call.args);
  return call;
};

/**
 * Lookup property `name` in the in the current block.
 *
 * @param {String} name
 * @return {Property}
 * @api private
 */

Evaluator.prototype.lookupProperty = function(name){
  var nodes = this.closestBlock.nodes
    , target = (this.targetBlock && this.targetBlock.nodes) || []
    , nodes = target.concat(nodes);

  for (var i = 0, len = nodes.length; i < len; ++i) {
    if ('property' != nodes[i].nodeName) continue;
    if (name == this.interpolate(nodes[i])) {
      return nodes[i].clone();
    }
  }
};

/**
 * Lookup `name`, with support for JavaScript
 * functions, and BIFs.
 *
 * @param {String} name
 * @return {Node}
 * @api private
 */

Evaluator.prototype.lookup = function(name){
  var val;
  if (this.ignoreColors && name in colors) return;
  if (val = this.stack.lookup(name)) {
    return utils.unwrap(val);
  } else {
    return this.lookupFunction(name);
  }
};

/**
 * Map segments in `node` returning a string.
 *
 * @param {Node} node
 * @return {String}
 * @api private
 */

Evaluator.prototype.interpolate = function(node){
  var self = this;
  return node.segments.map(function(node){
    function toString(node) {
      switch (node.nodeName) {
        case 'function':
        case 'ident':
          return node.name;
        case 'literal':
        case 'string':
        case 'unit':
          return node.val;
        case 'expression':
          var _ = self.ret;
          self.ret = true;
          var ret = toString(self.visit(node).first); 
          self.ret = _;
          return ret;
      }
    }
    return toString(node);
  }).join('');
};

/**
 * Lookup JavaScript user-defined or built-in function.
 *
 * @param {String} name
 * @return {Function}
 * @api private
 */

Evaluator.prototype.lookupFunction = function(name){
  var fn = this.functions[name] || bifs[name];
  if (fn) return new nodes.Function(name, fn);
};

/**
 * Check if the given `node` is an ident, and if it is defined.
 *
 * @param {Node} node
 * @return {Boolean}
 * @api private
 */

Evaluator.prototype.isDefined = function(node){
  if ('ident' == node.nodeName) {
    return nodes.Boolean(this.lookup(node.name));
  } else {
    throw new Error('invalid "is defined" check on non-variable ' + node);
  }
};

/**
 * Return `Expression` based on the given `prop`,
 * replacing cyclic calls to the given function `name`
 * with "__CALL__".
 *
 * @param {Property} prop
 * @param {String} name
 * @return {Expression}
 * @api private
 */

Evaluator.prototype.propertyExpression = function(prop, name){
  var expr = new nodes.Expression
    , val = prop.expr.clone();

  // name
  expr.push(new nodes.String(prop.name));

  // replace cyclic call with __CALL__
  val.nodes = val.nodes.map(function(node){
    if ('call' == node.nodeName && name == node.name) {
      return new nodes.Literal('__CALL__');
    }
    return node;
  });

  expr.push(val);
  return expr;
};

/**
 * Warn with the given `msg`.
 *
 * @param {String} msg
 * @api private
 */

Evaluator.prototype.warn = function(msg){
  if (!this.warnings) return;
  console.warn('\033[33mWarning:\033[0m ' + msg);
};

/**
 * Return the current `Block`.
 *
 * @return {Block}
 * @api private
 */

Evaluator.prototype.__defineGetter__('currentBlock', function(){
  return this.stack.currentFrame.block;
});

/**
 * Return the closest mixin-able `Block`.
 *
 * @return {Block}
 * @api private
 */

Evaluator.prototype.__defineGetter__('closestBlock', function(){
  var i = this.stack.length
    , block;
  while (i--) {
    block = this.stack[i].block;
    if (block.node) {
      switch (block.node.nodeName) {
        case 'group':
        case 'function':
          return block;
      }
    }
  }
});

/**
 * Return an array of vendor names.
 *
 * @return {Array}
 * @api private
 */

Evaluator.prototype.__defineGetter__('vendors', function(){
  return []; // TOOD: fix
  return this.lookup('vendors').nodes.map(function(node){
    return node.string;
  });
});

/**
 * Return the current frame `Scope`.
 *
 * @return {Scope}
 * @api private
 */

Evaluator.prototype.__defineGetter__('currentScope', function(){
  return this.stack.currentFrame.scope;
});

/**
 * Return the current `Frame`.
 *
 * @return {Frame}
 * @api private
 */

Evaluator.prototype.__defineGetter__('currentFrame', function(){
  return this.stack.currentFrame;
});


});// module: visitor/evaluator.js

  return require('stylus');
})();