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template.py
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template.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
'''
@date: 2010-09-27
@author: shell.xu
@license: BSD-3-clause
'''
from __future__ import absolute_import, division,\
print_function, unicode_literals
import os
import sys
import codecs
import logging
import unittest
if sys.version_info.major == 3:
unicode = str
class TemplateCode(object):
TAB = u' '
def __init__(self):
self.deep, self.rslt, self.defs = 0, [], []
def str(self, s):
if not s:
return
self.rslt.append(
u'{}write(u\'\'\'{}\'\'\')'.format(self.TAB * self.deep, s))
def code(self, s):
r = self.map_code(s)
if not r:
return
self.rslt.append(r)
def map_code(self, s):
s, tab = s.strip(), self.deep
if s.startswith(u'='):
s = u'write(%s)' % s[1:]
elif s.startswith(u'end'):
self.deep -= 1
return
elif s.startswith(u'for') or s.startswith(u'if'):
self.deep += 1
elif s.startswith(u'el'):
tab -= 1
elif s.startswith(u'def'):
self.defs.append(s + u'\n')
return
elif s.startswith(u'include'):
self.include(s[8:])
return
elif s.startswith(u'import'):
self.defs.append(s + u'\n')
return
return self.TAB * tab + s
def include(self, filepath):
with open(filepath, 'r') as tfile:
self.process(tfile.read().decode('utf-8'))
def process(self, s):
while True:
i = s.partition(u'{%')
if not i[1]:
break
if i[0]:
self.str(i[0])
t = i[2].partition(u'%}')
if not t[1]:
raise Exception('not match')
self.code(t[0])
s = t[2]
self.str(s)
def get_code(self):
return u'\n'.join(self.rslt)
class Template(object):
'''
模板对象，用于生成模板
代码：
info = {'r': r, 'objs': [(1, 2), (3, 4)]}
response.append_body(tpl.render(info))
模板：
<html><head><title>{%=r.get('a', 'this is title')%}</title></head>
<body><table><tr><td>col1</td><td>col2</td></tr>
{%for i in objs:%}<tr><td>{%=i[0]%}</td><td>{%=i[1]%}</td></tr>{%end%}
</table></body></html>
'''
def __init__(self, filepath=None, template=None, env=None):
'''
@param filepath: 文件路径，直接从文件中load
@param template: 字符串，直接编译字符串
'''
if not env:
env = globals()
self.env = env
if filepath:
self.loadfile(filepath)
elif template:
self.loadstr(template)
def loadfile(self, filepath):
''' 从文件中读取字符串编译 '''
self.modify_time = os.stat(filepath).st_mtime
with codecs.open(filepath, 'r', 'utf-8') as tfile:
self.loadstr(tfile.read())
def loadstr(self, template):
''' 编译字符串成为可执行的内容 '''
tc = TemplateCode()
tc.process(template)
code = tc.get_code()
logging.debug(code)
self.htmlcode, self.defcodes = compile(code, '', 'exec'), {}
for i in tc.defs:
eval(compile(i, '', 'exec'), self.env, self.defcodes)
def reload(self, filepath):
''' 如果读取文件，测试文件是否更新。 '''
if not hasattr(self, 'modify_time') or \
os.stat(filepath).st_mtime > self.modify_time:
self.loadfile(filepath)
def render(self, kargs):
''' 根据参数渲染模板 '''
b = []
kargs['write'] = lambda x: b.append(unicode(x))
eval(self.htmlcode, self.defcodes, kargs)
return u''.join(b)
class TestTemplate(unittest.TestCase):
template = u'''<html><head><title>{%=r%}</title></head>
<body><table><tr><td>col1</td><td>col2</td></tr>
{%for i in objs:%}<tr><td>{%=i[0]%}</td><td>{%=i[1]%}</td></tr>
{%end%}</table></body></html>'''
result = u'''<html><head><title>test</title></head>
<body><table><tr><td>col1</td><td>col2</td></tr>
<tr><td>1</td><td>2</td></tr>
<tr><td>3</td><td>4</td></tr>
</table></body></html>'''
def test_render(self):
t = Template(template=self.template)
info = {u'r': u'test', u'objs': [(1, 2), (3, 4)]}
self.assertEqual(t.render(info), self.result)