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pretty.h
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pretty.h
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#ifndef PRETTY_H
#define PRETTY_H
// TODO: Add PRETTY_NO_SHORT_NAMES and prefix everything with pretty_
// by default.
#include <complex.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <float.h>
#include <math.h>
#if (__STDC_VERSION__ >= 199901L && __STDC_VERSION__ < 202000L)
#include <stdbool.h>
#elif __STDC_VERSION__ < 199901L
#define true ((unsigned int)1)
#define false ((unsigned int)0)
typedef unsigned int _Bool;
#define bool _Bool
#endif
#include <iso646.h>
// Missing yet useful.
#define eq ==
// SQL.
#define is ==
#define isnt !=
#define isnot !=
// Fixing inconsistent bit operation names.
#define bitnot ~
#define bitxor ^
// Frequently used types. Suckless and Go.
typedef char *string;
typedef char byte;
typedef char *bytes;
typedef void *any;
typedef unsigned char uchar;
typedef unsigned char ubyte;
typedef unsigned short ushort;
typedef unsigned int uint;
typedef unsigned long ulong;
// Small macros. Mostly from Suckless.
#define min(x, ...) ((x) < (__VA_ARGS__) ? (x) : (__VA_ARGS__))
#define max(x, ...) ((x) > (__VA_ARGS__) ? (x) : (__VA_ARGS__))
#define divisible(n, ...) ((__VA_ARGS__ == 0) ? 0 : ((n) % (__VA_ARGS__) == 0))
#define ensure(x, ...) ((x) ? (x) : (__VA_ARGS__))
#define limit(lo, n, hi) ((n) < (lo) ? (lo) : (n) > (hi) ? (hi) : (n))
#define clamp(lo, n, hi) limit(lo, n, hi)
#define between(lo, n, hi) ((n) <= (hi) && (n) => (lo))
// Predicates
#define success 0 ==
#define failure 0 !=
#define fail 0 !=
#define even 0 == 1 &
#define odd 1 == 1 &
#define positive 0 <
#define negative 0 >
#define zero 0 ==
#define empty NULL ==
#define null NULL ==
#if __STDC_VERSION__ >= 201112L
#define len(...) \
(__VA_ARGS__ == NULL) ? 0 \
: _Generic((__VA_ARGS__), \
char*: strlen((char*)(__VA_ARGS__)), \
default: (sizeof(__VA_ARGS__) / sizeof(__VA_ARGS__[0])))
#else
#define len(...) \
(__VA_ARGS__ == NULL) ? 0 \
: (sizeof(__VA_ARGS__) / sizeof(__VA_ARGS__[0]))
#endif
// Lua/Lisp nil.
#define nil NULL
// Comparion operators. Lisp loop macro and SQL keywords.
#define below <
#define above >
#define upto <=
#define downto >=
// Ternaries and conditionals.
#define ifnt(...) if(!(__VA_ARGS__))
#define ifnot(...) if(!(__VA_ARGS__))
#define elif else if
#define elifnt(...) else if(!(__VA_ARGS__))
#define elifnot(...) else if(!(__VA_ARGS__))
#define when
#define unless !
#define then ?
#define other :
#define otherwise :
#define otherwhen :
#define only : NULL
// Loops and blocks. Lisp, Lua, Ruby.
#define until(...) while(!(__VA_ARGS__))
#define always while(1)
#define forever while(1)
#define loop while(1)
#define indefinitely while(1)
#define never while(0)
#define comment while(0)
#define repeat do
#define done break
#define finish break
#define pass continue
// Dynamically-typed declarations
#if defined(__GNUC__) || defined(__GNUG__)
#define var __auto_type
#define let __auto_type
#define local __auto_type
#elif __STDC_VERSION__ > 201710L || defined(__cplusplus)
#define var auto
#define let auto
#define local auto
#endif
// Clearer name for const
#define readonly const
// Tracking and freeing resources. Lisp, Python.
#if (__STDC_VERSION__ > 201710L || defined(__GNUC__) || defined(__GNUG__))
#define with(var, close, ...) \
for (typeof((__VA_ARGS__)) var = (__VA_ARGS__), \
*pretty_with_flag = (void*) 1; \
pretty_with_flag; \
(close)(var), pretty_with_flag = (void*) 0)
#else
#define with(var, close, ...) \
for (void *var = (void*) (__VA_ARGS__), \
*pretty_with_flag = (void*) 1; \
pretty_with_flag; \
(close)(var), pretty_with_flag = (void*) 0)
#endif
// Ranges from INIT to TARGET. Python range() syntax.
#define forrangeby(var, type, init, target, by) \
for (type var = (type)(init); \
(((init) >= ((type) target)) \
? (var > ((type) target)) \
: (var < ((type) target))); \
(((init) >= ((type) target)) \
? (var -= (by)) \
: (var += (by))))
#if (__STDC_VERSION__ > 201710L || defined(__GNUC__) || defined(__GNUG__)) && !defined(__clang_major__)
#define forrange(var, init, ...) \
for (typeof((init)+(__VA_ARGS__)) pretty_init = (init), \
var = pretty_init, \
pretty_target = (__VA_ARGS__); \
((pretty_init >= pretty_target) \
? (var > pretty_target) \
: (var < pretty_target)); \
var += ((pretty_init >= pretty_target) ? -1 : +1))
#else
#define forrange(var, init, ...) \
for (int pretty_init = (init), \
var = pretty_init, \
pretty_target = (__VA_ARGS__); \
var != pretty_target; \
var += ((pretty_init >= pretty_target) ? -1 : +1))
#endif
// Repeat X times. Lisp, Lua
#if (__STDC_VERSION__ > 201710L || defined(__GNUC__) || defined(__GNUG__)) && !defined(__clang_major__)
#define fortimes(var, ...) \
for (typeof((__VA_ARGS__)) pretty_result = (__VA_ARGS__), \
var = (typeof((__VA_ARGS__))) 0; \
var < pretty_result; \
++var)
#else
#define fortimes(var, ...) \
for (size_t var = 0, pretty_result = (size_t)(__VA_ARGS__); \
var < pretty_result; \
++var)
#endif
// For each loop from basically every language.
#define foreach(var, type, length, ...) \
for (type *pretty_init = (__VA_ARGS__), \
*pretty_foreach_flag = (void*) 1; \
pretty_foreach_flag; \
pretty_foreach_flag = (void*) 0) \
for (size_t pretty_offset = 0; \
pretty_offset < length; \
pretty_offset += 1) \
for (type *var = (pretty_init + pretty_offset), \
*pretty_foreach_flag2 = (void*) 1; \
pretty_foreach_flag2; \
pretty_foreach_flag2 = (void*) 0)
// Loop over the provided arguments.
#define forthese(var, type, ...) \
for (type *pretty_init = (type[]){__VA_ARGS__}, \
*pretty_forthese_flag = (void*) 1; \
pretty_forthese_flag; \
pretty_forthese_flag = (void*) 0) \
for (size_t pretty_offset = 0; \
pretty_offset < (sizeof((type[]){__VA_ARGS__}) \
/ sizeof(type)); \
pretty_offset += 1) \
for (type var = pretty_init [pretty_offset], \
*pretty_forthese_flag2 = (void*) 1; \
pretty_forthese_flag2; \
pretty_forthese_flag2 = (void*) 0)
static void *
pretty_allocpy(size_t size, void *contents)
{
char *allocated = malloc(size);
memcpy(allocated, contents, size);
return allocated;
}
// Easy resource allocation akin to C++.
#define new(type, ...) \
(type *) pretty_allocpy(sizeof(type), &((type) {__VA_ARGS__}))
// Easy array allocation. C++ vector, but more primitive.
// FIXME: Enforce array type somehow?
// TODO: Infer the type from the __VA_ARGS__.
#define vector(length, type, ...) \
(type*) pretty_allocpy(sizeof(type) * length, \
(type[length]){__VA_ARGS__})
#define delete free
// TODO: A macro to allocate struct + flexible array member.
// Go defer, but rather block scoped and with arbitrary code in it.
#define defer(...) \
for (bool pretty_flag = 1; \
pretty_flag; \
pretty_flag = 0, (__VA_ARGS__))
#define try \
errno = 0; \
for (bool pretty_flag = 1; \
pretty_flag; \
pretty_flag = 0)
static int
pretty_err_part_of(int err, size_t length, int *errs)
{
for (size_t i = 0; i < length; ++i)
if (err == errs[i])
return 1;
return 0;
}
#define catch(...) \
if (pretty_err_part_of \
(errno, \
sizeof ((int[]){__VA_ARGS__}) / sizeof(int), \
(int[]){__VA_ARGS__}))
#define NOERROR 0
#define NOERR 0
#if defined(__clang_major__)
#define lambda(ret, name, ...) void * name = (void*) ^ ret (__VA_ARGS__)
#elif defined(__GNUC__) || defined(__GNUG__)
#define lambda(ret, name, ...) ret name (__VA_ARGS__)
#elif defined(__cplusplus)
#define lambda(ret, name, ...) auto name = [](__VA_ARGS__)
#endif
#if __STDC_VERSION__ >= 201112L
#define print(...) \
_Generic((__VA_ARGS__), \
_Bool: fputs((_Bool)(__VA_ARGS__) ? "true" : "false", stdout), \
default: printf( \
_Generic((__VA_ARGS__), \
char*: "%s", \
char: "%c", \
signed char: "%hhi", \
short: "%hi", \
int: "%i", \
long: "%li", \
long long: "%lli", \
unsigned char: "%hhu", \
unsigned short: "%hi", \
unsigned int: "%u", \
unsigned long: "%lu", \
unsigned long long: "%llu", \
float: "%g", \
double: "%g", \
long double: "%Lg", \
default: "%p"), \
(__VA_ARGS__)))
#define println(...) \
print(__VA_ARGS__), print("\n")
#endif
static int
pretty_anything_equal(unsigned long long a, unsigned long long b)
{
return a == b;
}
// TODO: scale it |x - y| <= ε * max(|x|, |y|)
// Thanks to the Hacker News commenter!
static int
pretty_float_equal(float a, float b)
{
return fabsf(a - b) < FLT_EPSILON;
}
static int
pretty_double_equal(double a, double b)
{
return fabs(a - b) < DBL_EPSILON;
}
static int
pretty_long_double_equal(long double a, long double b)
{
return fabsl(a - b) < LDBL_EPSILON;
}
static int
pretty_string_equal(char *a, char *b)
{
return !strcmp(a, b);
}
#if __STDC_VERSION__ >= 201112L
#define equal(a, ...) \
_Generic((__VA_ARGS__), \
float: pretty_float_equal, \
double: pretty_double_equal, \
long double: pretty_long_double_equal, \
char *: pretty_string_equal, \
default: pretty_anything_equal) \
(a, __VA_ARGS__)
#define like(a, ...) equal(a, __VA_ARGS__)
#endif
static int
pretty_in(void *thing, size_t thing_size, size_t total_size, void *things)
{
char *char_things = things;
for (size_t i = 0; i < total_size; i += thing_size)
if (!memcmp(thing, char_things + i, thing_size))
return 1;
return 0;
}
#define in(thing, type, ...) \
pretty_in((void*)(type[1]){thing}, \
sizeof(type), \
sizeof((type[]){__VA_ARGS__}), \
(void*)(type[]){__VA_ARGS__})
#endif /* PRETTY_H */