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#pragma once
// This file defines some functions to make it easy to parse simply formatted
// strings **correctly** without memory bugs.
//
// strparse(input_str, format...) - parse a string
//
// Examples:
//
// const char *filename; long line_num;
// const char *err = NULL;
// if ((err=strparse("foo.c:12", &filename, ":", &line_num)))
// errx(1, "Failed to parse file:line at: ", err);
//
// const char *item1, *item2;
// if ((err=strparse("one, two", &item1, ",", PARSE_WHITESPACE, &item2)))
// errx(1, "Failed to parse items at: ", err);
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "mapmacro.h"
typedef struct { char c; } some_char_t;
#define PARSE_SOME_OF(chars) ((some_char_t*)chars)
#define PARSE_WHITESPACE PARSE_SOME_OF(" \t\r\n\v")
typedef enum {PARSE_LITERAL, PARSE_LONG, PARSE_DOUBLE, PARSE_BOOL, PARSE_STRING, PARSE_SOME_OF} parse_type_e;
typedef struct { parse_type_e type; void *dest; } parse_element_t;
#define _parse_type(dest) _Generic((dest), \
some_char_t*: PARSE_SOME_OF, \
const char*: PARSE_LITERAL, \
const char**: PARSE_STRING, \
char**: PARSE_STRING, \
double*: PARSE_DOUBLE, \
long*: PARSE_LONG, \
bool*: PARSE_BOOL)
#define as_void_star(x) ((void*)x)
#define strparse(str, ...) simpleparse(str, sizeof((const void*[]){__VA_ARGS__})/sizeof(void*), (parse_type_e[]){MAP_LIST(_parse_type, __VA_ARGS__)}, (void*[]){MAP_LIST(as_void_star, __VA_ARGS__)})
#define fparse(file, ...) ({ char *_file_contents = NULL; size_t _file_len; \
(void)getdelim(&_file_contents, &_file_len, '\0', file); \
const char *_parse_err = strparse(_file_contents, __VA_ARGS__); \
free(_file_contents); \
_parse_err; })
const char *simpleparse(const char *str, int n, parse_type_e types[n], void *destinations[n]);
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
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