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/*
Simple text parsing library
Copyright (C) 2009-2014 Alexey Yakovenko
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include "parser.h"
// very basic parser, ripped from psynth, optimized, and extended to support
// quoted strings and extra special chars
int parser_line;
void
parser_init (void) {
parser_line = 1;
}
const char *
skipws (const char *p) {
while (*p <= ' ' && *p) {
if (*p == '\n') {
parser_line++;
}
p++;
}
if (!*p) {
return NULL;
}
return p;
}
const char *
gettoken_ext (const char *p, char *tok, const char *specialchars) {
const char *c;
assert (p);
assert (tok);
int n = MAX_TOKEN-1;
if (!(p = skipws (p))) {
return NULL;
}
if (*p == '"') {
p++;
c = p;
while (n > 0 && *c && *c != '"') {
if (*c == '\n') {
parser_line++;
}
*tok++ = *c++;
n--;
}
if (*c) {
c++;
}
*tok = 0;
return c;
}
if (strchr (specialchars, *p)) {
*tok = *p;
tok[1] = 0;
return p+1;
}
c = p;
while (n > 0 && *c > ' ' && !strchr (specialchars, *c)) {
*tok++ = *c++;
n--;
}
*tok = 0;
return c;
}
const char *
gettoken (const char *p, char *tok) {
char specialchars[] = "{}();";
return gettoken_ext (p, tok, specialchars);
}
const char *
gettoken_keyvalue (const char *p, char *key, char *val) {
char specialchars[] = "{}();=";
p = gettoken_ext (p, key, specialchars);
if (!p) {
return NULL;
}
p = gettoken_ext (p, val, specialchars);
if (!p || *val != '=') {
return NULL;
}
return gettoken_ext (p, val, specialchars);
}
const char *
gettoken_warn_eof (const char *p, char *tok) {
p = gettoken (p, tok);
if (!p) {
fprintf (stderr, "parser: unexpected eof at line %d", parser_line);
}
return p;
}
const char *
gettoken_err_eof (const char *p, char *tok) {
p = gettoken (p, tok);
if (!p) {
fprintf (stderr, "parser: unexpected eof at line %d", parser_line);
exit (-1);
}
return p;
}
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