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#include <stdlib.h>
#include "jsmn.h"
static jsontok_t *jsmn_get_token(jsmn_parser *parser) {
unsigned int i;
jsontok_t *tokens = parser->tokens;
for (i = parser->curtoken; i<parser->num_tokens; i++) {
if (tokens[i].start == -1 && tokens[i].end == -1) {
parser->curtoken = i;
return &tokens[i];
}
}
return NULL;
}
static void jsmn_fill_token(jsontok_t *token, jsontype_t type, int start, int end) {
token->type = type;
token->start = start;
token->end = end;
}
void jsmn_init_parser(jsmn_parser *parser, const char *js,
jsontok_t *tokens, unsigned int num_tokens) {
unsigned int i;
parser->js = js;
parser->pos = 0;
parser->tokens = tokens;
parser->num_tokens = num_tokens;
parser->curtoken = 0;
for (i = 0; i < parser->num_tokens; i++) {
jsmn_fill_token(&parser->tokens[i], JSON_PRIMITIVE, -1, -1);
}
}
static int jsmn_parse_primitive(jsmn_parser *parser) {
const char *js;
jsontok_t *token;
int start;
start = parser->pos;
js = parser->js;
for (; js[parser->pos] != '\0'; parser->pos++) {
switch (js[parser->pos]) {
case '\t' : case '\r' : case '\n' : case ' ' :
case ',' : case ']' : case '}' :
token = jsmn_get_token(parser);
jsmn_fill_token(token, JSON_PRIMITIVE, start, parser->pos);
parser->pos--;
return JSMN_SUCCESS;
}
if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
parser->pos = start;
return JSMN_ERROR_INVAL;
}
}
parser->pos = start;
return JSMN_ERROR_PART;
}
static int jsmn_parse_string(jsmn_parser *parser) {
const char *js;
jsontok_t *token;
int start = parser->pos;
js = parser->js;
parser->pos++;
/* Skip starting quote */
for (; js[parser->pos] != '\0'; parser->pos++) {
char c = js[parser->pos];
/* Quote: end of string */
if (c == '\"') {
token = jsmn_get_token(parser);
jsmn_fill_token(token, JSON_PRIMITIVE, start+1, parser->pos);
return JSMN_SUCCESS;
}
/* Backslash: Quoted symbol expected */
if (c == '\\') {
parser->pos++;
switch (js[parser->pos]) {
/* Allowed escaped symbols */
case '\"': case '/' : case '\\' : case 'b' :
case 'f' : case 'r' : case 'n' : case 't' :
break;
/* Allows escaped symbol \uXXXX */
case 'u':
/* TODO */
break;
/* Unexpected symbol */
default:
parser->pos = start;
return JSMN_ERROR_INVAL;
}
}
}
parser->pos = start;
return JSMN_ERROR_PART;
}
jsmnerr_t jsmn_parse(jsmn_parser *parser) {
int r;
unsigned int i;
const char *js;
jsontype_t type;
jsontok_t *token;
js = parser->js;
for (; js[parser->pos] != '\0'; parser->pos++) {
char c;
c = js[parser->pos];
switch (c) {
case '{': case '[':
token = jsmn_get_token(parser);
token->type = (c == '{' ? JSON_OBJECT : JSON_ARRAY);
token->start = parser->pos;
break;
case '}': case ']':
type = (c == '}' ? JSON_OBJECT : JSON_ARRAY);
for (i = parser->curtoken; i >= 0; i--) {
token = &parser->tokens[i];
if (token->start != -1 && token->end == -1) {
if (token->type != type) {
return JSMN_ERROR_INVAL;
}
token->end = parser->pos + 1;
break;
}
}
break;
case '-': case '0': case '1' : case '2': case '3' : case '4':
case '5': case '6': case '7' : case '8': case '9':
case 't': case 'f': case 'n' :
r = jsmn_parse_primitive(parser);
if (r < 0) return r;
break;
case '\"':
r = jsmn_parse_string(parser);
if (r < 0) return r;
break;
case '\t' : case '\r' : case '\n' : case ':' : case ',': case ' ':
break;
default:
return JSMN_ERROR_INVAL;
}
}
return JSMN_SUCCESS;
}
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