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#include <stdlib.h>
#include "jsmn.h"
void jsmn_init_parser(jsmn_parser *parser, const char *js,
jsontok_t *tokens, size_t num_tokens) {
unsigned int i;
parser->js = js;
parser->pos = 0;
parser->tokens = tokens;
parser->num_tokens = num_tokens;
for (i = 0; i < parser->num_tokens; i++) {
parser->tokens[i].start = -1;
parser->tokens[i].end = -1;
parser->tokens[i].type = JSON_OTHER;
}
}
jsontok_t *jsmn_start_token(jsmn_parser *parser, jsontype_t type) {
unsigned int i;
jsontok_t *tokens = parser->tokens;
for (i = 0; i<parser->num_tokens; i++) {
if (tokens[i].start == -1 && tokens[i].end == -1) {
tokens[i].start = parser->pos;
tokens[i].type = type;
return &tokens[i];
}
}
return NULL;
}
jsontok_t *jsmn_end_token(jsmn_parser *parser, jsontype_t type) {
int i;
jsontok_t *tokens = parser->tokens;
for (i = parser->num_tokens - 1; i>= 0; i--) {
if (tokens[i].type == type && tokens[i].start != -1 && tokens[i].end == -1) {
tokens[i].end = parser->pos;
return &tokens[i];
}
}
return NULL;
}
static int jsmn_parse_primitive(jsmn_parser *parser) {
const char *js;
jsontok_t *token;
js = parser->js;
token = jsmn_start_token(parser, JSON_NUMBER);
for (; js[parser->pos] != '\0'; parser->pos++) {
switch (js[parser->pos]) {
case '\t' : case '\r' : case '\n' : case ' ' :
case ',' : case ']' : case '}' :
token->end = parser->pos;
parser->pos--;
return JSMN_SUCCESS;
}
if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
return JSMN_ERROR_INVAL;
}
}
return JSMN_ERROR_PART;
}
static int jsmn_parse_string(jsmn_parser *parser) {
const char *js;
jsontok_t *token;
js = parser->js;
/* Check if string begins from a quote */
if (js[parser->pos] != '\"') {
return JSMN_ERROR_INVAL;
}
parser->pos++;
token = jsmn_start_token(parser, JSON_STRING);
/* Skip starting quote */
for (; js[parser->pos] != '\0'; parser->pos++) {
char c = js[parser->pos];
/* Quote: end of string */
if (c == '\"') {
token->end = 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:
return JSMN_ERROR_INVAL;
}
}
}
return JSMN_ERROR_PART;
}
jsmnerr_t jsmn_parse(jsmn_parser *parser) {
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 '[':
type = (c == '{' ? JSON_OBJECT : JSON_ARRAY);
token = jsmn_start_token(parser, type);
break;
case '}': case ']':
type = (c == '}' ? JSON_OBJECT : JSON_ARRAY);
token = jsmn_end_token(parser, type);
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' :
jsmn_parse_primitive(parser);
break;
case '\"':
jsmn_parse_string(parser);
break;
case '\t' : case '\r' : case '\n' : case ':' : case ',': case ' ':
break;
default:
return JSMN_ERROR_INVAL;
}
}
return JSMN_SUCCESS;
}
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