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268 lines
6.4 KiB
268 lines
6.4 KiB
#include <stdlib.h>
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#include "jsmn.h"
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/**
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* Allocates a fresh unused token from the token pull.
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*/
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static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
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jsmntok_t *tokens, size_t num_tokens) {
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jsmntok_t *tok;
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if (parser->toknext >= (int) num_tokens) {
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return NULL;
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}
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tok = &tokens[parser->toknext++];
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tok->start = tok->end = -1;
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tok->size = 0;
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#ifdef JSMN_PARENT_LINKS
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tok->parent = -1;
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#endif
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return tok;
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}
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/**
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* Fills token type and boundaries.
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*/
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static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
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int start, int end) {
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token->type = type;
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token->start = start;
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token->end = end;
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token->size = 0;
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}
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/**
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* Fills next available token with JSON primitive.
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*/
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static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
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jsmntok_t *tokens, size_t num_tokens) {
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jsmntok_t *token;
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int start;
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start = parser->pos;
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for (; js[parser->pos] != '\0'; parser->pos++) {
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switch (js[parser->pos]) {
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#ifndef JSMN_STRICT
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/* In strict mode primitive must be followed by "," or "}" or "]" */
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case ':':
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#endif
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case '\t' : case '\r' : case '\n' : case ' ' :
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case ',' : case ']' : case '}' :
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goto found;
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}
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if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
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parser->pos = start;
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return JSMN_ERROR_INVAL;
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}
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}
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#ifdef JSMN_STRICT
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/* In strict mode primitive must be followed by a comma/object/array */
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parser->pos = start;
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return JSMN_ERROR_PART;
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#endif
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found:
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token = jsmn_alloc_token(parser, tokens, num_tokens);
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if (token == NULL) {
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parser->pos = start;
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return JSMN_ERROR_NOMEM;
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}
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jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
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#ifdef JSMN_PARENT_LINKS
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token->parent = parser->toksuper;
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#endif
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parser->pos--;
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return JSMN_SUCCESS;
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}
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/**
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* Filsl next token with JSON string.
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*/
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static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
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jsmntok_t *tokens, size_t num_tokens) {
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jsmntok_t *token;
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int start = parser->pos;
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parser->pos++;
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/* Skip starting quote */
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for (; js[parser->pos] != '\0'; parser->pos++) {
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char c = js[parser->pos];
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/* Quote: end of string */
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if (c == '\"') {
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token = jsmn_alloc_token(parser, tokens, num_tokens);
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if (token == NULL) {
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parser->pos = start;
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return JSMN_ERROR_NOMEM;
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}
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jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
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#ifdef JSMN_PARENT_LINKS
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token->parent = parser->toksuper;
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#endif
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return JSMN_SUCCESS;
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}
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/* Backslash: Quoted symbol expected */
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if (c == '\\') {
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parser->pos++;
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switch (js[parser->pos]) {
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/* Allowed escaped symbols */
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case '\"': case '/' : case '\\' : case 'b' :
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case 'f' : case 'r' : case 'n' : case 't' :
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break;
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/* Allows escaped symbol \uXXXX */
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case 'u':
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parser->pos++;
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int i = 0;
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for(; i < 4 && js[parser->pos] != '\0'; i++) {
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/* If it isn't a hex character we have an error */
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if(!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
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(js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
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(js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
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parser->pos = start;
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return JSMN_ERROR_INVAL;
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}
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parser->pos++;
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}
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parser->pos--;
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break;
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/* Unexpected symbol */
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default:
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parser->pos = start;
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return JSMN_ERROR_INVAL;
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}
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}
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}
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parser->pos = start;
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return JSMN_ERROR_PART;
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}
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/**
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* Parse JSON string and fill tokens.
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*/
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jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, jsmntok_t *tokens,
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unsigned int num_tokens) {
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jsmnerr_t r;
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int i;
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jsmntok_t *token;
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for (; js[parser->pos] != '\0'; parser->pos++) {
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char c;
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jsmntype_t type;
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c = js[parser->pos];
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switch (c) {
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case '{': case '[':
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token = jsmn_alloc_token(parser, tokens, num_tokens);
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if (token == NULL)
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return JSMN_ERROR_NOMEM;
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if (parser->toksuper != -1) {
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tokens[parser->toksuper].size++;
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#ifdef JSMN_PARENT_LINKS
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token->parent = parser->toksuper;
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#endif
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}
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token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
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token->start = parser->pos;
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parser->toksuper = parser->toknext - 1;
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break;
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case '}': case ']':
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type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
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#ifdef JSMN_PARENT_LINKS
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if (parser->toknext < 1) {
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return JSMN_ERROR_INVAL;
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}
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token = &tokens[parser->toknext - 1];
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for (;;) {
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if (token->start != -1 && token->end == -1) {
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if (token->type != type) {
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return JSMN_ERROR_INVAL;
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}
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token->end = parser->pos + 1;
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parser->toksuper = token->parent;
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break;
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}
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if (token->parent == -1) {
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break;
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}
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token = &tokens[token->parent];
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}
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#else
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for (i = parser->toknext - 1; i >= 0; i--) {
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token = &tokens[i];
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if (token->start != -1 && token->end == -1) {
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if (token->type != type) {
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return JSMN_ERROR_INVAL;
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}
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parser->toksuper = -1;
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token->end = parser->pos + 1;
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break;
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}
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}
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/* Error if unmatched closing bracket */
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if (i == -1) return JSMN_ERROR_INVAL;
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for (; i >= 0; i--) {
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token = &tokens[i];
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if (token->start != -1 && token->end == -1) {
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parser->toksuper = i;
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break;
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}
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}
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#endif
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break;
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case '\"':
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r = jsmn_parse_string(parser, js, tokens, num_tokens);
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if (r < 0) return r;
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if (parser->toksuper != -1)
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tokens[parser->toksuper].size++;
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break;
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case '\t' : case '\r' : case '\n' : case ':' : case ',': case ' ':
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break;
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#ifdef JSMN_STRICT
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/* In strict mode primitives are: numbers and booleans */
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case '-': case '0': case '1' : case '2': case '3' : case '4':
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case '5': case '6': case '7' : case '8': case '9':
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case 't': case 'f': case 'n' :
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#else
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/* In non-strict mode every unquoted value is a primitive */
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default:
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#endif
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r = jsmn_parse_primitive(parser, js, tokens, num_tokens);
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if (r < 0) return r;
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if (parser->toksuper != -1)
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tokens[parser->toksuper].size++;
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break;
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#ifdef JSMN_STRICT
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/* Unexpected char in strict mode */
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default:
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return JSMN_ERROR_INVAL;
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#endif
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}
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}
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for (i = parser->toknext - 1; i >= 0; i--) {
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/* Unmatched opened object or array */
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if (tokens[i].start != -1 && tokens[i].end == -1) {
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return JSMN_ERROR_PART;
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}
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}
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return JSMN_SUCCESS;
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}
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/**
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* Creates a new parser based over a given buffer with an array of tokens
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* available.
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*/
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void jsmn_init(jsmn_parser *parser) {
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parser->pos = 0;
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parser->toknext = 0;
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parser->toksuper = -1;
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}
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