314 lines
6.8 KiB
C
314 lines
6.8 KiB
C
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/*
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* Copyright (c) 2010 Serge A. Zaitsev
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* Slightly modified by AK to not assume 0 terminated input.
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*/
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#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 pool.
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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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{
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jsmntok_t *tok;
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if ((unsigned)parser->toknext >= num_tokens)
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return NULL;
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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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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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{
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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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size_t len,
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jsmntok_t *tokens, size_t num_tokens)
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{
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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 (; parser->pos < len; parser->pos++) {
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switch (js[parser->pos]) {
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#ifndef JSMN_STRICT
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/*
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* In strict mode primitive must be followed by ","
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* or "}" or "]"
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*/
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case ':':
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#endif
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case '\t':
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case '\r':
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case '\n':
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case ' ':
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case ',':
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case ']':
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case '}':
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goto found;
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default:
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break;
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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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/*
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* In strict mode primitive must be followed by a
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* comma/object/array.
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*/
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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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parser->pos--; /* parent sees closing brackets */
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return JSMN_SUCCESS;
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}
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/*
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* Fills 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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size_t len,
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jsmntok_t *tokens, size_t num_tokens)
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{
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jsmntok_t *token;
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int start = parser->pos;
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/* Skip starting quote */
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parser->pos++;
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for (; parser->pos < len; 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,
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parser->pos);
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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 '\"':
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case '/':
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case '\\':
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case 'b':
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case 'f':
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case 'r':
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case 'n':
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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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/* TODO */
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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, size_t len,
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jsmntok_t *tokens, unsigned int num_tokens)
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{
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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 (; parser->pos < len; 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 '{':
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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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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 '}':
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case ']':
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type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
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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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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)
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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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break;
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case '\"':
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r = jsmn_parse_string(parser, js, len, tokens,
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num_tokens);
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if (r < 0)
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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':
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case '\r':
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case '\n':
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case ':':
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case ',':
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case ' ':
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break;
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#ifdef JSMN_STRICT
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/*
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* In strict mode primitives are:
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* numbers and booleans.
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*/
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case '-':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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case 't':
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case 'f':
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case 'n':
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#else
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/*
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* In non-strict mode every unquoted value
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* is a primitive.
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*/
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/*FALL THROUGH */
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default:
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#endif
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r = jsmn_parse_primitive(parser, js, len, tokens,
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num_tokens);
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if (r < 0)
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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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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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{
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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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const char *jsmn_strerror(jsmnerr_t err)
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{
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switch (err) {
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case JSMN_ERROR_NOMEM:
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return "No enough tokens";
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case JSMN_ERROR_INVAL:
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return "Invalid character inside JSON string";
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case JSMN_ERROR_PART:
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return "The string is not a full JSON packet, more bytes expected";
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case JSMN_SUCCESS:
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return "Success";
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default:
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return "Unknown json error";
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}
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}
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