388 lines
10 KiB
C
388 lines
10 KiB
C
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/*
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* MIT License
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*
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* Copyright (c) 2010 Serge 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 THE
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* SOFTWARE.
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*/
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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, jsmntok_t *tokens,
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const size_t num_tokens) {
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jsmntok_t *tok;
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if (parser->toknext >= 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, const jsmntype_t type,
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const int start, const 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 int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
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const size_t len, jsmntok_t *tokens,
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const 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 (; parser->pos < len && 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':
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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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/* to quiet a warning from gcc*/
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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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/* 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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if (tokens == NULL) {
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parser->pos--;
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return 0;
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}
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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 0;
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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 int jsmn_parse_string(jsmn_parser *parser, const char *js,
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const size_t len, jsmntok_t *tokens,
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const size_t num_tokens) {
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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 && 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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if (tokens == NULL) {
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return 0;
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}
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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 0;
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}
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/* Backslash: Quoted symbol expected */
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if (c == '\\' && parser->pos + 1 < len) {
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int i;
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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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parser->pos++;
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for (i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0';
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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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int jsmn_parse(jsmn_parser *parser, const char *js, const size_t len,
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jsmntok_t *tokens, const unsigned int num_tokens) {
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int r;
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int i;
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jsmntok_t *token;
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int count = parser->toknext;
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for (; parser->pos < len && 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 '{':
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case '[':
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count++;
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if (tokens == NULL) {
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break;
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}
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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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}
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if (parser->toksuper != -1) {
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jsmntok_t *t = &tokens[parser->toksuper];
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#ifdef JSMN_STRICT
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/* In strict mode an object or array can't become a key */
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if (t->type == JSMN_OBJECT) {
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return JSMN_ERROR_INVAL;
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}
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#endif
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t->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 '}':
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case ']':
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if (tokens == NULL) {
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break;
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}
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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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if (token->type != type || parser->toksuper == -1) {
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return JSMN_ERROR_INVAL;
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}
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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) {
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return JSMN_ERROR_INVAL;
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}
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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, len, tokens, num_tokens);
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if (r < 0) {
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return r;
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}
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count++;
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if (parser->toksuper != -1 && tokens != NULL) {
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tokens[parser->toksuper].size++;
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}
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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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break;
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case ':':
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parser->toksuper = parser->toknext - 1;
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break;
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case ',':
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if (tokens != NULL && parser->toksuper != -1 &&
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tokens[parser->toksuper].type != JSMN_ARRAY &&
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tokens[parser->toksuper].type != JSMN_OBJECT) {
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#ifdef JSMN_PARENT_LINKS
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parser->toksuper = tokens[parser->toksuper].parent;
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#else
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for (i = parser->toknext - 1; i >= 0; i--) {
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if (tokens[i].type == JSMN_ARRAY || tokens[i].type == JSMN_OBJECT) {
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if (tokens[i].start != -1 && tokens[i].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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}
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#endif
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}
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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 '-':
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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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/* And they must not be keys of the object */
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if (tokens != NULL && parser->toksuper != -1) {
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const jsmntok_t *t = &tokens[parser->toksuper];
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if (t->type == JSMN_OBJECT ||
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(t->type == JSMN_STRING && t->size != 0)) {
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return JSMN_ERROR_INVAL;
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}
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}
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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, len, tokens, num_tokens);
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if (r < 0) {
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return r;
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}
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count++;
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if (parser->toksuper != -1 && tokens != NULL) {
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tokens[parser->toksuper].size++;
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}
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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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if (tokens != NULL) {
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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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}
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return count;
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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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