jsmn.c

#include "jsmn.h"

/**
 * Allocates a fresh unused token from the token pool.
 */
static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
                                   jsmntok_t *tokens, const size_t num_tokens) {
	jsmntok_t *tok;
	if (parser->toknext >= num_tokens) {
		return NULL;
	}
	tok = &tokens[parser->toknext++];
	tok->start = tok->end = -1;
	tok->size = 0;
#ifdef JSMN_PARENT_LINKS
	tok->parent = -1;
#endif
	return tok;
}

/**
 * Fills token type and boundaries.
 */
static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
                            const int start, const int end) {
	token->type = type;
	token->start = start;
	token->end = end;
	token->size = 0;
}

/**
 * Fills next available token with JSON primitive.
 */
static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
                                const size_t len, jsmntok_t *tokens, const size_t num_tokens) {
	jsmntok_t *token;
	int found = 0;
	const int start = parser->pos;

	while (parser->pos < len && js[parser->pos] != '\0' && !found) {
		switch (js[parser->pos]) {
#ifndef JSMN_STRICT
			/* In strict mode primitive must be followed by "," or "}" or "]" */
			case ':':
#endif
			case '\t': case '\r': case '\n': case ' ':
			case ',': case ']': case '}':
				found = 1;
		}
		if (!found) {
			if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
				parser->pos = start;
				return JSMN_ERROR_INVAL;
			}
			parser->pos++;
		}
	}
#ifdef JSMN_STRICT
	/* In strict mode primitive must be followed by a comma/object/array */
	if (!found) {
		parser->pos = start;
		return JSMN_ERROR_PART;
	}
#endif
	if (tokens == NULL) {
		parser->pos--;
		return 0;
	}
	token = jsmn_alloc_token(parser, tokens, num_tokens);
	if (token == NULL) {
		parser->pos = start;
		return JSMN_ERROR_NOMEM;
	}
	jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
#ifdef JSMN_PARENT_LINKS
	token->parent = parser->toksuper;
#endif
	parser->pos--;
	return 0;
}

/**
 * Fills next token with JSON string.
 */
static int jsmn_parse_string(jsmn_parser *parser, const char *js,
                             const size_t len, jsmntok_t *tokens, const size_t num_tokens) {
	jsmntok_t *token;
	const int start = parser->pos;

	parser->pos++;

	/* Skip starting quote */
	for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
		char c = js[parser->pos];

		/* Quote: end of string */
		if (c == '\"') {
			if (tokens == NULL) {
				return 0;
			}
			token = jsmn_alloc_token(parser, tokens, num_tokens);
			if (token == NULL) {
				parser->pos = start;
				return JSMN_ERROR_NOMEM;
			}
			jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
#ifdef JSMN_PARENT_LINKS
			token->parent = parser->toksuper;
#endif
			return 0;
		}

		/* Backslash: Quoted symbol expected */
		if (c == '\\' && parser->pos + 1 < len) {
			int i;
			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':
					c = js[++parser->pos];
					for(i = 0; i < 4 && parser->pos < len && c != '\0'; i++) {
						/* If it isn't a hex character we have an error */
						if(!((c >= '0' && c <= '9') ||
						     (c >= 'A' && c <= 'F') ||
						     (c >= 'a' && c <= 'f'))) {
							parser->pos = start;
							return JSMN_ERROR_INVAL;
						}
						c = js[++parser->pos];
					}
					parser->pos--;
					break;
				/* Unexpected symbol */
				default:
					parser->pos = start;
					return JSMN_ERROR_INVAL;
			}
		}
	}
	parser->pos = start;
	return JSMN_ERROR_PART;
}

/**
 * Parse JSON string and fill tokens.
 */
int jsmn_parse(jsmn_parser *parser, const char *js, const size_t len,
               jsmntok_t *tokens, const size_t num_tokens) {
	int count = parser->toknext;

	for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
		int r;
		char c;
		jsmntype_t type;
		jsmntok_t *token;
#ifndef JSMN_PARENT_LINKS
		int i;
#endif
		c = js[parser->pos];
		switch (c) {
			case '{': case '[':
				count++;
				if (tokens == NULL) {
					break;
				}
				token = jsmn_alloc_token(parser, tokens, num_tokens);
				if (token == NULL) {
					return JSMN_ERROR_NOMEM;
				}
				if (parser->toksuper != -1) {
					tokens[parser->toksuper].size++;
#ifdef JSMN_PARENT_LINKS
					token->parent = parser->toksuper;
#endif
				}
				token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
				token->start = parser->pos;
				parser->toksuper = parser->toknext - 1;
				break;
			case '}': case ']':
				if (tokens == NULL) {
					break;
				}
				type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
#ifdef JSMN_PARENT_LINKS
				if (parser->toknext < 1) {
					return JSMN_ERROR_INVAL;
				}
				token = &tokens[parser->toknext - 1];
				for (;;) {
					if (token->start != -1 && token->end == -1) {
						if (token->type != type) {
							return JSMN_ERROR_INVAL;
						}
						token->end = parser->pos + 1;
						parser->toksuper = token->parent;
						break;
					}
					if (token->parent == -1) {
						if(token->type != type || parser->toksuper == -1) {
							return JSMN_ERROR_INVAL;
						}
						break;
					}
					token = &tokens[token->parent];
				}
#else
				for (i = parser->toknext - 1; i >= 0; i--) {
					token = &tokens[i];
					if (token->start != -1 && token->end == -1) {
						if (token->type != type) {
							return JSMN_ERROR_INVAL;
						}
						parser->toksuper = -1;
						token->end = parser->pos + 1;
						break;
					}
				}
				/* Error if unmatched closing bracket */
				if (i == -1) {
					return JSMN_ERROR_INVAL;
				}
				for (; i >= 0; i--) {
					token = &tokens[i];
					if (token->start != -1 && token->end == -1) {
						parser->toksuper = i;
						break;
					}
				}
#endif
				break;
			case '\"':
				r = jsmn_parse_string(parser, js, len, tokens, num_tokens);
				if (r < 0) {
					return r;
				}
				count++;
				if (parser->toksuper != -1 && tokens != NULL)
					tokens[parser->toksuper].size++;
				break;
			case '\t': case '\r': case '\n': case ' ':
				break;
			case ':':
				parser->toksuper = parser->toknext - 1;
				break;
			case ',':
				if (tokens != NULL && parser->toksuper != -1 &&
				    tokens[parser->toksuper].type != JSMN_ARRAY &&
				    tokens[parser->toksuper].type != JSMN_OBJECT) {
#ifdef JSMN_PARENT_LINKS
					parser->toksuper = tokens[parser->toksuper].parent;
#else
					for (i = parser->toknext - 1; i >= 0; i--) {
						if ((tokens[i].type == JSMN_ARRAY ||
						     tokens[i].type == JSMN_OBJECT) &&
						    tokens[i].start != -1 &&
						    tokens[i].end == -1) {
							parser->toksuper = i;
							break;
						}
					}
#endif
				}
				break;
#ifdef JSMN_STRICT
			/* In strict mode primitives are: numbers and booleans */
			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':
				/* And they must not be keys of the object */
				if (tokens != NULL && parser->toksuper != -1) {
					const jsmntok_t *t = &tokens[parser->toksuper];
					if (t->type == JSMN_OBJECT ||
					    (t->type == JSMN_STRING && t->size != 0)) {
						return JSMN_ERROR_INVAL;
					}
				}
#else
			/* In non-strict mode every unquoted value is a primitive */
			default:
#endif
				r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens);
				if (r < 0) {
					return r;
				}
				count++;
				if (parser->toksuper != -1 && tokens != NULL) {
					tokens[parser->toksuper].size++;
				}
				break;

#ifdef JSMN_STRICT
			/* Unexpected char in strict mode */
			default:
				return JSMN_ERROR_INVAL;
#endif
		}
	}

	if (tokens != NULL) {
		int i;
		for (i = parser->toknext - 1; i >= 0; i--) {
			/* Unmatched opened object or array */
			if (tokens[i].start != -1 && tokens[i].end == -1) {
				return JSMN_ERROR_PART;
			}
		}
	}

	return count;
}

/**
 * Creates a new parser based over a given buffer with an array of tokens
 * available.
 */
void jsmn_init(jsmn_parser *parser) {
	parser->pos = 0;
	parser->toknext = 0;
	parser->toksuper = -1;
}