JSMN_API int jsmn_parse()

in src/source/PeerConnection/jsmn.h [255:438]

• 172 lines of code
• 74 McCabe index (conditional complexity)

JSMN_API int jsmn_parse(jsmn_parser* parser, const char* js, const size_t len, jsmntok_t* tokens, const unsigned int num_tokens)
{
    int r;
    int i;
    jsmntok_t* token;
    int count = parser->toknext;

    for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
        char c;
        jsmntype_t type;

        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) {
                    jsmntok_t* t = &tokens[parser->toksuper];
#ifdef JSMN_STRICT
                    /* In strict mode an object or array can't become a key */
                    if (t->type == JSMN_OBJECT) {
                        return JSMN_ERROR_INVAL;
                    }
#endif
                    t->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) {
                            if (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) {
        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;
}