File content as of revision 0:7f4a18b3fd82:

#include "jsmn.h"

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

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

/**
 * Fills next available token with JSON primitive.
 */
static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
                                size_t len, jsmntok_t *tokens, size_t num_tokens)
{
    jsmntok_t *token;
    int start;
    
    start = parser->pos;
    
    for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
        switch (js[parser->pos]) {
            case '\t' :
            case '\r' :
            case '\n' :
            case ' ' :
            case ','  :
            case ']'  :
            case '}' :
                goto found;
        }
        if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
            parser->pos = start;
            return JSMN_ERROR_INVAL;
        }
    }
    /* primitive must be followed by a comma/object/array */
    parser->pos = start;
    return JSMN_ERROR_PART;
    
found:
    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);
    token->parent = parser->toksuper;
    parser->pos--;
    return 0;
}

/**
 * Fills next token with JSON string.
 */
static int jsmn_parse_string(jsmn_parser *parser, const char *js,
                             size_t len, jsmntok_t *tokens, size_t num_tokens, unsigned char isKey )
{
    jsmntok_t *token;
    
    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;
            }
            if ( isKey == 1 ) {
                jsmn_fill_token(token, JSMN_KEY, start+1, parser->pos);
            }
            else {
                jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
            }
            token->parent = parser->toksuper;
            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':
                    parser->pos++;
                    for(i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0'; i++) {
                        /* If it isn't a hex character we have an error */
                        if(!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
                             (js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
                             (js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
                            parser->pos = start;
                            return JSMN_ERROR_INVAL;
                        }
                        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, size_t len,
               jsmntok_t *tokens, unsigned int num_tokens)
{
    int r;
    int i;
    jsmntok_t *token;
    int count = parser->toknext;
    
    unsigned char isKey = 1;
    
    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) {
                    tokens[parser->toksuper].childCount++;
                    token->parent = parser->toksuper;
                }
                token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
                token->start = parser->pos;
                parser->toksuper = parser->toknext - 1;
                if ( token -> type == JSMN_OBJECT ) {
                    isKey = 1;
                }
                break;
            case '}':
            case ']':
                if (tokens == NULL)
                    break;
                type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
                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) {
                        break;
                    }
                    token = &tokens[token->parent];
                }
                break;
            case '\"':
                r = jsmn_parse_string(parser, js, len, tokens, num_tokens, isKey);
                if (r < 0) return r;
                count++;
                if (parser->toksuper != -1 && tokens != NULL)
                    tokens[parser->toksuper].childCount++;
                break;
            case '\t' :
            case '\r' :
            case '\n' :
            case ' ':
                break;
            case ':':
                isKey = 0;
                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) {
                    parser->toksuper = tokens[parser->toksuper].parent;
                }
                isKey = 1;
                break;
                /* 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) {
                    jsmntok_t *t = &tokens[parser->toksuper];
                    if (t->type == JSMN_OBJECT ||
                        (t->type == JSMN_STRING && t->childCount != 0)) {
                        return JSMN_ERROR_INVAL;
                    }
                }
                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].childCount++;
                break;
                
                /* Unexpected char in strict mode */
            default:
                return JSMN_ERROR_INVAL;
        }
    }
    
    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;
}

/**
 * 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;
}