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LibYAML/scanner.c  view on Meta::CPAN

yaml_parser_stale_simple_keys(yaml_parser_t *parser)
{
    yaml_simple_key_t *simple_key;

    /* Check for a potential simple key for each flow level. */

    for (simple_key = parser->simple_keys.start;
            simple_key != parser->simple_keys.top; simple_key ++)
    {
        /*
         * The specification requires that a simple key
         *
         *  - is limited to a single line,
         *  - is shorter than 1024 characters.
         */

        if (simple_key->possible
                && (simple_key->mark.line < parser->mark.line
                    || simple_key->mark.index+1024 < parser->mark.index)) {

            /* Check if the potential simple key to be removed is required. */

            if (simple_key->required) {
                return yaml_parser_set_scanner_error(parser,
                        "while scanning a simple key", simple_key->mark,
                        "could not find expected ':'");
            }

            simple_key->possible = 0;
        }
    }

    return 1;
}

/*
 * Check if a simple key may start at the current position and add it if
 * needed.
 */

static int
yaml_parser_save_simple_key(yaml_parser_t *parser)
{
    /*
     * A simple key is required at the current position if the scanner is in
     * the block context and the current column coincides with the indentation
     * level.
     */

    int required = (!parser->flow_level
            && parser->indent == (ptrdiff_t)parser->mark.column);

    /*
     * If the current position may start a simple key, save it.
     */

    if (parser->simple_key_allowed)
    {
        yaml_simple_key_t simple_key;
        simple_key.possible = 1;
        simple_key.required = required;
        simple_key.token_number =
            parser->tokens_parsed + (parser->tokens.tail - parser->tokens.head);
        simple_key.mark = parser->mark;

        if (!yaml_parser_remove_simple_key(parser)) return 0;

        *(parser->simple_keys.top-1) = simple_key;
    }

    return 1;
}

/*
 * Remove a potential simple key at the current flow level.
 */

static int
yaml_parser_remove_simple_key(yaml_parser_t *parser)
{
    yaml_simple_key_t *simple_key = parser->simple_keys.top-1;

    if (simple_key->possible)
    {
        /* If the key is required, it is an error. */

        if (simple_key->required) {
            return yaml_parser_set_scanner_error(parser,
                    "while scanning a simple key", simple_key->mark,
                    "could not find expected ':'");
        }
    }

    /* Remove the key from the stack. */

    simple_key->possible = 0;

    return 1;
}

/*
 * Increase the flow level and resize the simple key list if needed.
 */

static int
yaml_parser_increase_flow_level(yaml_parser_t *parser)
{
    yaml_simple_key_t empty_simple_key = { 0, 0, 0, { 0, 0, 0 } };

    /* Reset the simple key on the next level. */

    if (!PUSH(parser, parser->simple_keys, empty_simple_key))
        return 0;

    /* Increase the flow level. */

    if (parser->flow_level == INT_MAX) {
        parser->error = YAML_MEMORY_ERROR;
        return 0;
    }