/**
* Retrieves the next token from the source stream.
*
* @return int or false
*/
function nextToken()
{
$src = ltrim($this->_source);
$this->_tokenValue = null;
$this->_token = JSPHON_TOKEN_EOF;
switch (true) {
case $src === '':
break;
case ($c = $src[0]) !== "" and isset($this->_tokenTable[$c]):
$this->_token = $this->_tokenTable[$c];
$src = substr($src, 1);
break;
case $c == '"' and preg_match('/^"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"/', $src, $m):
$this->_token = JSPHON_TOKEN_DATUM;
$this->_tokenValue = $m[1];
$src = substr($src, strlen($m[0]));
break;
case preg_match('/^(true|false|null)\\b/', $src, $m):
$this->_token = JSPHON_TOKEN_DATUM;
$this->_tokenValue = $this->_tokenValueTable[$m[1]];
$src = substr($src, $m[1][0] == 'f' ? 5 : 4);
break;
case preg_match('/^-?(?:[1-9]\\d+|\\d)(?:\\.\\d+)?(?:[eE][-+]?\\d+)?/', $src, $m):
$this->_token = JSPHON_TOKEN_DATUM;
$intV = (int) $m[0];
$floatV = (double) $m[0];
$this->_tokenValue = $intV == $floatV ? $intV : $floatV;
$src = substr($src, strlen($m[0]));
break;
default:
$err = Jsphon_Error::push(JSPHON_ERROR_DECODE_SYNTAX, 'error', array(), 'Illegal Token', false, debug_backtrace());
if (is_callable($this->_errorCallback)) {
call_user_func($this->_errorCallback, $err);
}
return false;
}
$this->_source = $src;
return $this->_token;
}
/**
* a simple wrapper for PEAR_ErrorStack::push.
*
* @param String $message
* @param array $param
* @param string $level
* @param int $code
* @return String
*/
function _error($message, $param = array(), $level = 'error', $code = JSPHON_ERROR_DECODE_SYNTAX)
{
$e = Jsphon_Error::push($code, $level, $param, $message, false, debug_backtrace());
$this->_internalError = true;
return $e;
}
