/**
* Skips whitespace in the specified text by advancing an index to
* the next non-whitespace character.
*
* @param string $text Text to scan.
* @param int &$textIndex Index to begin scanning from.
*
* @return boolean true if the end of the string was reached, false otherwise.
*/
public static function skipWhiteSpace($text, &$textIndex)
{
$textLen = strlen($text);
while ($textIndex < $textLen && Char::isWhiteSpace($text[$textIndex])) {
$textIndex++;
}
return $textLen == $textIndex;
}
/**
* Validate current character is a digit.
*
* @return void
*/
private function _validateDigit()
{
if (!Char::isDigit($this->_ch)) {
throw $this->_parseError(Messages::expressionLexerDigitExpected($this->_textPos));
}
}