/**
* Handles a repetition token
*
* @param Token $token Token
*
* @return void
*/
protected function _handleRepetition(Token $token)
{
//If there is no current item, throw exception
if ($this->_currentItem === null) {
throw new Exception\InvalidRepetition("Nothing to repeat");
}
//Repetitions are allowed only after certain tokens, so check the last
//emitted token
$lastToken = $this->_tokensStack->top();
switch ($lastToken->getType()) {
//Handle lazy repetition
case Token::TYPE_REPETITION:
$prevLastToken = $this->_tokensStack->offsetGet(1);
//if this token is "?" and follows a repetition token that
//does not come after another repetition token set the lazy flag
if ($token->getIdentifier() === "?" && $prevLastToken->getType() !== Token::TYPE_REPETITION) {
//Check if last repetition supports the lazy flag
$lastRepetition = $this->_currentItem->getRepetition();
if ($lastRepetition->supportsLazy()) {
$lastRepetition->setLazy(true);
}
return;
} else {
throw new Exception\InvalidRepetition("Nothing to repeat");
}
break;
//Tokens that can handle the repetition
//Tokens that can handle the repetition
case Token::TYPE_NON_PRINTING_CHAR:
case Token::TYPE_GENERIC_CHAR_TYPE:
case Token::TYPE_CONTROL_CHAR:
case Token::TYPE_EXT_UNICODE_SEQUENCE:
case Token::TYPE_UNICODE_CHAR_CLASS:
case Token::TYPE_HEX_CHAR:
case Token::TYPE_DOT:
case Token::TYPE_BYTE:
case Token::TYPE_SUBPATTERN_END:
case Token::TYPE_COMMENT:
case Token::TYPE_OCTAL_CHAR:
case Token::TYPE_BACK_REFERENCE:
case Token::TYPE_CHAR_CLASS_END:
case Token::TYPE_RECURSIVE_PATTERN:
break;
//When simple characters are grouped, repetition is valid only
//for the last one, so it needs to be splitted so that the last
//character belongs to a different object
//When simple characters are grouped, repetition is valid only
//for the last one, so it needs to be splitted so that the last
//character belongs to a different object
case Token::TYPE_CHAR:
$chars = $this->_currentItem->getChar();
if (strlen($chars) > 1) {
$this->_currentItem->setChar(substr($chars, 0, -1));
$this->_currentItem = new Pattern\Char($chars[strlen($chars) - 1]);
$this->_containersStack->top()->addChild($this->_currentItem);
}
break;
default:
throw new Exception\InvalidRepetition("Repetition cannot be inserted at this point");
break;
}
//Get the right repetition class
switch ($token->getIdentifier()) {
case "*":
$repetition = new Pattern\Repetition\ZeroOrMore();
break;
case "+":
$repetition = new Pattern\Repetition\OneOrMore();
break;
case "?":
$repetition = new Pattern\Repetition\Optional();
break;
case "{":
//Check if {}
if (strpos($token->getSubject(), ",") === false) {
$repetition = new Pattern\Repetition\Number($token->getSubject());
} else {
$limits = explode(",", $token->getSubject());
$repetition = new Pattern\Repetition\Range($limits[0], $limits[1] === "" ? null : $limits[1]);
}
break;
}
//Set the repetition on the current item
$this->_currentItem->setRepetition($repetition);
}
