/**
* Parses the Token passed or creates a root Token based on the $stream of this Parser
* @param AbstractToken $token
* @param string $dataBefore
* @return Parser
* @throws \RuntimeException
*/
public function parse(AbstractToken $token = null, $dataBefore = null)
{
// If this is the root parser
if ($token === null) {
$tokeners = $this->lexer->getCreatedTokeners($this->stream);
$dataTker = $this->lexer->getCreatedDataTokener($this->stream);
$token = Lexer::tokenize($tokeners, $dataTker);
$this->token = $token;
} else {
if ($this->token === null) {
$this->token = $this->lexer->getCreatedDataTokener($dataBefore)->setParent($token->getParent())->autoClose();
$this->token = $this->composeToken($this->token->getStream(true));
}
}
// processing the Token
$token->process($this);
if ($this->token instanceof ComposedToken) {
$this->token->addToken($token);
}
// start parsing the identical level of remaining stream
$remaining = $token->getRemainingStream();
while ($remaining !== '') {
// create the appropiate Token by remaining stream
$tokeners = $this->lexer->getCreatedTokeners($remaining);
$dataTker = $this->lexer->getCreatedDataTokener($remaining);
$token = Lexer::tokenize($tokeners, $dataTker)->setParent($this->token->getParent())->process($this);
// switch to composed token first if more processable data found in stream
if (!$this->token instanceof ComposedToken) {
$this->token = $this->composeToken($this->token->getStream(true));
}
// add this new Token to the composition
$this->token->addToken($token);
// getting new state of remaining stream based on processed Token above
$remaining = $token->getRemainingStream();
}
return $this;
}
/**
* This is the core iteration of process() method
* @param Lexer $lexer
* @return int The returning position-offset for next iteration (will be incremented by 1)
*/
protected function iteration(Lexer $lexer)
{
$offset = 0;
// stop processing when simple closing sequence found
if ($this->identifyCloseTag()) {
$this->close();
return $offset;
}
// create a token on current position for checking if there's a sub-token
$substream = $this->getSubStream($this->getCursor());
$tokeners = $lexer->getCreatedTokeners($substream);
$dataTker = $lexer->getCreatedDataTokener($substream);
$token = Lexer::tokenize($tokeners, $dataTker);
// check if a sub-token found
if (!$token->isDataStream()) {
// getting a new instance of used Parser
$dataBefore = $this->getSubStream(0, $this->getCursor());
$this->subparser = $this->getParser()->getNewInstance($substream)->parse($token->setParent($this), $dataBefore);
// incrementing the position of processing to the end of the sub-token's closing tag
$offset = $this->subparser->getToken()->getLength();
$this->setCursor($offset);
$this->close(true);
// next iteration increments position to continue the processing
}
return $offset;
}
