/**
* This function handles parsing the beginnings of an open tag. When we see a [
* at an appropriate time, this function is entered.
*
* @param ElementNode $parent the current parent node
* @param Tokenizer $tokenizer the tokenizer we're using
*
* @return ElementNode the new parent node
*/
protected function parseTagOpen(ElementNode $parent, Tokenizer $tokenizer)
{
if (!$tokenizer->hasNext()) {
/* The [ that sent us to this state was just a trailing [, not the
* opening for a new tag. Treat it as such. */
$this->createTextNode($parent, '[');
return $parent;
}
$next = $tokenizer->next();
/* This while loop could be replaced by a recursive call to this same method,
* which would likely be a lot clearer but I decided to use a while loop to
* prevent stack overflow with a string like [[[[[[[[[...[[[.
*/
while ('[' == $next) {
/* The previous [ was just a random bracket that should be treated as text.
* Continue until we get a non open bracket. */
$this->createTextNode($parent, '[');
if (!$tokenizer->hasNext()) {
$this->createTextNode($parent, '[');
return $parent;
}
$next = $tokenizer->next();
}
if (!$tokenizer->hasNext()) {
$this->createTextNode($parent, '[' . $next);
return $parent;
}
$after_next = $tokenizer->next();
$tokenizer->stepBack();
if ($after_next != ']') {
$this->createTextNode($parent, '[' . $next);
return $parent;
}
/* At this point $next is either ']' or plain text. */
if (']' == $next) {
$this->createTextNode($parent, '[');
$this->createTextNode($parent, ']');
return $parent;
} else {
/* $next is plain text... likely a tag name. */
return $this->parseTag($parent, $tokenizer, $next);
}
}
