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<?php
/*
* This file is part of Mustache.php.
*
* (c) 2012 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Mustache Parser class.
*
* This class is responsible for turning a set of Mustache tokens into a parse tree.
*/
class Mustache_Parser
{
/**
* Process an array of Mustache tokens and convert them into a parse tree.
*
* @param array $tokens Set of Mustache tokens
*
* @return array Mustache token parse tree
*/
public function parse(array $tokens = array())
{
return $this->buildTree(new ArrayIterator($tokens));
}
/**
* Helper method for recursively building a parse tree.
*
* @param ArrayIterator $tokens Stream of Mustache tokens
* @param array $parent Parent token (default: null)
*
* @return array Mustache Token parse tree
*
* @throws LogicException when nesting errors or mismatched section tags are encountered.
*/
private function buildTree(ArrayIterator $tokens, array $parent = null)
{
$nodes = array();
do {
$token = $tokens->current();
$tokens->next();
if ($token === null) {
continue;
} else {
switch ($token[Mustache_Tokenizer::TYPE]) {
case Mustache_Tokenizer::T_SECTION:
case Mustache_Tokenizer::T_INVERTED:
$nodes[] = $this->buildTree($tokens, $token);
break;
case Mustache_Tokenizer::T_END_SECTION:
if (!isset($parent)) {
throw new LogicException('Unexpected closing tag: /'. $token[Mustache_Tokenizer::NAME]);
}
if ($token[Mustache_Tokenizer::NAME] !== $parent[Mustache_Tokenizer::NAME]) {
throw new LogicException('Nesting error: ' . $parent[Mustache_Tokenizer::NAME] . ' vs. ' . $token[Mustache_Tokenizer::NAME]);
}
$parent[Mustache_Tokenizer::END] = $token[Mustache_Tokenizer::INDEX];
$parent[Mustache_Tokenizer::NODES] = $nodes;
return $parent;
break;
default:
$nodes[] = $token;
break;
}
}
} while ($tokens->valid());
if (isset($parent)) {
throw new LogicException('Missing closing tag: ' . $parent[Mustache_Tokenizer::NAME]);
}
return $nodes;
}
}
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