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executable file 95 lines (90 sloc) 2.533 kb
<?php
/* SVN FILE: $Id$ */
/**
* SassIfNode class file.
* @author Chris Yates <chris.l.yates@gmail.com>
* @copyright Copyright (c) 2010 PBM Web Development
* @license http://phamlp.googlecode.com/files/license.txt
* @package PHamlP
* @subpackage Sass.tree
*/
/**
* SassIfNode class.
* Represents Sass If, Else If and Else statements.
* Else If and Else statement nodes are chained below the If statement node.
* @package PHamlP
* @subpackage Sass.tree
*/
class SassIfNode extends SassNode {
const MATCH_IF = '/^@if\s+(.+)$/i';
const MATCH_ELSE = '/@else(\s+if\s+(.+))?/i';
const IF_EXPRESSION = 1;
const ELSE_IF = 1;
const ELSE_EXPRESSION = 2;
/**
* @var SassIfNode the next else node.
*/
private $else;
/**
* @var string expression to evaluate
*/
private $expression;
/**
* SassIfNode constructor.
* @param object source token
* @param boolean true for an "if" node, false for an "else if | else" node
* @return SassIfNode
*/
public function __construct($token, $if=true) {
parent::__construct($token);
if ($if) {
preg_match(self::MATCH_IF, $token->source, $matches);
$this->expression = $matches[SassIfNode::IF_EXPRESSION];
}
else {
preg_match(self::MATCH_ELSE, $token->source, $matches);
$this->expression = (sizeof($matches)==1 ? null : $matches[SassIfNode::ELSE_EXPRESSION]);
}
}
/**
* Adds an "else" statement to this node.
* @param SassIfNode "else" statement node to add
* @return SassIfNode this node
*/
public function addElse($node) {
if (is_null($this->else)) {
$node->parent = $this;
$node->root = $this->root;
$this->else = $node;
}
else {
$this->else->addElse($node);
}
return $this;
}
/**
* Parse this node.
* @param SassContext the context in which this node is parsed
* @return array parsed child nodes
*/
public function parse($context) {
if ($this->isElse() || $this->evaluate($this->expression, $context)->toBoolean()) {
$children = $this->parseChildren($context);
}
elseif (!empty($this->else)) {
$children = $this->else->parse($context);
}
else {
$children = array();
}
return $children;
}
/**
* Returns a value indicating if this node is an "else" node.
* @return true if this node is an "else" node, false if this node is an "if"
* or "else if" node
*/
private function isElse() {
return ($this->expression=='');
}
}
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