SassIfNode.php in Sassy 7

File

phamlp/sass/tree/SassIfNode.php

<?php

/* SVN FILE: $Id$ */

/**
 * SassIfNode class file.
 * @author			Chris Yates <[e-mail]>
 * @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 == '';
  }

}

Classes

Name	Description
SassIfNode	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