SassVariableNode.php in Sassy 7

File

phamlp/sass/tree/SassVariableNode.php

<?php

/* SVN FILE: $Id$ */

/**
 * SassVariableNode 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
 */

/**
 * SassVariableNode class.
 * Represents a variable.
 * @package			PHamlP
 * @subpackage	Sass.tree
 */
class SassVariableNode extends SassNode {
  const MATCH = '/^([!$])([\\w-]+)\\s*:?\\s*((\\|\\|)?=)?\\s*(.+?)\\s*(!default)?;?$/i';
  const IDENTIFIER = 1;
  const NAME = 2;
  const SASS_ASSIGNMENT = 3;
  const SASS_DEFAULT = 4;
  const VALUE = 5;
  const SCSS_DEFAULT = 6;
  const SASS_IDENTIFIER = '!';
  const SCSS_IDENTIFIER = '$';

  /**
   * @var string name of the variable
   */
  private $name;

  /**
   * @var string value of the variable or expression to evaluate
   */
  private $value;

  /**
   * @var boolean whether the variable is optionally assigned
   */
  private $isDefault;

  /**
   * SassVariableNode constructor.
   * @param object source token
   * @return SassVariableNode
   */
  public function __construct($token) {
    parent::__construct($token);
    preg_match(self::MATCH, $token->source, $matches);
    if (empty($matches[self::NAME]) || $matches[self::VALUE] === '') {
      throw new SassVariableNodeException('Invalid variable definition; name and expression required', array(), $this);
    }
    $this->name = $matches[self::NAME];
    $this->value = $matches[self::VALUE];
    $this->isDefault = !empty($matches[self::SASS_DEFAULT]) || !empty($matches[self::SCSS_DEFAULT]);

    // Warn about deprecated features
    if ($matches[self::IDENTIFIER] === self::SASS_IDENTIFIER) {
      $this
        ->addWarning('Variables prefixed with "!" is deprecated; use "${name}"', array(
        '{name}' => $this->name,
      ));
    }
    if (!empty($matches[SassVariableNode::SASS_ASSIGNMENT])) {
      $this
        ->addWarning('Setting variables with "{sassDefault}=" is deprecated; use "${name}: {value}{scssDefault}"', array(
        '{sassDefault}' => !empty($matches[SassVariableNode::SASS_DEFAULT]) ? '||' : '',
        '{name}' => $this->name,
        '{value}' => $this->value,
        '{scssDefault}' => !empty($matches[SassVariableNode::SASS_DEFAULT]) ? ' !default' : '',
      ));
    }
  }

  /**
   * Parse this node.
   * Sets the variable in the current context.
   * @param SassContext the context in which this node is parsed
   * @return array the parsed node - an empty array
   */
  public function parse($context) {
    if (!$this->isDefault || !$context
      ->hasVariable($this->name)) {
      $context
        ->setVariable($this->name, $this
        ->evaluate($this->value, $context));
    }
    $this
      ->parseChildren($context);

    // Parse any warnings
    return array();
  }

  /**
   * Returns a value indicating if the token represents this type of node.
   * @param object token
   * @return boolean true if the token represents this type of node, false if not
   */
  public static function isa($token) {
    return $token->source[0] === self::SASS_IDENTIFIER || $token->source[0] === self::SCSS_IDENTIFIER;
  }

}

Classes

Name	Description
SassVariableNode	SassVariableNode class. Represents a variable. @package PHamlP @subpackage Sass.tree