vendor/leafo/scssphp/scss.inc.php

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<?php
/**
 * SCSS compiler written in PHP
 *
 * @copyright 2012-2013 Leaf Corcoran
 *
 * @license http://opensource.org/licenses/gpl-license GPL-3.0
 * @license http://opensource.org/licenses/MIT MIT
 *
 * @link http://leafo.net/scssphp
 */

/**
 * The scss compiler and parser.
 *
 * Converting SCSS to CSS is a three stage process. The incoming file is parsed
 * by `scss_parser` into a syntax tree, then it is compiled into another tree
 * representing the CSS structure by `scssc`. The CSS tree is fed into a
 * formatter, like `scss_formatter` which then outputs CSS as a string.
 *
 * During the first compile, all values are *reduced*, which means that their
 * types are brought to the lowest form before being dump as strings. This
 * handles math equations, variable dereferences, and the like.
 *
 * The `parse` function of `scssc` is the entry point.
 *
 * In summary:
 *
 * The `scssc` class creates an instance of the parser, feeds it SCSS code,
 * then transforms the resulting tree to a CSS tree. This class also holds the
 * evaluation context, such as all available mixins and variables at any given
 * time.
 *
 * The `scss_parser` class is only concerned with parsing its input.
 *
 * The `scss_formatter` takes a CSS tree, and dumps it to a formatted string,
 * handling things like indentation.
 */

/**
 * SCSS compiler
 *
 * @author Leaf Corcoran <leafot@gmail.com>
 */
class scssc {
	static public $VERSION = 'v0.0.11';

	static protected $operatorNames = array(
		'+' => "add",
		'-' => "sub",
		'*' => "mul",
		'/' => "div",
		'%' => "mod",

		'==' => "eq",
		'!=' => "neq",
		'<' => "lt",
		'>' => "gt",

		'<=' => "lte",