Revert "update less.php to PHP 7.x compatible fork"

This reverts commit 7ad9f272a482802da2d43fe83841adbe9bcd8cb4.

1 files changed, 0 insertions, 1188 deletions

diff --git a/lib/less.php/Functions.php b/lib/less.php/Functions.php
deleted file mode 100644
index a61e5ac..0000000
--- a/lib/less.php/Functions.php
+++ /dev/null
@@ -1,1188 +0,0 @@
-<?php
-
-/**
- * Builtin functions
- *
- * @package Less
- * @subpackage function
- * @see http://lesscss.org/functions/
- */
-class Less_Functions{
-
-	public $env;
-	public $currentFileInfo;
-
-	function __construct($env, $currentFileInfo = null ){
-		$this->env = $env;
-		$this->currentFileInfo = $currentFileInfo;
-	}
-
-	/**
-	 * @param string $op
-	 */
-	public static function operate( $op, $a, $b ){
-		switch ($op) {
-			case '+': return $a + $b;
-			case '-': return $a - $b;
-			case '*': return $a * $b;
-			case '/': return $a / $b;
-		}
-	}
-
-	public static function clamp($val, $max = 1){
-		return min( max($val, 0), $max);
-	}
-
-	public static function fround( $value ){
-
-		if( $value === 0 ){
-			return $value;
-		}
-
-		if( Less_Parser::$options['numPrecision'] ){
-			$p = pow(10, Less_Parser::$options['numPrecision']);
-			return round( $value * $p) / $p;
-		}
-		return $value;
-	}
-
-	public static function number($n){
-
-		if ($n instanceof Less_Tree_Dimension) {
-			return floatval( $n->unit->is('%') ? $n->value / 100 : $n->value);
-		} else if (is_numeric($n)) {
-			return $n;
-		} else {
-			throw new Less_Exception_Compiler("color functions take numbers as parameters");
-		}
-	}
-
-	public static function scaled($n, $size = 255 ){
-		if( $n instanceof Less_Tree_Dimension && $n->unit->is('%') ){
-			return (float)$n->value * $size / 100;
-		} else {
-			return Less_Functions::number($n);
-		}
-	}
-
-	public function rgb ($r = null, $g = null, $b = null){
-		if (is_null($r) || is_null($g) || is_null($b)) {
-			throw new Less_Exception_Compiler("rgb expects three parameters");
-		}
-		return $this->rgba($r, $g, $b, 1.0);
-	}
-
-	public function rgba($r = null, $g = null, $b = null, $a = null){
-		$rgb = array($r, $g, $b);
-		$rgb = array_map(array('Less_Functions','scaled'),$rgb);
-
-		$a = self::number($a);
-		return new Less_Tree_Color($rgb, $a);
-	}
-
-	public function hsl($h, $s, $l){
-		return $this->hsla($h, $s, $l, 1.0);
-	}
-
-	public function hsla($h, $s, $l, $a){
-
-		$h = fmod(self::number($h), 360) / 360; // Classic % operator will change float to int
-		$s = self::clamp(self::number($s));
-		$l = self::clamp(self::number($l));
-		$a = self::clamp(self::number($a));
-
-		$m2 = $l <= 0.5 ? $l * ($s + 1) : $l + $s - $l * $s;
-
-		$m1 = $l * 2 - $m2;
-
-		return $this->rgba( self::hsla_hue($h + 1/3, $m1, $m2) * 255,
-							self::hsla_hue($h, $m1, $m2) * 255,
-							self::hsla_hue($h - 1/3, $m1, $m2) * 255,
-							$a);
-	}
-
-	/**
-	 * @param double $h
-	 */
-	public function hsla_hue($h, $m1, $m2){
-		$h = $h < 0 ? $h + 1 : ($h > 1 ? $h - 1 : $h);
-		if	  ($h * 6 < 1) return $m1 + ($m2 - $m1) * $h * 6;
-		else if ($h * 2 < 1) return $m2;
-		else if ($h * 3 < 2) return $m1 + ($m2 - $m1) * (2/3 - $h) * 6;
-		else				 return $m1;
-	}
-
-	public function hsv($h, $s, $v) {
-		return $this->hsva($h, $s, $v, 1.0);
-	}
-
-	/**
-	 * @param double $a
-	 */
-	public function hsva($h, $s, $v, $a) {
-		$h = ((Less_Functions::number($h) % 360) / 360 ) * 360;
-		$s = Less_Functions::number($s);
-		$v = Less_Functions::number($v);
-		$a = Less_Functions::number($a);
-
-		$i = floor(($h / 60) % 6);
-		$f = ($h / 60) - $i;
-
-		$vs = array( $v,
-				  $v * (1 - $s),
-				  $v * (1 - $f * $s),
-				  $v * (1 - (1 - $f) * $s));
-
-		$perm = array(array(0, 3, 1),
-					array(2, 0, 1),
-					array(1, 0, 3),
-					array(1, 2, 0),
-					array(3, 1, 0),
-					array(0, 1, 2));
-
-		return $this->rgba($vs[$perm[$i][0]] * 255,
-						 $vs[$perm[$i][1]] * 255,
-						 $vs[$perm[$i][2]] * 255,
-						 $a);
-	}
-
-	public function hue($color = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to hue must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$c = $color->toHSL();
-		return new Less_Tree_Dimension(Less_Parser::round($c['h']));
-	}
-
-	public function saturation($color = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to saturation must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$c = $color->toHSL();
-		return new Less_Tree_Dimension(Less_Parser::round($c['s'] * 100), '%');
-	}
-
-	public function lightness($color = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to lightness must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$c = $color->toHSL();
-		return new Less_Tree_Dimension(Less_Parser::round($c['l'] * 100), '%');
-	}
-
-	public function hsvhue( $color = null ){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to hsvhue must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsv = $color->toHSV();
-		return new Less_Tree_Dimension( Less_Parser::round($hsv['h']) );
-	}
-
-
-	public function hsvsaturation( $color = null ){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to hsvsaturation must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsv = $color->toHSV();
-		return new Less_Tree_Dimension( Less_Parser::round($hsv['s'] * 100), '%' );
-	}
-
-	public function hsvvalue( $color = null ){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to hsvvalue must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsv = $color->toHSV();
-		return new Less_Tree_Dimension( Less_Parser::round($hsv['v'] * 100), '%' );
-	}
-
-	public function red($color = null) {
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to red must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return new Less_Tree_Dimension( $color->rgb[0] );
-	}
-
-	public function green($color = null) {
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to green must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return new Less_Tree_Dimension( $color->rgb[1] );
-	}
-
-	public function blue($color = null) {
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to blue must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return new Less_Tree_Dimension( $color->rgb[2] );
-	}
-
-	public function alpha($color = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to alpha must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$c = $color->toHSL();
-		return new Less_Tree_Dimension($c['a']);
-	}
-
-	public function luma ($color = null) {
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to luma must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return new Less_Tree_Dimension(Less_Parser::round( $color->luma() * $color->alpha * 100), '%');
-	}
-
-	public function luminance( $color = null ){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to luminance must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$luminance =
-			(0.2126 * $color->rgb[0] / 255)
-		  + (0.7152 * $color->rgb[1] / 255)
-		  + (0.0722 * $color->rgb[2] / 255);
-
-		return new Less_Tree_Dimension(Less_Parser::round( $luminance * $color->alpha * 100), '%');
-	}
-
-	public function saturate($color = null, $amount = null){
-		// filter: saturate(3.2);
-		// should be kept as is, so check for color
-		if ($color instanceof Less_Tree_Dimension) {
-			return null;
-		}
-
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to saturate must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$amount instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The second argument to saturate must be a percentage' . ($amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsl = $color->toHSL();
-
-		$hsl['s'] += $amount->value / 100;
-		$hsl['s'] = self::clamp($hsl['s']);
-
-		return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
-	}
-
-	/**
-	 * @param Less_Tree_Dimension $amount
-	 */
-	public function desaturate($color = null, $amount = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to desaturate must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$amount instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The second argument to desaturate must be a percentage' . ($amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsl = $color->toHSL();
-
-		$hsl['s'] -= $amount->value / 100;
-		$hsl['s'] = self::clamp($hsl['s']);
-
-		return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
-	}
-
-
-
-	public function lighten($color = null, $amount=null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to lighten must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$amount instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The second argument to lighten must be a percentage' . ($amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsl = $color->toHSL();
-
-		$hsl['l'] += $amount->value / 100;
-		$hsl['l'] = self::clamp($hsl['l']);
-
-		return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
-	}
-
-	public function darken($color = null, $amount = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to darken must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$amount instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The second argument to darken must be a percentage' . ($amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsl = $color->toHSL();
-		$hsl['l'] -= $amount->value / 100;
-		$hsl['l'] = self::clamp($hsl['l']);
-
-		return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
-	}
-
-	public function fadein($color = null, $amount = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to fadein must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$amount instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The second argument to fadein must be a percentage' . ($amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsl = $color->toHSL();
-		$hsl['a'] += $amount->value / 100;
-		$hsl['a'] = self::clamp($hsl['a']);
-		return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
-	}
-
-	public function fadeout($color = null, $amount = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to fadeout must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$amount instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The second argument to fadeout must be a percentage' . ($amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsl = $color->toHSL();
-		$hsl['a'] -= $amount->value / 100;
-		$hsl['a'] = self::clamp($hsl['a']);
-		return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
-	}
-
-	public function fade($color = null, $amount = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to fade must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$amount instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The second argument to fade must be a percentage' . ($amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsl = $color->toHSL();
-
-		$hsl['a'] = $amount->value / 100;
-		$hsl['a'] = self::clamp($hsl['a']);
-		return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
-	}
-
-
-
-	public function spin($color = null, $amount = null){
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to spin must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$amount instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The second argument to spin must be a number' . ($amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$hsl = $color->toHSL();
-		$hue = fmod($hsl['h'] + $amount->value, 360);
-
-		$hsl['h'] = $hue < 0 ? 360 + $hue : $hue;
-
-		return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
-	}
-
-	//
-	// Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
-	// http://sass-lang.com
-	//
-
-	/**
-	 * @param Less_Tree_Color $color1
-	 */
-	public function mix($color1 = null, $color2 = null, $weight = null){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to mix must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to mix must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$weight) {
-			$weight = new Less_Tree_Dimension('50', '%');
-		}
-		if (!$weight instanceof Less_Tree_Dimension) {
-			throw new Less_Exception_Compiler('The third argument to contrast must be a percentage' . ($weight instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		$p = $weight->value / 100.0;
-		$w = $p * 2 - 1;
-		$hsl1 = $color1->toHSL();
-		$hsl2 = $color2->toHSL();
-		$a = $hsl1['a'] - $hsl2['a'];
-
-		$w1 = (((($w * $a) == -1) ? $w : ($w + $a) / (1 + $w * $a)) + 1) / 2;
-		$w2 = 1 - $w1;
-
-		$rgb = array($color1->rgb[0] * $w1 + $color2->rgb[0] * $w2,
-					 $color1->rgb[1] * $w1 + $color2->rgb[1] * $w2,
-					 $color1->rgb[2] * $w1 + $color2->rgb[2] * $w2);
-
-		$alpha = $color1->alpha * $p + $color2->alpha * (1 - $p);
-
-		return new Less_Tree_Color($rgb, $alpha);
-	}
-
-	public function greyscale($color){
-		return $this->desaturate($color, new Less_Tree_Dimension(100,'%'));
-	}
-
-
-	public function contrast( $color, $dark = null, $light = null, $threshold = null){
-		// filter: contrast(3.2);
-		// should be kept as is, so check for color
-		if (!$color instanceof Less_Tree_Color) {
-			return null;
-		}
-		if( !$light ){
-			$light = $this->rgba(255, 255, 255, 1.0);
-		}
-		if( !$dark ){
-			$dark = $this->rgba(0, 0, 0, 1.0);
-		}
-
-		if (!$dark instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to contrast must be a color' . ($dark instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$light instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The third argument to contrast must be a color' . ($light instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		//Figure out which is actually light and dark!
-		if( $dark->luma() > $light->luma() ){
-			$t = $light;
-			$light = $dark;
-			$dark = $t;
-		}
-		if( !$threshold ){
-			$threshold = 0.43;
-		} else {
-			$threshold = Less_Functions::number($threshold);
-		}
-
-		if( $color->luma() < $threshold ){
-			return $light;
-		} else {
-			return $dark;
-		}
-	}
-
-	public function e ($str){
-		if( is_string($str) ){
-			return new Less_Tree_Anonymous($str);
-		}
-		return new Less_Tree_Anonymous($str instanceof Less_Tree_JavaScript ? $str->expression : $str->value);
-	}
-
-	public function escape ($str){
-
-		$revert = array('%21'=>'!', '%2A'=>'*', '%27'=>"'",'%3F'=>'?','%26'=>'&','%2C'=>',','%2F'=>'/','%40'=>'@','%2B'=>'+','%24'=>'$');
-
-		return new Less_Tree_Anonymous(strtr(rawurlencode($str->value), $revert));
-	}
-
-
-	/**
-	 * todo: This function will need some additional work to make it work the same as less.js
-	 *
-	 */
-	public function replace( $string, $pattern, $replacement, $flags = null ){
-		$result = $string->value;
-
-		$expr = '/'.str_replace('/','\\/',$pattern->value).'/';
-		if( $flags && $flags->value){
-			$expr .= self::replace_flags($flags->value);
-		}
-
-		$result = preg_replace($expr,$replacement->value,$result);
-
-
-		if( property_exists($string,'quote') ){
-			return new Less_Tree_Quoted( $string->quote, $result, $string->escaped);
-		}
-		return new Less_Tree_Quoted( '', $result );
-	}
-
-	public static function replace_flags($flags){
-		$flags = str_split($flags,1);
-		$new_flags = '';
-
-		foreach($flags as $flag){
-			switch($flag){
-				case 'e':
-				case 'g':
-				break;
-
-				default:
-				$new_flags .= $flag;
-				break;
-			}
-		}
-
-		return $new_flags;
-	}
-
-	public function _percent(){
-		$string = func_get_arg(0);
-
-		$args = func_get_args();
-		array_shift($args);
-		$result = $string->value;
-
-		foreach($args as $arg){
-			if( preg_match('/%[sda]/i',$result, $token) ){
-				$token = $token[0];
-				$value = stristr($token, 's') ? $arg->value : $arg->toCSS();
-				$value = preg_match('/[A-Z]$/', $token) ? urlencode($value) : $value;
-				$result = preg_replace('/%[sda]/i',$value, $result, 1);
-			}
-		}
-		$result = str_replace('%%', '%', $result);
-
-		return new Less_Tree_Quoted( $string->quote , $result, $string->escaped);
-	}
-
-	public function unit( $val, $unit = null) {
-		if( !($val instanceof Less_Tree_Dimension) ){
-			throw new Less_Exception_Compiler('The first argument to unit must be a number' . ($val instanceof Less_Tree_Operation ? '. Have you forgotten parenthesis?' : '.') );
-		}
-
-		if( $unit ){
-			if( $unit instanceof Less_Tree_Keyword ){
-				$unit = $unit->value;
-			} else {
-				$unit = $unit->toCSS();
-			}
-		} else {
-			$unit = "";
-		}
-		return new Less_Tree_Dimension($val->value, $unit );
-	}
-
-	public function convert($val, $unit){
-		return $val->convertTo($unit->value);
-	}
-
-	public function round($n, $f = false) {
-
-		$fraction = 0;
-		if( $f !== false ){
-			$fraction = $f->value;
-		}
-
-		return $this->_math('Less_Parser::round',null, $n, $fraction);
-	}
-
-	public function pi(){
-		return new Less_Tree_Dimension(M_PI);
-	}
-
-	public function mod($a, $b) {
-		return new Less_Tree_Dimension( $a->value % $b->value, $a->unit);
-	}
-
-
-
-	public function pow($x, $y) {
-		if( is_numeric($x) && is_numeric($y) ){
-			$x = new Less_Tree_Dimension($x);
-			$y = new Less_Tree_Dimension($y);
-		}elseif( !($x instanceof Less_Tree_Dimension) || !($y instanceof Less_Tree_Dimension) ){
-			throw new Less_Exception_Compiler('Arguments must be numbers');
-		}
-
-		return new Less_Tree_Dimension( pow($x->value, $y->value), $x->unit );
-	}
-
-	// var mathFunctions = [{name:"ce ...
-	public function ceil( $n ){		return $this->_math('ceil', null, $n); }
-	public function floor( $n ){	return $this->_math('floor', null, $n); }
-	public function sqrt( $n ){		return $this->_math('sqrt', null, $n); }
-	public function abs( $n ){		return $this->_math('abs', null, $n); }
-
-	public function tan( $n ){		return $this->_math('tan', '', $n);	}
-	public function sin( $n ){		return $this->_math('sin', '', $n);	}
-	public function cos( $n ){		return $this->_math('cos', '', $n);	}
-
-	public function atan( $n ){		return $this->_math('atan', 'rad', $n);	}
-	public function asin( $n ){		return $this->_math('asin', 'rad', $n);	}
-	public function acos( $n ){		return $this->_math('acos', 'rad', $n);	}
-
-	private function _math() {
-		$args = func_get_args();
-		$fn = array_shift($args);
-		$unit = array_shift($args);
-
-		if ($args[0] instanceof Less_Tree_Dimension) {
-
-			if( $unit === null ){
-				$unit = $args[0]->unit;
-			}else{
-				$args[0] = $args[0]->unify();
-			}
-			$args[0] = (float)$args[0]->value;
-			return new Less_Tree_Dimension( call_user_func_array($fn, $args), $unit);
-		} else if (is_numeric($args[0])) {
-			return call_user_func_array($fn,$args);
-		} else {
-			throw new Less_Exception_Compiler("math functions take numbers as parameters");
-		}
-	}
-
-	/**
-	 * @param boolean $isMin
-	 */
-	private function _minmax( $isMin, $args ){
-
-		$arg_count = count($args);
-
-		if( $arg_count < 1 ){
-			throw new Less_Exception_Compiler( 'one or more arguments required');
-		}
-
-		$j = null;
-		$unitClone = null;
-		$unitStatic = null;
-
-
-		$order = array();	// elems only contains original argument values.
-		$values = array();	// key is the unit.toString() for unified tree.Dimension values,
-							// value is the index into the order array.
-
-
-		for( $i = 0; $i < $arg_count; $i++ ){
-			$current = $args[$i];
-			if( !($current instanceof Less_Tree_Dimension) ){
-				if( is_array($args[$i]->value) ){
-					$args[] = $args[$i]->value;
-				}
-				continue;
-			}
-
-			if( $current->unit->toString() === '' && !$unitClone ){
-				$temp = new Less_Tree_Dimension($current->value, $unitClone);
-				$currentUnified = $temp->unify();
-			}else{
-				$currentUnified = $current->unify();
-			}
-
-			if( $currentUnified->unit->toString() === "" && !$unitStatic ){
-				$unit = $unitStatic;
-			}else{
-				$unit = $currentUnified->unit->toString();
-			}
-
-			if( $unit !== '' && !$unitStatic || $unit !== '' && $order[0]->unify()->unit->toString() === "" ){
-				$unitStatic = $unit;
-			}
-
-			if( $unit != '' && !$unitClone ){
-				$unitClone = $current->unit->toString();
-			}
-
-			if( isset($values['']) && $unit !== '' && $unit === $unitStatic ){
-				$j = $values[''];
-			}elseif( isset($values[$unit]) ){
-				$j = $values[$unit];
-			}else{
-
-				if( $unitStatic && $unit !== $unitStatic ){
-					throw new Less_Exception_Compiler( 'incompatible types');
-				}
-				$values[$unit] = count($order);
-				$order[] = $current;
-				continue;
-			}
-
-
-			if( $order[$j]->unit->toString() === "" && $unitClone ){
-				$temp = new Less_Tree_Dimension( $order[$j]->value, $unitClone);
-				$referenceUnified = $temp->unify();
-			}else{
-				$referenceUnified = $order[$j]->unify();
-			}
-			if( ($isMin && $currentUnified->value < $referenceUnified->value) || (!$isMin && $currentUnified->value > $referenceUnified->value) ){
-				$order[$j] = $current;
-			}
-		}
-
-		if( count($order) == 1 ){
-			return $order[0];
-		}
-		$args = array();
-		foreach($order as $a){
-			$args[] = $a->toCSS($this->env);
-		}
-		return new Less_Tree_Anonymous( ($isMin?'min(':'max(') . implode(Less_Environment::$_outputMap[','],$args).')');
-	}
-
-	public function min(){
-		$args = func_get_args();
-		return $this->_minmax( true, $args );
-	}
-
-	public function max(){
-		$args = func_get_args();
-		return $this->_minmax( false, $args );
-	}
-
-	public function getunit($n){
-		return new Less_Tree_Anonymous($n->unit);
-	}
-
-	public function argb($color) {
-		if (!$color instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to argb must be a color' . ($color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return new Less_Tree_Anonymous($color->toARGB());
-	}
-
-	public function percentage($n) {
-		return new Less_Tree_Dimension($n->value * 100, '%');
-	}
-
-	public function color($n) {
-
-		if( $n instanceof Less_Tree_Quoted ){
-			$colorCandidate = $n->value;
-			$returnColor = Less_Tree_Color::fromKeyword($colorCandidate);
-			if( $returnColor ){
-				return $returnColor;
-			}
-			if( preg_match('/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/',$colorCandidate) ){
-				return new Less_Tree_Color(substr($colorCandidate, 1));
-			}
-			throw new Less_Exception_Compiler("argument must be a color keyword or 3/6 digit hex e.g. #FFF");
-		} else {
-			throw new Less_Exception_Compiler("argument must be a string");
-		}
-	}
-
-
-	public function iscolor($n) {
-		return $this->_isa($n, 'Less_Tree_Color');
-	}
-
-	public function isnumber($n) {
-		return $this->_isa($n, 'Less_Tree_Dimension');
-	}
-
-	public function isstring($n) {
-		return $this->_isa($n, 'Less_Tree_Quoted');
-	}
-
-	public function iskeyword($n) {
-		return $this->_isa($n, 'Less_Tree_Keyword');
-	}
-
-	public function isurl($n) {
-		return $this->_isa($n, 'Less_Tree_Url');
-	}
-
-	public function ispixel($n) {
-		return $this->isunit($n, 'px');
-	}
-
-	public function ispercentage($n) {
-		return $this->isunit($n, '%');
-	}
-
-	public function isem($n) {
-		return $this->isunit($n, 'em');
-	}
-
-	/**
-	 * @param string $unit
-	 */
-	public function isunit( $n, $unit ){
-
-		if( is_object($unit) && property_exists($unit,'value') ){
-			$unit = $unit->value;
-		}
-
-		return ($n instanceof Less_Tree_Dimension) && $n->unit->is($unit) ? new Less_Tree_Keyword('true') : new Less_Tree_Keyword('false');
-	}
-
-	/**
-	 * @param string $type
-	 */
-	private function _isa($n, $type) {
-		return is_a($n, $type) ? new Less_Tree_Keyword('true') : new Less_Tree_Keyword('false');
-	}
-
-	public function tint($color, $amount = null) {
-		return $this->mix( $this->rgb(255,255,255), $color, $amount);
-	}
-
-	public function shade($color, $amount = null) {
-		return $this->mix($this->rgb(0, 0, 0), $color, $amount);
-	}
-
-	public function extract($values, $index ){
-		$index = (int)$index->value - 1; // (1-based index)
-		// handle non-array values as an array of length 1
-		// return 'undefined' if index is invalid
-		if( property_exists($values,'value') && is_array($values->value) ){
-			if( isset($values->value[$index]) ){
-				return $values->value[$index];
-			}
-			return null;
-
-		}elseif( (int)$index === 0 ){
-			return $values;
-		}
-
-		return null;
-	}
-
-	public function length($values){
-		$n = (property_exists($values,'value') && is_array($values->value)) ? count($values->value) : 1;
-		return new Less_Tree_Dimension($n);
-	}
-
-	public function datauri($mimetypeNode, $filePathNode = null ) {
-
-		$filePath = ( $filePathNode ? $filePathNode->value : null );
-		$mimetype = $mimetypeNode->value;
-
-		$args = 2;
-		if( !$filePath ){
-			$filePath = $mimetype;
-			$args = 1;
-		}
-
-		$filePath = str_replace('\\','/',$filePath);
-		if( Less_Environment::isPathRelative($filePath) ){
-
-			if( Less_Parser::$options['relativeUrls'] ){
-				$temp = $this->currentFileInfo['currentDirectory'];
-			} else {
-				$temp = $this->currentFileInfo['entryPath'];
-			}
-
-			if( !empty($temp) ){
-				$filePath = Less_Environment::normalizePath(rtrim($temp,'/').'/'.$filePath);
-			}
-
-		}
-
-
-		// detect the mimetype if not given
-		if( $args < 2 ){
-
-			/* incomplete
-			$mime = require('mime');
-			mimetype = mime.lookup(path);
-
-			// use base 64 unless it's an ASCII or UTF-8 format
-			var charset = mime.charsets.lookup(mimetype);
-			useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0;
-			if (useBase64) mimetype += ';base64';
-			*/
-
-			$mimetype = Less_Mime::lookup($filePath);
-
-			$charset = Less_Mime::charsets_lookup($mimetype);
-			$useBase64 = !in_array($charset,array('US-ASCII', 'UTF-8'));
-			if( $useBase64 ){ $mimetype .= ';base64'; }
-
-		}else{
-			$useBase64 = preg_match('/;base64$/',$mimetype);
-		}
-
-
-		if( file_exists($filePath) ){
-			$buf = @file_get_contents($filePath);
-		}else{
-			$buf = false;
-		}
-
-
-		// IE8 cannot handle a data-uri larger than 32KB. If this is exceeded
-		// and the --ieCompat flag is enabled, return a normal url() instead.
-		$DATA_URI_MAX_KB = 32;
-		$fileSizeInKB = round( strlen($buf) / 1024 );
-		if( $fileSizeInKB >= $DATA_URI_MAX_KB ){
-			$url = new Less_Tree_Url( ($filePathNode ? $filePathNode : $mimetypeNode), $this->currentFileInfo);
-			return $url->compile($this);
-		}
-
-		if( $buf ){
-			$buf = $useBase64 ? base64_encode($buf) : rawurlencode($buf);
-			$filePath = '"data:' . $mimetype . ',' . $buf . '"';
-		}
-
-		return new Less_Tree_Url( new Less_Tree_Anonymous($filePath) );
-	}
-
-	//svg-gradient
-	public function svggradient( $direction ){
-
-		$throw_message = 'svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position]';
-		$arguments = func_get_args();
-
-		if( count($arguments) < 3 ){
-			throw new Less_Exception_Compiler( $throw_message );
-		}
-
-		$stops = array_slice($arguments,1);
-		$gradientType = 'linear';
-		$rectangleDimension = 'x="0" y="0" width="1" height="1"';
-		$useBase64 = true;
-		$directionValue = $direction->toCSS();
-
-
-		switch( $directionValue ){
-			case "to bottom":
-				$gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"';
-				break;
-			case "to right":
-				$gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"';
-				break;
-			case "to bottom right":
-				$gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"';
-				break;
-			case "to top right":
-				$gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"';
-				break;
-			case "ellipse":
-			case "ellipse at center":
-				$gradientType = "radial";
-				$gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"';
-				$rectangleDimension = 'x="-50" y="-50" width="101" height="101"';
-				break;
-			default:
-				throw new Less_Exception_Compiler( "svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center'" );
-		}
-
-		$returner = '<?xml version="1.0" ?>' .
-			'<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" viewBox="0 0 1 1" preserveAspectRatio="none">' .
-			'<' . $gradientType . 'Gradient id="gradient" gradientUnits="userSpaceOnUse" ' . $gradientDirectionSvg . '>';
-
-		for( $i = 0; $i < count($stops); $i++ ){
-			if( is_object($stops[$i]) && property_exists($stops[$i],'value') ){
-				$color = $stops[$i]->value[0];
-				$position = $stops[$i]->value[1];
-			}else{
-				$color = $stops[$i];
-				$position = null;
-			}
-
-			if( !($color instanceof Less_Tree_Color) || (!(($i === 0 || $i+1 === count($stops)) && $position === null) && !($position instanceof Less_Tree_Dimension)) ){
-				throw new Less_Exception_Compiler( $throw_message );
-			}
-			if( $position ){
-				$positionValue = $position->toCSS();
-			}elseif( $i === 0 ){
-				$positionValue = '0%';
-			}else{
-				$positionValue = '100%';
-			}
-			$alpha = $color->alpha;
-			$returner .= '<stop offset="' . $positionValue . '" stop-color="' . $color->toRGB() . '"' . ($alpha < 1 ? ' stop-opacity="' . $alpha . '"' : '') . '/>';
-		}
-
-		$returner .= '</' . $gradientType . 'Gradient><rect ' . $rectangleDimension . ' fill="url(#gradient)" /></svg>';
-
-
-		if( $useBase64 ){
-			$returner = "'data:image/svg+xml;base64,".base64_encode($returner)."'";
-		}else{
-			$returner = "'data:image/svg+xml,".$returner."'";
-		}
-
-		return new Less_Tree_URL( new Less_Tree_Anonymous( $returner ) );
-	}
-
-
-	/**
-	 * Php version of javascript's `encodeURIComponent` function
-	 *
-	 * @param string $string The string to encode
-	 * @return string The encoded string
-	 */
-	public static function encodeURIComponent($string){
-		$revert = array('%21' => '!', '%2A' => '*', '%27' => "'", '%28' => '(', '%29' => ')');
-		return strtr(rawurlencode($string), $revert);
-	}
-
-
-	// Color Blending
-	// ref: http://www.w3.org/TR/compositing-1
-
-	public function colorBlend( $mode, $color1, $color2 ){
-		$ab = $color1->alpha;	// backdrop
-		$as = $color2->alpha;	// source
-		$r = array();			// result
-
-		$ar = $as + $ab * (1 - $as);
-		for( $i = 0; $i < 3; $i++ ){
-			$cb = $color1->rgb[$i] / 255;
-			$cs = $color2->rgb[$i] / 255;
-			$cr = call_user_func( $mode, $cb, $cs );
-			if( $ar ){
-				$cr = ($as * $cs + $ab * ($cb - $as * ($cb + $cs - $cr))) / $ar;
-			}
-			$r[$i] = $cr * 255;
-		}
-
-		return new Less_Tree_Color($r, $ar);
-	}
-
-	public function multiply($color1 = null, $color2 = null ){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to multiply must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to multiply must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendMultiply'),  $color1, $color2 );
-	}
-
-	private function colorBlendMultiply($cb, $cs){
-		return $cb * $cs;
-	}
-
-	public function screen($color1 = null, $color2 = null ){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to screen must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to screen must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendScreen'),  $color1, $color2 );
-	}
-
-	private function colorBlendScreen( $cb, $cs){
-		return $cb + $cs - $cb * $cs;
-	}
-
-	public function overlay($color1 = null, $color2 = null){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to overlay must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to overlay must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendOverlay'),  $color1, $color2 );
-	}
-
-	private function colorBlendOverlay($cb, $cs ){
-		$cb *= 2;
-		return ($cb <= 1)
-			? $this->colorBlendMultiply($cb, $cs)
-			: $this->colorBlendScreen($cb - 1, $cs);
-	}
-
-	public function softlight($color1 = null, $color2 = null){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to softlight must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to softlight must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendSoftlight'),  $color1, $color2 );
-	}
-
-	private function colorBlendSoftlight($cb, $cs ){
-		$d = 1;
-		$e = $cb;
-		if( $cs > 0.5 ){
-			$e = 1;
-			$d = ($cb > 0.25) ? sqrt($cb)
-				: ((16 * $cb - 12) * $cb + 4) * $cb;
-		}
-		return $cb - (1 - 2 * $cs) * $e * ($d - $cb);
-	}
-
-	public function hardlight($color1 = null, $color2 = null){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to hardlight must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to hardlight must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendHardlight'),  $color1, $color2 );
-	}
-
-	private function colorBlendHardlight( $cb, $cs ){
-		return $this->colorBlendOverlay($cs, $cb);
-	}
-
-	public function difference($color1 = null, $color2 = null) {
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to difference must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to difference must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendDifference'),  $color1, $color2 );
-	}
-
-	private function colorBlendDifference( $cb, $cs ){
-		return abs($cb - $cs);
-	}
-
-	public function exclusion( $color1 = null, $color2 = null ){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to exclusion must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to exclusion must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendExclusion'),  $color1, $color2 );
-	}
-
-	private function colorBlendExclusion( $cb, $cs ){
-		return $cb + $cs - 2 * $cb * $cs;
-	}
-
-	public function average($color1 = null, $color2 = null){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to average must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to average must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendAverage'),  $color1, $color2 );
-	}
-
-	// non-w3c functions:
-	public function colorBlendAverage($cb, $cs ){
-		return ($cb + $cs) / 2;
-	}
-
-	public function negation($color1 = null, $color2 = null ){
-		if (!$color1 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The first argument to negation must be a color' . ($color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-		if (!$color2 instanceof Less_Tree_Color) {
-			throw new Less_Exception_Compiler('The second argument to negation must be a color' . ($color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '') );
-		}
-
-		return $this->colorBlend( array($this,'colorBlendNegation'),  $color1, $color2 );
-	}
-
-	public function colorBlendNegation($cb, $cs){
-		return 1 - abs($cb + $cs - 1);
-	}
-
-	// ~ End of Color Blending
-
-}