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Edit File: Call.php

<?php

/**
 * Call
 *
 * @package Less
 * @subpackage tree
 */
class Less_Tree_Call extends Less_Tree{
    public $value;

public $name;
    public $args;
    public $index;
    public $currentFileInfo;
    public $type = 'Call';

public function __construct($name, $args, $index, $currentFileInfo = null ){
		$this->name = $name;
		$this->args = $args;
		$this->index = $index;
		$this->currentFileInfo = $currentFileInfo;
	}

public function accept( $visitor ){
		$this->args = $visitor->visitArray( $this->args );
	}

//
    // When evaluating a function call,
    // we either find the function in `tree.functions` [1],
    // in which case we call it, passing the  evaluated arguments,
    // or we simply print it out as it appeared originally [2].
    //
    // The *functions.js* file contains the built-in functions.
    //
    // The reason why we evaluate the arguments, is in the case where
    // we try to pass a variable to a function, like: `saturate(@color)`.
    // The function should receive the value, not the variable.
    //
    public function compile($env=null){
		$args = array();
		foreach($this->args as $a){
			$args[] = $a->compile($env);
		}

$nameLC = strtolower($this->name);
		switch($nameLC){
			case '%':
			$nameLC = '_percent';
			break;

case 'get-unit':
			$nameLC = 'getunit';
			break;

case 'data-uri':
			$nameLC = 'datauri';
			break;

case 'svg-gradient':
			$nameLC = 'svggradient';
			break;
		}

$result = null;
		if( $nameLC === 'default' ){
			$result = Less_Tree_DefaultFunc::compile();

}else{

if( method_exists('Less_Functions',$nameLC) ){ // 1.
				try {

$func = new Less_Functions($env, $this->currentFileInfo);
					$result = call_user_func_array( array($func,$nameLC),$args);

} catch (Exception $e) {
					throw new Less_Exception_Compiler('error evaluating function `' . $this->name . '` '.$e->getMessage().' index: '. $this->index);
				}
			} elseif( isset( $env->functions[$nameLC] ) && is_callable( $env->functions[$nameLC] ) ) {
				try {
					$result = call_user_func_array( $env->functions[$nameLC], $args );
				} catch (Exception $e) {
					throw new Less_Exception_Compiler('error evaluating function `' . $this->name . '` '.$e->getMessage().' index: '. $this->index);
				}
			}
		}

if( $result !== null ){
			return $result;
		}

return new Less_Tree_Call( $this->name, $args, $this->index, $this->currentFileInfo );
    }

/**
     * @see Less_Tree::genCSS
     */
	public function genCSS( $output ){

$output->add( $this->name . '(', $this->currentFileInfo, $this->index );
		$args_len = count($this->args);
		for($i = 0; $i < $args_len; $i++ ){
			$this->args[$i]->genCSS( $output );
			if( $i + 1 < $args_len ){
				$output->add( ', ' );
			}
		}

$output->add( ')' );
	}

//public function toCSS(){
    //    return $this->compile()->toCSS();
    //}

}

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