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Edit File: Operation.php

<?php

/**
 * Operation
 *
 * @package Less
 * @subpackage tree
 */
class Less_Tree_Operation extends Less_Tree{

public $op;
	public $operands;
	public $isSpaced;
	public $type = 'Operation';

/**
	 * @param string $op
	 */
	public function __construct($op, $operands, $isSpaced = false){
		$this->op = trim($op);
		$this->operands = $operands;
		$this->isSpaced = $isSpaced;
	}

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

public function compile($env){
		$a = $this->operands[0]->compile($env);
		$b = $this->operands[1]->compile($env);

if( Less_Environment::isMathOn() ){

if( $a instanceof Less_Tree_Dimension && $b instanceof Less_Tree_Color ){
				$a = $a->toColor();

}elseif( $b instanceof Less_Tree_Dimension && $a instanceof Less_Tree_Color ){
				$b = $b->toColor();

}

if( !method_exists($a,'operate') ){
				throw new Less_Exception_Compiler("Operation on an invalid type");
			}

return $a->operate( $this->op, $b);
		}

return new Less_Tree_Operation($this->op, array($a, $b), $this->isSpaced );
	}

/**
     * @see Less_Tree::genCSS
     */
    public function genCSS( $output ){
		$this->operands[0]->genCSS( $output );
		if( $this->isSpaced ){
			$output->add( " " );
		}
		$output->add( $this->op );
		if( $this->isSpaced ){
			$output->add( ' ' );
		}
		$this->operands[1]->genCSS( $output );
	}

}

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