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name : Condition.php
 <?php

/**
 * Condition
 *
 * @package Less
 * @subpackage tree
 */
class Less_Tree_Condition extends Less_Tree{

	public $op;
	public $lvalue;
	public $rvalue;
	public $index;
	public $negate;
	public $type = 'Condition';

	public function __construct($op, $l, $r, $i = 0, $negate = false) {
		$this->op = trim($op);
		$this->lvalue = $l;
		$this->rvalue = $r;
		$this->index = $i;
		$this->negate = $negate;
	}

	public function accept($visitor){
		$this->lvalue = $visitor->visitObj( $this->lvalue );
		$this->rvalue = $visitor->visitObj( $this->rvalue );
	}

    public function compile($env) {
		$a = $this->lvalue->compile($env);
		$b = $this->rvalue->compile($env);

		switch( $this->op ){
			case 'and':
				$result = $a && $b;
			break;

			case 'or':
				$result = $a || $b;
			break;

			default:
				if( Less_Parser::is_method($a, 'compare') ){
					$result = $a->compare($b);
				}elseif( Less_Parser::is_method($b, 'compare') ){
					$result = $b->compare($a);
				}else{
					throw new Less_Exception_Compiler('Unable to perform comparison', null, $this->index);
				}

				switch ($result) {
					case -1:
					$result = $this->op === '<' || $this->op === '=<' || $this->op === '<=';
					break;

					case  0:
					$result = $this->op === '=' || $this->op === '>=' || $this->op === '=<' || $this->op === '<=';
					break;

					case  1:
					$result = $this->op === '>' || $this->op === '>=';
					break;
				}
			break;
		}

		return $this->negate ? !$result : $result;
    }

}
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