Condition.php
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Condition.php
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	<?php
	/**
	* @private
	*/
	class Less_Tree_Condition extends Less_Tree {

	public $op;
	public $lvalue;
	public $rvalue;
	public $index;
	public $negate;

	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 );
	}

	/**
	* @param Less_Environment $env
	* @return bool
	* @see less-2.5.3.js#Condition.prototype.eval
	*/
	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:
	$res = Less_Tree::nodeCompare( $a, $b );
	// In JS, switch(undefined) with -1,0,-1,defaults goes to `default`.
	// In PHP, switch(null) would go to case 0. Use if/else instead.
	if ( $res === -1 ) {
	$result = $this->op === '<' \|\| $this->op === '=<' \|\| $this->op === '<=';
	} elseif ( $res === 0 ) {
	$result = $this->op === '=' \|\| $this->op === '>=' \|\| $this->op === '=<' \|\| $this->op === '<=';
	} elseif ( $res === 1 ) {
	$result = $this->op === '>' \|\| $this->op === '>=';
	} else {
	// null, NAN
	$result = false;
	}
	}

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

	}