Attribute.php
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Attribute.php
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	<?php
	/**
	* @private
	* @see less-2.5.3.js#Attribute.prototype
	*/
	class Less_Tree_Attribute extends Less_Tree implements Less_Tree_HasValueProperty {
	public $key;
	public $op;
	public $value;

	/**
	* @param string $key
	* @param null\|string $op
	* @param null\|string\|Less_Tree $value
	*/
	public function __construct( $key, $op, $value ) {
	$this->key = $key;
	$this->op = $op;
	$this->value = $value;
	}

	public function compile( $env ) {
	// Optimization: Avoid object churn for the common case.
	// Attributes are very common in CSS/LESS input, but rarely involve dynamic values.
	if ( !$this->key instanceof Less_Tree && !$this->value instanceof Less_Tree ) {
	return $this;
	}

	return new self(
	$this->key instanceof Less_Tree ? $this->key->compile( $env ) : $this->key,
	$this->op,
	$this->value instanceof Less_Tree ? $this->value->compile( $env ) : $this->value );
	}

	public function genCSS( $output ) {
	$output->add( $this->toCSS() );
	}

	public function toCSS() {
	$value = $this->key;

	if ( $this->op ) {
	$value .= $this->op;
	$value .= ( is_object( $this->value ) ? $this->value->toCSS() : $this->value );
	}

	return '[' . $value . ']';
	}
	}