qrcode.chapril.org/vendor/wikimedia/less.php/lib/Less/Tree/Alpha.php

<?php
/**
 * @private
 */
class Less_Tree_Alpha extends Less_Tree {
	public $value;
	public $type = 'Alpha';

	public function __construct( $val ) {
		$this->value = $val;
	}

	// function accept( $visitor ){
	//	$this->value = $visitor->visit( $this->value );
	//}

	public function compile( $env ) {
		if ( is_object( $this->value ) ) {
			$this->value = $this->value->compile( $env );
		}

		return $this;
	}

	/**
	 * @see Less_Tree::genCSS
	 */
	public function genCSS( $output ) {
		$output->add( "alpha(opacity=" );

		if ( is_string( $this->value ) ) {
			$output->add( $this->value );
		} else {
			$this->value->genCSS( $output );
		}

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

	public function toCSS() {
		return "alpha(opacity=" . ( is_string( $this->value ) ? $this->value : $this->value->toCSS() ) . ")";
	}

}