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File: Url.php
<?php

/**
 * Url
 *
 * @package Less
 * @subpackage tree
 */
class Less_Tree_Url extends Less_Tree {

	public $attrs;
	public $value;
	public $currentFileInfo;
	public $isEvald;
	public $type = 'Url';

	public function __construct( $value, $currentFileInfo = null, $isEvald = null ) {
		$this->value = $value;
		$this->currentFileInfo = $currentFileInfo;
		$this->isEvald = $isEvald;
	}

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

	/**
	 * @see Less_Tree::genCSS
	 */
	public function genCSS( $output ) {
		$output->add( 'url(' );
		$this->value->genCSS( $output );
		$output->add( ')' );
	}

	/**
	 * @param Less_Functions $ctx
	 */
	public function compile( $ctx ) {
		$val = $this->value->compile( $ctx );

		if ( !$this->isEvald ) {
			// Add the base path if the URL is relative
			if ( Less_Parser::$options['relativeUrls']
				&& $this->currentFileInfo
				&& is_string( $val->value )
				&& Less_Environment::isPathRelative( $val->value )
			) {
				$rootpath = $this->currentFileInfo['uri_root'];
				if ( !$val->quote ) {
					$rootpath = preg_replace( '/[\(\)\'"\s]/', '\\$1', $rootpath );
				}
				$val->value = $rootpath . $val->value;
			}

			$val->value = Less_Environment::normalizePath( $val->value );
		}

		// Add cache buster if enabled
		if ( Less_Parser::$options['urlArgs'] ) {
			if ( !preg_match( '/^\s*data:/', $val->value ) ) {
				$delimiter = strpos( $val->value, '?' ) === false ? '?' : '&';
				$urlArgs = $delimiter . Less_Parser::$options['urlArgs'];
				$hash_pos = strpos( $val->value, '#' );
				if ( $hash_pos !== false ) {
					$val->value = substr_replace( $val->value, $urlArgs, $hash_pos, 0 );
				} else {
					$val->value .= $urlArgs;
				}
			}
		}

		return new Less_Tree_URL( $val, $this->currentFileInfo, true );
	}

}