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<?php

/**
 * Environment
 *
 * @package Less
 * @subpackage environment
 */
class Less_Environment{

//public $paths = array();				// option - unmodified - paths to search for imports on
	//public static $files = array();		// list of files that have been imported, used for import-once
	//public $rootpath;						// option - rootpath to append to URL's
	//public static $strictImports = null;	// option -
	//public $insecure;						// option - whether to allow imports from insecure ssl hosts
	//public $processImports;				// option - whether to process imports. if false then imports will not be imported
	//public $javascriptEnabled;			// option - whether JavaScript is enabled. if undefined, defaults to true
	//public $useFileCache;					// browser only - whether to use the per file session cache
	public $currentFileInfo;				// information about the current file - for error reporting and importing and making urls relative etc.

public $importMultiple = false; 		// whether we are currently importing multiple copies

/**
	 * @var array
	 */
	public $frames = array();

/**
	 * @var array
	 */
	public $mediaBlocks = array();

/**
	 * @var array
	 */
	public $mediaPath = array();

public static $parensStack = 0;

public static $tabLevel = 0;

public static $lastRule = false;

public static $_outputMap;

public static $mixin_stack = 0;

/**
	 * @var array
	 */
	public $functions = array();

public function Init(){

self::$parensStack = 0;
		self::$tabLevel = 0;
		self::$lastRule = false;
		self::$mixin_stack = 0;

if( Less_Parser::$options['compress'] ){

Less_Environment::$_outputMap = array(
				','	=> ',',
				': ' => ':',
				''  => '',
				' ' => ' ',
				':' => ' :',
				'+' => '+',
				'~' => '~',
				'>' => '>',
				'|' => '|',
		        '^' => '^',
		        '^^' => '^^'
			);

}else{

Less_Environment::$_outputMap = array(
				','	=> ', ',
				': ' => ': ',
				''  => '',
				' ' => ' ',
				':' => ' :',
				'+' => ' + ',
				'~' => ' ~ ',
				'>' => ' > ',
				'|' => '|',
		        '^' => ' ^ ',
		        '^^' => ' ^^ '
			);

}
	}

public function copyEvalEnv($frames = array() ){
		$new_env = new Less_Environment();
		$new_env->frames = $frames;
		return $new_env;
	}

public static function isMathOn(){
		return !Less_Parser::$options['strictMath'] || Less_Environment::$parensStack;
	}

public static function isPathRelative($path){
		return !preg_match('/^(?:[a-z-]+:|\/)/',$path);
	}

/**
	 * Canonicalize a path by resolving references to '/./', '/../'
	 * Does not remove leading "../"
	 * @param string path or url
	 * @return string Canonicalized path
	 *
	 */
	public static function normalizePath($path){

$segments = explode('/',$path);
		$segments = array_reverse($segments);

$path = array();
		$path_len = 0;

while( $segments ){
			$segment = array_pop($segments);
			switch( $segment ) {

case '.':
				break;

case '..':
					if( !$path_len || ( $path[$path_len-1] === '..') ){
						$path[] = $segment;
						$path_len++;
					}else{
						array_pop($path);
						$path_len--;
					}
				break;

default:
					$path[] = $segment;
					$path_len++;
				break;
			}
		}

return implode('/',$path);
	}

public function unshiftFrame($frame){
		array_unshift($this->frames, $frame);
	}

public function shiftFrame(){
		return array_shift($this->frames);
	}

}