File modules/util/JSMinifier.class.php

Last commit: Sat Dec 18 03:47:23 2021 +0100	dankert	New: Every ES6-Module should have a minified version for performance reasons. Bad: The Minifier "Jsqueeze" is unable to minify ES6-modules, so we had to implement a simple JS-Minifier which strips out all comments.


     1 <?php
     2 
     3 namespace util;
     4 
     5 class JSMinifier
     6 {
     7 	const FLAG_IMPORT_MIN_JS            = 1;
     8 	const FLAG_REMOVE_MULTILINE_COMMENT = 2;
     9 	const FLAG_REMOVE_BLANK_LINES       = 4;
    10 	const FLAG_REMOVE_LINE_COMMENTS     = 8;
    11 	const FLAG_REMOVE_WHITESPACE        = 16;
    12 	const FLAG_REMOVE_LINEBREAK         = 32;
    13 	const FLAG_REMOVE_TABS              = 64;
    14 	const FLAG_REMOVE_SUPERFLOUS_SPACES = 128;
    15 	const FLAG_ALL                      = 255;
    16 
    17 	const REPLACER = [
    18 		self::FLAG_REMOVE_MULTILINE_COMMENT => ["/\/\*[\s\S]*?\*\//"           , ''               ],
    19 		self::FLAG_REMOVE_LINE_COMMENTS     => ["/^(.*)\/\/.*$/m"              ,'${1}'            ],
    20 		self::FLAG_REMOVE_BLANK_LINES       => ['/^\n+|^[\t\s]*\n+/m'          , ''               ],
    21 		self::FLAG_IMPORT_MIN_JS            => ['/^(import.*from.*)\.js(.*)$/m','${1}.min.js${2}' ],
    22 		self::FLAG_REMOVE_WHITESPACE        => ['/^\s*(.*)\s*$/m'              ,'${1}'            ],
    23 		self::FLAG_REMOVE_LINEBREAK         => ['/\n/'                         ,''                ],
    24 		self::FLAG_REMOVE_TABS              => ['/\t/'                         ,''                ],
    25 		self::FLAG_REMOVE_SUPERFLOUS_SPACES => ['/\s{2,}7'                     ,' '               ],
    26 	];
    27 
    28 	/**
    29 	 * Which flags are enabled?
    30 	 * @var int
    31 	 */
    32 	public $config = self::FLAG_ALL;
    33 
    34 	public function __construct( $flags = null )
    35 	{
    36 		if   ( $flags )
    37 			$this->config = $flags;
    38 	}
    39 
    40 
    41 	public function minify( $code ) {
    42 		foreach( self::REPLACER as $flag => $replacer )
    43 			if   ( $this->config & $flag ) {
    44 				list( $replace, $with ) = $replacer;
    45 				$code = preg_replace( $replace, $with, $code );
    46 			}
    47 		return $code;
    48 	}
    49 }



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Sat, 18 Dec 2021 03:47:23 +0100	dankert	New: Every ES6-Module should have a minified version for performance reasons. Bad: The Minifier "Jsqueeze" is unable to minify ES6-modules, so we had to implement a simple JS-Minifier which strips out all comments.