File modules/util/ui/minifier/CSSMinifier.class.php

Last commit: Sun Oct 13 13:17:32 2024 +0200	Jan Dankert	New Minifier for CSS and JS: Leave JS Linebreaks as they are (for better debugging); Exploded CSS files (instead of a combined one), LESS is necessary but should be avoided in the future.


     1 <?php
     2 
     3 namespace util\ui\minifier;
     4 
     5 class CSSMinifier extends AbstractMinifier
     6 {
     7 	const FLAG_REMOVE_MULTILINE_COMMENT = 2;
     8 	const FLAG_REMOVE_BLANK_LINES       = 4;
     9 	const FLAG_REMOVE_LINE_COMMENTS     = 8;
    10 	const FLAG_REMOVE_WHITESPACE        = 16;
    11 	const FLAG_REMOVE_LINEBREAK         = 32;
    12 	const FLAG_REMOVE_TABS              = 64;
    13 	const FLAG_REMOVE_SUPERFLOUS_SPACES = 128;
    14 
    15 	const REPLACER = [
    16 		self::FLAG_REMOVE_MULTILINE_COMMENT => ["/\/\*[\s\S]*?\*\//"           , ''               ],
    17 		self::FLAG_REMOVE_LINE_COMMENTS     => ["/^(.*)\/\/.*$/m"              ,'${1}'            ],
    18 		self::FLAG_REMOVE_BLANK_LINES       => ['/^\n+|^[\t\s]*\n+/m'          , ''               ],
    19 		self::FLAG_REMOVE_WHITESPACE        => ['/^\s*(.*)\s*$/m'              ,'${1}'            ],
    20 		self::FLAG_REMOVE_LINEBREAK         => ['/\n/'                         ,''                ],
    21 		self::FLAG_REMOVE_TABS              => ['/\t/'                         ,''                ],
    22 		self::FLAG_REMOVE_SUPERFLOUS_SPACES => ['/\s{2,}7'                     ,' '               ],
    23 	];
    24 
    25 
    26 	public function linkToSourcemap($sourcemap)
    27 	{
    28 		return "/*# sourceMappingURL=$sourcemap */";
    29 	}
    30 
    31 
    32 	protected function compress($chars)
    33 	{
    34 		$sourceLine = 1;
    35 		$sourcePos  = 1;
    36 		$buffer     = '';
    37 		while( true ) {
    38 			if   ( empty( $chars ) )
    39 				break;
    40 
    41 			$char = array_shift( $chars );
    42 
    43 			if ($char == '/') {
    44 				$nextChar = array_shift( $chars );
    45 				if   ( $nextChar == '/' && $this->hasFlag( self::FLAG_REMOVE_LINE_COMMENTS )) {
    46 					// single-line comment
    47 					while(true) {
    48 						$nextChar = array_shift( $chars );
    49 						if   ( $nextChar == "\n" ) {
    50 							$sourceLine++;
    51 							break;
    52 						}
    53 					}
    54 				}
    55 				elseif   ( $nextChar == '*'  && $this->hasFlag( self::FLAG_REMOVE_MULTILINE_COMMENT)) {
    56 					// multi-line comment
    57 					while(true) {
    58 						$nextChar = array_shift( $chars );
    59 						if   ( $nextChar == "\n" ) {
    60 							if ( ! $this->hasFlag( self::FLAG_REMOVE_LINEBREAK) )
    61 								$buffer .= $nextChar;
    62 						}
    63 						if   ( $nextChar == "*" ) {
    64 							$nextChar = array_shift( $chars );
    65 							if   ( $nextChar == "/" )
    66 								break;
    67 							else
    68 								// it's not the end of the multiline comment.
    69 								array_unshift($chars,$nextChar);
    70 						}
    71 					}
    72 				}
    73 				else {
    74 					array_unshift($chars,$nextChar);
    75 					$buffer .= $char;
    76 				}
    77 			}
    78 			elseif ($char == "\t" &&  $this->hasFlag(self::FLAG_REMOVE_TABS)) {
    79 				;
    80 			}
    81 			elseif ($char == "\r" &&  $this->hasFlag( self::FLAG_REMOVE_LINEBREAK)) {
    82 				;
    83 			}
    84 			elseif ($char == "\n" &&  $this->hasFlag( self::FLAG_REMOVE_LINEBREAK)) {
    85 				;
    86 			}
    87 			elseif ($char == " " && substr($buffer,-1,1)==' ' &&  $this->hasFlag(self::FLAG_REMOVE_SUPERFLOUS_SPACES)) {
    88 				;
    89 			} else {
    90 				$buffer .= $char;
    91 			}
    92 		}
    93 
    94 		if   ( $this->hasFlag(self::FLAG_REMOVE_LINE_COMMENTS ))
    95 			$buffer = preg_replace('/^(@import\s+\S+)\.less/m','${1}.min.css',$buffer);
    96 
    97 		$this->addCompressedContent($buffer);
    98 	}
    99 }



Download modules/util/ui/minifier/CSSMinifier.class.php


History
Sun, 13 Oct 2024 13:17:32 +0200	Jan Dankert	New Minifier for CSS and JS: Leave JS Linebreaks as they are (for better debugging); Exploded CSS files (instead of a combined one), LESS is necessary but should be avoided in the future.