File modules/util/ui/minifier/JSMinifier.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 JSMinifier extends AbstractMinifier
     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_INDENTING_SPACES  = 128;
    15 
    16 
    17 	public function linkToSourcemap($sourcemap)
    18 	{
    19 		return "# sourceMappingURL=$sourcemap";
    20 	}
    21 
    22 	protected function compress($chars)
    23 	{
    24 		$sourceLine = 1;
    25 		$sourcePos  = 1;
    26 		$buffer     = '';
    27 		while( true ) {
    28 			if   ( empty( $chars ) )
    29 				break;
    30 
    31 			$char = array_shift( $chars );
    32 
    33 			if ($char == '/') {
    34 				$nextChar = array_shift( $chars );
    35 				if   ( $nextChar == '/' && $this->hasFlag(self::FLAG_REMOVE_LINE_COMMENTS )) {
    36 					// single-line comment
    37 					while(true) {
    38 						$nextChar = array_shift( $chars );
    39 						if   ( $nextChar == "\n" ) {
    40 							array_unshift($chars,$nextChar);
    41 							$sourceLine++;
    42 							break;
    43 						}
    44 					}
    45 				}
    46 				elseif   ( $nextChar == '*'  && $this->hasFlag( self::FLAG_REMOVE_MULTILINE_COMMENT)) {
    47 					// multi-line comment
    48 					while(true) {
    49 						$nextChar = array_shift( $chars );
    50 						if   ( $nextChar == "\n" ) {
    51 							if ( ! $this->hasFlag(self::FLAG_REMOVE_LINEBREAK ))
    52 								$buffer .= $nextChar; // leave line-break as it is.
    53 							$sourceLine++;
    54 						}
    55 						elseif   ( $nextChar == "*" ) {
    56 							$nextChar = array_shift( $chars );
    57 							if   ( $nextChar == "/" )
    58 								break;
    59 							else
    60 								// it's not the end of the multiline comment.
    61 								array_unshift($chars,$nextChar);
    62 						}
    63 					}
    64 				}
    65 				else {
    66 					// it's not a comment.
    67 					array_unshift($chars,$nextChar);
    68 					$buffer .= $char;
    69 				}
    70 			}
    71 			elseif ($char == "\t" &&  $this->hasFlag(self::FLAG_REMOVE_TABS)) {
    72 				;
    73 			}
    74 			elseif ($char == "\r" &&  $this->hasFlag(self::FLAG_REMOVE_LINEBREAK)) {
    75 				;
    76 			}
    77 			elseif ($char == "\n" &&  $this->hasFlag(self::FLAG_REMOVE_LINEBREAK)) {
    78 				;
    79 			} else {
    80 				$buffer .= $char;
    81 			}
    82 
    83 			// Strip indenting space.
    84 			if	( $char == "\n" && $this->hasFlag( self::FLAG_REMOVE_INDENTING_SPACES )) {
    85 				while(true) {
    86 					$nextChar = array_shift($chars);
    87 					if ($nextChar == " ") {
    88 						; // it's a blank, so we want to remove it.
    89 					}
    90 					else {
    91 						array_unshift($chars,$nextChar);
    92 						break;
    93 					}
    94 
    95 				}
    96 			}
    97 
    98 		}
    99 
   100 		// Change the link in import statements, it should point to the minified version
   101 		if   ( $this->hasFlag( self::FLAG_IMPORT_MIN_JS ))
   102 			$buffer = preg_replace('/^(import\s+\S+\s+from\s+"?\'?\S+)\.js/m','${1}.min.js',$buffer);
   103 		$this->addCompressedContent($buffer);
   104 	}
   105 }



Download modules/util/ui/minifier/JSMinifier.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.