[5307] | 1 | <?php |
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| 2 | /** |
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| 3 | * xajaxCompress.php :: function to compress Javascript |
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| 4 | * |
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| 5 | * xajax version 0.2.4 |
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| 6 | * copyright (c) 2005 by Jared White & J. Max Wilson |
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| 7 | * http://www.xajaxproject.org |
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| 8 | * |
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| 9 | * xajax is an open source PHP class library for easily creating powerful |
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| 10 | * PHP-driven, web-based Ajax Applications. Using xajax, you can asynchronously |
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| 11 | * call PHP functions and update the content of your your webpage without |
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| 12 | * reloading the page. |
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| 13 | * |
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| 14 | * xajax is released under the terms of the LGPL license |
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| 15 | * http://www.gnu.org/copyleft/lesser.html#SEC3 |
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| 16 | * |
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| 17 | * This library is free software; you can redistribute it and/or |
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| 18 | * modify it under the terms of the GNU Lesser General Public |
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| 19 | * License as published by the Free Software Foundation; either |
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| 20 | * version 2.1 of the License, or (at your option) any later version. |
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| 21 | * |
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| 22 | * This library is distributed in the hope that it will be useful, |
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| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 25 | * Lesser General Public License for more details. |
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| 26 | * |
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| 27 | * You should have received a copy of the GNU Lesser General Public |
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| 28 | * License along with this library; if not, write to the Free Software |
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| 29 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 30 | * |
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| 31 | * @package xajax |
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| 32 | * @version $Id$ |
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| 33 | * @copyright Copyright (c) 2005-2006 by Jared White & J. Max Wilson |
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| 34 | * @license http://www.gnu.org/copyleft/lesser.html#SEC3 LGPL License |
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| 35 | */ |
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| 36 | |
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| 37 | /** |
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| 38 | * Compresses the Javascript code for more efficient delivery. |
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| 39 | * (used internally) |
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| 40 | * |
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| 41 | * @param string contains the Javascript code to compress |
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| 42 | */ |
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| 43 | function xajaxCompressJavascript($sJS) |
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| 44 | { |
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| 45 | //remove windows cariage returns |
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| 46 | $sJS = str_replace("\r","",$sJS); |
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| 47 | |
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| 48 | //array to store replaced literal strings |
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| 49 | $literal_strings = array(); |
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| 50 | |
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| 51 | //explode the string into lines |
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| 52 | $lines = explode("\n",$sJS); |
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| 53 | //loop through all the lines, building a new string at the same time as removing literal strings |
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| 54 | $clean = ""; |
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| 55 | $inComment = false; |
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| 56 | $literal = ""; |
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| 57 | $inQuote = false; |
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| 58 | $escaped = false; |
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| 59 | $quoteChar = ""; |
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| 60 | |
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| 61 | for($i=0;$i<count($lines);$i++) |
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| 62 | { |
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| 63 | $line = $lines[$i]; |
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| 64 | $inNormalComment = false; |
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| 65 | |
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| 66 | //loop through line's characters and take out any literal strings, replace them with ___i___ where i is the index of this string |
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| 67 | for($j=0;$j<strlen($line);$j++) |
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| 68 | { |
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| 69 | $c = substr($line,$j,1); |
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| 70 | $d = substr($line,$j,2); |
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| 71 | |
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| 72 | //look for start of quote |
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| 73 | if(!$inQuote && !$inComment) |
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| 74 | { |
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| 75 | //is this character a quote or a comment |
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| 76 | if(($c=="\"" || $c=="'") && !$inComment && !$inNormalComment) |
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| 77 | { |
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| 78 | $inQuote = true; |
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| 79 | $inComment = false; |
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| 80 | $escaped = false; |
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| 81 | $quoteChar = $c; |
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| 82 | $literal = $c; |
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| 83 | } |
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| 84 | else if($d=="/*" && !$inNormalComment) |
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| 85 | { |
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| 86 | $inQuote = false; |
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| 87 | $inComment = true; |
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| 88 | $escaped = false; |
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| 89 | $quoteChar = $d; |
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| 90 | $literal = $d; |
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| 91 | $j++; |
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| 92 | } |
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| 93 | else if($d=="//") //ignore string markers that are found inside comments |
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| 94 | { |
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| 95 | $inNormalComment = true; |
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| 96 | $clean .= $c; |
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| 97 | } |
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| 98 | else |
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| 99 | { |
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| 100 | $clean .= $c; |
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| 101 | } |
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| 102 | } |
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| 103 | else //allready in a string so find end quote |
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| 104 | { |
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| 105 | if($c == $quoteChar && !$escaped && !$inComment) |
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| 106 | { |
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| 107 | $inQuote = false; |
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| 108 | $literal .= $c; |
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| 109 | |
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| 110 | //subsitute in a marker for the string |
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| 111 | $clean .= "___" . count($literal_strings) . "___"; |
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| 112 | |
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| 113 | //push the string onto our array |
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| 114 | array_push($literal_strings,$literal); |
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| 115 | |
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| 116 | } |
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| 117 | else if($inComment && $d=="*/") |
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| 118 | { |
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| 119 | $inComment = false; |
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| 120 | $literal .= $d; |
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| 121 | |
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| 122 | //subsitute in a marker for the string |
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| 123 | $clean .= "___" . count($literal_strings) . "___"; |
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| 124 | |
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| 125 | //push the string onto our array |
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| 126 | array_push($literal_strings,$literal); |
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| 127 | |
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| 128 | $j++; |
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| 129 | } |
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| 130 | else if($c == "\\" && !$escaped) |
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| 131 | $escaped = true; |
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| 132 | else |
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| 133 | $escaped = false; |
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| 134 | |
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| 135 | $literal .= $c; |
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| 136 | } |
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| 137 | } |
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| 138 | if($inComment) $literal .= "\n"; |
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| 139 | $clean .= "\n"; |
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| 140 | } |
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| 141 | //explode the clean string into lines again |
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| 142 | $lines = explode("\n",$clean); |
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| 143 | |
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| 144 | //now process each line at a time |
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| 145 | for($i=0;$i<count($lines);$i++) |
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| 146 | { |
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| 147 | $line = $lines[$i]; |
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| 148 | |
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| 149 | //remove comments |
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| 150 | $line = preg_replace("/\/\/(.*)/","",$line); |
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| 151 | |
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| 152 | //strip leading and trailing whitespace |
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| 153 | $line = trim($line); |
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| 154 | |
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| 155 | //remove all whitespace with a single space |
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| 156 | $line = preg_replace("/\s+/"," ",$line); |
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| 157 | |
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| 158 | //remove any whitespace that occurs after/before an operator |
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| 159 | $line = preg_replace("/\s*([!\}\{;,&=\|\-\+\*\/\)\(:])\s*/","\\1",$line); |
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| 160 | |
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| 161 | $lines[$i] = $line; |
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| 162 | } |
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| 163 | |
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| 164 | //implode the lines |
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| 165 | $sJS = implode("\n",$lines); |
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| 166 | |
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| 167 | //make sure there is a max of 1 \n after each line |
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| 168 | $sJS = preg_replace("/[\n]+/","\n",$sJS); |
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| 169 | |
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| 170 | //strip out line breaks that immediately follow a semi-colon |
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| 171 | $sJS = preg_replace("/;\n/",";",$sJS); |
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| 172 | |
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| 173 | //curly brackets aren't on their own |
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| 174 | $sJS = preg_replace("/[\n]*\{[\n]*/","{",$sJS); |
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| 175 | |
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| 176 | //finally loop through and replace all the literal strings: |
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| 177 | for($i=0;$i<count($literal_strings);$i++) |
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| 178 | $sJS = str_replace("___".$i."___",$literal_strings[$i],$sJS); |
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| 179 | |
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| 180 | return $sJS; |
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| 181 | } |
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| 182 | ?> |
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