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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