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1 | <?php |
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2 | |||
3 | namespace MatthiasMullie\Minify; |
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4 | |||
5 | use MatthiasMullie\Minify\Exceptions\FileImportException; |
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6 | use MatthiasMullie\PathConverter\Converter; |
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7 | |||
8 | /** |
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9 | * CSS minifier. |
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10 | * |
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11 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
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12 | * |
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13 | * @author Matthias Mullie <[email protected]> |
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14 | * @author Tijs Verkoyen <[email protected]> |
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15 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
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16 | * @license MIT License |
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17 | */ |
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18 | class CSS extends Minify |
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19 | { |
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20 | /** |
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21 | * @var int |
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22 | */ |
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23 | protected $maxImportSize = 5; |
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24 | |||
25 | /** |
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26 | * @var string[] |
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27 | */ |
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28 | protected $importExtensions = array( |
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29 | 'gif' => 'data:image/gif', |
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30 | 'png' => 'data:image/png', |
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31 | 'jpe' => 'data:image/jpeg', |
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32 | 'jpg' => 'data:image/jpeg', |
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33 | 'jpeg' => 'data:image/jpeg', |
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34 | 'svg' => 'data:image/svg+xml', |
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35 | 'woff' => 'data:application/x-font-woff', |
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36 | 'tif' => 'image/tiff', |
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37 | 'tiff' => 'image/tiff', |
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38 | 'xbm' => 'image/x-xbitmap', |
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39 | ); |
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40 | |||
41 | /** |
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42 | * Set the maximum size if files to be imported. |
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43 | * |
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44 | * Files larger than this size (in kB) will not be imported into the CSS. |
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45 | * Importing files into the CSS as data-uri will save you some connections, |
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46 | * but we should only import relatively small decorative images so that our |
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47 | * CSS file doesn't get too bulky. |
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48 | * |
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49 | * @param int $size Size in kB |
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50 | */ |
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51 | public function setMaxImportSize($size) |
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52 | { |
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53 | $this->maxImportSize = $size; |
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54 | } |
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55 | |||
56 | /** |
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57 | * Set the type of extensions to be imported into the CSS (to save network |
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58 | * connections). |
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59 | * Keys of the array should be the file extensions & respective values |
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60 | * should be the data type. |
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61 | * |
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62 | * @param string[] $extensions Array of file extensions |
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63 | */ |
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64 | public function setImportExtensions(array $extensions) |
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65 | { |
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66 | $this->importExtensions = $extensions; |
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67 | } |
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68 | |||
69 | /** |
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70 | * Move any import statements to the top. |
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71 | * |
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72 | * @param string $content Nearly finished CSS content |
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73 | * |
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74 | * @return string |
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75 | */ |
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76 | protected function moveImportsToTop($content) |
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77 | { |
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78 | if (preg_match_all('/@import[^;]+;/', $content, $matches)) { |
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79 | // remove from content |
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80 | foreach ($matches[0] as $import) { |
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81 | $content = str_replace($import, '', $content); |
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82 | } |
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83 | |||
84 | // add to top |
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85 | $content = implode('', $matches[0]).$content; |
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86 | } |
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87 | |||
88 | return $content; |
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89 | } |
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90 | |||
91 | /** |
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92 | * Combine CSS from import statements. |
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93 | * |
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94 | * @import's will be loaded and their content merged into the original file, |
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95 | * to save HTTP requests. |
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96 | * |
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97 | * @param string $source The file to combine imports for |
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98 | * @param string $content The CSS content to combine imports for |
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99 | * @param string[] $parents Parent paths, for circular reference checks |
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100 | * |
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101 | * @return string |
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102 | * |
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103 | * @throws FileImportException |
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104 | */ |
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105 | protected function combineImports($source, $content, $parents) |
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106 | { |
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107 | $importRegexes = array( |
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108 | // @import url(xxx) |
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109 | '/ |
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110 | # import statement |
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111 | @import |
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112 | |||
113 | # whitespace |
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114 | \s+ |
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115 | |||
116 | # open url() |
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117 | url\( |
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118 | |||
119 | # (optional) open path enclosure |
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120 | (?P<quotes>["\']?) |
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121 | |||
122 | # fetch path |
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123 | (?P<path>.+?) |
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124 | |||
125 | # (optional) close path enclosure |
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126 | (?P=quotes) |
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127 | |||
128 | # close url() |
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129 | \) |
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130 | |||
131 | # (optional) trailing whitespace |
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132 | \s* |
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133 | |||
134 | # (optional) media statement(s) |
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135 | (?P<media>[^;]*) |
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136 | |||
137 | # (optional) trailing whitespace |
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138 | \s* |
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139 | |||
140 | # (optional) closing semi-colon |
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141 | ;? |
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142 | |||
143 | /ix', |
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144 | |||
145 | // @import 'xxx' |
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146 | '/ |
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147 | |||
148 | # import statement |
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149 | @import |
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150 | |||
151 | # whitespace |
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152 | \s+ |
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153 | |||
154 | # open path enclosure |
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155 | (?P<quotes>["\']) |
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156 | |||
157 | # fetch path |
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158 | (?P<path>.+?) |
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159 | |||
160 | # close path enclosure |
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161 | (?P=quotes) |
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162 | |||
163 | # (optional) trailing whitespace |
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164 | \s* |
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165 | |||
166 | # (optional) media statement(s) |
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167 | (?P<media>[^;]*) |
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168 | |||
169 | # (optional) trailing whitespace |
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170 | \s* |
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171 | |||
172 | # (optional) closing semi-colon |
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173 | ;? |
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174 | |||
175 | /ix', |
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176 | ); |
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177 | |||
178 | // find all relative imports in css |
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179 | $matches = array(); |
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180 | foreach ($importRegexes as $importRegex) { |
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181 | if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) { |
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182 | $matches = array_merge($matches, $regexMatches); |
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183 | } |
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184 | } |
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185 | |||
186 | $search = array(); |
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187 | $replace = array(); |
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188 | |||
189 | // loop the matches |
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190 | foreach ($matches as $match) { |
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191 | // get the path for the file that will be imported |
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192 | $importPath = dirname($source).'/'.$match['path']; |
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193 | |||
194 | // only replace the import with the content if we can grab the |
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195 | // content of the file |
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196 | if (!$this->canImportByPath($match['path']) || !$this->canImportFile($importPath)) { |
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197 | continue; |
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198 | } |
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199 | |||
200 | // check if current file was not imported previously in the same |
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201 | // import chain. |
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202 | if (in_array($importPath, $parents)) { |
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203 | throw new FileImportException('Failed to import file "'.$importPath.'": circular reference detected.'); |
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204 | } |
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205 | |||
206 | // grab referenced file & minify it (which may include importing |
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207 | // yet other @import statements recursively) |
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208 | $minifier = new static($importPath); |
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209 | $importContent = $minifier->execute($source, $parents); |
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210 | |||
211 | // check if this is only valid for certain media |
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212 | if (!empty($match['media'])) { |
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213 | $importContent = '@media '.$match['media'].'{'.$importContent.'}'; |
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214 | } |
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215 | |||
216 | // add to replacement array |
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217 | $search[] = $match[0]; |
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218 | $replace[] = $importContent; |
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219 | } |
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220 | |||
221 | // replace the import statements |
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222 | return str_replace($search, $replace, $content); |
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223 | } |
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224 | |||
225 | /** |
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226 | * Import files into the CSS, base64-ized. |
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227 | * |
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228 | * @url(image.jpg) images will be loaded and their content merged into the |
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229 | * original file, to save HTTP requests. |
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230 | * |
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231 | * @param string $source The file to import files for |
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232 | * @param string $content The CSS content to import files for |
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233 | * |
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234 | * @return string |
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235 | */ |
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236 | protected function importFiles($source, $content) |
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237 | { |
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238 | $extensions = array_keys($this->importExtensions); |
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239 | $regex = '/url\((["\']?)((?!["\']?data:).*?\.('.implode('|', $extensions).'))\\1\)/i'; |
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240 | if ($extensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) { |
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241 | var_dump($matches); |
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|
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242 | $search = array(); |
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243 | $replace = array(); |
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244 | |||
245 | // loop the matches |
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246 | foreach ($matches as $match) { |
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247 | // get the path for the file that will be imported |
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248 | $path = $match[2]; |
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249 | $path = dirname($source).'/'.$path; |
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250 | $extension = $match[3]; |
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251 | |||
252 | // only replace the import with the content if we're able to get |
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253 | // the content of the file, and it's relatively small |
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254 | if ($this->canImportFile($path) && $this->canImportBySize($path)) { |
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255 | // grab content && base64-ize |
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256 | $importContent = $this->load($path); |
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257 | $importContent = base64_encode($importContent); |
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258 | |||
259 | // build replacement |
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260 | $search[] = $match[0]; |
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261 | $replace[] = 'url('.$this->importExtensions[$extension].';base64,'.$importContent.')'; |
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262 | } |
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263 | } |
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264 | |||
265 | // replace the import statements |
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266 | $content = str_replace($search, $replace, $content); |
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267 | } |
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268 | |||
269 | return $content; |
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270 | } |
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271 | |||
272 | /** |
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273 | * Minify the data. |
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274 | * Perform CSS optimizations. |
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275 | * |
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276 | * @param string[optional] $path Path to write the data to |
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277 | * @param string[] $parents Parent paths, for circular reference checks |
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278 | * |
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279 | * @return string The minified data |
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280 | */ |
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281 | public function execute($path = null, $parents = array()) |
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282 | { |
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283 | $content = ''; |
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284 | |||
285 | // loop css data (raw data and files) |
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286 | foreach ($this->data as $source => $css) { |
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287 | /* |
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288 | * Let's first take out strings & comments, since we can't just remove |
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289 | * whitespace anywhere. If whitespace occurs inside a string, we should |
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290 | * leave it alone. E.g.: |
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291 | * p { content: "a test" } |
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292 | */ |
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293 | $this->extractStrings(); |
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294 | $this->stripComments(); |
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295 | $css = $this->replace($css); |
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296 | |||
297 | $css = $this->stripWhitespace($css); |
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298 | $css = $this->shortenHex($css); |
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299 | $css = $this->shortenZeroes($css); |
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300 | $css = $this->shortenFontWeights($css); |
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301 | $css = $this->stripEmptyTags($css); |
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302 | |||
303 | // restore the string we've extracted earlier |
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304 | $css = $this->restoreExtractedData($css); |
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305 | |||
306 | $source = is_int($source) ? '' : $source; |
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307 | $parents = $source ? array_merge($parents, array($source)) : $parents; |
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308 | $css = $this->combineImports($source, $css, $parents); |
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309 | $css = $this->importFiles($source, $css); |
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310 | |||
311 | /* |
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312 | * If we'll save to a new path, we'll have to fix the relative paths |
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313 | * to be relative no longer to the source file, but to the new path. |
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314 | * If we don't write to a file, fall back to same path so no |
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315 | * conversion happens (because we still want it to go through most |
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316 | * of the move code...) |
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317 | */ |
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318 | $converter = new Converter($source, $path ?: $source); |
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319 | $css = $this->move($converter, $css); |
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320 | |||
321 | // combine css |
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322 | $content .= $css; |
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323 | } |
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324 | |||
325 | $content = $this->moveImportsToTop($content); |
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326 | |||
327 | return $content; |
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328 | } |
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329 | |||
330 | /** |
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331 | * Moving a css file should update all relative urls. |
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332 | * Relative references (e.g. ../images/image.gif) in a certain css file, |
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333 | * will have to be updated when a file is being saved at another location |
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334 | * (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper). |
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335 | * |
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336 | * @param Converter $converter Relative path converter |
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337 | * @param string $content The CSS content to update relative urls for |
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338 | * |
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339 | * @return string |
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340 | */ |
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341 | protected function move(Converter $converter, $content) |
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342 | { |
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343 | /* |
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344 | * Relative path references will usually be enclosed by url(). @import |
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345 | * is an exception, where url() is not necessary around the path (but is |
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346 | * allowed). |
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347 | * This *could* be 1 regular expression, where both regular expressions |
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348 | * in this array are on different sides of a |. But we're using named |
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349 | * patterns in both regexes, the same name on both regexes. This is only |
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350 | * possible with a (?J) modifier, but that only works after a fairly |
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351 | * recent PCRE version. That's why I'm doing 2 separate regular |
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352 | * expressions & combining the matches after executing of both. |
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353 | */ |
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354 | $relativeRegexes = array( |
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355 | // url(xxx) |
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356 | '/ |
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357 | # open url() |
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358 | url\( |
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359 | |||
360 | \s* |
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361 | |||
362 | # open path enclosure |
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363 | (?P<quotes>["\'])? |
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364 | |||
365 | # fetch path |
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366 | (?P<path>.+?) |
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367 | |||
368 | # close path enclosure |
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369 | (?(quotes)(?P=quotes)) |
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370 | |||
371 | \s* |
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372 | |||
373 | # close url() |
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374 | \) |
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375 | |||
376 | /ix', |
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377 | |||
378 | // @import "xxx" |
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379 | '/ |
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380 | # import statement |
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381 | @import |
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382 | |||
383 | # whitespace |
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384 | \s+ |
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385 | |||
386 | # we don\'t have to check for @import url(), because the |
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387 | # condition above will already catch these |
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388 | |||
389 | # open path enclosure |
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390 | (?P<quotes>["\']) |
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391 | |||
392 | # fetch path |
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393 | (?P<path>.+?) |
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394 | |||
395 | # close path enclosure |
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396 | (?P=quotes) |
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397 | |||
398 | /ix', |
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399 | ); |
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400 | |||
401 | // find all relative urls in css |
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402 | $matches = array(); |
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403 | foreach ($relativeRegexes as $relativeRegex) { |
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404 | if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) { |
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405 | $matches = array_merge($matches, $regexMatches); |
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406 | } |
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407 | } |
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408 | |||
409 | $search = array(); |
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410 | $replace = array(); |
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411 | |||
412 | // loop all urls |
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413 | foreach ($matches as $match) { |
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414 | // determine if it's a url() or an @import match |
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415 | $type = (strpos($match[0], '@import') === 0 ? 'import' : 'url'); |
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416 | |||
417 | $url = $match['path']; |
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418 | if ($this->canImportByPath($url)) { |
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419 | // attempting to interpret GET-params makes no sense, so let's discard them for awhile |
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420 | $params = strrchr($url, '?'); |
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421 | $url = $params ? substr($url, 0, -strlen($params)) : $url; |
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422 | |||
423 | // fix relative url |
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424 | $url = $converter->convert($url); |
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425 | |||
426 | // now that the path has been converted, re-apply GET-params |
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427 | $url .= $params; |
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428 | } |
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429 | |||
430 | // build replacement |
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431 | $search[] = $match[0]; |
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432 | if ($type === 'url') { |
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433 | $replace[] = 'url('.$url.')'; |
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434 | } elseif ($type === 'import') { |
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435 | $replace[] = '@import "'.$url.'"'; |
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436 | } |
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437 | } |
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438 | |||
439 | // replace urls |
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440 | return str_replace($search, $replace, $content); |
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441 | } |
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442 | |||
443 | /** |
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444 | * Shorthand hex color codes. |
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445 | * #FF0000 -> #F00. |
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446 | * |
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447 | * @param string $content The CSS content to shorten the hex color codes for |
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448 | * |
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449 | * @return string |
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450 | */ |
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451 | protected function shortenHex($content) |
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452 | { |
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453 | $content = preg_replace('/(?<=[: ])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?=[; }])/i', '#$1$2$3', $content); |
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454 | |||
455 | // we can shorten some even more by replacing them with their color name |
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456 | $colors = array( |
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457 | '#F0FFFF' => 'azure', |
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458 | '#F5F5DC' => 'beige', |
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459 | '#A52A2A' => 'brown', |
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460 | '#FF7F50' => 'coral', |
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461 | '#FFD700' => 'gold', |
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462 | '#808080' => 'gray', |
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463 | '#008000' => 'green', |
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464 | '#4B0082' => 'indigo', |
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465 | '#FFFFF0' => 'ivory', |
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466 | '#F0E68C' => 'khaki', |
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467 | '#FAF0E6' => 'linen', |
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468 | '#800000' => 'maroon', |
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469 | '#000080' => 'navy', |
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470 | '#808000' => 'olive', |
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471 | '#CD853F' => 'peru', |
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472 | '#FFC0CB' => 'pink', |
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473 | '#DDA0DD' => 'plum', |
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474 | '#800080' => 'purple', |
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475 | '#F00' => 'red', |
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476 | '#FA8072' => 'salmon', |
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477 | '#A0522D' => 'sienna', |
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478 | '#C0C0C0' => 'silver', |
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479 | '#FFFAFA' => 'snow', |
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480 | '#D2B48C' => 'tan', |
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481 | '#FF6347' => 'tomato', |
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482 | '#EE82EE' => 'violet', |
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483 | '#F5DEB3' => 'wheat', |
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484 | ); |
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485 | |||
486 | return preg_replace_callback( |
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487 | '/(?<=[: ])('.implode(array_keys($colors), '|').')(?=[; }])/i', |
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488 | function ($match) use ($colors) { |
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489 | return $colors[strtoupper($match[0])]; |
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490 | }, |
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491 | $content |
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492 | ); |
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493 | } |
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494 | |||
495 | /** |
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496 | * Shorten CSS font weights. |
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497 | * |
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498 | * @param string $content The CSS content to shorten the font weights for |
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499 | * |
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500 | * @return string |
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501 | */ |
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502 | protected function shortenFontWeights($content) |
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503 | { |
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504 | $weights = array( |
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505 | 'normal' => 400, |
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506 | 'bold' => 700, |
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507 | ); |
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508 | |||
509 | $callback = function ($match) use ($weights) { |
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510 | return $match[1].$weights[$match[2]]; |
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511 | }; |
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512 | |||
513 | return preg_replace_callback('/(font-weight\s*:\s*)('.implode('|', array_keys($weights)).')(?=[;}])/', $callback, $content); |
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514 | } |
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515 | |||
516 | /** |
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517 | * Shorthand 0 values to plain 0, instead of e.g. -0em. |
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518 | * |
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519 | * @param string $content The CSS content to shorten the zero values for |
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520 | * |
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521 | * @return string |
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522 | */ |
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523 | protected function shortenZeroes($content) |
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524 | { |
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525 | // reusable bits of code throughout these regexes: |
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526 | // before & after are used to make sure we don't match lose unintended |
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527 | // 0-like values (e.g. in #000, or in http://url/1.0) |
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528 | // units can be stripped from 0 values, or used to recognize non 0 |
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529 | // values (where wa may be able to strip a .0 suffix) |
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530 | $before = '(?<=[:(, ])'; |
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531 | $after = '(?=[ ,);}])'; |
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532 | $units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)'; |
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533 | |||
534 | // strip units after zeroes (0px -> 0) |
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535 | // NOTE: it should be safe to remove all units for a 0 value, but in |
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536 | // practice, Webkit (especially Safari) seems to stumble over at least |
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537 | // 0%, potentially other units as well. Only stripping 'px' for now. |
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538 | // @see https://github.com/matthiasmullie/minify/issues/60 |
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539 | $content = preg_replace('/'.$before.'(-?0*(\.0+)?)(?<=0)px'.$after.'/', '\\1', $content); |
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540 | |||
541 | // strip 0-digits (.0 -> 0) |
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542 | $content = preg_replace('/'.$before.'\.0+'.$units.'?'.$after.'/', '0\\1', $content); |
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543 | // strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px |
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544 | $content = preg_replace('/'.$before.'(-?[0-9]+\.[0-9]+)0+'.$units.'?'.$after.'/', '\\1\\2', $content); |
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545 | // strip trailing 0: 50.00 -> 50, 50.00px -> 50px |
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546 | $content = preg_replace('/'.$before.'(-?[0-9]+)\.0+'.$units.'?'.$after.'/', '\\1\\2', $content); |
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547 | // strip leading 0: 0.1 -> .1, 01.1 -> 1.1 |
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548 | $content = preg_replace('/'.$before.'(-?)0+([0-9]*\.[0-9]+)'.$units.'?'.$after.'/', '\\1\\2\\3', $content); |
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549 | |||
550 | // strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0) |
||
551 | $content = preg_replace('/'.$before.'-?0+'.$units.'?'.$after.'/', '0\\1', $content); |
||
552 | |||
553 | // remove zeroes where they make no sense in calc: e.g. calc(100px - 0) |
||
554 | // the 0 doesn't have any effect, and this isn't even valid without unit |
||
555 | // strip all `+ 0` or `- 0` occurrences: calc(10% + 0) -> calc(10%) |
||
556 | // looped because there may be multiple 0s inside 1 group of parentheses |
||
557 | do { |
||
558 | $previous = $content; |
||
559 | $content = preg_replace('/\(([^\(\)]+)\s+[\+\-]\s+0(\s+[^\(\)]+)?\)/', '(\\1\\2)', $content); |
||
560 | } while ($content !== $previous); |
||
561 | // strip all `0 +` occurrences: calc(0 + 10%) -> calc(10%) |
||
562 | $content = preg_replace('/\(\s*0\s+\+\s+([^\(\)]+)\)/', '(\\1)', $content); |
||
563 | // strip all `0 -` occurrences: calc(0 - 10%) -> calc(-10%) |
||
564 | $content = preg_replace('/\(\s*0\s+\-\s+([^\(\)]+)\)/', '(-\\1)', $content); |
||
565 | // I'm not going to attempt to optimize away `x * 0` instances: |
||
566 | // it's dumb enough code already that it likely won't occur, and it's |
||
567 | // too complex to do right (order of operations would have to be |
||
568 | // respected etc) |
||
569 | // what I cared about most here was fixing incorrectly truncated units |
||
570 | |||
571 | return $content; |
||
572 | } |
||
573 | |||
574 | /** |
||
575 | * Strip comments from source code. |
||
576 | * |
||
577 | * @param string $content |
||
578 | * |
||
579 | * @return string |
||
580 | */ |
||
581 | protected function stripEmptyTags($content) |
||
582 | { |
||
583 | return preg_replace('/(^|\}|;)[^\{\};]+\{\s*\}/', '\\1', $content); |
||
584 | } |
||
585 | |||
586 | /** |
||
587 | * Strip comments from source code. |
||
588 | */ |
||
589 | protected function stripComments() |
||
590 | { |
||
591 | $this->registerPattern('/\/\*.*?\*\//s', ''); |
||
592 | } |
||
593 | |||
594 | /** |
||
595 | * Strip whitespace. |
||
596 | * |
||
597 | * @param string $content The CSS content to strip the whitespace for |
||
598 | * |
||
599 | * @return string |
||
600 | */ |
||
601 | protected function stripWhitespace($content) |
||
602 | { |
||
603 | // remove leading & trailing whitespace |
||
604 | $content = preg_replace('/^\s*/m', '', $content); |
||
605 | $content = preg_replace('/\s*$/m', '', $content); |
||
606 | |||
607 | // replace newlines with a single space |
||
608 | $content = preg_replace('/\s+/', ' ', $content); |
||
609 | |||
610 | // remove whitespace around meta characters |
||
611 | // inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex |
||
612 | $content = preg_replace('/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content); |
||
613 | $content = preg_replace('/([\[(:])\s+/', '$1', $content); |
||
614 | $content = preg_replace('/\s+([\]\)])/', '$1', $content); |
||
615 | $content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content); |
||
616 | |||
617 | // whitespace around + and - can only be stripped in selectors, like |
||
618 | // :nth-child(3+2n), not in things like calc(3px + 2px) or shorthands |
||
619 | // like 3px -2px |
||
620 | $content = preg_replace('/\s*([+-])\s*(?=[^}]*{)/', '$1', $content); |
||
621 | |||
622 | // remove semicolon/whitespace followed by closing bracket |
||
623 | $content = str_replace(';}', '}', $content); |
||
624 | |||
625 | return trim($content); |
||
626 | } |
||
627 | |||
628 | /** |
||
629 | * Check if file is small enough to be imported. |
||
630 | * |
||
631 | * @param string $path The path to the file |
||
632 | * |
||
633 | * @return bool |
||
634 | */ |
||
635 | protected function canImportBySize($path) |
||
636 | { |
||
637 | return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024; |
||
638 | } |
||
639 | |||
640 | /** |
||
641 | * Check if file a file can be imported, going by the path. |
||
642 | * |
||
643 | * @param string $path |
||
644 | * |
||
645 | * @return bool |
||
646 | */ |
||
647 | protected function canImportByPath($path) |
||
648 | { |
||
649 | return preg_match('/^(data:|https?:|\\/)/', $path) === 0; |
||
650 | } |
||
651 | } |
||
652 |