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597 | daniel-mar | 1 | <?php |
1042 | daniel-mar | 2 | |
597 | daniel-mar | 3 | /** |
1042 | daniel-mar | 4 | * Abstract minifier class. |
597 | daniel-mar | 5 | * |
6 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
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7 | * |
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8 | * @author Matthias Mullie <minify@mullie.eu> |
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9 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
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10 | * @license MIT License |
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11 | */ |
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1042 | daniel-mar | 12 | |
597 | daniel-mar | 13 | namespace MatthiasMullie\Minify; |
14 | |||
15 | use MatthiasMullie\Minify\Exceptions\IOException; |
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16 | use Psr\Cache\CacheItemInterface; |
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17 | |||
18 | /** |
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19 | * Abstract minifier class. |
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20 | * |
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21 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
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22 | * |
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23 | * @author Matthias Mullie <minify@mullie.eu> |
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24 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
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25 | * @license MIT License |
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26 | */ |
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27 | abstract class Minify |
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28 | { |
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29 | /** |
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30 | * The data to be minified. |
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31 | * |
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32 | * @var string[] |
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33 | */ |
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34 | protected $data = array(); |
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35 | |||
36 | /** |
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37 | * Array of patterns to match. |
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38 | * |
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39 | * @var string[] |
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40 | */ |
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41 | protected $patterns = array(); |
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42 | |||
43 | /** |
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44 | * This array will hold content of strings and regular expressions that have |
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45 | * been extracted from the JS source code, so we can reliably match "code", |
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46 | * without having to worry about potential "code-like" characters inside. |
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47 | * |
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1042 | daniel-mar | 48 | * @internal |
49 | * |
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597 | daniel-mar | 50 | * @var string[] |
51 | */ |
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52 | public $extracted = array(); |
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53 | |||
54 | /** |
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55 | * Init the minify class - optionally, code may be passed along already. |
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56 | */ |
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57 | public function __construct(/* $data = null, ... */) |
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58 | { |
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59 | // it's possible to add the source through the constructor as well ;) |
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60 | if (func_num_args()) { |
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61 | call_user_func_array(array($this, 'add'), func_get_args()); |
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62 | } |
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63 | } |
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64 | |||
65 | /** |
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66 | * Add a file or straight-up code to be minified. |
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67 | * |
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68 | * @param string|string[] $data |
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69 | * |
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70 | * @return static |
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71 | */ |
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72 | public function add($data /* $data = null, ... */) |
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73 | { |
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74 | // bogus "usage" of parameter $data: scrutinizer warns this variable is |
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75 | // not used (we're using func_get_args instead to support overloading), |
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76 | // but it still needs to be defined because it makes no sense to have |
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77 | // this function without argument :) |
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78 | $args = array($data) + func_get_args(); |
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79 | |||
80 | // this method can be overloaded |
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81 | foreach ($args as $data) { |
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82 | if (is_array($data)) { |
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83 | call_user_func_array(array($this, 'add'), $data); |
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84 | continue; |
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85 | } |
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86 | |||
87 | // redefine var |
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88 | $data = (string) $data; |
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89 | |||
90 | // load data |
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91 | $value = $this->load($data); |
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92 | $key = ($data != $value) ? $data : count($this->data); |
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93 | |||
94 | // replace CR linefeeds etc. |
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95 | // @see https://github.com/matthiasmullie/minify/pull/139 |
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96 | $value = str_replace(array("\r\n", "\r"), "\n", $value); |
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97 | |||
98 | // store data |
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99 | $this->data[$key] = $value; |
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100 | } |
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101 | |||
102 | return $this; |
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103 | } |
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104 | |||
105 | /** |
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106 | * Add a file to be minified. |
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107 | * |
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108 | * @param string|string[] $data |
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109 | * |
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110 | * @return static |
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111 | * |
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112 | * @throws IOException |
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113 | */ |
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114 | public function addFile($data /* $data = null, ... */) |
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115 | { |
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116 | // bogus "usage" of parameter $data: scrutinizer warns this variable is |
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117 | // not used (we're using func_get_args instead to support overloading), |
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118 | // but it still needs to be defined because it makes no sense to have |
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119 | // this function without argument :) |
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120 | $args = array($data) + func_get_args(); |
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121 | |||
122 | // this method can be overloaded |
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123 | foreach ($args as $path) { |
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124 | if (is_array($path)) { |
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125 | call_user_func_array(array($this, 'addFile'), $path); |
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126 | continue; |
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127 | } |
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128 | |||
129 | // redefine var |
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130 | $path = (string) $path; |
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131 | |||
132 | // check if we can read the file |
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133 | if (!$this->canImportFile($path)) { |
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1042 | daniel-mar | 134 | throw new IOException('The file "' . $path . '" could not be opened for reading. Check if PHP has enough permissions.'); |
597 | daniel-mar | 135 | } |
136 | |||
137 | $this->add($path); |
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138 | } |
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139 | |||
140 | return $this; |
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141 | } |
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142 | |||
143 | /** |
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144 | * Minify the data & (optionally) saves it to a file. |
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145 | * |
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146 | * @param string[optional] $path Path to write the data to |
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147 | * |
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148 | * @return string The minified data |
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149 | */ |
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150 | public function minify($path = null) |
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151 | { |
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152 | $content = $this->execute($path); |
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153 | |||
154 | // save to path |
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155 | if ($path !== null) { |
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156 | $this->save($content, $path); |
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157 | } |
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158 | |||
159 | return $content; |
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160 | } |
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161 | |||
162 | /** |
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163 | * Minify & gzip the data & (optionally) saves it to a file. |
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164 | * |
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165 | * @param string[optional] $path Path to write the data to |
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166 | * @param int[optional] $level Compression level, from 0 to 9 |
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167 | * |
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168 | * @return string The minified & gzipped data |
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169 | */ |
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170 | public function gzip($path = null, $level = 9) |
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171 | { |
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172 | $content = $this->execute($path); |
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173 | $content = gzencode($content, $level, FORCE_GZIP); |
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174 | |||
175 | // save to path |
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176 | if ($path !== null) { |
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177 | $this->save($content, $path); |
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178 | } |
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179 | |||
180 | return $content; |
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181 | } |
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182 | |||
183 | /** |
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184 | * Minify the data & write it to a CacheItemInterface object. |
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185 | * |
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186 | * @param CacheItemInterface $item Cache item to write the data to |
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187 | * |
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188 | * @return CacheItemInterface Cache item with the minifier data |
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189 | */ |
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190 | public function cache(CacheItemInterface $item) |
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191 | { |
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192 | $content = $this->execute(); |
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193 | $item->set($content); |
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194 | |||
195 | return $item; |
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196 | } |
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197 | |||
198 | /** |
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199 | * Minify the data. |
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200 | * |
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201 | * @param string[optional] $path Path to write the data to |
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202 | * |
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203 | * @return string The minified data |
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204 | */ |
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205 | abstract public function execute($path = null); |
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206 | |||
207 | /** |
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208 | * Load data. |
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209 | * |
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210 | * @param string $data Either a path to a file or the content itself |
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211 | * |
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212 | * @return string |
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213 | */ |
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214 | protected function load($data) |
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215 | { |
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216 | // check if the data is a file |
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217 | if ($this->canImportFile($data)) { |
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218 | $data = file_get_contents($data); |
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219 | |||
220 | // strip BOM, if any |
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221 | if (substr($data, 0, 3) == "\xef\xbb\xbf") { |
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222 | $data = substr($data, 3); |
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223 | } |
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224 | } |
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225 | |||
226 | return $data; |
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227 | } |
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228 | |||
229 | /** |
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230 | * Save to file. |
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231 | * |
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232 | * @param string $content The minified data |
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233 | * @param string $path The path to save the minified data to |
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234 | * |
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235 | * @throws IOException |
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236 | */ |
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237 | protected function save($content, $path) |
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238 | { |
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239 | $handler = $this->openFileForWriting($path); |
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240 | |||
241 | $this->writeToFile($handler, $content); |
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242 | |||
243 | @fclose($handler); |
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244 | } |
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245 | |||
246 | /** |
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247 | * Register a pattern to execute against the source content. |
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248 | * |
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842 | daniel-mar | 249 | * If $replacement is a string, it must be plain text. Placeholders like $1 or \2 don't work. |
250 | * If you need that functionality, use a callback instead. |
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251 | * |
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597 | daniel-mar | 252 | * @param string $pattern PCRE pattern |
253 | * @param string|callable $replacement Replacement value for matched pattern |
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254 | */ |
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255 | protected function registerPattern($pattern, $replacement = '') |
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256 | { |
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257 | // study the pattern, we'll execute it more than once |
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258 | $pattern .= 'S'; |
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259 | |||
260 | $this->patterns[] = array($pattern, $replacement); |
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261 | } |
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262 | |||
263 | /** |
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264 | * We can't "just" run some regular expressions against JavaScript: it's a |
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265 | * complex language. E.g. having an occurrence of // xyz would be a comment, |
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266 | * unless it's used within a string. Of you could have something that looks |
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267 | * like a 'string', but inside a comment. |
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268 | * The only way to accurately replace these pieces is to traverse the JS one |
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269 | * character at a time and try to find whatever starts first. |
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270 | * |
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271 | * @param string $content The content to replace patterns in |
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272 | * |
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273 | * @return string The (manipulated) content |
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274 | */ |
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275 | protected function replace($content) |
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276 | { |
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842 | daniel-mar | 277 | $contentLength = strlen($content); |
278 | $output = ''; |
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279 | $processedOffset = 0; |
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597 | daniel-mar | 280 | $positions = array_fill(0, count($this->patterns), -1); |
281 | $matches = array(); |
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282 | |||
842 | daniel-mar | 283 | while ($processedOffset < $contentLength) { |
597 | daniel-mar | 284 | // find first match for all patterns |
285 | foreach ($this->patterns as $i => $pattern) { |
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286 | list($pattern, $replacement) = $pattern; |
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287 | |||
288 | // we can safely ignore patterns for positions we've unset earlier, |
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289 | // because we know these won't show up anymore |
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290 | if (array_key_exists($i, $positions) == false) { |
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291 | continue; |
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292 | } |
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293 | |||
294 | // no need to re-run matches that are still in the part of the |
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295 | // content that hasn't been processed |
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842 | daniel-mar | 296 | if ($positions[$i] >= $processedOffset) { |
597 | daniel-mar | 297 | continue; |
298 | } |
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299 | |||
300 | $match = null; |
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842 | daniel-mar | 301 | if (preg_match($pattern, $content, $match, PREG_OFFSET_CAPTURE, $processedOffset)) { |
597 | daniel-mar | 302 | $matches[$i] = $match; |
303 | |||
304 | // we'll store the match position as well; that way, we |
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305 | // don't have to redo all preg_matches after changing only |
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306 | // the first (we'll still know where those others are) |
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307 | $positions[$i] = $match[0][1]; |
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308 | } else { |
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309 | // if the pattern couldn't be matched, there's no point in |
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310 | // executing it again in later runs on this same content; |
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311 | // ignore this one until we reach end of content |
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312 | unset($matches[$i], $positions[$i]); |
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313 | } |
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314 | } |
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315 | |||
316 | // no more matches to find: everything's been processed, break out |
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317 | if (!$matches) { |
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842 | daniel-mar | 318 | // output the remaining content |
319 | $output .= substr($content, $processedOffset); |
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597 | daniel-mar | 320 | break; |
321 | } |
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322 | |||
323 | // see which of the patterns actually found the first thing (we'll |
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324 | // only want to execute that one, since we're unsure if what the |
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325 | // other found was not inside what the first found) |
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842 | daniel-mar | 326 | $matchOffset = min($positions); |
327 | $firstPattern = array_search($matchOffset, $positions); |
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328 | $match = $matches[$firstPattern]; |
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597 | daniel-mar | 329 | |
330 | // execute the pattern that matches earliest in the content string |
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842 | daniel-mar | 331 | list(, $replacement) = $this->patterns[$firstPattern]; |
597 | daniel-mar | 332 | |
842 | daniel-mar | 333 | // add the part of the input between $processedOffset and the first match; |
334 | // that content wasn't matched by anything |
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335 | $output .= substr($content, $processedOffset, $matchOffset - $processedOffset); |
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336 | // add the replacement for the match |
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337 | $output .= $this->executeReplacement($replacement, $match); |
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338 | // advance $processedOffset past the match |
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339 | $processedOffset = $matchOffset + strlen($match[0][0]); |
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597 | daniel-mar | 340 | } |
341 | |||
842 | daniel-mar | 342 | return $output; |
597 | daniel-mar | 343 | } |
344 | |||
345 | /** |
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842 | daniel-mar | 346 | * If $replacement is a callback, execute it, passing in the match data. |
347 | * If it's a string, just pass it through. |
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597 | daniel-mar | 348 | * |
349 | * @param string|callable $replacement Replacement value |
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842 | daniel-mar | 350 | * @param array $match Match data, in PREG_OFFSET_CAPTURE form |
597 | daniel-mar | 351 | * |
352 | * @return string |
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353 | */ |
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842 | daniel-mar | 354 | protected function executeReplacement($replacement, $match) |
597 | daniel-mar | 355 | { |
842 | daniel-mar | 356 | if (!is_callable($replacement)) { |
357 | return $replacement; |
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597 | daniel-mar | 358 | } |
842 | daniel-mar | 359 | // convert $match from the PREG_OFFSET_CAPTURE form to the form the callback expects |
360 | foreach ($match as &$matchItem) { |
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361 | $matchItem = $matchItem[0]; |
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362 | } |
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1042 | daniel-mar | 363 | |
842 | daniel-mar | 364 | return $replacement($match); |
597 | daniel-mar | 365 | } |
366 | |||
367 | /** |
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368 | * Strings are a pattern we need to match, in order to ignore potential |
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369 | * code-like content inside them, but we just want all of the string |
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370 | * content to remain untouched. |
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371 | * |
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372 | * This method will replace all string content with simple STRING# |
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373 | * placeholder text, so we've rid all strings from characters that may be |
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374 | * misinterpreted. Original string content will be saved in $this->extracted |
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375 | * and after doing all other minifying, we can restore the original content |
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376 | * via restoreStrings(). |
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377 | * |
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378 | * @param string[optional] $chars |
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379 | * @param string[optional] $placeholderPrefix |
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380 | */ |
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381 | protected function extractStrings($chars = '\'"', $placeholderPrefix = '') |
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382 | { |
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383 | // PHP only supports $this inside anonymous functions since 5.4 |
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384 | $minifier = $this; |
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385 | $callback = function ($match) use ($minifier, $placeholderPrefix) { |
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386 | // check the second index here, because the first always contains a quote |
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387 | if ($match[2] === '') { |
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388 | /* |
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389 | * Empty strings need no placeholder; they can't be confused for |
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390 | * anything else anyway. |
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391 | * But we still needed to match them, for the extraction routine |
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392 | * to skip over this particular string. |
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393 | */ |
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394 | return $match[0]; |
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395 | } |
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396 | |||
397 | $count = count($minifier->extracted); |
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1042 | daniel-mar | 398 | $placeholder = $match[1] . $placeholderPrefix . $count . $match[1]; |
399 | $minifier->extracted[$placeholder] = $match[1] . $match[2] . $match[1]; |
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597 | daniel-mar | 400 | |
401 | return $placeholder; |
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402 | }; |
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403 | |||
404 | /* |
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405 | * The \\ messiness explained: |
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406 | * * Don't count ' or " as end-of-string if it's escaped (has backslash |
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407 | * in front of it) |
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408 | * * Unless... that backslash itself is escaped (another leading slash), |
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409 | * in which case it's no longer escaping the ' or " |
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410 | * * So there can be either no backslash, or an even number |
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411 | * * multiply all of that times 4, to account for the escaping that has |
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412 | * to be done to pass the backslash into the PHP string without it being |
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413 | * considered as escape-char (times 2) and to get it in the regex, |
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414 | * escaped (times 2) |
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415 | */ |
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1042 | daniel-mar | 416 | $this->registerPattern('/([' . $chars . '])(.*?(?<!\\\\)(\\\\\\\\)*+)\\1/s', $callback); |
597 | daniel-mar | 417 | } |
418 | |||
419 | /** |
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420 | * This method will restore all extracted data (strings, regexes) that were |
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421 | * replaced with placeholder text in extract*(). The original content was |
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422 | * saved in $this->extracted. |
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423 | * |
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424 | * @param string $content |
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425 | * |
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426 | * @return string |
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427 | */ |
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428 | protected function restoreExtractedData($content) |
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429 | { |
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430 | if (!$this->extracted) { |
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431 | // nothing was extracted, nothing to restore |
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432 | return $content; |
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433 | } |
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434 | |||
435 | $content = strtr($content, $this->extracted); |
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436 | |||
437 | $this->extracted = array(); |
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438 | |||
439 | return $content; |
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440 | } |
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441 | |||
442 | /** |
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443 | * Check if the path is a regular file and can be read. |
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444 | * |
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445 | * @param string $path |
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446 | * |
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447 | * @return bool |
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448 | */ |
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449 | protected function canImportFile($path) |
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450 | { |
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451 | $parsed = parse_url($path); |
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452 | if ( |
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453 | // file is elsewhere |
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454 | isset($parsed['host']) || |
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455 | // file responds to queries (may change, or need to bypass cache) |
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456 | isset($parsed['query']) |
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457 | ) { |
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458 | return false; |
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459 | } |
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460 | |||
461 | return strlen($path) < PHP_MAXPATHLEN && @is_file($path) && is_readable($path); |
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462 | } |
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463 | |||
464 | /** |
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465 | * Attempts to open file specified by $path for writing. |
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466 | * |
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467 | * @param string $path The path to the file |
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468 | * |
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469 | * @return resource Specifier for the target file |
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470 | * |
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471 | * @throws IOException |
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472 | */ |
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473 | protected function openFileForWriting($path) |
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474 | { |
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475 | if ($path === '' || ($handler = @fopen($path, 'w')) === false) { |
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1042 | daniel-mar | 476 | throw new IOException('The file "' . $path . '" could not be opened for writing. Check if PHP has enough permissions.'); |
597 | daniel-mar | 477 | } |
478 | |||
479 | return $handler; |
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480 | } |
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481 | |||
482 | /** |
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483 | * Attempts to write $content to the file specified by $handler. $path is used for printing exceptions. |
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484 | * |
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485 | * @param resource $handler The resource to write to |
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486 | * @param string $content The content to write |
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487 | * @param string $path The path to the file (for exception printing only) |
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488 | * |
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489 | * @throws IOException |
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490 | */ |
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491 | protected function writeToFile($handler, $content, $path = '') |
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492 | { |
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493 | if ( |
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494 | !is_resource($handler) || |
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495 | ($result = @fwrite($handler, $content)) === false || |
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496 | ($result < strlen($content)) |
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497 | ) { |
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1042 | daniel-mar | 498 | throw new IOException('The file "' . $path . '" could not be written to. Check your disk space and file permissions.'); |
597 | daniel-mar | 499 | } |
500 | } |
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925 | daniel-mar | 501 | |
1042 | daniel-mar | 502 | protected static function str_replace_first($search, $replace, $subject) |
503 | { |
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925 | daniel-mar | 504 | $pos = strpos($subject, $search); |
505 | if ($pos !== false) { |
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506 | return substr_replace($subject, $replace, $pos, strlen($search)); |
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507 | } |
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1042 | daniel-mar | 508 | |
925 | daniel-mar | 509 | return $subject; |
510 | } |
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597 | daniel-mar | 511 | } |