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| 1 | <?php |
| 2 | /** |
| 3 | * Source map generator |
| 4 | * |
| 5 | * @private |
| 6 | */ |
| 7 | class Less_SourceMap_Generator extends Less_Configurable { |
| 8 | |
| 9 | /** |
| 10 | * What version of source map does the generator generate? |
| 11 | */ |
| 12 | private const VERSION = 3; |
| 13 | |
| 14 | /** |
| 15 | * Array of default options |
| 16 | * |
| 17 | * @var array |
| 18 | */ |
| 19 | protected $defaultOptions = [ |
| 20 | // an optional source root, useful for relocating source files |
| 21 | // on a server or removing repeated values in the 'sources' entry. |
| 22 | // This value is prepended to the individual entries in the 'source' field. |
| 23 | 'sourceRoot' => '', |
| 24 | |
| 25 | // an optional name of the generated code that this source map is associated with. |
| 26 | 'sourceMapFilename' => null, |
| 27 | |
| 28 | // url of the map |
| 29 | 'sourceMapURL' => null, |
| 30 | |
| 31 | // absolute path to a file to write the map to |
| 32 | 'sourceMapWriteTo' => null, |
| 33 | |
| 34 | // output source contents? |
| 35 | 'outputSourceFiles' => false, |
| 36 | |
| 37 | // base path for filename normalization |
| 38 | 'sourceMapRootpath' => '', |
| 39 | |
| 40 | // base path for filename normalization |
| 41 | 'sourceMapBasepath' => '' |
| 42 | ]; |
| 43 | |
| 44 | /** |
| 45 | * The base64 VLQ encoder |
| 46 | * |
| 47 | * @var Less_SourceMap_Base64VLQ |
| 48 | */ |
| 49 | protected $encoder; |
| 50 | |
| 51 | /** |
| 52 | * Array of mappings |
| 53 | * |
| 54 | * @var array |
| 55 | */ |
| 56 | protected $mappings = []; |
| 57 | |
| 58 | /** |
| 59 | * The root node |
| 60 | * |
| 61 | * @var Less_Tree_Ruleset |
| 62 | */ |
| 63 | protected $root; |
| 64 | |
| 65 | /** |
| 66 | * Array of contents map |
| 67 | * |
| 68 | * @var array |
| 69 | */ |
| 70 | protected $contentsMap = []; |
| 71 | |
| 72 | /** |
| 73 | * File to content map |
| 74 | * |
| 75 | * @var array<string,string> |
| 76 | */ |
| 77 | protected $sources = []; |
| 78 | /** @var array<string,int> */ |
| 79 | protected $source_keys = []; |
| 80 | |
| 81 | /** |
| 82 | * Constructor |
| 83 | * |
| 84 | * @param Less_Tree_Ruleset $root The root node |
| 85 | * @param array $contentsMap |
| 86 | * @param array $options Array of options |
| 87 | */ |
| 88 | public function __construct( Less_Tree_Ruleset $root, $contentsMap, $options = [] ) { |
| 89 | $this->root = $root; |
| 90 | $this->contentsMap = $contentsMap; |
| 91 | $this->encoder = new Less_SourceMap_Base64VLQ(); |
| 92 | |
| 93 | $this->SetOptions( $options ); |
| 94 | |
| 95 | $this->options['sourceMapRootpath'] = $this->fixWindowsPath( $this->options['sourceMapRootpath'], true ); |
| 96 | $this->options['sourceMapBasepath'] = $this->fixWindowsPath( $this->options['sourceMapBasepath'], true ); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * PHP version of JavaScript's `encodeURIComponent` function |
| 101 | * |
| 102 | * @param string $string The string to encode |
| 103 | * @return string The encoded string |
| 104 | */ |
| 105 | private static function encodeURIComponent( $string ) { |
| 106 | $revert = [ '%21' => '!', '%2A' => '*', '%27' => "'", '%28' => '(', '%29' => ')' ]; |
| 107 | return strtr( rawurlencode( $string ), $revert ); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Generates the CSS |
| 112 | * |
| 113 | * @return string |
| 114 | */ |
| 115 | public function generateCSS() { |
| 116 | $output = new Less_Output_Mapped( $this->contentsMap, $this ); |
| 117 | |
| 118 | // catch the output |
| 119 | $this->root->genCSS( $output ); |
| 120 | |
| 121 | $sourceMapUrl = $this->getOption( 'sourceMapURL' ); |
| 122 | $sourceMapFilename = $this->getOption( 'sourceMapFilename' ); |
| 123 | $sourceMapContent = $this->generateJson(); |
| 124 | $sourceMapWriteTo = $this->getOption( 'sourceMapWriteTo' ); |
| 125 | |
| 126 | if ( !$sourceMapUrl && $sourceMapFilename ) { |
| 127 | $sourceMapUrl = $this->normalizeFilename( $sourceMapFilename ); |
| 128 | } |
| 129 | |
| 130 | // write map to a file |
| 131 | if ( $sourceMapWriteTo ) { |
| 132 | $this->saveMap( $sourceMapWriteTo, $sourceMapContent ); |
| 133 | } |
| 134 | |
| 135 | // inline the map |
| 136 | if ( !$sourceMapUrl ) { |
| 137 | $sourceMapUrl = sprintf( 'data:application/json,%s', self::encodeURIComponent( $sourceMapContent ) ); |
| 138 | } |
| 139 | |
| 140 | if ( $sourceMapUrl ) { |
| 141 | $output->add( sprintf( '/*# sourceMappingURL=%s */', $sourceMapUrl ) ); |
| 142 | } |
| 143 | |
| 144 | return $output->toString(); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Saves the source map to a file |
| 149 | * |
| 150 | * @param string $file The absolute path to a file |
| 151 | * @param string $content The content to write |
| 152 | * @throws Exception If the file could not be saved |
| 153 | */ |
| 154 | protected function saveMap( $file, $content ) { |
| 155 | $dir = dirname( $file ); |
| 156 | // directory does not exist |
| 157 | if ( !is_dir( $dir ) ) { |
| 158 | // FIXME: create the dir automatically? |
| 159 | throw new Exception( sprintf( 'The directory "%s" does not exist. Cannot save the source map.', $dir ) ); |
| 160 | } |
| 161 | // FIXME: proper saving, with dir write check! |
| 162 | if ( file_put_contents( $file, $content ) === false ) { |
| 163 | throw new Exception( sprintf( 'Cannot save the source map to "%s"', $file ) ); |
| 164 | } |
| 165 | return true; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Normalizes the filename |
| 170 | * |
| 171 | * @param string $filename |
| 172 | * @return string |
| 173 | */ |
| 174 | protected function normalizeFilename( $filename ) { |
| 175 | $filename = $this->fixWindowsPath( $filename ); |
| 176 | |
| 177 | $rootpath = $this->getOption( 'sourceMapRootpath' ); |
| 178 | $basePath = $this->getOption( 'sourceMapBasepath' ); |
| 179 | |
| 180 | // "Trim" the 'sourceMapBasepath' from the output filename. |
| 181 | if ( is_string( $basePath ) && strpos( $filename, $basePath ) === 0 ) { |
| 182 | $filename = substr( $filename, strlen( $basePath ) ); |
| 183 | } |
| 184 | |
| 185 | // Remove extra leading path separators. |
| 186 | if ( strpos( $filename, '\\' ) === 0 || strpos( $filename, '/' ) === 0 ) { |
| 187 | $filename = substr( $filename, 1 ); |
| 188 | } |
| 189 | |
| 190 | return $rootpath . $filename; |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Adds a mapping |
| 195 | * |
| 196 | * @param int $generatedLine The line number in generated file |
| 197 | * @param int $generatedColumn The column number in generated file |
| 198 | * @param int $originalLine The line number in original file |
| 199 | * @param int $originalColumn The column number in original file |
| 200 | * @param array $fileInfo The original source file |
| 201 | */ |
| 202 | public function addMapping( $generatedLine, $generatedColumn, $originalLine, $originalColumn, $fileInfo ) { |
| 203 | $this->mappings[] = [ |
| 204 | 'generated_line' => $generatedLine, |
| 205 | 'generated_column' => $generatedColumn, |
| 206 | 'original_line' => $originalLine, |
| 207 | 'original_column' => $originalColumn, |
| 208 | 'source_file' => $fileInfo['currentUri'] ?? null |
| 209 | ]; |
| 210 | |
| 211 | if ( isset( $fileInfo['currentUri'] ) ) { |
| 212 | $this->sources[$fileInfo['currentUri']] = $fileInfo['filename']; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * Generates the JSON source map |
| 218 | * |
| 219 | * @return string |
| 220 | * @see https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit# |
| 221 | */ |
| 222 | protected function generateJson() { |
| 223 | $sourceMap = []; |
| 224 | $mappings = $this->generateMappings(); |
| 225 | |
| 226 | // File version (always the first entry in the object) and must be a positive integer. |
| 227 | $sourceMap['version'] = self::VERSION; |
| 228 | |
| 229 | // An optional name of the generated code that this source map is associated with. |
| 230 | $file = $this->getOption( 'sourceMapFilename' ); |
| 231 | if ( $file ) { |
| 232 | $sourceMap['file'] = $file; |
| 233 | } |
| 234 | |
| 235 | // An optional source root, useful for relocating source files on a server or removing repeated values in the 'sources' entry. |
| 236 | // This value is prepended to the individual entries in the 'source' field. |
| 237 | $root = $this->getOption( 'sourceRoot' ); |
| 238 | if ( $root ) { |
| 239 | $sourceMap['sourceRoot'] = $root; |
| 240 | } |
| 241 | |
| 242 | // A list of original sources used by the 'mappings' entry. |
| 243 | $sourceMap['sources'] = []; |
| 244 | foreach ( $this->sources as $source_uri => $source_filename ) { |
| 245 | $sourceMap['sources'][] = $this->normalizeFilename( $source_filename ); |
| 246 | } |
| 247 | |
| 248 | // A list of symbol names used by the 'mappings' entry. |
| 249 | $sourceMap['names'] = []; |
| 250 | |
| 251 | // A string with the encoded mapping data. |
| 252 | $sourceMap['mappings'] = $mappings; |
| 253 | |
| 254 | if ( $this->getOption( 'outputSourceFiles' ) ) { |
| 255 | // An optional list of source content, useful when the 'source' can't be hosted. |
| 256 | // The contents are listed in the same order as the sources above. |
| 257 | // 'null' may be used if some original sources should be retrieved by name. |
| 258 | $sourceMap['sourcesContent'] = $this->getSourcesContent(); |
| 259 | } |
| 260 | |
| 261 | // less.js compat fixes |
| 262 | if ( count( $sourceMap['sources'] ) && empty( $sourceMap['sourceRoot'] ) ) { |
| 263 | unset( $sourceMap['sourceRoot'] ); |
| 264 | } |
| 265 | |
| 266 | return json_encode( $sourceMap ); |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * Returns the sources contents |
| 271 | * |
| 272 | * @return array|null |
| 273 | */ |
| 274 | protected function getSourcesContent() { |
| 275 | if ( empty( $this->sources ) ) { |
| 276 | return; |
| 277 | } |
| 278 | $content = []; |
| 279 | foreach ( $this->sources as $sourceFile ) { |
| 280 | $content[] = file_get_contents( $sourceFile ); |
| 281 | } |
| 282 | return $content; |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * Generates the mappings string |
| 287 | * |
| 288 | * @return string |
| 289 | */ |
| 290 | public function generateMappings() { |
| 291 | if ( !count( $this->mappings ) ) { |
| 292 | return ''; |
| 293 | } |
| 294 | |
| 295 | $this->source_keys = array_flip( array_keys( $this->sources ) ); |
| 296 | |
| 297 | // group mappings by generated line number. |
| 298 | $groupedMap = $groupedMapEncoded = []; |
| 299 | foreach ( $this->mappings as $m ) { |
| 300 | $groupedMap[$m['generated_line']][] = $m; |
| 301 | } |
| 302 | ksort( $groupedMap ); |
| 303 | |
| 304 | $lastGeneratedLine = $lastOriginalIndex = $lastOriginalLine = $lastOriginalColumn = 0; |
| 305 | |
| 306 | foreach ( $groupedMap as $lineNumber => $line_map ) { |
| 307 | while ( ++$lastGeneratedLine < $lineNumber ) { |
| 308 | $groupedMapEncoded[] = ';'; |
| 309 | } |
| 310 | |
| 311 | $lineMapEncoded = []; |
| 312 | $lastGeneratedColumn = 0; |
| 313 | |
| 314 | foreach ( $line_map as $m ) { |
| 315 | $mapEncoded = $this->encoder->encode( $m['generated_column'] - $lastGeneratedColumn ); |
| 316 | $lastGeneratedColumn = $m['generated_column']; |
| 317 | |
| 318 | // find the index |
| 319 | if ( $m['source_file'] ) { |
| 320 | $index = $this->findFileIndex( $m['source_file'] ); |
| 321 | if ( $index !== false ) { |
| 322 | $mapEncoded .= $this->encoder->encode( $index - $lastOriginalIndex ); |
| 323 | $lastOriginalIndex = $index; |
| 324 | |
| 325 | // lines are stored 0-based in SourceMap spec version 3 |
| 326 | $mapEncoded .= $this->encoder->encode( $m['original_line'] - 1 - $lastOriginalLine ); |
| 327 | $lastOriginalLine = $m['original_line'] - 1; |
| 328 | |
| 329 | $mapEncoded .= $this->encoder->encode( $m['original_column'] - $lastOriginalColumn ); |
| 330 | $lastOriginalColumn = $m['original_column']; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | $lineMapEncoded[] = $mapEncoded; |
| 335 | } |
| 336 | |
| 337 | $groupedMapEncoded[] = implode( ',', $lineMapEncoded ) . ';'; |
| 338 | } |
| 339 | |
| 340 | return rtrim( implode( $groupedMapEncoded ), ';' ); |
| 341 | } |
| 342 | |
| 343 | /** |
| 344 | * Finds the index for the filename |
| 345 | * |
| 346 | * @param string $filename |
| 347 | * @return int|false |
| 348 | */ |
| 349 | protected function findFileIndex( $filename ) { |
| 350 | return $this->source_keys[$filename] ?? false; |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * fix windows paths |
| 355 | * @param string $path |
| 356 | * @param bool $addEndSlash |
| 357 | * @return string |
| 358 | */ |
| 359 | public function fixWindowsPath( $path, $addEndSlash = false ) { |
| 360 | $slash = ( $addEndSlash ) ? '/' : ''; |
| 361 | if ( !empty( $path ) ) { |
| 362 | $path = str_replace( '\\', '/', $path ); |
| 363 | $path = rtrim( $path, '/' ) . $slash; |
| 364 | } |
| 365 | |
| 366 | return $path; |
| 367 | } |
| 368 | |
| 369 | } |