includes/utils/AutoloadGenerator.php

   1 <?php
   2
   3 /**
   4  * Accepts a list of files and directories to search for
   5  * php files and generates $wgAutoloadLocalClasses or $wgAutoloadClasses
   6  * lines for all detected classes. These lines are written out
   7  * to an autoload.php file in the projects provided basedir.
   8  *
   9  * Usage:
  10  *
  11  *     $gen = new AutoloadGenerator( __DIR__ );
  12  *     $gen->readDir( __DIR__ . '/includes' );
  13  *     $gen->readFile( __DIR__ . '/foo.php' )
  14  *     $gen->generateAutoload();
  15  */
  16 class AutoloadGenerator {
  17         /**
  18          * @var string Root path of the project being scanned for classes
  19          */
  20         protected $basepath;
  21
  22         /**
  23          * @var ClassCollector Helper class extracts class names from php files
  24          */
  25         protected $collector;
  26
  27         /**
  28          * @var array Map of file shortpath to list of FQCN detected within file
  29          */
  30         protected $classes = array();
  31
  32         /**
  33          * @var string The global variable to write output to
  34          */
  35         protected $variableName = 'wgAutoloadClasses';
  36
  37         /**
  38          * @var array Map of FQCN to relative path(from self::$basepath)
  39          */
  40         protected $overrides = array();
  41
  42         /**
  43          * @param string $basepath Root path of the project being scanned for classes
  44          * @param array|string $flags
  45          *
  46          *  local - If this flag is set $wgAutoloadLocalClasses will be build instead
  47          *          of $wgAutoloadClasses
  48          */
  49         public function __construct( $basepath, $flags = array() ) {
  50                 if ( !is_array( $flags ) ) {
  51                         $flags = array( $flags );
  52                 }
  53                 $this->basepath = self::normalizePathSeparator( realpath( $basepath ) );
  54                 $this->collector = new ClassCollector;
  55                 if ( in_array( 'local', $flags ) ) {
  56                         $this->variableName = 'wgAutoloadLocalClasses';
  57                 }
  58         }
  59
  60         /**
  61          * Force a class to be autoloaded from a specific path, regardless of where
  62          * or if it was detected.
  63          *
  64          * @param string $fqcn FQCN to force the location of
  65          * @param string $inputPath Full path to the file containing the class
  66          * @throws Exception
  67          */
  68         public function forceClassPath( $fqcn, $inputPath ) {
  69                 $path = self::normalizePathSeparator( realpath( $inputPath ) );
  70                 if ( !$path ) {
  71                         throw new \Exception( "Invalid path: $inputPath" );
  72                 }
  73                 $len = strlen( $this->basepath );
  74                 if ( substr( $path, 0, $len ) !== $this->basepath ) {
  75                         throw new \Exception( "Path is not within basepath: $inputPath" );
  76                 }
  77                 $shortpath = substr( $path, $len );
  78                 $this->overrides[$fqcn] = $shortpath;
  79         }
  80
  81         /**
  82          * @param string $inputPath Path to a php file to find classes within
  83          * @throws Exception
  84          */
  85         public function readFile( $inputPath ) {
  86                 // NOTE: do NOT expand $inputPath using realpath(). It is perfectly
  87                 // reasonable for LocalSettings.php and similiar files to be symlinks
  88                 // to files that are outside of $this->basepath.
  89                 $inputPath = self::normalizePathSeparator( $inputPath );
  90                 $len = strlen( $this->basepath );
  91                 if ( substr( $inputPath, 0, $len ) !== $this->basepath ) {
  92                         throw new \Exception( "Path is not within basepath: $inputPath" );
  93                 }
  94                 $result = $this->collector->getClasses(
  95                         file_get_contents( $inputPath )
  96                 );
  97                 if ( $result ) {
  98                         $shortpath = substr( $inputPath, $len );
  99                         $this->classes[$shortpath] = $result;
 100                 }
 101         }
 102
 103         /**
 104          * @param string $dir Path to a directory to recursively search
 105          *  for php files with either .php or .inc extensions
 106          */
 107         public function readDir( $dir ) {
 108                 $it = new RecursiveDirectoryIterator(
 109                         self::normalizePathSeparator( realpath( $dir ) ) );
 110                 $it = new RecursiveIteratorIterator( $it );
 111
 112                 foreach ( $it as $path => $file ) {
 113                         $ext = pathinfo( $path, PATHINFO_EXTENSION );
 114                         // some older files in mw use .inc
 115                         if ( $ext === 'php' || $ext === 'inc' ) {
 116                                 $this->readFile( $path );
 117                         }
 118                 }
 119         }
 120
 121         /**
 122          * Write out all known classes to autoload.php in
 123          * the provided basedir
 124          *
 125          * @param string $commandName Value used in file comment to direct
 126          *  developers towards the appropriate way to update the autoload.
 127          */
 128         public function generateAutoload( $commandName = 'AutoloadGenerator' ) {
 129                 $content = array();
 130
 131                 // We need to generate a line each rather than exporting the
 132                 // full array so __DIR__ can be prepended to all the paths
 133                 $format = "%s => __DIR__ . %s,";
 134                 foreach ( $this->classes as $path => $contained ) {
 135                         $exportedPath = var_export( $path, true );
 136                         foreach ( $contained as $fqcn ) {
 137                                 $content[$fqcn] = sprintf(
 138                                         $format,
 139                                         var_export( $fqcn, true ),
 140                                         $exportedPath
 141                                 );
 142                         }
 143                 }
 144
 145                 foreach ( $this->overrides as $fqcn => $path ) {
 146                         $content[$fqcn] = sprintf(
 147                                 $format,
 148                                 var_export( $fqcn, true ),
 149                                 var_export( $path, true )
 150                         );
 151                 }
 152
 153                 // sort for stable output
 154                 ksort( $content );
 155
 156                 // extensions using this generator are appending to the existing
 157                 // autoload.
 158                 if ( $this->variableName === 'wgAutoloadClasses' ) {
 159                         $op = '+=';
 160                 } else {
 161                         $op = '=';
 162                 }
 163
 164                 $output = implode( "\n\t", $content );
 165                 file_put_contents(
 166                         $this->basepath . '/autoload.php',
 167                         <<<EOD
 168 <?php
 169 // This file is generated by $commandName, do not adjust manually
 170
 171 global \${$this->variableName};
 172
 173 \${$this->variableName} {$op} array(
 174         {$output}
 175 );
 176
 177 EOD
 178                 );
 179         }
 180
 181         /**
 182          * Ensure that Unix-style path separators ("/") are used in the path.
 183          *
 184          * @param string $path
 185          * @return string
 186          */
 187         protected static function normalizePathSeparator( $path ) {
 188                 return str_replace( '\\', '/', $path );
 189         }
 190 }
 191
 192 /**
 193  * Reads PHP code and returns the FQCN of every class defined within it.
 194  */
 195 class ClassCollector {
 196
 197         /**
 198          * @var string Current namespace
 199          */
 200         protected $namespace = '';
 201
 202         /**
 203          * @var array List of FQCN detected in this pass
 204          */
 205         protected $classes;
 206
 207         /**
 208          * @var array Token from token_get_all() that started an expect sequence
 209          */
 210         protected $startToken;
 211
 212         /**
 213          * @var array List of tokens that are members of the current expect sequence
 214          */
 215         protected $tokens;
 216
 217         /**
 218          * @var string $code PHP code (including <?php) to detect class names from
 219          * @return array List of FQCN detected within the tokens
 220          */
 221         public function getClasses( $code ) {
 222                 $this->namespace = '';
 223                 $this->classes = array();
 224                 $this->startToken = null;
 225                 $this->tokens = array();
 226
 227                 foreach ( token_get_all( $code ) as $token ) {
 228                         if ( $this->startToken === null ) {
 229                                 $this->tryBeginExpect( $token );
 230                         } else {
 231                                 $this->tryEndExpect( $token );
 232                         }
 233                 }
 234
 235                 return $this->classes;
 236         }
 237
 238         /**
 239          * Determine if $token begins the next expect sequence.
 240          *
 241          * @param array $token
 242          */
 243         protected function tryBeginExpect( $token ) {
 244                 if ( is_string( $token ) ) {
 245                         return;
 246                 }
 247                 switch ( $token[0] ) {
 248                 case T_NAMESPACE:
 249                 case T_CLASS:
 250                 case T_INTERFACE:
 251                         $this->startToken = $token;
 252                 }
 253         }
 254
 255         /**
 256          * Accepts the next token in an expect sequence
 257          *
 258          * @param array
 259          */
 260         protected function tryEndExpect( $token ) {
 261                 switch ( $this->startToken[0] ) {
 262                 case T_NAMESPACE:
 263                         if ( $token === ';' || $token === '{' ) {
 264                                 $this->namespace = $this->implodeTokens() . '\\';
 265                         } else {
 266                                 $this->tokens[] = $token;
 267                         }
 268                         break;
 269
 270                 case T_CLASS:
 271                 case T_INTERFACE:
 272                         $this->tokens[] = $token;
 273                         if ( is_array( $token ) && $token[0] === T_STRING ) {
 274                                 $this->classes[] = $this->namespace . $this->implodeTokens();
 275                         }
 276                 }
 277         }
 278
 279         /**
 280          * Returns the string representation of the tokens within the
 281          * current expect sequence and resets the sequence.
 282          *
 283          * @return string
 284          */
 285         protected function implodeTokens() {
 286                 $content = array();
 287                 foreach ( $this->tokens as $token ) {
 288                         $content[] = is_string( $token ) ? $token : $token[1];
 289                 }
 290
 291                 $this->tokens = array();
 292                 $this->startToken = null;
 293
 294                 return trim( implode( '', $content ), " \n\t" );
 295         }
 296 }