checkSyntax.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class CheckSyntax extends Maintenance {

    // List of files we're going to check
    private $mFiles = array(), $mFailures = array(), $mWarnings = array();
    private $mIgnorePaths = array(), $mNoStyleCheckPaths = array();

    public function __construct() {
        parent::__construct();
        $this->mDescription = "Check syntax for all PHP files in MediaWiki";
        $this->addOption( 'with-extensions', 'Also recurse the extensions folder' );
        $this->addOption(
            'path',
            'Specific path (file or directory) to check, either with absolute path or '
                . 'relative to the root of this MediaWiki installation',
            false,
            true
        );
        $this->addOption(
            'list-file',
            'Text file containing list of files or directories to check',
            false,
            true
        );
        $this->addOption(
            'modified',
            'Check only files that were modified (requires Git command-line client)'
        );
        $this->addOption( 'syntax-only', 'Check for syntax validity only, skip code style warnings' );
    }

    public function getDbType() {
        return Maintenance::DB_NONE;
    }

    public function execute() {
        $this->buildFileList();

        // ParseKit is broken on PHP 5.3+, disabled until this is fixed
        $useParseKit = function_exists( 'parsekit_compile_file' )
            && version_compare( PHP_VERSION, '5.3', '<' );

        $str = 'Checking syntax (using ' . ( $useParseKit ?
            'parsekit' : ' php -l, this can take a long time' ) . ")\n";
        $this->output( $str );
        foreach ( $this->mFiles as $f ) {
            if ( $useParseKit ) {
                $this->checkFileWithParsekit( $f );
            } else {
                $this->checkFileWithCli( $f );
            }
            if ( !$this->hasOption( 'syntax-only' ) ) {
                $this->checkForMistakes( $f );
            }
        }
        $this->output( "\nDone! " . count( $this->mFiles ) . " files checked, " .
            count( $this->mFailures ) . " failures and " . count( $this->mWarnings ) .
            " warnings found\n" );
    }

    private function buildFileList() {
        global $IP;

        $this->mIgnorePaths = array(
            // Compat stuff, explodes on PHP 5.3
            "includes/NamespaceCompat.php$",
        );

        $this->mNoStyleCheckPaths = array(
            // Third-party code we don't care about
            "/activemq_stomp/",
            "EmailPage/PHPMailer",
            "FCKeditor/fckeditor/",
            '\bphplot-',
            "/svggraph/",
            "\bjsmin.php$",
            "PEAR/File_Ogg/",
            "QPoll/Excel/",
            "/geshi/",
            "/smarty/",
        );

        if ( $this->hasOption( 'path' ) ) {
            $path = $this->getOption( 'path' );
            if ( !$this->addPath( $path ) ) {
                $this->error( "Error: can't find file or directory $path\n", true );
            }

            return; // process only this path
        } elseif ( $this->hasOption( 'list-file' ) ) {
            $file = $this->getOption( 'list-file' );
            wfSuppressWarnings();
            $f = fopen( $file, 'r' );
            wfRestoreWarnings();
            if ( !$f ) {
                $this->error( "Can't open file $file\n", true );
            }
            $path = trim( fgets( $f ) );
            while ( $path ) {
                $this->addPath( $path );
            }
            fclose( $f );

            return;
        } elseif ( $this->hasOption( 'modified' ) ) {
            $this->output( "Retrieving list from Git... " );
            $files = $this->getGitModifiedFiles( $IP );
            $this->output( "done\n" );
            foreach ( $files as $file ) {
                if ( $this->isSuitableFile( $file ) && !is_dir( $file ) ) {
                    $this->mFiles[] = $file;
                }
            }

            return;
        }

        $this->output( 'Building file list...', 'listfiles' );

        // Only check files in these directories.
        // Don't just put $IP, because the recursive dir thingie goes into all subdirs
        $dirs = array(
            $IP . '/includes',
            $IP . '/mw-config',
            $IP . '/languages',
            $IP . '/maintenance',
            $IP . '/skins',
        );
        if ( $this->hasOption( 'with-extensions' ) ) {
            $dirs[] = $IP . '/extensions';
        }

        foreach ( $dirs as $d ) {
            $this->addDirectoryContent( $d );
        }

        // Manually add two user-editable files that are usually sources of problems
        if ( file_exists( "$IP/LocalSettings.php" ) ) {
            $this->mFiles[] = "$IP/LocalSettings.php";
        }

        $this->output( 'done.', 'listfiles' );
    }

    private function getGitModifiedFiles( $path ) {

        global $wgMaxShellMemory;

        if ( !is_dir( "$path/.git" ) ) {
            $this->error( "Error: Not a Git repository!\n", true );
        }

        // git diff eats memory.
        $oldMaxShellMemory = $wgMaxShellMemory;
        if ( $wgMaxShellMemory < 1024000 ) {
            $wgMaxShellMemory = 1024000;
        }

        $ePath = wfEscapeShellArg( $path );

        // Find an ancestor in common with master (rather than just using its HEAD)
        // to prevent files only modified there from showing up in the list.
        $cmd = "cd $ePath && git merge-base master HEAD";
        $retval = 0;
        $output = wfShellExec( $cmd, $retval );
        if ( $retval !== 0 ) {
            $this->error( "Error retrieving base SHA1 from Git!\n", true );
        }

        // Find files in the working tree that changed since then.
        $eBase = wfEscapeShellArg( rtrim( $output, "\n" ) );
        $cmd = "cd $ePath && git diff --name-only --diff-filter AM $eBase";
        $retval = 0;
        $output = wfShellExec( $cmd, $retval );
        if ( $retval !== 0 ) {
            $this->error( "Error retrieving list from Git!\n", true );
        }

        $wgMaxShellMemory = $oldMaxShellMemory;

        $arr = array();
        $filename = strtok( $output, "\n" );
        while ( $filename !== false ) {
            if ( $filename !== '' ) {
                $arr[] = "$path/$filename";
            }
            $filename = strtok( "\n" );
        }

        return $arr;
    }

    private function isSuitableFile( $file ) {
        $file = str_replace( '\\', '/', $file );
        $ext = pathinfo( $file, PATHINFO_EXTENSION );
        if ( $ext != 'php' && $ext != 'inc' && $ext != 'php5' ) {
            return false;
        }
        foreach ( $this->mIgnorePaths as $regex ) {
            $m = array();
            if ( preg_match( "~{$regex}~", $file, $m ) ) {
                return false;
            }
        }

        return true;
    }

    private function addPath( $path ) {
        global $IP;

        return $this->addFileOrDir( $path ) || $this->addFileOrDir( "$IP/$path" );
    }

    private function addFileOrDir( $path ) {
        if ( is_dir( $path ) ) {
            $this->addDirectoryContent( $path );
        } elseif ( file_exists( $path ) ) {
            $this->mFiles[] = $path;
        } else {
            return false;
        }

        return true;
    }

    private function addDirectoryContent( $dir ) {
        $iterator = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator( $dir ),
            RecursiveIteratorIterator::SELF_FIRST
        );
        foreach ( $iterator as $file ) {
            if ( $this->isSuitableFile( $file->getRealPath() ) ) {
                $this->mFiles[] = $file->getRealPath();
            }
        }
    }

    private function checkFileWithParsekit( $file ) {
        static $okErrors = array(
            'Redefining already defined constructor',
            'Assigning the return value of new by reference is deprecated',
        );
        $errors = array();
        parsekit_compile_file( $file, $errors, PARSEKIT_SIMPLE );
        $ret = true;
        if ( $errors ) {
            foreach ( $errors as $error ) {
                foreach ( $okErrors as $okError ) {
                    if ( substr( $error['errstr'], 0, strlen( $okError ) ) == $okError ) {
                        continue 2;
                    }
                }
                $ret = false;
                $this->output( "Error in $file line {$error['lineno']}: {$error['errstr']}\n" );
                $this->mFailures[$file] = $errors;
            }
        }

        return $ret;
    }

    private function checkFileWithCli( $file ) {
        $res = exec( 'php -l ' . wfEscapeShellArg( $file ) );
        if ( strpos( $res, 'No syntax errors detected' ) === false ) {
            $this->mFailures[$file] = $res;
            $this->output( $res . "\n" );

            return false;
        }

        return true;
    }

    private function checkForMistakes( $file ) {
        foreach ( $this->mNoStyleCheckPaths as $regex ) {
            $m = array();
            if ( preg_match( "~{$regex}~", $file, $m ) ) {
                return;
            }
        }

        $text = file_get_contents( $file );
        $tokens = token_get_all( $text );

        $this->checkEvilToken( $file, $tokens, '@', 'Error supression operator (@)' );
        $this->checkRegex( $file, $text, '/^[\s\r\n]+<\?/', 'leading whitespace' );
        $this->checkRegex( $file, $text, '/\?>[\s\r\n]*$/', 'trailing ?>' );
        $this->checkRegex( $file, $text, '/^[\xFF\xFE\xEF]/', 'byte-order mark' );
    }

    private function checkRegex( $file, $text, $regex, $desc ) {
        if ( !preg_match( $regex, $text ) ) {
            return;
        }

        if ( !isset( $this->mWarnings[$file] ) ) {
            $this->mWarnings[$file] = array();
        }
        $this->mWarnings[$file][] = $desc;
        $this->output( "Warning in file $file: $desc found.\n" );
    }

    private function checkEvilToken( $file, $tokens, $evilToken, $desc ) {
        if ( !in_array( $evilToken, $tokens ) ) {
            return;
        }

        if ( !isset( $this->mWarnings[$file] ) ) {
            $this->mWarnings[$file] = array();
        }
        $this->mWarnings[$file][] = $desc;
        $this->output( "Warning in file $file: $desc found.\n" );
    }
}

$maintClass = "CheckSyntax";
require_once RUN_MAINTENANCE_IF_MAIN;