generateJsonI18n.php

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<?php

require_once __DIR__ . '/Maintenance.php';

class GenerateJsonI18n extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Build JSON messages files from a PHP messages file' );

        $this->addArg( 'phpfile', 'PHP file defining a $messages array', false );
        $this->addArg( 'jsondir', 'Directory to write JSON files to', false );
        $this->addOption( 'extension', 'Perform default conversion on an extension',
            false, true );
        $this->addOption( 'supplementary', 'Find supplementary i18n files in subdirs and convert those',
            false, false );
    }

    public function execute() {
        global $IP;

        $phpfile = $this->getArg( 0 );
        $jsondir = $this->getArg( 1 );
        $extension = $this->getOption( 'extension' );
        $convertSupplementaryI18nFiles = $this->hasOption( 'supplementary' );

        if ( $extension ) {
            if ( $phpfile ) {
                $this->error( "The phpfile is already specified, conflicts with --extension.", 1 );
            }
            $phpfile = "$IP/extensions/$extension/$extension.i18n.php";
        }

        if ( !$phpfile ) {
            $this->error( "I'm here for an argument!" );
            $this->maybeHelp( true );
            // dies.
        }

        if ( $convertSupplementaryI18nFiles ) {
            if ( is_readable( $phpfile ) ) {
                $this->transformI18nFile( $phpfile, $jsondir );
            } else {
                // This is non-fatal because we might want to continue searching for
                // i18n files in subdirs even if the extension does not include a
                // primary i18n.php.
                $this->error( "Warning: no primary i18n file was found." );
            }
            $this->output( "Searching for supplementary i18n files...\n" );
            $dir_iterator = new RecursiveDirectoryIterator( dirname( $phpfile ) );
            $iterator = new RecursiveIteratorIterator(
                $dir_iterator, RecursiveIteratorIterator::LEAVES_ONLY );
            foreach ( $iterator as $path => $fileObject ) {
                if ( fnmatch( "*.i18n.php", $fileObject->getFilename() ) ) {
                    $this->output( "Converting $path.\n" );
                    $this->transformI18nFile( $path );
                }
            }
        } else {
            // Just convert the primary i18n file.
            $this->transformI18nFile( $phpfile, $jsondir );
        }
    }

    public function transformI18nFile( $phpfile, $jsondir = null ) {
        if ( !$jsondir ) {
            // Assume the json directory should be in the same directory as the
            // .i18n.php file.
            $jsondir = dirname( $phpfile ) . "/i18n";
        }
        if ( !is_dir( $jsondir ) ) {
            $this->output( "Creating directory $jsondir.\n" );
            $success = mkdir( $jsondir );
            if ( !$success ) {
                $this->error( "Could not create directory $jsondir", 1 );
            }
        }

        if ( !is_readable( $phpfile ) ) {
            $this->error( "Error reading $phpfile", 1 );
        }
        include $phpfile;
        $phpfileContents = file_get_contents( $phpfile );

        if ( !isset( $messages ) ) {
            $this->error( "PHP file $phpfile does not define \$messages array", 1 );
        }

        if ( !$messages ) {
            $this->error( "PHP file $phpfile contains an empty \$messages array. " .
                "Maybe it was already converted?", 1 );
        }

        if ( !isset( $messages['en'] ) || !is_array( $messages['en'] ) ) {
            $this->error( "PHP file $phpfile does not set language codes", 1 );
        }

        foreach ( $messages as $langcode => $langmsgs ) {
            $authors = $this->getAuthorsFromComment( $this->findCommentBefore(
                "\$messages['$langcode'] =",
                $phpfileContents
            ) );
            // Make sure the @metadata key is the first key in the output
            $langmsgs = array_merge(
                [ '@metadata' => [ 'authors' => $authors ] ],
                $langmsgs
            );

            $jsonfile = "$jsondir/$langcode.json";
            $success = file_put_contents(
                $jsonfile,
                FormatJson::encode( $langmsgs, "\t", FormatJson::ALL_OK ) . "\n"
            );
            if ( $success === false ) {
                $this->error( "FAILED to write $jsonfile", 1 );
            }
            $this->output( "$jsonfile\n" );
        }

        $this->output(
            "All done. To complete the conversion, please do the following:\n" .
            "* Add \$wgMessagesDirs['YourExtension'] = __DIR__ . '/i18n';\n" .
            "* Remove \$wgExtensionMessagesFiles['YourExtension']\n" .
            "* Delete the old PHP message file\n" .
            "This script no longer generates backward compatibility shims! If you need\n" .
            "compatibility with MediaWiki 1.22 and older, use the MediaWiki 1.23 version\n" .
            "of this script instead, or create a shim manually.\n"
        );
    }

    protected function findCommentBefore( $needle, $haystack ) {
        $needlePos = strpos( $haystack, $needle );
        if ( $needlePos === false ) {
            return '';
        }
        // Need to pass a negative offset to strrpos() so it'll search backwards from the
        // offset
        $startPos = strrpos( $haystack, '