ResourceLoaderOOUIImageModule.php

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<?php
class ResourceLoaderOOUIImageModule extends ResourceLoaderImageModule {
    protected function loadFromDefinition() {
        if ( $this->definition === null ) {
            return;
        }

        // Core default themes
        $themes = [ 'default' => 'mediawiki' ];
        $themes += ExtensionRegistry::getInstance()->getAttribute( 'SkinOOUIThemes' );

        $name = $this->definition['name'];
        $rootPath = $this->definition['rootPath'];

        $definition = [];
        foreach ( $themes as $skin => $theme ) {
            // TODO Allow extensions to specify this path somehow
            $dataPath = $this->localBasePath . '/' . $rootPath . '/' . $theme . '/' . $name . '.json';

            if ( file_exists( $dataPath ) ) {
                $data = json_decode( file_get_contents( $dataPath ), true );
                $fixPath = function ( &$path ) use ( $rootPath, $theme ) {
                    // TODO Allow extensions to specify this path somehow
                    $path = $rootPath . '/' . $theme . '/' . $path;
                };
                array_walk( $data['images'], function ( &$value ) use ( $fixPath ) {
                    if ( is_string( $value['file'] ) ) {
                        $fixPath( $value['file'] );
                    } elseif ( is_array( $value['file'] ) ) {
                        array_walk_recursive( $value['file'], $fixPath );
                    }
                } );
            } else {
                $data = [];
            }

            foreach ( $data as $key => $value ) {
                switch ( $key ) {
                    case 'images':
                    case 'variants':
                        $definition[$key][$skin] = $data[$key];
                        break;

                    default:
                        if ( !isset( $definition[$key] ) ) {
                            $definition[$key] = $data[$key];
                        } elseif ( $definition[$key] !== $data[$key] ) {
                            throw new Exception(
                                "Mismatched OOUI theme definitions are not supported: trying to load $key of $theme theme"
                            );
                        }
                        break;
                }
            }
        }

        // Fields from definition silently override keys from JSON files
        $this->definition += $definition;

        parent::loadFromDefinition();
    }
}