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{ String as StringService } from 'services/localization';\r\nimport { ICache, SessionStorageCache } from 'caching';\r\nimport { error } from 'console';\r\nimport * as $ from 'jquery';\r\n\r\ntype CacheKey = [ string, string ];\r\n\r\ninterface ITranslateResultSerialized {\r\n\titemPath: string;\r\n\ttext: string;\r\n\tfound: boolean;\r\n\tdateFetched: string;\r\n\texpires: string;\r\n}\r\n\r\nexport interface ITranslateResult {\r\n\titemPath: string;\r\n\ttext: string;\r\n\tfound: boolean;\r\n\tdateFetched: Date;\r\n\texpires: Date;\r\n}\r\n\r\nexport interface ITranslate {\r\n\t( itemPath: string ): Promise<ITranslateResult>;\r\n\tfetch( immediate?: boolean ): void;\r\n\tdefer(): void;\r\n}\r\n\r\nclass TranslateResult implements ITranslateResult {\r\n\tconstructor( itemPath: string, text: string, found: boolean, dateFetched: Date, expires: Date ) {\r\n\t\tthis.itemPath = itemPath;\r\n\t\tthis.text = text;\r\n\t\tthis.found = found;\r\n\t\tthis.dateFetched = new Date( dateFetched.getTime() );\r\n\t\tthis.expires = new Date( expires.getTime() );\r\n\t}\r\n\r\n\tpublic itemPath: string;\r\n\tpublic text: string;\r\n\tpublic found: boolean;\r\n\tpublic dateFetched: Date;\r\n\tpublic expires: Date;\r\n\r\n\tpublic serialize(): ITranslateResultSerialized {\r\n\t\tconst { itemPath, text, found, dateFetched, expires } = this;\r\n\t\treturn { itemPath, text, found, dateFetched: dateFetched.toUTCString(), expires: expires.toUTCString() };\r\n\t}\r\n\r\n\tpublic static deserialize( data: ITranslateResultSerialized ) {\r\n\t\tconst { itemPath, text, found, dateFetched, expires } = data;\r\n\t\treturn new TranslateResult( itemPath, text, found, new Date( dateFetched ), new Date( expires ) );\r\n\t}\r\n}\r\n\r\ninterface IQueuedTranslate {\r\n\titemPath: string;\r\n\tpromise: Promise<ITranslateResult>;\r\n\tresolve( result: ITranslateResult ): void;\r\n\tresolve( result: PromiseLike<ITranslateResult> ): void;\r\n\treject( result?: ITranslateResult ): void;\r\n}\r\n\r\nexport const currentLanguage = $( 'html' ).attr( 'lang' ) || 'en';\r\nexport const currentSite = $( 'html' ).attr( 'data-site' ) || 'US';\r\n\r\nexport const translate: ITranslate = ( () => {\r\n\tlet defer = 0;\r\n\tconst queue: Array<IQueuedTranslate> = [],\r\n\t\tcache: ICache<CacheKey, ITranslateResultSerialized> = new SessionStorageCache<CacheKey, ITranslateResultSerialized>( 'translate' ),\r\n\t\tpendingRequests: { [ itemPath: string ]: IQueuedTranslate } = {};\r\n\r\n\tfunction getCachedResult( itemPath: string ): ITranslateResult {\r\n\t\tconst cacheKey: CacheKey = [ currentLanguage, itemPath ],\r\n\t\t\tserializedValue = cache.get( cacheKey );\r\n\t\tif( !serializedValue ) return undefined;\r\n\t\tconst retval = TranslateResult.deserialize( serializedValue );\r\n\t\tif( retval.expires < ( new Date ) ) {\r\n\t\t\tcache.unset( cacheKey );\r\n\t\t\treturn undefined;\r\n\t\t}\r\n\t\treturn retval;\r\n\t}\r\n\r\n\tfunction fetchItems( itemsToFetch: Array<IQueuedTranslate> ) {\r\n\t\tif( itemsToFetch.length <= 0 ) return;\r\n\r\n\t\tconst itemPaths: Array<string> = [];\r\n\r\n\t\tfunction fireCallback( itemResult: ITranslateResult ) {\r\n\t\t\tconst callbackFired: IQueuedTranslate = pendingRequests[ itemResult.itemPath ];\r\n\t\t\tdelete pendingRequests[ itemResult.itemPath ];\r\n\r\n\t\t\tif( !callbackFired ) return;\r\n\r\n\t\t\tsetTimeout( () => {\r\n\t\t\t\tif( itemResult.found ) callbackFired.resolve( itemResult );\r\n\t\t\t\telse callbackFired.reject( itemResult );\r\n\t\t\t}, 0 );\r\n\t\t}\r\n\r\n\t\tfor( let i = 0; i < itemsToFetch.length; i++ ) {\r\n\t\t\tlet itemToFetch = itemsToFetch[ i ],\r\n\t\t\t\titemPath = itemToFetch.itemPath;\r\n\r\n\t\t\tif( pendingRequests.hasOwnProperty( itemPath ) ) {\r\n\t\t\t\titemToFetch.resolve( pendingRequests[ itemPath ].promise );\r\n\t\t\t\treturn;\r\n\t\t\t}\r\n\r\n\t\t\tif( itemPaths.indexOf( itemPath ) < 0 ) itemPaths.push( itemPath );\r\n\r\n\t\t\tpendingRequests[ itemPath ] = itemToFetch;\r\n\t\t}\r\n\r\n\t\tfor( let i = 0; i < itemPaths.length; i++ ) {\r\n\t\t\tlet itemPath = itemPaths[ i ],\r\n\t\t\t\tcachedResult = getCachedResult( itemPath );\r\n\t\t\tif( cachedResult ) {\r\n\t\t\t\tfireCallback( cachedResult );\r\n\t\t\t\titemPaths.splice( i--, 1 );\r\n\t\t\t}\r\n\t\t}\r\n\r\n\t\tif( itemPaths.length <= 0 ) return;\r\n\t\t\t\r\n\t\t( new StringService ).translate( itemPaths, currentLanguage )\r\n\t\t.then(\r\n\t\t\tdata => {\r\n\t\t\t\tconst dateFetched = new Date(),\r\n\t\t\t\t\tttl = data.ttl || 0,\r\n\t\t\t\t\tresults = [];\r\n\t\t\t\tfor( let i = 0; i < data.results.length; i++ ) {\r\n\t\t\t\t\tconst datum = data.results[ i ],\r\n\t\t\t\t\t\tresult = new TranslateResult( datum.itemPath, datum.text, datum.found, dateFetched, new Date( dateFetched.getTime() + ttl ) );\r\n\r\n\t\t\t\t\tif( !result.found ) {\r\n\t\t\t\t\t\terror( `Translate: Dictionary entry not found: ${datum.itemPath}` );\r\n\t\t\t\t\t}\r\n\r\n\t\t\t\t\tcache.set( [ currentLanguage, result.itemPath ], result.serialize() );\r\n\t\t\t\t\tresults.push( result );\r\n\t\t\t\t\tfireCallback( result );\r\n\t\t\t\t}\r\n\t\t\t},\r\n\t\t() => {\r\n\t\t\titemPaths.forEach( itemPath => {\r\n\t\t\t\tconst pendingRequest = pendingRequests[ itemPath ];\r\n\t\t\t\tif( pendingRequest ) {\r\n\t\t\t\t\tpendingRequest.reject();\r\n\t\t\t\t\tdelete pendingRequests[ itemPath ];\r\n\t\t\t\t}\r\n\t\t\t} );\r\n\t\t} );\r\n\t}\r\n\t\t\r\n\tfunction translateImpl( itemPath: string, getPromise: ( itemPath: string ) => Promise<ITranslateResult> ): Promise<ITranslateResult>;\r\n\tfunction translateImpl( itemPaths: Array<string>, getPromise: ( itemPath: string ) => Promise<ITranslateResult> ): Promise<Array<ITranslateResult>>;\r\n\tfunction translateImpl( itemPaths: any, getPromise: ( itemPath: string ) => Promise<ITranslateResult> ): any {\r\n\t\tif( Array.isArray( itemPaths ) ) {\r\n\t\t\ttranslate.defer();\r\n\t\t\tconst retval = Promise.all( (<Array<string>>itemPaths).map( getPromise ) );\r\n\t\t\ttranslate.fetch();\r\n\t\t\treturn retval;\r\n\t\t} else {\r\n\t\t\treturn getPromise( itemPaths );\r\n\t\t}\r\n\t}\r\n\r\n\tfunction getPromise( itemPath: string ) {\r\n\t\tconst queued = queue.filter( q => q.itemPath === itemPath )[ 0 ];\r\n\t\tif( queued ) return queued.promise;\r\n\t\tif( pendingRequests.hasOwnProperty( itemPath ) ) return pendingRequests[ itemPath ].promise;\r\n\r\n\t\tconst itemToFetch = { itemPath, promise: <Promise<any>>null, resolve: <(result?: any) => any>null, reject: <(result?: any) => any>null },\r\n\t\t\tpromise = new Promise<any>( ( resolve, reject ) => {\r\n\t\t\t\titemToFetch.resolve = resolve;\r\n\t\t\t\titemToFetch.reject = reject;\r\n\t\t\t\tif( defer > 0 ) queue.push( itemToFetch );\r\n\t\t\t\telse fetchItems( [ itemToFetch ] );\r\n\t\t\t} );\r\n\t\titemToFetch.promise = promise;\r\n\t\treturn promise;\r\n\t}\r\n\r\n\tfunction getPromiseTry( itemPath: string ) {\r\n\t\treturn getPromise( itemPath ).then( v => v, v => v );\r\n\t}\r\n\r\n\tvar translate: any = itemPaths => translateImpl( itemPaths, getPromise );\r\n\r\n\ttranslate[ 'try' ] = itemPaths => translateImpl( itemPaths, getPromiseTry );\r\n\r\n\ttranslate.fetch = ( immediate?: boolean ) => {\r\n\t\tif( defer > 0 ) {\r\n\t\t\tif( immediate ) defer = 0;\r\n\t\t\telse --defer;\r\n\t\t}\r\n\t\tif( defer <= 0 ) {\r\n\t\t\tdefer = 0;\r\n\t\t\tfetchItems( queue.splice( 0, queue.length ) );\r\n\t\t}\r\n\t};\r\n\r\n\ttranslate.defer = () => { ++defer; };\r\n\r\n\treturn translate;\r\n} )();\r\n"]}