export function createXlfFiles()

in src/main.ts [532:582]
44 lines of code
11 McCabe index (conditional complexity)

export function createXlfFiles(projectName: string, extensionName: string): ThroughStream {
	let _xlf: XLF;
	let header: BundledMetaDataHeader | undefined;
	let data: BundledMetaDataFile | undefined;
	function getXlf() {
		if (!_xlf) {
			_xlf = new XLF(projectName);
		}
		return _xlf;
	}
	return through(function (this: ThroughStream, file: File) {
		if (!file.isBuffer()) {
			this.emit('error', `File ${file.path} is not a buffer`);
			return;
		}
		const buffer: Buffer = file.contents as Buffer;
		const basename = path.basename(file.path);
		if (basename === 'package.nls.json') {
			const json: PackageJsonFormat = JSON.parse(buffer.toString('utf8'));
			const keys = Object.keys(json);
			const messages = keys.map((key) => {
				const value = json[key];
				return value === undefined ? `Unknown message for key: ${key}` : value;
			});
			getXlf().addFile('package', keys, messages);
		} else if (basename === 'nls.metadata.json') {
			data = JSON.parse(buffer.toString('utf8'));
		} else if (basename === 'nls.metadata.header.json') {
			header = JSON.parse(buffer.toString('utf8'));
		} else {
			this.emit('error', new Error(`${file.path} is not a valid nls or meta data file`));
			return;
		}
	}, function (this: ThroughStream) {
		if (header && data) {
			const outDir = header.outDir;
			for (const module in data) {
				const fileContent: BundledMetaDataEntry = data[module];
				// in the XLF files we only use forward slashes.
				getXlf().addFile(`${outDir}/${module.replace(/\\/g, '/')}`, fileContent.keys, fileContent.messages);
			}
		}
		if (_xlf) {
			const xlfFile = new File({
				path: path.join(projectName, extensionName + '.xlf'),
				contents: new Buffer(_xlf.toString(), 'utf8')
			});
			this.queue(xlfFile);
		}
		this.queue(null);
	});