Move extractor to utils

src/utils/extractor.ts

@@ -0,0 +1,38 @@
+import { ParserInterface } from '../parsers/parser.interface';
+import { TranslationCollection } from './translation.collection';
+
+import * as glob from 'glob';
+import * as fs from 'fs';
+
+export class Extractor {
+
+	public constructor(public parsers: ParserInterface[], public patterns: string[]) { }
+
+	/**
+	 * Extract strings from dir
+	 */
+	public process(dir: string): TranslationCollection {
+		let collection: TranslationCollection = new TranslationCollection();
+
+		this._readDir(dir, this.patterns).forEach(path => {
+			const contents: string = fs.readFileSync(path, 'utf-8');
+			this.parsers.forEach((parser: ParserInterface) => {
+				collection = collection.union(parser.extract(contents, path));
+			});
+		});
+
+		return collection;
+	}
+
+	/**
+	 * Get all files in dir matching patterns
+	 */
+	protected _readDir(dir: string, patterns: string[]): string[] {
+		return patterns.reduce((results, pattern) => {
+			return glob.sync(dir + pattern)
+				.filter(path => fs.statSync(path).isFile())
+				.concat(results);
+		}, []);
+	}
+
+}