- (feat) add concept of post processors

- (feat) add 'key as default value' post processor (closes #109)
- (chore) move clean functionality to a post processor
- (chore) move sort functionality to a post processor
- (refactor) get rid of leading underscore on protected properties/methods

src/post-processors/key-as-default-value.post-processor.ts

@@ -0,0 +1,12 @@
+import { TranslationCollection } from '../utils/translation.collection';
+import { PostProcessorInterface } from './post-processor.interface';
+
+export class KeyAsDefaultValuePostProcessor implements PostProcessorInterface {
+
+	public name: string = 'KeyAsDefaultValue';
+
+	public process(working: TranslationCollection, extracted: TranslationCollection, existing: TranslationCollection): TranslationCollection {
+		return working.map((key, val) => val === '' ? key : val);
+	}
+
+}

src/post-processors/post-processor.interface.ts

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+import { TranslationCollection } from '../utils/translation.collection';
+
+export interface PostProcessorInterface {
+
+	name: string;
+
+	process(working: TranslationCollection, extracted: TranslationCollection, existing: TranslationCollection): TranslationCollection;
+
+}

src/post-processors/purge-obsolete-keys.post-processor.ts

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+import { TranslationCollection } from '../utils/translation.collection';
+import { PostProcessorInterface } from './post-processor.interface';
+
+export class PurgeObsoleteKeysPostProcessor implements PostProcessorInterface {
+
+	public name: string = 'PurgeObsoleteKeys';
+
+	public process(working: TranslationCollection, extracted: TranslationCollection, existing: TranslationCollection): TranslationCollection {
+		return working.intersect(extracted);
+	}
+
+}

src/post-processors/sort-by-key.post-processor.ts

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+import { TranslationCollection } from '../utils/translation.collection';
+import { PostProcessorInterface } from './post-processor.interface';
+
+export class SortByKeyPostProcessor implements PostProcessorInterface {
+
+	public name: string = 'SortByKey';
+
+	public process(working: TranslationCollection, extracted: TranslationCollection, existing: TranslationCollection): TranslationCollection {
+		return working.sort();
+	}
+
+}