refactor extra code, duplicates, complexity

- refactor array equality check and add tests
- remove OperatingSystem.Unknown causing extra logic, return undefined instead
- refactor enum validation to share same logic
- refactor scripting language factories to share same logic
- refactor too many args in runCodeAsync
- refactor ScriptCode constructor to reduce complexity
- fix writing useless write to member object since another property write always override it

src/application/Context/ApplicationContext.ts

@@ -5,6 +5,7 @@ import { IApplication } from '@/domain/IApplication';
 import { OperatingSystem } from '@/domain/OperatingSystem';
 import { ICategoryCollection } from '@/domain/ICategoryCollection';
 import { EventSource } from '@/infrastructure/Events/EventSource';
+import { assertInRange } from '@/application/Common/Enum';
 
 type StateMachine = Map<OperatingSystem, ICategoryCollectionState>;
 
@@ -22,7 +23,7 @@ export class ApplicationContext implements IApplicationContext {
         public readonly app: IApplication,
         initialContext: OperatingSystem) {
         validateApp(app);
-        validateOs(initialContext);
+        assertInRange(initialContext, OperatingSystem);
         this.states = initializeStates(app);
         this.changeContext(initialContext);
     }
@@ -50,18 +51,6 @@ function validateApp(app: IApplication) {
     }
 }
 
-function validateOs(os: OperatingSystem) {
-    if (os === undefined) {
-        throw new Error('undefined os');
-    }
-    if (os === OperatingSystem.Unknown) {
-        throw new Error('unknown os');
-    }
-    if (!(os in OperatingSystem)) {
-        throw new Error(`os "${os}" is out of range`);
-    }
-}
-
 function initializeStates(app: IApplication): StateMachine {
     const machine = new Map<OperatingSystem, ICategoryCollectionState>();
     for (const collection of app.collections) {

src/application/Context/State/Code/Generation/CodeBuilderFactory.ts

@@ -1,15 +1,14 @@
+import { ScriptingLanguageFactory } from '@/application/Common/ScriptingLanguage/ScriptingLanguageFactory';
 import { ScriptingLanguage } from '@/domain/ScriptingLanguage';
 import { ICodeBuilder } from './ICodeBuilder';
-import { ICodeBuilderFactory } from './ICodeBuilderFactory';
 import { BatchBuilder } from './Languages/BatchBuilder';
 import { ShellBuilder } from './Languages/ShellBuilder';
+import { ICodeBuilderFactory } from './ICodeBuilderFactory';
 
-export class CodeBuilderFactory implements ICodeBuilderFactory {
-    public create(language: ScriptingLanguage): ICodeBuilder {
-        switch (language) {
-            case ScriptingLanguage.shellscript: return new ShellBuilder();
-            case ScriptingLanguage.batchfile:   return new BatchBuilder();
-            default: throw new RangeError(`unknown language: "${ScriptingLanguage[language]}"`);
-        }
+export class CodeBuilderFactory extends ScriptingLanguageFactory<ICodeBuilder> implements ICodeBuilderFactory {
+    constructor() {
+        super();
+        this.registerGetter(ScriptingLanguage.shellscript, () => new ShellBuilder());
+        this.registerGetter(ScriptingLanguage.batchfile, () => new BatchBuilder());
     }
 }

src/application/Context/State/Code/Generation/ICodeBuilderFactory.ts

@@ -1,6 +1,5 @@
-import { ScriptingLanguage } from '@/domain/ScriptingLanguage';
 import { ICodeBuilder } from './ICodeBuilder';
+import { IScriptingLanguageFactory } from '@/application/Common/ScriptingLanguage/IScriptingLanguageFactory';
 
-export interface ICodeBuilderFactory {
-    create(language: ScriptingLanguage): ICodeBuilder;
+export interface ICodeBuilderFactory extends IScriptingLanguageFactory<ICodeBuilder> {
 }