Extract common logic for adding a new adapter in exthost

Extract function for the following pattern used a number of times in `ExtHostLanguageFeatures`:

```
const handle = this._nextHandle();
this._adapter.set(handle, new OutlineAdapter(this._documents, provider));
```

src/vs/workbench/api/node/extHostLanguageFeatures.ts

@@ -824,11 +824,16 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 		return callback(<any>adapter);
 	}
 
+	private _addNewAdapter(adapter: Adapter): number {
+		const handle = this._nextHandle();
+		this._adapter.set(handle, adapter);
+		return handle;
+	}
+
 	// --- outline
 
 	registerDocumentSymbolProvider(selector: vscode.DocumentSelector, provider: vscode.DocumentSymbolProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new OutlineAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new OutlineAdapter(this._documents, provider));
 		this._proxy.$registerOutlineSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -866,8 +871,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- declaration
 
 	registerDefinitionProvider(selector: vscode.DocumentSelector, provider: vscode.DefinitionProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new DefinitionAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new DefinitionAdapter(this._documents, provider));
 		this._proxy.$registerDeclaractionSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -877,8 +881,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	}
 
 	registerImplementationProvider(selector: vscode.DocumentSelector, provider: vscode.ImplementationProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new ImplementationAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new ImplementationAdapter(this._documents, provider));
 		this._proxy.$registerImplementationSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -888,8 +891,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	}
 
 	registerTypeDefinitionProvider(selector: vscode.DocumentSelector, provider: vscode.TypeDefinitionProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new TypeDefinitionAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new TypeDefinitionAdapter(this._documents, provider));
 		this._proxy.$registerTypeDefinitionSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -901,8 +903,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- extra info
 
 	registerHoverProvider(selector: vscode.DocumentSelector, provider: vscode.HoverProvider, extensionId?: string): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new HoverAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new HoverAdapter(this._documents, provider));
 		this._proxy.$registerHoverProvider(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -914,8 +915,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- occurrences
 
 	registerDocumentHighlightProvider(selector: vscode.DocumentSelector, provider: vscode.DocumentHighlightProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new DocumentHighlightAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new DocumentHighlightAdapter(this._documents, provider));
 		this._proxy.$registerDocumentHighlightProvider(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -927,8 +927,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- references
 
 	registerReferenceProvider(selector: vscode.DocumentSelector, provider: vscode.ReferenceProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new ReferenceAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new ReferenceAdapter(this._documents, provider));
 		this._proxy.$registerReferenceSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -940,8 +939,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- quick fix
 
 	registerCodeActionProvider(selector: vscode.DocumentSelector, provider: vscode.CodeActionProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new CodeActionAdapter(this._documents, this._commands.converter, this._diagnostics, provider));
+		const handle = this._addNewAdapter(new CodeActionAdapter(this._documents, this._commands.converter, this._diagnostics, provider));
 		this._proxy.$registerQuickFixSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -953,8 +951,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- formatting
 
 	registerDocumentFormattingEditProvider(selector: vscode.DocumentSelector, provider: vscode.DocumentFormattingEditProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new DocumentFormattingAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new DocumentFormattingAdapter(this._documents, provider));
 		this._proxy.$registerDocumentFormattingSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -964,8 +961,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	}
 
 	registerDocumentRangeFormattingEditProvider(selector: vscode.DocumentSelector, provider: vscode.DocumentRangeFormattingEditProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new RangeFormattingAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new RangeFormattingAdapter(this._documents, provider));
 		this._proxy.$registerRangeFormattingSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -975,8 +971,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	}
 
 	registerOnTypeFormattingEditProvider(selector: vscode.DocumentSelector, provider: vscode.OnTypeFormattingEditProvider, triggerCharacters: string[]): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new OnTypeFormattingAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new OnTypeFormattingAdapter(this._documents, provider));
 		this._proxy.$registerOnTypeFormattingSupport(handle, selector, triggerCharacters);
 		return this._createDisposable(handle);
 	}
@@ -988,8 +983,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- navigate types
 
 	registerWorkspaceSymbolProvider(provider: vscode.WorkspaceSymbolProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new NavigateTypeAdapter(provider));
+		const handle = this._addNewAdapter(new NavigateTypeAdapter(provider));
 		this._proxy.$registerNavigateTypeSupport(handle);
 		return this._createDisposable(handle);
 	}
@@ -1009,8 +1003,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- rename
 
 	registerRenameProvider(selector: vscode.DocumentSelector, provider: vscode.RenameProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new RenameAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new RenameAdapter(this._documents, provider));
 		this._proxy.$registerRenameSupport(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -1022,8 +1015,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- suggestion
 
 	registerCompletionItemProvider(selector: vscode.DocumentSelector, provider: vscode.CompletionItemProvider, triggerCharacters: string[]): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new SuggestAdapter(this._documents, this._commands.converter, provider));
+		const handle = this._addNewAdapter(new SuggestAdapter(this._documents, this._commands.converter, provider));
 		this._proxy.$registerSuggestSupport(handle, selector, triggerCharacters, SuggestAdapter.supportsResolving(provider));
 		return this._createDisposable(handle);
 	}
@@ -1043,8 +1035,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- parameter hints
 
 	registerSignatureHelpProvider(selector: vscode.DocumentSelector, provider: vscode.SignatureHelpProvider, triggerCharacters: string[]): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new SignatureHelpAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new SignatureHelpAdapter(this._documents, provider));
 		this._proxy.$registerSignatureHelpProvider(handle, selector, triggerCharacters);
 		return this._createDisposable(handle);
 	}
@@ -1056,8 +1047,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	// --- links
 
 	registerDocumentLinkProvider(selector: vscode.DocumentSelector, provider: vscode.DocumentLinkProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new LinkProviderAdapter(this._documents, this._heapService, provider));
+		const handle = this._addNewAdapter(new LinkProviderAdapter(this._documents, this._heapService, provider));
 		this._proxy.$registerDocumentLinkProvider(handle, selector);
 		return this._createDisposable(handle);
 	}
@@ -1071,8 +1061,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 	}
 
 	registerColorProvider(selector: vscode.DocumentSelector, provider: vscode.DocumentColorProvider): vscode.Disposable {
-		const handle = this._nextHandle();
-		this._adapter.set(handle, new ColorProviderAdapter(this._documents, provider));
+		const handle = this._addNewAdapter(new ColorProviderAdapter(this._documents, provider));
 		this._proxy.$registerDocumentColorProvider(handle, selector);
 		return this._createDisposable(handle);
 	}