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hover.ts
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hover.ts
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/* --------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
* ------------------------------------------------------------------------------------------ */
import {
languages as Languages, TextDocument, Disposable, Position as VPosition, CancellationToken, ProviderResult, HoverProvider, Hover as VHover
} from 'vscode';
import {
ClientCapabilities, DocumentSelector, HoverOptions, HoverRegistrationOptions, HoverRequest, MarkupKind, ServerCapabilities
} from 'vscode-languageserver-protocol';
import {
FeatureClient, ensure, TextDocumentLanguageFeature
} from './features';
import * as UUID from './utils/uuid';
export interface ProvideHoverSignature {
(this: void, document: TextDocument, position: VPosition, token: CancellationToken): ProviderResult<VHover>;
}
export interface HoverMiddleware {
provideHover?: (this: void, document: TextDocument, position: VPosition, token: CancellationToken, next: ProvideHoverSignature) => ProviderResult<VHover>;
}
export class HoverFeature extends TextDocumentLanguageFeature<boolean | HoverOptions, HoverRegistrationOptions, HoverProvider, HoverMiddleware> {
constructor(client: FeatureClient<HoverMiddleware>) {
super(client, HoverRequest.type);
}
public fillClientCapabilities(capabilities: ClientCapabilities): void {
const hoverCapability = (ensure(ensure(capabilities, 'textDocument')!, 'hover')!);
hoverCapability.dynamicRegistration = true;
hoverCapability.contentFormat = [MarkupKind.Markdown, MarkupKind.PlainText];
}
public initialize(capabilities: ServerCapabilities, documentSelector: DocumentSelector): void {
const options = this.getRegistrationOptions(documentSelector, capabilities.hoverProvider);
if (!options) {
return;
}
this.register({
id: UUID.generateUuid(),
registerOptions: options
});
}
protected registerLanguageProvider(options: HoverRegistrationOptions): [Disposable, HoverProvider] {
const selector = options.documentSelector!;
const provider: HoverProvider = {
provideHover: (document, position, token) => {
const client = this._client;
const provideHover: ProvideHoverSignature = (document, position, token) => {
return client.sendRequest(HoverRequest.type, client.code2ProtocolConverter.asTextDocumentPositionParams(document, position), token).then((result) => {
if (token.isCancellationRequested) {
return null;
}
return client.protocol2CodeConverter.asHover(result);
}, (error) => {
return client.handleFailedRequest(HoverRequest.type, token, error, null);
});
};
const middleware = client.middleware;
return middleware.provideHover
? middleware.provideHover(document, position, token, provideHover)
: provideHover(document, position, token);
}
};
return [this.registerProvider(selector, provider), provider];
}
private registerProvider(selector: DocumentSelector, provider: HoverProvider): Disposable {
return Languages.registerHoverProvider(this._client.protocol2CodeConverter.asDocumentSelector(selector), provider);
}
}