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import * as vscode from 'vscode';
import * as lc from 'vscode-languageclient';
import { Server } from '../server';
interface InlayHintsParams {
textDocument: lc.TextDocumentIdentifier;
}
interface InlayHint {
range: vscode.Range;
kind: string;
label: string;
}
const typeHintDecorationType = vscode.window.createTextEditorDecorationType({
after: {
color: new vscode.ThemeColor('ralsp.inlayHint'),
},
});
export class HintsUpdater {
private displayHints = true;
public async toggleHintsDisplay(displayHints: boolean): Promise<void> {
if (this.displayHints !== displayHints) {
this.displayHints = displayHints;
return this.refreshVisibleEditorsHints(
displayHints ? undefined : [],
);
}
}
public async refreshHintsForVisibleEditors(
cause?: vscode.TextDocumentChangeEvent,
): Promise<void> {
if (!this.displayHints) return;
if (
cause !== undefined &&
(cause.contentChanges.length === 0 ||
!this.isRustDocument(cause.document))
) {
return;
}
return this.refreshVisibleEditorsHints();
}
private async refreshVisibleEditorsHints(
newDecorations?: vscode.DecorationOptions[],
) {
const promises: Array<Promise<void>> = [];
for (const rustEditor of vscode.window.visibleTextEditors.filter(
editor => this.isRustDocument(editor.document),
)) {
if (newDecorations !== undefined) {
promises.push(
Promise.resolve(
rustEditor.setDecorations(
typeHintDecorationType,
newDecorations,
),
),
);
} else {
promises.push(this.updateDecorationsFromServer(rustEditor));
}
}
for (const promise of promises) {
await promise;
}
}
private isRustDocument(document: vscode.TextDocument): boolean {
return document && document.languageId === 'rust';
}
private async updateDecorationsFromServer(
editor: vscode.TextEditor,
): Promise<void> {
const newHints = await this.queryHints(editor.document.uri.toString());
if (newHints !== null) {
const newDecorations = newHints.map(hint => ({
range: hint.range,
renderOptions: {
after: {
contentText: `: ${hint.label}`,
},
},
}));
return editor.setDecorations(
typeHintDecorationType,
newDecorations,
);
}
}
private async queryHints(documentUri: string): Promise<InlayHint[] | null> {
const request: InlayHintsParams = {
textDocument: { uri: documentUri },
};
const client = Server.client;
return client
.onReady()
.then(() =>
client.sendRequest<InlayHint[] | null>(
'rust-analyzer/inlayHints',
request,
),
);
}
}
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