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import * as vscode from 'vscode';
import {
Range,
TextDocumentChangeEvent,
TextDocumentContentChangeEvent,
TextEditor
} from 'vscode';
import { TextDocumentIdentifier } from 'vscode-languageclient';
import { Server } from '../server';
interface InlayHintsParams {
textDocument: TextDocumentIdentifier;
}
interface InlayHint {
range: 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 loadHints(
editor: vscode.TextEditor | undefined
): Promise<void> {
if (this.displayHints && editor !== undefined) {
await this.updateDecorationsFromServer(
editor.document.uri.toString(),
editor
);
}
}
public async toggleHintsDisplay(displayHints: boolean): Promise<void> {
if (this.displayHints !== displayHints) {
this.displayHints = displayHints;
if (displayHints) {
return this.updateHints();
} else {
const editor = vscode.window.activeTextEditor;
if (editor != null) {
return editor.setDecorations(typeHintDecorationType, []);
}
}
}
}
public async updateHints(cause?: TextDocumentChangeEvent): Promise<void> {
if (!this.displayHints) {
return;
}
const editor = vscode.window.activeTextEditor;
if (editor == null) {
return;
}
const document = cause == null ? editor.document : cause.document;
if (document.languageId !== 'rust') {
return;
}
// If the dbg! macro is used in the lsp-server, an endless stream of events with `cause.contentChanges` with the dbg messages.
// Should not be a real situation, but better to filter such things out.
if (
cause !== undefined &&
cause.contentChanges.filter(changeEvent =>
this.isEventInFile(document.lineCount, changeEvent)
).length === 0
) {
return;
}
return await this.updateDecorationsFromServer(
document.uri.toString(),
editor
);
}
private isEventInFile(
documentLineCount: number,
event: TextDocumentContentChangeEvent
): boolean {
const eventText = event.text;
if (eventText.length === 0) {
return (
event.range.start.line <= documentLineCount ||
event.range.end.line <= documentLineCount
);
} else {
return (
event.range.start.line <= documentLineCount &&
event.range.end.line <= documentLineCount
);
}
}
private async updateDecorationsFromServer(
documentUri: string,
editor: TextEditor
): Promise<void> {
const newHints = (await this.queryHints(documentUri)) || [];
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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