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import * as vscode from 'vscode';
import { DecorationOptions, 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 currentDecorations = new Map<string, DecorationOptions[]>();
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 dropHints(document: vscode.TextDocument) {
if (this.displayHints) {
this.currentDecorations.delete(document.uri.toString());
}
}
public async toggleHintsDisplay(displayHints: boolean): Promise<void> {
if (this.displayHints !== displayHints) {
this.displayHints = displayHints;
this.currentDecorations.clear();
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;
}
const documentUri = document.uri.toString();
const documentDecorators = this.currentDecorations.get(documentUri) || [];
if (documentDecorators.length > 0) {
// FIXME a dbg! in the handlers.rs of the server causes
// an endless storm of events with `cause.contentChanges` with the dbg messages, why?
const changesFromFile = cause !== undefined ? cause.contentChanges.filter(changeEvent => this.isEventInFile(document.lineCount, changeEvent)) : [];
if (changesFromFile.length === 0) {
return;
}
const firstShiftedLine = this.getFirstShiftedLine(changesFromFile);
if (firstShiftedLine !== null) {
const unchangedDecorations = documentDecorators.filter(decoration => decoration.range.start.line < firstShiftedLine);
if (unchangedDecorations.length !== documentDecorators.length) {
await editor.setDecorations(typeHintDecorationType, unchangedDecorations);
}
}
}
return await this.updateDecorationsFromServer(documentUri, 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 getFirstShiftedLine(changeEvents: TextDocumentContentChangeEvent[]): number | null {
let topmostUnshiftedLine: number | null = null;
changeEvents
.filter(event => this.isShiftingChange(event))
.forEach(event => {
const shiftedLineNumber = event.range.start.line;
if (topmostUnshiftedLine === null || topmostUnshiftedLine > shiftedLineNumber) {
topmostUnshiftedLine = shiftedLineNumber;
}
});
return topmostUnshiftedLine;
}
private isShiftingChange(event: TextDocumentContentChangeEvent) {
const eventText = event.text;
if (eventText.length === 0) {
return !event.range.isSingleLine;
} else {
return eventText.indexOf('\n') >= 0 || eventText.indexOf('\r') >= 0;
}
}
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}` } },
}
));
this.currentDecorations.set(documentUri, newDecorations);
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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