rust-analyzer/editors/code/src/commands/matching_brace.ts

import * as vscode from 'vscode';

import { Position, TextDocumentIdentifier } from 'vscode-languageclient';
import { Server } from '../server';

interface FindMatchingBraceParams {
    textDocument: TextDocumentIdentifier;
    offsets: Position[];
}

export async function handle() {
    const editor = vscode.window.activeTextEditor;
    if (editor == null || editor.document.languageId !== 'rust') {
        return;
    }
    const request: FindMatchingBraceParams = {
        textDocument: { uri: editor.document.uri.toString() },
        offsets: editor.selections.map(s => {
            return Server.client.code2ProtocolConverter.asPosition(s.active);
        })
    };
    const response = await Server.client.sendRequest<Position[]>(
        'rust-analyzer/findMatchingBrace',
        request
    );
    editor.selections = editor.selections.map((sel, idx) => {
        const active = Server.client.protocol2CodeConverter.asPosition(
            response[idx]
        );
        const anchor = sel.isEmpty ? active : sel.anchor;
        return new vscode.Selection(anchor, active);
    });
    editor.revealRange(editor.selection);
}