import * as lc from 'vscode-languageclient'; import * as vscode from 'vscode'; import * as ra from '../src/lsp_ext'; import * as Is from 'vscode-languageclient/lib/utils/is'; import { CallHierarchyFeature } from 'vscode-languageclient/lib/callHierarchy.proposed'; import { SemanticTokensFeature, DocumentSemanticsTokensSignature } from 'vscode-languageclient/lib/semanticTokens.proposed'; import { assert } from './util'; function renderCommand(cmd: ra.CommandLink) { return `[${cmd.title}](command:${cmd.command}?${encodeURIComponent(JSON.stringify(cmd.arguments))} '${cmd.tooltip!}')`; } function renderHoverActions(actions: ra.CommandLinkGroup[]): vscode.MarkdownString { const text = actions.map(group => (group.title ? (group.title + " ") : "") + group.commands.map(renderCommand).join(' | ') ).join('___'); const result = new vscode.MarkdownString(text); result.isTrusted = true; return result; } export function createClient(serverPath: string, cwd: string): lc.LanguageClient { // '.' Is the fallback if no folder is open // TODO?: Workspace folders support Uri's (eg: file://test.txt). // It might be a good idea to test if the uri points to a file. const run: lc.Executable = { command: serverPath, options: { cwd }, }; const serverOptions: lc.ServerOptions = { run, debug: run, }; const traceOutputChannel = vscode.window.createOutputChannel( 'Rust Analyzer Language Server Trace', ); const clientOptions: lc.LanguageClientOptions = { documentSelector: [{ scheme: 'file', language: 'rust' }], initializationOptions: vscode.workspace.getConfiguration("rust-analyzer"), traceOutputChannel, middleware: { // Workaround for https://github.com/microsoft/vscode-languageserver-node/issues/576 async provideDocumentSemanticTokens(document: vscode.TextDocument, token: vscode.CancellationToken, next: DocumentSemanticsTokensSignature) { const res = await next(document, token); if (res === undefined) throw new Error('busy'); return res; }, async provideHover(document: vscode.TextDocument, position: vscode.Position, token: vscode.CancellationToken, _next: lc.ProvideHoverSignature) { return client.sendRequest(lc.HoverRequest.type, client.code2ProtocolConverter.asTextDocumentPositionParams(document, position), token).then( (result) => { const hover = client.protocol2CodeConverter.asHover(result); if (hover) { const actions = (result).actions; if (actions) { hover.contents.push(renderHoverActions(actions)); } } return hover; }, (error) => { client.logFailedRequest(lc.HoverRequest.type, error); return Promise.resolve(null); }); }, // Using custom handling of CodeActions where each code action is resloved lazily // That's why we are not waiting for any command or edits async provideCodeActions(document: vscode.TextDocument, range: vscode.Range, context: vscode.CodeActionContext, token: vscode.CancellationToken, _next: lc.ProvideCodeActionsSignature) { const params: lc.CodeActionParams = { textDocument: client.code2ProtocolConverter.asTextDocumentIdentifier(document), range: client.code2ProtocolConverter.asRange(range), context: client.code2ProtocolConverter.asCodeActionContext(context) }; return client.sendRequest(lc.CodeActionRequest.type, params, token).then((values) => { if (values === null) return undefined; const result: (vscode.CodeAction | vscode.Command)[] = []; const groups = new Map(); for (const item of values) { // In our case we expect to get code edits only from diagnostics if (lc.CodeAction.is(item)) { assert(!item.command, "We don't expect to receive commands in CodeActions"); const action = client.protocol2CodeConverter.asCodeAction(item); result.push(action); continue; } assert(isCodeActionWithoutEditsAndCommands(item), "We don't expect edits or commands here"); const action = new vscode.CodeAction(item.title); const group = (item as any).group; const id = (item as any).id; const resolveParams: ra.ResolveCodeActionParams = { id: id, codeActionParams: params }; action.command = { command: "rust-analyzer.resolveCodeAction", title: item.title, arguments: [resolveParams], }; if (group) { let entry = groups.get(group); if (!entry) { entry = { index: result.length, items: [] }; groups.set(group, entry); result.push(action); } entry.items.push(action); } else { result.push(action); } } for (const [group, { index, items }] of groups) { if (items.length === 1) { result[index] = items[0]; } else { const action = new vscode.CodeAction(group); action.command = { command: "rust-analyzer.applyActionGroup", title: "", arguments: [items.map((item) => { return { label: item.title, arguments: item.command!!.arguments!![0] }; })], }; result[index] = action; } } return result; }, (_error) => undefined ); } } as any }; const client = new lc.LanguageClient( 'rust-analyzer', 'Rust Analyzer Language Server', serverOptions, clientOptions, ); // To turn on all proposed features use: client.registerProposedFeatures(); // Here we want to enable CallHierarchyFeature and SemanticTokensFeature // since they are available on stable. // Note that while these features are stable in vscode their LSP protocol // implementations are still in the "proposed" category for 3.16. client.registerFeature(new CallHierarchyFeature(client)); client.registerFeature(new SemanticTokensFeature(client)); client.registerFeature(new ExperimentalFeatures()); return client; } class ExperimentalFeatures implements lc.StaticFeature { fillClientCapabilities(capabilities: lc.ClientCapabilities): void { const caps: any = capabilities.experimental ?? {}; caps.snippetTextEdit = true; caps.codeActionGroup = true; caps.resolveCodeAction = true; caps.hoverActions = true; capabilities.experimental = caps; } initialize(_capabilities: lc.ServerCapabilities, _documentSelector: lc.DocumentSelector | undefined): void { } } function isCodeActionWithoutEditsAndCommands(value: any): boolean { const candidate: lc.CodeAction = value; return candidate && Is.string(candidate.title) && (candidate.diagnostics === void 0 || Is.typedArray(candidate.diagnostics, lc.Diagnostic.is)) && (candidate.kind === void 0 || Is.string(candidate.kind)) && (candidate.edit === void 0 && candidate.command === void 0); }