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import * as lc from 'vscode-languageclient/node';
import * as vscode from 'vscode';
import * as ra from '../src/lsp_ext';
import * as Is from 'vscode-languageclient/lib/common/utils/is';
import { DocumentSemanticsTokensSignature, DocumentSemanticsTokensEditsSignature, DocumentRangeSemanticTokensSignature } from 'vscode-languageclient/lib/common/semanticTokens';
import { assert } from './util';
import { WorkspaceEdit } from 'vscode';
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;
}
// Workaround for https://github.com/microsoft/vscode-languageserver-node/issues/576
async function semanticHighlightingWorkaround<R, F extends (...args: any[]) => vscode.ProviderResult<R>>(next: F, ...args: Parameters<F>): Promise<R> {
const res = await next(...args);
if (res == null) throw new Error('busy');
return res;
}
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"),
diagnosticCollectionName: "rustc",
traceOutputChannel,
middleware: {
provideDocumentSemanticTokens(document: vscode.TextDocument, token: vscode.CancellationToken, next: DocumentSemanticsTokensSignature): vscode.ProviderResult<vscode.SemanticTokens> {
return semanticHighlightingWorkaround(next, document, token);
},
provideDocumentSemanticTokensEdits(document: vscode.TextDocument, previousResultId: string, token: vscode.CancellationToken, next: DocumentSemanticsTokensEditsSignature): vscode.ProviderResult<vscode.SemanticTokensEdits | vscode.SemanticTokens> {
return semanticHighlightingWorkaround(next, document, previousResultId, token);
},
provideDocumentRangeSemanticTokens(document: vscode.TextDocument, range: vscode.Range, token: vscode.CancellationToken, next: DocumentRangeSemanticTokensSignature): vscode.ProviderResult<vscode.SemanticTokens> {
return semanticHighlightingWorkaround(next, document, range, token);
},
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 = (<any>result).actions;
if (actions) {
hover.contents.push(renderHoverActions(actions));
}
}
return hover;
},
(error) => {
client.handleFailedRequest(lc.HoverRequest.type, error, null);
return Promise.resolve(null);
});
},
// Using custom handling of CodeActions to support action groups and snippet edits.
// Note that this means we have to re-implement lazy edit resolving ourselves as well.
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<string, { index: number; items: vscode.CodeAction[] }>();
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 kind = client.protocol2CodeConverter.asCodeActionKind((item as any).kind);
const action = new vscode.CodeAction(item.title, kind);
const group = (item as any).group;
action.command = {
command: "rust-analyzer.resolveCodeAction",
title: item.title,
arguments: [item],
};
// Set a dummy edit, so that VS Code doesn't try to resolve this.
action.edit = new WorkspaceEdit();
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.kind = items[0].kind;
action.command = {
command: "rust-analyzer.applyActionGroup",
title: "",
arguments: [items.map((item) => {
return { label: item.title, arguments: item.command!!.arguments!![0] };
})],
};
// Set a dummy edit, so that VS Code doesn't try to resolve this.
action.edit = new WorkspaceEdit();
result[index] = action;
}
}
return result;
},
(_error) => undefined
);
}
}
};
const client = new lc.LanguageClient(
'rust-analyzer',
'Rust Analyzer Language Server',
serverOptions,
clientOptions,
);
// To turn on all proposed features use: client.registerProposedFeatures();
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.hoverActions = true;
caps.statusNotification = true;
capabilities.experimental = caps;
}
initialize(_capabilities: lc.ServerCapabilities<any>, _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);
}
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