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import * as vscode from 'vscode';
import { Range, TextDocumentIdentifier } from 'vscode-languageclient';
import { Server } from '../server';
export const syntaxTreeUri = vscode.Uri.parse('rust-analyzer://syntaxtree');
export class SyntaxTreeContentProvider
implements vscode.TextDocumentContentProvider {
public eventEmitter = new vscode.EventEmitter<vscode.Uri>();
public syntaxTree: string = 'Not available';
public provideTextDocumentContent(
uri: vscode.Uri
): vscode.ProviderResult<string> {
const editor = vscode.window.activeTextEditor;
if (editor == null) {
return '';
}
let range: Range | undefined;
// When the range based query is enabled we take the range of the selection
if (uri.query === 'range=true') {
range = editor.selection.isEmpty
? undefined
: Server.client.code2ProtocolConverter.asRange(
editor.selection
);
}
const request: SyntaxTreeParams = {
textDocument: { uri: editor.document.uri.toString() },
range
};
return Server.client.sendRequest<SyntaxTreeResult>(
'rust-analyzer/syntaxTree',
request
);
}
get onDidChange(): vscode.Event<vscode.Uri> {
return this.eventEmitter.event;
}
}
interface SyntaxTreeParams {
textDocument: TextDocumentIdentifier;
range?: Range;
}
type SyntaxTreeResult = string;
// Opens the virtual file that will show the syntax tree
//
// The contents of the file come from the `TextDocumentContentProvider`
export function createHandle(provider: SyntaxTreeContentProvider) {
return async () => {
const editor = vscode.window.activeTextEditor;
const rangeEnabled = !!(editor && !editor.selection.isEmpty);
const uri = rangeEnabled
? vscode.Uri.parse(`${syntaxTreeUri.toString()}?range=true`)
: syntaxTreeUri;
const document = await vscode.workspace.openTextDocument(uri);
provider.eventEmitter.fire(uri);
return vscode.window.showTextDocument(
document,
vscode.ViewColumn.Two,
true
);
};
}
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