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import * as vscode from 'vscode';
import * as lc from 'vscode-languageclient';
import { Ctx, Cmd } from '../ctx';
// Opens the virtual file that will show the syntax tree
//
// The contents of the file come from the `TextDocumentContentProvider`
export function expandMacro(ctx: Ctx): Cmd {
const tdcp = new TextDocumentContentProvider(ctx);
ctx.pushCleanup(
vscode.workspace.registerTextDocumentContentProvider(
'rust-analyzer',
tdcp,
),
);
return async () => {
const document = await vscode.workspace.openTextDocument(tdcp.uri);
tdcp.eventEmitter.fire(tdcp.uri);
return vscode.window.showTextDocument(
document,
vscode.ViewColumn.Two,
true,
);
};
}
interface ExpandedMacro {
name: string;
expansion: string;
}
function code_format(expanded: ExpandedMacro): string {
let result = `// Recursive expansion of ${expanded.name}! macro\n`;
result += '// ' + '='.repeat(result.length - 3);
result += '\n\n';
result += expanded.expansion;
return result;
}
class TextDocumentContentProvider
implements vscode.TextDocumentContentProvider {
uri = vscode.Uri.parse('rust-analyzer://expandMacro/[EXPANSION].rs');
eventEmitter = new vscode.EventEmitter<vscode.Uri>();
constructor(private readonly ctx: Ctx) {
}
async provideTextDocumentContent(_uri: vscode.Uri): Promise<string> {
const editor = vscode.window.activeTextEditor;
const client = this.ctx.client;
if (!editor || !client) return '';
const position = editor.selection.active;
const request: lc.TextDocumentPositionParams = {
textDocument: { uri: editor.document.uri.toString() },
position,
};
const expanded = await client.sendRequest<ExpandedMacro>(
'rust-analyzer/expandMacro',
request,
);
if (expanded == null) return 'Not available';
return code_format(expanded);
}
get onDidChange(): vscode.Event<vscode.Uri> {
return this.eventEmitter.event;
}
}
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