editors/code/src/commands/expand_macro.ts

   1 import * as vscode from 'vscode';
   2 import { Position, TextDocumentIdentifier } from 'vscode-languageclient';
   3 import { Server } from '../server';
   4
   5 interface ExpandedMacro {
   6     name: string,
   7     expansion: string,
   8 }
   9
  10 function code_format(expanded: ExpandedMacro): vscode.MarkdownString {
  11     const markdown = new vscode.MarkdownString(
  12         `#### Recursive expansion of ${expanded.name}! macro`
  13     );
  14     markdown.appendCodeblock(expanded.expansion, 'rust');
  15     return markdown;
  16 }
  17
  18 export class ExpandMacroHoverProvider implements vscode.HoverProvider {
  19     public provideHover(
  20         document: vscode.TextDocument,
  21         position: vscode.Position,
  22         token: vscode.CancellationToken
  23     ): Thenable<vscode.Hover | null> | null {
  24         async function handle() {
  25             const request: MacroExpandParams = {
  26                 textDocument: { uri: document.uri.toString() },
  27                 position
  28             };
  29             const result = await Server.client.sendRequest<ExpandedMacro>(
  30                 'rust-analyzer/expandMacro',
  31                 request
  32             );
  33             if (result != null) {
  34                 const formated = code_format(result);
  35                 return new vscode.Hover(formated);
  36             }
  37
  38             return null;
  39         }
  40
  41         return handle();
  42     }
  43 }
  44
  45 interface MacroExpandParams {
  46     textDocument: TextDocumentIdentifier;
  47     position: Position;
  48 }