Clean up document link resolve (microsoft#154959)

- Move vscode scheme normalization to the DocumentLinkProvider
- Remove extra function since we already recognize uri-like links

Author: mjbvz

extensions/markdown-language-features/src/languageFeatures/documentLinks.ts

@@ -13,7 +13,7 @@ import { getLine, ITextDocument } from '../types/textDocument';
 import { coalesce } from '../util/arrays';
 import { noopToken } from '../util/cancellation';
 import { Disposable } from '../util/dispose';
-import { getUriForLinkWithKnownExternalScheme, isOfScheme, Schemes } from '../util/schemes';
+import { Schemes } from '../util/schemes';
 import { MdDocumentInfoCache } from '../util/workspaceCache';
 import { IMdWorkspace } from '../workspace';
 
@@ -43,14 +43,6 @@ function resolveLink(
 	link: string,
 ): ExternalHref | InternalHref | undefined {
 	const cleanLink = stripAngleBrackets(link);
-	const externalSchemeUri = getUriForLinkWithKnownExternalScheme(cleanLink);
-	if (externalSchemeUri) {
-		// Normalize VS Code links to target currently running version
-		if (isOfScheme(Schemes.vscode, link) || isOfScheme(Schemes['vscode-insiders'], link)) {
-			return { kind: 'external', uri: vscode.Uri.parse(link).with({ scheme: vscode.env.uriScheme }) };
-		}
-		return { kind: 'external', uri: externalSchemeUri };
-	}
 
 	if (/^[a-z\-][a-z\-]+:/i.test(cleanLink)) {
 		// Looks like a uri
@@ -573,6 +565,11 @@ export class MdVsCodeLinkProvider implements vscode.DocumentLinkProvider {
 	private toValidDocumentLink(link: MdLink, definitionSet: LinkDefinitionSet): vscode.DocumentLink | undefined {
 		switch (link.href.kind) {
 			case 'external': {
+				let target = link.href.uri;
+				// Normalize VS Code links to target currently running version
+				if (link.href.uri.scheme === Schemes.vscode || link.href.uri.scheme === Schemes['vscode-insiders']) {
+					target = target.with({ scheme: vscode.env.uriScheme });
+				}
 				return new vscode.DocumentLink(link.source.hrefRange, link.href.uri);
 			}
 			case 'internal': {

extensions/markdown-language-features/src/util/schemes.ts

@@ -3,33 +3,15 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import * as vscode from 'vscode';
-
 export const Schemes = Object.freeze({
-	http: 'http',
-	https: 'https',
 	file: 'file',
 	untitled: 'untitled',
 	mailto: 'mailto',
-	data: 'data',
 	vscode: 'vscode',
 	'vscode-insiders': 'vscode-insiders',
 	notebookCell: 'vscode-notebook-cell',
 });
 
-const knownSchemes = [
-	...Object.values(Schemes),
-	`${vscode.env.uriScheme}`
-];
-
-export function getUriForLinkWithKnownExternalScheme(link: string): vscode.Uri | undefined {
-	if (knownSchemes.some(knownScheme => isOfScheme(knownScheme, link))) {
-		return vscode.Uri.parse(link);
-	}
-
-	return undefined;
-}
-
 export function isOfScheme(scheme: string, link: string): boolean {
 	return link.toLowerCase().startsWith(scheme + ':');
 }