Standardize text/uri-list handling (microsoft#152756)

This creates a common set of functions for creating and parsing the `text/uri-list` mime type. As part of this, I also aligned us with the standard, which uses `\r\n` between lines instead of just `\n`

Author: mjbvz

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

@@ -44,7 +44,7 @@ export async function tryGetUriListSnippet(document: vscode.TextDocument, dataTr
 	}
 
 	const uris: vscode.Uri[] = [];
-	for (const resource of urlList.split('\n')) {
+	for (const resource of urlList.split('\r\n')) {
 		try {
 			uris.push(vscode.Uri.parse(resource));
 		} catch {

src/vs/editor/browser/dnd.ts

@@ -56,12 +56,21 @@ export function addExternalEditorsDropData(dataTransfer: VSDataTransfer, dragEve
 		}
 
 		if (editorData.length) {
-			const str = distinct(editorData).join('\n');
-			dataTransfer.replace(Mimes.uriList, createStringDataTransferItem(str));
+			dataTransfer.replace(Mimes.uriList, createStringDataTransferItem(UriList.create(editorData)));
 		}
 	}
 
 	for (const internal of INTERNAL_DND_MIME_TYPES) {
 		dataTransfer.delete(internal);
 	}
 }
+
+export const UriList = Object.freeze({
+	// http://amundsen.com/hypermedia/urilist/
+	create: (entries: ReadonlyArray<string | URI>): string => {
+		return distinct(entries.map(x => x.toString())).join('\r\n');
+	},
+	parse: (str: string): string[] => {
+		return str.split('\r\n').filter(value => !value.startsWith('#'));
+	}
+});

src/vs/editor/contrib/copyPaste/browser/copyPasteController.ts

@@ -10,7 +10,7 @@ import { createStringDataTransferItem, VSDataTransfer } from 'vs/base/common/dat
 import { Disposable } from 'vs/base/common/lifecycle';
 import { Mimes } from 'vs/base/common/mime';
 import { generateUuid } from 'vs/base/common/uuid';
-import { toVSDataTransfer } from 'vs/editor/browser/dnd';
+import { toVSDataTransfer, UriList } from 'vs/editor/browser/dnd';
 import { ICodeEditor } from 'vs/editor/browser/editorBrowser';
 import { IBulkEditService, ResourceEdit } from 'vs/editor/browser/services/bulkEditService';
 import { EditorOption } from 'vs/editor/common/config/editorOptions';
@@ -176,8 +176,7 @@ export class CopyPasteController extends Disposable implements IEditorContributi
 			if (!dataTransfer.has(Mimes.uriList)) {
 				const resources = await this._clipboardService.readResources();
 				if (resources.length) {
-					const value = resources.join('\n');
-					dataTransfer.append(Mimes.uriList, createStringDataTransferItem(value));
+					dataTransfer.append(Mimes.uriList, createStringDataTransferItem(UriList.create(resources)));
 				}
 			}
 

src/vs/editor/contrib/dropIntoEditor/browser/dropIntoEditorContribution.ts

@@ -9,7 +9,7 @@ import { Disposable } from 'vs/base/common/lifecycle';
 import { Mimes } from 'vs/base/common/mime';
 import { relativePath } from 'vs/base/common/resources';
 import { URI } from 'vs/base/common/uri';
-import { addExternalEditorsDropData, toVSDataTransfer } from 'vs/editor/browser/dnd';
+import { addExternalEditorsDropData, toVSDataTransfer, UriList } from 'vs/editor/browser/dnd';
 import { ICodeEditor } from 'vs/editor/browser/editorBrowser';
 import { registerEditorContribution } from 'vs/editor/browser/editorExtensions';
 import { IBulkEditService, ResourceEdit } from 'vs/editor/browser/services/bulkEditService';
@@ -137,9 +137,9 @@ class DefaultOnDropProvider implements DocumentOnDropEditProvider {
 		return undefined;
 	}
 
-	private getUriListInsertText(urlList: string): string | undefined {
+	private getUriListInsertText(strUriList: string): string | undefined {
 		const uris: URI[] = [];
-		for (const resource of urlList.split('\n')) {
+		for (const resource of UriList.parse(strUriList)) {
 			try {
 				uris.push(URI.parse(resource));
 			} catch {

src/vs/workbench/browser/dnd.ts

@@ -19,6 +19,7 @@ import { FileAccess, Schemas } from 'vs/base/common/network';
 import { isWindows } from 'vs/base/common/platform';
 import { basename, isEqual } from 'vs/base/common/resources';
 import { URI } from 'vs/base/common/uri';
+import { UriList } from 'vs/editor/browser/dnd';
 import { CodeDataTransfers, createDraggedEditorInputFromRawResourcesData, Extensions, extractEditorsAndFilesDropData, IDragAndDropContributionRegistry, IDraggedResourceEditorInput, IResourceStat } from 'vs/platform/dnd/browser/dnd';
 import { IFileService } from 'vs/platform/files/common/files';
 import { IInstantiationService, ServicesAccessor } from 'vs/platform/instantiation/common/instantiation';
@@ -60,7 +61,7 @@ export async function extractTreeDropData(dataTransfer: VSDataTransfer): Promise
 	if (dataTransfer.has(resourcesKey)) {
 		try {
 			const asString = await dataTransfer.get(resourcesKey)?.asString();
-			const rawResourcesData = JSON.stringify(asString?.split('\n').filter(value => !value.startsWith('#')));
+			const rawResourcesData = JSON.stringify(UriList.parse(asString ?? ''));
 			editors.push(...createDraggedEditorInputFromRawResourcesData(rawResourcesData));
 		} catch (error) {
 			// Invalid transfer
@@ -70,11 +71,6 @@ export async function extractTreeDropData(dataTransfer: VSDataTransfer): Promise
 	return editors;
 }
 
-export function convertResourceUrlsToUriList(resourceUrls: string): string {
-	const asJson: URI[] = JSON.parse(resourceUrls);
-	return asJson.map(uri => uri.toString()).join('\n');
-}
-
 export interface IResourcesDropHandlerOptions {
 
 	/**