Initial commit for builtin emmet extension #21943

extensions/emmet/src/editPoint.ts

@@ -0,0 +1,70 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import { validate } from './util';
+
+export function fetchEditPoint(direction: string): void {
+	let editor = vscode.window.activeTextEditor;
+	if (!validate()) {
+		return;
+	}
+
+	let newSelections: vscode.Selection[] = [];
+	editor.selections.forEach(selection => {
+		let updatedSelection = direction === 'next' ? nextEditPoint(selection.anchor, editor) : prevEditPoint(selection.anchor, editor);
+		newSelections.push(updatedSelection);
+	});
+	editor.selections = newSelections;
+}
+
+function nextEditPoint(position: vscode.Position, editor: vscode.TextEditor): vscode.Selection {
+	for (let lineNum = position.line; lineNum < editor.document.lineCount; lineNum++) {
+		let updatedSelection = findEditPoint(lineNum, editor, position, 'next');
+		if (updatedSelection) {
+			return updatedSelection;
+		}
+	}
+}
+
+function prevEditPoint(position: vscode.Position, editor: vscode.TextEditor): vscode.Selection {
+	for (let lineNum = position.line; lineNum >= 0; lineNum--) {
+		let updatedSelection = findEditPoint(lineNum, editor, position, 'prev');
+		if (updatedSelection) {
+			return updatedSelection;
+		}
+	}
+}
+
+
+function findEditPoint(lineNum: number, editor: vscode.TextEditor, position: vscode.Position, direction: string): vscode.Selection {
+	let line = editor.document.lineAt(lineNum);
+
+	if (lineNum !== position.line && line.isEmptyOrWhitespace) {
+		editor.selection = new vscode.Selection(lineNum, 0, lineNum, 0);
+		return;
+	}
+
+	let lineContent = line.text;
+	if (lineNum === position.line && direction === 'prev') {
+		lineContent = lineContent.substr(0, position.character);
+	}
+	let emptyAttrIndex = direction === 'next' ? lineContent.indexOf('""', lineNum === position.line ? position.character : 0) : lineContent.lastIndexOf('""');
+	let emptyTagIndex = direction === 'next' ? lineContent.indexOf('><', lineNum === position.line ? position.character : 0) : lineContent.lastIndexOf('><');
+
+	let winner = -1;
+
+	if (emptyAttrIndex > -1 && emptyTagIndex > -1) {
+		winner = direction === 'next' ? Math.min(emptyAttrIndex, emptyTagIndex) : Math.max(emptyAttrIndex, emptyTagIndex);
+	} else if (emptyAttrIndex > -1) {
+		winner = emptyAttrIndex;
+	} else {
+		winner = emptyTagIndex;
+	}
+
+	if (winner > -1) {
+		return new vscode.Selection(lineNum, winner + 1, lineNum, winner + 1);
+	}
+}