Fixes #3894: findPrevBracketInToken reported incorrect range for bracket match

src/vs/editor/common/modes/supports/richEditBrackets.ts

@@ -121,11 +121,11 @@ export class BracketsUtils {
 			return null;
 		}
 
-		let matchOffset = reversedText.length - 1 - m.index;
+		let matchOffset = reversedText.length - m.index;
 		let matchLength = m[0].length;
 		let absoluteMatchOffset = offset + matchOffset;
 
-		return new Range(lineNumber, absoluteMatchOffset + 1, lineNumber, absoluteMatchOffset + 1 + matchLength);
+		return new Range(lineNumber, absoluteMatchOffset - matchLength + 1, lineNumber, absoluteMatchOffset + 1);
 	}
 
 	public static findPrevBracketInToken(reversedBracketRegex:RegExp, lineNumber:number, lineText:string, currentTokenStart:number, currentTokenEnd:number): Range {

src/vs/editor/test/common/modes/supports/richEditBrackets.test.ts

+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import * as assert from 'assert';
+import {BracketsUtils} from 'vs/editor/common/modes/supports/richEditBrackets';
+import {IEditorRange} from 'vs/editor/common/editorCommon';
+
+suite('richEditBrackets', () => {
+
+	function findPrevBracketInToken(reversedBracketRegex:RegExp, lineText:string, currentTokenStart:number, currentTokenEnd:number): IEditorRange {
+		return BracketsUtils.findPrevBracketInToken(reversedBracketRegex, 1, lineText, currentTokenStart, currentTokenEnd);
+	}
+
+	function findNextBracketInToken(forwardBracketRegex:RegExp, lineText:string, currentTokenStart:number, currentTokenEnd:number): IEditorRange {
+		return BracketsUtils.findNextBracketInToken(forwardBracketRegex, 1, lineText, currentTokenStart, currentTokenEnd);
+	}
+
+	test('findPrevBracketInToken one char 1', () => {
+		let result = findPrevBracketInToken(/(\{)|(\})/i, '{', 0, 1);
+		assert.equal(result.startColumn, 1);
+		assert.equal(result.endColumn, 2);
+	});
+
+	test('findPrevBracketInToken one char 2', () => {
+		let result = findPrevBracketInToken(/(\{)|(\})/i, '{{', 0, 1);
+		assert.equal(result.startColumn, 1);
+		assert.equal(result.endColumn, 2);
+	});
+
+	test('findPrevBracketInToken one char 3', () => {
+		let result = findPrevBracketInToken(/(\{)|(\})/i, '{hello world!', 0, 13);
+		assert.equal(result.startColumn, 1);
+		assert.equal(result.endColumn, 2);
+	});
+
+	test('findPrevBracketInToken more chars 1', () => {
+		let result = findPrevBracketInToken(/(olleh)/i, 'hello world!', 0, 12);
+		assert.equal(result.startColumn, 1);
+		assert.equal(result.endColumn, 6);
+	});
+
+	test('findPrevBracketInToken more chars 2', () => {
+		let result = findPrevBracketInToken(/(olleh)/i, 'hello world!', 0, 5);
+		assert.equal(result.startColumn, 1);
+		assert.equal(result.endColumn, 6);
+	});
+
+	test('findPrevBracketInToken more chars 3', () => {
+		let result = findPrevBracketInToken(/(olleh)/i, ' hello world!', 0, 6);
+		assert.equal(result.startColumn, 2);
+		assert.equal(result.endColumn, 7);
+	});
+
+	test('findNextBracketInToken one char', () => {
+		let result = findNextBracketInToken(/(\{)|(\})/i, '{', 0, 1);
+		assert.equal(result.startColumn, 1);
+		assert.equal(result.endColumn, 2);
+	});
+
+	test('findNextBracketInToken more chars', () => {
+		let result = findNextBracketInToken(/(world)/i, 'hello world!', 0, 12);
+		assert.equal(result.startColumn, 7);
+		assert.equal(result.endColumn, 12);
+	});
+
+	test('issue #3894: [Handlebars] Curly braces edit issues', () => {
+		let result = findPrevBracketInToken(/(\-\-!<)|(>\-\-)|(\{\{)|(\}\})/i, '{{asd}}', 0, 2);
+		assert.equal(result.startColumn, 1);
+		assert.equal(result.endColumn, 3);
+	});
+
+});
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