| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'package:test/test.dart'; |
| import 'package:source_span/src/utils.dart'; |
| |
| void main() { |
| group('find line start', () { |
| test('skip entries in wrong column', () { |
| final context = '0_bb\n1_bbb\n2b____\n3bbb\n'; |
| final index = findLineStart(context, 'b', 1)!; |
| expect(index, 11); |
| expect(context.substring(index - 1, index + 3), '\n2b_'); |
| }); |
| |
| test('end of line column for empty text', () { |
| final context = '0123\n56789\nabcdefgh\n'; |
| final index = findLineStart(context, '', 5)!; |
| expect(index, 5); |
| expect(context[index], '5'); |
| }); |
| |
| test('column at the end of the file for empty text', () { |
| var context = '0\n2\n45\n'; |
| var index = findLineStart(context, '', 2)!; |
| expect(index, 4); |
| expect(context[index], '4'); |
| |
| context = '0\n2\n45'; |
| index = findLineStart(context, '', 2)!; |
| expect(index, 4); |
| }); |
| |
| test('empty text in empty context', () { |
| final index = findLineStart('', '', 0); |
| expect(index, 0); |
| }); |
| |
| test('found on the first line', () { |
| final context = '0\n2\n45\n'; |
| final index = findLineStart(context, '0', 0); |
| expect(index, 0); |
| }); |
| |
| test('finds text that starts with a newline', () { |
| final context = '0\n2\n45\n'; |
| final index = findLineStart(context, '\n2', 1); |
| expect(index, 0); |
| }); |
| |
| test('not found', () { |
| final context = '0\n2\n45\n'; |
| final index = findLineStart(context, '0', 1); |
| expect(index, isNull); |
| }); |
| }); |
| } |