| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // @dart = 2.10 |
| import 'package:test/bootstrap/browser.dart'; |
| import 'package:test/test.dart'; |
| |
| import 'package:ui/src/engine.dart'; |
| import 'package:ui/ui.dart'; |
| |
| import 'line_breaker_test_data.dart'; |
| |
| void main() { |
| internalBootstrapBrowserTest(() => testMain); |
| } |
| |
| void testMain() { |
| group('nextLineBreak', () { |
| test('Does not go beyond the ends of a string', () { |
| expect(split('foo'), <Line>[ |
| Line('foo', LineBreakType.endOfText), |
| ]); |
| |
| final LineBreakResult result = nextLineBreak('foo', 'foo'.length); |
| expect(result.index, 'foo'.length); |
| expect(result.type, LineBreakType.endOfText); |
| }); |
| |
| test('whitespace', () { |
| expect(split('foo bar'), <Line>[ |
| Line('foo ', LineBreakType.opportunity), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| expect(split(' foo bar '), <Line>[ |
| Line(' ', LineBreakType.opportunity), |
| Line('foo ', LineBreakType.opportunity), |
| Line('bar ', LineBreakType.endOfText), |
| ]); |
| }); |
| |
| test('single-letter lines', () { |
| expect(split('foo a bar'), <Line>[ |
| Line('foo ', LineBreakType.opportunity), |
| Line('a ', LineBreakType.opportunity), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| expect(split('a b c'), <Line>[ |
| Line('a ', LineBreakType.opportunity), |
| Line('b ', LineBreakType.opportunity), |
| Line('c', LineBreakType.endOfText), |
| ]); |
| expect(split(' a b '), <Line>[ |
| Line(' ', LineBreakType.opportunity), |
| Line('a ', LineBreakType.opportunity), |
| Line('b ', LineBreakType.endOfText), |
| ]); |
| }); |
| |
| test('new line characters', () { |
| final String bk = String.fromCharCode(0x000B); |
| // Can't have a line break between CR×LF. |
| expect(split('foo\r\nbar'), <Line>[ |
| Line('foo\r\n', LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| |
| // Any other new line is considered a line break on its own. |
| |
| expect(split('foo\n\nbar'), <Line>[ |
| Line('foo\n', LineBreakType.mandatory), |
| Line('\n', LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| expect(split('foo\r\rbar'), <Line>[ |
| Line('foo\r', LineBreakType.mandatory), |
| Line('\r', LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| expect(split('foo$bk${bk}bar'), <Line>[ |
| Line('foo$bk', LineBreakType.mandatory), |
| Line(bk, LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| |
| expect(split('foo\n\rbar'), <Line>[ |
| Line('foo\n', LineBreakType.mandatory), |
| Line('\r', LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| expect(split('foo$bk\rbar'), <Line>[ |
| Line('foo$bk', LineBreakType.mandatory), |
| Line('\r', LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| expect(split('foo\r${bk}bar'), <Line>[ |
| Line('foo\r', LineBreakType.mandatory), |
| Line(bk, LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| expect(split('foo$bk\nbar'), <Line>[ |
| Line('foo$bk', LineBreakType.mandatory), |
| Line('\n', LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| expect(split('foo\n${bk}bar'), <Line>[ |
| Line('foo\n', LineBreakType.mandatory), |
| Line(bk, LineBreakType.mandatory), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| |
| // New lines at the beginning and end. |
| |
| expect(split('foo\n'), <Line>[ |
| Line('foo\n', LineBreakType.mandatory), |
| Line('', LineBreakType.endOfText), |
| ]); |
| expect(split('foo\r'), <Line>[ |
| Line('foo\r', LineBreakType.mandatory), |
| Line('', LineBreakType.endOfText), |
| ]); |
| expect(split('foo$bk'), <Line>[ |
| Line('foo$bk', LineBreakType.mandatory), |
| Line('', LineBreakType.endOfText), |
| ]); |
| |
| expect(split('\nfoo'), <Line>[ |
| Line('\n', LineBreakType.mandatory), |
| Line('foo', LineBreakType.endOfText), |
| ]); |
| expect(split('\rfoo'), <Line>[ |
| Line('\r', LineBreakType.mandatory), |
| Line('foo', LineBreakType.endOfText), |
| ]); |
| expect(split('${bk}foo'), <Line>[ |
| Line(bk, LineBreakType.mandatory), |
| Line('foo', LineBreakType.endOfText), |
| ]); |
| |
| // Whitespace with new lines. |
| |
| expect(split('foo \n'), <Line>[ |
| Line('foo \n', LineBreakType.mandatory), |
| Line('', LineBreakType.endOfText), |
| ]); |
| |
| expect(split('foo \n '), <Line>[ |
| Line('foo \n', LineBreakType.mandatory), |
| Line(' ', LineBreakType.endOfText), |
| ]); |
| |
| expect(split('foo \n bar'), <Line>[ |
| Line('foo \n', LineBreakType.mandatory), |
| Line(' ', LineBreakType.opportunity), |
| Line('bar', LineBreakType.endOfText), |
| ]); |
| |
| expect(split('\n foo'), <Line>[ |
| Line('\n', LineBreakType.mandatory), |
| Line(' ', LineBreakType.opportunity), |
| Line('foo', LineBreakType.endOfText), |
| ]); |
| expect(split(' \n foo'), <Line>[ |
| Line(' \n', LineBreakType.mandatory), |
| Line(' ', LineBreakType.opportunity), |
| Line('foo', LineBreakType.endOfText), |
| ]); |
| }); |
| |
| test('trailing spaces and new lines', () { |
| expect( |
| findBreaks('foo bar '), |
| <LineBreakResult>[ |
| LineBreakResult(4, 4, 3, LineBreakType.opportunity), |
| LineBreakResult(9, 9, 7, LineBreakType.endOfText), |
| ], |
| ); |
| |
| expect( |
| findBreaks('foo \nbar\nbaz \n'), |
| <LineBreakResult>[ |
| LineBreakResult(6, 5, 3, LineBreakType.mandatory), |
| LineBreakResult(10, 9, 9, LineBreakType.mandatory), |
| LineBreakResult(17, 16, 13, LineBreakType.mandatory), |
| LineBreakResult(17, 17, 17, LineBreakType.endOfText), |
| ], |
| ); |
| }); |
| |
| test('leading spaces', () { |
| expect( |
| findBreaks(' foo'), |
| <LineBreakResult>[ |
| LineBreakResult(1, 1, 0, LineBreakType.opportunity), |
| LineBreakResult(4, 4, 4, LineBreakType.endOfText), |
| ], |
| ); |
| |
| expect( |
| findBreaks(' foo'), |
| <LineBreakResult>[ |
| LineBreakResult(3, 3, 0, LineBreakType.opportunity), |
| LineBreakResult(6, 6, 6, LineBreakType.endOfText), |
| ], |
| ); |
| |
| expect( |
| findBreaks(' foo bar'), |
| <LineBreakResult>[ |
| LineBreakResult(2, 2, 0, LineBreakType.opportunity), |
| LineBreakResult(8, 8, 5, LineBreakType.opportunity), |
| LineBreakResult(11, 11, 11, LineBreakType.endOfText), |
| ], |
| ); |
| |
| expect( |
| findBreaks(' \n foo'), |
| <LineBreakResult>[ |
| LineBreakResult(3, 2, 0, LineBreakType.mandatory), |
| LineBreakResult(6, 6, 3, LineBreakType.opportunity), |
| LineBreakResult(9, 9, 9, LineBreakType.endOfText), |
| ], |
| ); |
| }); |
| |
| test('comprehensive test', () { |
| for (int t = 0; t < data.length; t++) { |
| final TestCase testCase = data[t]; |
| final String text = testCase.toText(); |
| |
| int lastLineBreak = 0; |
| int surrogateCount = 0; |
| // `s` is the index in the `testCase.signs` list. |
| for (int s = 0; s < testCase.signs.length; s++) { |
| // `i` is the index in the `text`. |
| final int i = s + surrogateCount; |
| if (s < testCase.chars.length && testCase.chars[s].isSurrogatePair) { |
| surrogateCount++; |
| } |
| |
| final Sign sign = testCase.signs[s]; |
| final LineBreakResult result = nextLineBreak(text, lastLineBreak); |
| if (sign.isBreakOpportunity) { |
| // The line break should've been found at index `i`. |
| expect( |
| result.index, |
| i, |
| reason: 'Failed at test case number $t:\n' |
| '${testCase.toString()}\n' |
| '"$text"\n' |
| '\nExpected line break at {$lastLineBreak - $i} but found line break at {$lastLineBreak - ${result.index}}.', |
| ); |
| lastLineBreak = i; |
| } else { |
| // This isn't a line break opportunity so the line break should be |
| // somewhere after index `i`. |
| expect( |
| result.index, |
| greaterThan(i), |
| reason: 'Failed at test case number $t:\n' |
| '${testCase.toString()}\n' |
| '"$text"\n' |
| '\nUnexpected line break found at {$lastLineBreak - $i}.', |
| ); |
| } |
| } |
| } |
| }); |
| }); |
| } |
| |
| /// Holds information about how a line was split from a string. |
| class Line { |
| Line(this.text, this.breakType); |
| |
| final String text; |
| final LineBreakType breakType; |
| |
| @override |
| int get hashCode => hashValues(text, breakType); |
| |
| @override |
| bool operator ==(Object other) { |
| return other is Line && other.text == text && other.breakType == breakType; |
| } |
| |
| String get escapedText { |
| final String bk = String.fromCharCode(0x000B); |
| final String nl = String.fromCharCode(0x0085); |
| return text |
| .replaceAll('"', '\\"') |
| .replaceAll('\n', '\\n') |
| .replaceAll('\r', '\\r') |
| .replaceAll(bk, '{BK}') |
| .replaceAll(nl, '{NL}'); |
| } |
| |
| @override |
| String toString() { |
| return '"$escapedText" ($breakType)'; |
| } |
| } |
| |
| List<Line> split(String text) { |
| final List<Line> lines = <Line>[]; |
| |
| int lastIndex = 0; |
| for (LineBreakResult brk in findBreaks(text)) { |
| lines.add(Line(text.substring(lastIndex, brk.index), brk.type)); |
| lastIndex = brk.index; |
| } |
| return lines; |
| } |
| |
| List<LineBreakResult> findBreaks(String text) { |
| final List<LineBreakResult> breaks = <LineBreakResult>[]; |
| |
| LineBreakResult brk = nextLineBreak(text, 0); |
| breaks.add(brk); |
| while (brk.type != LineBreakType.endOfText) { |
| brk = nextLineBreak(text, brk.index); |
| breaks.add(brk); |
| } |
| return breaks; |
| } |