1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
// Copyright 2014 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.
import 'package:flutter/widgets.dart';
import '../common.dart';
const int _kNumIterations = 1000;
const int _kNumWarmUp = 100;
void main() {
final List<String> words = 'Lorem Ipsum is simply dummy text of the printing and'
" typesetting industry. Lorem Ipsum has been the industry's"
' standard dummy text ever since the 1500s, when an unknown'
' printer took a galley of type and scrambled it to make a'
' type specimen book'.split(' ');
final List<InlineSpanSemanticsInformation> data = <InlineSpanSemanticsInformation>[];
for (int i = 0; i < words.length; i++) {
if (i.isEven) {
data.add(
InlineSpanSemanticsInformation(words[i]),
);
} else if (i.isEven) {
data.add(
InlineSpanSemanticsInformation(words[i], isPlaceholder: true),
);
}
}
print(words);
// Warm up lap
for (int i = 0; i < _kNumWarmUp; i += 1) {
combineSemanticsInfoSyncStar(data);
combineSemanticsInfoList(data);
}
final Stopwatch watch = Stopwatch();
watch.start();
for (int i = 0; i < _kNumIterations; i += 1) {
consumeSpan(combineSemanticsInfoSyncStar(data));
}
final int combineSemanticsInfoSyncStarTime = watch.elapsedMicroseconds;
watch
..reset()
..start();
for (int i = 0; i < _kNumIterations; i += 1) {
consumeSpan(combineSemanticsInfoList(data));
}
final int combineSemanticsInfoListTime = watch.elapsedMicroseconds;
watch
..reset()
..start();
final BenchmarkResultPrinter printer = BenchmarkResultPrinter();
const double scale = 1000.0 / _kNumIterations;
printer.addResult(
description: 'combineSemanticsInfoSyncStar',
value: combineSemanticsInfoSyncStarTime * scale,
unit: 'ns per iteration',
name: 'combineSemanticsInfoSyncStar_iteration',
);
printer.addResult(
description: 'combineSemanticsInfoList',
value: combineSemanticsInfoListTime * scale,
unit: 'ns per iteration',
name: 'combineSemanticsInfoList_iteration',
);
printer.printToStdout();
}
String consumeSpan(Iterable<InlineSpanSemanticsInformation> items) {
String result = '';
for (final InlineSpanSemanticsInformation span in items) {
result += span.text;
}
return result;
}
Iterable<InlineSpanSemanticsInformation> combineSemanticsInfoSyncStar(List<InlineSpanSemanticsInformation> inputs) sync* {
String workingText = '';
String? workingLabel;
for (final InlineSpanSemanticsInformation info in inputs) {
if (info.requiresOwnNode) {
if (workingText != null) {
yield InlineSpanSemanticsInformation(workingText, semanticsLabel: workingLabel ?? workingText);
workingText = '';
workingLabel = null;
}
yield info;
} else {
workingText += info.text;
workingLabel ??= '';
final String? infoSemanticsLabel = info.semanticsLabel;
if (infoSemanticsLabel != null) {
workingLabel += infoSemanticsLabel;
} else {
workingLabel += info.text;
}
}
}
if (workingText != null) {
yield InlineSpanSemanticsInformation(workingText, semanticsLabel: workingLabel);
} else {
assert(workingLabel != null);
}
}
Iterable<InlineSpanSemanticsInformation> combineSemanticsInfoList(List<InlineSpanSemanticsInformation> inputs) {
String workingText = '';
String? workingLabel;
final List<InlineSpanSemanticsInformation> result = <InlineSpanSemanticsInformation>[];
for (final InlineSpanSemanticsInformation info in inputs) {
if (info.requiresOwnNode) {
if (workingText != null) {
result.add(InlineSpanSemanticsInformation(workingText, semanticsLabel: workingLabel ?? workingText));
workingText = '';
workingLabel = null;
}
result.add(info);
} else {
workingText += info.text;
workingLabel ??= '';
final String? infoSemanticsLabel = info.semanticsLabel;
if (infoSemanticsLabel != null) {
workingLabel += infoSemanticsLabel;
} else {
workingLabel += info.text;
}
}
}
if (workingText != null) {
result.add(InlineSpanSemanticsInformation(workingText, semanticsLabel: workingLabel));
} else {
assert(workingLabel != null);
}
return result;
}