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// 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.
// @dart = 2.9
library line_splitter_test;
import "package:expect/expect.dart";
import 'dart:async';
import 'dart:convert';
import 'dart:math' as MATH;
const lineTerminators = const ['\n', '\r', '\r\n'];
void main() {
testSimpleConvert();
testSplit();
testSplitWithOffsets();
testManyLines();
testReadLine1();
testReadLine2();
testChunkedConversion();
}
void testManyLines() {
int breakIndex = 0;
var inputs = const ['line1', 'line2', 'long line 3', ' line 4 ', 'l5'];
var buffer = inputs.fold(new StringBuffer(), (buff, e) {
buff.write(e);
buff.write(lineTerminators[breakIndex]);
breakIndex++;
breakIndex = breakIndex % lineTerminators.length;
return buff;
});
var foo = _getLinesSliced(buffer.toString());
Expect.equals(inputs.join(), foo);
}
String _getLinesSliced(String str) {
String lines;
var stringSink =
new StringConversionSink.withCallback((result) => lines = result);
var sink = new LineSplitter().startChunkedConversion(stringSink);
const chunkSize = 3;
var index = 0;
while (index < str.length) {
var end = MATH.min(str.length, index + chunkSize);
sink.addSlice(str, index, end, false);
index += chunkSize;
}
sink.close();
return lines;
}
void testSimpleConvert() {
var decoder = new LineSplitter();
for (var lf in lineTerminators) {
var test = "line1${lf}line2${lf}line3";
var result = decoder.convert(test);
Expect.listEquals(['line1', 'line2', 'line3'], result);
}
var test = "Line1\nLine2\r\nLine3\rLine4\n\n\n\r\n\r\n\r\r";
var result = decoder.convert(test);
Expect.listEquals(
['Line1', 'Line2', 'Line3', 'Line4', '', '', '', '', '', ''], result);
}
void testReadLine1() {
var controller = new StreamController<List<int>>(sync: true);
var stream =
controller.stream.transform(utf8.decoder).transform(const LineSplitter());
var stage = 0;
var done = false;
void stringData(line) {
Expect.equals(stage, 0);
Expect.equals("Line", line);
stage++;
}
void streamClosed() {
Expect.equals(1, stage);
done = true;
}
stream.listen(stringData, onDone: streamClosed);
// Note: codeUnits is fine. Text is ASCII.
controller.add("Line".codeUnits);
controller.close();
Expect.isTrue(done, 'should be done by now');
}
void testReadLine2() {
var controller = new StreamController<List<int>>(sync: true);
var stream =
controller.stream.transform(utf8.decoder).transform(const LineSplitter());
var expectedLines = [
'Line1',
'Line2',
'Line3',
'Line4',
'',
'',
'',
'',
'',
'',
'Line5',
'Line6'
];
var index = 0;
stream.listen((line) {
Expect.equals(expectedLines[index++], line);
});
// Note: codeUnits is fine. Text is ASCII.
controller.add("Line1\nLine2\r\nLine3\rLi".codeUnits);
controller.add("ne4\n".codeUnits);
controller.add("\n\n\r\n\r\n\r\r".codeUnits);
controller.add("Line5\r".codeUnits);
controller.add("\nLine6\n".codeUnits);
controller.close();
Expect.equals(expectedLines.length, index);
}
void testSplit() {
for (var lf in lineTerminators) {
var test = "line1${lf}line2${lf}line3";
var result = LineSplitter.split(test).toList();
Expect.listEquals(['line1', 'line2', 'line3'], result);
}
var test = "Line1\nLine2\r\nLine3\rLine4\n\n\n\r\n\r\n\r\r";
var result = LineSplitter.split(test).toList();
Expect.listEquals(
['Line1', 'Line2', 'Line3', 'Line4', '', '', '', '', '', ''], result);
}
void testSplitWithOffsets() {
for (var lf in lineTerminators) {
var test = "line1${lf}line2${lf}line3";
var i2 = 5 + lf.length; // index of "line2".
Expect.equals(5 + lf.length, i2);
var result = LineSplitter.split(test, 4).toList();
Expect.listEquals(['1', 'line2', 'line3'], result);
result = LineSplitter.split(test, 5).toList();
Expect.listEquals(['', 'line2', 'line3'], result);
result = LineSplitter.split(test, i2).toList();
Expect.listEquals(['line2', 'line3'], result);
result = LineSplitter.split(test, 0, i2 + 2).toList();
Expect.listEquals(['line1', 'li'], result);
result = LineSplitter.split(test, i2, i2 + 5).toList();
Expect.listEquals(['line2'], result);
}
var test = "Line1\nLine2\r\nLine3\rLine4\n\n\n\r\n\r\n\r\r";
var result = LineSplitter.split(test).toList();
Expect.listEquals(
['Line1', 'Line2', 'Line3', 'Line4', '', '', '', '', '', ''], result);
test = "a\n\nb\r\nc\n\rd\r\re\r\n\nf\r\n";
result = LineSplitter.split(test).toList();
Expect.listEquals(["a", "", "b", "c", "", "d", "", "e", "", "f"], result);
}
void testChunkedConversion() {
// Test any split of this complex string.
var test = "a\n\nb\r\nc\n\rd\r\re\r\n\nf\rg\nh\r\n";
var result = ["a", "", "b", "c", "", "d", "", "e", "", "f", "g", "h"];
for (int i = 0; i < test.length; i++) {
var output = [];
var splitter = new LineSplitter();
var outSink = new ChunkedConversionSink<String>.withCallback(output.addAll);
var sink = splitter.startChunkedConversion(outSink);
sink.addSlice(test, 0, i, false);
sink.addSlice(test, i, test.length, false);
sink.close();
Expect.listEquals(result, output);
}
// Test the string split into three parts in any way.
for (int i = 0; i < test.length; i++) {
for (int j = i; j < test.length; j++) {
var output = [];
var splitter = new LineSplitter();
var outSink =
new ChunkedConversionSink<String>.withCallback(output.addAll);
var sink = splitter.startChunkedConversion(outSink);
sink.addSlice(test, 0, i, false);
sink.addSlice(test, i, j, false);
sink.addSlice(test, j, test.length, true);
Expect.listEquals(result, output);
}
}
}