blob: 2d09a390fea0b14a81164ceef9ed8b30d0bcbd43 [file] [log] [blame]
// Copyright (c) 2018, 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.
// See http://dartbug.com/33660 for details about what inspired this generator.
import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'dart:math';
Random random = new Random();
int totalNodes = 0;
Set<String> seen = new Set<String>();
main(List<String> args) async {
int maxSize;
if (args.length > 0) maxSize = int.tryParse(args[0]);
maxSize ??= 5;
for (int i = 0; i < 2500; i++) {
stdout.write(".");
if (i % 75 == 74) stdout.write("\n");
totalNodes = 0;
Tree tree = fuzz(1 + random.nextInt(5), 1 + random.nextInt(8), maxSize);
String expected =
new List<String>.generate(totalNodes, (i) => "${i + 1}").join(" ");
String asyncProgram = printProgram(tree, true, false, true, '"$expected"');
if (seen.add(asyncProgram)) {
File asyncFile = new File('${maxSize}_${i}.dart')
..writeAsStringSync(asyncProgram);
List<String> run = await executeAndGetStdOut(
Platform.executable, <String>[asyncFile.path]);
if (expected == run[0]) {
asyncFile.deleteSync();
} else {
print("\n${asyncFile.path} was not as expected!");
String name = "async_nested_${maxSize}_${i}_test.dart";
asyncFile.renameSync(name);
print(" -> Created $name");
print(" (you might want to run dartfmt -w $name).");
}
}
}
print(" done ");
}
Tree fuzz(int asyncLikely, int childrenLikely, int maxSize) {
// asyncLikely = 3;
// childrenLikely = 5;
totalNodes++;
Tree result = new Tree();
result.name = "$totalNodes";
result.async = random.nextInt(10) < asyncLikely;
while (random.nextInt(10) < childrenLikely) {
if (totalNodes >= maxSize) return result;
result.children
.add(fuzz(1 + random.nextInt(5), 1 + random.nextInt(8), maxSize));
}
return result;
}
String printProgram(Tree tree, bool emitAsync, bool emitPrintOnCreate,
bool printSimple, String expected) {
StringBuffer lines = new StringBuffer();
lines.write("""
// Copyright (c) 2018, 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.
// This has been automatically generated by script
// "async_nested_test_generator.dart".
import 'dart:async';
void main() async {
""");
printNode(Tree node) {
if (node.async && emitAsync) {
lines.write("await new Future.value(");
}
lines.writeln("new Node('${node.name}', [");
for (Tree child in node.children) {
printNode(child);
lines.write(",");
}
lines.writeln("])");
if (node.async && emitAsync) {
lines.write(")");
}
}
if (expected != null) {
lines.writeln('String expected = $expected;');
}
lines.write("Node node = ");
printNode(tree);
lines.writeln(";");
if (printSimple) {
lines.writeln("String actual = node.toSimpleString();");
} else {
lines.writeln("String actual = node.toString();");
}
lines.writeln("print(actual);");
if (expected != null) {
lines.writeln(r"""if (actual != expected) {
throw "Expected '$expected' but got '$actual'";
}""");
}
lines.writeln(r"""
}
class Node {
final List<Node> nested;
final String name;
Node(this.name, [this.nested]) {
""");
if (emitPrintOnCreate) {
lines.writeln(r'print("Creating $name");');
}
lines.write(r"""
}
String toString() => '<$name:[${nested?.join(', ')}]>';
toSimpleString() {
var tmp = nested?.map((child) => child.toSimpleString());
return '$name ${tmp?.join(' ')}'.trim();
}
}
""");
return lines.toString();
}
Future<List<String>> executeAndGetStdOut(
String executable, List<String> arguments) async {
var process = await Process.start(executable, arguments);
Future<List<String>> result = combine(
process.stdout
.transform(utf8.decoder)
.transform(const LineSplitter())
.toList(),
process.stderr
.transform(utf8.decoder)
.transform(const LineSplitter())
.toList());
int exitCode = await process.exitCode;
(await result).add("Exit code: $exitCode");
return result;
}
Future<List<String>> combine(
Future<List<String>> a, Future<List<String>> b) async {
List<String> aDone = await a;
List<String> bDone = await b;
List<String> result = new List.from(aDone);
result.addAll(bDone);
return result;
}
class Tree {
String name;
bool async = false;
List<Tree> children = <Tree>[];
}