Dan Rubel
4a27605fdc
Change-Id: I9430d95c012b752bc4ca0530d79252b8b032a26b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/104841 Reviewed-by: Kevin Millikin <kmillikin@google.com> Commit-Queue: Dan Rubel <danrubel@google.com> Auto-Submit: Dan Rubel <danrubel@google.com>
106 lines
2.9 KiB
Dart
106 lines
2.9 KiB
Dart
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:async';
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import 'dart:io';
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import 'dart:isolate';
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import 'package:yaml/yaml.dart' show YamlMap, loadYaml;
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import 'package:dart_style/dart_style.dart' show DartFormatter;
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import '../../lib/src/fasta/scanner/characters.dart' show $A, $MINUS, $a, $z;
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main(List<String> arguments) async {
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var port = new ReceivePort();
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await new File.fromUri(await computeGeneratedFile())
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.writeAsString(await generateMessagesFile(), flush: true);
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port.close();
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}
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Future<Uri> computeGeneratedFile() {
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return Isolate.resolvePackageUri(
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Uri.parse('package:front_end/src/api_prototype/experimental_flags.dart'));
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}
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Future<String> generateMessagesFile() async {
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Uri messagesFile =
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Platform.script.resolve("../../../../tools/experimental_features.yaml");
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Map<dynamic, dynamic> yaml =
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loadYaml(await new File.fromUri(messagesFile).readAsStringSync());
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StringBuffer sb = new StringBuffer();
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sb.write('''
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// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// NOTE: THIS FILE IS GENERATED. DO NOT EDIT.
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//
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// Instead modify 'tools/experimental_features.yaml' and run
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// 'pkg/front_end/tool/fasta generate-experimental-flags' to update.
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''');
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List<String> keys = yaml.keys.cast<String>().toList()..sort();
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sb.write('''
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enum ExperimentalFlag {
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''');
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for (var key in keys) {
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sb.writeln(' ${keyToIdentifier(key)},');
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}
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sb.writeln('}');
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sb.write('''
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ExperimentalFlag parseExperimentalFlag(String flag) {
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switch (flag) {
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''');
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for (var key in keys) {
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sb.writeln(' case "$key":');
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sb.writeln(' return ExperimentalFlag.${keyToIdentifier(key)};');
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}
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sb.write(''' }
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return null;
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}
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''');
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sb.write('''
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const Map<ExperimentalFlag, bool> defaultExperimentalFlags = {
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''');
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for (var key in keys) {
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bool shipped = (yaml[key] as YamlMap)['enabledIn'] != null;
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sb.writeln(' ExperimentalFlag.${keyToIdentifier(key)}: ${shipped},');
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if (shipped) {
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var expired = (yaml[key] as YamlMap)['expired'];
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if (expired == false) {
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throw 'Cannot mark shipped feature as "expired: false"';
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}
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}
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}
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sb.writeln('};');
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return new DartFormatter().format("$sb");
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}
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keyToIdentifier(String key) {
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var identifier = StringBuffer();
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for (int index = 0; index < key.length; ++index) {
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var code = key.codeUnitAt(index);
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if (code == $MINUS) {
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++index;
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code = key.codeUnitAt(index);
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if ($a <= code && code <= $z) {
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code = code - $a + $A;
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}
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}
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identifier.writeCharCode(code);
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}
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return identifier.toString();
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}
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