blob: 5a1546c47251e17b7678883003e204d70666bc98 [file] [log] [blame]
// Copyright (c) 2015, 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.
import 'dart:convert';
import 'dart:io';
import 'dart:isolate';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:source_span/source_span.dart';
import '../util/package_config.dart';
import 'string_literal_iterator.dart';
/// Runs [code] in an isolate.
/// [code] should be the contents of a Dart entrypoint. It may contain imports;
/// they will be resolved in the same context as the host isolate. [message] is
/// passed to the [main] method of the code being run; the caller is responsible
/// for using this to establish communication with the isolate.
Future<Isolate> runInIsolate(String code, Object message,
{SendPort? onExit}) async =>
Uri.dataFromString(code, mimeType: 'application/dart', encoding: utf8),
packageConfig: await packageConfigUri,
checked: true,
onExit: onExit);
/// Takes a span whose source is the value of a string that has been parsed from
/// a Dart file and returns the corresponding span from within that Dart file.
/// For example, suppose a Dart file contains `@Eval("1 + a")`. The
/// [StringLiteral] `"1 + a"` is extracted; this is [context]. Its contents are
/// then parsed, producing an error pointing to [span]:
/// line 1, column 5:
/// 1 + a
/// ^
/// This span isn't very useful, since it only shows the location within the
/// [StringLiteral]'s value. So it's passed to [contextualizeSpan] along with
/// [context] and [file] (which contains the source of the entire Dart file),
/// which then returns:
/// line 4, column 12 of file.dart:
/// @Eval("1 + a")
/// ^
/// This properly handles multiline literals, adjacent literals, and literals
/// containing escape sequences. It does not support interpolated literals.
/// This will return `null` if [context] contains an invalid string or does not
/// contain [span].
SourceSpan? contextualizeSpan(
SourceSpan span, StringLiteral context, SourceFile file) {
var contextRunes = StringLiteralIterator(context)..moveNext();
for (var i = 0; i < span.start.offset; i++) {
if (!contextRunes.moveNext()) return null;
var start = contextRunes.offset;
for (var spanRune in span.text.runes) {
if (spanRune != contextRunes.current) return null;
return file.span(start, contextRunes.offset);
/// Parses and returns the currently enabled experiments from
/// [Platform.executableArguments].
final List<String> enabledExperiments = () {
var experiments = <String>[];
var itr = Platform.executableArguments.iterator;
while (itr.moveNext()) {
var arg = itr.current;
if (arg == '--enable-experiment') {
if (!itr.moveNext()) break;
} else if (arg.startsWith('--enable-experiment=')) {
var parts = arg.split('=');
if (parts.length == 2) {
return experiments;