blob: 5b4057991f484d59f500fb414a7b41ad50cd49ad [file] [log] [blame]
// 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.
/// A library for compiling Dart code and manipulating analyzer parse trees.
import 'dart:async';
import 'dart:io';
import 'package:analyzer/dart/analysis/analysis_context.dart';
import 'package:analyzer/file_system/overlay_file_system.dart';
import 'package:analyzer/file_system/physical_file_system.dart';
import 'package:analyzer/dart/analysis/context_builder.dart';
import 'package:analyzer/dart/analysis/context_locator.dart';
import 'package:analyzer/dart/analysis/session.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/error/error.dart';
import 'package:cli_util/cli_util.dart';
import 'package:path/path.dart' as p;
import 'exceptions.dart';
import 'io.dart';
import 'log.dart' as log;
/// Returns whether [dart] looks like an entrypoint file.
bool isEntrypoint(CompilationUnit dart) {
// Allow two or fewer arguments so that entrypoints intended for use with
// [spawnUri] get counted.
// TODO(nweiz): this misses the case where a Dart file doesn't contain main(),
// but it parts in another file that does.
return dart.declarations.any((node) {
return node is FunctionDeclaration && == 'main' &&
node.functionExpression.parameters.parameters.length <= 2;
/// Snapshots the Dart executable at [executablePath] to a snapshot at
/// [snapshotPath].
/// If [packagesFile] is passed, it's used to resolve `package:` URIs in the
/// executable. Otherwise, a `packages/` directory or a package spec is inferred
/// from the executable's location.
/// If [name] is passed, it is used to describe the executable in logs and error
/// messages.
Future snapshot(
String executablePath,
String snapshotPath, {
Uri packagesFile,
String name,
}) async {
name = log.bold(name ?? executablePath.toString());
var args = ['--snapshot=$snapshotPath', p.toUri(executablePath).toString()];
if (packagesFile != null) {
// Resolve [packagesFile] in case it's relative to work around sdk#33177.
args.insert(0, '--packages=${Uri.base.resolveUri(packagesFile)}');
var result = await runProcess(Platform.executable, args);
if (result.success) {
log.message('Precompiled $name.');
} else {
// Don't leave partial results.
throw ApplicationException(
log.yellow('Failed to precompile $name:\n') + result.stderr.join('\n'));
class AnalysisContextManager {
/// The map from a context root directory to to the context.
final Map<String, AnalysisContext> _contexts = {};
/// Ensure that there are analysis contexts for the directory with the
/// given [path]. If any previously added root covers the [path], keep
/// the previously created analysis context.
/// This method does not discover analysis roots "up", it only looks down
/// the given [path]. It is expected that the client knows analysis roots
/// in advance. Pub does know, it is the packages it works with.
void createContextsForDirectory(String path) {
path = p.normalize(p.absolute(path));
// We add all contexts below the given directory.
// So, children contexts must also have been added.
if (_contexts.containsKey(path)) {
// Overwrite the analysis_options.yaml to avoid loading the file included
// in the package, as this may result in some files not being analyzed.
final resourceProvider =
p.join(path, 'analysis_options.yaml'),
content: '',
modificationStamp: 0,
// Add new contexts for the given path.
var contextLocator = ContextLocator(resourceProvider: resourceProvider);
var roots = contextLocator.locateRoots(includedPaths: [path]);
for (var root in roots) {
var contextRootPath = root.root.path;
// If there is already a context for this context root path, keep it.
if (_contexts.containsKey(contextRootPath)) {
var contextBuilder = ContextBuilder();
var context = contextBuilder.createContext(
contextRoot: root, sdkPath: getSdkPath());
_contexts[contextRootPath] = context;
/// Parse the file with the given [path] into AST.
/// One of the containing directories must be used to create analysis
/// contexts using [createContextsForDirectory]. Throws [StateError] if
/// this has not been done.
/// Throws [AnalyzerErrorGroup] is the file has parsing errors.
CompilationUnit parse(String path) {
path = p.normalize(p.absolute(path));
var parseResult = _getExistingSession(path).getParsedUnit(path);
if (parseResult.errors.isNotEmpty) {
throw AnalyzerErrorGroup(parseResult.errors);
return parseResult.unit;
/// Return import and export directives in the file with the given [path].
/// One of the containing directories must be used to create analysis
/// contexts using [createContextsForDirectory]. Throws [StateError] if
/// this has not been done.
/// Throws [AnalyzerErrorGroup] is the file has parsing errors.
List<UriBasedDirective> parseImportsAndExports(String path) {
var unit = parse(path);
var uriDirectives = <UriBasedDirective>[];
for (var directive in unit.directives) {
if (directive is UriBasedDirective) {
return uriDirectives;
AnalysisSession _getExistingSession(String path) {
for (var context in _contexts.values) {
if (context.contextRoot.isAnalyzed(path)) {
return context.currentSession;
throw StateError('Unable to find the context to $path');
/// An error class that contains multiple [AnalysisError]s.
class AnalyzerErrorGroup implements Exception {
final List<AnalysisError> errors;
String get message => toString();
String toString() => errors.join('\n');