Add observatory_pub_packages snapshot to third_party

observatory_pub_packages/analyzer/analyzer.dart

+// 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.
+
+library analyzer;
+
+import 'dart:io';
+
+import 'package:path/path.dart' as pathos;
+
+import 'src/error.dart';
+import 'src/generated/ast.dart';
+import 'src/generated/error.dart';
+import 'src/generated/parser.dart';
+import 'src/generated/scanner.dart';
+import 'src/generated/source_io.dart';
+import 'src/string_source.dart';
+
+export 'src/error.dart';
+export 'src/generated/ast.dart';
+export 'src/generated/error.dart';
+export 'src/generated/utilities_dart.dart';
+
+/// Parses a Dart file into an AST.
+CompilationUnit parseDartFile(String path) {
+  String contents = new File(path).readAsStringSync();
+  var errorCollector = new _ErrorCollector();
+  var sourceFactory = new SourceFactory([new FileUriResolver()]);
+
+  var absolutePath = pathos.absolute(path);
+  var source = sourceFactory.forUri(pathos.toUri(absolutePath).toString());
+  if (source == null) {
+    throw new ArgumentError("Can't get source for path $path");
+  }
+  if (!source.exists()) {
+    throw new ArgumentError("Source $source doesn't exist");
+  }
+
+  var reader = new CharSequenceReader(contents);
+  var scanner = new Scanner(source, reader, errorCollector);
+  var token = scanner.tokenize();
+  var parser = new Parser(source, errorCollector);
+  var unit = parser.parseCompilationUnit(token);
+  unit.lineInfo = new LineInfo(scanner.lineStarts);
+
+  if (errorCollector.hasErrors) throw errorCollector.group;
+
+  return unit;
+}
+
+/// Parses a string of Dart code into an AST.
+///
+/// If [name] is passed, it's used in error messages as the name of the code
+/// being parsed.
+///
+/// Throws an [AnalyzerErrorGroup] if any errors occurred, unless
+/// [suppressErrors] is `true`, in which case any errors are discarded.
+CompilationUnit parseCompilationUnit(String contents,
+    {String name, bool suppressErrors: false}) {
+  if (name == null) name = '<unknown source>';
+  var source = new StringSource(contents, name);
+  var errorCollector = new _ErrorCollector();
+  var reader = new CharSequenceReader(contents);
+  var scanner = new Scanner(source, reader, errorCollector);
+  var token = scanner.tokenize();
+  var parser = new Parser(source, errorCollector);
+  var unit = parser.parseCompilationUnit(token);
+  unit.lineInfo = new LineInfo(scanner.lineStarts);
+
+  if (errorCollector.hasErrors && !suppressErrors) throw errorCollector.group;
+
+  return unit;
+}
+
+/// Parses the script tag and directives in a string of Dart code into an AST.
+///
+/// Stops parsing when the first non-directive is encountered. The rest of the
+/// string will not be parsed.
+///
+/// If [name] is passed, it's used in error messages as the name of the code
+/// being parsed.
+///
+/// Throws an [AnalyzerErrorGroup] if any errors occurred, unless
+/// [suppressErrors] is `true`, in which case any errors are discarded.
+CompilationUnit parseDirectives(String contents,
+    {String name, bool suppressErrors: false}) {
+  if (name == null) name = '<unknown source>';
+  var source = new StringSource(contents, name);
+  var errorCollector = new _ErrorCollector();
+  var reader = new CharSequenceReader(contents);
+  var scanner = new Scanner(source, reader, errorCollector);
+  var token = scanner.tokenize();
+  var parser = new Parser(source, errorCollector);
+  var unit = parser.parseDirectives(token);
+  unit.lineInfo = new LineInfo(scanner.lineStarts);
+
+  if (errorCollector.hasErrors && !suppressErrors) throw errorCollector.group;
+
+  return unit;
+}
+
+/// Converts an AST node representing a string literal into a [String].
+String stringLiteralToString(StringLiteral literal) {
+  return literal.stringValue;
+}
+
+/// A simple error listener that collects errors into an [AnalysisErrorGroup].
+class _ErrorCollector extends AnalysisErrorListener {
+  final _errors = <AnalysisError>[];
+
+  /// Whether any errors where collected.
+  bool get hasErrors => !_errors.isEmpty;
+
+  /// The group of errors collected.
+  AnalyzerErrorGroup get group =>
+    new AnalyzerErrorGroup.fromAnalysisErrors(_errors);
+
+  _ErrorCollector();
+
+  void onError(AnalysisError error) => _errors.add(error);
+}