Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/source_maps/lib/builder.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.
+
+/// Contains a builder object useful for creating source maps programatically.
+library source_maps.builder;
+
+// TODO(sigmund): add a builder for multi-section mappings.
+
+import 'dart:convert';
+
+import 'package:source_span/source_span.dart';
+
+import 'parser.dart';
+import 'src/source_map_span.dart';
+
+/// Builds a source map given a set of mappings.
+class SourceMapBuilder {
+
+  final List<Entry> _entries = <Entry>[];
+
+  /// Adds an entry mapping the [targetOffset] to [source].
+  void addFromOffset(SourceLocation source, SourceFile targetFile,
+      int targetOffset, String identifier) {
+    if (targetFile == null) {
+      throw new ArgumentError('targetFile cannot be null');
+    }
+    _entries.add(
+        new Entry(source, targetFile.location(targetOffset), identifier));
+  }
+
+  /// Adds an entry mapping [target] to [source].
+  ///
+  /// If [isIdentifier] is true or if [target] is a [SourceMapSpan] with
+  /// `isIdentifier` set to true, this entry is considered to represent an
+  /// identifier whose value will be stored in the source map. [isIdenfier]
+  /// takes precedence over [target]'s `isIdentifier` value.
+  void addSpan(SourceSpan source, SourceSpan target, {bool isIdentifier}) {
+    if (isIdentifier == null) {
+      isIdentifier = source is SourceMapSpan ? source.isIdentifier : false;
+    }
+
+    var name = isIdentifier ? source.text : null;
+    _entries.add(new Entry(source.start, target.start, name));
+  }
+
+  /// Adds an entry mapping [target] to [source].
+  void addLocation(SourceLocation source, SourceLocation target,
+      String identifier) {
+    _entries.add(new Entry(source, target, identifier));
+  }
+
+  /// Encodes all mappings added to this builder as a json map.
+  Map build(String fileUrl) {
+    return new SingleMapping.fromEntries(this._entries, fileUrl).toJson();
+  }
+
+  /// Encodes all mappings added to this builder as a json string.
+  String toJson(String fileUrl) => JSON.encode(build(fileUrl));
+}
+
+/// An entry in the source map builder.
+class Entry implements Comparable {
+  /// Span denoting the original location in the input source file
+  final SourceLocation source;
+
+  /// Span indicating the corresponding location in the target file.
+  final SourceLocation target;
+
+  /// An identifier name, when this location is the start of an identifier.
+  final String identifierName;
+
+  /// Creates a new [Entry] mapping [target] to [source].
+  Entry(this.source, this.target, this.identifierName);
+
+  /// Implements [Comparable] to ensure that entries are ordered by their
+  /// location in the target file. We sort primarily by the target offset
+  /// because source map files are encoded by printing each mapping in order as
+  /// they appear in the target file.
+  int compareTo(Entry other) {
+    int res = target.compareTo(other.target);
+    if (res != 0) return res;
+    res = source.sourceUrl.toString().compareTo(
+        other.source.sourceUrl.toString());
+    if (res != 0) return res;
+    return source.compareTo(other.source);
+  }
+}