Pull args, intl, logging, shelf, and source_maps out of the SDK.

pkg/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);
-  }
-}