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

pkg/source_maps/lib/src/source_map_span.dart

-// Copyright (c) 2014, 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 source_maps.source_map_span;
-
-import 'package:source_span/source_span.dart';
-
-/// A [SourceSpan] for spans coming from or being written to source maps.
-///
-/// These spans have an extra piece of metadata: whether or not they represent
-/// an identifier (see [isIdentifier]).
-class SourceMapSpan extends SourceSpanBase {
-  /// Whether this span represents an identifier.
-  ///
-  /// If this is `true`, [text] is the value of the identifier.
-  final bool isIdentifier;
-
-  SourceMapSpan(SourceLocation start, SourceLocation end, String text,
-          {this.isIdentifier: false})
-      : super(start, end, text);
-
-  /// Creates a [SourceMapSpan] for an identifier with value [text] starting at
-  /// [start].
-  ///
-  /// The [end] location is determined by adding [text] to [start].
-  SourceMapSpan.identifier(SourceLocation start, String text)
-      : this(
-          start,
-          new SourceLocation(start.offset + text.length,
-              sourceUrl: start.sourceUrl,
-              line: start.line,
-              column: start.column + text.length),
-          text,
-          isIdentifier: true);
-}
-
-/// A wrapper aruond a [FileSpan] that implements [SourceMapSpan].
-class SourceMapFileSpan implements SourceMapSpan, FileSpan {
-  final FileSpan _inner;
-  final bool isIdentifier;
-
-  SourceFile get file => _inner.file;
-  FileLocation get start => _inner.start;
-  FileLocation get end => _inner.end;
-  String get text => _inner.text;
-  Uri get sourceUrl => _inner.sourceUrl;
-  int get length => _inner.length;
-
-  SourceMapFileSpan(this._inner, {this.isIdentifier: false});
-
-  int compareTo(SourceSpan other) => _inner.compareTo(other);
-  SourceSpan union(SourceSpan other) => _inner.union(other);
-  FileSpan expand(FileSpan other) => _inner.expand(other);
-  String message(String message, {color}) =>
-      _inner.message(message, color: color);
-  String toString() => _inner.toString()
-      .replaceAll("FileSpan", "SourceMapFileSpan");
-}