Move a number of packages and some of pub over to using source_span.

pkg/yaml/lib/src/model.dart

 // Copyright (c) 2012, 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.
 
 /// This file contains the node classes for the internal representations of YAML
 /// documents. These nodes are used for both the serialization tree and the
 /// representation graph.
 library yaml.model;
 
-import 'package:source_maps/source_maps.dart';
+import 'package:source_span/source_span.dart';
 
 import 'equality.dart';
 import 'parser.dart';
 import 'visitor.dart';
 import 'yaml_exception.dart';
 
 /// The prefix for tag types defined by the YAML spec.
 const _YAML_URI_PREFIX = "tag:yaml.org,2002:";
 
 /// A tag that indicates the type of a YAML node.
@@ skipping 55 matching lines @@
 
 /// The abstract class for YAML nodes.
 abstract class Node {
   /// Every YAML node has a tag that describes its type.
   Tag tag;
 
   /// Any YAML node can have an anchor associated with it.
   String anchor;
 
   /// The source span for this node.
-  Span span;
+  SourceSpan span;
 
   Node(this.tag, this.span, [this.anchor]);
 
   bool operator ==(other) {
     if (other is! Node) return false;
     return tag == other.tag;
   }
 
   int get hashCode => tag.hashCode ^ anchor.hashCode;
 
   visit(Visitor v);
 }
 
 /// A sequence node represents an ordered list of nodes.
 class SequenceNode extends Node {
   /// The nodes in the sequence.
   List<Node> content;
 
-  SequenceNode(String tagName, this.content, Span span)
+  SequenceNode(String tagName, this.content, SourceSpan span)
     : super(new Tag.sequence(tagName), span);
 
   /// Two sequences are equal if their tags and contents are equal.
   bool operator ==(other) {
     // Should be super != other; bug 2554
     if (!(super == other) || other is! SequenceNode) return false;
     if (content.length != other.content.length) return false;
     for (var i = 0; i < content.length; i++) {
       if (content[i] != other.content[i]) return false;
     }
     return true;
   }
 
   String toString() => '$tag [${content.map((e) => '$e').join(', ')}]';
 
   int get hashCode => super.hashCode ^ deepHashCode(content);
 
   visit(Visitor v) => v.visitSequence(this);
 }
 
 /// An alias node is a reference to an anchor.
 class AliasNode extends Node {
-  AliasNode(String anchor, Span span)
+  AliasNode(String anchor, SourceSpan span)
       : super(new Tag.scalar(Tag.yaml("str")), span, anchor);
 
   visit(Visitor v) => v.visitAlias(this);
 }
 
 /// A scalar node represents all YAML nodes that have a single value.
 class ScalarNode extends Node {
   /// The string value of the scalar node, if it was created by the parser.
   final String _content;
 
   /// The Dart value of the scalar node, if it was created by the composer.
   final value;
 
   /// Creates a new Scalar node.
   ///
   /// Exactly one of [content] and [value] should be specified. Content should
   /// be specified for a newly-parsed scalar that hasn't yet been composed.
   /// Value should be specified for a composed scalar, although `null` is a
   /// valid value.
-  ScalarNode(String tagName, Span span, {String content, this.value})
+  ScalarNode(String tagName, SourceSpan span, {String content, this.value})
    : _content = content,
      super(new Tag.scalar(tagName), span);
 
   /// Two scalars are equal if their string representations are equal.
   bool operator ==(other) {
     // Should be super != other; bug 2554
     if (!(super == other) || other is! ScalarNode) return false;
     return content == other.content;
   }
 
@@ skipping 65 matching lines @@
   int get hashCode => super.hashCode ^ content.hashCode;
 
   visit(Visitor v) => v.visitScalar(this);
 }
 
 /// A mapping node represents an unordered map of nodes to nodes.
 class MappingNode extends Node {
   /// The node map.
   Map<Node, Node> content;
 
-  MappingNode(String tagName, this.content, Span span)
+  MappingNode(String tagName, this.content, SourceSpan span)
     : super(new Tag.mapping(tagName), span);
 
   /// Two mappings are equal if their tags and contents are equal.
   bool operator ==(other) {
     // Should be super != other; bug 2554
     if (!(super == other) || other is! MappingNode) return false;
     if (content.length != other.content.length) return false;
     for (var key in content.keys) {
       if (!other.content.containsKey(key)) return false;
       if (content[key] != other.content[key]) return false;
     }
     return true;
   }
 
   String toString() {
     var strContent = content.keys
         .map((k) => '${k}: ${content[k]}')
         .join(', ');
     return '$tag {$strContent}';
   }
 
   int get hashCode => super.hashCode ^ deepHashCode(content);
 
   visit(Visitor v) => v.visitMapping(this);
 }