Update analyzer-experimental.

pkg/analyzer-experimental/lib/src/generated/source.dart

Index: pkg/analyzer-experimental/lib/src/generated/source.dart
diff --git a/pkg/analyzer-experimental/lib/src/generated/source.dart b/pkg/analyzer-experimental/lib/src/generated/source.dart
index 811dce2bdf94f0aefca7cf6a0133013347037f27..c6e8ac904ef3420537648e84464eb2903261afc8 100644
--- a/pkg/analyzer-experimental/lib/src/generated/source.dart
+++ b/pkg/analyzer-experimental/lib/src/generated/source.dart
@@ -3,291 +3,10 @@
 
 library engine.source;
 
-import 'dart:io';
 import 'dart:uri';
 import 'java_core.dart';
-import 'package:analyzer-experimental/src/generated/sdk.dart' show DartSdk;
 
 /**
- * Instances of the class {@code FileUriResolver} resolve {@code file} URI's.
- */
-class FileUriResolver extends UriResolver {
-  /**
-   * The name of the {@code file} scheme.
-   */
-  static String _FILE_SCHEME = "file";
-  /**
-   * Return {@code true} if the given URI is a {@code file} URI.
-   * @param uri the URI being tested
-   * @return {@code true} if the given URI is a {@code file} URI
-   */
-  static bool isFileUri(Uri uri) => uri.scheme == _FILE_SCHEME;
-  /**
-   * Initialize a newly created resolver to resolve {@code file} URI's relative to the given root
-   * directory.
-   */
-  FileUriResolver() : super() {
-  }
-  Source resolveAbsolute(SourceFactory factory, Uri uri) {
-    if (!isFileUri(uri)) {
-      return null;
-    }
-    return new FileBasedSource.con1(factory, newFileFromUri(uri));
-  }
-}
-/**
- * Instances of the class {@code DartUriResolver} resolve {@code dart} URI's.
- */
-class DartUriResolver extends UriResolver {
-  /**
-   * The Dart SDK against which URI's are to be resolved.
-   */
-  DartSdk _sdk;
-  /**
-   * The name of the {@code dart} scheme.
-   */
-  static String _DART_SCHEME = "dart";
-  /**
-   * Return {@code true} if the given URI is a {@code dart:} URI.
-   * @param uri the URI being tested
-   * @return {@code true} if the given URI is a {@code dart:} URI
-   */
-  static bool isDartUri(Uri uri) => uri.scheme == _DART_SCHEME;
-  /**
-   * Initialize a newly created resolver to resolve Dart URI's against the given platform within the
-   * given Dart SDK.
-   * @param sdk the Dart SDK against which URI's are to be resolved
-   */
-  DartUriResolver(DartSdk sdk) {
-    this._sdk = sdk;
-  }
-  Source resolveAbsolute(SourceFactory factory, Uri uri) {
-    if (!isDartUri(uri)) {
-      return null;
-    }
-    File resolvedFile = _sdk.mapDartUri(uri.toString());
-    return new FileBasedSource.con2(factory, resolvedFile, true);
-  }
-}
-/**
- * Instances of the class {@code FileBasedSource} implement a source that represents a file.
- */
-class FileBasedSource implements Source {
-  /**
-   * The source factory that created this source and that should be used to resolve URI's against
-   * this source.
-   */
-  SourceFactory _factory;
-  /**
-   * The file represented by this source.
-   */
-  File _file;
-  /**
-   * A flag indicating whether this source is in one of the system libraries.
-   */
-  bool _inSystemLibrary = false;
-  /**
-   * Initialize a newly created source object. The source object is assumed to not be in a system
-   * library.
-   * @param factory the source factory that created this source
-   * @param file the file represented by this source
-   */
-  FileBasedSource.con1(SourceFactory factory, File file) {
-    _jtd_constructor_243_impl(factory, file);
-  }
-  _jtd_constructor_243_impl(SourceFactory factory, File file) {
-    _jtd_constructor_244_impl(factory, file, false);
-  }
-  /**
-   * Initialize a newly created source object.
-   * @param factory the source factory that created this source
-   * @param file the file represented by this source
-   * @param inSystemLibrary {@code true} if this source is in one of the system libraries
-   */
-  FileBasedSource.con2(SourceFactory factory2, File file3, bool inSystemLibrary2) {
-    _jtd_constructor_244_impl(factory2, file3, inSystemLibrary2);
-  }
-  _jtd_constructor_244_impl(SourceFactory factory2, File file3, bool inSystemLibrary2) {
-    this._factory = factory2;
-    this._file = file3;
-    this._inSystemLibrary = inSystemLibrary2;
-  }
-  bool operator ==(Object object) => object != null && identical(this.runtimeType, object.runtimeType) && _file == ((object as FileBasedSource))._file;
-  void getContents(Source_ContentReceiver receiver) {
-    receiver.accept2(_file.readAsStringSync());
-  }
-  String get fullName => _file.fullPathSync();
-  String get shortName => _file.name;
-  int get hashCode => _file.hashCode;
-  bool isInSystemLibrary() => _inSystemLibrary;
-  Source resolve(String uri) => _factory.resolveUri(this, uri);
-  String toString() {
-    if (_file == null) {
-      return "<unknown source>";
-    }
-    return _file.fullPathSync();
-  }
-  /**
-   * Return the file represented by this source. This is an internal method that is only intended to
-   * be used by {@link UriResolver}.
-   * @return the file represented by this source
-   */
-  File get file => _file;
-}
-/**
- * Instances of the class {@link DirectoryBasedSourceContainer} represent a source container that
- * contains all sources within a given directory.
- */
-class DirectoryBasedSourceContainer implements SourceContainer {
-  /**
-   * Append the system file separator to the given path unless the path already ends with a
-   * separator.
-   * @param path the path to which the file separator is to be added
-   * @return a path that ends with the system file separator
-   */
-  static String appendFileSeparator(String path) {
-    if (path == null || path.length <= 0 || path.codeUnitAt(path.length - 1) == System.pathSeparatorChar) {
-      return path;
-    }
-    return "${path}${System.pathSeparator}";
-  }
-  /**
-   * The container's path (not {@code null}).
-   */
-  String _path;
-  /**
-   * Construct a container representing the specified directory and containing any sources whose{@link Source#getFullName()} starts with the directory's path. This is a convenience method,
-   * fully equivalent to {@link DirectoryBasedSourceContainer#DirectoryBasedSourceContainer(String)}.
-   * @param directory the directory (not {@code null})
-   */
-  DirectoryBasedSourceContainer.con1(File directory) {
-    _jtd_constructor_241_impl(directory);
-  }
-  _jtd_constructor_241_impl(File directory) {
-    _jtd_constructor_242_impl(directory.fullPathSync());
-  }
-  /**
-   * Construct a container representing the specified path and containing any sources whose{@link Source#getFullName()} starts with the specified path.
-   * @param path the path (not {@code null} and not empty)
-   */
-  DirectoryBasedSourceContainer.con2(String path3) {
-    _jtd_constructor_242_impl(path3);
-  }
-  _jtd_constructor_242_impl(String path3) {
-    this._path = appendFileSeparator(path3);
-  }
-  bool contains(Source source) => source.fullName.startsWith(_path);
-  bool operator ==(Object obj) => (obj is DirectoryBasedSourceContainer) && ((obj as DirectoryBasedSourceContainer)).path == path;
-  /**
-   * Answer the receiver's path, used to determine if a source is contained in the receiver.
-   * @return the path (not {@code null}, not empty)
-   */
-  String get path => _path;
-  int get hashCode => _path.hashCode;
-}
-/**
- * Instances of the class {@code PackageUriResolver} resolve {@code package} URI's in the context of
- * an application.
- */
-class PackageUriResolver extends UriResolver {
-  /**
-   * The package directories that {@code package} URI's are assumed to be relative to.
-   */
-  List<File> _packagesDirectories;
-  /**
-   * The name of the {@code package} scheme.
-   */
-  static String _PACKAGE_SCHEME = "package";
-  /**
-   * Return {@code true} if the given URI is a {@code package} URI.
-   * @param uri the URI being tested
-   * @return {@code true} if the given URI is a {@code package} URI
-   */
-  static bool isPackageUri(Uri uri) => uri.scheme == _PACKAGE_SCHEME;
-  /**
-   * Initialize a newly created resolver to resolve {@code package} URI's relative to the given
-   * package directories.
-   * @param packagesDirectories the package directories that {@code package} URI's are assumed to be
-   * relative to
-   */
-  PackageUriResolver(List<File> packagesDirectories) {
-    if (packagesDirectories.length < 1) {
-      throw new IllegalArgumentException("At least one package directory must be provided");
-    }
-    this._packagesDirectories = packagesDirectories;
-  }
-  Source resolveAbsolute(SourceFactory factory, Uri uri) {
-    if (!isPackageUri(uri)) {
-      return null;
-    }
-    String path4 = uri.path;
-    if (path4 == null) {
-      path4 = uri.path;
-      if (path4 == null) {
-        return null;
-      }
-    }
-    for (File packagesDirectory in _packagesDirectories) {
-      File resolvedFile = newRelativeFile(packagesDirectory, path4);
-      if (resolvedFile.existsSync()) {
-        return new FileBasedSource.con1(factory, resolvedFile);
-      }
-    }
-    return new FileBasedSource.con1(factory, newRelativeFile(_packagesDirectories[0], path4));
-  }
-}
-/**
- * The abstract class {@code UriResolver} defines the behavior of objects that are used to resolve
- * URI's for a source factory. Subclasses of this class are expected to resolve a single scheme of
- * absolute URI.
- */
-abstract class UriResolver {
-  /**
-   * Initialize a newly created resolver.
-   */
-  UriResolver() : super() {
-  }
-  /**
-   * Working on behalf of the given source factory, resolve the (possibly relative) contained URI
-   * against the URI associated with the containing source object. Return a {@link Source source}representing the file to which it was resolved, or {@code null} if it could not be resolved.
-   * @param factory the source factory requesting the resolution of the URI
-   * @param containingSource the source containing the given URI
-   * @param containedUri the (possibly relative) URI to be resolved against the containing source
-   * @return a {@link Source source} representing the URI to which given URI was resolved
-   */
-  Source resolve(SourceFactory factory, Source containingSource, Uri containedUri) {
-    if (containedUri.isAbsolute()) {
-      return resolveAbsolute(factory, containedUri);
-    } else {
-      return resolveRelative(factory, containingSource, containedUri);
-    }
-  }
-  /**
-   * Resolve the given absolute URI. Return a {@link Source source} representing the file to which
-   * it was resolved, or {@code null} if it could not be resolved.
-   * @param uri the URI to be resolved
-   * @return a {@link Source source} representing the URI to which given URI was resolved
-   */
-  Source resolveAbsolute(SourceFactory factory, Uri uri);
-  /**
-   * Resolve the relative (contained) URI against the URI associated with the containing source
-   * object. Return a {@link Source source} representing the file to which it was resolved, or{@code null} if it could not be resolved.
-   * @param containingSource the source containing the given URI
-   * @param containedUri the (possibly relative) URI to be resolved against the containing source
-   * @return a {@link Source source} representing the URI to which given URI was resolved
-   */
-  Source resolveRelative(SourceFactory factory, Source containingSource, Uri containedUri) {
-    if (containingSource is FileBasedSource) {
-      try {
-        Uri resolvedUri = newUriFromFile(((containingSource as FileBasedSource)).file).resolveUri(containedUri);
-        return new FileBasedSource.con1(factory, newFileFromUri(resolvedUri));
-      } on JavaException catch (exception) {
-      }
-    }
-    return null;
-  }
-}
-/**
  * Instances of the class {@code SourceFactory} resolve possibly relative URI's against an existing{@link Source source}.
  */
 class SourceFactory {
@@ -305,9 +24,9 @@ class SourceFactory {
    * @param resolvers the resolvers used to resolve absolute URI's
    */
   SourceFactory.con1(ContentCache contentCache2, List<UriResolver> resolvers2) {
-    _jtd_constructor_247_impl(contentCache2, resolvers2);
+    _jtd_constructor_282_impl(contentCache2, resolvers2);
   }
-  _jtd_constructor_247_impl(ContentCache contentCache2, List<UriResolver> resolvers2) {
+  _jtd_constructor_282_impl(ContentCache contentCache2, List<UriResolver> resolvers2) {
     this._contentCache = contentCache2;
     this._resolvers = resolvers2;
   }
@@ -316,24 +35,12 @@ class SourceFactory {
    * @param resolvers the resolvers used to resolve absolute URI's
    */
   SourceFactory.con2(List<UriResolver> resolvers) {
-    _jtd_constructor_248_impl(resolvers);
+    _jtd_constructor_283_impl(resolvers);
   }
-  _jtd_constructor_248_impl(List<UriResolver> resolvers) {
-    _jtd_constructor_247_impl(new ContentCache(), [resolvers]);
+  _jtd_constructor_283_impl(List<UriResolver> resolvers) {
+    _jtd_constructor_282_impl(new ContentCache(), [resolvers]);
   }
   /**
-   * Return a source container representing the given directory
-   * @param directory the directory (not {@code null})
-   * @return the source container representing the directory (not {@code null})
-   */
-  SourceContainer forDirectory(File directory) => new DirectoryBasedSourceContainer.con1(directory);
-  /**
-   * Return a source object representing the given file.
-   * @param file the file to be represented by the returned source object
-   * @return a source object representing the given file
-   */
-  Source forFile(File file) => new FileBasedSource.con1(this, file);
-  /**
    * Return a source object representing the given absolute URI, or {@code null} if the URI is not a
    * valid URI or if it is not an absolute URI.
    * @param absoluteUri the absolute URI to be resolved
@@ -342,7 +49,7 @@ class SourceFactory {
   Source forUri(String absoluteUri) {
     try {
       Uri uri = new Uri.fromComponents(path: absoluteUri);
-      if (uri.isAbsolute()) {
+      if (uri.isAbsolute) {
         return resolveUri2(null, uri);
       }
     } on URISyntaxException catch (exception) {
@@ -350,6 +57,13 @@ class SourceFactory {
     return null;
   }
   /**
+   * Return a source object that is equal to the source object used to obtain the given encoding, or{@code null} if the argument is not a valid encoding.
+   * @param encoding the encoding of a source object
+   * @return a source object that is described by the given encoding
+   * @see Source#getEncoding()
+   */
+  Source fromEncoding(String encoding) => forUri(encoding);
+  /**
    * Return a source object representing the URI that results from resolving the given (possibly
    * relative) contained URI against the URI associated with an existing source object, or{@code null} if either the contained URI is invalid or if it cannot be resolved against the
    * source object's URI.
@@ -392,21 +106,48 @@ class SourceFactory {
    * @return the source representing the contained URI
    */
   Source resolveUri2(Source containingSource, Uri containedUri) {
-    for (UriResolver resolver in _resolvers) {
-      Source result = resolver.resolve(this, containingSource, containedUri);
-      if (result != null) {
-        return result;
+    if (containedUri.isAbsolute) {
+      for (UriResolver resolver in _resolvers) {
+        Source result = resolver.resolveAbsolute(this, containedUri);
+        if (result != null) {
+          return result;
+        }
       }
+      return null;
+    } else {
+      return containingSource.resolveRelative(containedUri);
     }
-    return null;
   }
 }
 /**
+ * The abstract class {@code UriResolver} defines the behavior of objects that are used to resolve
+ * URI's for a source factory. Subclasses of this class are expected to resolve a single scheme of
+ * absolute URI.
+ */
+abstract class UriResolver {
+  /**
+   * Initialize a newly created resolver.
+   */
+  UriResolver() : super() {
+  }
+  /**
+   * Resolve the given absolute URI. Return a {@link Source source} representing the file to which
+   * it was resolved, or {@code null} if it could not be resolved.
+   * @param uri the URI to be resolved
+   * @return a {@link Source source} representing the URI to which given URI was resolved
+   */
+  Source resolveAbsolute(SourceFactory factory, Uri uri);
+}
+/**
  * The interface {@code Source} defines the behavior of objects representing source code that can be
  * compiled.
  */
 abstract class Source {
   /**
+   * An empty array of sources.
+   */
+  static List<Source> EMPTY_ARRAY = new List<Source>(0);
+  /**
    * Return {@code true} if the given object is a source that represents the same source code as
    * this source.
    * @param object the object to be compared with this object
@@ -416,6 +157,11 @@ abstract class Source {
    */
   bool operator ==(Object object);
   /**
+   * Return {@code true} if this source exists.
+   * @return {@code true} if this source exists
+   */
+  bool exists();
+  /**
    * Get the contents of this source and pass it to the given receiver. Exactly one of the methods
    * defined on the receiver will be invoked unless an exception is thrown. The method that will be
    * invoked depends on which of the possible representations of the contents is the most efficient.
@@ -425,6 +171,13 @@ abstract class Source {
    */
   void getContents(Source_ContentReceiver receiver);
   /**
+   * Return an encoded representation of this source that can be used to create a source that is
+   * equal to this source.
+   * @return an encoded representation of this source
+   * @see SourceFactory#fromEncoding(String)
+   */
+  String get encoding;
+  /**
    * Return the full (long) version of the name that can be displayed to the user to denote this
    * source. For example, for a source representing a file this would typically be the absolute path
    * of the file.
@@ -454,6 +207,19 @@ abstract class Source {
    * @return a source representing the resolved URI
    */
   Source resolve(String uri);
+  /**
+   * Resolve the relative URI against the URI associated with this source object. Return a{@link Source source} representing the URI to which it was resolved, or {@code null} if it
+   * could not be resolved.
+   * <p>
+   * Note: This method is not intended for public use, it is only visible out of necessity. It is
+   * only intended to be invoked by a {@link SourceFactory source factory}. Source factories will
+   * only invoke this method if the URI is relative, so implementations of this method are not
+   * required to, and generally do not, verify the argument. The result of invoking this method with
+   * an absolute URI is intentionally left unspecified.
+   * @param relativeUri the relative URI to be resolved against the containing source
+   * @return a {@link Source source} representing the URI to which given URI was resolved
+   */
+  Source resolveRelative(Uri relativeUri);
 }
 /**
  * The interface {@code ContentReceiver} defines the behavior of objects that can receive the
@@ -472,36 +238,140 @@ abstract class Source_ContentReceiver {
   void accept2(String contents);
 }
 /**
- * Instances of class {@code ContentCache} hold content used to override the default content of a{@link Source}.
+ * The enumeration {@code SourceKind} defines the different kinds of sources that are known to the
+ * analysis engine.
  */
-class ContentCache {
+class SourceKind {
   /**
-   * A table mapping sources to the contents of those sources. This is used to override the default
-   * contents of a source.
+   * A source containing HTML. The HTML might or might not contain Dart scripts.
    */
-  Map<Source, String> _contentMap = new Map<Source, String>();
+  static final SourceKind HTML = new SourceKind('HTML', 0);
   /**
-   * Return the contents of the given source, or {@code null} if this cache does not override the
-   * contents of the source.
-   * <p>
-   * <b>Note:</b> This method is not intended to be used except by{@link SourceFactory#getContents(com.google.dart.engine.source.Source.ContentReceiver)}.
-   * @param source the source whose content is to be returned
-   * @return the contents of the given source
+   * A Dart compilation unit that is not a part of another library. Libraries might or might not
+   * contain any directives, including a library directive.
    */
-  String getContents(Source source) => _contentMap[source];
+  static final SourceKind LIBRARY = new SourceKind('LIBRARY', 1);
   /**
-   * Set the contents of the given source to the given contents. This has the effect of overriding
-   * the default contents of the source. If the contents are {@code null} the override is removed so
-   * that the default contents will be returned.
-   * @param source the source whose contents are being overridden
-   * @param contents the new contents of the source
+   * A Dart compilation unit that is part of another library. Parts contain a part-of directive.
    */
-  void setContents(Source source, String contents) {
-    if (contents == null) {
-      _contentMap.remove(source);
-    } else {
-      _contentMap[source] = contents;
+  static final SourceKind PART = new SourceKind('PART', 2);
+  /**
+   * An unknown kind of source. Used both when it is not possible to identify the kind of a source
+   * and also when the kind of a source is not known without performing a computation and the client
+   * does not want to spend the time to identify the kind.
+   */
+  static final SourceKind UNKNOWN = new SourceKind('UNKNOWN', 3);
+  static final List<SourceKind> values = [HTML, LIBRARY, PART, UNKNOWN];
+  final String __name;
+  final int __ordinal;
+  SourceKind(this.__name, this.__ordinal) {
+  }
+  String toString() => __name;
+}
+/**
+ * A source range defines an {@link Element}'s source coordinates relative to its {@link Source}.
+ */
+class SourceRange {
+  /**
+   * The 0-based index of the first character of the source code for this element, relative to the
+   * source buffer in which this element is contained.
+   */
+  int _offset = 0;
+  /**
+   * The number of characters of the source code for this element, relative to the source buffer in
+   * which this element is contained.
+   */
+  int _length = 0;
+  /**
+   * Initialize a newly created source range using the given offset and the given length.
+   * @param offset the given offset
+   * @param length the given length
+   */
+  SourceRange(int offset, int length) {
+    this._offset = offset;
+    this._length = length;
+  }
+  /**
+   * @return <code>true</code> if <code>x</code> is in [offset, offset + length) interval.
+   */
+  bool contains(int x) => _offset <= x && x < _offset + _length;
+  /**
+   * @return <code>true</code> if <code>otherRange</code> covers this {@link SourceRange}.
+   */
+  bool coveredBy(SourceRange otherRange) => otherRange.covers(this);
+  /**
+   * @return <code>true</code> if this {@link SourceRange} covers <code>otherRange</code>.
+   */
+  bool covers(SourceRange otherRange) => offset <= otherRange.offset && otherRange.end <= end;
+  /**
+   * @return <code>true</code> if this {@link SourceRange} ends in <code>otherRange</code>.
+   */
+  bool endsIn(SourceRange otherRange) {
+    int thisEnd = end;
+    return otherRange.contains(thisEnd);
+  }
+  bool operator ==(Object obj) {
+    if (obj is! SourceRange) {
+      return false;
     }
+    SourceRange sourceRange = obj as SourceRange;
+    return sourceRange.offset == _offset && sourceRange.length == _length;
+  }
+  /**
+   * @return the 0-based index of the after-last character of the source code for this element,
+   * relative to the source buffer in which this element is contained.
+   */
+  int get end => _offset + _length;
+  /**
+   * @return the expanded instance of {@link SourceRange}, which has the same center.
+   */
+  SourceRange getExpanded(int delta) => new SourceRange(_offset - delta, delta + _length + delta);
+  /**
+   * Returns the number of characters of the source code for this element, relative to the source
+   * buffer in which this element is contained.
+   * @return the number of characters of the source code for this element, relative to the source
+   * buffer in which this element is contained
+   */
+  int get length => _length;
+  /**
+   * @return the instance of {@link SourceRange} with end moved on "delta".
+   */
+  SourceRange getMoveEnd(int delta) => new SourceRange(_offset, _length + delta);
+  /**
+   * Returns the 0-based index of the first character of the source code for this element, relative
+   * to the source buffer in which this element is contained.
+   * @return the 0-based index of the first character of the source code for this element, relative
+   * to the source buffer in which this element is contained
+   */
+  int get offset => _offset;
+  int get hashCode => 31 * _offset + _length;
+  /**
+   * @return <code>true</code> if this {@link SourceRange} intersects with given.
+   */
+  bool intersects(SourceRange other) {
+    if (other == null) {
+      return false;
+    }
+    if (end <= other.offset) {
+      return false;
+    }
+    if (offset >= other.end) {
+      return false;
+    }
+    return true;
+  }
+  /**
+   * @return <code>true</code> if this {@link SourceRange} starts in <code>otherRange</code>.
+   */
+  bool startsIn(SourceRange otherRange) => otherRange.contains(_offset);
+  String toString() {
+    StringBuffer builder = new StringBuffer();
+    builder.write("[offset=");
+    builder.write(_offset);
+    builder.write(", length=");
+    builder.write(_length);
+    builder.write("]");
+    return builder.toString();
   }
 }
 /**
@@ -592,33 +462,35 @@ class LineInfo_Location {
   int get lineNumber => _lineNumber;
 }
 /**
- * The enumeration {@code SourceKind} defines the different kinds of sources that are known to the
- * analysis engine.
+ * Instances of class {@code ContentCache} hold content used to override the default content of a{@link Source}.
  */
-class SourceKind {
-  /**
-   * A source containing HTML. The HTML might or might not contain Dart scripts.
-   */
-  static final SourceKind HTML = new SourceKind('HTML', 0);
+class ContentCache {
   /**
-   * A Dart compilation unit that is not a part of another library. Libraries might or might not
-   * contain any directives, including a library directive.
+   * A table mapping sources to the contents of those sources. This is used to override the default
+   * contents of a source.
    */
-  static final SourceKind LIBRARY = new SourceKind('LIBRARY', 1);
+  Map<Source, String> _contentMap = new Map<Source, String>();
   /**
-   * A Dart compilation unit that is part of another library. Parts contain a part-of directive.
+   * Return the contents of the given source, or {@code null} if this cache does not override the
+   * contents of the source.
+   * <p>
+   * <b>Note:</b> This method is not intended to be used except by{@link SourceFactory#getContents(com.google.dart.engine.source.Source.ContentReceiver)}.
+   * @param source the source whose content is to be returned
+   * @return the contents of the given source
    */
-  static final SourceKind PART = new SourceKind('PART', 2);
+  String getContents(Source source) => _contentMap[source];
   /**
-   * An unknown kind of source. Used both when it is not possible to identify the kind of a source
-   * and also when the kind of a source is not known without performing a computation and the client
-   * does not want to spend the time to identify the kind.
+   * Set the contents of the given source to the given contents. This has the effect of overriding
+   * the default contents of the source. If the contents are {@code null} the override is removed so
+   * that the default contents will be returned.
+   * @param source the source whose contents are being overridden
+   * @param contents the new contents of the source
    */
-  static final SourceKind UNKNOWN = new SourceKind('UNKNOWN', 3);
-  static final List<SourceKind> values = [HTML, LIBRARY, PART, UNKNOWN];
-  final String __name;
-  final int __ordinal;
-  SourceKind(this.__name, this.__ordinal) {
+  void setContents(Source source, String contents) {
+    if (contents == null) {
+      _contentMap.remove(source);
+    } else {
+      _contentMap[source] = contents;
+    }
   }
-  String toString() => __name;
 }