pkg/analyzer_experimental/lib/src/generated/engine.dart

// This code was auto-generated, is not intended to be edited, and is subject to
// significant change. Please see the README file for more information.

library engine;

import 'dart:collection' show HasNextIterator;
import 'dart:uri' show Uri;
import 'java_core.dart';
import 'java_engine.dart';
import 'instrumentation.dart';
import 'error.dart';
import 'source.dart';
import 'scanner.dart' show Token, CharBufferScanner, StringScanner;
import 'ast.dart';
import 'parser.dart' show Parser;
import 'sdk.dart' show DartSdk;
import 'element.dart';
import 'resolver.dart';
import 'html.dart' show XmlTagNode, XmlAttributeNode, RecursiveXmlVisitor, HtmlScanner, HtmlScanResult, HtmlParser, HtmlParseResult, HtmlUnit;

/**
 * The unique instance of the class {@code AnalysisEngine} serves as the entry point for the
 * functionality provided by the analysis engine.
 * @coverage dart.engine
 */
class AnalysisEngine {
  /**
   * The suffix used for Dart source files.
   */
  static String SUFFIX_DART = "dart";
  /**
   * The short suffix used for HTML files.
   */
  static String SUFFIX_HTM = "htm";
  /**
   * The long suffix used for HTML files.
   */
  static String SUFFIX_HTML = "html";
  /**
   * The unique instance of this class.
   */
  static AnalysisEngine _UniqueInstance = new AnalysisEngine();
  /**
   * Return the unique instance of this class.
   * @return the unique instance of this class
   */
  static AnalysisEngine get instance => _UniqueInstance;
  /**
   * Return {@code true} if the given file name is assumed to contain Dart source code.
   * @param fileName the name of the file being tested
   * @return {@code true} if the given file name is assumed to contain Dart source code
   */
  static bool isDartFileName(String fileName) {
    if (fileName == null) {
      return false;
    }
    return javaStringEqualsIgnoreCase(FileNameUtilities.getExtension(fileName), SUFFIX_DART);
  }
  /**
   * Return {@code true} if the given file name is assumed to contain HTML.
   * @param fileName the name of the file being tested
   * @return {@code true} if the given file name is assumed to contain HTML
   */
  static bool isHtmlFileName(String fileName) {
    if (fileName == null) {
      return false;
    }
    String extension = FileNameUtilities.getExtension(fileName);
    return javaStringEqualsIgnoreCase(extension, SUFFIX_HTML) || javaStringEqualsIgnoreCase(extension, SUFFIX_HTM);
  }
  /**
   * The logger that should receive information about errors within the analysis engine.
   */
  Logger _logger = Logger.NULL;
  /**
   * Prevent the creation of instances of this class.
   */
  AnalysisEngine() : super() {
  }
  /**
   * Create a new context in which analysis can be performed.
   * @return the analysis context that was created
   */
  AnalysisContext createAnalysisContext() {
    if (Instrumentation.isNullLogger()) {
      return new DelegatingAnalysisContextImpl();
    } else {
      return new InstrumentedAnalysisContextImpl.con1(new DelegatingAnalysisContextImpl());
    }
  }
  /**
   * Return the logger that should receive information about errors within the analysis engine.
   * @return the logger that should receive information about errors within the analysis engine
   */
  Logger get logger => _logger;
  /**
   * Set the logger that should receive information about errors within the analysis engine to the
   * given logger.
   * @param logger the logger that should receive information about errors within the analysis
   * engine
   */
  void set logger(Logger logger2) {
    this._logger = logger2 == null ? Logger.NULL : logger2;
  }
}
/**
 * The interface {@code AnalysisContext} defines the behavior of objects that represent a context in
 * which a single analysis can be performed and incrementally maintained. The context includes such
 * information as the version of the SDK being analyzed against as well as the package-root used to
 * resolve 'package:' URI's. (Both of which are known indirectly through the {@link SourceFactorysource factory}.)
 * <p>
 * An analysis context also represents the state of the analysis, which includes knowing which
 * sources have been included in the analysis (either directly or indirectly) and the results of the
 * analysis. Sources must be added and removed from the context using the method{@link #applyChanges(ChangeSet)}, which is also used to notify the context when sources have been
 * modified and, consequently, previously known results might have been invalidated.
 * <p>
 * There are two ways to access the results of the analysis. The most common is to use one of the
 * 'get' methods to access the results. The 'get' methods have the advantage that they will always
 * return quickly, but have the disadvantage that if the results are not currently available they
 * will return either nothing or in some cases an incomplete result. The second way to access
 * results is by using one of the 'compute' methods. The 'compute' methods will always attempt to
 * compute the requested results but might block the caller for a significant period of time.
 * <p>
 * When results have been invalidated, have never been computed (as is the case for newly added
 * sources), or have been removed from the cache, they are <b>not</b> automatically recreated. They
 * will only be recreated if one of the 'compute' methods is invoked.
 * <p>
 * However, this is not always acceptable. Some clients need to keep the analysis results
 * up-to-date. For such clients there is a mechanism that allows them to incrementally perform
 * needed analysis and get notified of the consequent changes to the analysis results. This
 * mechanism is realized by the method {@link #performAnalysisTask()}.
 * <p>
 * Analysis engine allows for having more than one context. This can be used, for example, to
 * perform one analysis based on the state of files on disk and a separate analysis based on the
 * state of those files in open editors. It can also be used to perform an analysis based on a
 * proposed future state, such as the state after a refactoring.
 */
abstract class AnalysisContext {
  /**
   * Apply the changes specified by the given change set to this context. Any analysis results that
   * have been invalidated by these changes will be removed.
   * @param changeSet a description of the changes that are to be applied
   */
  void applyChanges(ChangeSet changeSet);
  /**
   * Return the documentation comment for the given element as it appears in the original source
   * (complete with the beginning and ending delimiters), or {@code null} if the element does not
   * have a documentation comment associated with it. This can be a long-running operation if the
   * information needed to access the comment is not cached.
   * @param element the element whose documentation comment is to be returned
   * @return the element's documentation comment
   * @throws AnalysisException if the documentation comment could not be determined because the
   * analysis could not be performed
   */
  String computeDocumentationComment(Element element);
  /**
   * Return an array containing all of the errors associated with the given source. If the errors
   * are not already known then the source will be analyzed in order to determine the errors
   * associated with it.
   * @param source the source whose errors are to be returned
   * @return all of the errors associated with the given source
   * @throws AnalysisException if the errors could not be determined because the analysis could not
   * be performed
   * @see #getErrors(Source)
   */
  List<AnalysisError> computeErrors(Source source);
  /**
   * Return the element model corresponding to the HTML file defined by the given source. If the
   * element model does not yet exist it will be created. The process of creating an element model
   * for an HTML file can long-running, depending on the size of the file and the number of
   * libraries that are defined in it (via script tags) that also need to have a model built for
   * them.
   * @param source the source defining the HTML file whose element model is to be returned
   * @return the element model corresponding to the HTML file defined by the given source
   * @throws AnalysisException if the element model could not be determined because the analysis
   * could not be performed
   * @see #getHtmlElement(Source)
   */
  HtmlElement computeHtmlElement(Source source);
  /**
   * Return the kind of the given source, computing it's kind if it is not already known. Return{@link SourceKind#UNKNOWN} if the source is not contained in this context.
   * @param source the source whose kind is to be returned
   * @return the kind of the given source
   * @see #getKindOf(Source)
   */
  SourceKind computeKindOf(Source source);
  /**
   * Return the element model corresponding to the library defined by the given source. If the
   * element model does not yet exist it will be created. The process of creating an element model
   * for a library can long-running, depending on the size of the library and the number of
   * libraries that are imported into it that also need to have a model built for them.
   * @param source the source defining the library whose element model is to be returned
   * @return the element model corresponding to the library defined by the given source
   * @throws AnalysisException if the element model could not be determined because the analysis
   * could not be performed
   * @see #getLibraryElement(Source)
   */
  LibraryElement computeLibraryElement(Source source);
  /**
   * Return the line information for the given source, or {@code null} if the source is not of a
   * recognized kind (neither a Dart nor HTML file). If the line information was not previously
   * known it will be created. The line information is used to map offsets from the beginning of the
   * source to line and column pairs.
   * @param source the source whose line information is to be returned
   * @return the line information for the given source
   * @throws AnalysisException if the line information could not be determined because the analysis
   * could not be performed
   * @see #getLineInfo(Source)
   */
  LineInfo computeLineInfo(Source source);
  /**
   * Create a new context in which analysis can be performed. Any sources in the specified container
   * will be removed from this context and added to the newly created context.
   * @param container the container containing sources that should be removed from this context and
   * added to the returned context
   * @return the analysis context that was created
   */
  AnalysisContext extractContext(SourceContainer container);
  /**
   * Return the element referenced by the given location, or {@code null} if the element is not
   * immediately available or if there is no element with the given location. The latter condition
   * can occur, for example, if the location describes an element from a different context or if the
   * element has been removed from this context as a result of some change since it was originally
   * obtained.
   * @param location the reference describing the element to be returned
   * @return the element referenced by the given location
   */
  Element getElement(ElementLocation location);
  /**
   * Return an analysis error info containing the array of all of the errors and the line info
   * associated with the given source. The array of errors will be empty if the source is not known
   * to this context or if there are no errors in the source. The errors contained in the array can
   * be incomplete.
   * @param source the source whose errors are to be returned
   * @return all of the errors associated with the given source and the line info
   * @see #computeErrors(Source)
   */
  AnalysisErrorInfo getErrors(Source source);
  /**
   * Return the element model corresponding to the HTML file defined by the given source, or{@code null} if the source does not represent an HTML file, the element representing the file
   * has not yet been created, or the analysis of the HTML file failed for some reason.
   * @param source the source defining the HTML file whose element model is to be returned
   * @return the element model corresponding to the HTML file defined by the given source
   * @see #computeHtmlElement(Source)
   */
  HtmlElement getHtmlElement(Source source);
  /**
   * Return the sources for the HTML files that reference the given compilation unit. If the source
   * does not represent a Dart source or is not known to this context, the returned array will be
   * empty. The contents of the array can be incomplete.
   * @param source the source referenced by the returned HTML files
   * @return the sources for the HTML files that reference the given compilation unit
   */
  List<Source> getHtmlFilesReferencing(Source source);
  /**
   * Return an array containing all of the sources known to this context that represent HTML files.
   * The contents of the array can be incomplete.
   * @return the sources known to this context that represent HTML files
   */
  List<Source> get htmlSources;
  /**
   * Return the kind of the given source, or {@code null} if the kind is not known to this context.
   * @param source the source whose kind is to be returned
   * @return the kind of the given source
   * @see #computeKindOf(Source)
   */
  SourceKind getKindOf(Source source);
  /**
   * Return an array containing all of the sources known to this context that represent the defining
   * compilation unit of a library that can be run within a browser. The sources that are returned
   * represent libraries that have a 'main' method and are either referenced by an HTML file or
   * import, directly or indirectly, a client-only library. The contents of the array can be
   * incomplete.
   * @return the sources known to this context that represent the defining compilation unit of a
   * library that can be run within a browser
   */
  List<Source> get launchableClientLibrarySources;
  /**
   * Return an array containing all of the sources known to this context that represent the defining
   * compilation unit of a library that can be run outside of a browser. The contents of the array
   * can be incomplete.
   * @return the sources known to this context that represent the defining compilation unit of a
   * library that can be run outside of a browser
   */
  List<Source> get launchableServerLibrarySources;
  /**
   * Return the sources for the defining compilation units of any libraries of which the given
   * source is a part. The array will normally contain a single library because most Dart sources
   * are only included in a single library, but it is possible to have a part that is contained in
   * multiple identically named libraries. If the source represents the defining compilation unit of
   * a library, then the returned array will contain the given source as its only element. If the
   * source does not represent a Dart source or is not known to this context, the returned array
   * will be empty. The contents of the array can be incomplete.
   * @param source the source contained in the returned libraries
   * @return the sources for the libraries containing the given source
   */
  List<Source> getLibrariesContaining(Source source);
  /**
   * Return the element model corresponding to the library defined by the given source, or{@code null} if the element model does not currently exist or if the library cannot be analyzed
   * for some reason.
   * @param source the source defining the library whose element model is to be returned
   * @return the element model corresponding to the library defined by the given source
   */
  LibraryElement getLibraryElement(Source source);
  /**
   * Return an array containing all of the sources known to this context that represent the defining
   * compilation unit of a library. The contents of the array can be incomplete.
   * @return the sources known to this context that represent the defining compilation unit of a
   * library
   */
  List<Source> get librarySources;
  /**
   * Return the line information for the given source, or {@code null} if the line information is
   * not known. The line information is used to map offsets from the beginning of the source to line
   * and column pairs.
   * @param source the source whose line information is to be returned
   * @return the line information for the given source
   * @see #computeLineInfo(Source)
   */
  LineInfo getLineInfo(Source source);
  /**
   * Return a fully resolved AST for a single compilation unit within the given library, or{@code null} if the resolved AST is not already computed.
   * @param unitSource the source of the compilation unit
   * @param library the library containing the compilation unit
   * @return a fully resolved AST for the compilation unit
   * @see #resolveCompilationUnit(Source,LibraryElement)
   */
  CompilationUnit getResolvedCompilationUnit(Source unitSource, LibraryElement library);
  /**
   * Return a fully resolved AST for a single compilation unit within the given library, or{@code null} if the resolved AST is not already computed.
   * @param unitSource the source of the compilation unit
   * @param librarySource the source of the defining compilation unit of the library containing the
   * compilation unit
   * @return a fully resolved AST for the compilation unit
   * @see #resolveCompilationUnit(Source,Source)
   */
  CompilationUnit getResolvedCompilationUnit2(Source unitSource, Source librarySource);
  /**
   * Return the source factory used to create the sources that can be analyzed in this context.
   * @return the source factory used to create the sources that can be analyzed in this context
   */
  SourceFactory get sourceFactory;
  /**
   * Return {@code true} if the given source is known to be the defining compilation unit of a
   * library that can be run on a client (references 'dart:html', either directly or indirectly).
   * <p>
   * <b>Note:</b> In addition to the expected case of returning {@code false} if the source is known
   * to be a library that cannot be run on a client, this method will also return {@code false} if
   * the source is not known to be a library or if we do not know whether it can be run on a client.
   * @param librarySource the source being tested
   * @return {@code true} if the given source is known to be a library that can be run on a client
   */
  bool isClientLibrary(Source librarySource);
  /**
   * Return {@code true} if the given source is known to be the defining compilation unit of a
   * library that can be run on the server (does not reference 'dart:html', either directly or
   * indirectly).
   * <p>
   * <b>Note:</b> In addition to the expected case of returning {@code false} if the source is known
   * to be a library that cannot be run on the server, this method will also return {@code false} if
   * the source is not known to be a library or if we do not know whether it can be run on the
   * server.
   * @param librarySource the source being tested
   * @return {@code true} if the given source is known to be a library that can be run on the server
   */
  bool isServerLibrary(Source librarySource);
  /**
   * Add the sources contained in the specified context to this context's collection of sources.
   * This method is called when an existing context's pubspec has been removed, and the contained
   * sources should be reanalyzed as part of this context.
   * @param context the context being merged
   */
  void mergeContext(AnalysisContext context);
  /**
   * Parse a single source to produce an AST structure. The resulting AST structure may or may not
   * be resolved, and may have a slightly different structure depending upon whether it is resolved.
   * @param source the source to be parsed
   * @return the AST structure representing the content of the source
   * @throws AnalysisException if the analysis could not be performed
   */
  CompilationUnit parseCompilationUnit(Source source);
  /**
   * Parse a single HTML source to produce an AST structure. The resulting HTML AST structure may or
   * may not be resolved, and may have a slightly different structure depending upon whether it is
   * resolved.
   * @param source the HTML source to be parsed
   * @return the parse result (not {@code null})
   * @throws AnalysisException if the analysis could not be performed
   */
  HtmlUnit parseHtmlUnit(Source source);
  /**
   * Perform the next unit of work required to keep the analysis results up-to-date and return
   * information about the consequent changes to the analysis results. If there were no results the
   * returned array will be empty. If there are no more units of work required, then this method
   * returns {@code null}. This method can be long running.
   * @return an array containing notices of changes to the analysis results
   */
  List<ChangeNotice> performAnalysisTask();
  /**
   * Parse and resolve a single source within the given context to produce a fully resolved AST.
   * @param unitSource the source to be parsed and resolved
   * @param library the library containing the source to be resolved
   * @return the result of resolving the AST structure representing the content of the source in the
   * context of the given library
   * @throws AnalysisException if the analysis could not be performed
   * @see #getResolvedCompilationUnit(Source,LibraryElement)
   */
  CompilationUnit resolveCompilationUnit(Source unitSource, LibraryElement library);
  /**
   * Parse and resolve a single source within the given context to produce a fully resolved AST.
   * @param unitSource the source to be parsed and resolved
   * @param librarySource the source of the defining compilation unit of the library containing the
   * source to be resolved
   * @return the result of resolving the AST structure representing the content of the source in the
   * context of the given library
   * @throws AnalysisException if the analysis could not be performed
   * @see #getResolvedCompilationUnit(Source,Source)
   */
  CompilationUnit resolveCompilationUnit2(Source unitSource, Source librarySource);
  /**
   * Parse and resolve a single source within the given context to produce a fully resolved AST.
   * @param htmlSource the source to be parsed and resolved
   * @return the result of resolving the AST structure representing the content of the source
   * @throws AnalysisException if the analysis could not be performed
   */
  HtmlUnit resolveHtmlUnit(Source htmlSource);
  /**
   * Set the contents of the given source to the given contents and mark the source as having
   * changed. 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
   */
  void setContents(Source source, String contents);
  /**
   * Set the source factory used to create the sources that can be analyzed in this context to the
   * given source factory. Clients can safely assume that all analysis results have been
   * invalidated.
   * @param factory the source factory used to create the sources that can be analyzed in this
   * context
   */
  void set sourceFactory(SourceFactory factory);
  /**
   * Given a collection of sources with content that has changed, return an {@link Iterable}identifying the sources that need to be resolved.
   * @param changedSources an array of sources (not {@code null}, contains no {@code null}s)
   * @return An iterable returning the sources to be resolved
   */
  Iterable<Source> sourcesToResolve(List<Source> changedSources);
}
/**
 * The interface {@code AnalysisErrorInfo} contains the analysis errors and line information for the
 * errors.
 */
abstract class AnalysisErrorInfo {
  /**
   * Return the errors that as a result of the analysis, or {@code null} if there were no errors.
   * @return the errors as a result of the analysis
   */
  List<AnalysisError> get errors;
  /**
   * Return the line information associated with the errors, or {@code null} if there were no
   * errors.
   * @return the line information associated with the errors
   */
  LineInfo get lineInfo;
}
/**
 * Instances of the class {@code AnalysisException} represent an exception that occurred during the
 * analysis of one or more sources.
 * @coverage dart.engine
 */
class AnalysisException extends JavaException {
  /**
   * Initialize a newly created exception.
   */
  AnalysisException() : super() {
    _jtd_constructor_125_impl();
  }
  _jtd_constructor_125_impl() {
  }
  /**
   * Initialize a newly created exception to have the given message.
   * @param message the message associated with the exception
   */
  AnalysisException.con1(String message) : super(message) {
    _jtd_constructor_126_impl(message);
  }
  _jtd_constructor_126_impl(String message) {
  }
  /**
   * Initialize a newly created exception to have the given message and cause.
   * @param message the message associated with the exception
   * @param cause the underlying exception that caused this exception
   */
  AnalysisException.con2(String message, Exception cause) : super(message, cause) {
    _jtd_constructor_127_impl(message, cause);
  }
  _jtd_constructor_127_impl(String message, Exception cause) {
  }
  /**
   * Initialize a newly created exception to have the given cause.
   * @param cause the underlying exception that caused this exception
   */
  AnalysisException.con3(Exception cause) : super.withCause(cause) {
    _jtd_constructor_128_impl(cause);
  }
  _jtd_constructor_128_impl(Exception cause) {
  }
}
/**
 * The interface {@code ChangeNotice} defines the behavior of objects that represent a change to the
 * analysis results associated with a given source.
 * @coverage dart.engine
 */
abstract class ChangeNotice implements AnalysisErrorInfo {
  /**
   * Return the fully resolved AST that changed as a result of the analysis, or {@code null} if the
   * AST was not changed.
   * @return the fully resolved AST that changed as a result of the analysis
   */
  CompilationUnit get compilationUnit;
  /**
   * Return the source for which the result is being reported.
   * @return the source for which the result is being reported
   */
  Source get source;
}
/**
 * Instances of the class {@code ChangeSet} indicate what sources have been added, changed, or
 * removed.
 * @coverage dart.engine
 */
class ChangeSet {
  /**
   * A list containing the sources that have been added.
   */
  List<Source> _added2 = new List<Source>();
  /**
   * A list containing the sources that have been changed.
   */
  List<Source> _changed2 = new List<Source>();
  /**
   * A list containing the sources that have been removed.
   */
  List<Source> _removed2 = new List<Source>();
  /**
   * A list containing the source containers specifying additional sources that have been removed.
   */
  List<SourceContainer> _removedContainers = new List<SourceContainer>();
  /**
   * Initialize a newly created change set to be empty.
   */
  ChangeSet() : super() {
  }
  /**
   * Record that the specified source has been added and that it's content is the default contents
   * of the source.
   * @param source the source that was added
   */
  void added(Source source) {
    _added2.add(source);
  }
  /**
   * Record that the specified source has been changed and that it's content is the default contents
   * of the source.
   * @param source the source that was changed
   */
  void changed(Source source) {
    _changed2.add(source);
  }
  /**
   * Return a collection of the sources that have been added.
   * @return a collection of the sources that have been added
   */
  List<Source> get added3 => _added2;
  /**
   * Return a collection of sources that have been changed.
   * @return a collection of sources that have been changed
   */
  List<Source> get changed3 => _changed2;
  /**
   * Return a list containing the sources that were removed.
   * @return a list containing the sources that were removed
   */
  List<Source> get removed => _removed2;
  /**
   * Return a list containing the source containers that were removed.
   * @return a list containing the source containers that were removed
   */
  List<SourceContainer> get removedContainers => _removedContainers;
  /**
   * Return {@code true} if this change set does not contain any changes.
   * @return {@code true} if this change set does not contain any changes
   */
  bool isEmpty() => _added2.isEmpty && _changed2.isEmpty && _removed2.isEmpty && _removedContainers.isEmpty;
  /**
   * Record that the specified source has been removed.
   * @param source the source that was removed
   */
  void removed3(Source source) {
    if (source != null) {
      _removed2.add(source);
    }
  }
  /**
   * Record that the specified source container has been removed.
   * @param container the source container that was removed
   */
  void removedContainer(SourceContainer container) {
    if (container != null) {
      _removedContainers.add(container);
    }
  }
}
/**
 * The interface {@code DartEntry} defines the behavior of objects that maintain the information
 * cached by an analysis context about an individual Dart file.
 * @coverage dart.engine
 */
abstract class DartEntry implements SourceEntry {
  /**
   * The data descriptor representing the library element for the library. This data is only
   * available for Dart files that are the defining compilation unit of a library.
   */
  static DataDescriptor<LibraryElement> ELEMENT = new DataDescriptor<LibraryElement>("DartEntry.ELEMENT");
  /**
   * The data descriptor representing the list of included parts. This data is only available for
   * Dart files that are the defining compilation unit of a library.
   */
  static DataDescriptor<List<Source>> INCLUDED_PARTS = new DataDescriptor<List<Source>>("DartEntry.INCLUDED_PARTS");
  /**
   * The data descriptor representing the client flag. This data is only available for Dart files
   * that are the defining compilation unit of a library.
   */
  static DataDescriptor<bool> IS_CLIENT = new DataDescriptor<bool>("DartEntry.IS_CLIENT");
  /**
   * The data descriptor representing the launchable flag. This data is only available for Dart
   * files that are the defining compilation unit of a library.
   */
  static DataDescriptor<bool> IS_LAUNCHABLE = new DataDescriptor<bool>("DartEntry.IS_LAUNCHABLE");
  /**
   * The data descriptor representing the errors resulting from parsing the source.
   */
  static DataDescriptor<List<AnalysisError>> PARSE_ERRORS = new DataDescriptor<List<AnalysisError>>("DartEntry.PARSE_ERRORS");
  /**
   * The data descriptor representing the parsed AST structure.
   */
  static DataDescriptor<CompilationUnit> PARSED_UNIT = new DataDescriptor<CompilationUnit>("DartEntry.PARSED_UNIT");
  /**
   * The data descriptor representing the public namespace of the library. This data is only
   * available for Dart files that are the defining compilation unit of a library.
   */
  static DataDescriptor<Namespace> PUBLIC_NAMESPACE = new DataDescriptor<Namespace>("DartEntry.PUBLIC_NAMESPACE");
  /**
   * The data descriptor representing the errors resulting from resolving the source.
   */
  static DataDescriptor<List<AnalysisError>> RESOLUTION_ERRORS = new DataDescriptor<List<AnalysisError>>("DartEntry.RESOLUTION_ERRORS");
  /**
   * The data descriptor representing the resolved AST structure.
   */
  static DataDescriptor<CompilationUnit> RESOLVED_UNIT = new DataDescriptor<CompilationUnit>("DartEntry.RESOLVED_UNIT");
  /**
   * The data descriptor representing the source kind.
   */
  static DataDescriptor<SourceKind> SOURCE_KIND = new DataDescriptor<SourceKind>("DartEntry.SOURCE_KIND");
  /**
   * Return all of the errors associated with the compilation unit that are currently cached.
   * @return all of the errors associated with the compilation unit
   */
  List<AnalysisError> get allErrors;
  /**
   * Return a valid parsed compilation unit, either an unresolved AST structure or the result of
   * resolving the AST structure in the context of some library, or {@code null} if there is no
   * parsed compilation unit available.
   * @return a valid parsed compilation unit
   */
  CompilationUnit get anyParsedCompilationUnit;
  /**
   * Return the result of resolving the compilation unit as part of any library, or {@code null} if
   * there is no cached resolved compilation unit.
   * @return any resolved compilation unit
   */
  CompilationUnit get anyResolvedCompilationUnit;
  /**
   * Return the state of the data represented by the given descriptor in the context of the given
   * library.
   * @param descriptor the descriptor representing the data whose state is to be returned
   * @param librarySource the source of the defining compilation unit of the library that is the
   * context for the data
   * @return the value of the data represented by the given descriptor and library
   */
  CacheState getState2(DataDescriptor<Object> descriptor, Source librarySource);
  /**
   * Return the value of the data represented by the given descriptor in the context of the given
   * library, or {@code null} if the data represented by the descriptor is not in the cache.
   * @param descriptor the descriptor representing which data is to be returned
   * @param librarySource the source of the defining compilation unit of the library that is the
   * context for the data
   * @return the value of the data represented by the given descriptor and library
   */
  Object getValue2(DataDescriptor descriptor, Source librarySource);
  DartEntryImpl get writableCopy;
}
/**
 * Instances of the class {@code DartEntryImpl} implement a {@link DartEntry}.
 * @coverage dart.engine
 */
class DartEntryImpl extends SourceEntryImpl implements DartEntry {
  /**
   * The state of the cached source kind.
   */
  CacheState _sourceKindState = CacheState.INVALID;
  /**
   * The kind of this source.
   */
  SourceKind _sourceKind = SourceKind.UNKNOWN;
  /**
   * The state of the cached parsed compilation unit.
   */
  CacheState _parsedUnitState = CacheState.INVALID;
  /**
   * The parsed compilation unit, or {@code null} if the parsed compilation unit is not currently
   * cached.
   */
  CompilationUnit _parsedUnit;
  /**
   * The state of the cached parse errors.
   */
  CacheState _parseErrorsState = CacheState.INVALID;
  /**
   * The errors produced while scanning and parsing the compilation unit, or {@code null} if the
   * errors are not currently cached.
   */
  List<AnalysisError> _parseErrors = AnalysisError.NO_ERRORS;
  /**
   * The state of the cached list of included parts.
   */
  CacheState _includedPartsState = CacheState.INVALID;
  /**
   * The list of parts included in the library, or {@code null} if the list is not currently cached.
   * The list will be empty if the Dart file is a part rather than a library.
   */
  List<Source> _includedParts = Source.EMPTY_ARRAY;
  /**
   * The source for the defining compilation unit of the library that contains this unit, or{@code null} if this unit is contained in multiple libraries. (If this unit is the defining
   * compilation unit for it's library, then this will be the source for this unit.)
   */
  Source _librarySource;
  /**
   * The information known as a result of resolving this compilation unit as part of the library
   * that contains this unit, or {@code null} if this unit is contained in multiple libraries.
   */
  DartEntryImpl_ResolutionState _resolutionState = new DartEntryImpl_ResolutionState();
  /**
   * A table mapping the sources of the libraries containing this compilation unit to the
   * information known as a result of resolving this compilation unit as part of the library, or{@code null} if this unit is contained in a single library.
   */
  Map<Source, DartEntryImpl_ResolutionState> _resolutionMap;
  /**
   * The state of the cached library element.
   */
  CacheState _elementState = CacheState.INVALID;
  /**
   * The element representing the library, or {@code null} if the element is not currently cached.
   */
  LibraryElement _element;
  /**
   * The state of the cached public namespace.
   */
  CacheState _publicNamespaceState = CacheState.INVALID;
  /**
   * The public namespace of the library, or {@code null} if the namespace is not currently cached.
   */
  Namespace _publicNamespace;
  /**
   * The state of the cached client/ server flag.
   */
  CacheState _clientServerState = CacheState.INVALID;
  /**
   * The state of the cached launchable flag.
   */
  CacheState _launchableState = CacheState.INVALID;
  /**
   * An integer holding bit masks such as {@link #LAUNCHABLE} and {@link #CLIENT_CODE}.
   */
  int _bitmask = 0;
  /**
   * Mask indicating that this library is launchable: that the file has a main method.
   */
  static int _LAUNCHABLE = 1 << 1;
  /**
   * Mask indicating that the library is client code: that the library depends on the html library.
   * If the library is not "client code", then it is referenced as "server code".
   */
  static int _CLIENT_CODE = 1 << 2;
  /**
   * Initialize a newly created cache entry to be empty.
   */
  DartEntryImpl() : super() {
  }
  /**
   * Record the fact that we are about to parse the compilation unit by marking the results of
   * parsing as being in progress.
   */
  void aboutToParse() {
    setState(SourceEntry.LINE_INFO, CacheState.IN_PROCESS);
    _parsedUnitState = CacheState.IN_PROCESS;
    _parseErrorsState = CacheState.IN_PROCESS;
  }
  List<AnalysisError> get allErrors {
    List<AnalysisError> errors = new List<AnalysisError>();
    for (AnalysisError error in _parseErrors) {
      errors.add(error);
    }
    if (_resolutionMap == null) {
      for (AnalysisError error in _resolutionState._resolutionErrors) {
        errors.add(error);
      }
    } else {
      for (DartEntryImpl_ResolutionState state in _resolutionMap.values) {
        for (AnalysisError error in state._resolutionErrors) {
          errors.add(error);
        }
      }
    }
    if (errors.length == 0) {
      return AnalysisError.NO_ERRORS;
    }
    return new List.from(errors);
  }
  CompilationUnit get anyParsedCompilationUnit {
    if (identical(_parsedUnitState, CacheState.VALID)) {
      return _parsedUnit;
    }
    if (_resolutionMap == null) {
      return _resolutionState._resolvedUnit;
    } else {
      for (DartEntryImpl_ResolutionState state in _resolutionMap.values) {
        if (identical(state._resolvedUnitState, CacheState.VALID)) {
          return state._resolvedUnit;
        }
      }
    }
    return null;
  }
  CompilationUnit get anyResolvedCompilationUnit {
    for (DartEntryImpl_ResolutionState state in _resolutionMap.values) {
      if (identical(state._resolvedUnitState, CacheState.VALID)) {
        return state._resolvedUnit;
      }
    }
    return null;
  }
  SourceKind get kind => _sourceKind;
  CacheState getState(DataDescriptor<Object> descriptor) {
    if (identical(descriptor, DartEntry.ELEMENT)) {
      return _elementState;
    } else if (identical(descriptor, DartEntry.INCLUDED_PARTS)) {
      return _includedPartsState;
    } else if (identical(descriptor, DartEntry.IS_CLIENT)) {
      return _clientServerState;
    } else if (identical(descriptor, DartEntry.IS_LAUNCHABLE)) {
      return _launchableState;
    } else if (identical(descriptor, DartEntry.PARSE_ERRORS)) {
      return _parseErrorsState;
    } else if (identical(descriptor, DartEntry.PARSED_UNIT)) {
      return _parsedUnitState;
    } else if (identical(descriptor, DartEntry.PUBLIC_NAMESPACE)) {
      return _publicNamespaceState;
    } else if (identical(descriptor, DartEntry.SOURCE_KIND)) {
      return _sourceKindState;
    } else {
      return super.getState(descriptor);
    }
  }
  CacheState getState2(DataDescriptor<Object> descriptor, Source librarySource) {
    if (identical(descriptor, DartEntry.RESOLUTION_ERRORS)) {
      if (_resolutionMap == null) {
        return _resolutionState._resolutionErrorsState;
      } else {
        DartEntryImpl_ResolutionState state = _resolutionMap[librarySource];
        if (state != null) {
          return state._resolutionErrorsState;
        }
      }
    } else if (identical(descriptor, DartEntry.RESOLVED_UNIT)) {
      if (_resolutionMap == null) {
        return _resolutionState._resolvedUnitState;
      } else {
        DartEntryImpl_ResolutionState state = _resolutionMap[librarySource];
        if (state != null) {
          return state._resolvedUnitState;
        }
      }
    } else {
      throw new IllegalArgumentException("Invalid descriptor: ${descriptor}");
    }
    return CacheState.INVALID;
  }
  Object getValue(DataDescriptor descriptor) {
    if (identical(descriptor, DartEntry.ELEMENT)) {
      return _element as Object;
    } else if (identical(descriptor, DartEntry.INCLUDED_PARTS)) {
      return _includedParts as Object;
    } else if (identical(descriptor, DartEntry.IS_CLIENT)) {
      return ((_bitmask & _CLIENT_CODE) != 0 ? true : false) as Object;
    } else if (identical(descriptor, DartEntry.IS_LAUNCHABLE)) {
      return ((_bitmask & _LAUNCHABLE) != 0 ? true : false) as Object;
    } else if (identical(descriptor, DartEntry.PARSE_ERRORS)) {
      return _parseErrors as Object;
    } else if (identical(descriptor, DartEntry.PARSED_UNIT)) {
      return _parsedUnit as Object;
    } else if (identical(descriptor, DartEntry.PUBLIC_NAMESPACE)) {
      return _publicNamespace as Object;
    } else if (identical(descriptor, DartEntry.SOURCE_KIND)) {
      return _sourceKind as Object;
    }
    return super.getValue(descriptor);
  }
  Object getValue2(DataDescriptor descriptor, Source librarySource2) {
    if (identical(descriptor, DartEntry.RESOLUTION_ERRORS)) {
      if (_resolutionMap == null) {
        if (librarySource2 == this._librarySource) {
          return _resolutionState._resolutionErrors as Object;
        } else {
          return AnalysisError.NO_ERRORS as Object;
        }
      } else {
        DartEntryImpl_ResolutionState state = _resolutionMap[librarySource2];
        if (state != null) {
          return state._resolutionErrors as Object;
        }
      }
    } else if (identical(descriptor, DartEntry.RESOLVED_UNIT)) {
      if (_resolutionMap == null) {
        if (librarySource2 == this._librarySource) {
          return _resolutionState._resolvedUnit as Object;
        } else {
          return null;
        }
      } else {
        DartEntryImpl_ResolutionState state = _resolutionMap[librarySource2];
        if (state != null) {
          return state._resolvedUnit as Object;
        }
      }
    } else {
      throw new IllegalArgumentException("Invalid descriptor: ${descriptor}");
    }
    return null;
  }
  DartEntryImpl get writableCopy {
    DartEntryImpl copy = new DartEntryImpl();
    copy.copyFrom(this);
    return copy;
  }
  /**
   * Invalidate all of the resolution information associated with the compilation unit.
   */
  void invalidateAllResolutionInformation() {
    if (_resolutionMap == null) {
      _resolutionState.invalidateAllResolutionInformation();
    } else {
      for (DartEntryImpl_ResolutionState state in _resolutionMap.values) {
        state.invalidateAllResolutionInformation();
      }
    }
    _elementState = CacheState.INVALID;
    _element = null;
    _publicNamespaceState = CacheState.INVALID;
    _publicNamespace = null;
    _launchableState = CacheState.INVALID;
    _clientServerState = CacheState.INVALID;
    _bitmask = 0;
  }
  /**
   * Remove any resolution information associated with this compilation unit being part of the given
   * library, presumably because it is no longer part of the library.
   * @param librarySource the source of the defining compilation unit of the library that used to
   * contain this part but no longer does
   */
  void removeResolution(Source librarySource2) {
    if (_resolutionMap == null) {
      if (librarySource2 == this._librarySource) {
        _resolutionState.invalidateAllResolutionInformation();
        this._librarySource = null;
      }
    } else {
      _resolutionMap.remove(librarySource2);
      if (_resolutionMap.length == 1) {
        MapEntry<Source, DartEntryImpl_ResolutionState> entry = new JavaIterator(getMapEntrySet(_resolutionMap)).next();
        this._librarySource = entry.getKey();
        _resolutionState = entry.getValue();
        _resolutionMap = null;
      }
    }
  }
  /**
   * Set the results of parsing the compilation unit at the given time to the given values.
   * @param modificationStamp the earliest time at which the source was last modified before the
   * parsing was started
   * @param lineInfo the line information resulting from parsing the compilation unit
   * @param unit the AST structure resulting from parsing the compilation unit
   * @param errors the parse errors resulting from parsing the compilation unit
   */
  void setParseResults(int modificationStamp, LineInfo lineInfo, CompilationUnit unit, List<AnalysisError> errors) {
    if (getState(SourceEntry.LINE_INFO) != CacheState.VALID) {
      setValue(SourceEntry.LINE_INFO, lineInfo);
    }
    if (_parsedUnitState != CacheState.VALID) {
      _parsedUnit = unit;
    }
    if (_parseErrorsState != CacheState.VALID) {
      _parseErrors = errors == null ? AnalysisError.NO_ERRORS : errors;
    }
  }
  void setState(DataDescriptor<Object> descriptor, CacheState state) {
    if (identical(descriptor, DartEntry.ELEMENT)) {
      _element = updatedValue(state, _element, null);
      _elementState = state;
    } else if (identical(descriptor, DartEntry.INCLUDED_PARTS)) {
      _includedParts = updatedValue(state, _includedParts, Source.EMPTY_ARRAY);
      _includedPartsState = state;
    } else if (identical(descriptor, DartEntry.IS_CLIENT)) {
      _bitmask = updatedValue2(state, _bitmask, _CLIENT_CODE);
      _clientServerState = state;
    } else if (identical(descriptor, DartEntry.IS_LAUNCHABLE)) {
      _bitmask = updatedValue2(state, _bitmask, _LAUNCHABLE);
      _launchableState = state;
    } else if (identical(descriptor, DartEntry.PARSE_ERRORS)) {
      _parseErrors = updatedValue(state, _parseErrors, AnalysisError.NO_ERRORS);
      _parseErrorsState = state;
    } else if (identical(descriptor, DartEntry.PARSED_UNIT)) {
      _parsedUnit = updatedValue(state, _parsedUnit, null);
      _parsedUnitState = state;
    } else if (identical(descriptor, DartEntry.PUBLIC_NAMESPACE)) {
      _publicNamespace = updatedValue(state, _publicNamespace, null);
      _publicNamespaceState = state;
    } else if (identical(descriptor, DartEntry.SOURCE_KIND)) {
      _sourceKind = updatedValue(state, _sourceKind, SourceKind.UNKNOWN);
      _sourceKindState = state;
    } else {
      super.setState(descriptor, state);
    }
  }
  /**
   * Set the state of the data represented by the given descriptor in the context of the given
   * library to the given state.
   * @param descriptor the descriptor representing the data whose state is to be set
   * @param librarySource the source of the defining compilation unit of the library that is the
   * context for the data
   * @param state the new state of the data represented by the given descriptor
   */
  void setState2(DataDescriptor<Object> descriptor, Source librarySource2, CacheState state) {
    if (_resolutionMap == null && this._librarySource != librarySource2) {
      _resolutionMap = new Map<Source, DartEntryImpl_ResolutionState>();
      _resolutionMap[this._librarySource] = _resolutionState;
      this._librarySource = null;
      _resolutionState = null;
    }
    if (identical(descriptor, DartEntry.RESOLUTION_ERRORS)) {
      if (_resolutionMap == null) {
        _resolutionState._resolutionErrors = updatedValue(state, _resolutionState._resolutionErrors, AnalysisError.NO_ERRORS);
        _resolutionState._resolutionErrorsState = state;
      } else {
        DartEntryImpl_ResolutionState resolutionState = _resolutionMap[librarySource2];
        if (resolutionState == null) {
          resolutionState = new DartEntryImpl_ResolutionState();
          _resolutionMap[librarySource2] = resolutionState;
        }
        resolutionState._resolutionErrors = updatedValue(state, resolutionState._resolutionErrors, AnalysisError.NO_ERRORS);
        resolutionState._resolutionErrorsState = state;
      }
    } else if (identical(descriptor, DartEntry.RESOLVED_UNIT)) {
      if (_resolutionMap == null) {
        _resolutionState._resolvedUnit = updatedValue(state, _resolutionState._resolvedUnit, null);
        _resolutionState._resolvedUnitState = state;
      } else {
        DartEntryImpl_ResolutionState resolutionState = _resolutionMap[librarySource2];
        if (resolutionState == null) {
          resolutionState = new DartEntryImpl_ResolutionState();
          _resolutionMap[librarySource2] = resolutionState;
        }
        resolutionState._resolvedUnit = updatedValue(state, resolutionState._resolvedUnit, null);
        resolutionState._resolvedUnitState = state;
      }
    } else {
      throw new IllegalArgumentException("Invalid descriptor: ${descriptor}");
    }
  }
  void setValue(DataDescriptor descriptor, Object value) {
    if (identical(descriptor, DartEntry.ELEMENT)) {
      _element = value as LibraryElement;
      _elementState = CacheState.VALID;
    } else if (identical(descriptor, DartEntry.INCLUDED_PARTS)) {
      _includedParts = value == null ? Source.EMPTY_ARRAY : (value as List<Source>);
      _includedPartsState = CacheState.VALID;
    } else if (identical(descriptor, DartEntry.IS_CLIENT)) {
      if (((value as bool))) {
        _bitmask |= _CLIENT_CODE;
      } else {
        _bitmask &= ~_CLIENT_CODE;
      }
      _clientServerState = CacheState.VALID;
    } else if (identical(descriptor, DartEntry.IS_LAUNCHABLE)) {
      if (((value as bool))) {
        _bitmask |= _LAUNCHABLE;
      } else {
        _bitmask &= ~_LAUNCHABLE;
      }
      _launchableState = CacheState.VALID;
    } else if (identical(descriptor, DartEntry.PARSE_ERRORS)) {
      _parseErrors = value == null ? AnalysisError.NO_ERRORS : (value as List<AnalysisError>);
      _parseErrorsState = CacheState.VALID;
    } else if (identical(descriptor, DartEntry.PARSED_UNIT)) {
      _parsedUnit = value as CompilationUnit;
      _parsedUnitState = CacheState.VALID;
    } else if (identical(descriptor, DartEntry.PUBLIC_NAMESPACE)) {
      _publicNamespace = value as Namespace;
      _publicNamespaceState = CacheState.VALID;
    } else if (identical(descriptor, DartEntry.SOURCE_KIND)) {
      _sourceKind = value as SourceKind;
      _sourceKindState = CacheState.VALID;
    } else {
      super.setValue(descriptor, value);
    }
  }
  /**
   * Set the value of the data represented by the given descriptor in the context of the given
   * library to the given value, and set the state of that data to {@link CacheState#VALID}.
   * @param descriptor the descriptor representing which data is to have its value set
   * @param librarySource the source of the defining compilation unit of the library that is the
   * context for the data
   * @param value the new value of the data represented by the given descriptor and library
   */
  void setValue2(DataDescriptor descriptor, Source librarySource2, Object value) {
    if (_resolutionMap == null) {
      if (this._librarySource == null) {
        this._librarySource = librarySource2;
      } else if (librarySource2 != this._librarySource) {
        _resolutionMap = new Map<Source, DartEntryImpl_ResolutionState>();
        _resolutionMap[this._librarySource] = _resolutionState;
        this._librarySource = null;
        _resolutionState = null;
      }
    }
    if (identical(descriptor, DartEntry.RESOLUTION_ERRORS)) {
      if (_resolutionMap == null) {
        _resolutionState._resolutionErrors = value == null ? AnalysisError.NO_ERRORS : (value as List<AnalysisError>);
        _resolutionState._resolutionErrorsState = CacheState.VALID;
      } else {
        DartEntryImpl_ResolutionState state = _resolutionMap[librarySource2];
        if (state != null) {
          state._resolutionErrors = value == null ? AnalysisError.NO_ERRORS : (value as List<AnalysisError>);
          state._resolutionErrorsState = CacheState.VALID;
        }
      }
    } else if (identical(descriptor, DartEntry.RESOLVED_UNIT)) {
      if (_resolutionMap == null) {
        _resolutionState._resolvedUnit = value as CompilationUnit;
        _resolutionState._resolvedUnitState = CacheState.VALID;
      } else {
        DartEntryImpl_ResolutionState state = _resolutionMap[librarySource2];
        if (state != null) {
          state._resolvedUnit = value as CompilationUnit;
          state._resolvedUnitState = CacheState.VALID;
        }
      }
    }
  }
  void copyFrom(SourceEntryImpl entry) {
    super.copyFrom(entry);
    DartEntryImpl other = entry as DartEntryImpl;
    _sourceKindState = other._sourceKindState;
    _sourceKind = other._sourceKind;
    _parsedUnitState = other._parsedUnitState;
    _parsedUnit = other._parsedUnit;
    _parseErrorsState = other._parseErrorsState;
    _parseErrors = other._parseErrors;
    _includedPartsState = other._includedPartsState;
    _includedParts = other._includedParts;
    if (other._resolutionMap == null) {
      _librarySource = other._librarySource;
      DartEntryImpl_ResolutionState newState = new DartEntryImpl_ResolutionState();
      newState.copyFrom(_resolutionState);
      _resolutionState = newState;
    } else {
      _resolutionMap = new Map<Source, DartEntryImpl_ResolutionState>();
      for (MapEntry<Source, DartEntryImpl_ResolutionState> mapEntry in getMapEntrySet(other._resolutionMap)) {
        DartEntryImpl_ResolutionState newState = new DartEntryImpl_ResolutionState();
        newState.copyFrom(mapEntry.getValue());
        _resolutionMap[mapEntry.getKey()] = newState;
      }
    }
    _elementState = other._elementState;
    _element = other._element;
    _publicNamespaceState = other._publicNamespaceState;
    _publicNamespace = other._publicNamespace;
    _clientServerState = other._clientServerState;
    _launchableState = other._launchableState;
    _bitmask = other._bitmask;
  }
  /**
   * Given that one of the flags is being transitioned to the given state, return the value of the
   * flags that should be kept in the cache.
   * @param state the state to which the data is being transitioned
   * @param currentValue the value of the flags before the transition
   * @param bitMask the mask used to access the bit whose state is being set
   * @return the value of the data that should be kept in the cache
   */
  int updatedValue2(CacheState state, int currentValue, int bitMask) {
    if (identical(state, CacheState.VALID)) {
      throw new IllegalArgumentException("Use setValue() to set the state to VALID");
    } else if (identical(state, CacheState.IN_PROCESS)) {
      return currentValue;
    }
    return currentValue &= ~bitMask;
  }
}
/**
 * Instances of the class {@code ResolutionState} represent the information produced by resolving
 * a compilation unit as part of a specific library.
 */
class DartEntryImpl_ResolutionState {
  /**
   * The state of the cached resolved compilation unit.
   */
  CacheState _resolvedUnitState = CacheState.INVALID;
  /**
   * The resolved compilation unit, or {@code null} if the resolved compilation unit is not
   * currently cached.
   */
  CompilationUnit _resolvedUnit;
  /**
   * The state of the cached resolution errors.
   */
  CacheState _resolutionErrorsState = CacheState.INVALID;
  /**
   * The errors produced while resolving the compilation unit, or {@code null} if the errors are
   * not currently cached.
   */
  List<AnalysisError> _resolutionErrors = AnalysisError.NO_ERRORS;
  /**
   * Initialize a newly created resolution state.
   */
  DartEntryImpl_ResolutionState() : super() {
  }
  /**
   * Set this state to be exactly like the given state.
   * @param other the state to be copied
   */
  void copyFrom(DartEntryImpl_ResolutionState other) {
    _resolvedUnitState = other._resolvedUnitState;
    _resolvedUnit = other._resolvedUnit;
    _resolutionErrorsState = other._resolutionErrorsState;
    _resolutionErrors = other._resolutionErrors;
  }
  /**
   * Invalidate all of the resolution information associated with the compilation unit.
   */
  void invalidateAllResolutionInformation() {
    _resolvedUnitState = CacheState.INVALID;
    _resolvedUnit = null;
    _resolutionErrorsState = CacheState.INVALID;
    _resolutionErrors = AnalysisError.NO_ERRORS;
  }
}
/**
 * Instances of the class {@code DataDescriptor} are immutable constants representing data that can
 * be stored in the cache.
 */
class DataDescriptor<E> {
  /**
   * The name of the descriptor, used for debugging purposes.
   */
  String _name;
  /**
   * Initialize a newly created descriptor to have the given name.
   * @param name the name of the descriptor
   */
  DataDescriptor(String name) {
    this._name = name;
  }
  String toString() => _name;
}
/**
 * The interface {@code HtmlEntry} defines the behavior of objects that maintain the information
 * cached by an analysis context about an individual HTML file.
 * @coverage dart.engine
 */
abstract class HtmlEntry implements SourceEntry {
  /**
   * The data descriptor representing the HTML element.
   */
  static DataDescriptor<HtmlElement> ELEMENT = new DataDescriptor<HtmlElement>("HtmlEntry.ELEMENT");
  /**
   * The data descriptor representing the parsed AST structure.
   */
  static DataDescriptor<HtmlUnit> PARSED_UNIT = new DataDescriptor<HtmlUnit>("HtmlEntry.PARSED_UNIT");
  /**
   * The data descriptor representing the list of referenced libraries.
   */
  static DataDescriptor<List<Source>> REFERENCED_LIBRARIES = new DataDescriptor<List<Source>>("HtmlEntry.REFERENCED_LIBRARIES");
  /**
   * The data descriptor representing the errors resulting from resolving the source.
   */
  static DataDescriptor<List<AnalysisError>> RESOLUTION_ERRORS = new DataDescriptor<List<AnalysisError>>("HtmlEntry.RESOLUTION_ERRORS");
  /**
   * The data descriptor representing the resolved AST structure.
   */
  static DataDescriptor<HtmlUnit> RESOLVED_UNIT = new DataDescriptor<HtmlUnit>("HtmlEntry.RESOLVED_UNIT");
  HtmlEntryImpl get writableCopy;
}
/**
 * Instances of the class {@code HtmlEntryImpl} implement an {@link HtmlEntry}.
 * @coverage dart.engine
 */
class HtmlEntryImpl extends SourceEntryImpl implements HtmlEntry {
  /**
   * The state of the cached parsed (but not resolved) HTML unit.
   */
  CacheState _parsedUnitState = CacheState.INVALID;
  /**
   * The parsed HTML unit, or {@code null} if the parsed HTML unit is not currently cached.
   */
  HtmlUnit _parsedUnit;
  /**
   * The state of the cached resolution errors.
   */
  CacheState _resolutionErrorsState = CacheState.INVALID;
  /**
   * The errors produced while resolving the compilation unit, or {@code null} if the errors are not
   * currently cached.
   */
  List<AnalysisError> _resolutionErrors = AnalysisError.NO_ERRORS;
  /**
   * The state of the cached parsed and resolved HTML unit.
   */
  CacheState _resolvedUnitState = CacheState.INVALID;
  /**
   * The resolved HTML unit, or {@code null} if the resolved HTML unit is not currently cached.
   */
  HtmlUnit _resolvedUnit;
  /**
   * The state of the cached list of referenced libraries.
   */
  CacheState _referencedLibrariesState = CacheState.INVALID;
  /**
   * The list of libraries referenced in the HTML, or {@code null} if the list is not currently
   * cached. Note that this list does not include libraries defined directly within the HTML file.
   */
  List<Source> _referencedLibraries = Source.EMPTY_ARRAY;
  /**
   * The state of the cached HTML element.
   */
  CacheState _elementState = CacheState.INVALID;
  /**
   * The element representing the HTML file, or {@code null} if the element is not currently cached.
   */
  HtmlElement _element;
  /**
   * Initialize a newly created cache entry to be empty.
   */
  HtmlEntryImpl() : super() {
  }
  SourceKind get kind => SourceKind.HTML;
  CacheState getState(DataDescriptor<Object> descriptor) {
    if (identical(descriptor, HtmlEntry.ELEMENT)) {
      return _elementState;
    } else if (identical(descriptor, HtmlEntry.PARSED_UNIT)) {
      return _parsedUnitState;
    } else if (identical(descriptor, HtmlEntry.REFERENCED_LIBRARIES)) {
      return _referencedLibrariesState;
    } else if (identical(descriptor, HtmlEntry.RESOLUTION_ERRORS)) {
      return _resolutionErrorsState;
    } else if (identical(descriptor, HtmlEntry.RESOLVED_UNIT)) {
      return _resolvedUnitState;
    }
    return super.getState(descriptor);
  }
  Object getValue(DataDescriptor descriptor) {
    if (identical(descriptor, HtmlEntry.ELEMENT)) {
      return _element as Object;
    } else if (identical(descriptor, HtmlEntry.PARSED_UNIT)) {
      return _parsedUnit as Object;
    } else if (identical(descriptor, HtmlEntry.REFERENCED_LIBRARIES)) {
      return _referencedLibraries as Object;
    } else if (identical(descriptor, HtmlEntry.RESOLUTION_ERRORS)) {
      return _resolutionErrors as Object;
    } else if (identical(descriptor, HtmlEntry.RESOLVED_UNIT)) {
      return _resolvedUnit as Object;
    }
    return super.getValue(descriptor);
  }
  HtmlEntryImpl get writableCopy {
    HtmlEntryImpl copy = new HtmlEntryImpl();
    copy.copyFrom(this);
    return copy;
  }
  void setState(DataDescriptor<Object> descriptor, CacheState state) {
    if (identical(descriptor, HtmlEntry.ELEMENT)) {
      _element = updatedValue(state, _element, null);
      _elementState = state;
    } else if (identical(descriptor, HtmlEntry.PARSED_UNIT)) {
      _parsedUnit = updatedValue(state, _parsedUnit, null);
      _parsedUnitState = state;
    } else if (identical(descriptor, HtmlEntry.REFERENCED_LIBRARIES)) {
      _referencedLibraries = updatedValue(state, _referencedLibraries, Source.EMPTY_ARRAY);
      _referencedLibrariesState = state;
    } else if (identical(descriptor, HtmlEntry.RESOLUTION_ERRORS)) {
      _resolutionErrors = updatedValue(state, _resolutionErrors, AnalysisError.NO_ERRORS);
      _resolutionErrorsState = state;
    } else if (identical(descriptor, HtmlEntry.RESOLVED_UNIT)) {
      _resolvedUnit = updatedValue(state, _resolvedUnit, null);
      _resolvedUnitState = state;
    } else {
      super.setState(descriptor, state);
    }
  }
  void setValue(DataDescriptor descriptor, Object value) {
    if (identical(descriptor, HtmlEntry.ELEMENT)) {
      _element = value as HtmlElement;
      _elementState = CacheState.VALID;
    } else if (identical(descriptor, HtmlEntry.PARSED_UNIT)) {
      _parsedUnit = value as HtmlUnit;
      _parsedUnitState = CacheState.VALID;
    } else if (identical(descriptor, HtmlEntry.REFERENCED_LIBRARIES)) {
      _referencedLibraries = value == null ? Source.EMPTY_ARRAY : (value as List<Source>);
      _referencedLibrariesState = CacheState.VALID;
    } else if (identical(descriptor, HtmlEntry.RESOLUTION_ERRORS)) {
      _resolutionErrors = value as List<AnalysisError>;
      _resolutionErrorsState = CacheState.VALID;
    } else if (identical(descriptor, HtmlEntry.RESOLVED_UNIT)) {
      _resolvedUnit = value as HtmlUnit;
      _resolvedUnitState = CacheState.VALID;
    } else {
      super.setValue(descriptor, value);
    }
  }
  void copyFrom(SourceEntryImpl entry) {
    super.copyFrom(entry);
    HtmlEntryImpl other = entry as HtmlEntryImpl;
    _parsedUnitState = other._parsedUnitState;
    _parsedUnit = other._parsedUnit;
    _referencedLibrariesState = other._referencedLibrariesState;
    _referencedLibraries = other._referencedLibraries;
    _resolutionErrors = other._resolutionErrors;
    _resolutionErrorsState = other._resolutionErrorsState;
    _resolvedUnitState = other._resolvedUnitState;
    _resolvedUnit = other._resolvedUnit;
    _elementState = other._elementState;
    _element = other._element;
  }
}
/**
 * The interface {@code SourceEntry} defines the behavior of objects that maintain the information
 * cached by an analysis context about an individual source, no matter what kind of source it is.
 * <p>
 * Source entries should be treated as if they were immutable unless a writable copy of the entry
 * has been obtained and has not yet been made visible to other threads.
 * @coverage dart.engine
 */
abstract class SourceEntry {
  /**
   * The data descriptor representing the line information.
   */
  static DataDescriptor<LineInfo> LINE_INFO = new DataDescriptor<LineInfo>("SourceEntry.LINE_INFO");
  /**
   * Return the kind of the source, or {@code null} if the kind is not currently cached.
   * @return the kind of the source
   */
  SourceKind get kind;
  /**
   * Return the most recent time at which the state of the source matched the state represented by
   * this entry.
   * @return the modification time of this entry
   */
  int get modificationTime;
  /**
   * Return the state of the data represented by the given descriptor.
   * @param descriptor the descriptor representing the data whose state is to be returned
   * @return the state of the data represented by the given descriptor
   */
  CacheState getState(DataDescriptor<Object> descriptor);
  /**
   * Return the value of the data represented by the given descriptor, or {@code null} if the data
   * represented by the descriptor is not in the cache.
   * @param descriptor the descriptor representing which data is to be returned
   * @return the value of the data represented by the given descriptor
   */
  Object getValue(DataDescriptor descriptor);
  /**
   * Return a new entry that is initialized to the same state as this entry but that can be
   * modified.
   * @return a writable copy of this entry
   */
  SourceEntryImpl get writableCopy;
}
/**
 * Instances of the abstract class {@code SourceEntryImpl} implement the behavior common to all{@link SourceEntry source entries}.
 * @coverage dart.engine
 */
abstract class SourceEntryImpl implements SourceEntry {
  /**
   * The most recent time at which the state of the source matched the state represented by this
   * entry.
   */
  int _modificationTime = 0;
  /**
   * The state of the cached line information.
   */
  CacheState _lineInfoState = CacheState.INVALID;
  /**
   * The line information computed for the source, or {@code null} if the line information is not
   * currently cached.
   */
  LineInfo _lineInfo;
  /**
   * Initialize a newly created cache entry to be empty.
   */
  SourceEntryImpl() : super() {
  }
  int get modificationTime => _modificationTime;
  CacheState getState(DataDescriptor<Object> descriptor) {
    if (identical(descriptor, SourceEntry.LINE_INFO)) {
      return _lineInfoState;
    } else {
      throw new IllegalArgumentException("Invalid descriptor: ${descriptor}");
    }
  }
  Object getValue(DataDescriptor descriptor) {
    if (identical(descriptor, SourceEntry.LINE_INFO)) {
      return _lineInfo as Object;
    } else {
      throw new IllegalArgumentException("Invalid descriptor: ${descriptor}");
    }
  }
  /**
   * Set the most recent time at which the state of the source matched the state represented by this
   * entry to the given time.
   * @param time the new modification time of this entry
   */
  void set modificationTime(int time) {
    _modificationTime = time;
  }
  /**
   * Set the state of the data represented by the given descriptor to the given state.
   * @param descriptor the descriptor representing the data whose state is to be set
   * @param the new state of the data represented by the given descriptor
   */
  void setState(DataDescriptor<Object> descriptor, CacheState state) {
    if (identical(descriptor, SourceEntry.LINE_INFO)) {
      _lineInfo = updatedValue(state, _lineInfo, null);
      _lineInfoState = state;
    } else {
      throw new IllegalArgumentException("Invalid descriptor: ${descriptor}");
    }
  }
  /**
   * Set the value of the data represented by the given descriptor to the given value.
   * @param descriptor the descriptor representing the data whose value is to be set
   * @param value the new value of the data represented by the given descriptor
   */
  void setValue(DataDescriptor descriptor, Object value) {
    if (identical(descriptor, SourceEntry.LINE_INFO)) {
      _lineInfo = value as LineInfo;
      _lineInfoState = CacheState.VALID;
    } else {
      throw new IllegalArgumentException("Invalid descriptor: ${descriptor}");
    }
  }
  /**
   * Copy the information from the given cache entry.
   * @param entry the cache entry from which information will be copied
   */
  void copyFrom(SourceEntryImpl entry) {
    _modificationTime = entry._modificationTime;
    _lineInfoState = entry._lineInfoState;
    _lineInfo = entry._lineInfo;
  }
  /**
   * Given that some data is being transitioned to the given state, return the value that should be
   * kept in the cache.
   * @param state the state to which the data is being transitioned
   * @param currentValue the value of the data before the transition
   * @param defaultValue the value to be used if the current value is to be removed from the cache
   * @return the value of the data that should be kept in the cache
   */
  Object updatedValue(CacheState state, Object currentValue, Object defaultValue) {
    if (identical(state, CacheState.VALID)) {
      throw new IllegalArgumentException("Use setValue() to set the state to VALID");
    } else if (identical(state, CacheState.IN_PROCESS)) {
      return currentValue;
    }
    return defaultValue;
  }
}
/**
 * Instances of the class {@code AnalysisContextImpl} implement an {@link AnalysisContext analysis
 * context}.
 * @coverage dart.engine
 */
class AnalysisContextImpl implements InternalAnalysisContext {
  /**
   * The source factory used to create the sources that can be analyzed in this context.
   */
  SourceFactory _sourceFactory;
  /**
   * A table mapping the sources known to the context to the information known about the source.
   */
  Map<Source, SourceEntry> _sourceMap = new Map<Source, SourceEntry>();
  /**
   * A table mapping sources to the change notices that are waiting to be returned related to that
   * source.
   */
  Map<Source, ChangeNoticeImpl> _pendingNotices = new Map<Source, ChangeNoticeImpl>();
  /**
   * A list containing the most recently accessed sources with the most recently used at the end of
   * the list. When more sources are added than the maximum allowed then the least recently used
   * source will be removed and will have it's cached AST structure flushed.
   */
  List<Source> _recentlyUsed = new List<Source>();
  /**
   * The object used to synchronize access to all of the caches.
   */
  Object _cacheLock = new Object();
  /**
   * The maximum number of sources for which data should be kept in the cache.
   */
  static int _MAX_CACHE_SIZE = 64;
  /**
   * The name of the 'src' attribute in a HTML tag.
   */
  static String _ATTRIBUTE_SRC = "src";
  /**
   * The name of the 'script' tag in an HTML file.
   */
  static String _TAG_SCRIPT = "script";
  /**
   * The number of times that the flushing of information from the cache has been disabled without
   * being re-enabled.
   */
  int _cacheRemovalCount = 0;
  /**
   * Initialize a newly created analysis context.
   */
  AnalysisContextImpl() : super() {
  }
  void addSourceInfo(Source source, SourceEntry info) {
    _sourceMap[source] = info;
  }
  void applyChanges(ChangeSet changeSet) {
    if (changeSet.isEmpty()) {
      return;
    }
    {
      List<Source> removedSources = new List<Source>.from(changeSet.removed);
      for (SourceContainer container in changeSet.removedContainers) {
        addSourcesInContainer(removedSources, container);
      }
      bool addedDartSource = false;
      for (Source source in changeSet.added3) {
        if (sourceAvailable(source)) {
          addedDartSource = true;
        }
      }
      for (Source source in changeSet.changed3) {
        sourceChanged(source);
      }
      for (Source source in removedSources) {
        sourceRemoved(source);
      }
      if (addedDartSource) {
        for (MapEntry<Source, SourceEntry> mapEntry in getMapEntrySet(_sourceMap)) {
          if (!mapEntry.getKey().isInSystemLibrary() && mapEntry.getValue() is DartEntry) {
            ((mapEntry.getValue() as DartEntryImpl)).invalidateAllResolutionInformation();
          }
        }
      }
    }
  }
  String computeDocumentationComment(Element element) {
    if (element == null) {
      return null;
    }
    Source source2 = element.source;
    if (source2 == null) {
      return null;
    }
    List<CharSequence> contentHolder = new List<CharSequence>(1);
    try {
      source2.getContents(new Source_ContentReceiver_5(contentHolder));
    } catch (exception) {
      throw new AnalysisException.con2("Could not get contents of ${source2.fullName}", exception);
    }
    if (contentHolder[0] == null) {
      return null;
    }
    CompilationUnit unit = parseCompilationUnit(source2);
    if (unit == null) {
      return null;
    }
    NodeLocator locator = new NodeLocator.con1(element.nameOffset);
    ASTNode nameNode = locator.searchWithin(unit);
    while (nameNode != null) {
      if (nameNode is AnnotatedNode) {
        Comment comment = ((nameNode as AnnotatedNode)).documentationComment;
        if (comment == null) {
          return null;
        }
        int offset2 = comment.offset;
        return contentHolder[0].subSequence(offset2, offset2 + comment.length).toString();
      }
      nameNode = nameNode.parent;
    }
    return null;
  }
  List<AnalysisError> computeErrors(Source source) {
    {
      SourceEntry sourceEntry = getSourceEntry(source);
      if (sourceEntry is DartEntry) {
        DartEntry dartEntry = sourceEntry as DartEntry;
        CacheState parseErrorsState = dartEntry.getState(DartEntry.PARSE_ERRORS);
        if (parseErrorsState != CacheState.VALID && parseErrorsState != CacheState.ERROR) {
          parseCompilationUnit(source);
        }
        List<Source> libraries = getLibrariesContaining(source);
        for (Source librarySource in libraries) {
          CacheState resolutionErrorsState = dartEntry.getState2(DartEntry.RESOLUTION_ERRORS, librarySource);
          if (resolutionErrorsState != CacheState.VALID && resolutionErrorsState != CacheState.ERROR) {
          }
        }
        return dartEntry.allErrors;
      } else if (sourceEntry is HtmlEntry) {
        HtmlEntry htmlEntry = sourceEntry as HtmlEntry;
        CacheState resolutionErrorsState = htmlEntry.getState(HtmlEntry.RESOLUTION_ERRORS);
        if (resolutionErrorsState != CacheState.VALID && resolutionErrorsState != CacheState.ERROR) {
          computeHtmlElement(source);
        }
        return htmlEntry.getValue(HtmlEntry.RESOLUTION_ERRORS);
      }
      return AnalysisError.NO_ERRORS;
    }
  }
  HtmlElement computeHtmlElement(Source source) {
    if (!AnalysisEngine.isHtmlFileName(source.shortName)) {
      return null;
    }
    {
      HtmlEntry htmlEntry = getHtmlEntry(source);
      if (htmlEntry == null) {
        return null;
      }
      HtmlElement element = htmlEntry.getValue(HtmlEntry.ELEMENT);
      if (element == null) {
        HtmlUnit unit = htmlEntry.getValue(HtmlEntry.RESOLVED_UNIT);
        if (unit == null) {
          unit = htmlEntry.getValue(HtmlEntry.PARSED_UNIT);
          if (unit == null) {
            unit = parseHtmlUnit(source);
          }
        }
        RecordingErrorListener listener = new RecordingErrorListener();
        HtmlUnitBuilder builder = new HtmlUnitBuilder(this, listener);
        element = builder.buildHtmlElement2(source, unit);
        List<AnalysisError> resolutionErrors = listener.getErrors2(source);
        HtmlEntryImpl htmlCopy = (htmlEntry as HtmlEntryImpl);
        htmlCopy.setValue(HtmlEntry.RESOLVED_UNIT, unit);
        htmlCopy.setValue(HtmlEntry.RESOLUTION_ERRORS, resolutionErrors);
        htmlCopy.setValue(HtmlEntry.ELEMENT, element);
        getNotice(source).setErrors(resolutionErrors, htmlCopy.getValue(SourceEntry.LINE_INFO));
      }
      return element;
    }
  }
  SourceKind computeKindOf(Source source) {
    {
      SourceEntry sourceEntry = getSourceEntry(source);
      if (sourceEntry == null) {
        return SourceKind.UNKNOWN;
      } else if (sourceEntry is DartEntry) {
        DartEntry dartEntry = sourceEntry as DartEntry;
        CacheState sourceKindState = dartEntry.getState(DartEntry.SOURCE_KIND);
        if (sourceKindState != CacheState.VALID && sourceKindState != CacheState.ERROR) {
          internalComputeKindOf(source);
        }
      }
      return sourceEntry.kind;
    }
  }
  LibraryElement computeLibraryElement(Source source) {
    if (!AnalysisEngine.isDartFileName(source.shortName)) {
      return null;
    }
    {
      DartEntry dartEntry = getDartEntry(source);
      if (dartEntry == null) {
        return null;
      }
      LibraryElement element = dartEntry.getValue(DartEntry.ELEMENT);
      if (element == null) {
        if (computeKindOf(source) != SourceKind.LIBRARY) {
          throw new AnalysisException.con1("Cannot compute library element for non-library: ${source.fullName}");
        }
        LibraryResolver resolver = new LibraryResolver.con1(this);
        try {
          element = resolver.resolveLibrary(source, true);
          if (element != null) {
            ((dartEntry as DartEntryImpl)).setValue(DartEntry.ELEMENT, element);
          }
        } on AnalysisException catch (exception) {
          AnalysisEngine.instance.logger.logError2("Could not resolve the library ${source.fullName}", exception);
        }
      }
      return element;
    }
  }
  LineInfo computeLineInfo(Source source) {
    {
      SourceEntry sourceEntry = getSourceEntry(source);
      if (sourceEntry == null) {
        return null;
      }
      LineInfo lineInfo = sourceEntry.getValue(SourceEntry.LINE_INFO);
      if (lineInfo == null) {
        if (sourceEntry is HtmlEntry) {
          parseHtmlUnit(source);
          lineInfo = sourceEntry.getValue(SourceEntry.LINE_INFO);
        } else if (sourceEntry is DartEntry) {
          parseCompilationUnit(source);
          lineInfo = sourceEntry.getValue(SourceEntry.LINE_INFO);
        }
      }
      return lineInfo;
    }
  }
  CompilationUnit computeResolvableCompilationUnit(Source source) {
    {
      DartEntry dartEntry = getDartEntry(source);
      if (dartEntry == null) {
        return null;
      }
      CompilationUnit unit = dartEntry.anyParsedCompilationUnit;
      if (unit != null) {
        return unit.accept(new ASTCloner()) as CompilationUnit;
      }
      unit = internalParseCompilationUnit(((dartEntry as DartEntryImpl)), source);
      ((dartEntry as DartEntryImpl)).setState(DartEntry.PARSED_UNIT, CacheState.FLUSHED);
      return unit;
    }
  }
  AnalysisContext extractContext(SourceContainer container) => extractContextInto(container, (AnalysisEngine.instance.createAnalysisContext() as AnalysisContextImpl));
  InternalAnalysisContext extractContextInto(SourceContainer container, InternalAnalysisContext newContext) {
    List<Source> sourcesToRemove = new List<Source>();
    {
      for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(_sourceMap)) {
        Source source = entry.getKey();
        if (container.contains(source)) {
          sourcesToRemove.add(source);
          newContext.addSourceInfo(source, entry.getValue().writableCopy);
        }
      }
    }
    return newContext;
  }
  Element getElement(ElementLocation location) {
    List<String> components2 = ((location as ElementLocationImpl)).components;
    ElementImpl element;
    {
      Source librarySource = _sourceFactory.fromEncoding(components2[0]);
      try {
        element = computeLibraryElement(librarySource) as ElementImpl;
      } on AnalysisException catch (exception) {
        return null;
      }
    }
    for (int i = 1; i < components2.length; i++) {
      if (element == null) {
        return null;
      }
      element = element.getChild(components2[i]);
    }
    return element;
  }
  AnalysisErrorInfo getErrors(Source source) {
    {
      SourceEntry sourceEntry = getSourceEntry(source);
      if (sourceEntry is DartEntry) {
        DartEntry dartEntry = sourceEntry as DartEntry;
        return new AnalysisErrorInfoImpl(dartEntry.allErrors, dartEntry.getValue(SourceEntry.LINE_INFO));
      } else if (sourceEntry is HtmlEntry) {
        HtmlEntry htmlEntry = sourceEntry as HtmlEntry;
        return new AnalysisErrorInfoImpl(htmlEntry.getValue(HtmlEntry.RESOLUTION_ERRORS), htmlEntry.getValue(SourceEntry.LINE_INFO));
      }
      return new AnalysisErrorInfoImpl(AnalysisError.NO_ERRORS, sourceEntry.getValue(SourceEntry.LINE_INFO));
    }
  }
  HtmlElement getHtmlElement(Source source) {
    {
      SourceEntry sourceEntry = getSourceEntry(source);
      if (sourceEntry is HtmlEntry) {
        return ((sourceEntry as HtmlEntry)).getValue(HtmlEntry.ELEMENT);
      }
      return null;
    }
  }
  List<Source> getHtmlFilesReferencing(Source source) {
    {
      List<Source> htmlSources = new List<Source>();
      while (true) {
        if (getKindOf(source) == SourceKind.LIBRARY) {
        } else if (getKindOf(source) == SourceKind.PART) {
          List<Source> librarySources = getLibrariesContaining(source);
          for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(_sourceMap)) {
            if (identical(entry.getValue().kind, SourceKind.HTML)) {
              List<Source> referencedLibraries = ((entry.getValue() as HtmlEntry)).getValue(HtmlEntry.REFERENCED_LIBRARIES);
              if (containsAny(referencedLibraries, librarySources)) {
                htmlSources.add(entry.getKey());
              }
            }
          }
        }
        break;
      }
      if (htmlSources.isEmpty) {
        return Source.EMPTY_ARRAY;
      }
      return new List.from(htmlSources);
    }
  }
  List<Source> get htmlSources => getSources(SourceKind.HTML);
  SourceKind getKindOf(Source source) {
    {
      SourceEntry sourceEntry = getSourceEntry(source);
      if (sourceEntry == null) {
        return SourceKind.UNKNOWN;
      }
      return sourceEntry.kind;
    }
  }
  List<Source> get launchableClientLibrarySources {
    List<Source> sources = new List<Source>();
    {
      for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(_sourceMap)) {
        Source source = entry.getKey();
        SourceEntry sourceEntry = entry.getValue();
        if (identical(sourceEntry.kind, SourceKind.LIBRARY) && !source.isInSystemLibrary()) {
          sources.add(source);
        }
      }
    }
    return new List.from(sources);
  }
  List<Source> get launchableServerLibrarySources {
    List<Source> sources = new List<Source>();
    {
      for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(_sourceMap)) {
        Source source = entry.getKey();
        SourceEntry sourceEntry = entry.getValue();
        if (identical(sourceEntry.kind, SourceKind.LIBRARY) && !source.isInSystemLibrary()) {
          sources.add(source);
        }
      }
    }
    return new List.from(sources);
  }
  List<Source> getLibrariesContaining(Source source) {
    {
      List<Source> librarySources = new List<Source>();
      for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(_sourceMap)) {
        if (identical(entry.getValue().kind, SourceKind.LIBRARY)) {
          if (contains(((entry.getValue() as DartEntry)).getValue(DartEntry.INCLUDED_PARTS), source)) {
            librarySources.add(entry.getKey());
          }
        }
      }
      if (librarySources.isEmpty) {
        return Source.EMPTY_ARRAY;
      }
      return new List.from(librarySources);
    }
  }
  LibraryElement getLibraryElement(Source source) {
    {
      SourceEntry sourceEntry = getSourceEntry(source);
      if (sourceEntry is DartEntry) {
        return ((sourceEntry as DartEntry)).getValue(DartEntry.ELEMENT);
      }
      return null;
    }
  }
  List<Source> get librarySources => getSources(SourceKind.LIBRARY);
  LineInfo getLineInfo(Source source) {
    {
      SourceEntry sourceEntry = getSourceEntry(source);
      if (sourceEntry != null) {
        return sourceEntry.getValue(SourceEntry.LINE_INFO);
      }
      return null;
    }
  }
  Namespace getPublicNamespace(LibraryElement library) {
    Source source2 = library.definingCompilationUnit.source;
    {
      DartEntry dartEntry = getDartEntry(source2);
      if (dartEntry == null) {
        return null;
      }
      Namespace namespace = dartEntry.getValue(DartEntry.PUBLIC_NAMESPACE);
      if (namespace == null) {
        NamespaceBuilder builder = new NamespaceBuilder();
        namespace = builder.createPublicNamespace(library);
        ((dartEntry as DartEntryImpl)).setValue(DartEntry.PUBLIC_NAMESPACE, namespace);
      }
      return namespace;
    }
  }
  Namespace getPublicNamespace2(Source source) {
    {
      DartEntry dartEntry = getDartEntry(source);
      if (dartEntry == null) {
        return null;
      }
      Namespace namespace = dartEntry.getValue(DartEntry.PUBLIC_NAMESPACE);
      if (namespace == null) {
        LibraryElement library = computeLibraryElement(source);
        if (library == null) {
          return null;
        }
        NamespaceBuilder builder = new NamespaceBuilder();
        namespace = builder.createPublicNamespace(library);
        ((dartEntry as DartEntryImpl)).setValue(DartEntry.PUBLIC_NAMESPACE, namespace);
      }
      return namespace;
    }
  }
  CompilationUnit getResolvedCompilationUnit(Source unitSource, LibraryElement library) {
    if (library == null) {
      return null;
    }
    return getResolvedCompilationUnit2(unitSource, library.source);
  }
  CompilationUnit getResolvedCompilationUnit2(Source unitSource, Source librarySource) {
    {
      accessed(unitSource);
      DartEntry dartEntry = getDartEntry(unitSource);
      if (dartEntry == null) {
        return null;
      }
      return dartEntry.getValue2(DartEntry.RESOLVED_UNIT, librarySource);
    }
  }
  SourceFactory get sourceFactory => _sourceFactory;
  bool isClientLibrary(Source librarySource) {
    SourceEntry sourceEntry = getSourceEntry(librarySource);
    if (sourceEntry is DartEntry) {
      DartEntry dartEntry = sourceEntry as DartEntry;
      CacheState isClientState = dartEntry.getState(DartEntry.IS_CLIENT);
      CacheState isLaunchableState = dartEntry.getState(DartEntry.IS_LAUNCHABLE);
      if (identical(isClientState, CacheState.INVALID) || identical(isClientState, CacheState.ERROR) || identical(isLaunchableState, CacheState.INVALID) || identical(isLaunchableState, CacheState.ERROR)) {
        return false;
      }
      return dartEntry.getValue(DartEntry.IS_CLIENT) && dartEntry.getValue(DartEntry.IS_LAUNCHABLE);
    }
    return false;
  }
  bool isServerLibrary(Source librarySource) {
    SourceEntry sourceEntry = getSourceEntry(librarySource);
    if (sourceEntry is DartEntry) {
      DartEntry dartEntry = sourceEntry as DartEntry;
      CacheState isClientState = dartEntry.getState(DartEntry.IS_CLIENT);
      CacheState isLaunchableState = dartEntry.getState(DartEntry.IS_LAUNCHABLE);
      if (identical(isClientState, CacheState.INVALID) || identical(isClientState, CacheState.ERROR) || identical(isLaunchableState, CacheState.INVALID) || identical(isLaunchableState, CacheState.ERROR)) {
        return false;
      }
      return !dartEntry.getValue(DartEntry.IS_CLIENT) && dartEntry.getValue(DartEntry.IS_LAUNCHABLE);
    }
    return false;
  }
  void mergeContext(AnalysisContext context) {
    {
      for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(((context as AnalysisContextImpl))._sourceMap)) {
        Source newSource = entry.getKey();
        SourceEntry existingEntry = getSourceEntry(newSource);
        if (existingEntry == null) {
          _sourceMap[newSource] = entry.getValue().writableCopy;
        } else {
        }
      }
    }
  }
  CompilationUnit parseCompilationUnit(Source source) {
    {
      accessed(source);
      DartEntry dartEntry = getDartEntry(source);
      if (dartEntry == null) {
        return null;
      }
      CompilationUnit unit = dartEntry.anyParsedCompilationUnit;
      if (unit == null) {
        unit = internalParseCompilationUnit((dartEntry as DartEntryImpl), source);
      }
      return unit;
    }
  }
  HtmlUnit parseHtmlUnit(Source source) {
    {
      accessed(source);
      HtmlEntry htmlEntry = getHtmlEntry(source);
      if (htmlEntry == null) {
        return null;
      }
      HtmlUnit unit = htmlEntry.getValue(HtmlEntry.RESOLVED_UNIT);
      if (unit == null) {
        unit = htmlEntry.getValue(HtmlEntry.PARSED_UNIT);
        if (unit == null) {
          HtmlParseResult result = new HtmlParser(source).parse(scanHtml(source));
          unit = result.htmlUnit;
          ((htmlEntry as HtmlEntryImpl)).setValue(SourceEntry.LINE_INFO, new LineInfo(result.lineStarts));
          ((htmlEntry as HtmlEntryImpl)).setValue(HtmlEntry.PARSED_UNIT, unit);
          ((htmlEntry as HtmlEntryImpl)).setValue(HtmlEntry.REFERENCED_LIBRARIES, getLibrarySources2(source, unit));
        }
      }
      return unit;
    }
  }
  List<ChangeNotice> performAnalysisTask() {
    {
      if (!performSingleAnalysisTask() && _pendingNotices.isEmpty) {
        return null;
      }
      if (_pendingNotices.isEmpty) {
        return ChangeNoticeImpl.EMPTY_ARRAY;
      }
      List<ChangeNotice> notices = new List.from(_pendingNotices.values);
      _pendingNotices.clear();
      return notices;
    }
  }
  void recordLibraryElements(Map<Source, LibraryElement> elementMap) {
    Source htmlSource = _sourceFactory.forUri("dart:html");
    {
      for (MapEntry<Source, LibraryElement> entry in getMapEntrySet(elementMap)) {
        Source librarySource = entry.getKey();
        LibraryElement library = entry.getValue();
        DartEntryImpl dartEntry = getDartEntry(librarySource) as DartEntryImpl;
        if (dartEntry != null) {
          dartEntry.setValue(DartEntry.ELEMENT, library);
          dartEntry.setValue(DartEntry.IS_LAUNCHABLE, library.entryPoint != null);
          dartEntry.setValue(DartEntry.IS_CLIENT, isClient(library, htmlSource, new Set<LibraryElement>()));
          List<Source> unitSources = new List<Source>();
          unitSources.add(librarySource);
          for (CompilationUnitElement part in library.parts) {
            Source partSource = part.source;
            unitSources.add(partSource);
          }
          dartEntry.setValue(DartEntry.INCLUDED_PARTS, new List.from(unitSources));
        }
      }
    }
  }
  void recordResolutionErrors(Source source, Source librarySource, List<AnalysisError> errors, LineInfo lineInfo) {
    {
      DartEntryImpl dartEntry = getDartEntry(source) as DartEntryImpl;
      if (dartEntry != null) {
        dartEntry.setValue(SourceEntry.LINE_INFO, lineInfo);
        dartEntry.setValue2(DartEntry.RESOLUTION_ERRORS, librarySource, errors);
      }
      getNotice(source).setErrors(dartEntry.allErrors, lineInfo);
    }
  }
  void recordResolvedCompilationUnit(Source source, Source librarySource, CompilationUnit unit) {
    {
      DartEntryImpl dartEntry = getDartEntry(source) as DartEntryImpl;
      if (dartEntry != null) {
        dartEntry.setValue2(DartEntry.RESOLVED_UNIT, librarySource, unit);
        dartEntry.setState(DartEntry.PARSED_UNIT, CacheState.FLUSHED);
        getNotice(source).compilationUnit = unit;
      }
    }
  }
  CompilationUnit resolveCompilationUnit(Source source2, LibraryElement library) {
    if (library == null) {
      return null;
    }
    return resolveCompilationUnit2(source2, library.source);
  }
  CompilationUnit resolveCompilationUnit2(Source unitSource, Source librarySource) {
    {
      accessed(unitSource);
      DartEntry dartEntry = getDartEntry(unitSource);
      if (dartEntry == null) {
        return null;
      }
      CompilationUnit unit = dartEntry.getValue2(DartEntry.RESOLVED_UNIT, librarySource);
      if (unit == null) {
        disableCacheRemoval();
        try {
          LibraryElement libraryElement = computeLibraryElement(librarySource);
          unit = dartEntry.getValue2(DartEntry.RESOLVED_UNIT, librarySource);
          if (unit == null && libraryElement != null) {
            Source coreLibrarySource = libraryElement.context.sourceFactory.forUri(DartSdk.DART_CORE);
            LibraryElement coreElement = computeLibraryElement(coreLibrarySource);
            TypeProvider typeProvider = new TypeProviderImpl(coreElement);
            CompilationUnit unitAST = computeResolvableCompilationUnit(unitSource);
            new DeclarationResolver().resolve(unitAST, find(libraryElement, unitSource));
            RecordingErrorListener errorListener = new RecordingErrorListener();
            TypeResolverVisitor typeResolverVisitor = new TypeResolverVisitor.con2(libraryElement, unitSource, typeProvider, errorListener);
            unitAST.accept(typeResolverVisitor);
            ResolverVisitor resolverVisitor = new ResolverVisitor.con2(libraryElement, unitSource, typeProvider, errorListener);
            unitAST.accept(resolverVisitor);
            ErrorReporter errorReporter = new ErrorReporter(errorListener, unitSource);
            ErrorVerifier errorVerifier = new ErrorVerifier(errorReporter, libraryElement, typeProvider);
            unitAST.accept(errorVerifier);
            ConstantVerifier constantVerifier = new ConstantVerifier(errorReporter);
            unitAST.accept(constantVerifier);
            unitAST.resolutionErrors = errorListener.errors;
            ((dartEntry as DartEntryImpl)).setValue2(DartEntry.RESOLVED_UNIT, librarySource, unitAST);
            unit = unitAST;
          }
        } finally {
          enableCacheRemoval();
        }
      }
      return unit;
    }
  }
  HtmlUnit resolveHtmlUnit(Source unitSource) {
    {
      accessed(unitSource);
      HtmlEntry htmlEntry = getHtmlEntry(unitSource);
      if (htmlEntry == null) {
        return null;
      }
      HtmlUnit unit = htmlEntry.getValue(HtmlEntry.RESOLVED_UNIT);
      if (unit == null) {
        disableCacheRemoval();
        try {
          computeHtmlElement(unitSource);
          unit = htmlEntry.getValue(HtmlEntry.RESOLVED_UNIT);
          if (unit == null) {
            unit = parseHtmlUnit(unitSource);
          }
        } finally {
          enableCacheRemoval();
        }
      }
      return unit;
    }
  }
  void setContents(Source source, String contents) {
    {
      _sourceFactory.setContents(source, contents);
      sourceChanged(source);
    }
  }
  void set sourceFactory(SourceFactory factory) {
    if (identical(_sourceFactory, factory)) {
      return;
    } else if (factory.context != null) {
      throw new IllegalStateException("Source factories cannot be shared between contexts");
    }
    {
      if (_sourceFactory != null) {
        _sourceFactory.context = null;
      }
      factory.context = this;
      _sourceFactory = factory;
      for (SourceEntry sourceEntry in _sourceMap.values) {
        if (sourceEntry is HtmlEntry) {
          ((sourceEntry as HtmlEntryImpl)).setState(HtmlEntry.RESOLVED_UNIT, CacheState.INVALID);
        } else if (sourceEntry is DartEntry) {
          ((sourceEntry as DartEntryImpl)).invalidateAllResolutionInformation();
        }
      }
    }
  }
  Iterable<Source> sourcesToResolve(List<Source> changedSources) {
    List<Source> librarySources = new List<Source>();
    for (Source source in changedSources) {
      if (identical(computeKindOf(source), SourceKind.LIBRARY)) {
        librarySources.add(source);
      }
    }
    return librarySources;
  }
  /**
   * Record that the given source was just accessed for some unspecified purpose.
   * <p>
   * Note: This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @param source the source that was accessed
   */
  void accessed(Source source) {
    if (_recentlyUsed.contains(source)) {
      _recentlyUsed.remove(source);
      _recentlyUsed.add(source);
      return;
    }
    if (_cacheRemovalCount == 0 && _recentlyUsed.length >= _MAX_CACHE_SIZE) {
      Source removedSource = _recentlyUsed.removeAt(0);
      SourceEntry sourceEntry = _sourceMap[removedSource];
      if (sourceEntry is HtmlEntry) {
        ((sourceEntry as HtmlEntryImpl)).setState(HtmlEntry.PARSED_UNIT, CacheState.FLUSHED);
        ((sourceEntry as HtmlEntryImpl)).setState(HtmlEntry.RESOLVED_UNIT, CacheState.FLUSHED);
      } else if (sourceEntry is DartEntry) {
        ((sourceEntry as DartEntryImpl)).setState(DartEntry.PARSED_UNIT, CacheState.FLUSHED);
        for (Source librarySource in getLibrariesContaining(source)) {
          ((sourceEntry as DartEntryImpl)).setState2(DartEntry.RESOLVED_UNIT, librarySource, CacheState.FLUSHED);
        }
      }
    }
    _recentlyUsed.add(source);
  }
  /**
   * Add all of the sources contained in the given source container to the given list of sources.
   * <p>
   * Note: This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @param sources the list to which sources are to be added
   * @param container the source container containing the sources to be added to the list
   */
  void addSourcesInContainer(List<Source> sources, SourceContainer container) {
    for (Source source in _sourceMap.keys.toSet()) {
      if (container.contains(source)) {
        sources.add(source);
      }
    }
  }
  /**
   * Return {@code true} if the given array of sources contains the given source.
   * @param sources the sources being searched
   * @param targetSource the source being searched for
   * @return {@code true} if the given source is in the array
   */
  bool contains(List<Source> sources, Source targetSource) {
    for (Source source in sources) {
      if (source == targetSource) {
        return true;
      }
    }
    return false;
  }
  /**
   * Return {@code true} if the given array of sources contains any of the given target sources.
   * @param sources the sources being searched
   * @param targetSources the sources being searched for
   * @return {@code true} if any of the given target sources are in the array
   */
  bool containsAny(List<Source> sources, List<Source> targetSources) {
    for (Source targetSource in targetSources) {
      if (contains(sources, targetSource)) {
        return true;
      }
    }
    return false;
  }
  /**
   * Create a source information object suitable for the given source. Return the source information
   * object that was created, or {@code null} if the source should not be tracked by this context.
   * @param source the source for which an information object is being created
   * @return the source information object that was created
   */
  SourceEntry createSourceEntry(Source source) {
    String name = source.shortName;
    if (AnalysisEngine.isHtmlFileName(name)) {
      HtmlEntry htmlEntry = new HtmlEntryImpl();
      _sourceMap[source] = htmlEntry;
      return htmlEntry;
    } else if (AnalysisEngine.isDartFileName(name)) {
      DartEntry dartEntry = new DartEntryImpl();
      _sourceMap[source] = dartEntry;
      return dartEntry;
    }
    return null;
  }
  /**
   * Disable flushing information from the cache until {@link #enableCacheRemoval()} has been
   * called.
   */
  void disableCacheRemoval() {
    _cacheRemovalCount++;
  }
  /**
   * Re-enable flushing information from the cache.
   */
  void enableCacheRemoval() {
    if (_cacheRemovalCount > 0) {
      _cacheRemovalCount--;
    }
    if (_cacheRemovalCount == 0) {
      while (_recentlyUsed.length >= _MAX_CACHE_SIZE) {
        Source removedSource = _recentlyUsed.removeAt(0);
        SourceEntry sourceEntry = _sourceMap[removedSource];
        if (sourceEntry is HtmlEntry) {
          ((sourceEntry as HtmlEntryImpl)).setState(HtmlEntry.PARSED_UNIT, CacheState.FLUSHED);
          ((sourceEntry as HtmlEntryImpl)).setState(HtmlEntry.RESOLVED_UNIT, CacheState.FLUSHED);
        } else if (sourceEntry is DartEntry) {
          ((sourceEntry as DartEntryImpl)).setState(DartEntry.PARSED_UNIT, CacheState.FLUSHED);
          for (Source librarySource in getLibrariesContaining(removedSource)) {
            ((sourceEntry as DartEntryImpl)).setState2(DartEntry.RESOLVED_UNIT, librarySource, CacheState.FLUSHED);
          }
        }
      }
    }
  }
  /**
   * Search the compilation units that are part of the given library and return the element
   * representing the compilation unit with the given source. Return {@code null} if there is no
   * such compilation unit.
   * @param libraryElement the element representing the library being searched through
   * @param unitSource the source for the compilation unit whose element is to be returned
   * @return the element representing the compilation unit
   */
  CompilationUnitElement find(LibraryElement libraryElement, Source unitSource) {
    CompilationUnitElement element = libraryElement.definingCompilationUnit;
    if (element.source == unitSource) {
      return element;
    }
    for (CompilationUnitElement partElement in libraryElement.parts) {
      if (partElement.source == unitSource) {
        return partElement;
      }
    }
    return null;
  }
  /**
   * Return the compilation unit information associated with the given source, or {@code null} if
   * the source is not known to this context. This method should be used to access the compilation
   * unit information rather than accessing the compilation unit map directly because sources in the
   * SDK are implicitly part of every analysis context and are therefore only added to the map when
   * first accessed.
   * <p>
   * <b>Note:</b> This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @param source the source for which information is being sought
   * @return the compilation unit information associated with the given source
   */
  DartEntry getDartEntry(Source source) {
    SourceEntry sourceEntry = getSourceEntry(source);
    if (sourceEntry == null) {
      sourceEntry = new DartEntryImpl();
      _sourceMap[source] = sourceEntry;
      return sourceEntry as DartEntry;
    } else if (sourceEntry is DartEntry) {
      return sourceEntry as DartEntry;
    }
    return null;
  }
  /**
   * Return the HTML unit information associated with the given source, or {@code null} if the
   * source is not known to this context. This method should be used to access the HTML unit
   * information rather than accessing the HTML unit map directly because sources in the SDK are
   * implicitly part of every analysis context and are therefore only added to the map when first
   * accessed.
   * <p>
   * <b>Note:</b> This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @param source the source for which information is being sought
   * @return the HTML unit information associated with the given source
   */
  HtmlEntry getHtmlEntry(Source source) {
    SourceEntry sourceEntry = getSourceEntry(source);
    if (sourceEntry == null) {
      sourceEntry = new HtmlEntryImpl();
      _sourceMap[source] = sourceEntry;
      return sourceEntry as HtmlEntry;
    } else if (sourceEntry is HtmlEntry) {
      return sourceEntry as HtmlEntry;
    }
    return null;
  }
  /**
   * Return the sources of libraries that are referenced in the specified HTML file.
   * @param htmlSource the source of the HTML file being analyzed
   * @param htmlUnit the AST for the HTML file being analyzed
   * @return the sources of libraries that are referenced in the HTML file
   */
  List<Source> getLibrarySources2(Source htmlSource, HtmlUnit htmlUnit) {
    List<Source> libraries = new List<Source>();
    htmlUnit.accept(new RecursiveXmlVisitor_6(this, htmlSource, libraries));
    if (libraries.isEmpty) {
      return Source.EMPTY_ARRAY;
    }
    return new List.from(libraries);
  }
  /**
   * Return a change notice for the given source, creating one if one does not already exist.
   * @param source the source for which changes are being reported
   * @return a change notice for the given source
   */
  ChangeNoticeImpl getNotice(Source source) {
    ChangeNoticeImpl notice = _pendingNotices[source];
    if (notice == null) {
      notice = new ChangeNoticeImpl(source);
      _pendingNotices[source] = notice;
    }
    return notice;
  }
  /**
   * Return the source information associated with the given source, or {@code null} if the source
   * is not known to this context. This method should be used to access the source information
   * rather than accessing the source map directly because sources in the SDK are implicitly part of
   * every analysis context and are therefore only added to the map when first accessed.
   * <p>
   * <b>Note:</b> This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @param source the source for which information is being sought
   * @return the source information associated with the given source
   */
  SourceEntry getSourceEntry(Source source) {
    SourceEntry sourceEntry = _sourceMap[source];
    if (sourceEntry == null) {
      sourceEntry = createSourceEntry(source);
    }
    return sourceEntry;
  }
  /**
   * Return an array containing all of the sources known to this context that have the given kind.
   * @param kind the kind of sources to be returned
   * @return all of the sources known to this context that have the given kind
   */
  List<Source> getSources(SourceKind kind2) {
    List<Source> sources = new List<Source>();
    {
      for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(_sourceMap)) {
        if (identical(entry.getValue().kind, kind2)) {
          sources.add(entry.getKey());
        }
      }
    }
    return new List.from(sources);
  }
  /**
   * Return {@code true} if the given compilation unit has a part-of directive but no library
   * directive.
   * @param unit the compilation unit being tested
   * @return {@code true} if the compilation unit has a part-of directive
   */
  bool hasPartOfDirective(CompilationUnit unit) {
    bool hasPartOf = false;
    for (Directive directive in unit.directives) {
      if (directive is PartOfDirective) {
        hasPartOf = true;
      } else if (directive is LibraryDirective) {
        return false;
      }
    }
    return hasPartOf;
  }
  /**
   * Compute the kind of the given source. This method should only be invoked when the kind is not
   * already known.
   * @param source the source for which a kind is to be computed
   * @return the new source info that was created to represent the source
   */
  DartEntry internalComputeKindOf(Source source) {
    try {
      accessed(source);
      RecordingErrorListener errorListener = new RecordingErrorListener();
      AnalysisContextImpl_ScanResult scanResult = internalScan(source, errorListener);
      Parser parser = new Parser(source, errorListener);
      CompilationUnit unit = parser.parseCompilationUnit(scanResult._token);
      LineInfo lineInfo = new LineInfo(scanResult._lineStarts);
      List<AnalysisError> errors = errorListener.getErrors2(source);
      unit.parsingErrors = errors;
      unit.lineInfo = lineInfo;
      DartEntryImpl dartEntry = _sourceMap[source] as DartEntryImpl;
      if (hasPartOfDirective(unit)) {
        dartEntry.setValue(DartEntry.SOURCE_KIND, SourceKind.PART);
      } else {
        dartEntry.setValue(DartEntry.SOURCE_KIND, SourceKind.LIBRARY);
      }
      dartEntry.setValue(SourceEntry.LINE_INFO, lineInfo);
      dartEntry.setValue(DartEntry.PARSED_UNIT, unit);
      dartEntry.setValue(DartEntry.PARSE_ERRORS, errors);
      return dartEntry;
    } on AnalysisException catch (exception) {
      DartEntryImpl dartEntry = _sourceMap[source] as DartEntryImpl;
      dartEntry.setState(DartEntry.SOURCE_KIND, CacheState.ERROR);
      dartEntry.setState(SourceEntry.LINE_INFO, CacheState.ERROR);
      dartEntry.setState(DartEntry.PARSED_UNIT, CacheState.ERROR);
      dartEntry.setState(DartEntry.PARSE_ERRORS, CacheState.ERROR);
      return dartEntry;
    }
  }
  CompilationUnit internalParseCompilationUnit(DartEntryImpl dartEntry, Source source) {
    accessed(source);
    RecordingErrorListener errorListener = new RecordingErrorListener();
    AnalysisContextImpl_ScanResult scanResult = internalScan(source, errorListener);
    Parser parser = new Parser(source, errorListener);
    CompilationUnit unit = parser.parseCompilationUnit(scanResult._token);
    LineInfo lineInfo = new LineInfo(scanResult._lineStarts);
    List<AnalysisError> errors = errorListener.getErrors2(source);
    unit.parsingErrors = errors;
    unit.lineInfo = lineInfo;
    if (identical(dartEntry.getState(DartEntry.SOURCE_KIND), CacheState.INVALID)) {
      if (hasPartOfDirective(unit)) {
        dartEntry.setValue(DartEntry.SOURCE_KIND, SourceKind.PART);
      } else {
        dartEntry.setValue(DartEntry.SOURCE_KIND, SourceKind.LIBRARY);
      }
    }
    dartEntry.setValue(SourceEntry.LINE_INFO, lineInfo);
    dartEntry.setValue(DartEntry.PARSED_UNIT, unit);
    dartEntry.setValue(DartEntry.PARSE_ERRORS, errors);
    return unit;
  }
  AnalysisContextImpl_ScanResult internalScan(Source source, AnalysisErrorListener errorListener) {
    AnalysisContextImpl_ScanResult result = new AnalysisContextImpl_ScanResult();
    Source_ContentReceiver receiver = new Source_ContentReceiver_7(source, errorListener, result);
    try {
      source.getContents(receiver);
    } catch (exception) {
      throw new AnalysisException.con3(exception);
    }
    return result;
  }
  /**
   * In response to a change to at least one of the compilation units in the given library,
   * invalidate any results that are dependent on the result of resolving that library.
   * @param librarySource the source of the library being invalidated
   * @param libraryEntry the cache entry for the library being invalidated
   */
  void invalidateLibraryResolution(Source librarySource, DartEntryImpl libraryEntry) {
    if (libraryEntry != null) {
      for (Source unitSource in libraryEntry.getValue(DartEntry.INCLUDED_PARTS)) {
        DartEntryImpl partEntry = getDartEntry(unitSource) as DartEntryImpl;
        partEntry.invalidateAllResolutionInformation();
      }
      libraryEntry.invalidateAllResolutionInformation();
      libraryEntry.setState(DartEntry.INCLUDED_PARTS, CacheState.INVALID);
    }
  }
  /**
   * Return {@code true} if this library is, or depends on, dart:html.
   * @param library the library being tested
   * @param visitedLibraries a collection of the libraries that have been visited, used to prevent
   * infinite recursion
   * @return {@code true} if this library is, or depends on, dart:html
   */
  bool isClient(LibraryElement library, Source htmlSource, Set<LibraryElement> visitedLibraries) {
    if (visitedLibraries.contains(library)) {
      return false;
    }
    if (library.source == htmlSource) {
      return true;
    }
    javaSetAdd(visitedLibraries, library);
    for (LibraryElement imported in library.importedLibraries) {
      if (isClient(imported, htmlSource, visitedLibraries)) {
        return true;
      }
    }
    for (LibraryElement exported in library.exportedLibraries) {
      if (isClient(exported, htmlSource, visitedLibraries)) {
        return true;
      }
    }
    return false;
  }
  /**
   * Perform a single analysis task.
   * <p>
   * <b>Note:</b> This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @return {@code true} if work was done, implying that there might be more work to be done
   */
  bool performSingleAnalysisTask() {
    for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(_sourceMap)) {
      SourceEntry sourceEntry = entry.getValue();
      if (sourceEntry is DartEntry) {
        DartEntry dartEntry = sourceEntry as DartEntry;
        CacheState parsedUnitState = dartEntry.getState(DartEntry.PARSED_UNIT);
        if (identical(parsedUnitState, CacheState.INVALID)) {
          try {
            parseCompilationUnit(entry.getKey());
          } on AnalysisException catch (exception) {
            ((dartEntry as DartEntryImpl)).setState(DartEntry.PARSED_UNIT, CacheState.ERROR);
            AnalysisEngine.instance.logger.logError2("Could not parse ${entry.getKey().fullName}", exception);
          }
          return true;
        }
      } else if (sourceEntry is HtmlEntry) {
        HtmlEntry htmlEntry = sourceEntry as HtmlEntry;
        CacheState parsedUnitState = htmlEntry.getState(HtmlEntry.PARSED_UNIT);
        if (identical(parsedUnitState, CacheState.INVALID)) {
          try {
            parseHtmlUnit(entry.getKey());
          } on AnalysisException catch (exception) {
            ((htmlEntry as HtmlEntryImpl)).setState(HtmlEntry.PARSED_UNIT, CacheState.ERROR);
            AnalysisEngine.instance.logger.logError2("Could not parse ${entry.getKey().fullName}", exception);
          }
          return true;
        }
      }
    }
    for (MapEntry<Source, SourceEntry> entry in getMapEntrySet(_sourceMap)) {
      SourceEntry sourceEntry = entry.getValue();
      if (sourceEntry is DartEntry && identical(sourceEntry.kind, SourceKind.LIBRARY)) {
        DartEntry dartEntry = sourceEntry as DartEntry;
        CacheState elementState = dartEntry.getState(DartEntry.ELEMENT);
        if (identical(elementState, CacheState.INVALID)) {
          try {
            computeLibraryElement(entry.getKey());
          } on AnalysisException catch (exception) {
            ((dartEntry as DartEntryImpl)).setState(DartEntry.ELEMENT, CacheState.ERROR);
            AnalysisEngine.instance.logger.logError2("Could not resolve ${entry.getKey().fullName}", exception);
          }
          return true;
        }
      } else if (sourceEntry is HtmlEntry) {
        HtmlEntry htmlEntry = sourceEntry as HtmlEntry;
        CacheState resolvedUnitState = htmlEntry.getState(HtmlEntry.RESOLVED_UNIT);
        if (identical(resolvedUnitState, CacheState.INVALID)) {
          try {
            resolveHtmlUnit(entry.getKey());
          } on AnalysisException catch (exception) {
            ((htmlEntry as HtmlEntryImpl)).setState(HtmlEntry.RESOLVED_UNIT, CacheState.ERROR);
            AnalysisEngine.instance.logger.logError2("Could not resolve ${entry.getKey().fullName}", exception);
          }
          return true;
        }
      }
    }
    return false;
  }
  HtmlScanResult scanHtml(Source source) {
    HtmlScanner scanner = new HtmlScanner(source);
    try {
      source.getContents(scanner);
    } catch (exception) {
      throw new AnalysisException.con3(exception);
    }
    return scanner.result;
  }
  /**
   * Create an entry for the newly added source. Return {@code true} if the new source is a Dart
   * file.
   * <p>
   * <b>Note:</b> This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @param source the source that has been added
   * @return {@code true} if the new source is a Dart file
   */
  bool sourceAvailable(Source source) {
    SourceEntry sourceEntry = _sourceMap[source];
    if (sourceEntry == null) {
      sourceEntry = createSourceEntry(source);
    }
    return sourceEntry is DartEntry;
  }
  /**
   * <b>Note:</b> This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @param source the source that has been changed
   */
  void sourceChanged(Source source) {
    SourceEntry sourceEntry = _sourceMap[source];
    if (sourceEntry is HtmlEntry) {
      HtmlEntryImpl htmlEntry = sourceEntry as HtmlEntryImpl;
      htmlEntry.setState(HtmlEntry.ELEMENT, CacheState.INVALID);
      htmlEntry.setState(SourceEntry.LINE_INFO, CacheState.INVALID);
      htmlEntry.setState(HtmlEntry.PARSED_UNIT, CacheState.INVALID);
      htmlEntry.setState(HtmlEntry.REFERENCED_LIBRARIES, CacheState.INVALID);
      htmlEntry.setState(HtmlEntry.RESOLVED_UNIT, CacheState.INVALID);
    } else if (sourceEntry is DartEntry) {
      DartEntryImpl dartEntry = sourceEntry as DartEntryImpl;
      List<Source> containingLibraries = getLibrariesContaining(source);
      invalidateLibraryResolution(source, dartEntry);
      dartEntry.setState(DartEntry.INCLUDED_PARTS, CacheState.INVALID);
      dartEntry.setState(SourceEntry.LINE_INFO, CacheState.INVALID);
      dartEntry.setState(DartEntry.PARSE_ERRORS, CacheState.INVALID);
      dartEntry.setState(DartEntry.PARSED_UNIT, CacheState.INVALID);
      dartEntry.setState(DartEntry.SOURCE_KIND, CacheState.INVALID);
      for (Source librarySource in containingLibraries) {
        DartEntryImpl libraryEntry = getDartEntry(librarySource) as DartEntryImpl;
        invalidateLibraryResolution(librarySource, libraryEntry);
      }
    }
  }
  /**
   * <b>Note:</b> This method must only be invoked while we are synchronized on {@link #cacheLock}.
   * @param source the source that has been deleted
   */
  void sourceRemoved(Source source) {
    DartEntry dartEntry = getDartEntry(source);
    if (dartEntry != null) {
      for (Source librarySource in getLibrariesContaining(source)) {
        DartEntryImpl libraryEntry = getDartEntry(librarySource) as DartEntryImpl;
        invalidateLibraryResolution(librarySource, libraryEntry);
      }
    }
    _sourceMap.remove(source);
  }
}
/**
 * Instances of the class {@code ScanResult} represent the results of scanning a source.
 */
class AnalysisContextImpl_ScanResult {
  /**
   * The time at which the contents of the source were last set.
   */
  int _modificationTime = 0;
  /**
   * The first token in the token stream.
   */
  Token _token;
  /**
   * The line start information that was produced.
   */
  List<int> _lineStarts;
  /**
   * Initialize a newly created result object to be empty.
   */
  AnalysisContextImpl_ScanResult() : super() {
  }
}
class Source_ContentReceiver_5 implements Source_ContentReceiver {
  List<CharSequence> contentHolder;
  Source_ContentReceiver_5(this.contentHolder);
  void accept(CharBuffer contents, int modificationTime) {
    contentHolder[0] = contents;
  }
  void accept2(String contents, int modificationTime) {
    contentHolder[0] = new CharSequence(contents);
  }
}
class RecursiveXmlVisitor_6 extends RecursiveXmlVisitor<Object> {
  final AnalysisContextImpl AnalysisContextImpl_this;
  Source htmlSource;
  List<Source> libraries;
  RecursiveXmlVisitor_6(this.AnalysisContextImpl_this, this.htmlSource, this.libraries) : super();
  Object visitXmlTagNode(XmlTagNode node) {
    if (javaStringEqualsIgnoreCase(node.tag.lexeme, AnalysisContextImpl._TAG_SCRIPT)) {
      for (XmlAttributeNode attribute in node.attributes) {
        if (javaStringEqualsIgnoreCase(attribute.name.lexeme, AnalysisContextImpl._ATTRIBUTE_SRC)) {
          try {
            Uri uri = new Uri.fromComponents(path: attribute.text);
            String fileName = uri.path;
            if (AnalysisEngine.isDartFileName(fileName)) {
              Source librarySource = AnalysisContextImpl_this._sourceFactory.resolveUri(htmlSource, fileName);
              if (librarySource.exists()) {
                libraries.add(librarySource);
              }
            }
          } catch (exception) {
            AnalysisEngine.instance.logger.logError2("Invalid URL ('${attribute.text}') in script tag in '${htmlSource.fullName}'", exception);
          }
        }
      }
    }
    return super.visitXmlTagNode(node);
  }
}
class Source_ContentReceiver_7 implements Source_ContentReceiver {
  Source source;
  AnalysisErrorListener errorListener;
  AnalysisContextImpl_ScanResult result;
  Source_ContentReceiver_7(this.source, this.errorListener, this.result);
  void accept(CharBuffer contents, int modificationTime2) {
    CharBufferScanner scanner = new CharBufferScanner(source, contents, errorListener);
    result._modificationTime = modificationTime2;
    result._token = scanner.tokenize();
    result._lineStarts = scanner.lineStarts;
  }
  void accept2(String contents, int modificationTime2) {
    StringScanner scanner = new StringScanner(source, contents, errorListener);
    result._modificationTime = modificationTime2;
    result._token = scanner.tokenize();
    result._lineStarts = scanner.lineStarts;
  }
}
/**
 * Instances of the class {@code AnalysisErrorInfoImpl} represent the analysis errors and line info
 * associated with a source.
 */
class AnalysisErrorInfoImpl implements AnalysisErrorInfo {
  /**
   * The analysis errors associated with a source, or {@code null} if there are no errors.
   */
  List<AnalysisError> _errors;
  /**
   * The line information associated with the errors, or {@code null} if there are no errors.
   */
  LineInfo _lineInfo;
  /**
   * Initialize an newly created error info with the errors and line information
   * @param errors the errors as a result of analysis
   * @param lineinfo the line info for the errors
   */
  AnalysisErrorInfoImpl(List<AnalysisError> errors, LineInfo lineInfo) {
    this._errors = errors;
    this._lineInfo = lineInfo;
  }
  /**
   * Return the errors of analysis, or {@code null} if there were no errors.
   * @return the errors as a result of the analysis
   */
  List<AnalysisError> get errors => _errors;
  /**
   * Return the line information associated with the errors, or {@code null} if there were no
   * errors.
   * @return the line information associated with the errors
   */
  LineInfo get lineInfo => _lineInfo;
}
/**
 * The enumeration {@code CacheState} defines the possible states of cached data.
 */
class CacheState implements Comparable<CacheState> {
  /**
   * The data is not in the cache and the last time an attempt was made to compute the data an
   * exception occurred, making it pointless to attempt.
   * <p>
   * Valid Transitions:
   * <ul>
   * <li>{@link #INVALID} if a source was modified that might cause the data to be computable</li>
   * </ul>
   */
  static final CacheState ERROR = new CacheState('ERROR', 0);
  /**
   * The data is not in the cache because it was flushed from the cache in order to control memory
   * usage. If the data is recomputed, results do not need to be reported.
   * <p>
   * Valid Transitions:
   * <ul>
   * <li>{@link #IN_PROCESS} if the data is being recomputed</li>
   * <li>{@link #INVALID} if a source was modified that causes the data to need to be recomputed</li>
   * </ul>
   */