dartfmt pkg/compiler

pkg/compiler/lib/src/dart_backend/renamer.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart_backend;
 
-Comparator get _compareNodes =>
-    compareBy((n) => n.getBeginToken().charOffset);
+Comparator get _compareNodes => compareBy((n) => n.getBeginToken().charOffset);
 
 abstract class Renamable implements Comparable {
   final int RENAMABLE_TYPE_ELEMENT = 1;
   final int RENAMABLE_TYPE_MEMBER = 2;
   final int RENAMABLE_TYPE_LOCAL = 3;
 
   final Set<Node> nodes;
 
   Renamable(this.nodes);
   int compareTo(Renamable other) {
     int nodesDiff = other.nodes.length.compareTo(this.nodes.length);
     if (nodesDiff != 0) return nodesDiff;
     int typeDiff = this.kind.compareTo(other.kind);
     return typeDiff != 0 ? typeDiff : compareInternals(other);
   }
 
   int compareInternals(Renamable other);
   int get kind;
 
   String createNewName(PlaceholderRenamer placeholderRenamer);
 }
 
 class GlobalRenamable extends Renamable {
   final Entity entity;
 
-  GlobalRenamable(this.entity, Set<Node> nodes)
-      : super(nodes);
+  GlobalRenamable(this.entity, Set<Node> nodes) : super(nodes);
 
   int compareInternals(GlobalRenamable other) =>
       compareElements(this.entity, other.entity);
   int get kind => RENAMABLE_TYPE_ELEMENT;
   String createNewName(PlaceholderRenamer placeholderRenamer) {
     return placeholderRenamer._renameGlobal(entity);
   }
 }
 
 class MemberRenamable extends Renamable {
   final String identifier;
-  MemberRenamable(this.identifier, Set<Node> nodes)
-      : super(nodes);
+  MemberRenamable(this.identifier, Set<Node> nodes) : super(nodes);
   int compareInternals(MemberRenamable other) =>
       this.identifier.compareTo(other.identifier);
   int get kind => RENAMABLE_TYPE_MEMBER;
   String createNewName(PlaceholderRenamer placeholderRenamer) {
     return placeholderRenamer._generateMemberName(identifier);
   }
 }
 
 class LocalRenamable extends Renamable {
-  LocalRenamable(Set<Node> nodes)
-      : super(nodes);
-  int compareInternals(LocalRenamable other) =>
-      _compareNodes(sorted(this.nodes, _compareNodes)[0],
-          sorted(other.nodes, _compareNodes)[0]);
+  LocalRenamable(Set<Node> nodes) : super(nodes);
+  int compareInternals(LocalRenamable other) => _compareNodes(
+      sorted(this.nodes, _compareNodes)[0],
+      sorted(other.nodes, _compareNodes)[0]);
   int get kind => RENAMABLE_TYPE_LOCAL;
   String createNewName(PlaceholderRenamer placeholderRenamer) {
     return placeholderRenamer._generateUniqueTopLevelName("");
   }
 }
 
 /**
  * Renames only top-level elements that would lead to ambiguity if not renamed.
  */
 class PlaceholderRenamer {
   /// After running [computeRenames] this will contain the computed renames.
   final Map<Node, String> renames = new Map<Node, String>();
+
   /// After running [computeRenames] this will map the used platform
   /// libraries to their respective prefixes.
   final Map<LibraryElement, String> platformImports =
       <LibraryElement, String>{};
 
   final bool enableMinification;
   final Set<String> fixedDynamicNames;
   final Set<String> fixedStaticNames;
   final Map<Element, LibraryElement> reexportingLibraries;
   final bool cutDeclarationTypes;
 
   final Map<Entity, String> _renamedCache = new Map<Entity, String>();
   final Map<Entity, Map<String, String>> _privateCache =
       new Map<Entity, Map<String, String>>();
 
   // Identifiers that has already been used, or are reserved by the
   // language/platform.
   Set<String> _forbiddenIdentifiers;
   Set<String> _allNamedParameterIdentifiers;
 
   Generator _generator;
 
-  PlaceholderRenamer(this.fixedDynamicNames,
-                     this.fixedStaticNames,
-                     this.reexportingLibraries,
-                     {this.enableMinification, this.cutDeclarationTypes});
+  PlaceholderRenamer(
+      this.fixedDynamicNames, this.fixedStaticNames, this.reexportingLibraries,
+      {this.enableMinification, this.cutDeclarationTypes});
 
   void _renameNodes(Iterable<Node> nodes, String renamer(Node node)) {
     for (Node node in sorted(nodes, _compareNodes)) {
       renames[node] = renamer(node);
     }
   }
 
   String _generateUniqueTopLevelName(String originalName) {
     String newName = _generator.generate(originalName, (name) {
       return _forbiddenIdentifiers.contains(name) ||
-             _allNamedParameterIdentifiers.contains(name);
+          _allNamedParameterIdentifiers.contains(name);
     });
     _forbiddenIdentifiers.add(newName);
     return newName;
   }
 
   String _generateMemberName(String original) {
     return _generator.generate(original, _forbiddenIdentifiers.contains);
   }
 
   /// Looks up [originalName] in the [_privateCache] cache of [library].
   /// If [originalName] was not renamed before, generate a new name.
   String _getPrivateName(LibraryElement library, String originalName) {
-    return _privateCache.putIfAbsent(library, () => new Map<String, String>())
-        .putIfAbsent(originalName,
-                     () => _generateUniqueTopLevelName(originalName));
+    return _privateCache
+        .putIfAbsent(library, () => new Map<String, String>())
+        .putIfAbsent(
+            originalName, () => _generateUniqueTopLevelName(originalName));
   }
 
   String _renameConstructor(ConstructorPlaceholder placeholder) {
     String name = placeholder.element.name;
     if (name == '') return "";
     String result = _renameGlobal(placeholder.element);
     return result;
   }
 
   String _renameGlobal(Entity entity) {
     assert(entity is! Element ||
-           Elements.isMalformed(entity) ||
-           Elements.isStaticOrTopLevel(entity) ||
-           entity is TypeVariableElement);
+        Elements.isMalformed(entity) ||
+        Elements.isStaticOrTopLevel(entity) ||
+        entity is TypeVariableElement);
     // TODO(smok): We may want to reuse class static field and method names.
     if (entity is Element) {
       LibraryElement library = entity.library;
       if (reexportingLibraries.containsKey(entity)) {
         library = reexportingLibraries[entity];
       }
       if (library.isPlatformLibrary) {
         // TODO(johnniwinther): Handle prefixes for dart:core.
         if (library.canonicalUri == Uris.dart_core) return entity.name;
         if (library.isInternalLibrary) {
-          throw new SpannableAssertionFailure(entity,
+          throw new SpannableAssertionFailure(
+              entity,
               "Internal library $library should never have been imported from "
               "the code compiled by dart2dart.");
         }
 
         String prefix = platformImports.putIfAbsent(library, () => null);
-        if (entity.isTopLevel &&
-            fixedDynamicNames.contains(entity.name)) {
+        if (entity.isTopLevel && fixedDynamicNames.contains(entity.name)) {
           if (prefix == null) {
             prefix = _generateUniqueTopLevelName('');
             platformImports[library] = prefix;
           }
           return '$prefix.${entity.name}';
         }
         return entity.name;
       }
     }
-    String name = _renamedCache.putIfAbsent(entity,
-            () => _generateUniqueTopLevelName(entity.name));
+    String name = _renamedCache.putIfAbsent(
+        entity, () => _generateUniqueTopLevelName(entity.name));
     // Look up in [_renamedCache] for a name for [entity] .
     // If it was not renamed before, generate a new name.
     return name;
   }
 
   void _computeMinifiedRenames(PlaceholderCollector placeholderCollector) {
     _generator = new MinifyingGenerator();
 
     // Build a list sorted by usage of local nodes that will be renamed to
     // the same identifier. So the top-used local variables in all functions
     // will be renamed first and will all share the same new identifier.
-    int maxLength = placeholderCollector.functionScopes.values.fold(0,
-        (a, b) => max(a, b.localPlaceholders.length));
+    int maxLength = placeholderCollector.functionScopes.values
+        .fold(0, (a, b) => max(a, b.localPlaceholders.length));
 
-    List<Set<Node>> allLocals = new List<Set<Node>>
-        .generate(maxLength, (_) => new Set<Node>());
+    List<Set<Node>> allLocals =
+        new List<Set<Node>>.generate(maxLength, (_) => new Set<Node>());
 
     for (FunctionScope functionScope
         in placeholderCollector.functionScopes.values) {
       // Add current sorted local identifiers to the whole sorted list
       // of all local identifiers for all functions.
-      List<LocalPlaceholder> currentSortedPlaceholders =
-          sorted(functionScope.localPlaceholders,
-              compareBy((LocalPlaceholder ph) => -ph.nodes.length));
+      List<LocalPlaceholder> currentSortedPlaceholders = sorted(
+          functionScope.localPlaceholders,
+          compareBy((LocalPlaceholder ph) => -ph.nodes.length));
 
       List<Set<Node>> currentSortedNodes = currentSortedPlaceholders
-          .map((LocalPlaceholder ph) => ph.nodes).toList();
+          .map((LocalPlaceholder ph) => ph.nodes)
+          .toList();
 
       for (int i = 0; i < currentSortedNodes.length; i++) {
         allLocals[i].addAll(currentSortedNodes[i]);
       }
     }
 
     // Rename elements, members and locals together based on their usage
     // count, otherwise when we rename elements first there will be no good
     // identifiers left for members even if they are used often.
     List<Renamable> renamables = new List<Renamable>();
-    placeholderCollector.elementNodes.forEach(
-        (Element element, Set<Node> nodes) {
+    placeholderCollector.elementNodes
+        .forEach((Element element, Set<Node> nodes) {
       renamables.add(new GlobalRenamable(element, nodes));
     });
-    placeholderCollector.memberPlaceholders.forEach(
-        (String memberName, Set<Identifier> identifiers) {
+    placeholderCollector.memberPlaceholders
+        .forEach((String memberName, Set<Identifier> identifiers) {
       renamables.add(new MemberRenamable(memberName, identifiers));
     });
     for (Set<Node> localIdentifiers in allLocals) {
       renamables.add(new LocalRenamable(localIdentifiers));
     }
     renamables.sort();
     for (Renamable renamable in renamables) {
       String newName = renamable.createNewName(this);
       _renameNodes(renamable.nodes, (_) => newName);
     }
   }
 
   void _computeNonMinifiedRenames(PlaceholderCollector placeholderCollector) {
     _generator = new ConservativeGenerator();
     // Rename elements.
-    placeholderCollector.elementNodes.forEach(
-        (Element element, Set<Node> nodes) {
+    placeholderCollector.elementNodes
+        .forEach((Element element, Set<Node> nodes) {
       _renameNodes(nodes, (_) => _renameGlobal(element));
     });
 
     // Rename locals.
-    placeholderCollector.functionScopes.forEach(
-        (functionElement, functionScope) {
-
+    placeholderCollector.functionScopes
+        .forEach((functionElement, functionScope) {
       Set<String> memberIdentifiers = new Set<String>();
       Set<LocalPlaceholder> placeholders = functionScope.localPlaceholders;
       if (functionElement != null && functionElement.enclosingClass != null) {
-        functionElement.enclosingClass.forEachMember(
-            (enclosingClass, member) {
-              memberIdentifiers.add(member.name);
-            });
+        functionElement.enclosingClass.forEachMember((enclosingClass, member) {
+          memberIdentifiers.add(member.name);
+        });
       }
       Set<String> usedLocalIdentifiers = new Set<String>();
       for (LocalPlaceholder placeholder in placeholders) {
         String nextId = _generator.generate(placeholder.identifier, (name) {
-          return functionScope.parameterIdentifiers.contains(name)
-              || _forbiddenIdentifiers.contains(name)
-              || usedLocalIdentifiers.contains(name)
-              || memberIdentifiers.contains(name);
+          return functionScope.parameterIdentifiers.contains(name) ||
+              _forbiddenIdentifiers.contains(name) ||
+              usedLocalIdentifiers.contains(name) ||
+              memberIdentifiers.contains(name);
         });
         usedLocalIdentifiers.add(nextId);
         _renameNodes(placeholder.nodes, (_) => nextId);
       }
     });
 
     // Do not rename members to top-levels, that allows to avoid renaming
     // members to constructors.
     placeholderCollector.memberPlaceholders.forEach((identifier, nodes) {
       String newIdentifier = _generateMemberName(identifier);
       _renameNodes(nodes, (_) => newIdentifier);
     });
   }
 
   /// Finds renamings for all the placeholders in [placeholderCollector] and
   /// stores them in [renames].
   /// Also adds to [platformImports] all the platform-libraries that are used.
   void computeRenames(PlaceholderCollector placeholderCollector) {
     _allNamedParameterIdentifiers = new Set<String>();
-    for (FunctionScope functionScope in
-        placeholderCollector.functionScopes.values) {
+    for (FunctionScope functionScope
+        in placeholderCollector.functionScopes.values) {
       _allNamedParameterIdentifiers.addAll(functionScope.parameterIdentifiers);
     }
 
     _forbiddenIdentifiers = new Set<String>.from(fixedDynamicNames);
     _forbiddenIdentifiers.addAll(fixedStaticNames);
     _forbiddenIdentifiers.addAll(Keyword.keywords.keys);
     _forbiddenIdentifiers.add('main');
 
     if (enableMinification) {
       _computeMinifiedRenames(placeholderCollector);
     } else {
       _computeNonMinifiedRenames(placeholderCollector);
     }
 
     // Rename constructors.
-    for (ConstructorPlaceholder placeholder in
-        placeholderCollector.constructorPlaceholders) {
-      renames[placeholder.node] =
-          _renameConstructor(placeholder);
-    };
+    for (ConstructorPlaceholder placeholder
+        in placeholderCollector.constructorPlaceholders) {
+      renames[placeholder.node] = _renameConstructor(placeholder);
+    }
+    ;
 
     // Rename private identifiers uniquely for each library.
-    placeholderCollector.privateNodes.forEach(
-        (LibraryElement library, Set<Identifier> identifiers) {
+    placeholderCollector.privateNodes
+        .forEach((LibraryElement library, Set<Identifier> identifiers) {
       for (Identifier identifier in identifiers) {
         renames[identifier] = _getPrivateName(library, identifier.source);
       }
     });
 
     // Rename unresolved nodes, to make sure they still do not resolve.
     for (Node node in placeholderCollector.unresolvedNodes) {
       renames[node] = _generateUniqueTopLevelName('Unresolved');
     }
 
     // Erase prefixes that are now not needed.
     for (Node node in placeholderCollector.prefixNodesToErase) {
       renames[node] = '';
     }
 
     if (cutDeclarationTypes) {
-      for (DeclarationTypePlaceholder placeholder in
-           placeholderCollector.declarationTypePlaceholders) {
+      for (DeclarationTypePlaceholder placeholder
+          in placeholderCollector.declarationTypePlaceholders) {
         renames[placeholder.typeNode] = placeholder.requiresVar ? 'var' : '';
       }
     }
   }
 }
 
 /**
  * Generates mini ID based on index.
  * In other words, it converts index to visual representation
  * as if digits are given characters.
  */
 String generateMiniId(int index) {
   const String firstCharAlphabet =
       r'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
   const String otherCharsAlphabet =
       r'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_$';
   // It's like converting index in decimal to [chars] radix.
   if (index < firstCharAlphabet.length) return firstCharAlphabet[index];
   StringBuffer resultBuilder = new StringBuffer();
   resultBuilder.writeCharCode(
-     firstCharAlphabet.codeUnitAt(index % firstCharAlphabet.length));
+      firstCharAlphabet.codeUnitAt(index % firstCharAlphabet.length));
   index ~/= firstCharAlphabet.length;
   int length = otherCharsAlphabet.length;
   while (index >= length) {
     resultBuilder.writeCharCode(otherCharsAlphabet.codeUnitAt(index % length));
     index ~/= length;
   }
   resultBuilder.write(otherCharsAlphabet[index]);
   return resultBuilder.toString();
 }
 
 abstract class Generator {
   String generate(String originalName, bool isForbidden(String name));
 }
 
 /// Always tries to return original identifier name unless it is forbidden.
 class ConservativeGenerator implements Generator {
   String generate(String originalName, bool isForbidden(String name)) {
     String result = originalName;
     int index = 0;
-    while (isForbidden(result) ){ //|| result == originalName) {
+    while (isForbidden(result)) {
+      //|| result == originalName) {
       result = '${originalName}_${generateMiniId(index++)}';
     }
     return result;
   }
 }
 
 /// Always tries to generate the most compact identifier.
 class MinifyingGenerator implements Generator {
   int index = 0;
 
   MinifyingGenerator();
 
   String generate(String originalName, bool isForbidden(String name)) {
     String result;
     do {
       result = generateMiniId(index++);
     } while (isForbidden(result));
     return result;
   }
-}
+}