Fasta source builders.

pkg/fasta/lib/src/source/source_class_builder.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library fasta.source_class_builder;
+
+import 'package:kernel/ast.dart' show
+    Class,
+    Constructor,
+    Supertype,
+    setParents;
+
+import '../errors.dart' show
+    internalError,
+    inputError;
+
+import '../kernel/kernel_builder.dart' show
+    Builder,
+    ConstructorReferenceBuilder,
+    KernelClassBuilder,
+    KernelFieldBuilder,
+    KernelFunctionBuilder,
+    KernelLibraryBuilder,
+    KernelProcedureBuilder,
+    KernelTypeBuilder,
+    KernelTypeVariableBuilder,
+    LibraryBuilder,
+    MemberBuilder,
+    MetadataBuilder,
+    ProcedureBuilder,
+    TypeVariableBuilder;
+
+import '../dill/dill_member_builder.dart' show
+    DillMemberBuilder;
+
+class SourceClassBuilder extends KernelClassBuilder {
+  final Class cls;
+
+  final Map<String, Builder> constructors = <String, Builder>{};
+
+  final Map<String, Builder> membersInScope;
+
+  final List<ConstructorReferenceBuilder> constructorReferences;
+
+  SourceClassBuilder(List<MetadataBuilder> metadata, int modifiers,
+      String name, List<TypeVariableBuilder> typeVariables,
+      KernelTypeBuilder supertype, List<KernelTypeBuilder>interfaces,
+      Map<String, Builder> members, List<KernelTypeBuilder> types,
+      LibraryBuilder parent, this.constructorReferences, [Class cls])
+      : cls = cls ?? new Class(name: name),
+        membersInScope = computeMembersInScope(members, name),
+        super(metadata, modifiers, name, typeVariables, supertype, interfaces,
+            members, types, parent);
+
+  int resolveTypes(LibraryBuilder library) {
+    int count = 0;
+    if (typeVariables != null) {
+      for (KernelTypeVariableBuilder t in typeVariables) {
+        cls.typeParameters.add(t.parameter);
+      }
+      setParents(cls.typeParameters, cls);
+      count += cls.typeParameters.length;
+    }
+    return count + super.resolveTypes(library);
+  }
+
+  Class build(KernelLibraryBuilder library) {
+    void buildBuilder(Builder builder) {
+      if (builder is KernelFieldBuilder) {
+        // TODO(ahe): It would be nice to have a common interface for the build
+        // method to avoid duplicating these two cases.
+        cls.addMember(builder.build(library.library));
+      } else if (builder is KernelFunctionBuilder) {
+        cls.addMember(builder.build(library.library));
+      } else {
+        internalError("Unhandled builder: ${builder.runtimeType}");
+      }
+    }
+    members.forEach((String name, Builder builder) {
+      do {
+        buildBuilder(builder);
+        builder = builder.next;
+      } while (builder != null);
+    });
+    cls.supertype = supertype?.buildSupertype();
+    // TODO(ahe): If `cls.supertype` is null, and this isn't Object, report a
+    // compile-time error.
+    cls.isAbstract = isAbstract;
+    if (interfaces != null) {
+      for (KernelTypeBuilder interface in interfaces) {
+        Supertype supertype = interface.buildSupertype();
+        if (supertype != null) {
+          // TODO(ahe): Report an error if supertype is null.
+          cls.implementedTypes.add(supertype);
+        }
+      }
+    }
+    return cls;
+  }
+
+  int convertConstructors(KernelLibraryBuilder library) {
+    List<String> oldConstructorNames = <String>[];
+    members.forEach((String name, MemberBuilder builder) {
+      if (isConstructorName(name, this.name)) {
+        oldConstructorNames.add(name);
+        String newName = "";
+        int index = name.indexOf(".");
+        if (index != -1) {
+          newName = name.substring(index + 1);
+        }
+        if (builder is KernelProcedureBuilder) {
+          Builder constructor = builder.toConstructor(newName, typeVariables);
+          Builder other = members[newName];
+          if (other != null) {
+            return inputError(null, null, "Constructor name '$newName' "
+                "conflicts with other declaration.");
+          }
+          constructors[newName] = constructor;
+        } else {
+          return inputError(null, null, "Expected a constructor or factory.");
+        }
+      }
+    });
+    for (String name in oldConstructorNames) {
+      members.remove(name);
+    }
+    constructors.forEach((String name, Builder builder) {
+      members[name] = builder;
+    });
+    return oldConstructorNames.length;
+  }
+
+  Builder findConstructorOrFactory(String name) => constructors[name];
+
+  void addSyntheticConstructor(Constructor constructor) {
+    String name = constructor.name.name;
+    cls.constructors.add(constructor);
+    constructor.parent = cls;
+    DillMemberBuilder memberBuilder = new DillMemberBuilder(constructor, this);
+    memberBuilder.next = constructors[name];
+    constructors[name] = memberBuilder;
+  }
+}
+
+bool isConstructorName(String name, String className) {
+  if (name.startsWith(className)) {
+    if (name.length == className.length) return true;
+    if (name.startsWith(".", className.length)) return true;
+  }
+  return false;
+}
+
+Map<String, Builder> computeMembersInScope(Map<String, Builder> members,
+    String className) {
+  Map<String, Builder> membersInScope = <String, Builder>{};
+  members.forEach((String name, Builder builder) {
+    if (builder is ProcedureBuilder) {
+      if (isConstructorName(builder.name, className)) return;
+    }
+    if (name.indexOf(".") != -1) {
+      inputError(null, null, "Only constructors and factories can have names "
+          "containing a period ('.'): $name");
+    }
+    membersInScope[name] = builder;
+  });
+  return membersInScope;
+}