pkg/front_end/lib/src/dill/dill_extension_builder.dart

// Copyright (c) 2019, 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.

import 'package:kernel/ast.dart';

import '../base/lookup_result.dart';
import '../base/name_space.dart';
import '../base/scope.dart';
import '../builder/declaration_builders.dart';
import '../builder/member_builder.dart';
import '../builder/type_builder.dart';
import 'dill_builder_mixins.dart';
import 'dill_class_builder.dart';
import 'dill_extension_member_builder.dart';
import 'dill_library_builder.dart';

class DillExtensionBuilder extends ExtensionBuilderImpl
    with DillDeclarationBuilderMixin {
  @override
  final DillLibraryBuilder libraryBuilder;

  @override
  final Extension extension;

  late final DeclarationNameSpace _nameSpace;

  final List<MemberBuilder> _constructorBuilders = [];
  final List<MemberBuilder> _memberBuilders = [];

  List<NominalParameterBuilder>? _typeParameters;
  TypeBuilder? _onType;

  DillExtensionBuilder(this.extension, this.libraryBuilder) {
    Map<String, MemberLookupResult> content = {};

    bool isPrivateFromOtherLibrary(Member member) {
      Name name = member.name;
      return name.isPrivate &&
          name.libraryReference != extension.enclosingLibrary.reference;
    }

    for (ExtensionMemberDescriptor descriptor in extension.memberDescriptors) {
      if (descriptor.isInternalImplementation) continue;

      String name = descriptor.name.text;
      switch (descriptor.kind) {
        case ExtensionMemberKind.Method:
          Procedure procedure = descriptor.memberReference!.asProcedure;
          MemberBuilder builder;
          if (descriptor.isStatic) {
            builder = new DillExtensionStaticMethodBuilder(
                procedure, descriptor, libraryBuilder, this);
          } else {
            Procedure? tearOff = descriptor.tearOffReference?.asProcedure;
            assert(tearOff != null, "No tear found for ${descriptor}");
            builder = new DillExtensionInstanceMethodBuilder(
                procedure, descriptor, libraryBuilder, this, tearOff!);
          }
          if (!isPrivateFromOtherLibrary(procedure)) {
            assert(
                !content.containsKey(name),
                "Unexpected existing member ${content[name]}, "
                "trying to add $builder.");
            content[name] = builder;
          }
          _memberBuilders.add(builder);
          break;
        case ExtensionMemberKind.Getter:
          Procedure procedure = descriptor.memberReference!.asProcedure;
          DillExtensionGetterBuilder builder = new DillExtensionGetterBuilder(
              procedure, descriptor, libraryBuilder, this);
          if (!isPrivateFromOtherLibrary(procedure)) {
            MemberLookupResult? existing = content[name];
            if (existing != null) {
              // Coverage-ignore-block(suite): Not run.
              assert(
                  existing.getable == null && existing.setable != null,
                  "Unexpected existing member $existing, "
                  "trying to add $builder.");
              assert(
                  existing.isStatic == builder.isStatic,
                  "Static/instance conflict between existing member $existing "
                  "and new builder $builder.");
              content[name] = new GetableSetableMemberResult(
                  builder, existing.setable!,
                  isStatic: existing.isStatic);
            } else {
              content[name] = builder;
            }
          }
          _memberBuilders.add(builder);
          break;
        case ExtensionMemberKind.Field:
          Field field = descriptor.memberReference!.asField;
          DillExtensionFieldBuilder builder = new DillExtensionFieldBuilder(
              field, descriptor, libraryBuilder, this);
          if (!isPrivateFromOtherLibrary(field)) {
            MemberLookupResult? existing = content[name];
            if (existing != null) {
              // Coverage-ignore-block(suite): Not run.
              assert(
                  existing.getable == null && existing.setable != null,
                  "Unexpected existing member $existing, "
                  "trying to add $builder.");
              assert(
                  existing.isStatic == builder.isStatic,
                  "Static/instance conflict between existing member $existing "
                  "and new builder $builder.");
              content[name] = new GetableSetableMemberResult(
                  builder, existing.setable!,
                  isStatic: existing.isStatic);
            } else {
              content[name] = builder;
            }
          }
          _memberBuilders.add(builder);
          break;
        case ExtensionMemberKind.Setter:
          Procedure procedure = descriptor.memberReference!.asProcedure;
          DillExtensionSetterBuilder builder = new DillExtensionSetterBuilder(
              procedure, descriptor, libraryBuilder, this);
          if (!isPrivateFromOtherLibrary(procedure)) {
            MemberLookupResult? existing = content[name];
            if (existing != null) {
              assert(
                  existing.getable != null && existing.setable == null,
                  "Unexpected existing member $existing, "
                  "trying to add $builder.");
              assert(
                  existing.isStatic == builder.isStatic,
                  "Static/instance conflict between existing member $existing "
                  "and new builder $builder.");
              content[name] = new GetableSetableMemberResult(
                  existing.getable!, builder,
                  isStatic: existing.isStatic);
            } else {
              content[name] = builder;
            }
          }
          _memberBuilders.add(builder);
          break;
        case ExtensionMemberKind.Operator:
          Procedure procedure = descriptor.memberReference!.asProcedure;
          DillExtensionOperatorBuilder builder =
              new DillExtensionOperatorBuilder(
                  procedure, descriptor, libraryBuilder, this);
          if (!isPrivateFromOtherLibrary(procedure)) {
            assert(
                !content.containsKey(name),
                "Unexpected existing member ${content[name]}, "
                "trying to add $builder.");
            content[name] = builder;
          }
          _memberBuilders.add(builder);
          break;
      }
    }

    _nameSpace =
        new DillDeclarationNameSpace(constructors: const {}, content: content);
  }

  @override
  DillLibraryBuilder get parent => libraryBuilder;

  @override
  Reference get reference => extension.reference;

  @override
  int get fileOffset => extension.fileOffset;

  @override
  String get name => extension.name;

  @override
  Uri get fileUri => extension.fileUri;

  @override
  DeclarationNameSpace get nameSpace => _nameSpace;

  @override
  // Coverage-ignore(suite): Not run.
  Iterator<MemberBuilder> get unfilteredMembersIterator =>
      _memberBuilders.iterator;

  @override
  // Coverage-ignore(suite): Not run.
  Iterator<T> filteredMembersIterator<T extends MemberBuilder>(
          {required bool includeDuplicates}) =>
      new FilteredIterator<T>(_memberBuilders.iterator,
          includeDuplicates: includeDuplicates);

  @override
  // Coverage-ignore(suite): Not run.
  Iterator<MemberBuilder> get unfilteredConstructorsIterator =>
      _constructorBuilders.iterator;

  @override
  // Coverage-ignore(suite): Not run.
  Iterator<T> filteredConstructorsIterator<T extends MemberBuilder>(
          {required bool includeDuplicates}) =>
      new FilteredIterator<T>(_constructorBuilders.iterator,
          includeDuplicates: includeDuplicates);

  @override
  List<NominalParameterBuilder>? get typeParameters {
    if (_typeParameters == null && extension.typeParameters.isNotEmpty) {
      _typeParameters = computeTypeParameterBuilders(
          extension.typeParameters, libraryBuilder.loader);
    }
    return _typeParameters;
  }

  @override
  // Coverage-ignore(suite): Not run.
  TypeBuilder get onType {
    return _onType ??=
        libraryBuilder.loader.computeTypeBuilder(extension.onType);
  }

  @override
  // Coverage-ignore(suite): Not run.
  List<TypeParameter> get typeParameterNodes => extension.typeParameters;
}