Class: RBS::DefinitionBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/rbs/definition_builder.rb

Defined Under Namespace

Classes: OneAncestors

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(env:) ⇒ DefinitionBuilder

Returns a new instance of DefinitionBuilder.



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# File 'lib/rbs/definition_builder.rb', line 87

def initialize(env:)
  @env = env
  @type_name_resolver = TypeNameResolver.from_env(env)

  @instance_cache = {}
  @singleton_cache = {}
  @interface_cache = {}

  @one_instance_cache = {}
  @one_singleton_cache = {}

  @instance_ancestors_cache = {}
  @singleton_ancestor_cache = {}

  @one_instance_ancestors_cache = {}
  @one_singleton_ancestors_cache = {}
end

Instance Attribute Details

#env ⇒ Object (readonly)

Returns the value of attribute env.



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# File 'lib/rbs/definition_builder.rb', line 3

def env
  @env
end

#instance_ancestors_cache ⇒ Object (readonly)

Returns the value of attribute instance_ancestors_cache.



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# File 'lib/rbs/definition_builder.rb', line 13

def instance_ancestors_cache
  @instance_ancestors_cache
end

#instance_cache ⇒ Object (readonly)

Returns the value of attribute instance_cache.



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# File 'lib/rbs/definition_builder.rb', line 6

def instance_cache
  @instance_cache
end

#interface_cache ⇒ Object (readonly)

Returns the value of attribute interface_cache.



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# File 'lib/rbs/definition_builder.rb', line 8

def interface_cache
  @interface_cache
end

#one_instance_ancestors_cache ⇒ Object (readonly)

Returns the value of attribute one_instance_ancestors_cache.



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# File 'lib/rbs/definition_builder.rb', line 16

def one_instance_ancestors_cache
  @one_instance_ancestors_cache
end

#one_instance_cache ⇒ Object (readonly)

Returns the value of attribute one_instance_cache.



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# File 'lib/rbs/definition_builder.rb', line 10

def one_instance_cache
  @one_instance_cache
end

#one_singleton_ancestors_cache ⇒ Object (readonly)

Returns the value of attribute one_singleton_ancestors_cache.



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# File 'lib/rbs/definition_builder.rb', line 17

def one_singleton_ancestors_cache
  @one_singleton_ancestors_cache
end

#one_singleton_cache ⇒ Object (readonly)

Returns the value of attribute one_singleton_cache.



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# File 'lib/rbs/definition_builder.rb', line 11

def one_singleton_cache
  @one_singleton_cache
end

#singleton_ancestor_cache ⇒ Object (readonly)

Returns the value of attribute singleton_ancestor_cache.



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# File 'lib/rbs/definition_builder.rb', line 14

def singleton_ancestor_cache
  @singleton_ancestor_cache
end

#singleton_cache ⇒ Object (readonly)

Returns the value of attribute singleton_cache.



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# File 'lib/rbs/definition_builder.rb', line 7

def singleton_cache
  @singleton_cache
end

#type_name_resolver ⇒ Object (readonly)

Returns the value of attribute type_name_resolver.



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# File 'lib/rbs/definition_builder.rb', line 4

def type_name_resolver
  @type_name_resolver
end

Instance Method Details

#build_instance(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 388

def build_instance(type_name)
  try_cache type_name, cache: instance_cache do
    entry = env.class_decls[type_name] or raise "Unknown name for build_instance: #{type_name}"

    case entry
    when Environment::ClassEntry, Environment::ModuleEntry
      ancestors = instance_ancestors(type_name)
      self_type = Types::ClassInstance.new(name: type_name,
                                           args: Types::Variable.build(entry.type_params.each.map(&:name)),
                                           location: nil)

      definition_pairs = ancestors.ancestors.map do |ancestor|
        case ancestor
        when Definition::Ancestor::Instance
          [ancestor, build_one_instance(ancestor.name)]
        when Definition::Ancestor::Singleton
          [ancestor, build_one_singleton(ancestor.name)]
        else
          raise
        end
      end

      if entry.is_a?(Environment::ModuleEntry)
        entry.self_types.each do |module_self|
          ancestor = Definition::Ancestor::Instance.new(name: module_self.name, args: module_self.args)
          definition_pairs.push(
            [
              ancestor,
              if module_self.name.interface?
                build_interface(module_self.name)
              else
                build_instance(module_self.name)
              end
            ]
          )
        end
      end

      merge_definitions(type_name, definition_pairs, entry: entry, self_type: self_type, ancestors: ancestors)

    else
      raise
    end
  end
end

#build_interface(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 1019

def build_interface(type_name)
  try_cache(type_name, cache: interface_cache) do
    entry = env.interface_decls[type_name] or raise "Unknown name for build_interface: #{type_name}"
    declaration = entry.decl

    self_type = Types::Interface.new(
      name: type_name,
      args: Types::Variable.build(declaration.type_params.each.map(&:name)),
      location: nil
    )

    Definition.new(type_name: type_name, entry: entry, self_type: self_type, ancestors: nil).tap do |definition|
      include_members = []
      def_members = []
      alias_members = []

      declaration.members.each do |member|
        case member
        when AST::Members::Include
          include_members << member
        when AST::Members::MethodDefinition
          def_members << member
        when AST::Members::Alias
          alias_members << member
        end
      end

      include_members.each do |member|
        NoMixinFoundError.check!(member.name, env: env, member: member)

        mixin = build_interface(member.name)

        args = member.args
        type_params = mixin.entry.decl.type_params

        InvalidTypeApplicationError.check!(
          type_name: type_name,
          args: args,
          params: type_params.each.map(&:name),
          location: member.location
        )

        sub = Substitution.build(type_params.each.map(&:name), args)
        mixin.methods.each do |name, method|
          definition.methods[name] = method.sub(sub)
        end
      end

      def_members.each do |member|
        DuplicatedMethodDefinitionError.check!(
          decl: declaration,
          methods: definition.methods,
          name: member.name,
          location: member.location
        )

        method = Definition::Method.new(
          super_method: nil,
          defs: member.types.map do |method_type|
            Definition::Method::TypeDef.new(
              type: method_type,
              member: member,
              defined_in: type_name,
              implemented_in: nil
            )
          end,
          accessibility: :public
        )
        definition.methods[member.name] = method
      end

      alias_members.each do |member|
        UnknownMethodAliasError.check!(
          methods: definition.methods,
          original_name: member.old_name,
          aliased_name: member.new_name,
          location: member.location
        )

        DuplicatedMethodDefinitionError.check!(
          decl: declaration,
          methods: definition.methods,
          name: member.new_name,
          location: member.location
        )

        # FIXME: may cause a problem if #old_name has super type
        definition.methods[member.new_name] = definition.methods[member.old_name]
      end
    end
  end
end

#build_one_instance(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 591

def build_one_instance(type_name)
  try_cache(type_name, cache: one_instance_cache) do
    entry = env.class_decls[type_name]

    self_type = Types::ClassInstance.new(name: type_name,
                                         args: Types::Variable.build(entry.type_params.each.map(&:name)),
                                         location: nil)
    ancestors = [Definition::Ancestor::Instance.new(name: type_name, args: self_type.args)]

    Definition.new(type_name: type_name, entry: entry, self_type: self_type, ancestors: ancestors).tap do |definition|
      method_definition_members(type_name, entry, kind: :instance).each do |method_name, array|
        visibility, method_def, *members = array

        m = if method_def
              Definition::Method.new(
                super_method: nil,
                accessibility: visibility,
                defs: method_def.defs.map {|defn| defn.update(implemented_in: type_name) }
              )
            else
              Definition::Method.new(
                super_method: nil,
                accessibility: visibility,
                defs: []
              )
            end

        definition.methods[method_name] = members.inject(m) do |original, member|
          defs = member.types.map do |method_type|
            Definition::Method::TypeDef.new(
              type: method_type,
              member: member,
              implemented_in: type_name,
              defined_in: type_name
            )
          end

          Definition::Method.new(
            super_method: nil,
            defs: defs + original.defs,
            accessibility: original.accessibility
          )
        end
      end

      entry.decls.each do |d|
        each_member_with_accessibility(d.decl.members) do |member, accessibility|
          case member
          when AST::Members::AttrReader, AST::Members::AttrAccessor, AST::Members::AttrWriter
            name = member.name
            type = member.type

            ivar_name = case member.ivar_name
                        when false
                          nil
                        else
                          member.ivar_name || :"@#{member.name}"
                        end

            if member.is_a?(AST::Members::AttrReader) || member.is_a?(AST::Members::AttrAccessor)
              definition.methods[name] = Definition::Method.new(
                super_method: nil,
                defs: [
                  Definition::Method::TypeDef.new(
                    type: MethodType.new(
                      type_params: [],
                      type: Types::Function.empty(type),
                      block: nil,
                      location: nil
                    ),
                    member: member,
                    defined_in: type_name,
                    implemented_in: type_name
                  )
                ],
                accessibility: accessibility
              )
            end

            if member.is_a?(AST::Members::AttrWriter) || member.is_a?(AST::Members::AttrAccessor)
              definition.methods[:"#{name}="] = Definition::Method.new(
                super_method: nil,
                defs: [
                  Definition::Method::TypeDef.new(
                    type: MethodType.new(
                      type_params: [],
                      type: Types::Function.empty(type).update(
                        required_positionals: [Types::Function::Param.new(name: name, type: type)]
                      ),
                      block: nil,
                      location: nil
                    ),
                    member: member,
                    defined_in: type_name,
                    implemented_in: type_name
                  ),
                ],
                accessibility: accessibility
              )
            end

            if ivar_name
              definition.instance_variables[ivar_name] = Definition::Variable.new(
                parent_variable: nil,
                type: type,
                declared_in: type_name
              )
            end

          when AST::Members::InstanceVariable
            definition.instance_variables[member.name] = Definition::Variable.new(
              parent_variable: nil,
              type: member.type,
              declared_in: type_name
            )

          when AST::Members::ClassVariable
            definition.class_variables[member.name] = Definition::Variable.new(
              parent_variable: nil,
              type: member.type,
              declared_in: type_name
            )

          end
        end
      end

      entry.decls.each do |d|
        d.decl.members.each do |member|
          case member
          when AST::Members::Alias
            if member.instance?
              UnknownMethodAliasError.check!(
                methods: definition.methods,
                original_name: member.old_name,
                aliased_name: member.new_name,
                location: member.location
              )

              DuplicatedMethodDefinitionError.check!(
                decl: d.decl,
                methods: definition.methods,
                name: member.new_name,
                location: member.location
              )

              definition.methods[member.new_name] = definition.methods[member.old_name]
            end
          end
        end
      end

      entry.decls.each do |d|
        validate_parameter_variance(
          decl: d.decl,
          methods: definition.methods
        )
      end
    end
  end
end

#build_one_singleton(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 822

def build_one_singleton(type_name)
  try_cache(type_name, cache: one_singleton_cache) do
    entry = env.class_decls[type_name]

    self_type = Types::ClassSingleton.new(name: type_name, location: nil)
    ancestors = [Definition::Ancestor::Singleton.new(name: type_name)]

    Definition.new(type_name: type_name, entry: entry, self_type: self_type, ancestors: ancestors).tap do |definition|
      method_definition_members(type_name, entry, kind: :singleton).each do |method_name, array|
        visibility, method_def, *members = array

        m = Definition::Method.new(
          super_method: nil,
          defs: method_def&.yield_self do |method_def|
            method_def.defs.map {|defn| defn.update(implemented_in: type_name) }
          end || [],
          accessibility: visibility
        )
        definition.methods[method_name] = members.inject(m) do |original, new|
          defs = new.types.map do |type|
            Definition::Method::TypeDef.new(
              type: type,
              member: new,
              defined_in: type_name,
              implemented_in: type_name
            )
          end
          Definition::Method.new(
            super_method: nil,
            defs: defs + original.defs,
            accessibility: original.accessibility
          )
        end
      end

      entry.decls.each do |d|
        d.decl.members.each do |member|
          case member
          when AST::Members::Alias
            if member.singleton?
              UnknownMethodAliasError.check!(
                methods: definition.methods,
                original_name: member.old_name,
                aliased_name: member.new_name,
                location: member.location
              )

              DuplicatedMethodDefinitionError.check!(
                decl: d.decl,
                methods: definition.methods,
                name: member.new_name,
                location: member.location
              )

              definition.methods[member.new_name] = definition.methods[member.old_name]
            end
          end
        end
      end

      unless definition.methods.key?(:new)
        instance = build_one_instance(type_name)
        initialize = instance.methods[:initialize]

        if initialize
          class_params = entry.type_params.each.map(&:name)

          initialize_defs = initialize.defs
          definition.methods[:new] = Definition::Method.new(
            super_method: nil,
            defs: initialize_defs.map do |initialize_def|
              method_type = initialize_def.type

              class_type_param_vars = Set.new(class_params)
              method_type_param_vars = Set.new(method_type.type_params)

              if class_type_param_vars.intersect?(method_type_param_vars)
                renamed_method_params = method_type.type_params.map do |name|
                  if class_type_param_vars.include?(name)
                    Types::Variable.fresh(name).name
                  else
                    name
                  end
                end
                method_params = class_params + renamed_method_params

                sub = Substitution.build(method_type.type_params, Types::Variable.build(renamed_method_params))
              else
                method_params = class_params + method_type.type_params
                sub = Substitution.build([], [])
              end

              method_type = method_type.map_type {|ty| ty.sub(sub) }
              method_type = method_type.update(
                type_params: method_params,
                type: method_type.type.with_return_type(Types::Bases::Instance.new(location: nil))
              )

              Definition::Method::TypeDef.new(
                type: method_type,
                member: initialize_def.member,
                defined_in: nil,
                implemented_in: nil
              )
            end,
            accessibility: :public
          )
        end
      end

      entry.decls.each do |d|
        each_member_with_accessibility(d.decl.members) do |member, _|
          case member
          when AST::Members::ClassInstanceVariable
            definition.instance_variables[member.name] = Definition::Variable.new(
              parent_variable: nil,
              type: member.type,
              declared_in: type_name
            )

          when AST::Members::ClassVariable
            definition.class_variables[member.name] = Definition::Variable.new(
              parent_variable: nil,
              type: member.type,
              declared_in: type_name
            )
          end
        end
      end
    end
  end
end

#build_singleton(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 434

def build_singleton(type_name)
  try_cache type_name, cache: singleton_cache do
    entry = env.class_decls[type_name] or raise "Unknown name for build_singleton: #{type_name}"

    case entry
    when Environment::ClassEntry, Environment::ModuleEntry
      ancestors = singleton_ancestors(type_name)
      self_type = Types::ClassSingleton.new(name: type_name, location: nil)
      instance_type = Types::ClassInstance.new(
        name: type_name,
        args: Types::Variable.build(entry.type_params.each.map(&:name)),
        location: nil
      )

      definition_pairs = ancestors.ancestors.map do |ancestor|
        case ancestor
        when Definition::Ancestor::Instance
          [ancestor, build_one_instance(ancestor.name)]
        when Definition::Ancestor::Singleton
          definition = build_one_singleton(ancestor.name)
          definition = definition.sub(Substitution.build([], [], instance_type: instance_type))
          definition = definition.map_method_type do |method_type|
            s = Substitution.build(
              method_type.free_variables.to_a,
              method_type.free_variables.map { Types::Bases::Any.new(location: nil) }
            )
            method_type.sub(s)
          end

          [
            ancestor,
            definition
          ]
        else
          raise
        end
      end

      merge_definitions(type_name, definition_pairs, entry: entry, self_type: self_type, ancestors: ancestors)
    else
      raise
    end
  end
end

#each_member_with_accessibility(members, accessibility: :public) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 375

def each_member_with_accessibility(members, accessibility: :public)
  members.each do |member|
    case member
    when AST::Members::Public
      accessibility = :public
    when AST::Members::Private
      accessibility = :private
    else
      yield member, accessibility
    end
  end
end

#expand_alias(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 1112

def expand_alias(type_name)
  entry = env.alias_decls[type_name] or raise "Unknown name for expand_alias: #{type_name}"
  entry.decl.type
end

#instance_ancestors(type_name, building_ancestors: []) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 269

def instance_ancestors(type_name, building_ancestors: [])
  as = instance_ancestors_cache[type_name] and return as

  entry = env.class_decls[type_name] or raise "Unknown name for instance_ancestors: #{type_name}"
  params = entry.type_params.each.map(&:name)
  args = Types::Variable.build(params)
  self_ancestor = Definition::Ancestor::Instance.new(name: type_name, args: args)

  RecursiveAncestorError.check!(self_ancestor,
                                ancestors: building_ancestors,
                                location: entry.primary.decl.location)
  building_ancestors.push self_ancestor

  one_ancestors = one_instance_ancestors(type_name)

  ancestors = []

  case entry
  when Environment::ClassEntry
    if one_ancestors.super_class
      super_name = one_ancestors.super_class.name
      super_args = one_ancestors.super_class.args

      super_ancestors = instance_ancestors(super_name, building_ancestors: building_ancestors)
      ancestors.unshift(*super_ancestors.apply(super_args, location: entry.primary.decl.location))
    end
  end

  one_ancestors.included_modules.each do |mod|
    if mod.name.class?
      name = mod.name
      args = mod.args
      mod_ancestors = instance_ancestors(name, building_ancestors: building_ancestors)
      ancestors.unshift(*mod_ancestors.apply(args, location: entry.primary.decl.location))
    end
  end

  ancestors.unshift(self_ancestor)

  one_ancestors.prepended_modules.each do |mod|
    if mod.name.class?
      name = mod.name
      args = mod.args
      mod_ancestors = instance_ancestors(name, building_ancestors: building_ancestors)
      ancestors.unshift(*mod_ancestors.apply(args, location: entry.primary.decl.location))
    end
  end

  building_ancestors.pop

  instance_ancestors_cache[type_name] = Definition::InstanceAncestors.new(
    type_name: type_name,
    params: params,
    ancestors: ancestors
  )
end

#merge_definitions(type_name, pairs, entry:, self_type:, ancestors:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 955

def merge_definitions(type_name, pairs, entry:, self_type:, ancestors:)
  Definition.new(type_name: type_name, entry: entry, self_type: self_type, ancestors: ancestors).tap do |definition|
    pairs.reverse_each do |(ancestor, current_definition)|
      sub = case ancestor
            when Definition::Ancestor::Instance
              Substitution.build(current_definition.type_params, ancestor.args)
            when Definition::Ancestor::Singleton
              Substitution.build([], [])
            end

      current_definition.methods.each do |name, method|
        merge_method definition.methods, name, method, sub
      end

      current_definition.instance_variables.each do |name, variable|
        merge_variable definition.instance_variables, name, variable
      end

      current_definition.class_variables.each do |name, variable|
        merge_variable definition.class_variables, name, variable
      end
    end
  end
end

#merge_method(methods, name, method, sub) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 990

def merge_method(methods, name, method, sub)
  super_method = methods[name]

  methods[name] = Definition::Method.new(
    super_method: super_method,
    accessibility: method.accessibility,
    defs: sub.mapping.empty? ? method.defs : method.defs.map {|defn| defn.update(type: defn.type.sub(sub)) }
  )
end

#merge_variable(variables, name, variable) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 980

def merge_variable(variables, name, variable)
  super_variable = variables[name]

  variables[name] = Definition::Variable.new(
    parent_variable: super_variable,
    type: variable.type,
    declared_in: variable.declared_in
  )
end

#method_definition_members(type_name, entry, kind:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 479

def method_definition_members(type_name, entry, kind:)
  interface_methods = {}
  methods = {}

  entry.decls.each do |d|
    each_member_with_accessibility(d.decl.members) do |member, accessibility|
      case member
      when AST::Members::MethodDefinition
        case kind
        when :singleton
          next unless member.singleton?
        when :instance
          next unless member.instance?
        end

        methods[member.name] ||= []
        methods[member.name] << [
          member.update(types: member.types),
          accessibility
        ]
      when AST::Members::Include, AST::Members::Extend
        if member.name.interface?
          if (kind == :instance && member.is_a?(AST::Members::Include)) || (kind == :singleton && member.is_a?(AST::Members::Extend))
            NoMixinFoundError.check!(member.name, env: env, member: member)

            interface_name = member.name
            interface_args = member.args

            interface_definition = build_interface(interface_name)

            InvalidTypeApplicationError.check!(
              type_name: interface_name,
              args: interface_args,
              params: interface_definition.type_params_decl,
              location: member.location
            )

            sub = Substitution.build(interface_definition.type_params, interface_args)

            interface_definition.methods.each do |name, method|
              interface_methods[name] = [method.sub(sub), member]
            end
          end
        end
      end
    end
  end

  result = {}

  interface_methods.each do |name, pair|
    method_definition, _ = pair
    result[name] = [:public, method_definition]
  end

  methods.each do |method_name, array|
    if result[method_name]
      unless array.all? {|pair| pair[0].overload? }
        raise MethodDefinitionConflictWithInterfaceMixinError.new(
          type_name: type_name,
          method_name: method_name,
          kind: :instance,
          mixin_member: interface_methods[method_name][1],
          entries: array.map(&:first)
        )
      end

      unless array.all? {|pair| pair[1] == :public}
        raise InconsistentMethodVisibilityError.new(
          type_name: type_name,
          method_name: method_name,
          kind: :instance,
          member_pairs: array
        )
      end

      result[method_name] += array.map(&:first)
    else
      case
      when array.size == 1 && !array[0][0].overload?
        member, visibility = array[0]
        result[method_name] = [visibility, nil, member]

      when array.count {|pair| !pair[0].overload? } == 1
        visibilities = array.group_by {|pair| pair[1] }

        if visibilities.size > 1
          raise InconsistentMethodVisibilityError.new(
            type_name: type_name,
            method_name: method_name,
            kind: :instance,
            member_pairs: array
          )
        end

        overloads, primary = array.map(&:first).partition(&:overload?)
        result[method_name] = [array[0][1], nil, *primary, *overloads]

      else
        raise InvalidOverloadMethodError.new(
          type_name: type_name,
          method_name: method_name,
          kind: :instance,
          members: array.map(&:first)
        )
      end
    end
  end

  result
end

#mixin_ancestors(entry, included_modules:, extended_modules:, prepended_modules:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 224

def mixin_ancestors(entry, included_modules:, extended_modules:, prepended_modules:)
  entry.decls.each do |d|
    decl = d.decl

    align_params = Substitution.build(
      decl.type_params.each.map(&:name),
      Types::Variable.build(entry.type_params.each.map(&:name))
    )

    decl.each_mixin do |member|
      case member
      when AST::Members::Include
        if included_modules
          NoMixinFoundError.check!(member.name, env: env, member: member)

          module_name = member.name
          module_args = member.args.map {|type| type.sub(align_params) }

          included_modules << Definition::Ancestor::Instance.new(name: module_name, args: module_args)
        end

      when AST::Members::Prepend
        if prepended_modules
          NoMixinFoundError.check!(member.name, env: env, member: member)

          module_name = member.name
          module_args = member.args.map {|type| type.sub(align_params) }

          prepended_modules << Definition::Ancestor::Instance.new(name: module_name, args: module_args)
        end

      when AST::Members::Extend
        if extended_modules
          NoMixinFoundError.check!(member.name, env: env, member: member)

          module_name = member.name
          module_args = member.args

          extended_modules << Definition::Ancestor::Instance.new(name: module_name, args: module_args)
        end
      end
    end
  end
end

#one_instance_ancestors(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 122

def one_instance_ancestors(type_name)
  as = one_instance_ancestors_cache[type_name] and return as

  entry = env.class_decls[type_name] or raise "Unknown name for one_instance_ancestors: #{type_name}"
  params = entry.type_params.each.map(&:name)

  case entry
  when Environment::ClassEntry
    validate_super_class!(type_name, entry)
    primary = entry.primary
    super_class = primary.decl.super_class

    if type_name != BuiltinNames::BasicObject.name
      if super_class
        super_name = super_class.name
        super_args = super_class.args
      else
        super_name = BuiltinNames::Object.name
        super_args = []
      end

      NoSuperclassFoundError.check!(super_name, env: env, location: primary.decl.location)

      ancestors = OneAncestors.class_instance(
        type_name: type_name,
        params: params,
        super_class: Definition::Ancestor::Instance.new(name: super_name, args: super_args)
      )
    else
      ancestors = OneAncestors.class_instance(
        type_name: type_name,
        params: params,
        super_class: nil
      )
    end
  when Environment::ModuleEntry
    ancestors = OneAncestors.module_instance(type_name: type_name, params: params)

    entry.self_types.each do |module_self|
      NoSelfTypeFoundError.check!(module_self, env: env)
      ancestors.self_types.push Definition::Ancestor::Instance.new(name: module_self.name, args: module_self.args)
    end
  else
    raise "Unexpected entry for: #{type_name}"
  end

  mixin_ancestors(entry,
                  included_modules: ancestors.included_modules,
                  prepended_modules: ancestors.prepended_modules,
                  extended_modules: nil)

  one_instance_ancestors_cache[type_name] = ancestors
end

#one_singleton_ancestors(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 176

def one_singleton_ancestors(type_name)
  as = one_singleton_ancestors_cache[type_name] and return as

  entry = env.class_decls[type_name] or raise "Unknown name for one_singleton_ancestors: #{type_name}"

  case entry
  when Environment::ClassEntry
    validate_super_class!(type_name, entry)
    primary = entry.primary
    super_class = primary.decl.super_class

    if type_name != BuiltinNames::BasicObject.name
      if super_class
        super_name = super_class.name
      else
        super_name = BuiltinNames::Object.name
      end

      NoSuperclassFoundError.check!(super_name, env: env, location: primary.decl.location)

      ancestors = OneAncestors.singleton(
        type_name: type_name,
        super_class: Definition::Ancestor::Singleton.new(name: super_name)
      )
    else
      ancestors = OneAncestors.singleton(
        type_name: type_name,
        super_class: Definition::Ancestor::Instance.new(name: BuiltinNames::Class.name, args: [])
      )
    end
  when Environment::ModuleEntry
    ancestors = OneAncestors.singleton(
      type_name: type_name,
      super_class: Definition::Ancestor::Instance.new(name: BuiltinNames::Module.name, args: [])
    )

  else
    raise "Unexpected entry for: #{type_name}"
  end

  mixin_ancestors(entry,
                  included_modules: nil,
                  prepended_modules: nil,
                  extended_modules: ancestors.extended_modules)

  one_singleton_ancestors_cache[type_name] = ancestors
end

#singleton_ancestors(type_name, building_ancestors: []) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 326

def singleton_ancestors(type_name, building_ancestors: [])
  as = singleton_ancestor_cache[type_name] and return as

  entry = env.class_decls[type_name] or raise "Unknown name for singleton_ancestors: #{type_name}"
  self_ancestor = Definition::Ancestor::Singleton.new(name: type_name)

  RecursiveAncestorError.check!(self_ancestor,
                                ancestors: building_ancestors,
                                location: entry.primary.decl.location)
  building_ancestors.push self_ancestor

  one_ancestors = one_singleton_ancestors(type_name)

  ancestors = []

  case one_ancestors.super_class
  when Definition::Ancestor::Instance
    super_name = one_ancestors.super_class.name
    super_args = one_ancestors.super_class.args

    super_ancestors = instance_ancestors(super_name, building_ancestors: building_ancestors)
    ancestors.unshift(*super_ancestors.apply(super_args, location: entry.primary.decl.location))

  when Definition::Ancestor::Singleton
    super_name = one_ancestors.super_class.name

    super_ancestors = singleton_ancestors(super_name, building_ancestors: [])
    ancestors.unshift(*super_ancestors.ancestors)
  end

  one_ancestors.extended_modules.each do |mod|
    if mod.name.class?
      name = mod.name
      args = mod.args
      mod_ancestors = instance_ancestors(name, building_ancestors: building_ancestors)
      ancestors.unshift(*mod_ancestors.apply(args, location: entry.primary.decl.location))
    end
  end

  ancestors.unshift(self_ancestor)

  building_ancestors.pop

  singleton_ancestor_cache[type_name] = Definition::SingletonAncestors.new(
    type_name: type_name,
    ancestors: ancestors
  )
end

#try_cache(type_name, cache:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 1000

def try_cache(type_name, cache:)
  cached = cache[type_name]

  case cached
  when Definition
    cached
  when false
    raise
  when nil
    cache[type_name] = false
    begin
      cache[type_name] = yield
    rescue => ex
      cache[type_name] = nil
      raise ex
    end
  end
end

#validate_parameter_variance(decl:, methods:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 763

def validate_parameter_variance(decl:, methods:)
  type_params = decl.type_params

  calculator = VarianceCalculator.new(builder: self)
  param_names = type_params.each.map(&:name)

  errors = []

  if decl.is_a?(AST::Declarations::Class)
    if decl.super_class
      super_class = decl.super_class
      result = calculator.in_inherit(name: super_class.name, args: super_class.args, variables: param_names)

      validate_params_with type_params, result: result do |param|
        errors.push InvalidVarianceAnnotationError::InheritanceError.new(
          param: param
        )
      end
    end
  end

  decl.members.each do |member|
    case member
    when AST::Members::Include
      if member.name.class?
        result = calculator.in_inherit(name: member.name, args: member.args, variables: param_names)

        validate_params_with type_params, result: result do |param|
          errors.push InvalidVarianceAnnotationError::MixinError.new(
            include_member: member,
            param: param
          )
        end
      end
    end
  end

  methods.each do |name, method|
    method.method_types.each do |method_type|
      case method_type
      when MethodType
        result = calculator.in_method_type(method_type: method_type, variables: param_names)

        validate_params_with type_params, result: result do |param|
          errors.push InvalidVarianceAnnotationError::MethodTypeError.new(
            method_name: name,
            method_type: method_type,
            param: param
          )
        end
      end
    end
  end

  unless errors.empty?
    raise InvalidVarianceAnnotationError.new(decl: decl, errors: errors)
  end
end

#validate_params_with(type_params, result:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 753

def validate_params_with(type_params, result:)
  type_params.each do |param|
    unless param.skip_validation
      unless result.compatible?(param.name, with_annotation: param.variance)
        yield param
      end
    end
  end
end

#validate_super_class!(type_name, entry) ⇒ Object

Raises:



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# File 'lib/rbs/definition_builder.rb', line 105

def validate_super_class!(type_name, entry)
  with_super_classes = entry.decls.select {|d| d.decl.super_class }

  return if with_super_classes.size <= 1

  super_types = with_super_classes.map do |d|
    super_class = d.decl.super_class
    Types::ClassInstance.new(name: super_class.name, args: super_class.args, location: nil)
  end

  super_types.uniq!

  return if super_types.size == 1

  raise SuperclassMismatchError.new(name: type_name, super_classes: super_types, entry: entry)
end