Class: Steep::Signature::Validator

Inherits:
Object
  • Object
show all
Defined in:
lib/steep/signature/validator.rb

Constant Summary collapse

Location = 
RBS::Location
Declarations = 
RBS::AST::Declarations

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(checker:) ⇒ Validator

Returns a new instance of Validator.



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# File 'lib/steep/signature/validator.rb', line 10

def initialize(checker:)
  @checker = checker
  @errors = []
  @context = []
end

Instance Attribute Details

#checker ⇒ Object (readonly)

Returns the value of attribute checker.



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# File 'lib/steep/signature/validator.rb', line 7

def checker
  @checker
end

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/steep/signature/validator.rb', line 8

def context
  @context
end

Instance Method Details

#ancestor_to_type(ancestor) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 160

def ancestor_to_type(ancestor)
  case ancestor
  when RBS::Definition::Ancestor::Instance
    args = ancestor.args.map {|type| checker.factory.type(type) }

    case
    when ancestor.name.interface?
      AST::Types::Name::Interface.new(name: ancestor.name, args: args)
    when ancestor.name.class?
      AST::Types::Name::Instance.new(name: ancestor.name, args: args)
    else
      raise "#{ancestor.name}"
    end
  else
    raise "Unexpected ancestor: #{ancestor.inspect}"
  end
end

#builder ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 47

def builder
  checker.factory.definition_builder
end

#each_error(&block) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 35

def each_error(&block)
  if block
    @errors.each(&block)
  else
    enum_for :each_error
  end
end

#each_method_type(definition) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 210

def each_method_type(definition)
  type_name = definition.type_name

  definition.methods.each_value do |method|
    if method.defined_in == type_name
      method.method_types.each do |method_type|
        yield method_type
      end
    end
  end
end

#each_variable_type(definition) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 222

def each_variable_type(definition)
  type_name = definition.type_name

  definition.instance_variables.each_value do |var|
    if var.declared_in == type_name
      yield var.type
    end
  end

  definition.class_variables.each_value do |var|
    if var.declared_in == type_name
      yield var.type
    end
  end
end

#env ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 43

def env
  checker.factory.env
end

#factory ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 59

def factory
  checker.factory
end

#has_error? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/steep/signature/validator.rb', line 27

def has_error?
  !no_error?
end

#latest_context ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 23

def latest_context
  context.last || [nil, nil, nil]
end

#mixin_constraints(definition, mixin_ancestors, immediate_self_types:) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 178

def mixin_constraints(definition, mixin_ancestors, immediate_self_types:)
  # @type var relations: Array[[Subtyping::Relation[AST::Types::t], RBS::Definition::Ancestor::Instance]]
  relations = []

  self_type = checker.factory.type(definition.self_type)
  if immediate_self_types && !immediate_self_types.empty?
    # @type var sts: Array[AST::Types::t]
    sts = immediate_self_types.map {|st| ancestor_to_type(st) }
    self_type = AST::Types::Intersection.build(types: sts.push(self_type))
  end

  mixin_ancestors.each do |ancestor|
    args = ancestor.args.map {|type| checker.factory.type(type) }
    ancestor_ancestors = builder.ancestor_builder.one_instance_ancestors(ancestor.name)
    ancestor_ancestors.self_types or raise
    ancestor_ancestors.params or raise
    self_constraints = ancestor_ancestors.self_types.map do |self_ancestor|
      s = Interface::Substitution.build(ancestor_ancestors.params, args)
      ancestor_to_type(self_ancestor).subst(s)
    end

    self_constraints.each do |constraint|
      relations << [
        Subtyping::Relation.new(sub_type: self_type, super_type: constraint),
        ancestor
      ]
    end
  end

  relations
end

#no_error? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/steep/signature/validator.rb', line 31

def no_error?
  @errors.empty?
end

#push_context(self_type: , class_type: , instance_type: ) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 16

def push_context(self_type: latest_context[0], class_type: latest_context[1], instance_type: latest_context[2])
  @context.push([self_type, class_type, instance_type])
  yield
ensure
  @context.pop
end

#rescue_validation_errors(type_name = nil) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 644

def rescue_validation_errors(type_name = nil)
  yield
rescue RBS::BaseError => exn
  @errors << Diagnostic::Signature.from_rbs_error(exn, factory: factory)
end

#type_name_resolver ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 51

def type_name_resolver
  @type_name_resolver ||= RBS::Resolver::TypeNameResolver.new(env)
end

#validate ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 63

def validate
  @errors = []

  validate_decl
  validate_const
  validate_global
  validate_alias
end

#validate_alias ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 638

def validate_alias
  env.type_alias_decls.each do |name, entry|
    validate_one_alias(name, entry)
  end
end

#validate_ancestor_application(name, ancestor) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 473

def validate_ancestor_application(name, ancestor)
  unless ancestor.args.empty?
    definition =
      case
      when ancestor.name.class?
        builder.build_instance(ancestor.name)
      when ancestor.name.interface?
        builder.build_interface(ancestor.name)
      else
        raise
      end

    location =
      case ancestor.source
      when :super
        primary_decl = env.class_decls.fetch(name).primary.decl
        primary_decl.is_a?(RBS::AST::Declarations::Class) or raise
        if super_class = primary_decl.super_class
          super_class.location
        else
          # Implicit super class (Object): this can be skipped in fact...
          primary_decl.location&.aref(:name)
        end
      else
        ancestor.source&.location
      end

    validate_type_application_constraints(
      ancestor.name,
      definition.type_params_decl,
      ancestor.args,
      location: location
    )

    ancestor.args.each do |arg|
      validate_type(arg)
    end
  end
end

#validate_const ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 570

def validate_const
  env.constant_decls.each do |name, entry|
    validate_one_constant(name, entry)
  end
end

#validate_decl ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 556

def validate_decl
  env.class_decls.each_key do |name|
    validate_one_class(name)
  end

  env.class_alias_decls.each do |name, entry|
    validate_one_class_alias(name, entry)
  end

  env.interface_decls.each_key do |name|
    validate_one_interface(name)
  end
end

#validate_definition_type(definition) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 238

def validate_definition_type(definition)
  each_method_type(definition) do |method_type|
    upper_bounds = method_type.type_params.each.with_object({}) do |param, hash| #$ Hash[Symbol, AST::Types::t?]
      hash[param.name] = factory.type_opt(param.upper_bound_type)
    end

    checker.push_variable_bounds(upper_bounds) do
      method_type.each_type do |type|
        validate_type(type)
      end
    end
  end

  each_variable_type(definition) do |type|
    validate_type(type)
  end
end

#validate_global ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 584

def validate_global
  env.global_decls.each do |name, entry|
    validate_one_global(name, entry)
  end
end

#validate_one_alias(name, entry = env.type_alias_decls.fetch(name)) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 597

def validate_one_alias(name, entry = env.type_alias_decls.fetch(name))
  *, inner_most_outer_module = entry.outer
  if inner_most_outer_module
    class_type = AST::Types::Name::Singleton.new(name: inner_most_outer_module.name)
    instance_type = AST::Types::Name::Instance.new(
      name: inner_most_outer_module.name,
      args: inner_most_outer_module.type_params.map { AST::Types::Any.instance() },
    )
  end

  push_context(class_type: class_type, instance_type: instance_type, self_type: nil) do
    rescue_validation_errors(name) do
      Steep.logger.debug "Validating alias `#{name}`..."

      unless name.namespace.empty?
        outer = name.namespace.to_type_name
        builder.validate_type_name(outer, entry.decl.location&.aref(:name))
      end

      validate_type_params(name, entry.decl.type_params)

      upper_bounds = entry.decl.type_params.each.with_object({}) do |param, bounds| #$ Hash[Symbol, AST::Types::t?]
        bounds[param.name] = factory.type_opt(param.upper_bound_type)
      end

      validator.validate_type_alias(entry: entry) do |type|
        checker.push_variable_bounds(upper_bounds) do
          validate_type(entry.decl.type)
        end
      end
    end
  end
end

#validate_one_class(name) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 462

def validate_one_class(name)
  entry = env.constant_entry(name)

  case entry
  when RBS::Environment::ClassEntry, RBS::Environment::ModuleEntry
    validate_one_class_decl(name, entry)
  when RBS::Environment::ClassAliasEntry, RBS::Environment::ModuleAliasEntry
    validate_one_class_alias(name, entry)
  end
end

#validate_one_class_alias(name, entry) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 631

def validate_one_class_alias(name, entry)
  rescue_validation_errors(name) do
    Steep.logger.debug "Validating class/module alias `#{name}`..."
    validator.validate_class_alias(entry: entry)
  end
end

#validate_one_class_decl(name, entry) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 289

def validate_one_class_decl(name, entry)
  rescue_validation_errors(name) do
    Steep.logger.debug { "Validating class definition `#{name}`..." }

    class_type = AST::Types::Name::Singleton.new(name: name)
    instance_type = AST::Types::Name::Instance.new(
      name: name,
      args: entry.type_params.map { AST::Types::Any.instance() }
    )

    Steep.logger.tagged "#{name}" do
      builder.build_instance(name).tap do |definition|
        upper_bounds = definition.type_params_decl.each.with_object({}) do |param, bounds| #$ Hash[Symbol, AST::Types::t?]
          bounds[param.name] = factory.type_opt(param.upper_bound_type)
        end

        self_type = AST::Types::Name::Instance.new(
          name: name,
          args: entry.type_params.map { AST::Types::Var.new(name: _1.name) }
        )

        push_context(self_type: self_type, class_type: class_type, instance_type: instance_type) do
          checker.push_variable_bounds(upper_bounds) do
            definition.instance_variables.each do |name, var|
              if parent = var.parent_variable
                var_type = checker.factory.type(var.type)
                parent_type = checker.factory.type(parent.type)

                relation = Subtyping::Relation.new(sub_type: var_type, super_type: parent_type)
                result1 = checker.check(relation, self_type: nil, instance_type: nil, class_type: nil, constraints: Subtyping::Constraints.empty)
                result2 = checker.check(relation.flip, self_type: nil, instance_type: nil, class_type: nil, constraints: Subtyping::Constraints.empty)

                unless result1.success? and result2.success?
                  @errors << Diagnostic::Signature::InstanceVariableTypeError.new(
                    name: name,
                    location: var.type.location,
                    var_type: var_type,
                    parent_type: parent_type
                  )
                end
              end
            end

            ancestors = builder.ancestor_builder.one_instance_ancestors(name)
            mixin_constraints(definition, ancestors.included_modules || raise, immediate_self_types: ancestors.self_types).each do |relation, ancestor|
              checker.check(
                relation,
                self_type: AST::Types::Self.instance,
                instance_type: AST::Types::Instance.instance,
                class_type: AST::Types::Class.instance,
                constraints: Subtyping::Constraints.empty
              ).else do
                raise if ancestor.source.is_a?(Symbol)

                @errors << Diagnostic::Signature::ModuleSelfTypeError.new(
                  name: name,
                  location: ancestor.source&.location || raise,
                  ancestor: ancestor,
                  result: _1
                )
              end
            end

            ancestors.each_ancestor do |ancestor|
              case ancestor
              when RBS::Definition::Ancestor::Instance
                validate_ancestor_application(name, ancestor)
              end
            end

            validate_definition_type(definition)
          end
        end
      end

      builder.build_singleton(name).tap do |definition|
        entry =
          case definition.entry
          when RBS::Environment::ClassEntry, RBS::Environment::ModuleEntry
            definition.entry
          else
            raise
          end

        push_context(self_type: class_type, class_type: class_type, instance_type: instance_type) do
          definition.instance_variables.each do |name, var|
            if parent = var.parent_variable
              var_type = checker.factory.type(var.type)
              parent_type = checker.factory.type(parent.type)

              relation = Subtyping::Relation.new(sub_type: var_type, super_type: parent_type)
              result1 = checker.check(
                relation,
                self_type: AST::Types::Self.instance,
                instance_type: AST::Types::Instance.instance,
                class_type: AST::Types::Class.instance,
                constraints: Subtyping::Constraints.empty
              )
              result2 = checker.check(
                relation.flip,
                self_type: AST::Types::Self.instance,
                instance_type: AST::Types::Instance.instance,
                class_type: AST::Types::Class.instance,
                constraints: Subtyping::Constraints.empty
              )

              unless result1.success? and result2.success?
                @errors << Diagnostic::Signature::InstanceVariableTypeError.new(
                  name: name,
                  location: var.type.location,
                  var_type: var_type,
                  parent_type: parent_type
                )
              end
            end
          end

          definition.class_variables.each do |name, var|
            if var.declared_in == definition.type_name
              if (parent = var.parent_variable) && var.declared_in != parent.declared_in
                class_var = entry.decls.flat_map {|decl| decl.decl.members }.find do |member|
                  member.is_a?(RBS::AST::Members::ClassVariable) && member.name == name
                end

                if class_var
                  loc = class_var.location #: RBS::Location[untyped, untyped]?
                  @errors << Diagnostic::Signature::ClassVariableDuplicationError.new(
                    class_name: definition.type_name,
                    other_class_name: parent.declared_in,
                    variable_name: name,
                    location: loc&.[](:name) || raise
                  )
                end
              end
            end
          end

          ancestors = builder.ancestor_builder.one_singleton_ancestors(name)
          ancestors.extended_modules or raise
          mixin_constraints(definition, ancestors.extended_modules, immediate_self_types: ancestors.self_types).each do |relation, ancestor|
            checker.check(
              relation,
              self_type: AST::Types::Self.instance ,
              instance_type: AST::Types::Instance.instance,
              class_type: AST::Types::Class.instance,
              constraints: Subtyping::Constraints.empty
            ).else do
              raise if ancestor.source.is_a?(Symbol)

              @errors << Diagnostic::Signature::ModuleSelfTypeError.new(
                name: name,
                location: ancestor.source&.location || raise,
                ancestor: ancestor,
                result: _1
              )
            end
          end
          ancestors.each_ancestor do |ancestor|
            case ancestor
            when RBS::Definition::Ancestor::Instance
              validate_ancestor_application(name, ancestor)
            end
          end

          validate_definition_type(definition)
        end
      end

      validate_type_params(name, entry.type_params)
    end
  end
end

#validate_one_constant(name, entry) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 576

def validate_one_constant(name, entry)
  rescue_validation_errors do
    Steep.logger.debug "Validating constant `#{name}`..."
    builder.ensure_namespace!(name.namespace, location: entry.decl.location)
    validate_type entry.decl.type
  end
end

#validate_one_global(name, entry) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 590

def validate_one_global(name, entry)
  rescue_validation_errors do
    Steep.logger.debug "Validating global `#{name}`..."
    validate_type entry.decl.type
  end
end

#validate_one_interface(name) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 513

def validate_one_interface(name)
  rescue_validation_errors(name) do
    Steep.logger.debug "Validating interface `#{name}`..."
    Steep.logger.tagged "#{name}" do
      definition = builder.build_interface(name)

      validate_type_params(name, definition.type_params_decl)

      upper_bounds = definition.type_params_decl.each.with_object({}) do |param, bounds| #$ Hash[Symbol, AST::Types::t?]
        bounds[param.name] = factory.type_opt(param.upper_bound_type)
      end

      self_type = AST::Types::Name::Interface.new(
        name: name,
        args: definition.type_params.map { AST::Types::Var.new(name: _1) }
      )

      push_context(self_type: self_type, class_type: nil, instance_type: nil) do
        checker.push_variable_bounds(upper_bounds) do
          validate_definition_type(definition)

          ancestors = builder.ancestor_builder.one_interface_ancestors(name)
          ancestors.each_ancestor do |ancestor|
            case ancestor
            when RBS::Definition::Ancestor::Instance
              # Interface ancestor cannot be other than Interface
              ancestor.source.is_a?(Symbol) and raise

              defn = builder.build_interface(ancestor.name)
              validate_type_application_constraints(
                ancestor.name,
                defn.type_params_decl,
                ancestor.args,
                location: ancestor.source&.location || raise
              )
            end
          end
        end
      end
    end
  end
end

#validate_type(type) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 153

def validate_type(type)
  Steep.logger.debug { "#{Location.to_string type.location}: Validating #{type}..." }

  validator.validate_type(type, context: nil)
  validate_type_application(type)
end

#validate_type_application(type) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 116

def validate_type_application(type)
  name, type_params, type_args =
    case type
    when RBS::Types::ClassInstance
      [
        type.name,
        builder.build_instance(type.name).type_params_decl,
        type.args
      ]
    when RBS::Types::Interface
      [
        type.name,
        builder.build_interface(type.name).type_params_decl,
        type.args
      ]
    when RBS::Types::Alias
      type_name = env.normalize_type_name?(type.name) or return
      entry = env.type_alias_decls.fetch(type_name)

      [
        type_name,
        entry.decl.type_params,
        type.args
      ]
    end

  if name && type_params && type_args
    if !type_params.empty? && !type_args.empty?
      validate_type_application_constraints(name, type_params, type_args, location: type.location)
    end
  end

  type.each_type do |child|
    validate_type_application(child)
  end
end

#validate_type_application_constraints(type_name, type_params, type_args, location:) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 72

def validate_type_application_constraints(type_name, type_params, type_args, location:)
  if type_params.size == type_args.size
    subst = Interface::Substitution.build(
      type_params.map(&:name),
      type_args.map {|type| factory.type(type) }
    )

    type_params.zip(type_args).each do |param, arg|
      arg or raise

      if param.upper_bound_type
        upper_bound_type = factory.type(param.upper_bound_type).subst(subst)
        arg_type = factory.type(arg)

        constraints = Subtyping::Constraints.empty

        self_type, class_type, instance_type = latest_context

        checker.check(
          Subtyping::Relation.new(sub_type: arg_type, super_type: upper_bound_type),
          self_type: self_type,
          class_type: class_type,
          instance_type: instance_type,
          constraints: constraints
        ).else do |result|
          @errors << Diagnostic::Signature::UnsatisfiableTypeApplication.new(
            type_name: type_name,
            type_arg: arg_type,
            type_param: Interface::TypeParam.new(
              name: param.name,
              upper_bound: upper_bound_type,
              variance: param.variance,
              unchecked: param.unchecked?,
              default_type: factory.type_opt(param.default_type)
            ),
            result: result,
            location: location
          )
        end
      end
    end
  end
end

#validate_type_params(type_name, type_params) ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 256

def validate_type_params(type_name, type_params)
  if error_type_params = RBS::AST::TypeParam.validate(type_params)
    error_type_params.each do |type_param|
      default_type = type_param.default_type or raise
      @errors << Diagnostic::Signature::TypeParamDefaultReferenceError.new(type_param, location: default_type.location)
    end
  end

  upper_bounds = type_params.each.with_object({}) do |param, bounds| #$ Hash[Symbol, AST::Types::t?]
    bounds[param.name] = factory.type_opt(param.upper_bound_type)
  end

  checker.push_variable_bounds(upper_bounds) do
    type_params.each do |type_param|
      param = checker.factory.type_param(type_param)

      default_type = param.default_type or next
      upper_bound = param.upper_bound or next

      relation = Subtyping::Relation.new(sub_type: default_type, super_type: upper_bound)
      result = checker.check(relation, self_type: nil, instance_type: nil, class_type: nil, constraints: Subtyping::Constraints.empty)

      if result.failure?
        @errors << Diagnostic::Signature::UnsatisfiableGenericsDefaultType.new(
          type_param.name,
          result,
          location: (type_param.default_type || raise).location
        )
      end
    end
  end
end

#validator ⇒ Object 



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# File 'lib/steep/signature/validator.rb', line 55

def validator
  @validator ||= RBS::Validator.new(env: env, resolver: type_name_resolver)
end