Class: Steep::Interface::Builder

Inherits:
Object
  • Object
show all
Defined in:
lib/steep/interface/builder.rb

Defined Under Namespace

Classes: RecursiveDefinitionError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(signatures:) ⇒ Builder

Returns a new instance of Builder.



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# File 'lib/steep/interface/builder.rb', line 23

def initialize(signatures:)
  @signatures = signatures
  @class_cache = {}
  @module_cache = {}
  @instance_cache = {}
  @interface_cache = {}
end

Instance Attribute Details

#class_cache ⇒ Object (readonly)

Returns the value of attribute class_cache.



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# File 'lib/steep/interface/builder.rb', line 18

def class_cache
  @class_cache
end

#instance_cache ⇒ Object (readonly)

Returns the value of attribute instance_cache.



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# File 'lib/steep/interface/builder.rb', line 20

def instance_cache
  @instance_cache
end

#interface_cache ⇒ Object (readonly)

Returns the value of attribute interface_cache.



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# File 'lib/steep/interface/builder.rb', line 21

def interface_cache
  @interface_cache
end

#module_cache ⇒ Object (readonly)

Returns the value of attribute module_cache.



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# File 'lib/steep/interface/builder.rb', line 19

def module_cache
  @module_cache
end

#signatures ⇒ Object (readonly)

Returns the value of attribute signatures.



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# File 'lib/steep/interface/builder.rb', line 17

def signatures
  @signatures
end

Instance Method Details

#absolute_type(type, current:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 31

def absolute_type(type, current:)
  case type
  when AST::Types::Name::Instance
    signature = signatures.find_class_or_module(type.name, current_module: current)
    AST::Types::Name::Instance.new(
      name: signature.name,
      args: type.args.map {|arg| absolute_type(arg, current: current) },
      location: type.location
    )
  when AST::Types::Name::Class
    signature = signatures.find_class(type.name, current_module: current)
    AST::Types::Name::Class.new(
      name: signature.name,
      constructor: type.constructor,
      location: type.location
    )
  when AST::Types::Name::Module
    signature = signatures.find_class_or_module(type.name, current_module: current)
    AST::Types::Name::Module.new(
      name: signature.name,
      location: type.location
    )
  when AST::Types::Name::Interface
    signature = signatures.find_interface(type.name, namespace: current)
    AST::Types::Name::Interface.new(
      name: signature.name,
      args: type.args.map {|arg| absolute_type(arg, current: current) },
      location: type.location
    )
  when AST::Types::Name::Alias
    signature = signatures.find_alias(type.name, namespace: current)
    AST::Types::Name::Alias.new(
      name: signature.name,
      args: type.args.map {|arg| absolute_type(arg, current: current) },
      location: type.location
    )
  when AST::Types::Union
    AST::Types::Union.build(
      types: type.types.map {|ty| absolute_type(ty, current: current) },
      location: type.location
    )
  when AST::Types::Intersection
    AST::Types::Intersection.build(
      types: type.types.map {|ty| absolute_type(ty, current: current) },
      location: type.location
    )
  when AST::Types::Tuple
    AST::Types::Tuple.new(
      types: type.types.map {|ty| absolute_type(ty, current:current) },
      location: type.location
    )
  when AST::Types::Proc
    AST::Types::Proc.new(
      params: type.params.map_type {|ty| absolute_type(ty, current: current) },
      return_type: absolute_type(type.return_type, current: current),
      location: type.location
    )
  when AST::Types::Record
    AST::Types::Record.new(
      elements: type.elements.transform_values {|ty| absolute_type(ty, current: current) },
      location: type.location
    )
  else
    type
  end
end

#add_method(type_name, method, methods:, extra_attributes: [], current:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 171

def add_method(type_name, method, methods:, extra_attributes: [], current:)
  super_method = methods[method.name]
  new_method = Method.new(
    type_name: type_name,
    name: method.name,
    types: method.types.map do |method_type|
      method_type_to_method_type(method_type, current: current)
    end,
    super_method: super_method,
    attributes: method.attributes + extra_attributes
  )

  methods[method.name] = if super_method&.include_in_chain?(new_method)
                           super_method
                         else
                           new_method
                         end
end

#assert_absolute_name!(name) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 115

def assert_absolute_name!(name)
  raise "Name should be absolute: #{name}" unless name.absolute?
end

#build_class(module_name, constructor:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 119

def build_class(module_name, constructor:)
  assert_absolute_name! module_name
  signature = signatures.find_class(module_name, current_module: AST::Namespace.root)
  cache_interface(class_cache, key: [signature.name, !!constructor]) do
    class_to_interface(signature, constructor: constructor)
  end
end

#build_instance(module_name, with_initialize:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 135

def build_instance(module_name, with_initialize:)
  assert_absolute_name! module_name
  signature = signatures.find_class_or_module(module_name, current_module: AST::Namespace.root)
  cache_interface(instance_cache, key: [signature.name, with_initialize]) do
    instance_to_interface(signature, with_initialize: with_initialize)
  end
end

#build_interface(interface_name) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 143

def build_interface(interface_name)
  signature = signatures.find_interface(interface_name)
  cache_interface(interface_cache, key: [signature.name]) do
    interface_to_interface(nil, signature)
  end
end

#build_module(module_name) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 127

def build_module(module_name)
  assert_absolute_name! module_name
  signature = signatures.find_module(module_name, current_module: AST::Namespace.root)
  cache_interface(module_cache, key: signature.name) do
    module_to_interface(signature)
  end
end

#cache_interface(cache, key:, &block) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 98

def cache_interface(cache, key:, &block)
  cached = cache[key]

  case cached
  when nil
    cache[key] = key
    cache[key] = yield
  when key
    raise RecursiveDefinitionError, key
  else
    cached
  end
rescue RecursiveDefinitionError => exn
  cache.delete key
  raise exn
end

#class_to_interface(sig, constructor:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 190

def class_to_interface(sig, constructor:)
  module_name = sig.name
  namespace = module_name.namespace.append(module_name.name)

  supers = []
  methods = {
    new: Method.new(
      type_name: Names::Module.parse(name: "__Builtin__"),
      name: :new,
      types: [
        MethodType.new(type_params: [],
                       params: Params.empty,
                       block: nil,
                       return_type: AST::Types::Instance.new,
                       location: nil
        )
      ],
      super_method: nil,
      attributes: [:incompatible]
    )
  }

  klass = build_instance(AST::Builtin::Class.module_name, with_initialize: false)
  instantiated = klass.instantiate(
    type: AST::Types::Self.new,
    args: [],
    instance_type: AST::Types::Instance.new,
    module_type: AST::Types::Class.new
  )
  methods.merge!(instantiated.methods)

  unless module_name == AST::Builtin::BasicObject.module_name
    super_class_name = sig.super_class&.name&.yield_self {|name| signatures.find_class(name, current_module: namespace).name } || AST::Builtin::Object.module_name
    class_interface = build_class(super_class_name, constructor: constructor)
    merge_mixin(class_interface, [], methods: methods, ivars: {}, supers: supers, current: namespace)
  end

  sig.members.each do |member|
    case member
    when AST::Signature::Members::Include
      member_name = signatures.find_module(member.name, current_module: namespace).name
      build_module(member_name).yield_self do |module_interface|
        merge_mixin(module_interface,
                    [],
                    methods: methods,
                    supers: supers,
                    ivars: {},
                    current: namespace)
      end
    when AST::Signature::Members::Extend
      member_name = signatures.find_module(member.name, current_module: namespace).name
      build_instance(member_name, with_initialize: false).yield_self do |module_interface|
        merge_mixin(module_interface,
                    member.args.map {|type| absolute_type(type, current: namespace) },
                    methods: methods,
                    ivars: {},
                    supers: supers,
                    current: namespace)
      end
    end
  end

  sig.members.each do |member|
    case member
    when AST::Signature::Members::Method
      case
      when member.module_method?
        add_method(module_name, member, methods: methods, current: namespace)
      when member.instance_method? && member.name == :initialize
        if constructor
          methods[:new] = Method.new(
            type_name: module_name,
            name: :new,
            types: member.types.map do |method_type_sig|
              method_type = method_type_to_method_type(method_type_sig, current: namespace).with(return_type: AST::Types::Instance.new)
              args = (sig.params&.variables || []) + method_type.type_params

              method_type.with(
                type_params: args,
                return_type: AST::Types::Instance.new
              )
            end,
            super_method: nil,
            attributes: [:incompatible]
          )
        end
      end
    end
  end

  signatures.find_extensions(sig.name).each do |ext|
    ext.members.each do |member|
      case member
      when AST::Signature::Members::Method
        if member.module_method?
          add_method(module_name, member, methods: methods, current: namespace)
        end
      end
    end
  end

  if methods[:new]&.type_name == AST::Builtin::Class.module_name
    new_types = [MethodType.new(type_params: [],
                                params: Params.empty,
                                block: nil,
                                return_type: AST::Types::Instance.new,
                                location: nil)]
    methods[:new] = methods[:new].with_types(new_types)
  end

  unless constructor
    methods.delete(:new)
  end

  Abstract.new(
    name: module_name,
    params: [],
    methods: methods,
    supers: supers,
    ivar_chains: {}
  )
end

#instance_to_interface(sig, with_initialize:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 390

def instance_to_interface(sig, with_initialize:)
  module_name = sig.name
  namespace = module_name.namespace.append(module_name.name)

  params = sig.params&.variables || []
  supers = []
  methods = {}
  ivar_chains = {}

  if sig.is_a?(AST::Signature::Class)
    unless sig.name == AST::Builtin::BasicObject.module_name
      super_class_name = sig.super_class&.name || AST::Builtin::Object.module_name
      if super_class_name.relative?
        super_class_name = signatures.find_class(super_class_name, current_module: namespace).name
      end
      super_class_interface = build_instance(super_class_name,
                                             with_initialize: with_initialize)

      supers.push(*super_class_interface.supers)
      instantiated = super_class_interface.instantiate(
        type: AST::Types::Self.new,
        args: (sig.super_class&.args || []).map {|type| absolute_type(type, current: namespace) },
        instance_type: AST::Types::Instance.new,
        module_type: AST::Types::Class.new
      )

      methods.merge!(instantiated.methods)
      merge_ivars(ivar_chains, instantiated.ivars)
    end
  end

  if sig.is_a?(AST::Signature::Module)
    if sig.self_type
      supers << absolute_type(sig.self_type, current: namespace)
    end
  end

  sig.members.each do |member|
    case member
    when AST::Signature::Members::Include
      member_name = signatures.find_module(member.name, current_module: namespace).name
      build_instance(member_name, with_initialize: false).yield_self do |module_interface|
        merge_mixin(module_interface,
                    member.args.map {|type| absolute_type(type, current: namespace) },
                    methods: methods,
                    ivars: ivar_chains,
                    supers: supers,
                    current: namespace)
      end
    end
  end

  sig.members.each do |member|
    case member
    when AST::Signature::Members::Method
      if member.instance_method?
        if with_initialize || member.name != :initialize
          extra_attrs = member.name == :initialize ? [:incompatible] : []
          add_method(module_name, member, methods: methods, extra_attributes: extra_attrs, current: namespace)
        end
      end
    when AST::Signature::Members::Ivar
      merge_ivars(ivar_chains,
                  { member.name => absolute_type(member.type, current: namespace) })
    when AST::Signature::Members::Attr
      merge_attribute(sig, ivar_chains, methods, module_name, member, current: namespace)
    end
  end

  signatures.find_extensions(sig.name).each do |ext|
    ext.members.each do |member|
      case member
      when AST::Signature::Members::Method
        if member.instance_method?
          add_method(module_name, member, methods: methods, current: namespace)
        end
      end
    end
  end

  Abstract.new(
    name: module_name,
    params: params,
    methods: methods,
    supers: supers,
    ivar_chains: ivar_chains
  )
end

#interface_to_interface(_, sig) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 528

def interface_to_interface(_, sig)
  type_name = sig.name

  variables = sig.params&.variables || []
  methods = sig.methods.each.with_object({}) do |method, methods|
    methods[method.name] = Method.new(
      type_name: type_name,
      name: method.name,
      types: method.types.map do |method_type|
        method_type_to_method_type(method_type, current: type_name.namespace)
      end,
      super_method: nil,
      attributes: []
    )
  end

  Abstract.new(
    name: type_name,
    params: variables,
    methods: methods,
    supers: [],
    ivar_chains: {}
  )
end

#merge_attribute(sig, ivar_chains, methods, type_name, member, current:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 479

def merge_attribute(sig, ivar_chains, methods, type_name, member, current:)
  if member.ivar != false
    ivar_name = member.ivar || "@#{member.name}".to_sym
    merge_ivars(ivar_chains,
                { ivar_name => absolute_type(member.type, current: current) })
  end

  reader_method = AST::Signature::Members::Method.new(
    location: member.location,
    name: member.name,
    kind: :instance,
    types: [
      AST::MethodType.new(location: member.type.location,
                          type_params: nil,
                          params: nil,
                          block: nil,
                          return_type: member.type)
    ],
    attributes: []
  )
  add_method(type_name, reader_method, methods: methods, current: current)

  if member.accessor?
    writer_method = AST::Signature::Members::Method.new(
      location: member.location,
      name: "#{member.name}=".to_sym,
      kind: :instance,
      types: [
        AST::MethodType.new(location: member.type.location,
                            type_params: nil,
                            params: AST::MethodType::Params::Required.new(
                              location: member.type.location,
                              type: member.type
                            ),
                            block: nil,
                            return_type: member.type)
      ],
      attributes: []
    )
    add_method(type_name, writer_method, methods: methods, current: current)
  end
end

#merge_ivars(dest, new_vars) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 522

def merge_ivars(dest, new_vars)
  new_vars.each do |name, new_type|
    dest[name] = IvarChain.new(type: new_type, parent: dest[name])
  end
end

#merge_mixin(interface, args, methods:, ivars:, supers:, current:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 150

def merge_mixin(interface, args, methods:, ivars:, supers:, current:)
  supers.push(*interface.supers)

  instantiated = interface.instantiate(
    type: AST::Types::Self.new,
    args: args,
    instance_type: AST::Types::Instance.new,
    module_type: AST::Types::Class.new
  )

  methods.merge!(instantiated.methods) do |_, super_method, new_method|
    if super_method.include_in_chain?(new_method)
      super_method
    else
      new_method.with_super(super_method)
    end
  end

  merge_ivars ivars, instantiated.ivars
end

#method_type_to_method_type(method_type, current:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 553

def method_type_to_method_type(method_type, current:)
  type_params = method_type.type_params&.variables || []
  params = params_to_params(method_type.params, current: current)
  block = method_type.block && Block.new(
    type: AST::Types::Proc.new(
      params: params_to_params(method_type.block.params, current: current),
      return_type: absolute_type(method_type.block.return_type, current: current),
      location: method_type.block.location,
      ),
    optional: method_type.block.optional
  )

  MethodType.new(
    type_params: type_params,
    return_type: absolute_type(method_type.return_type, current: current),
    block: block,
    params: params,
    location: method_type.location
  )
end

#module_to_interface(sig) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 313

def module_to_interface(sig)
  module_name = sig.name
  namespace = module_name.namespace.append(module_name.name)

  supers = [sig.self_type].compact.map {|type| absolute_type(type, current: namespace) }
  methods = {}
  ivar_chains = {}

  module_instance = build_instance(AST::Builtin::Module.module_name, with_initialize: false)
  instantiated = module_instance.instantiate(
    type: AST::Types::Self.new,
    args: [],
    instance_type: AST::Types::Instance.new,
    module_type: AST::Types::Class.new
  )
  methods.merge!(instantiated.methods)

  sig.members.each do |member|
    case member
    when AST::Signature::Members::Include
      member_name = signatures.find_module(member.name, current_module: namespace).name
      build_module(member_name).yield_self do |module_interface|
        merge_mixin(module_interface,
                    member.args.map {|type| absolute_type(type, current: namespace) },
                    methods: methods,
                    ivars: ivar_chains,
                    supers: supers,
                    current: namespace)
      end
    when AST::Signature::Members::Extend
      member_name = signatures.find_module(member.name, current_module: namespace).name
      build_instance(member_name, with_initialize: false).yield_self do |module_interface|
        merge_mixin(module_interface,
                    member.args.map {|type| absolute_type(type, current: namespace) },
                    methods: methods,
                    ivars: ivar_chains,
                    supers: supers,
                    current: namespace)

      end
    end
  end

  sig.members.each do |member|
    case member
    when AST::Signature::Members::Method
      if member.module_method?
        add_method(module_name, member, methods: methods, current: namespace)
      end
    when AST::Signature::Members::Ivar
      merge_ivars(ivar_chains,
                  { member.name => absolute_type(member.type, current: namespace) })
    when AST::Signature::Members::Attr
      merge_attribute(sig, ivar_chains, methods, module_name, member)
    end
  end

  signatures.find_extensions(module_name).each do |ext|
    ext.members.each do |member|
      case member
      when AST::Signature::Members::Method
        if member.module_method?
          add_method(module_name, member, methods: methods, current: namespace)
        end
      end
    end
  end

  Abstract.new(
    name: module_name,
    params: [],
    methods: methods,
    supers: supers,
    ivar_chains: ivar_chains
  )
end

#params_to_params(params, current:) ⇒ Object 



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# File 'lib/steep/interface/builder.rb', line 574

def params_to_params(params, current:)
  required = []
  optional = []
  rest = nil
  required_keywords = {}
  optional_keywords = {}
  rest_keywords = nil

  while params
    case params
    when AST::MethodType::Params::Required
      required << absolute_type(params.type, current: current)
    when AST::MethodType::Params::Optional
      optional << absolute_type(params.type, current: current)
    when AST::MethodType::Params::Rest
      rest = absolute_type(params.type, current: current)
    when AST::MethodType::Params::RequiredKeyword
      required_keywords[params.name] = absolute_type(params.type, current: current)
    when AST::MethodType::Params::OptionalKeyword
      optional_keywords[params.name] = absolute_type(params.type, current: current)
    when AST::MethodType::Params::RestKeyword
      rest_keywords = absolute_type(params.type, current: current)
      break
    end
    params = params.next_params
  end

  Params.new(
    required: required,
    optional: optional,
    rest: rest,
    required_keywords: required_keywords,
    optional_keywords: optional_keywords,
    rest_keywords: rest_keywords
  )
end