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method_builder.rb
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method_builder.rb
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module RBS
class DefinitionBuilder
class MethodBuilder
class Methods
Definition = Struct.new(:name, :type, :originals, :overloads, :accessibilities, keyword_init: true) do
def original
originals[0]
end
def accessibility
accessibilities[0]
end
def self.empty(name:, type:)
new(type: type, name: name, originals: [], overloads: [], accessibilities: [])
end
end
attr_reader :type
attr_reader :methods
def initialize(type:)
@type = type
@methods = {}
end
def validate!
methods.each_value do |defn|
if defn.originals.size > 1
raise DuplicatedMethodDefinitionError.new(
type: type,
method_name: defn.name,
members: defn.originals
)
end
end
self
end
def each
if block_given?
Sorter.new(methods).each_strongly_connected_component do |scc|
if scc.size > 1
raise RecursiveAliasDefinitionError.new(type: type, defs: scc)
end
yield scc[0]
end
else
enum_for :each
end
end
class Sorter
include TSort
attr_reader :methods
def initialize(methods)
@methods = methods
end
def tsort_each_node(&block)
methods.each_value(&block)
end
def tsort_each_child(defn)
if (member = defn.original).is_a?(AST::Members::Alias)
if old = methods[member.old_name]
yield old
end
end
end
end
end
attr_reader :env
attr_reader :instance_methods
attr_reader :singleton_methods
attr_reader :interface_methods
def initialize(env:)
@env = env
@instance_methods = {}
@singleton_methods = {}
@interface_methods = {}
end
def build_instance(type_name)
instance_methods[type_name] ||=
begin
entry = env.class_decls[type_name]
args = Types::Variable.build(entry.type_params.each.map(&:name))
type = Types::ClassInstance.new(name: type_name, args: args, location: nil)
Methods.new(type: type).tap do |methods|
entry.decls.each do |d|
subst = Substitution.build(d.decl.type_params.each.map(&:name), args)
each_member_with_accessibility(d.decl.members) do |member, accessibility|
case member
when AST::Members::MethodDefinition
if member.instance?
build_method(methods,
type,
member: member.update(types: member.types.map {|type| type.sub(subst) }),
accessibility: accessibility)
end
when AST::Members::AttrReader, AST::Members::AttrWriter, AST::Members::AttrAccessor
if member.kind == :instance
build_attribute(methods,
type,
member: member.update(type: member.type.sub(subst)),
accessibility: accessibility)
end
when AST::Members::Alias
if member.kind == :instance
build_alias(methods, type, member: member, accessibility: accessibility)
end
end
end
end
end.validate!
end
end
def build_singleton(type_name)
singleton_methods[type_name] ||=
begin
entry = env.class_decls[type_name]
type = Types::ClassSingleton.new(name: type_name, location: nil)
Methods.new(type: type).tap do |methods|
entry.decls.each do |d|
each_member_with_accessibility(d.decl.members) do |member, accessibility|
case member
when AST::Members::MethodDefinition
if member.singleton?
build_method(methods, type, member: member, accessibility: accessibility)
end
when AST::Members::AttrReader, AST::Members::AttrWriter, AST::Members::AttrAccessor
if member.kind == :singleton
build_attribute(methods, type, member: member, accessibility: accessibility)
end
when AST::Members::Alias
if member.kind == :singleton
build_alias(methods, type, member: member, accessibility: accessibility)
end
end
end
end
end.validate!
end
end
def build_interface(type_name)
interface_methods[type_name] ||=
begin
entry = env.interface_decls[type_name]
args = Types::Variable.build(entry.decl.type_params.each.map(&:name))
type = Types::Interface.new(name: type_name, args: args, location: nil)
Methods.new(type: type).tap do |methods|
entry.decl.members.each do |member|
case member
when AST::Members::MethodDefinition
build_method(methods, type, member: member, accessibility: :public)
when AST::Members::Alias
build_alias(methods, type, member: member, accessibility: :public)
end
end
end.validate!
end
end
def build_alias(methods, type, member:, accessibility:)
defn = methods.methods[member.new_name] ||= Methods::Definition.empty(type: type, name: member.new_name)
defn.originals << member
defn.accessibilities << accessibility
end
def build_attribute(methods, type, member:, accessibility:)
if member.is_a?(AST::Members::AttrReader) || member.is_a?(AST::Members::AttrAccessor)
defn = methods.methods[member.name] ||= Methods::Definition.empty(type: type, name: member.name)
defn.accessibilities << accessibility
defn.originals << member
end
if member.is_a?(AST::Members::AttrWriter) || member.is_a?(AST::Members::AttrAccessor)
defn = methods.methods[:"#{member.name}="] ||= Methods::Definition.empty(type: type, name: :"#{member.name}=")
defn.accessibilities << accessibility
defn.originals << member
end
end
def build_method(methods, type, member:, accessibility:)
defn = methods.methods[member.name] ||= Methods::Definition.empty(type: type, name: member.name)
if member.overload?
defn.overloads << member
else
defn.accessibilities << accessibility
defn.originals << member
end
end
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
def update(env:, except:)
MethodBuilder.new(env: env).tap do |copy|
copy.instance_methods.merge!(instance_methods)
copy.singleton_methods.merge!(singleton_methods)
copy.interface_methods.merge!(interface_methods)
except.each do |type_name|
copy.instance_methods.delete(type_name)
copy.singleton_methods.delete(type_name)
copy.interface_methods.delete(type_name)
end
end
end
end
end
end