Class: KatakataIrb::TypeAnalyzer

Inherits:
Object
  • Object
show all
Defined in:
lib/katakata_irb/type_analyzer.rb

Defined Under Namespace

Classes: DigTarget

Constant Summary collapse

OBJECT_METHODS = 
{
  to_s: KatakataIrb::Types::STRING,
  to_str: KatakataIrb::Types::STRING,
  to_a: KatakataIrb::Types::ARRAY,
  to_ary: KatakataIrb::Types::ARRAY,
  to_h: KatakataIrb::Types::HASH,
  to_hash: KatakataIrb::Types::HASH,
  to_i: KatakataIrb::Types::INTEGER,
  to_int: KatakataIrb::Types::INTEGER,
  to_f: KatakataIrb::Types::FLOAT,
  to_c: KatakataIrb::Types::COMPLEX,
  to_r: KatakataIrb::Types::RATIONAL
}

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dig_targets) ⇒ TypeAnalyzer

Returns a new instance of TypeAnalyzer.



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# File 'lib/katakata_irb/type_analyzer.rb', line 37

def initialize(dig_targets)
  @dig_targets = dig_targets
end

Class Method Details

.calculate_target_type_scope(binding, parents, target) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1168

def self.calculate_target_type_scope(binding, parents, target)
  dig_targets = DigTarget.new(parents, target) do |type, scope|
    return type, scope
  end
  program = parents.first
  scope = KatakataIrb::Scope.from_binding(binding, program.locals)
  new(dig_targets).evaluate_program program, scope
  [KatakataIrb::Types::NIL, scope]
end

Instance Method Details

#assign_numbered_parameters(numbered_parameters, scope, args, _kwargs) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 940

def assign_numbered_parameters(numbered_parameters, scope, args, _kwargs)
  return if numbered_parameters.empty?
  max_num = numbered_parameters.map { _1[1].to_i }.max
  if max_num == 1
    scope['_1'] = args.first || KatakataIrb::Types::NIL
  else
    args = sized_splat(args.first, :to_ary, max_num) if args.size == 1
    numbered_parameters.each do |name|
      index = name[1].to_i - 1
      scope[name] = args[index] || KatakataIrb::Types::NIL
    end
  end
end

#assign_parameters(node, scope, args, kwargs) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 889

def assign_parameters(node, scope, args, kwargs)
  args = args.dup
  kwargs = kwargs.dup
  size = node.requireds.size + node.optionals.size + (node.rest ? 1 : 0) + node.posts.size
  args = sized_splat(args.first, :to_ary, size) if size >= 2 && args.size == 1
  reqs = args.shift node.requireds.size
  if node.rest
    # node.rest is Prism::RestParameterNode
    posts = []
    opts = args.shift node.optionals.size
    rest = args
  else
    posts = args.pop node.posts.size
    opts = args
    rest = []
  end
  node.requireds.zip reqs do |n, v|
    assign_required_parameter n, v, scope
  end
  node.optionals.zip opts do |n, v|
    # n is Prism::OptionalParameterNode
    values = [v]
    values << evaluate(n.value, scope) if n.value
    scope[n.name.to_s] = KatakataIrb::Types::UnionType[*values.compact]
  end
  node.posts.zip posts do |n, v|
    assign_required_parameter n, v, scope
  end
  if node.rest&.name
    # node.rest is Prism::RestParameterNode
    scope[node.rest.name.to_s] = KatakataIrb::Types.array_of(*rest)
  end
  node.keywords.each do |n|
    # n is Prism::KeywordParameterNode (prism = 0.16.0)
    # n is Prism::RequiredKeywordParameterNode | Prism::OptionalKeywordParameterNode (prism > 0.16.0)
    name = n.name.to_s.delete(':')
    values = [kwargs.delete(name)]
    # `respond_to?` is for prism > 0.16.0, `&& n.value` is for prism = 0.16.0
    values << evaluate(n.value, scope) if n.respond_to?(:value) && n.value
    scope[name] = KatakataIrb::Types::UnionType[*values.compact]
  end
  # node.keyword_rest is Prism::KeywordRestParameterNode or Prism::ForwardingParameterNode or Prism::NoKeywordsParameterNode
  if node.keyword_rest.is_a?(Prism::KeywordRestParameterNode) && node.keyword_rest.name
    scope[node.keyword_rest.name.to_s] = KatakataIrb::Types::InstanceType.new(Hash, K: KatakataIrb::Types::SYMBOL, V: KatakataIrb::Types::UnionType[*kwargs.values])
  end
  if node.block&.name
    # node.block is Prism::BlockParameterNode
    scope[node.block.name.to_s] = KatakataIrb::Types::PROC
  end
end

#assign_required_parameter(node, value, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 846

def assign_required_parameter(node, value, scope)
  case node.type
  when :required_parameter_node
    scope[node.name.to_s] = value || KatakataIrb::Types::OBJECT
  when :multi_target_node
    parameters = [*node.lefts, *node.rest, *node.rights]
    values = value ? sized_splat(value, :to_ary, parameters.size) : []
    parameters.zip values do |n, v|
      assign_required_parameter n, v, scope
    end
  when :splat_node
    splat_value = value ? KatakataIrb::Types.array_of(value) : KatakataIrb::Types::ARRAY
    assign_required_parameter node.expression, splat_value, scope if node.expression
  end
end

#class_or_value_to_instance(type) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1022

def class_or_value_to_instance(type)
  instance_types = type.types.map do |t|
    t.is_a?(KatakataIrb::Types::SingletonType) ? KatakataIrb::Types::InstanceType.new(t.module_or_class) : t
  end
  KatakataIrb::Types::UnionType[*instance_types]
end

#const_path_write(receiver, name, value, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 837

def const_path_write(receiver, name, value, scope)
  if receiver # receiver::A = value
    singleton_type = receiver.types.find { _1.is_a? KatakataIrb::Types::SingletonType }
    scope.set_const singleton_type.module_or_class, name, value if singleton_type
  else # ::A = value
    scope.set_const Object, name, value
  end
end

#evaluate(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 41

def evaluate(node, scope)
  method = "evaluate_#{node.type}"
  if respond_to? method
    result = send method, node, scope
  else
    KatakataIrb.log_puts
    KatakataIrb.log_puts :NOMATCH
    KatakataIrb.log_puts node.inspect
    result = KatakataIrb::Types::NIL
  end
  @dig_targets.resolve result, scope if @dig_targets.target? node
  result
end

#evaluate_alias_global_variable_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 791

def evaluate_alias_global_variable_node(_node, _scope) = KatakataIrb::Types::NIL

#evaluate_alias_method_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 790

def evaluate_alias_method_node(_node, _scope) = KatakataIrb::Types::NIL

#evaluate_and_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 304

def evaluate_and_node(node, scope) = evaluate_and_or(node, scope, and_op: true)

#evaluate_and_or(node, scope, and_op:) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 306

def evaluate_and_or(node, scope, and_op:)
  left = evaluate node.left, scope
  right = scope.conditional { evaluate node.right, _1 }
  if and_op
    KatakataIrb::Types::UnionType[right, KatakataIrb::Types::NIL, KatakataIrb::Types::FALSE]
  else
    KatakataIrb::Types::UnionType[left, right]
  end
end

#evaluate_array_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 160

def evaluate_array_node(node, scope)
  KatakataIrb::Types.array_of evaluate_list_splat_items(node.elements, scope)
end

#evaluate_back_reference_read_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 221

def evaluate_back_reference_read_node(_node, _scope)
  KatakataIrb::Types::UnionType[KatakataIrb::Types::STRING, KatakataIrb::Types::NIL]
end

#evaluate_begin_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 553

def evaluate_begin_node(node, scope)
  return_type = node.statements ? evaluate(node.statements, scope) : KatakataIrb::Types::NIL
  if node.rescue_clause
    if node.else_clause
      return_types = scope.run_branches(
        ->{ evaluate node.rescue_clause, _1 },
        ->{ evaluate node.else_clause, _1 }
      )
    else
      return_types = [
        return_type,
        scope.conditional { evaluate node.rescue_clause, _1 }
      ]
    end
    return_type = KatakataIrb::Types::UnionType[*return_types]
  end
  if node.ensure_clause&.statements
    # ensure_clause is Prism::EnsureNode
    evaluate node.ensure_clause.statements, scope
  end
  return_type
end

#evaluate_break_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 503

def evaluate_break_node(node, scope) = evaluate_jump(node, scope, :break)

#evaluate_call_and_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 317

def evaluate_call_and_write_node(node, scope) = evaluate_call_write(node, scope, :and, node.write_name)

#evaluate_call_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 235

def evaluate_call_node(node, scope)
  is_field_assign = node.name.match?(/[^<>=!\]]=\z/) || (node.name == :[]= && !node.call_operator)
  receiver_type = node.receiver ? evaluate(node.receiver, scope) : scope.self_type
  evaluate_method = lambda do |scope|
    args_types, kwargs_types, block_sym_node, has_block = evaluate_call_node_arguments node, scope

    if block_sym_node
      block_sym = block_sym_node.value
      if @dig_targets.target? block_sym_node
        # method(args, &:completion_target)
        call_block_proc = ->(block_args, _self_type) do
          block_receiver = block_args.first || KatakataIrb::Types::OBJECT
          @dig_targets.resolve block_receiver, scope
          KatakataIrb::Types::OBJECT
        end
      else
        call_block_proc = ->(block_args, _self_type) do
          block_receiver, *rest = block_args
          block_receiver ? method_call(block_receiver || KatakataIrb::Types::OBJECT, block_sym, rest, nil, nil, scope) : KatakataIrb::Types::OBJECT
        end
      end
    elsif node.block.is_a? Prism::BlockNode
      call_block_proc = ->(block_args, block_self_type) do
        scope.conditional do |s|
          numbered_parameters = node.block.locals.grep(/\A_[1-9]/).map(&:to_s)
          params_table = node.block.locals.to_h { [_1.to_s, KatakataIrb::Types::NIL] }
          table = { **params_table, KatakataIrb::Scope::BREAK_RESULT => nil, KatakataIrb::Scope::NEXT_RESULT => nil }
          block_scope = KatakataIrb::Scope.new s, table, self_type: block_self_type, trace_ivar: !block_self_type
          # TODO kwargs
          if node.block.parameters&.parameters
            # node.block.parameters is Prism::BlockParametersNode
            assign_parameters node.block.parameters.parameters, block_scope, block_args, {}
          elsif !numbered_parameters.empty?
            assign_numbered_parameters numbered_parameters, block_scope, block_args, {}
          end
          result = node.block.body ? evaluate(node.block.body, block_scope) : KatakataIrb::Types::NIL
          block_scope.merge_jumps
          s.update block_scope
          nexts = block_scope[KatakataIrb::Scope::NEXT_RESULT]
          breaks = block_scope[KatakataIrb::Scope::BREAK_RESULT]
          if block_scope.terminated?
            [KatakataIrb::Types::UnionType[*nexts], breaks]
          else
            [KatakataIrb::Types::UnionType[result, *nexts], breaks]
          end
        end
      end
    elsif has_block
      call_block_proc = ->(_block_args, _self_type) { KatakataIrb::Types::OBJECT }
    end
    result = method_call receiver_type, node.name, args_types, kwargs_types, call_block_proc, scope
    if is_field_assign
      args_types.last || KatakataIrb::Types::NIL
    else
      result
    end
  end
  if node.call_operator == '&.'
    result = scope.conditional { evaluate_method.call _1 }
    if receiver_type.nillable?
      KatakataIrb::Types::UnionType[result, KatakataIrb::Types::NIL]
    else
      result
    end
  else
    evaluate_method.call scope
  end
end

#evaluate_call_node_arguments(call_node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 795

def evaluate_call_node_arguments(call_node, scope)
  # call_node.arguments is Prism::ArgumentsNode
  arguments = call_node.arguments&.arguments&.dup || []
  block_arg = call_node.block.expression if call_node.block.is_a?(Prism::BlockArgumentNode)
  kwargs = arguments.pop.elements if arguments.last.is_a?(Prism::KeywordHashNode)
  args_types = arguments.map do |arg|
    case arg
    when Prism::ForwardingArgumentsNode
      # `f(a, ...)` treat like splat
      nil
    when Prism::SplatNode
      evaluate arg.expression, scope if arg.expression
      nil # TODO: splat
    else
      evaluate arg, scope
    end
  end
  if kwargs
    kwargs_types = kwargs.map do |arg|
      case arg
      when Prism::AssocNode
        if arg.key.is_a?(Prism::SymbolNode)
          [arg.key.value, evaluate(arg.value, scope)]
        else
          evaluate arg.key, scope
          evaluate arg.value, scope
          nil
        end
      when Prism::AssocSplatNode
        evaluate arg.value, scope if arg.value
        nil
      end
    end.compact.to_h
  end
  if block_arg.is_a? Prism::SymbolNode
    block_sym_node = block_arg
  elsif block_arg
    evaluate block_arg, scope
  end
  [args_types, kwargs_types, block_sym_node, !!block_arg]
end

#evaluate_call_operator_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 316

def evaluate_call_operator_write_node(node, scope) = evaluate_call_write(node, scope, :operator, node.write_name)

#evaluate_call_or_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 318

def evaluate_call_or_write_node(node, scope) = evaluate_call_write(node, scope, :or, node.write_name)

#evaluate_call_write(node, scope, operator, write_name) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 322

def evaluate_call_write(node, scope, operator, write_name)
  receiver_type = evaluate node.receiver, scope
  if write_name == :[]=
    args_types, kwargs_types, block_sym_node, has_block = evaluate_call_node_arguments node, scope
  else
    args_types = []
  end
  if block_sym_node
    block_sym = block_sym_node.value
    call_block_proc = ->(block_args, _self_type) do
      block_receiver, *rest = block_args
      block_receiver ? method_call(block_receiver || KatakataIrb::Types::OBJECT, block_sym, rest, nil, nil, scope) : KatakataIrb::Types::OBJECT
    end
  elsif has_block
    call_block_proc = ->(_block_args, _self_type) { KatakataIrb::Types::OBJECT }
  end
  method = write_name.to_s.delete_suffix('=')
  left = method_call receiver_type, method, args_types, kwargs_types, call_block_proc, scope
  case operator
  when :and
    right = scope.conditional { evaluate node.value, _1 }
    KatakataIrb::Types::UnionType[right, KatakataIrb::Types::NIL, KatakataIrb::Types::FALSE]
  when :or
    right = scope.conditional { evaluate node.value, _1 }
    KatakataIrb::Types::UnionType[left, right]
  else
    right = evaluate node.value, scope
    method_call left, node.operator, [right], nil, nil, scope, name_match: false
  end
end

#evaluate_case_match(target, node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 954

def evaluate_case_match(target, node, scope)
  case node
  when Prism::WhenNode
    node.conditions.each { evaluate _1, scope }
    node.statements ? evaluate(node.statements, scope) : KatakataIrb::Types::NIL
  when Prism::InNode
    pattern = node.pattern
    if pattern.is_a?(Prism::IfNode) || pattern.is_a?(Prism::UnlessNode)
      cond_node = pattern.predicate
      pattern = pattern.statements.body.first
    end
    evaluate_match_pattern(target, pattern, scope)
    evaluate cond_node, scope if cond_node # TODO: conditional branch
    node.statements ? evaluate(node.statements, scope) : KatakataIrb::Types::NIL
  end
end

#evaluate_case_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 706

def evaluate_case_node(node, scope)
  target = evaluate(node.predicate, scope) if node.predicate
  # TODO
  branches = node.conditions.map do |condition|
    ->(s) { evaluate_case_match target, condition, s }
  end
  if node.consequent
    branches << ->(s) { evaluate node.consequent, s }
  elsif node.conditions.any? { _1.is_a? Prism::WhenNode }
    branches << ->(_s) { KatakataIrb::Types::NIL }
  end
  KatakataIrb::Types::UnionType[*scope.run_branches(*branches)]
end

#evaluate_class_module(node, scope, is_class) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 631

def evaluate_class_module(node, scope, is_class)
  unless node.constant_path.is_a?(Prism::ConstantReadNode) || node.constant_path.is_a?(Prism::ConstantPathNode)
    # Incomplete class/module `class (statement[cursor_here])::Name; end`
    evaluate node.constant_path, scope
    return KatakataIrb::Types::NIL
  end
  const_type, _receiver, parent_module, name = evaluate_constant_node_info node.constant_path, scope
  if is_class
    select_class_type = -> { _1.is_a?(KatakataIrb::Types::SingletonType) && _1.module_or_class.is_a?(Class) }
    module_types = const_type.types.select(&select_class_type)
    module_types += evaluate(node.superclass, scope).types.select(&select_class_type) if node.superclass
    module_types << KatakataIrb::Types::CLASS if module_types.empty?
  else
    module_types = const_type.types.select { _1.is_a?(KatakataIrb::Types::SingletonType) && !_1.module_or_class.is_a?(Class) }
    module_types << KatakataIrb::Types::MODULE if module_types.empty?
  end
  return KatakataIrb::Types::NIL unless node.body

  table = node.locals.to_h { [_1.to_s, KatakataIrb::Types::NIL] }
  if !name.empty? && (parent_module.is_a?(Module) || parent_module.nil?)
    value = parent_module.const_get name if parent_module&.const_defined? name
    unless value
      value_type = scope[name]
      value = value_type.module_or_class if value_type.is_a? KatakataIrb::Types::SingletonType
    end

    if value.is_a? Module
      nesting = [value, []]
    else
      if parent_module
        nesting = [parent_module, [name]]
      else
        parent_nesting, parent_path = scope.module_nesting.first
        nesting = [parent_nesting, parent_path + [name]]
      end
      nesting_key = [nesting[0].__id__, nesting[1]].join('::')
      nesting_value = is_class ? KatakataIrb::Types::CLASS : KatakataIrb::Types::MODULE
    end
  else
    # parent_module == :unknown
    # TODO: dummy module
  end
  module_scope = KatakataIrb::Scope.new(
    scope,
    { **table, KatakataIrb::Scope::BREAK_RESULT => nil, KatakataIrb::Scope::NEXT_RESULT => nil, KatakataIrb::Scope::RETURN_RESULT => nil },
    trace_ivar: false,
    trace_lvar: false,
    self_type: KatakataIrb::Types::UnionType[*module_types],
    nesting: nesting
  )
  module_scope[nesting_key] = nesting_value if nesting_value
  result = evaluate(node.body, module_scope)
  scope.update module_scope
  result
end

#evaluate_class_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 629

def evaluate_class_node(node, scope) = evaluate_class_module(node, scope, true)

#evaluate_constant_and_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 388

def evaluate_constant_and_write_node(node, scope)
  right = scope.conditional { evaluate node.value, scope }
  scope[node.name.to_s] = KatakataIrb::Types::UnionType[right, KatakataIrb::Types::NIL, KatakataIrb::Types::FALSE]
end

#evaluate_constant_node_info(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 862

def evaluate_constant_node_info(node, scope)
  case node
  when Prism::ConstantPathNode
    name = node.child.name.to_s
    if node.parent
      receiver = evaluate node.parent, scope
      if receiver.is_a? KatakataIrb::Types::SingletonType
        parent_module = receiver.module_or_class
      end
    else
      parent_module = Object
    end
    if parent_module
      type = scope.get_const(parent_module, [name]) || KatakataIrb::Types::NIL
    else
      parent_module = :unknown
      type = KatakataIrb::Types::NIL
    end
  when Prism::ConstantReadNode
    name = node.name.to_s
    type = scope[name]
  end
  @dig_targets.resolve type, scope if @dig_targets.target? node
  [type, receiver, parent_module, name]
end

#evaluate_constant_operator_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 382

def evaluate_constant_operator_write_node(node, scope)
  left = scope[node.name.to_s] || KatakataIrb::Types::OBJECT
  right = evaluate node.value, scope
  scope[node.name.to_s] = method_call left, node.operator, [right], nil, nil, scope, name_match: false
end

#evaluate_constant_or_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 393

def evaluate_constant_or_write_node(node, scope)
  left = scope[node.name.to_s] || KatakataIrb::Types::OBJECT
  right = scope.conditional { evaluate node.value, scope }
  scope[node.name.to_s] = KatakataIrb::Types::UnionType[left, right]
end

#evaluate_constant_path_and_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 407

def evaluate_constant_path_and_write_node(node, scope)
  _left, receiver, _parent_module, name = evaluate_constant_node_info node.target, scope
  right = scope.conditional { evaluate node.value, scope }
  value = KatakataIrb::Types::UnionType[right, KatakataIrb::Types::NIL, KatakataIrb::Types::FALSE]
  const_path_write receiver, name, value, scope
  value
end

#evaluate_constant_path_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 198

def evaluate_constant_path_node(node, scope)
  type, = evaluate_constant_node_info node, scope
  type
end

#evaluate_constant_path_operator_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 399

def evaluate_constant_path_operator_write_node(node, scope)
  left, receiver, _parent_module, name = evaluate_constant_node_info node.target, scope
  right = evaluate node.value, scope
  value = method_call left, node.operator, [right], nil, nil, scope, name_match: false
  const_path_write receiver, name, value, scope
  value
end

#evaluate_constant_path_or_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 415

def evaluate_constant_path_or_write_node(node, scope)
  left, receiver, _parent_module, name = evaluate_constant_node_info node.target, scope
  right = scope.conditional { evaluate node.value, scope }
  value = KatakataIrb::Types::UnionType[left, right]
  const_path_write receiver, name, value, scope
  value
end

#evaluate_constant_path_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 423

def evaluate_constant_path_write_node(node, scope)
  receiver = evaluate node.target.parent, scope if node.target.parent
  value = evaluate node.value, scope
  const_path_write receiver, node.target.child.name.to_s, value, scope
  value
end

#evaluate_def_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 67

def evaluate_def_node(node, scope)
  if node.receiver
    self_type = evaluate node.receiver, scope
  else
    current_self_types = scope.self_type.types
    self_types = current_self_types.map do |type|
      if type.is_a?(KatakataIrb::Types::SingletonType) && type.module_or_class.is_a?(Class)
        KatakataIrb::Types::InstanceType.new type.module_or_class
      else
        type
      end
    end
    self_type = KatakataIrb::Types::UnionType[*self_types]
  end
  if @dig_targets.dig?(node.body) || @dig_targets.dig?(node.parameters)
    params_table = node.locals.to_h { [_1.to_s, KatakataIrb::Types::NIL] }
    method_scope = KatakataIrb::Scope.new(
      scope,
      { **params_table, KatakataIrb::Scope::BREAK_RESULT => nil, KatakataIrb::Scope::NEXT_RESULT => nil, KatakataIrb::Scope::RETURN_RESULT => nil },
      self_type: self_type,
      trace_lvar: false,
      trace_ivar: false
    )
    if node.parameters
      # node.parameters is Prism::ParametersNode
      assign_parameters node.parameters, method_scope, [], {}
    end

    if @dig_targets.dig?(node.body)
      method_scope.conditional do |s|
        evaluate node.body, s
      end
    end
    method_scope.merge_jumps
    scope.update method_scope
  end
  KatakataIrb::Types::SYMBOL
end

#evaluate_defined_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 739

def evaluate_defined_node(node, scope)
  scope.conditional { evaluate node.value, _1 }
  KatakataIrb::Types::UnionType[KatakataIrb::Types::STRING, KatakataIrb::Types::NIL]
end

#evaluate_else_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 483

def evaluate_else_node(node, scope)
  node.statements ? evaluate(node.statements, scope) : KatakataIrb::Types::NIL
end

#evaluate_embedded_statements_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 150

def evaluate_embedded_statements_node(node, scope)
  node.statements ? evaluate(node.statements, scope) : KatakataIrb::Types::NIL
  KatakataIrb::Types::STRING
end

#evaluate_embedded_variable_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 155

def evaluate_embedded_variable_node(node, scope)
  evaluate node.variable, scope
  KatakataIrb::Types::STRING
end

#evaluate_false_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 207

def evaluate_false_node(_node, _scope) = KatakataIrb::Types::FALSE

#evaluate_flip_flop_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 744

def evaluate_flip_flop_node(node, scope)
  scope.conditional { evaluate node.left, _1 } if node.left
  scope.conditional { evaluate node.right, _1 } if node.right
  KatakataIrb::Types::BOOLEAN
end

#evaluate_float_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 108

def evaluate_float_node(_node, _scope) = KatakataIrb::Types::FLOAT

#evaluate_for_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 687

def evaluate_for_node(node, scope)
  node.statements
  collection = evaluate node.collection, scope
  inner_scope = KatakataIrb::Scope.new scope, { KatakataIrb::Scope::BREAK_RESULT => nil }
  ary_type = method_call collection, :to_ary, [], nil, nil, nil, name_match: false
  element_types = ary_type.types.filter_map do |ary|
    ary.params[:Elem] if ary.is_a?(KatakataIrb::Types::InstanceType) && ary.klass == Array
  end
  element_type = KatakataIrb::Types::UnionType[*element_types]
  inner_scope.conditional do |s|
    evaluate_write node.index, element_type, s, nil
    evaluate node.statements, s if node.statements
  end
  inner_scope.merge_jumps
  scope.update inner_scope
  breaks = inner_scope[KatakataIrb::Scope::BREAK_RESULT]
  breaks ? KatakataIrb::Types::UnionType[breaks, collection] : collection
end

#evaluate_forwarding_super_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 546

def evaluate_forwarding_super_node(_node, _scope) = KatakataIrb::Types::OBJECT

#evaluate_hash(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 166

def evaluate_hash(node, scope)
  keys = []
  values = []
  node.elements.each do |assoc|
    case assoc
    when Prism::AssocNode
      keys << evaluate(assoc.key, scope)
      values << evaluate(assoc.value, scope)
    when Prism::AssocSplatNode
      next unless assoc.value # def f(**); {**}

      hash = evaluate assoc.value, scope
      unless hash.is_a?(KatakataIrb::Types::InstanceType) && hash.klass == Hash
        hash = method_call hash, :to_hash, [], nil, nil, scope
      end
      if hash.is_a?(KatakataIrb::Types::InstanceType) && hash.klass == Hash
        keys << hash.params[:K] if hash.params[:K]
        values << hash.params[:V] if hash.params[:V]
      end
    end
  end
  if keys.empty? && values.empty?
    KatakataIrb::Types::InstanceType.new Hash
  else
    KatakataIrb::Types::InstanceType.new Hash, K: KatakataIrb::Types::UnionType[*keys], V: KatakataIrb::Types::UnionType[*values]
  end
end

#evaluate_hash_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 164

def evaluate_hash_node(node, scope) = evaluate_hash(node, scope)

#evaluate_if_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 473

def evaluate_if_node(node, scope) = evaluate_if_unless(node, scope)

#evaluate_if_unless(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 475

def evaluate_if_unless(node, scope)
  evaluate node.predicate, scope
  KatakataIrb::Types::UnionType[*scope.run_branches(
    -> { node.statements ? evaluate(node.statements, _1) : KatakataIrb::Types::NIL },
    -> { node.consequent ? evaluate(node.consequent, _1) : KatakataIrb::Types::NIL }
  )]
end

#evaluate_imaginary_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 112

def evaluate_imaginary_node(_node, _scope) = KatakataIrb::Types::COMPLEX

#evaluate_implicit_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 762

def evaluate_implicit_node(node, scope)
  evaluate node.value, scope
end

#evaluate_index_and_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 320

def evaluate_index_and_write_node(node, scope) = evaluate_call_write(node, scope, :and, :[]=)

#evaluate_index_operator_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 319

def evaluate_index_operator_write_node(node, scope) = evaluate_call_write(node, scope, :operator, :[]=)

#evaluate_index_or_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 321

def evaluate_index_or_write_node(node, scope) = evaluate_call_write(node, scope, :or, :[]=)

#evaluate_integer_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 106

def evaluate_integer_node(_node, _scope) = KatakataIrb::Types::INTEGER

#evaluate_interpolated_match_last_line_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 777

def evaluate_interpolated_match_last_line_node(node, scope)
  node.parts.each { evaluate _1, scope }
  KatakataIrb::Types::BOOLEAN
end

#evaluate_interpolated_regular_expression_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 145

def evaluate_interpolated_regular_expression_node(node, scope)
  node.parts.each { evaluate _1, scope }
  KatakataIrb::Types::REGEXP
end

#evaluate_interpolated_string_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 130

def evaluate_interpolated_string_node(node, scope)
  node.parts.each { evaluate _1, scope }
  KatakataIrb::Types::STRING
end

#evaluate_interpolated_symbol_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 140

def evaluate_interpolated_symbol_node(node, scope)
  node.parts.each { evaluate _1, scope }
  KatakataIrb::Types::SYMBOL
end

#evaluate_interpolated_x_string_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 135

def evaluate_interpolated_x_string_node(node, scope)
  node.parts.each { evaluate _1, scope }
  KatakataIrb::Types::STRING
end

#evaluate_jump(node, scope, mode) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 506

def evaluate_jump(node, scope, mode)
  internal_key = (
    case mode
    when :break
      KatakataIrb::Scope::BREAK_RESULT
    when :next
      KatakataIrb::Scope::NEXT_RESULT
    when :return
      KatakataIrb::Scope::RETURN_RESULT
    end
  )
  jump_value = (
    arguments = node.arguments&.arguments
    if arguments.nil? || arguments.empty?
      KatakataIrb::Types::NIL
    elsif arguments.size == 1 && !arguments.first.is_a?(Prism::SplatNode)
      evaluate arguments.first, scope
    else
      KatakataIrb::Types.array_of evaluate_list_splat_items(arguments, scope)
    end
  )
  scope.terminate_with internal_key, jump_value
  KatakataIrb::Types::NIL
end

#evaluate_keyword_hash_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 165

def evaluate_keyword_hash_node(node, scope) = evaluate_hash(node, scope)

#evaluate_lambda_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 430

def evaluate_lambda_node(node, scope)
  local_table = node.locals.to_h { [_1.to_s, KatakataIrb::Types::OBJECT] }
  block_scope = KatakataIrb::Scope.new scope, { **local_table, KatakataIrb::Scope::BREAK_RESULT => nil, KatakataIrb::Scope::NEXT_RESULT => nil, KatakataIrb::Scope::RETURN_RESULT => nil }
  block_scope.conditional do |s|
    assign_parameters node.parameters.parameters, s, [], {} if node.parameters&.parameters
    evaluate node.body, s if node.body
  end
  block_scope.merge_jumps
  scope.update block_scope
  KatakataIrb::Types::PROC
end

#evaluate_list_splat_items(list, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1084

def evaluate_list_splat_items(list, scope)
  items = list.flat_map do |node|
    if node.is_a? Prism::SplatNode
      next unless node.expression # def f(*); [*]

      splat = evaluate node.expression, scope
      array_elem, non_array = partition_to_array splat.nonnillable, :to_a
      [*array_elem, *non_array]
    else
      evaluate node, scope
    end
  end.compact.uniq
  KatakataIrb::Types::UnionType[*items]
end

#evaluate_match_last_line_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 773

def evaluate_match_last_line_node(_node, _scope)
  KatakataIrb::Types::BOOLEAN
end

#evaluate_match_pattern(value, pattern, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 971

def evaluate_match_pattern(value, pattern, scope)
  # TODO: scope.terminate_with KatakataIrb::Scope::PATTERNMATCH_BREAK, KatakataIrb::Types::NIL
  case pattern
  when Prism::FindPatternNode
    # TODO
    evaluate_match_pattern KatakataIrb::Types::OBJECT, pattern.left, scope
    pattern.requireds.each { evaluate_match_pattern KatakataIrb::Types::OBJECT, _1, scope }
    evaluate_match_pattern KatakataIrb::Types::OBJECT, pattern.right, scope
  when Prism::ArrayPatternNode
    # TODO
    pattern.requireds.each { evaluate_match_pattern KatakataIrb::Types::OBJECT, _1, scope }
    evaluate_match_pattern KatakataIrb::Types::OBJECT, pattern.rest, scope if pattern.rest
    pattern.posts.each { evaluate_match_pattern KatakataIrb::Types::OBJECT, _1, scope }
    KatakataIrb::Types::ARRAY
  when Prism::HashPatternNode
    # TODO
    pattern.elements.each { evaluate_match_pattern KatakataIrb::Types::OBJECT, _1, scope }
    if pattern.respond_to?(:rest) && pattern.rest
      evaluate_match_pattern KatakataIrb::Types::OBJECT, pattern.rest, scope
    end
    KatakataIrb::Types::HASH
  when Prism::AssocNode
    evaluate_match_pattern value, pattern.value, scope if pattern.value
    KatakataIrb::Types::OBJECT
  when Prism::AssocSplatNode
    # TODO
    evaluate_match_pattern KatakataIrb::Types::HASH, pattern.value, scope
    KatakataIrb::Types::OBJECT
  when Prism::PinnedVariableNode
    evaluate pattern.variable, scope
  when Prism::PinnedExpressionNode
    evaluate pattern.expression, scope
  when Prism::LocalVariableTargetNode
    scope[pattern.name.to_s] = value
  when Prism::AlternationPatternNode
    KatakataIrb::Types::UnionType[evaluate_match_pattern(value, pattern.left, scope), evaluate_match_pattern(value, pattern.right, scope)]
  when Prism::CapturePatternNode
    capture_type = class_or_value_to_instance evaluate_match_pattern(value, pattern.value, scope)
    value = capture_type unless capture_type.types.empty? || capture_type.types == [KatakataIrb::Types::OBJECT]
    evaluate_match_pattern value, pattern.target, scope
  when Prism::SplatNode
    value = KatakataIrb::Types.array_of value
    evaluate_match_pattern value, pattern.expression, scope if pattern.expression
    value
  else
    # literal node
    type = evaluate(pattern, scope)
    class_or_value_to_instance(type)
  end
end

#evaluate_match_predicate_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 726

def evaluate_match_predicate_node(node, scope)
  value_type = evaluate node.value, scope
  scope.conditional { evaluate_match_pattern value_type, node.pattern, _1 }
  KatakataIrb::Types::BOOLEAN
end

#evaluate_match_required_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 720

def evaluate_match_required_node(node, scope)
  value_type = evaluate node.value, scope
  evaluate_match_pattern value_type, node.pattern, scope
  KatakataIrb::Types::NIL # void value
end

#evaluate_match_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 766

def evaluate_match_write_node(node, scope)
  # /(?<a>)(?<b>)/ =~ string
  evaluate node.call, scope
  node.locals.each { scope[_1.to_s] = KatakataIrb::Types::UnionType[KatakataIrb::Types::STRING, KatakataIrb::Types::NIL] }
  KatakataIrb::Types::BOOLEAN
end

#evaluate_missing_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 793

def evaluate_missing_node(_node, _scope) = KatakataIrb::Types::NIL

#evaluate_module_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 630

def evaluate_module_node(node, scope) = evaluate_class_module(node, scope, false)

#evaluate_multi_target_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 750

def evaluate_multi_target_node(node, scope)
  # Raw MultiTargetNode, incomplete code like `a,b`, `*a`.
  evaluate_multi_write_receiver node, scope, nil
  KatakataIrb::Types::NIL
end

#evaluate_multi_write(node, values, scope, evaluated_receivers) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1046

def evaluate_multi_write(node, values, scope, evaluated_receivers)
  pre_targets = node.lefts
  splat_target = node.rest
  post_targets = node.rights
  size = pre_targets.size + (splat_target ? 1 : 0) + post_targets.size
  values = values.is_a?(Array) ? values.dup : sized_splat(values, :to_ary, size)
  pre_pairs = pre_targets.zip(values.shift(pre_targets.size))
  post_pairs = post_targets.zip(values.pop(post_targets.size))
  splat_pairs = splat_target ? [[splat_target, KatakataIrb::Types::UnionType[*values]]] : []
  (pre_pairs + splat_pairs + post_pairs).each do |target, value|
    evaluate_write target, value || KatakataIrb::Types::NIL, scope, evaluated_receivers
  end
end

#evaluate_multi_write_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 451

def evaluate_multi_write_node(node, scope)
  evaluated_receivers = {}
  evaluate_multi_write_receiver node, scope, evaluated_receivers
  value = (
    if node.value.is_a? Prism::ArrayNode
      if node.value.elements.any?(Prism::SplatNode)
        evaluate node.value, scope
      else
        node.value.elements.map do |n|
          evaluate n, scope
        end
      end
    elsif node.value
      evaluate node.value, scope
    else
      KatakataIrb::Types::NIL
    end
  )
  evaluate_multi_write node, value, scope, evaluated_receivers
  value.is_a?(Array) ? KatakataIrb::Types.array_of(*value) : value
end

#evaluate_multi_write_receiver(node, scope, evaluated_receivers) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1060

def evaluate_multi_write_receiver(node, scope, evaluated_receivers)
  case node
  when Prism::MultiWriteNode, Prism::MultiTargetNode
    targets = [*node.lefts, *node.rest, *node.rights]
    targets.each { evaluate_multi_write_receiver _1, scope, evaluated_receivers }
  when Prism::CallNode
    if node.receiver
      receiver = evaluate(node.receiver, scope)
      evaluated_receivers[node.receiver] = receiver if evaluated_receivers
    end
    if node.arguments
      node.arguments.arguments&.each do |arg|
        if arg.is_a? Prism::SplatNode
          evaluate arg.expression, scope
        else
          evaluate arg, scope
        end
      end
    end
  when Prism::SplatNode
    evaluate_multi_write_receiver node.expression, scope, evaluated_receivers if node.expression
  end
end

#evaluate_next_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 504

def evaluate_next_node(node, scope) = evaluate_jump(node, scope, :next)

#evaluate_nil_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 209

def evaluate_nil_node(_node, _scope) = KatakataIrb::Types::NIL

#evaluate_numbered_reference_read_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 217

def evaluate_numbered_reference_read_node(_node, _scope)
  KatakataIrb::Types::UnionType[KatakataIrb::Types::STRING, KatakataIrb::Types::NIL]
end

#evaluate_or_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 305

def evaluate_or_node(node, scope) = evaluate_and_or(node, scope, and_op: false)

#evaluate_parentheses_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 194

def evaluate_parentheses_node(node, scope)
  node.body ? evaluate(node.body, scope) : KatakataIrb::Types::NIL
end

#evaluate_post_execution_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 786

def evaluate_post_execution_node(node, scope)
  node.statements && @dig_targets.dig?(node.statements) ? evaluate(node.statements, scope) : KatakataIrb::Types::NIL
end

#evaluate_pre_execution_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 782

def evaluate_pre_execution_node(node, scope)
  node.statements ? evaluate(node.statements, scope) : KatakataIrb::Types::NIL
end

#evaluate_program(program, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1161

def evaluate_program(program, scope)
  # statements.body[0] is local variable assign code
  program.statements.body[1..].each do |statement|
    evaluate statement, scope
  end
end

#evaluate_program_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 55

def evaluate_program_node(node, scope)
  evaluate node.statements, scope
end

#evaluate_range_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 732

def evaluate_range_node(node, scope)
  beg_type = evaluate node.left, scope if node.left
  end_type = evaluate node.right, scope if node.right
  elem = (KatakataIrb::Types::UnionType[*[beg_type, end_type].compact]).nonnillable
  KatakataIrb::Types::InstanceType.new Range, Elem: elem
end

#evaluate_rational_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 110

def evaluate_rational_node(_node, _scope) = KatakataIrb::Types::RATIONAL

#evaluate_redo_node(_node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 536

def evaluate_redo_node(_node, scope)
  scope.terminate
  KatakataIrb::Types::NIL
end

#evaluate_reference_read(node, scope) ⇒ Object Also known as: evaluate_constant_read_node, evaluate_global_variable_read_node, evaluate_local_variable_read_node, evaluate_class_variable_read_node, evaluate_instance_variable_read_node 



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# File 'lib/katakata_irb/type_analyzer.rb', line 225

def evaluate_reference_read(node, scope)
  scope[node.name.to_s] || KatakataIrb::Types::NIL
end

#evaluate_reference_write(node, scope) ⇒ Object Also known as: evaluate_constant_write_node, evaluate_global_variable_write_node, evaluate_local_variable_write_node, evaluate_class_variable_write_node, evaluate_instance_variable_write_node 



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# File 'lib/katakata_irb/type_analyzer.rb', line 442

def evaluate_reference_write(node, scope)
  scope[node.name.to_s] = evaluate node.value, scope
end

#evaluate_regular_expression_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 122

def evaluate_regular_expression_node(_node, _scope) = KatakataIrb::Types::REGEXP

#evaluate_rescue_modifier_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 605

def evaluate_rescue_modifier_node(node, scope)
  a = evaluate node.expression, scope
  b = scope.conditional { evaluate node.rescue_expression, _1 }
  KatakataIrb::Types::UnionType[a, b]
end

#evaluate_rescue_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 576

def evaluate_rescue_node(node, scope)
  run_rescue = lambda do |s|
    if node.reference
      error_classes_type = evaluate_list_splat_items node.exceptions, s
      error_types = error_classes_type.types.filter_map do
        KatakataIrb::Types::InstanceType.new _1.module_or_class if _1.is_a?(KatakataIrb::Types::SingletonType)
      end
      error_types << KatakataIrb::Types::InstanceType.new(StandardError) if error_types.empty?
      error_type = KatakataIrb::Types::UnionType[*error_types]
      case node.reference
      when Prism::LocalVariableTargetNode, Prism::InstanceVariableTargetNode, Prism::ClassVariableTargetNode, Prism::GlobalVariableTargetNode, Prism::ConstantTargetNode
        s[node.reference.name.to_s] = error_type
      when Prism::CallNode
        evaluate node.reference, s
      end
    end
    node.statements ? evaluate(node.statements, s) : KatakataIrb::Types::NIL
  end
  if node.consequent # begin; rescue A; rescue B; end
    types = scope.run_branches(
      run_rescue,
      -> { evaluate node.consequent, _1 }
    )
    KatakataIrb::Types::UnionType[*types]
  else
    run_rescue.call scope
  end
end

#evaluate_retry_node(_node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 541

def evaluate_retry_node(_node, scope)
  scope.terminate
  KatakataIrb::Types::NIL
end

#evaluate_return_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 505

def evaluate_return_node(node, scope) = evaluate_jump(node, scope, :return)

#evaluate_self_node(_node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 203

def evaluate_self_node(_node, scope) = scope.self_type

#evaluate_singleton_class_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 611

def evaluate_singleton_class_node(node, scope)
  klass_types = evaluate(node.expression, scope).types.filter_map do |type|
    KatakataIrb::Types::SingletonType.new type.klass if type.is_a? KatakataIrb::Types::InstanceType
  end
  klass_types = [KatakataIrb::Types::CLASS] if klass_types.empty?
  table = node.locals.to_h { [_1.to_s, KatakataIrb::Types::NIL] }
  sclass_scope = KatakataIrb::Scope.new(
    scope,
    { **table, KatakataIrb::Scope::BREAK_RESULT => nil, KatakataIrb::Scope::NEXT_RESULT => nil, KatakataIrb::Scope::RETURN_RESULT => nil },
    trace_ivar: false,
    trace_lvar: false,
    self_type: KatakataIrb::Types::UnionType[*klass_types]
  )
  result = node.body ? evaluate(node.body, sclass_scope) : KatakataIrb::Types::NIL
  scope.update sclass_scope
  result
end

#evaluate_source_encoding_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 215

def evaluate_source_encoding_node(_node, _scope) = KatakataIrb::Types::InstanceType.new(Encoding)

#evaluate_source_file_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 211

def evaluate_source_file_node(_node, _scope) = KatakataIrb::Types::STRING

#evaluate_source_line_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 213

def evaluate_source_line_node(_node, _scope) = KatakataIrb::Types::INTEGER

#evaluate_splat_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 756

def evaluate_splat_node(node, scope)
  # Raw SplatNode, incomplete code like `*a.`
  evaluate_multi_write_receiver node.expression, scope, nil if node.expression
  KatakataIrb::Types::NIL
end

#evaluate_statements_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 59

def evaluate_statements_node(node, scope)
  if node.body.empty?
    KatakataIrb::Types::NIL
  else
    node.body.map { evaluate _1, scope }.last
  end
end

#evaluate_string_concat_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 124

def evaluate_string_concat_node(node, scope)
  evaluate node.left, scope
  evaluate node.right, scope
  KatakataIrb::Types::STRING
end

#evaluate_string_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 114

def evaluate_string_node(_node, _scope) = KatakataIrb::Types::STRING

#evaluate_super_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 548

def evaluate_super_node(node, scope)
  evaluate_list_splat_items node.arguments.arguments, scope if node.arguments
  KatakataIrb::Types::OBJECT
end

#evaluate_symbol_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 120

def evaluate_symbol_node(_node, _scope) = KatakataIrb::Types::SYMBOL

#evaluate_true_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 205

def evaluate_true_node(_node, _scope) = KatakataIrb::Types::TRUE

#evaluate_undef_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 792

def evaluate_undef_node(_node, _scope) = KatakataIrb::Types::NIL

#evaluate_unless_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 474

def evaluate_unless_node(node, scope) = evaluate_if_unless(node, scope)

#evaluate_variable_and_write(node, scope) ⇒ Object Also known as: evaluate_global_variable_and_write_node, evaluate_local_variable_and_write_node, evaluate_class_variable_and_write_node, evaluate_instance_variable_and_write_node 



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# File 'lib/katakata_irb/type_analyzer.rb', line 363

def evaluate_variable_and_write(node, scope)
  right = scope.conditional { evaluate node.value, scope }
  scope[node.name.to_s] = KatakataIrb::Types::UnionType[right, KatakataIrb::Types::NIL, KatakataIrb::Types::FALSE]
end

#evaluate_variable_operator_write(node, scope) ⇒ Object Also known as: evaluate_global_variable_operator_write_node, evaluate_local_variable_operator_write_node, evaluate_class_variable_operator_write_node, evaluate_instance_variable_operator_write_node 



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# File 'lib/katakata_irb/type_analyzer.rb', line 353

def evaluate_variable_operator_write(node, scope)
  left = scope[node.name.to_s] || KatakataIrb::Types::OBJECT
  right = evaluate node.value, scope
  scope[node.name.to_s] = method_call left, node.operator, [right], nil, nil, scope, name_match: false
end

#evaluate_variable_or_write(node, scope) ⇒ Object Also known as: evaluate_global_variable_or_write_node, evaluate_local_variable_or_write_node, evaluate_class_variable_or_write_node, evaluate_instance_variable_or_write_node 



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# File 'lib/katakata_irb/type_analyzer.rb', line 372

def evaluate_variable_or_write(node, scope)
  left = scope[node.name.to_s] || KatakataIrb::Types::OBJECT
  right = scope.conditional { evaluate node.value, scope }
  scope[node.name.to_s] = KatakataIrb::Types::UnionType[left, right]
end

#evaluate_while_until(node, scope) ⇒ Object Also known as: evaluate_while_node, evaluate_until_node 



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# File 'lib/katakata_irb/type_analyzer.rb', line 487

def evaluate_while_until(node, scope)
  inner_scope = KatakataIrb::Scope.new scope, { KatakataIrb::Scope::BREAK_RESULT => nil }
  evaluate node.predicate, inner_scope
  if node.statements
    inner_scope.conditional do |s|
      evaluate node.statements, s
    end
  end
  inner_scope.merge_jumps
  scope.update inner_scope
  breaks = inner_scope[KatakataIrb::Scope::BREAK_RESULT]
  breaks ? KatakataIrb::Types::UnionType[breaks, KatakataIrb::Types::NIL] : KatakataIrb::Types::NIL
end

#evaluate_write(node, value, scope, evaluated_receivers) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1029

def evaluate_write(node, value, scope, evaluated_receivers)
  case node
  when Prism::MultiTargetNode
    evaluate_multi_write node, value, scope, evaluated_receivers
  when Prism::CallNode
    evaluated_receivers&.[](node.receiver) || evaluate(node.receiver, scope) if node.receiver
  when Prism::SplatNode
    evaluate_write node.expression, KatakataIrb::Types.array_of(value), scope, evaluated_receivers if node.expression
  when Prism::LocalVariableTargetNode, Prism::GlobalVariableTargetNode, Prism::InstanceVariableTargetNode, Prism::ClassVariableTargetNode, Prism::ConstantTargetNode
    scope[node.name.to_s] = value
  when Prism::ConstantPathTargetNode
    receiver = evaluated_receivers&.[](node.parent) || evaluate(node.parent, scope) if node.parent
    const_path_write receiver, node.child.name.to_s, value, scope
    value
  end
end

#evaluate_x_string_node(_node, _scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 116

def evaluate_x_string_node(_node, _scope)
  KatakataIrb::Types::UnionType[KatakataIrb::Types::STRING, KatakataIrb::Types::NIL]
end

#evaluate_yield_node(node, scope) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 531

def evaluate_yield_node(node, scope)
  evaluate_list_splat_items node.arguments.arguments, scope if node.arguments
  KatakataIrb::Types::OBJECT
end

#method_call(receiver, method_name, args, kwargs, block, scope, name_match: true) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1122

def method_call(receiver, method_name, args, kwargs, block, scope, name_match: true)
  methods = KatakataIrb::Types.rbs_methods receiver, method_name.to_sym, args, kwargs, !!block
  block_called = false
  type_breaks = methods.map do |method, given_params, method_params|
    receiver_vars = receiver.is_a?(KatakataIrb::Types::InstanceType) ? receiver.params : {}
    free_vars = method.type.free_variables - receiver_vars.keys.to_set
    vars = receiver_vars.merge KatakataIrb::Types.match_free_variables(free_vars, method_params, given_params)
    if block && method.block
      params_type = method.block.type.required_positionals.map do |func_param|
        KatakataIrb::Types.from_rbs_type func_param.type, receiver, vars
      end
      self_type = KatakataIrb::Types.from_rbs_type method.block.self_type, receiver, vars if method.block.self_type
      block_response, breaks = block.call params_type, self_type
      block_called = true
      vars.merge! KatakataIrb::Types.match_free_variables(free_vars - vars.keys.to_set, [method.block.type.return_type], [block_response])
    end
    if KatakataIrb::Types.method_return_bottom?(method)
      [nil, breaks]
    else
      [KatakataIrb::Types.from_rbs_type(method.type.return_type, receiver, vars || {}), breaks]
    end
  end
  block&.call [], nil unless block_called
  terminates = !type_breaks.empty? && type_breaks.map(&:first).all?(&:nil?)
  types = type_breaks.map(&:first).compact
  breaks = type_breaks.map(&:last).compact
  types << OBJECT_METHODS[method_name.to_sym] if name_match && OBJECT_METHODS.has_key?(method_name.to_sym)

  if method_name.to_sym == :new
    receiver.types.each do |type|
      if type.is_a?(KatakataIrb::Types::SingletonType) && type.module_or_class.is_a?(Class)
        types << KatakataIrb::Types::InstanceType.new(type.module_or_class)
      end
    end
  end
  scope&.terminate if terminates && breaks.empty?
  KatakataIrb::Types::UnionType[*types, *breaks]
end

#partition_to_array(value, method) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1106

def partition_to_array(value, method)
  arrays, non_arrays = value.types.partition { _1.is_a?(KatakataIrb::Types::InstanceType) && _1.klass == Array }
  non_arrays.select! do |type|
    to_array_result = method_call type, method, [], nil, nil, nil, name_match: false
    if to_array_result.is_a?(KatakataIrb::Types::InstanceType) && to_array_result.klass == Array
      arrays << to_array_result
      false
    else
      true
    end
  end
  array_elem = arrays.empty? ? nil : KatakataIrb::Types::UnionType[*arrays.map { _1.params[:Elem] || KatakataIrb::Types::OBJECT }]
  non_array = non_arrays.empty? ? nil : KatakataIrb::Types::UnionType[*non_arrays]
  [array_elem, non_array]
end

#sized_splat(value, method, size) ⇒ Object 



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# File 'lib/katakata_irb/type_analyzer.rb', line 1099

def sized_splat(value, method, size)
  array_elem, non_array = partition_to_array value, method
  values = [KatakataIrb::Types::UnionType[*array_elem, *non_array]]
  values += [array_elem] * (size - 1) if array_elem && size >= 1
  values
end