Class: RBS::Subtractor

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

Instance Method Summary collapse

Constructor Details

#initialize(minuend, subtrahend) ⇒ Subtractor

Returns a new instance of Subtractor.



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# File 'lib/rbs/subtractor.rb', line 5

def initialize(minuend, subtrahend)
  @minuend = minuend
  @subtrahend = subtrahend
end

Instance Method Details

#call(minuend = @minuend, context: nil) ⇒ Object 



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

def call(minuend = @minuend, context: nil)
  minuend.map do |decl|
    case decl
    when AST::Declarations::Constant
      name = absolute_typename(decl.name, context: context)
      decl unless @subtrahend.constant_name?(name)
    when AST::Declarations::Interface
      name = absolute_typename(decl.name, context: context)
      decl unless @subtrahend.interface_name?(name)
    when AST::Declarations::Class, AST::Declarations::Module
      name = absolute_typename(decl.name, context: context)
      case
      when @subtrahend.class_decl?(name) && decl.is_a?(AST::Declarations::Class)
        filter_members(decl, context: context)
      when @subtrahend.module_decl?(name) && decl.is_a?(AST::Declarations::Module)
        filter_members(decl, context: context)
      when @subtrahend.constant_name?(name)
        nil
      else
        decl
      end
    when AST::Declarations::Global
      decl unless @subtrahend.global_decls[decl.name]
    when AST::Declarations::TypeAlias
      name = absolute_typename(decl.name, context: context)
      decl unless @subtrahend.type_alias_decls[name]
    when AST::Declarations::ClassAlias
      name = absolute_typename(decl.new_name, context: context)
      decl unless @subtrahend.class_alias?(name) || @subtrahend.class_decl?(name)
    when AST::Declarations::ModuleAlias
      name = absolute_typename(decl.new_name, context: context)
      decl unless @subtrahend.module_alias?(name) || @subtrahend.module_decl?(name)
    else
      raise "unknwon decl: #{(_ = decl).class}"
    end
  end.compact
end