Class: Overloader::Core

Inherits:
Object
  • Object
show all
Defined in:
lib/overloader/core.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass, proc) ⇒ Core

Returns a new instance of Core.



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# File 'lib/overloader/core.rb', line 9

def initialize(klass, proc)
  @klass = klass
  @proc = proc
end

Class Method Details

.define_overload(klass, proc) ⇒ Object 



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# File 'lib/overloader/core.rb', line 5

def self.define_overload(klass, proc)
  new(klass, proc).define_overload
end

Instance Method Details

#define_overload ⇒ Object 



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# File 'lib/overloader/core.rb', line 14

def define_overload
  ast = RubyVM::AbstractSyntaxTree.of(@proc)
  methods = {}
  ast.find_nodes(:DEFN).each.with_index do |def_node, index|
    args = def_node.method_args
    body = def_node.method_body
    name = def_node.method_name
    args_source = args.to_source(absolute_path)
    args_source = "" if args_source == "(" # RubyVM::AST's bug?

    @klass.class_eval <<~RUBY
      def __#{name}_#{index}_checker_inner(#{args_source}) end
      def __#{name}_#{index}_checker(*args)
        __#{name}_#{index}_checker_inner(*args)
        #{type_check_code(def_node, name)}
      rescue ArgumentError
        false
      end
    RUBY

    @klass.class_eval <<~RUBY, absolute_path, def_node.first_lineno
      def __#{name}_#{index}(#{args_source})
      #{body.to_source(absolute_path)}
      end
    RUBY
    (methods[name] ||= []) << index
  end

  methods.each do |name, indexes|
    @klass.class_eval <<~RUBY
      def #{name}(*args, &block)
        #{indexes.map do |index|
          "return __#{name}_#{index}(*args, &block) if __#{name}_#{index}_checker(*args)"
        end.join("\n")}
        raise ArgumentError
      end
    RUBY
  end
end

#type_check_code(def_node, method_name) ⇒ Object 



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# File 'lib/overloader/core.rb', line 54

def type_check_code(def_node, method_name)
  return 'true' unless defined?(::Overloader::Type)

  comment = def_node.comment(path: absolute_path)
  return 'true' unless comment

  type = comment.sub(/^\s*#/, '')

  "::Overloader::Type.callable?(#{type.dump}, self.class, #{method_name.inspect}, *args)"
end