Class: RDL::Wrap

Inherits:
Object
  • Object
show all
Defined in:
lib/rdl/wrap.rb

Class Method Summary collapse

Class Method Details

.get_type_params(klass) ⇒ Object 



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# File 'lib/rdl/wrap.rb', line 18

def self.get_type_params(klass)
  klass = klass.to_s
  RDL::Globals.type_params[klass]
end

.process_pre_post_args(default_class, name, *args, &blk) ⇒ Object

default_class

should be a class

name

is the name to give the block as a contract

Raises:

  • (ArgumentError) 


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# File 'lib/rdl/wrap.rb', line 89

def self.process_pre_post_args(default_class, name, *args, &blk)
  klass = slf = meth = contract = nil
  default_class = "Object" if (default_class.is_a? Object) && (default_class.to_s == "main") # special case for main
  if args.size == 3
    klass = class_to_string args[0]
    slf, meth = meth_to_sym args[1]
    contract = args[2]
  elsif args.size == 2 && blk
    klass = class_to_string args[0]
    slf, meth = meth_to_sym args[1]
    contract = RDL::Contract::FlatContract.new(name, &blk)
  elsif args.size == 2
    klass = default_class.to_s
    slf, meth = meth_to_sym args[0]
    contract = args[1]
  elsif args.size == 1 && blk
    klass = default_class.to_s
    slf, meth = meth_to_sym args[0]
    contract = RDL::Contract::FlatContract.new(name, &blk)
  elsif args.size == 1
    klass = default_class.to_s
    contract = args[0]
  elsif blk
    klass = default_class.to_s
    contract = RDL::Contract::FlatContract.new(name, &blk)
  else
    raise ArgumentError, "Invalid arguments to `pre` or `post`"
  end
  raise ArgumentError, "#{contract.class} received where Contract expected" unless contract.class < RDL::Contract::Contract
#    meth = :initialize if meth && meth.to_sym == :new  # actually wrap constructor
  klass = RDL::Util.add_singleton_marker(klass) if slf # && (meth != :initialize)
  return [klass, meth, contract]
end

.process_type_args(default_class, *args) ⇒ Object

default_class

should be a class

Raises:

  • (ArgumentError) 


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# File 'lib/rdl/wrap.rb', line 124

def self.process_type_args(default_class, *args)
  klass = meth = type = nil
  default_class = "Object" if (default_class.is_a? Object) && (default_class.to_s == "main") # special case for main
  if args.size == 3
    klass = class_to_string args[0]
    slf, meth = meth_to_sym args[1]
    type = type_to_type args[2]
  elsif args.size == 2
    klass = default_class.to_s
    slf, meth = meth_to_sym args[0]
    type = type_to_type args[1]
  elsif args.size == 1
    klass = default_class.to_s
    type = type_to_type args[0]
  else
    raise ArgumentError, "Invalid arguments to `type`"
  end
  raise ArgumentError, "Excepting method type, got #{type.class} instead" if type.class != RDL::Type::MethodType
#    meth = :initialize if meth && slf && meth.to_sym == :new  # actually wrap constructor
  klass = RDL::Util.add_singleton_marker(klass) if slf
  return [klass, meth, type]
end

.resolve_alias(klass, meth) ⇒ Object 



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# File 'lib/rdl/wrap.rb', line 6

def self.resolve_alias(klass, meth)
  klass = klass.to_s
  meth = meth.to_sym
  while RDL::Globals.aliases[klass] && RDL::Globals.aliases[klass][meth]
    if RDL::Globals.info.has_any?(klass, meth, [:pre, :post, :type])
      raise RuntimeError, "Alias #{RDL::Util.pp_klass_method(klass, meth)} has contracts. Contracts are only allowed on methods, not aliases."
    end
    meth = RDL::Globals.aliases[klass][meth]
  end
  return meth
end

.wrap(klass_str, meth) ⇒ Object

klass

may be a Class, String, or Symbol

meth

may be a String or Symbol

Wraps klass#method to check contracts and types. Does not rewrap if already wrapped. Also records source location of method.



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# File 'lib/rdl/wrap.rb', line 28

def self.wrap(klass_str, meth)
  RDL::Globals.wrap_switch.off {
    klass_str = klass_str.to_s
    klass = RDL::Util.to_class klass_str
    return if wrapped? klass, meth
    return if RDL::Config.instance.nowrap.member? klass_str.to_sym
    raise ArgumentError, "Attempt to wrap #{RDL::Util.pp_klass_method(klass, meth)}" if klass.to_s =~ /^RDL::/
    meth_old = wrapped_name(klass, meth) # meth_old is a symbol
    # return if (klass.method_defined? meth_old) # now checked above by wrapped? call
    is_singleton_method = RDL::Util.has_singleton_marker(klass_str)
    full_method_name = RDL::Util.pp_klass_method(klass_str, meth)
    klass_str_without_singleton = if is_singleton_method then RDL::Util.remove_singleton_marker(klass_str) else klass_str end

    klass.class_eval <<-RUBY, __FILE__, __LINE__
      alias_method meth_old, meth
      def #{meth}(*args, &blk)
        klass = "#{klass_str}"
        meth = types = matches = nil
       bind = binding
        inst = nil

        RDL::Globals.wrap_switch.off {
          RDL::Globals.wrapped_calls["#{full_method_name}"] += 1 if RDL::Config.instance.gather_stats
          inst = nil
          inst = @__rdl_type.to_inst if ((defined? @__rdl_type) && @__rdl_type.is_a?(RDL::Type::GenericType))
          inst = Hash[RDL::Globals.type_params[klass][0].zip []] if (not(inst) && RDL::Globals.type_params[klass])
          inst = {} if not inst
          #{if not(is_singleton_method) then "inst[:self] = RDL::Type::NominalType.new(self.class)" end}
#            puts "Intercepted #{full_method_name}(\#{args.join(", ")}) { \#{blk} }, inst = \#{inst.inspect}"
          meth = RDL::Wrap.resolve_alias(klass, #{meth.inspect})
          RDL::Typecheck.typecheck(klass, meth) if RDL::Globals.info.get(klass, meth, :typecheck) == :call
          pres = RDL::Globals.info.get(klass, meth, :pre)
          RDL::Contract::AndContract.check_array(pres, self, *args, &blk) if pres
          types = RDL::Globals.info.get(klass, meth, :type)
          if types
            matches, args, blk, bind = RDL::Type::MethodType.check_arg_types("#{full_method_name}", self, bind, types, inst, *args, &blk)
          end
        }
       ret = send(#{meth_old.inspect}, *args, &blk)
        RDL::Globals.wrap_switch.off {
          posts = RDL::Globals.info.get(klass, meth, :post)
          RDL::Contract::AndContract.check_array(posts, self, ret, *args, &blk) if posts
          if matches
            ret = RDL::Type::MethodType.check_ret_types(self, "#{full_method_name}", types, inst, matches, ret, bind, *args, &blk)
          end
          if RDL::Config.instance.guess_types.include?("#{klass_str_without_singleton}".to_sym)
            RDL::Globals.info.add(klass, meth, :otype, { args: (args.map { |arg| arg.class }), ret: ret.class, block: block_given? })
          end
          return ret
        }
      end
      if (public_method_defined? meth_old) then public meth
      elsif (protected_method_defined? meth_old) then protected meth
      elsif (private_method_defined? meth_old) then private meth
      end
RUBY
  }
end

.wrapped?(klass, meth) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rdl/wrap.rb', line 2

def self.wrapped?(klass, meth)
  RDL::Util.method_defined?(klass, wrapped_name(klass, meth))
end