Class: GirFFI::Builders::CallbackArgumentBuilder

Inherits:
BaseArgumentBuilder show all
Defined in:
lib/gir_ffi/builders/callback_argument_builder.rb

Overview

Convertor for arguments for ruby callbacks. Used when building the argument mapper for callbacks.

Direct Known Subclasses

ClosureArgumentBuilder, VFuncArgumentBuilder

Constant Summary

Constants inherited from BaseArgumentBuilder

BaseArgumentBuilder::KEYWORDS

Instance Attribute Summary

Attributes inherited from BaseArgumentBuilder

#arginfo, #array_arg, #length_arg, #related_callback_builder

Instance Method Summary collapse

Methods inherited from BaseArgumentBuilder

#argument_class_name, #array_length_idx, #array_length_parameter?, #closure_idx, #destroy_idx, #destroy_notifier?, #direction, #helper_argument?, #initialize, #mark_as_destroy_notifier, #mark_as_user_data, #name, #new_variable, #ownership_transfer, #safe, #specialized_type_tag, #type_info, #user_data?

Constructor Details

This class inherits a constructor from GirFFI::Builders::BaseArgumentBuilder

Instance Method Details

#allow_none? ⇒ Boolean

All arguments to the argument mapper must always be provided. They may be nil, though.

Returns:



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 24

def allow_none?
  false
end

#block_argument? ⇒ Boolean

Returns:



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 18

def block_argument?
  false
end

#call_argument_name ⇒ Object 



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 41

def call_argument_name
  pre_converted_name if [:in, :inout].include?(direction) && !array_arg
end

#capture_variable_name ⇒ Object 



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 45

def capture_variable_name
  result_name if [:out, :inout].include?(direction) && !array_arg
end

#method_argument_name ⇒ Object 



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 14

def method_argument_name
  @method_argument_name ||= name || new_variable
end

#out_parameter_name ⇒ Object 



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 32

def out_parameter_name
  @out_parameter_name ||=
    if direction == :inout
      new_variable
    else
      pre_converted_name
    end
end

#post_conversion ⇒ Object 



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 62

def post_conversion
  case direction
  when :out, :inout
    [value_to_pointer_conversion]
  when :error
    [
      "rescue => #{result_name}",
      value_to_pointer_conversion,
      "end"
    ]
  else
    []
  end
end

#pre_conversion ⇒ Object 



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 49

def pre_conversion
  case direction
  when :in
    [ingoing_pre_conversion]
  when :out
    [out_parameter_preparation]
  when :inout
    [out_parameter_preparation, ingoing_pre_conversion]
  when :error
    [out_parameter_preparation, "begin"]
  end
end

#pre_converted_name ⇒ Object 



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# File 'lib/gir_ffi/builders/callback_argument_builder.rb', line 28

def pre_converted_name
  @pre_converted_name ||= new_variable
end