Class: GirFFI::Builders::FieldBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/gir_ffi/builders/field_builder.rb

Overview

Creates field getter and setter code for a given IFieldInfo.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(field_info) ⇒ FieldBuilder

Returns a new instance of FieldBuilder.



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# File 'lib/gir_ffi/builders/field_builder.rb', line 12

def initialize field_info
  @info = field_info
end

Instance Attribute Details

#info ⇒ Object (readonly)

Returns the value of attribute info.



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# File 'lib/gir_ffi/builders/field_builder.rb', line 10

def info
  @info
end

Instance Method Details

#build ⇒ Object 



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# File 'lib/gir_ffi/builders/field_builder.rb', line 16

def build
  setup_getter
  setup_setter
end

#container_defines_getter_method? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gir_ffi/builders/field_builder.rb', line 25

def container_defines_getter_method?
  container_info.find_instance_method info.name
end

#getter_def ⇒ Object 



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# File 'lib/gir_ffi/builders/field_builder.rb', line 37

def getter_def
  builder = return_value_builder

  field_ptr = builder.new_variable
  typed_ptr = builder.new_variable

  <<-CODE.reset_indentation
  def #{info.name}
    #{field_ptr} = @struct.to_ptr + #{info.offset}
    #{typed_ptr} = GirFFI::InOutPointer.new(#{field_type_tag_or_class.inspect}, #{field_ptr})
    #{builder.capture_variable_name} = #{typed_ptr}.to_value
    #{builder.post_conversion.join("\n")}
    #{builder.return_value_name}
  end
  CODE
end

#is_writable_field? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gir_ffi/builders/field_builder.rb', line 33

def is_writable_field?
  info.writable?
end

#setter_def ⇒ Object 



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# File 'lib/gir_ffi/builders/field_builder.rb', line 54

def setter_def
  builder = setter_builder

  field_ptr = builder.new_variable
  typed_ptr = builder.new_variable

  <<-CODE.reset_indentation
  def #{info.name}= #{builder.method_argument_name}
    #{field_ptr} = @struct.to_ptr + #{info.offset}
    #{typed_ptr} = GirFFI::InOutPointer.new(#{field_type_tag_or_class.inspect}, #{field_ptr})
    #{builder.pre_conversion.join("\n          ")}
    #{typed_ptr}.set_value #{builder.callarg}
  end
  CODE
end

#setup_getter ⇒ Object 



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# File 'lib/gir_ffi/builders/field_builder.rb', line 21

def setup_getter
  container_class.class_eval getter_def unless container_defines_getter_method?
end

#setup_setter ⇒ Object 



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# File 'lib/gir_ffi/builders/field_builder.rb', line 29

def setup_setter
  container_class.class_eval setter_def if is_writable_field?
end