Class: GirFFI::Builders::PointerValueConvertor

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

Overview

Encapsulates knowledge about how to store values in pointers, and how to fetch values from pointers.

Instance Method Summary collapse

Constructor Details

#initialize(type_spec) ⇒ PointerValueConvertor

Returns a new instance of PointerValueConvertor.



8
9
10
 
# File 'lib/gir_ffi/builders/pointer_value_convertor.rb', line 8

def initialize(type_spec)
  @type_spec = type_spec
end

Instance Method Details

#pointer_to_value(ptr_exp, offset = 0) ⇒ Object 



12
13
14
15
16
17
18
19
 
# File 'lib/gir_ffi/builders/pointer_value_convertor.rb', line 12

def pointer_to_value(ptr_exp, offset = 0)
  case ffi_type_spec
  when Module
    "#{ffi_type_spec}.get_value_from_pointer(#{ptr_exp}, #{offset})"
  when Symbol
    "#{ptr_exp}.get_#{ffi_type_spec}(#{offset})"
  end
end

#value_to_pointer(ptr_exp, value_exp, offset = 0) ⇒ Object 



21
22
23
24
25
26
27
28
29
30
 
# File 'lib/gir_ffi/builders/pointer_value_convertor.rb', line 21

def value_to_pointer(ptr_exp, value_exp, offset = 0)
  case ffi_type_spec
  when Module
    args = [value_exp, ptr_exp]
    args << offset unless offset == 0
    "#{ffi_type_spec}.copy_value_to_pointer(#{args.join(", ")})"
  when Symbol
    "#{ptr_exp}.put_#{ffi_type_spec} #{offset}, #{value_exp}"
  end
end