/
mapping_method_builder.rb
81 lines (66 loc) · 2.32 KB
/
mapping_method_builder.rb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
require 'gir_ffi/variable_name_generator'
require 'gir_ffi/builders/callback_argument_builder'
require 'gir_ffi/builders/callback_return_value_builder'
require 'gir_ffi/builders/argument_builder_collection'
require 'gir_ffi/builders/method_template'
module GirFFI
module Builders
# Implements the creation mapping method for a callback or signal
# handler. This method converts arguments from C to Ruby, and the
# result from Ruby to C.
class MappingMethodBuilder
def self.for_callback argument_infos, return_value_info
new argument_infos, return_value_info
end
def self.for_vfunc receiver_info, argument_infos, return_value_info
new receiver_info, argument_infos, return_value_info
end
def initialize receiver_info = nil, argument_infos, return_value_info
receiver_builder = make_argument_builder receiver_info if receiver_info
argument_builders = argument_infos.map { |info| make_argument_builder info }
return_value_builder =
CallbackReturnValueBuilder.new(variable_generator, return_value_info)
@argument_builder_collection =
ArgumentBuilderCollection.new(return_value_builder, argument_builders,
receiver_builder: receiver_builder)
@template = MethodTemplate.new(self, @argument_builder_collection)
end
def method_definition
@template.method_definition
end
def method_name
'call_with_argument_mapping'
end
def method_arguments
@method_arguments ||=
@argument_builder_collection.method_argument_names.dup.unshift('_proc')
end
def preparation
[]
end
def invocation
"_proc.call(#{call_argument_list})"
end
def result
if (name = @argument_builder_collection.return_value_name)
["return #{name}"]
else
[]
end
end
def singleton_method?
true
end
private
def call_argument_list
@argument_builder_collection.call_argument_names.join(', ')
end
def variable_generator
@variable_generator ||= VariableNameGenerator.new
end
def make_argument_builder argument_info
CallbackArgumentBuilder.new variable_generator, argument_info
end
end
end
end