Class: Rust::CWrapperGenerator::WrapperFn

Inherits:
Object
  • Object
show all
Defined in:
lib/rust_require/c_wrapper_generator.rb

Overview

Rust code of a wrapper function

Instance Method Summary collapse

Constructor Details

#initialize(original_name, inputs, output) ⇒ WrapperFn

original_name: name of the fn to be wrapped (String) inputs: input types in order (Array) output: output type (String || nil)



46
47
48
49
50
 
# File 'lib/rust_require/c_wrapper_generator.rb', line 46

def initialize(original_name, inputs, output)
  @original_name = original_name
  @inputs = inputs
  @output = output
end

Instance Method Details

#to_s ⇒ Object

returns string of rust code



53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
 
# File 'lib/rust_require/c_wrapper_generator.rb', line 53

def to_s
  # convert inputs
  input_types = @inputs.map  { |t| Rust::Types.find_type(t) }
  c_inputs = input_types.map { |t| t.c_input_type } #C input types ([String])
  input_str = c_inputs.map.with_index { |t,i| "c#{i}: #{t}" }.join(',') #fn foo_wrapper(input_str) ...
  input_conversions = input_types.map.with_index { |t,i| t.c_input_conversion("c#{i}") }.join(",") #code used to convert input types to c types

  # convert output
  output_type = Rust::Types.find_type(@output)
  c_output = output_type.c_output_type
  output_conversion = output_type.c_output_conversion('output')

  "    #[no_mangle]\n    pub extern \"C\" fn _\#{@original_name.gsub('::','_')}_wrapper(\#{input_str}) -> \#{c_output} {\n      let output = \#{@original_name}(\#{input_conversions});\n      \#{output_conversion}\n    }\n  END\nend\n"