contrib/pep8analysis/src/ast/suffixed_instructions.nit

   1 # Pep/8 instructions are not reserved as keywords. It is common
   2 # that the identifier of an instruction will be used for a label.
   3 # For this reason, we cannot create precise instruction nodes with
   4 # the parser.
   5 #
   6 # This module manually creates the expected subclass with an additionnal
   7 # OOP hiearchy.
   8
   9 module suffixed_instructions
  10
  11 import rich_instructions
  12
  13 #
  14 # Support classes
  15 #
  16 abstract class ARegisterSuffixed
  17         super AInstruction
  18
  19         fun register : Char do return n_id.text.to_upper.last
  20 end
  21
  22 abstract class ADigitSuffixed
  23         super AInstruction
  24
  25         fun digit : Int do return n_id.text.last.to_i
  26         fun digit_max : Int is abstract
  27 end
  28
  29
  30 #
  31 # Other classification
  32 #
  33 redef class AUnaryNopInstruction
  34         super ADigitSuffixed
  35         redef fun digit_max do return (1 << 2)-1
  36 end
  37
  38 redef class ANotInstruction
  39         super ARegisterSuffixed
  40 end
  41
  42 redef class ANegInstruction
  43         super ARegisterSuffixed
  44 end
  45
  46 redef class AShiftInstruction
  47         super ARegisterSuffixed
  48 end
  49
  50 redef class ARetInstruction
  51         super ADigitSuffixed
  52         redef fun digit_max do return (1 << 3)-1
  53 end
  54
  55 redef abstract class AArithmeticInstruction
  56         super ARegisterSuffixed
  57 end
  58
  59 redef abstract class ALoadInstruction
  60         super ARegisterSuffixed
  61 end
  62
  63 redef abstract class AStoreInstruction
  64         super ARegisterSuffixed
  65 end