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grammar.md

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Grammar of lutcc

Terminal symbols

Keywords:

  • con = const
  • var = var
  • ecr = ecrire
  • lir = lire

Operators:

  • aff = affectation (/^:=/)
  • plu = +
  • min = -
  • mul = *
  • div = /
  • opp = (
  • com = ,
  • clo = )
  • col = ;
  • equ = =

Operands:

  • idv = name of a variable
  • num = number (positive integer)

Non-terminal symbols

  • A = Axiom
  • P = Program
  • Ld = List of declarations (may be empty)
  • Li = List of instructions (at least one)
  • D = Declaration
  • Lv = List of variables (may be empty)
  • Lc = List of constants (may be empty)
  • I = Instruction
  • E = Expression

Grammar rules

  1. A -> P

  2. P -> Ld Li

  3. Ld -> Ld D

  4. Ld -> ε

  5. Li -> Li I

  6. Li -> I

  7. D -> var idv Lv ;

  8. D -> con idv = num Lc ;

  9. Lv -> Lv , idv

  10. Lv -> ε

  11. Lc -> , idv = num

  12. Lc -> ε

  13. I -> idv := E ;

  14. I -> ecr E ;

  15. I -> lir idv ;

  16. E -> E + E

  17. E -> E - E

  18. E -> E * E

  19. E -> E / E

  20. E -> (E)

  21. E -> idv

  22. E -> num