/toy-interpreter

MIT LicenseMIT

toy-interpreter

Prepared as a toy example for IN104 to demonstrate to students the creation of their own language and interpreter.

The current project uses:

  • Flex (as the lexer)
  • Bison (as the Parser)
  • C (for the interpreter itself)

Small documentation:

LOTR Quotes based language ;_;

  • Brackets define a function - ()
  • Indents define scope
  • Every program must contain a main function named: "FLY YOU FOOLS"
  • functions must be defined as GANDALF SAYS
  • Errors should be presented as: FOOL OF A TOOK
  • Return statements: MY PRECIOUS
  • for: WANDER OVER UNTIL
  • while: RENEW BLADE
  • integers/floats : POTATOES
  • strings: STEW
  • assignment operator ":="
  • print: MELLON (say friend, and enter)
  • comments : #
  • if-else statements are enclosed as : IF TAKING THE RING (condition) UNKNOWN WAY (condition)

Example:


GANDALF SAYS print_10_ints():
    POTATO counter :=10
    POTATO i
    WANDER OVER i UNTIL (0, counter, 1)
        MELLON i

GANDALF SAYS print_ints_here():
    POTATO counter := 0
    POTATO done := False
    IF counter < 10 TAKING THE RING
        MELLON counter
        counter := counter + 1 
    done := True
    MY PRECIOUS done 

FLY YOU FOOLS:
    STEW success:= "We are done here"
    done := print_ints_here()
    IF done TAKING THE RING
        MELLON success