Platformer DSL is a project that I and three others completed for our CPSC 410 (Advanced Software Engineering) course. Our project was to create a DSL that would build a game level. It would allows users with a basic knowledge of programming to build a simple Mario-like platformer game. Players win the game when they reach a flag.

Features of the DSL include:

• timed loops
• dynamic game arena size
• moving blocks
• destroying blocks

The project was built using Python3 and the Arcade library.

1. Install Python3
2. Install the Arcade library by running pip3 install arcade in terminal
3. Run git clone on the project repository
4. In terminal, run cd Platformer-DSL

1. Edit the config.txt file (following the EBNF) with desired input
2. Run python3 main.py to see the input DSL get translated into a game

        PROGRAM ::= CONFIGUREARENA? SETPLAYERPOS? (STATEMENT | LOOPSTATEMENT)+
 CONFIGUREARENA ::= "arena size" DIGITTUPLE
   SETPLAYERPOS ::= "put player at" DIGITTUPLE
     DIGITTUPLE ::= DIGIT "," DIGIT // e.g. xpos, ypos
      STATEMENT ::= MAKESTATEMENT | MODIFYSTATMENT
  MAKESTATEMENT ::= "make a" BLOCKTYPE "called" BLOCKNAME "at" DIGITTUPLE
MODIFYSTATEMENT ::= REMOVESTATEMENT | SETSTATEMENT | CHANGESTATEMENT | MOVESTATEMENT
REMOVESTATEMENT ::= "destroy" BLOCKNAME
   SETSTATEMENT ::= "set" FIELD "of" BLOCKNAME "to" DIGIT
CHANGESTATEMENT ::= "change" FIELD "of" BLOCKNAME "by" DIGIT
  MOVESTATEMENT ::= "move" BLOCKNAME DIR "by" DIGIT
  LOOPSTATEMENT ::= "do every" DIGIT TIME ":" (STATEMENT | WAITSTATEMENT)+ "end loop"
  WAITSTATEMENT ::= "wait" DIGIT TIME
           TIME ::= "ms"
      BLOCKTYPE ::= "block" | "goal"
      BLOCKNAME ::= STRING
            DIR ::= "up" | "down" | "left" | "right"
          FIELD ::= POSITION
       POSITION ::= "xpos" | "ypos"
          DIGIT ::= (-)?[0-9]+
        STRING ::= [A-Za-z0-9]+

The tokenizer that we implemented was heavily based off the tokenizer that we have seen in class. A few points to consider, however, are:

1. The tokenizer was written from scratch, since we had to translate into Python from Java.
2. There were changes to the tokenize method to handle whitespaces in our language.
3. Our project was quite substantial in that most of the time was spent on parsing, building the game, and implementing the loop functionality, all of which were original work.