lascra (Lisp and Scratch)

lascra is a compiler that compiles a lisp like language into scratch sprite3 files

Information

• Documentation in docs folder
• Examples in the examples folder
• All base scratch blocks are supported
• Some blocks from extensions are supported
  • Pen extension is fully supported
• A web version can be compiled using Emscripten

Usage

lascra *.sprite3 (--sprite spriteName) [--remove,--keep] codeFiles...

• Opens sprite.json in sprite.sprite3
  • --sprite spriteName: Opens the spriteName sprite in project.json in project.sb3
• Deletes existing lascra-generated code
  • --remove: Removes all existing code
  • --keep: Keeps all existing code
• Compiles code files
• Save generated code

Example Usage

1. Export a Sprite in the scratch editor called "MySprite"
   
2. Run lascra MySprite.sprite3 examples/example.scra Contents of example.scra:

(declare
    (name MySprite)
)
(define
    (variable counter 0)
)
(procedure say_wait (Say (string message) and wait for (number seconds) seconds)
    (say (argument message) )
    (wait (argument seconds) )
)
(when flag
    (call say_wait "Hello World!" 15)
    (say (join
        "2*4+3="
        (+ (* 2 4) 3)
    ) )
    (wait 5)
    (set counter 0)
    (say "Counting to 10")
    (wait 5)
    (repeat_until (= (variable counter) 10)
        (wait 1)
        (change counter 1)
        (say (join
            "Value of Counter: "
            (variable counter)
        ) )
    )
    (wait 1)
    (say "Done!")
    (wait 5)
    (ask "What is 2+2?")
    (if (= (value answer) 4)
        (say "Correct!")
    )
    (elif (= (value answer) 0)
        (say "That would be for subtraction")
    )
    (else
        (say "Incorrect")
    )
)

3. Upload the edited Sprite file in the scratch editor
   

This results in the following code: