CambridgeScript 🦀

Blazing fast interpreter for Cambridge IGCSE pseudocode

The specification for this language is a subset of the AS & A Level pseudocode. The (mostly accurate) grammer can be found in the old Python repo.

Feel free to open an issue/PR if you have any suggestions/improvements!

Install

Download

Go to the releases tab and download the correct version under assets. Currently only x86 Windows, x86 Linux and Apple silicon Mac are available for download until I figure out how to use GitHub actions.

Self-compile

Requires git and cargo with a nightly toolchain

$ git clone https://github.com/n0Oo0Oo0b/cambridgescript-rs.git
$ cd cambridgescript-rs
$ cargo run --release

Nix

Coming soon

Usage

Running the executable without ay arguments opens a bare-bones REPL (Ctrl+C to exit):

$ ./cambridgescript
CambridgeScript REPL
 1 │ DECLARE x : INTEGER
 2 │ x <- 42
 3 │ OUTPUT 42
 4 │
42

Use cambridgescript [file] to execute a file as a script:

$ cat factorial.txt
DECLARE num : INTEGER
DECLARE result : INTEGER

num <- 6
result <- 1

WHILE num > 1 DO
    result <- result * num
    num <- num - 1
ENDWHILE

OUTPUT "6! = ", result

$ ./cambridgescript factorial.txt
6! = 720

Language features

Statements

• INPUT
• OUTPUT
• a <- b
• IF / IF ELSE
• CASE OF
• FOR
• WHILE
• REPEAT ... UNTIL
• DECLARE (Only for primitive types)
• CONSTANT
• PROCEDURE
• FUNCTION
• FILE(OPEN|READ|WRITE|CLOSE)
• CALLPROCEDURE

Roadmap

• Implement remaining statements
• Arrays
• Nicer errors
• LSP integration (+ VSCode extension)
• Test coverage