CIE Pseudo-Code Compiler

This is a pseudo-code compiler for the CIE IGCSE and AS&A Levels Computer Science course. It is designed to be used with 0478/9718/9708.

I am using the official CIE pseudo-code specification as a reference for this compiler. You can find the specification here.

Small rant

WHY IS IT CALLED PSEUDOCODE IF IT CAN BE COMPILED? IT'S NOT PSEUDOCODE IF IT CAN BE COMPILED. IT'S A REAL PROGRAMMING LANGUAGE. IT'S NOT PSEUDO.

How does it work?

The compiler is not exactly a compiler, I am using ply (Python Lex-Yacc) to parse the pseudo-code and convert it to an abstract syntax tree (AST). I then use the AST to generate C++ code, and call g++ to compile the generated C++ code.

How to use

1. Write your pseudo-code in a file (e.g. code.psc)
2. Run the compiler with the file as an argument (e.g. python main.py code.psc)
3. The generated C++ code will be in temp/temp.cpp
4. The compiled binary will be in temp/temp(.exe)
5. If the -r flag is used, the compiled binary will be run

Requirements

• Python 3
• gcc (for compiling the generated C++ code)

Limitations (for now)

• No PEMDAS/BODMAS support, use brackets to enforce order of operations
• Only the following are supported right now
  • IF statements (with or without ELSE)
  • REPEAT loops
  • FOR loops
  • WHILE loops
  • All data types except DATE
  • All variable types except CONSTANT
  • OUTPUT and INPUT statements
  • Multi-expression OUTPUT statements
  • All arithmetic operators
  • AND, OR, NOT logical operators
  • All comparison operators
  • DECLARE and <- assignment operators
  • More things I can't remember right now
  • PROCEDURE definitions with or without parameters
  • FUNCTION definitions with or without parameters
  • expression evaluation of function calls
  • CALL statements with or without parameters
• Haven't tested on linux or mac yet, probably won't work

Usage

$ python main.py -h
usage: main.py [-h] [-o OUTPUT] [-c CFILE] [-r] [-d] file

positional arguments:
  file                  The file to compile

options:
  -h, --help            show this help message and exit
  -o OUTPUT, --output OUTPUT
                        The output file
  -c CFILE, --cfile CFILE
                        The C file to generate
  -r, --run             Run the compiled file
  -d, --debug           Debug output