TinyHI Interpreter

An interpreter for TinyHI, a programming language proposed in a 1976 article on Dr. Dobb's Journal (see TinyHi.pdf). This was a school project for a class on parsing, intepreting and translating code (Intepreti e Traduttori in italian). This does not follow exactly the PDFs rules, mostly because they are inconsistent and/or unspecified in some points.

How to use it

First of all you need:

python 3.7 or higher
Antlr for generating the parser

Install the antlr4-runtime pip package and pytest (for running tests). Set the ANTLR4_JAR environment variable to point to your antlr4 jar and run ./antlr_gen.sh to create the parser. If you don't want to set the variable just check inside antlr_gen.sh, it's only 2 lines of code anyway.

To run a program you can write python -m tinyhi Filename.hi. The interpreter is also a python module so it's easy to integrate with other applications, just import it and call tinyhi.run(source_code)

Here is a program that calculates the factorial and prints it:

BEGIN TEST
    BEGIN DOIT(N)
        BEGIN FACT(N)
            IF N = 0
                FACT <- 1
            ELSE
                FACT <- N * FACT(N - 1)
            END
        END
        DOIT <- FACT(2 * N)
    END
    DOIT(3)
END