Coursework from Aston University Programming Language Implementation course 1995.
As part of one of our courses, we wrote a "compiler" that had to parse the grammar for a high level language, do lexical analysis etc and "compile" the program into a set of "machine code" instructions that another program could run. It was also meant to identify syntax errors.
The code is in Modula-2 (.DEF and .MOD files), with sample programs along with their output in .TXT files. Find out more about Modula-2 at http://en.wikipedia.org/wiki/Modula-2
This was written as part of my BSc Computing Science degree, I found it the other day and thought I would put it on here for amusement.
Strangely enough, one of the first things I had to do in my first job after graduating was produce something similar in the C language using Bison and Flex (Compiler compiler tools) for a LISP like language.