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Thanks for the link, I'll have to check it out! I've been hacking on an old, public domain shell called es in my spare time and have made some minor progess so far. One of my goals is to eliminate the reliance on a parser generator like Yacc and instead implement my own LALR or LR(1) parser, and was planning on trying to swap out the current Yacc file for something like lemon to start getting a better understanding of what's needed.
The Yacc grammar and the parse tree are intrinsically linked and it works well, there are many other design holes in the es shell.