I am working on a compiler for my new language. I went from learning about Yacc at the university (reaction: disgust) to discovering PEG (reaction: I should build my own parser generator!) to wisdom (reaction: just write the damn thing by hand and be done with it!)<p>I have a few basic reasons why I now think parser generators are a mistake for my purpose:
1) It is hard to learn all the details of a particular parser generator that you need for a complex parsing project. 2) The mix of grammar and semantic actions one has to come up with is ugly and complex. 3) The output is both ugly and hard to debug.<p>The most complicated part of a compiler is not recognizing good input, put doing something with it. A hand-written recursive descent parser can be a thing of beauty and simplicity that increases the joy of working on the meat of the compiler, that is semantics!