Langcc: A Next-Generation Compiler Compiler
The auto-generated AST data structures are really the selling point here. Having to manually write an AST for your language and update it if you update your language is mechanical and tedious.I suggest the developer also look into auto-generated visitor / traversal functions as well, as those are also very mechanical and tedious. Another suggestion is to make sure the grammar preserves source information (file, line, column span) and implement re-printing which preserves comments and whitespace in unmodified sections of the AST. I get those are a lot of work though, as-is this is very impressive.