VPGE - A fast practical GLR parser generator

This paper presents VPGE, an interactive GLR parser generation and debugging system. Its design has been driven by three main concerns: the ability to parse any context free grammar; simplify the parser construction for large legacy systems; visual interactive parser generation and grammar debugging. VPGE is unique in three aspects comparing with the traditional parser generators: a fast GLR parser generator; breakpoint debugging for any grammar positions; flexible grammar conflicts diagnosing and resolving mechanisms.