Right-Nulled GLR Parsing: Gracefully Handling Context-Free Grammars
2025-01-15
This article delves into Generalized LR (GLR) parsing and its improvement, Right-Nulled GLR (RNGLR) parsing. GLR parsing can handle any context-free grammar without restrictions, making it a useful prototyping tool. However, traditional GLR parsing suffers from efficiency issues when dealing with hidden left and right recursion. RNGLR parsing elegantly addresses these issues by cleverly handling right-nulled rules, improving parsing efficiency. The article explains the principles of RNGLR parsing and demonstrates its advantages in handling conflicts and constructing Shared Packed Parse Forests (SPPFs) through examples.