Earley parser, capable of parsing any context-free grammar
Implements SPPF, for efficient parsing and storing of ambiguous grammars.
LALR(1) parser, limited in power of expression, but very efficient in space and performance (O(n)).
Implements a parse-aware lexer that provides a better power of expression than traditional LALR implementations (such as ply).
EBNF-inspired grammar, with extra features (See: Grammar Reference)
Builds a parse-tree (AST) automagically based on the grammar
Stand-alone parser generator - create a small independent parser to embed in your project. (read more)
Flexible error handling by using an interactive parser interface (LALR only)
Automatic line & column tracking (for both tokens and matched rules)
Automatic terminal collision resolution
Warns on regex collisions using the optional
interegularlibrary. (read more)
Grammar composition - Import terminals and rules from other grammars (see example).
Standard library of terminals (strings, numbers, names, etc.)
Unicode fully supported
Extensive test suite
Type annotations (MyPy support)