PyBison is a Python binding to the Bison (yacc) and Flex (lex) parser-generator utilities. It allows parsers to be quickly and easily developed as Python class declarations, and for these parsers to take advantage of the fast and powerful C-based Bison/Flex. Users write a subclass of a basic Parser object, containing a set of methods and attributes specifying the grammar and lexical analysis rules, and taking callbacks for providing parser input, and receiving parser target events. Features * Runs at near the speed of C-based parsers, due to direct hooks into bison-generated C code * Full LALR(1) grammar support * Includes a utility to convert your legacy grammar (.y) and scanner (.l) scripts into python modules compatible with PyBison * Easy to understand - the walkthrough and the examples will have you writing your own parsers in minutes * Comfortable and intuitive callback mechanisms * Can export parse tree to XML with a simple method call * Can reconstitute a parse tree from XML WWW: http://www.freenet.org.nz/python/pybison/