tinyap is a recursive descent parser with backup that outputs an abstract syntax tree (AST). Unlike in most parsers, the grammar is data. Tinyap uses an AST that represents a grammar to parse its input text. The factory default for the grammar is tinyap's grammar description language itself, so one can parse a grammar description and directly use the parse output to parse some other text written in the described language. Tinyap also features a plugin mechanism for grammars, which allows for dynamic modular grammars. Finally, it provides an interface to walk down the ASTs and to write external plugins to visit the nodes. License: GNU General Public License v2 Changes: Tinyap now supports AST "unparsing" (or "reverse parsing"). This turns AST back to text, with some formatting support. It can be useful for data (un)serialization and prettyprinting source code.

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