PetitParser for Dart

Grammars for programming languages are traditionally specified statically. They are hard to compose and reuse due to ambiguities that inevitably arise. PetitParser combines ideas from scannerless parsing, parser combinators, parsing expression grammars and packrat parsers to model grammars and parsers as objects that can be reconfigured dynamically.

The library is open source, stable and well tested. No breaking API changes are expected in the main library. Development happens on GitHub. Feel free to report issues or create a pull-request there. General questions are best asked on StackOverflow.

Continuous build results are available from Jenkins. An introductionary tutorial is part of the class documentation.

The package comes with a large collections of grammars and language experiments ready to explore:

  • lib/dart.dart contains an experimental Dart grammar.
  • lib/json.dart contains a complete JSON grammar and parser.
  • lib/lisp.dart contains a complete Lisp grammar, parser and evaluator:
  • example/lisphell contains a command line lisp interpreter.
  • example/lispweb contains a web based lisp interpreter.
  • lib/smalltalk.dart contains a complete Smalltalk grammar.
  • lib/xml.dart contains a complete XML parser and AST.

PetitParser was originally implemented in Smalltalk. Later on, as a mean to learn these languages, I reimplemented PetitParser in Java and Dart. The implementations are very similar in their API and the supported features. If possible, the implementations adopt best practises of the target language.



This package contains a experimental features of PetitParser. The code here might be removed or changed in incompatible ways without keeping backward compatiblity.


This package contains a complete grammar of the Dart programming langauge.


This package contains a complete implementation of JSON.


This package contains a simple grammar and evaluator for LISP.


This package contains the core library of PetitParser, a dynamic parser combinator framework.


This package contains the complete grammar of Smalltalk.


This package contains matches to write test for parsers.


This package contains a reasonably complete implementation of an XML parser and its associated AST.