A packrat parsing library
Packrat parsing is a memoizing, backtracking recursive-descent parsing technique that runs in time and space linear in the size of the input text. The technique was originally discovered by Alexander Birman in 1970 , and Bryan Ford took up the idea for his master's thesis in 2002.
For detailed information on the technique, please see Bryan Ford's web page at http://pdos.csail.mit.edu/~baford/packrat/.
A reference manual can be found here: packrat.pdf.
To use the packrat API, import the packrat module.
This egg is hosted by the CHICKEN subversion server. You can check it out with
$ svn co https://code.call-cc.org/svn/chicken-eggs/release/4/packrat
You can use the anonymous user and empty password or authenticate with your own user in case you have one.
Note that the URL points to the CHICKEN 4 version, as the code for CHICKEN 4 and CHICKEN 5 is the same (with some cond-expands). To avoid duplication of the `trunk' directory, the /release/4/packrat/trunk directory has been kept as the canonical development directory. Releases are published to the CHICKEN version-specific directories accordingly (/release/4/packrat/tags and /release/5/packrat/tags).
Copyright (c) 2004, 2005 Tony Garnock-Jones <email@example.com> Copyright (c) 2005 LShift Ltd. <firstname.lastname@example.org> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- CHICKEN 5 support (Mario Goulart)
- .setup script fixes (felix)
- Ported to CHICKEN 4
- Added use of srfi-1
- Initial release