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Initial commit of PyBison (version 0.1.8)

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Version 0.1.7:
2004-04-30:
- Added scientific calculator example (calc1)
- Added support for error-handling rules
- Added support for rule handlers to raise errors
Version 0.1.6:
2004-04-30:
- Added ANSI C parser to examples
Version 0.1.5:
2004-04-30:
- Added XML support - can now export and import parse trees to/from
XML strings or xml.dom.minidom objects
Version 0.1.4:
2004-04-29:
- Improved the layout and usability of python parser files generated
by the bison2py utility, particularly with the '-c' option enabled
- fixed the 'template' example, so that it actually works if used as is
- tidied up and fleshed out the walkthrough document
Version 0.1.3:
2004-04-28:
- java example:
- replaced grammar file with an adapted version of one
from the GNU gcj compiler source - the damn thing works now!
- fixed lex script
- core - added support for a 'debug' flag keyword argument to Parser.run(),
which causes the bison-generated parser to haemorrhage out all manner of
detailed debug info
- various other fixes and tidy-ups
Version 0.1.2:
2004-04-25:
- moved pure-python code from bison.pyx (now renamed to bison_.pyx),
into a new file 'bison.py'.
- patched by Eugene Oden to fix bug in processing legacy rules files
in cases where rules contained character literals
- added '-c' option to bison2py utility, which causes the generation
of handler code as separate node classes instead of methods
Version 0.1.1:
2004-04-23:
- changed call signature for user target callbacks, to a much faster and
more convenient form
- fixed several fatal bugs
- added java parser example
Version 0.1.0:
2004-04-23:
- first release
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PyBison was designed and written by David McNab <david@freenet.org.nz>.
---------------------
Ideas for the class model were borrowed from the PLY Python Parser
Builder toolkit - http://systems.cs.uchicago.edu/ply/
----------------------
The javaparser.l and javaparser.y files in the examples/ directory
are based (almost verbatim) on scripts written by
Professor Dave Binkley
(http://www.cs.loyola.edu/~binkley/)
at the Department of Computer Science at Loyola College in Maryland
(http://www.cs.loyola.edu/)
(permission pending)
INSTALL 0 → 100644
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INSTALL file for PyBison
1. Prerequisites
You will need:
- Python 2.2 or later, with development headers and libraries
- GNU bison (or yacc) - www.gnu.org or gnuwin32.sf.net
- GNU flex (or lex) - ditto
- The Pyrex Python/C wrapper creation framework:
- http://www.cosc.canterbury.ac.nz/~greg/python/Pyrex/
- A standard C compiler and linker
2. Installing
- Crack the tarball somewhere convenient (eg your home directory)
- cd into the top level directory of this package
- become root, and type 'python setup.py install'
With all going well, you should see a bunch of harmless warning messages
from the compilation of bison.c, but no errors.
The following commands will verify if the installation succeeded:
$ which bison2py
/usr/bin/bison2py
$ python -c "import bison"
$
Makefile 0 → 100644
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#@+leo-ver=4
#@+node:@file Makefile
#all: java-grammar
PY_INCLUDE=/usr/include/python2.3
all: module doco
module:
python setup.py build
install:
python setup.py install
doco:
epydoc -n "PyBison API Reference" -o doc/api build/lib*/bison.py
clean:
rm -rf *~ *.output tokens.h *.tab.* *.yy.c java-grammar new.* *.o *.so dummy build *.pxi *-lexer.c
rm -rf *-parser.y *-parser.c *-parser.h pybison.c pybison.h
rm -rf bison.c bison.h
rm -rf *.pyc
rm -rf tmp.*
rm -f src/pyrex/bison_.pxi src/pyrex/bison_.c src/pyrex/bison_.h
#@-node:@file Makefile
#@-leo
README 0 → 100644
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Welcome to PyBison
Bringing GNU Bison/Flex's raw speed and power to Python
1) What is PyBison?
PyBison is a framework which effectively 'wraps' Bison and Flex into a Python
class structure.
You define a parser class, define tokens and precedences as attributes,
and parse targets as methods with rules in the docstrings,
then instantiate and run.
Black Magick happens in the background, whereupon you get callbacks each
time yyparse() resolves a parse target.
2) There are already parsers for Python. Why re-invent the wheel?
I looked at all the Python-based parsing frameworks.
IMO, the best one was PLY - a pure-python lexx/yacc implementation
(which I have borrowed from heavily in designing PyBison's OO model).
But PLY suffers some major limitations:
* usage of 'named groups' regular expressions in the lexer creates
a hard limit of 100 tokens - not enough to comfortably handle major
languages
* pure-python implementation is a convenience, but incurs a cruel
performance penalty
* the parser engine is SLR, not full LALR(1)
The other frameworks utilise a fiddly script syntax -
3) How do I use this?
Refer to the INSTALL file for setting up.
Refer to the examples and the doco for usage.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN">
<html>
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<title> PyBison API Reference </title>
</head>
<frameset cols="20%,80%">
<frameset rows="30%,70%">
<frame src="public/toc.html" name="moduleListFrame">
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Module&nbsp;bison
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<!-- =========== START OF MODULE DESCRIPTION =========== -->
<h2 class="module">Module bison</h2>
<p>Wrapper module for interfacing with Bison (yacc)</p>
<p>Written April 2004 by David McNab &lt;david&#64;freenet.org.nz&gt;
Copyright (c) 2004 by David McNab, all rights reserved.</p>
<p>Released under the GNU General Public License, a copy of which should
appear in this distribution in the file called 'COPYING'. If this file is
missing, then you can obtain a copy of the GPL license document from the
GNU website at http://www.gnu.org.</p>
<p>This software is released with no warranty whatsoever. Use it at your
own risk.</p>
If you wish to use this software in a commercial application, and wish
to depart from the GPL licensing requirements, please contact the author
and apply for a commercial license.
<hr/>
<!-- =========== START OF CLASSES =========== -->
<table class="summary" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="summary">
<th colspan="2">Classes</th></tr>
<tr><td width="15%">
<b><a href="bison.BisonError-class.html"><code>BisonError</code></a></b></td>
<td>Flags an error to yyparse()</td></tr>
<tr><td width="15%">
<b><a href="bison.BisonNode-class.html"><code>BisonNode</code></a></b></td>
<td>Generic class for wrapping parse targets.</td></tr>
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<b><a href="bison.BisonParser-class.html"><code>BisonParser</code></a></b></td>
<td>Base parser class</td></tr>
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<b><a href="bison.ParserSyntaxError-class.html"><code>ParserSyntaxError</code></a></b></td>
<td>&nbsp;</td></tr>
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<!-- =========== START OF FUNCTION SUMMARY =========== -->
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<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
<td><code><span class="summary-sig"><a href="bison-module.html#bisonToPython" class="summary-sig-name"><code>bisonToPython</code></a>(<span class=summary-sig-arg>bisonfileName</span>,
<span class=summary-sig-arg>lexfileName</span>,
<span class=summary-sig-arg>pyfileName</span>,
<span class=summary-sig-arg>generateClasses</span>)</span></code>
<br />
Rips the rules, tokens and precedences from a bison file, and the
verbatim text from a lex file and generates a boilerplate python file
containing a Parser class with handler methods and grammar attributes</td></tr>
</table><br />
<!-- =========== START OF VARIABLE SUMMARY =========== -->
<table class="summary" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white">
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<th colspan="2">Variable Summary</th></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"><code>SRE_Pattern</code></font></td>
<td><b><a href="bison-module.html#reSpaces"><code>reSpaces</code></a></b> = <span title="&lt;_sre.SRE_Pattern object at 0x4029a2f8&gt;"><code><span class="re"><span class="re-char">\s</span><span class="re-op">+</span></span> </code>
</span></td></tr>
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<!-- =========== START OF FUNCTION DETAILS =========== -->
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<th colspan="2">Function Details</th></tr>
</table>
<a name="bisonToPython"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
<h3><span class="sig"><span class="sig-name">bisonToPython</span>(<span class=sig-arg>bisonfileName</span>,
<span class=sig-arg>lexfileName</span>,
<span class=sig-arg>pyfileName</span>,
<span class=sig-arg>generateClasses</span>=<span class=sig-default>0</span>)</span>
</h3>
<p>Rips the rules, tokens and precedences from a bison file, and the
verbatim text from a lex file and generates a boilerplate python file
containing a Parser class with handler methods and grammar
attributes</p>
Arguments:
<ul>
<li>
bisonfileName - name of input bison script
</li>
<li>
lexfileName - name of input flex script
</li>
<li>
pyfileName - name of output python file
</li>
<li>
generateClasses - flag - default 0 - if 1, causes a unique class
to be defined for each parse target, and for the corresponding
target handler method in the main Parser class to use this class
when creating the node.
</li>
</ul>
<dl><dt></dt><dd>
</dd></dl>
</td></tr></table>
<br />
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<th colspan="2">Variable Details</th></tr>
</table>
<table width="100%" class="var-details" bgcolor="#e0e0e0"><tr><td>
<a name="reSpaces"></a>
<h3>reSpaces</h3>
<dl>
<dt></dt>
<dd>
<dl>
<dt><b>Type:</b></dt>
<dd>
<code>SRE_Pattern</code>
</dd>
<span title="&lt;_sre.SRE_Pattern object at 0x4029a2f8&gt;"> <dt><b>Value:</b></dt>
<dd><table><tr><td>
<pre class="variable">
<span class="re"><span class="re-char">\s</span><span class="re-op">+</span></span> </pre>
</td></tr></table></dd>
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<a href="bison-module.html">Module&nbsp;bison</a> ::
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<!-- =========== START OF CLASS DESCRIPTION =========== -->
<h2 class="class">Class BisonError</h2>
<hr/>
<p>Flags an error to yyparse()</p>
You should return this in your actions to notify a syntax error
<hr/>
<!-- =========== START OF METHOD SUMMARY =========== -->
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<tr bgcolor="#70b0f0" class="summary">
<th colspan="2">Method Summary</th></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
<td><code><a name="__init__"></a><span class="summary-sig"><span class="summary-sig-name">__init__</span>(<span class=summary-sig-arg>self</span>,
<span class=summary-sig-arg>value</span>)</span></code>
</td></tr>
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<!-- =========== START OF CLASS VARIABLE SUMMARY =========== -->
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<th colspan="2">Class Variable Summary</th></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"><code>int</code></font></td>
<td><b><a href="../private/bison.BisonError-class.html#_pyBisonError"><code>_pyBisonError</code></a></b> = <span title="1">1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>
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<th colspan="2">Class Variable Details</th></tr>
</table>
<table width="100%" class="var-details" bgcolor="#e0e0e0"><tr><td>
<a name="_pyBisonError"></a>
<h3>_pyBisonError</h3>
<dl>
<dt></dt>
<dd>
<dl>
<dt><b>Type:</b></dt>
<dd>
<code>int</code>
</dd>
<span title="1"> <dt><b>Value:</b></dt>
<dd><table><tr><td>
<pre class="variable">
1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</pre>
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<h2 class="class">Class ParserSyntaxError</h2>
<pre class="base-tree">
<a href="exceptions.Exception-class.html"><code>Exception</code></a> --+
|
<b>ParserSyntaxError</b>
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<h2 class="class">Class Exception</h2>
<dl><dt><b>Known Subclasses:</b></dt>
<dd>
<a href="bison.ParserSyntaxError-class.html"><code>ParserSyntaxError</code></a></dd></dl>
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Common base class for all exceptions.
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<a target="moduleFrame" href="toc-bison-module.html">bison</a><br />
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<!-- =========== START OF MODULE HIERARCHY =========== -->
<h2>Module Hierarchy</h2>
<ul>
<li> <b><a href="bison-module.html"><code>bison</code></a></b>: <i>Wrapper module for interfacing with Bison (yacc)</i>
</ul>
<!-- =========== START OF CLASS HIERARCHY =========== -->
<h2>Class Hierarchy</h2>
<ul>
<li> <b><a href="__builtin__.object-class.html"><code>__builtin__.object</code></a></b>: <i>
The most base type</i>
<ul>
<li> <b><a href="bison.BisonParser-class.html"><code>bison.BisonParser</code></a></b>: <i>
Base parser class</i>
<li> <b><a href="__builtin__.type-class.html"><code>__builtin__.type</code></a></b>: <i>
type(object) -&gt; the object's type type(name, bases, dict) -&gt; a
new type</i>
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<li> <b><a href="bison.BisonError-class.html"><code>bison.BisonError</code></a></b>: <i>
Flags an error to yyparse()</i>
<li> <b><a href="bison.BisonNode-class.html"><code>bison.BisonNode</code></a></b>: <i>
Generic class for wrapping parse targets.</i>
<li> <b><a href="exceptions.Exception-class.html"><code>exceptions.Exception</code></a></b>: <i>
Common base class for all exceptions.</i>
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<li> <b><a href="bison.ParserSyntaxError-class.html"><code>bison.ParserSyntaxError</code></a></b>
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<!-- =========== START OF CLASS DESCRIPTION =========== -->
<h2 class="class">Class BisonError</h2>
<hr/>
<p>Flags an error to yyparse()</p>
You should return this in your actions to notify a syntax error
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<td><code><a name="__init__"></a><span class="summary-sig"><span class="summary-sig-name">__init__</span>(<span class=summary-sig-arg>self</span>,
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This is a minimal calculator example, as discussed in the walkthrough
document.
Provided you have installed PyBison, running the run.py script should
trigger the creation of the calc-parser.so parser engine lib, and
run a calculator parser which accepts expressions you type in, and
prints out results.
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