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ply: update PLY to version 3.2

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Nathan Binkert 2009-08-16 13:39:58 -07:00
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19
ext/ply/ANNOUNCE
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@ -1,12 +1,13 @@
February 19, 2007
March 24, 2009
Announcing : PLY-2.3 (Python Lex-Yacc)
Announcing : PLY-3.2 (Python Lex-Yacc)
http://www.dabeaz.com/ply
I'm pleased to announce a significant new update to PLY---a 100% Python
implementation of the common parsing tools lex and yacc. PLY-2.3 is
a minor bug fix release, but also features improved performance.
implementation of the common parsing tools lex and yacc. PLY-3.2 adds
compatibility for Python 2.6 and 3.0, provides some new customization
options, and cleans up a lot of internal implementation details.
If you are new to PLY, here are a few highlights:
@ -29,19 +30,11 @@ If you are new to PLY, here are a few highlights:
problems. Currently, PLY can build its parsing tables using
either SLR or LALR(1) algorithms.
- PLY can be used to build parsers for large programming languages.
Although it is not ultra-fast due to its Python implementation,
PLY can be used to parse grammars consisting of several hundred
rules (as might be found for a language like C). The lexer and LR
parser are also reasonably efficient when parsing normal
sized programs.
More information about PLY can be obtained on the PLY webpage at:
http://www.dabeaz.com/ply
PLY is freely available and is licensed under the terms of the Lesser
GNU Public License (LGPL).
PLY is freely available.
Cheers,

332
ext/ply/CHANGES
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Version 3.2
-----------------------------
03/24/09: beazley
Added an extra check to not print duplicated warning messages
about reduce/reduce conflicts.
03/24/09: beazley
Switched PLY over to a BSD-license.
03/23/09: beazley
Performance optimization. Discovered a few places to make
speedups in LR table generation.
03/23/09: beazley
New warning message. PLY now warns about rules never
reduced due to reduce/reduce conflicts. Suggested by
Bruce Frederiksen.
03/23/09: beazley
Some clean-up of warning messages related to reduce/reduce errors.
03/23/09: beazley
Added a new picklefile option to yacc() to write the parsing
tables to a filename using the pickle module. Here is how
it works:
yacc(picklefile="parsetab.p")
This option can be used if the normal parsetab.py file is
extremely large. For example, on jython, it is impossible
to read parsing tables if the parsetab.py exceeds a certain
threshold.
The filename supplied to the picklefile option is opened
relative to the current working directory of the Python
interpreter. If you need to refer to the file elsewhere,
you will need to supply an absolute or relative path.
For maximum portability, the pickle file is written
using protocol 0.
03/13/09: beazley
Fixed a bug in parser.out generation where the rule numbers
where off by one.
03/13/09: beazley
Fixed a string formatting bug with one of the error messages.
Reported by Richard Reitmeyer
Version 3.1
-----------------------------
02/28/09: beazley
Fixed broken start argument to yacc(). PLY-3.0 broke this
feature by accident.
02/28/09: beazley
Fixed debugging output. yacc() no longer reports shift/reduce
or reduce/reduce conflicts if debugging is turned off. This
restores similar behavior in PLY-2.5. Reported by Andrew Waters.
Version 3.0
-----------------------------
02/03/09: beazley
Fixed missing lexer attribute on certain tokens when
invoking the parser p_error() function. Reported by
Bart Whiteley.
02/02/09: beazley
The lex() command now does all error-reporting and diagonistics
using the logging module interface. Pass in a Logger object
using the errorlog parameter to specify a different logger.
02/02/09: beazley
Refactored ply.lex to use a more object-oriented and organized
approach to collecting lexer information.
02/01/09: beazley
Removed the nowarn option from lex(). All output is controlled
by passing in a logger object. Just pass in a logger with a high
level setting to suppress output. This argument was never
documented to begin with so hopefully no one was relying upon it.
02/01/09: beazley
Discovered and removed a dead if-statement in the lexer. This
resulted in a 6-7% speedup in lexing when I tested it.
01/13/09: beazley
Minor change to the procedure for signalling a syntax error in a
production rule. A normal SyntaxError exception should be raised
instead of yacc.SyntaxError.
01/13/09: beazley
Added a new method p.set_lineno(n,lineno) that can be used to set the
line number of symbol n in grammar rules. This simplifies manual
tracking of line numbers.
01/11/09: beazley
Vastly improved debugging support for yacc.parse(). Instead of passing
debug as an integer, you can supply a Logging object (see the logging
module). Messages will be generated at the ERROR, INFO, and DEBUG
logging levels, each level providing progressively more information.
The debugging trace also shows states, grammar rule, values passed
into grammar rules, and the result of each reduction.
01/09/09: beazley
The yacc() command now does all error-reporting and diagnostics using
the interface of the logging module. Use the errorlog parameter to
specify a logging object for error messages. Use the debuglog parameter
to specify a logging object for the 'parser.out' output.
01/09/09: beazley
*HUGE* refactoring of the the ply.yacc() implementation. The high-level
user interface is backwards compatible, but the internals are completely
reorganized into classes. No more global variables. The internals
are also more extensible. For example, you can use the classes to
construct a LALR(1) parser in an entirely different manner than
what is currently the case. Documentation is forthcoming.
01/07/09: beazley
Various cleanup and refactoring of yacc internals.
01/06/09: beazley
Fixed a bug with precedence assignment. yacc was assigning the precedence
each rule based on the left-most token, when in fact, it should have been
using the right-most token. Reported by Bruce Frederiksen.
11/27/08: beazley
Numerous changes to support Python 3.0 including removal of deprecated
statements (e.g., has_key) and the additional of compatibility code
to emulate features from Python 2 that have been removed, but which
are needed. Fixed the unit testing suite to work with Python 3.0.
The code should be backwards compatible with Python 2.
11/26/08: beazley
Loosened the rules on what kind of objects can be passed in as the
"module" parameter to lex() and yacc(). Previously, you could only use
a module or an instance. Now, PLY just uses dir() to get a list of
symbols on whatever the object is without regard for its type.
11/26/08: beazley
Changed all except: statements to be compatible with Python2.x/3.x syntax.
11/26/08: beazley
Changed all raise Exception, value statements to raise Exception(value) for
forward compatibility.
11/26/08: beazley
Removed all print statements from lex and yacc, using sys.stdout and sys.stderr
directly. Preparation for Python 3.0 support.
11/04/08: beazley
Fixed a bug with referring to symbols on the the parsing stack using negative
indices.
05/29/08: beazley
Completely revamped the testing system to use the unittest module for everything.
Added additional tests to cover new errors/warnings.
Version 2.5
-----------------------------
05/28/08: beazley
Fixed a bug with writing lex-tables in optimized mode and start states.
Reported by Kevin Henry.
Version 2.4
-----------------------------
05/04/08: beazley
A version number is now embedded in the table file signature so that
yacc can more gracefully accomodate changes to the output format
in the future.
05/04/08: beazley
Removed undocumented .pushback() method on grammar productions. I'm
not sure this ever worked and can't recall ever using it. Might have
been an abandoned idea that never really got fleshed out. This
feature was never described or tested so removing it is hopefully
harmless.
05/04/08: beazley
Added extra error checking to yacc() to detect precedence rules defined
for undefined terminal symbols. This allows yacc() to detect a potential
problem that can be really tricky to debug if no warning message or error
message is generated about it.
05/04/08: beazley
lex() now has an outputdir that can specify the output directory for
tables when running in optimize mode. For example:
lexer = lex.lex(optimize=True, lextab="ltab", outputdir="foo/bar")
The behavior of specifying a table module and output directory are
more aligned with the behavior of yacc().
05/04/08: beazley
[Issue 9]
Fixed filename bug in when specifying the modulename in lex() and yacc().
If you specified options such as the following:
parser = yacc.yacc(tabmodule="foo.bar.parsetab",outputdir="foo/bar")
yacc would create a file "foo.bar.parsetab.py" in the given directory.
Now, it simply generates a file "parsetab.py" in that directory.
Bug reported by cptbinho.
05/04/08: beazley
Slight modification to lex() and yacc() to allow their table files
to be loaded from a previously loaded module. This might make
it easier to load the parsing tables from a complicated package
structure. For example:
import foo.bar.spam.parsetab as parsetab
parser = yacc.yacc(tabmodule=parsetab)
Note: lex and yacc will never regenerate the table file if used
in the form---you will get a warning message instead.
This idea suggested by Brian Clapper.
04/28/08: beazley
Fixed a big with p_error() functions being picked up correctly
when running in yacc(optimize=1) mode. Patch contributed by
Bart Whiteley.
02/28/08: beazley
Fixed a bug with 'nonassoc' precedence rules. Basically the
non-precedence was being ignored and not producing the correct
run-time behavior in the parser.
02/16/08: beazley
Slight relaxation of what the input() method to a lexer will
accept as a string. Instead of testing the input to see
if the input is a string or unicode string, it checks to see
if the input object looks like it contains string data.
This change makes it possible to pass string-like objects
in as input. For example, the object returned by mmap.
import mmap, os
data = mmap.mmap(os.open(filename,os.O_RDONLY),
os.path.getsize(filename),
access=mmap.ACCESS_READ)
lexer.input(data)
11/29/07: beazley
Modification of ply.lex to allow token functions to aliased.
This is subtle, but it makes it easier to create libraries and
to reuse token specifications. For example, suppose you defined
a function like this:
def number(t):
r'\d+'
t.value = int(t.value)
return t
This change would allow you to define a token rule as follows:
t_NUMBER = number
In this case, the token type will be set to 'NUMBER' and use
the associated number() function to process tokens.
11/28/07: beazley
Slight modification to lex and yacc to grab symbols from both
the local and global dictionaries of the caller. This
modification allows lexers and parsers to be defined using
inner functions and closures.
11/28/07: beazley
Performance optimization: The lexer.lexmatch and t.lexer
attributes are no longer set for lexer tokens that are not
defined by functions. The only normal use of these attributes
would be in lexer rules that need to perform some kind of
special processing. Thus, it doesn't make any sense to set
them on every token.
*** POTENTIAL INCOMPATIBILITY *** This might break code
that is mucking around with internal lexer state in some
sort of magical way.
11/27/07: beazley
Added the ability to put the parser into error-handling mode
from within a normal production. To do this, simply raise
a yacc.SyntaxError exception like this:
def p_some_production(p):
'some_production : prod1 prod2'
...
raise yacc.SyntaxError # Signal an error
A number of things happen after this occurs:
- The last symbol shifted onto the symbol stack is discarded
and parser state backed up to what it was before the
the rule reduction.
- The current lookahead symbol is saved and replaced by
the 'error' symbol.
- The parser enters error recovery mode where it tries
to either reduce the 'error' rule or it starts
discarding items off of the stack until the parser
resets.
When an error is manually set, the parser does *not* call
the p_error() function (if any is defined).
*** NEW FEATURE *** Suggested on the mailing list
11/27/07: beazley
Fixed structure bug in examples/ansic. Reported by Dion Blazakis.
11/27/07: beazley
Fixed a bug in the lexer related to start conditions and ignored
token rules. If a rule was defined that changed state, but
returned no token, the lexer could be left in an inconsistent
state. Reported by
11/27/07: beazley
Modified setup.py to support Python Eggs. Patch contributed by
Simon Cross.
11/09/07: beazely
Fixed a bug in error handling in yacc. If a syntax error occurred and the
parser rolled the entire parse stack back, the parser would be left in in
inconsistent state that would cause it to trigger incorrect actions on
subsequent input. Reported by Ton Biegstraaten, Justin King, and others.
11/09/07: beazley
Fixed a bug when passing empty input strings to yacc.parse(). This
would result in an error message about "No input given". Reported
by Andrew Dalke.
Version 2.3
-----------------------------
02/20/07: beazley

504
ext/ply/COPYING
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@ -1,504 +0,0 @@
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That's all there is to it!

101
ext/ply/README
View file

@ -1,33 +1,41 @@
PLY (Python Lex-Yacc) Version 2.3 (February 18, 2007)
PLY (Python Lex-Yacc) Version 3.2
David M. Beazley (dave@dabeaz.com)
Copyright (C) 2001-2009,
David M. Beazley (Dabeaz LLC)
All rights reserved.
Copyright (C) 2001-2007 David M. Beazley
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the David Beazley or Dabeaz LLC may be used to
endorse or promote products derived from this software without
specific prior written permission.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
See the file COPYING for a complete copy of the LGPL.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Introduction
============
PLY is a 100% Python implementation of the common parsing tools lex
and yacc. Although several other parsing tools are available for
Python, there are several reasons why you might want to consider PLY:
and yacc. Here are a few highlights:
- The tools are very closely modeled after traditional lex/yacc.
- PLY is very closely modeled after traditional lex/yacc.
If you know how to use these tools in C, you will find PLY
to be similar.
@ -43,8 +51,8 @@ Python, there are several reasons why you might want to consider PLY:
- Parsing is based on LR-parsing which is fast, memory efficient,
better suited to large grammars, and which has a number of nice
properties when dealing with syntax errors and other parsing problems.
Currently, PLY builds its parsing tables using the SLR algorithm which
is slightly weaker than LALR(1) used in traditional yacc.
Currently, PLY builds its parsing tables using the LALR(1)
algorithm used in yacc.
- PLY uses Python introspection features to build lexers and parsers.
This greatly simplifies the task of parser construction since it reduces
@ -56,16 +64,8 @@ Python, there are several reasons why you might want to consider PLY:
PLY can be used to parse grammars consisting of several hundred
rules (as might be found for a language like C). The lexer and LR
parser are also reasonably efficient when parsing typically
sized programs.
The original version of PLY was developed for an Introduction to
Compilers course where students used it to build a compiler for a
simple Pascal-like language. Their compiler had to include lexical
analysis, parsing, type checking, type inference, and generation of
assembly code for the SPARC processor. Because of this, the current
implementation has been extensively tested and debugged. In addition,
most of the API and error checking steps have been adapted to address
common usability problems.
sized programs. People have used PLY to build parsers for
C, C++, ADA, and other real programming languages.
How to Use
==========
@ -96,10 +96,10 @@ A simple example is found at the end of this document
Requirements
============
PLY requires the use of Python 2.1 or greater. However, you should
PLY requires the use of Python 2.2 or greater. However, you should
use the latest Python release if possible. It should work on just
about any platform. PLY has been tested with both CPython and Jython.
However, it does not seem to work with IronPython.
It also seems to work with IronPython.
Resources
=========
@ -127,16 +127,13 @@ Elias Ioup did the first implementation of LALR(1) parsing in PLY-1.x.
Andrew Waters and Markus Schoepflin were instrumental in reporting bugs
and testing a revised LALR(1) implementation for PLY-2.0.
Special Note for PLY-2.x
Special Note for PLY-3.0
========================
PLY-2.0 is the first in a series of PLY releases that will be adding a
variety of significant new features. The first release in this series
(Ply-2.0) should be 100% compatible with all previous Ply-1.x releases
except for the fact that Ply-2.0 features a correct implementation of
LALR(1) table generation.
If you have suggestions for improving PLY in future 2.x releases, please
contact me. - Dave
PLY-3.0 the first PLY release to support Python 3. However, backwards
compatibility with Python 2.2 is still preserved. PLY provides dual
Python 2/3 compatibility by restricting its implementation to a common
subset of basic language features. You should not convert PLY using
2to3--it is not necessary and may in fact break the implementation.
Example
=======
@ -169,11 +166,7 @@ t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print "Integer value too large", t.value
t.value = 0
t.value = int(t.value)
return t
# Ignored characters
@ -255,12 +248,12 @@ while 1:
Bug Reports and Patches
=======================
Because of the extremely specialized and advanced nature of PLY, I
rarely spend much time working on it unless I receive very specific
bug-reports and/or patches to fix problems. I also try to incorporate
submitted feature requests and enhancements into each new version. To
contact me about bugs and/or new features, please send email to
dave@dabeaz.com.
My goal with PLY is to simply have a decent lex/yacc implementation
for Python. As a general rule, I don't spend huge amounts of time
working on it unless I receive very specific bug reports and/or
patches to fix problems. I also try to incorporate submitted feature
requests and enhancements into each new version. To contact me about
bugs and/or new features, please send email to dave@dabeaz.com.
In addition there is a Google group for discussing PLY related issues at

16
ext/ply/TODO
View file

@ -1,14 +1,16 @@
The PLY to-do list:
1. More interesting parsing examples.
1. Finish writing the C Preprocessor module. Started in the
file ply/cpp.py
2. Work on the ANSI C grammar so that it can actually parse C programs. To do this,
some extra code needs to be added to the lexer to deal with typedef names and enumeration
constants.
2. Create and document libraries of useful tokens.
3. More tests in the test directory.
3. Expand the examples/yply tool that parses bison/yacc
files.
4. Performance improvements and cleanup in yacc.py.
4. Think of various diabolical things to do with the
new yacc internals. For example, it is now possible
to specify grammrs using completely different schemes
than the reflection approach used by PLY.
5. More documentation (?).

874
ext/ply/doc/internal.html Normal file
View file

@ -0,0 +1,874 @@
<html>
<head>
<title>PLY Internals</title>
</head>
<body bgcolor="#ffffff">
<h1>PLY Internals</h1>
<b>
David M. Beazley <br>
dave@dabeaz.com<br>
</b>
<p>
<b>PLY Version: 3.0</b>
<p>
<!-- INDEX -->
<div class="sectiontoc">
<ul>
<li><a href="#internal_nn1">Introduction</a>
<li><a href="#internal_nn2">Grammar Class</a>
<li><a href="#internal_nn3">Productions</a>
<li><a href="#internal_nn4">LRItems</a>
<li><a href="#internal_nn5">LRTable</a>
<li><a href="#internal_nn6">LRGeneratedTable</a>
<li><a href="#internal_nn7">LRParser</a>
<li><a href="#internal_nn8">ParserReflect</a>
<li><a href="#internal_nn9">High-level operation</a>
</ul>
</div>
<!-- INDEX -->
<H2><a name="internal_nn1"></a>1. Introduction</H2>
This document describes classes and functions that make up the internal
operation of PLY. Using this programming interface, it is possible to
manually build an parser using a different interface specification
than what PLY normally uses. For example, you could build a gramar
from information parsed in a completely different input format. Some of
these objects may be useful for building more advanced parsing engines
such as GLR.
<p>
It should be stressed that using PLY at this level is not for the
faint of heart. Generally, it's assumed that you know a bit of
the underlying compiler theory and how an LR parser is put together.
<H2><a name="internal_nn2"></a>2. Grammar Class</H2>
The file <tt>ply.yacc</tt> defines a class <tt>Grammar</tt> that
is used to hold and manipulate information about a grammar
specification. It encapsulates the same basic information
about a grammar that is put into a YACC file including
the list of tokens, precedence rules, and grammar rules.
Various operations are provided to perform different validations
on the grammar. In addition, there are operations to compute
the first and follow sets that are needed by the various table
generation algorithms.
<p>
<tt><b>Grammar(terminals)</b></tt>
<blockquote>
Creates a new grammar object. <tt>terminals</tt> is a list of strings
specifying the terminals for the grammar. An instance <tt>g</tt> of
<tt>Grammar</tt> has the following methods:
</blockquote>
<p>
<b><tt>g.set_precedence(term,assoc,level)</tt></b>
<blockquote>
Sets the precedence level and associativity for a given terminal <tt>term</tt>.
<tt>assoc</tt> is one of <tt>'right'</tt>,
<tt>'left'</tt>, or <tt>'nonassoc'</tt> and <tt>level</tt> is a positive integer. The higher
the value of <tt>level</tt>, the higher the precedence. Here is an example of typical
precedence settings:
<pre>
g.set_precedence('PLUS', 'left',1)
g.set_precedence('MINUS', 'left',1)
g.set_precedence('TIMES', 'left',2)
g.set_precedence('DIVIDE','left',2)
g.set_precedence('UMINUS','left',3)
</pre>
This method must be called prior to adding any productions to the
grammar with <tt>g.add_production()</tt>. The precedence of individual grammar
rules is determined by the precedence of the right-most terminal.
</blockquote>
<p>
<b><tt>g.add_production(name,syms,func=None,file='',line=0)</tt></b>
<blockquote>
Adds a new grammar rule. <tt>name</tt> is the name of the rule,
<tt>syms</tt> is a list of symbols making up the right hand
side of the rule, <tt>func</tt> is the function to call when
reducing the rule. <tt>file</tt> and <tt>line</tt> specify
the filename and line number of the rule and are used for
generating error messages.
<p>
The list of symbols in <tt>syms</tt> may include character
literals and <tt>%prec</tt> specifiers. Here are some
examples:
<pre>
g.add_production('expr',['expr','PLUS','term'],func,file,line)
g.add_production('expr',['expr','"+"','term'],func,file,line)
g.add_production('expr',['MINUS','expr','%prec','UMINUS'],func,file,line)
</pre>
<p>
If any kind of error is detected, a <tt>GrammarError</tt> exception
is raised with a message indicating the reason for the failure.
</blockquote>
<p>
<b><tt>g.set_start(start=None)</tt></b>
<blockquote>
Sets the starting rule for the grammar. <tt>start</tt> is a string
specifying the name of the start rule. If <tt>start</tt> is omitted,
the first grammar rule added with <tt>add_production()</tt> is taken to be
the starting rule. This method must always be called after all
productions have been added.
</blockquote>
<p>
<b><tt>g.find_unreachable()</tt></b>
<blockquote>
Diagnostic function. Returns a list of all unreachable non-terminals
defined in the grammar. This is used to identify inactive parts of
the grammar specification.
</blockquote>
<p>
<b><tt>g.infinite_cycle()</tt></b>
<blockquote>
Diagnostic function. Returns a list of all non-terminals in the
grammar that result in an infinite cycle. This condition occurs if
there is no way for a grammar rule to expand to a string containing
only terminal symbols.
</blockquote>
<p>
<b><tt>g.undefined_symbols()</tt></b>
<blockquote>
Diagnostic function. Returns a list of tuples <tt>(name, prod)</tt>
corresponding to undefined symbols in the grammar. <tt>name</tt> is the
name of the undefined symbol and <tt>prod</tt> is an instance of
<tt>Production</tt> which has information about the production rule
where the undefined symbol was used.
</blockquote>
<p>
<b><tt>g.unused_terminals()</tt></b>
<blockquote>
Diagnostic function. Returns a list of terminals that were defined,
but never used in the grammar.
</blockquote>
<p>
<b><tt>g.unused_rules()</tt></b>
<blockquote>
Diagnostic function. Returns a list of <tt>Production</tt> instances
corresponding to production rules that were defined in the grammar,
but never used anywhere. This is slightly different
than <tt>find_unreachable()</tt>.
</blockquote>
<p>
<b><tt>g.unused_precedence()</tt></b>
<blockquote>
Diagnostic function. Returns a list of tuples <tt>(term, assoc)</tt>
corresponding to precedence rules that were set, but never used the
grammar. <tt>term</tt> is the terminal name and <tt>assoc</tt> is the
precedence associativity (e.g., <tt>'left'</tt>, <tt>'right'</tt>,
or <tt>'nonassoc'</tt>.
</blockquote>
<p>
<b><tt>g.compute_first()</tt></b>
<blockquote>
Compute all of the first sets for all symbols in the grammar. Returns a dictionary
mapping symbol names to a list of all first symbols.
</blockquote>
<p>
<b><tt>g.compute_follow()</tt></b>
<blockquote>
Compute all of the follow sets for all non-terminals in the grammar.
The follow set is the set of all possible symbols that might follow a
given non-terminal. Returns a dictionary mapping non-terminal names
to a list of symbols.
</blockquote>
<p>
<b><tt>g.build_lritems()</tt></b>
<blockquote>
Calculates all of the LR items for all productions in the grammar. This
step is required before using the grammar for any kind of table generation.
See the section on LR items below.
</blockquote>
<p>
The following attributes are set by the above methods and may be useful
in code that works with the grammar. All of these attributes should be
assumed to be read-only. Changing their values directly will likely
break the grammar.
<p>
<b><tt>g.Productions</tt></b>
<blockquote>
A list of all productions added. The first entry is reserved for
a production representing the starting rule. The objects in this list
are instances of the <tt>Production</tt> class, described shortly.
</blockquote>
<p>
<b><tt>g.Prodnames</tt></b>
<blockquote>
A dictionary mapping the names of nonterminals to a list of all
productions of that nonterminal.
</blockquote>
<p>
<b><tt>g.Terminals</tt></b>
<blockquote>
A dictionary mapping the names of terminals to a list of the
production numbers where they are used.
</blockquote>
<p>
<b><tt>g.Nonterminals</tt></b>
<blockquote>
A dictionary mapping the names of nonterminals to a list of the
production numbers where they are used.
</blockquote>
<p>
<b><tt>g.First</tt></b>
<blockquote>
A dictionary representing the first sets for all grammar symbols. This is
computed and returned by the <tt>compute_first()</tt> method.
</blockquote>
<p>
<b><tt>g.Follow</tt></b>
<blockquote>
A dictionary representing the follow sets for all grammar rules. This is
computed and returned by the <tt>compute_follow()</tt> method.
</blockquote>
<p>
<b><tt>g.Start</tt></b>
<blockquote>
Starting symbol for the grammar. Set by the <tt>set_start()</tt> method.
</blockquote>
For the purposes of debugging, a <tt>Grammar</tt> object supports the <tt>__len__()</tt> and
<tt>__getitem__()</tt> special methods. Accessing <tt>g[n]</tt> returns the nth production
from the grammar.
<H2><a name="internal_nn3"></a>3. Productions</H2>
<tt>Grammar</tt> objects store grammar rules as instances of a <tt>Production</tt> class. This
class has no public constructor--you should only create productions by calling <tt>Grammar.add_production()</tt>.
The following attributes are available on a <tt>Production</tt> instance <tt>p</tt>.
<p>
<b><tt>p.name</tt></b>
<blockquote>
The name of the production. For a grammar rule such as <tt>A : B C D</tt>, this is <tt>'A'</tt>.
</blockquote>
<p>
<b><tt>p.prod</tt></b>
<blockquote>
A tuple of symbols making up the right-hand side of the production. For a grammar rule such as <tt>A : B C D</tt>, this is <tt>('B','C','D')</tt>.
</blockquote>
<p>
<b><tt>p.number</tt></b>
<blockquote>
Production number. An integer containing the index of the production in the grammar's <tt>Productions</tt> list.
</blockquote>
<p>
<b><tt>p.func</tt></b>
<blockquote>
The name of the reduction function associated with the production.
This is the function that will execute when reducing the entire
grammar rule during parsing.
</blockquote>
<p>
<b><tt>p.callable</tt></b>
<blockquote>
The callable object associated with the name in <tt>p.func</tt>. This is <tt>None</tt>
unless the production has been bound using <tt>bind()</tt>.
</blockquote>
<p>
<b><tt>p.file</tt></b>
<blockquote>
Filename associated with the production. Typically this is the file where the production was defined. Used for error messages.
</blockquote>
<p>
<b><tt>p.lineno</tt></b>
<blockquote>
Line number associated with the production. Typically this is the line number in <tt>p.file</tt> where the production was defined. Used for error messages.
</blockquote>
<p>
<b><tt>p.prec</tt></b>
<blockquote>
Precedence and associativity associated with the production. This is a tuple <tt>(assoc,level)</tt> where
<tt>assoc</tt> is one of <tt>'left'</tt>,<tt>'right'</tt>, or <tt>'nonassoc'</tt> and <tt>level</tt> is
an integer. This value is determined by the precedence of the right-most terminal symbol in the production
or by use of the <tt>%prec</tt> specifier when adding the production.
</blockquote>
<p>
<b><tt>p.usyms</tt></b>
<blockquote>
A list of all unique symbols found in the production.
</blockquote>
<p>
<b><tt>p.lr_items</tt></b>
<blockquote>
A list of all LR items for this production. This attribute only has a meaningful value if the
<tt>Grammar.build_lritems()</tt> method has been called. The items in this list are
instances of <tt>LRItem</tt> described below.
</blockquote>
<p>
<b><tt>p.lr_next</tt></b>
<blockquote>
The head of a linked-list representation of the LR items in <tt>p.lr_items</tt>.
This attribute only has a meaningful value if the <tt>Grammar.build_lritems()</tt>
method has been called. Each <tt>LRItem</tt> instance has a <tt>lr_next</tt> attribute
to move to the next item. The list is terminated by <tt>None</tt>.
</blockquote>
<p>
<b><tt>p.bind(dict)</tt></b>
<blockquote>
Binds the production function name in <tt>p.func</tt> to a callable object in
<tt>dict</tt>. This operation is typically carried out in the last step
prior to running the parsing engine and is needed since parsing tables are typically
read from files which only include the function names, not the functions themselves.
</blockquote>
<P>
<tt>Production</tt> objects support
the <tt>__len__()</tt>, <tt>__getitem__()</tt>, and <tt>__str__()</tt>
special methods.
<tt>len(p)</tt> returns the number of symbols in <tt>p.prod</tt>
and <tt>p[n]</tt> is the same as <tt>p.prod[n]</tt>.
<H2><a name="internal_nn4"></a>4. LRItems</H2>
The construction of parsing tables in an LR-based parser generator is primarily
done over a set of "LR Items". An LR item represents a stage of parsing one
of the grammar rules. To compute the LR items, it is first necessary to
call <tt>Grammar.build_lritems()</tt>. Once this step, all of the productions
in the grammar will have their LR items attached to them.
<p>
Here is an interactive example that shows what LR items look like if you
interactively experiment. In this example, <tt>g</tt> is a <tt>Grammar</tt>
object.
<blockquote>
<pre>
>>> <b>g.build_lritems()</b>
>>> <b>p = g[1]</b>
>>> <b>p</b>
Production(statement -> ID = expr)
>>>
</pre>
</blockquote>
In the above code, <tt>p</tt> represents the first grammar rule. In
this case, a rule <tt>'statement -> ID = expr'</tt>.
<p>
Now, let's look at the LR items for <tt>p</tt>.
<blockquote>
<pre>
>>> <b>p.lr_items</b>
[LRItem(statement -> . ID = expr),
LRItem(statement -> ID . = expr),
LRItem(statement -> ID = . expr),
LRItem(statement -> ID = expr .)]
>>>
</pre>
</blockquote>
In each LR item, the dot (.) represents a specific stage of parsing. In each LR item, the dot
is advanced by one symbol. It is only when the dot reaches the very end that a production
is successfully parsed.
<p>
An instance <tt>lr</tt> of <tt>LRItem</tt> has the following
attributes that hold information related to that specific stage of
parsing.
<p>
<b><tt>lr.name</tt></b>
<blockquote>
The name of the grammar rule. For example, <tt>'statement'</tt> in the above example.
</blockquote>
<p>
<b><tt>lr.prod</tt></b>
<blockquote>
A tuple of symbols representing the right-hand side of the production, including the
special <tt>'.'</tt> character. For example, <tt>('ID','.','=','expr')</tt>.
</blockquote>
<p>
<b><tt>lr.number</tt></b>
<blockquote>
An integer representing the production number in the grammar.
</blockquote>
<p>
<b><tt>lr.usyms</tt></b>
<blockquote>
A set of unique symbols in the production. Inherited from the original <tt>Production</tt> instance.
</blockquote>
<p>
<b><tt>lr.lr_index</tt></b>
<blockquote>
An integer representing the position of the dot (.). You should never use <tt>lr.prod.index()</tt>
to search for it--the result will be wrong if the grammar happens to also use (.) as a character
literal.
</blockquote>
<p>
<b><tt>lr.lr_after</tt></b>
<blockquote>
A list of all productions that can legally appear immediately to the right of the
dot (.). This list contains <tt>Production</tt> instances. This attribute
represents all of the possible branches a parse can take from the current position.
For example, suppose that <tt>lr</tt> represents a stage immediately before
an expression like this:
<pre>
>>> <b>lr</b>
LRItem(statement -> ID = . expr)
>>>
</pre>
Then, the value of <tt>lr.lr_after</tt> might look like this, showing all productions that
can legally appear next:
<pre>
>>> <b>lr.lr_after</b>
[Production(expr -> expr PLUS expr),
Production(expr -> expr MINUS expr),
Production(expr -> expr TIMES expr),
Production(expr -> expr DIVIDE expr),
Production(expr -> MINUS expr),
Production(expr -> LPAREN expr RPAREN),
Production(expr -> NUMBER),
Production(expr -> ID)]
>>>
</pre>
</blockquote>
<p>
<b><tt>lr.lr_before</tt></b>
<blockquote>
The grammar symbol that appears immediately before the dot (.) or <tt>None</tt> if
at the beginning of the parse.
</blockquote>
<p>
<b><tt>lr.lr_next</tt></b>
<blockquote>
A link to the next LR item, representing the next stage of the parse. <tt>None</tt> if <tt>lr</tt>
is the last LR item.
</blockquote>
<tt>LRItem</tt> instances also support the <tt>__len__()</tt> and <tt>__getitem__()</tt> special methods.
<tt>len(lr)</tt> returns the number of items in <tt>lr.prod</tt> including the dot (.). <tt>lr[n]</tt>
returns <tt>lr.prod[n]</tt>.
<p>
It goes without saying that all of the attributes associated with LR
items should be assumed to be read-only. Modifications will very
likely create a small black-hole that will consume you and your code.
<H2><a name="internal_nn5"></a>5. LRTable</H2>
The <tt>LRTable</tt> class is used to represent LR parsing table data. This
minimally includes the production list, action table, and goto table.
<p>
<b><tt>LRTable()</tt></b>
<blockquote>
Create an empty LRTable object. This object contains only the information needed to
run an LR parser.
</blockquote>
An instance <tt>lrtab</tt> of <tt>LRTable</tt> has the following methods:
<p>
<b><tt>lrtab.read_table(module)</tt></b>
<blockquote>
Populates the LR table with information from the module specified in <tt>module</tt>.
<tt>module</tt> is either a module object already loaded with <tt>import</tt> or
the name of a Python module. If it's a string containing a module name, it is
loaded and parsing data is extracted. Returns the signature value that was used
when initially writing the tables. Raises a <tt>VersionError</tt> exception if
the module was created using an incompatible version of PLY.
</blockquote>
<p>
<b><tt>lrtab.bind_callables(dict)</tt></b>
<blockquote>
This binds all of the function names used in productions to callable objects
found in the dictionary <tt>dict</tt>. During table generation and when reading
LR tables from files, PLY only uses the names of action functions such as <tt>'p_expr'</tt>,
<tt>'p_statement'</tt>, etc. In order to actually run the parser, these names
have to be bound to callable objects. This method is always called prior to
running a parser.
</blockquote>
After <tt>lrtab</tt> has been populated, the following attributes are defined.
<p>
<b><tt>lrtab.lr_method</tt></b>
<blockquote>
The LR parsing method used (e.g., <tt>'LALR'</tt>)
</blockquote>
<p>
<b><tt>lrtab.lr_productions</tt></b>
<blockquote>
The production list. If the parsing tables have been newly
constructed, this will be a list of <tt>Production</tt> instances. If
the parsing tables have been read from a file, it's a list
of <tt>MiniProduction</tt> instances. This, together
with <tt>lr_action</tt> and <tt>lr_goto</tt> contain all of the
information needed by the LR parsing engine.
</blockquote>
<p>
<b><tt>lrtab.lr_action</tt></b>
<blockquote>
The LR action dictionary that implements the underlying state machine.
The keys of this dictionary are the LR states.
</blockquote>
<p>
<b><tt>lrtab.lr_goto</tt></b>
<blockquote>
The LR goto table that contains information about grammar rule reductions.
</blockquote>
<H2><a name="internal_nn6"></a>6. LRGeneratedTable</H2>
The <tt>LRGeneratedTable</tt> class represents constructed LR parsing tables on a
grammar. It is a subclass of <tt>LRTable</tt>.
<p>
<b><tt>LRGeneratedTable(grammar, method='LALR',log=None)</tt></b>
<blockquote>
Create the LR parsing tables on a grammar. <tt>grammar</tt> is an instance of <tt>Grammar</tt>,
<tt>method</tt> is a string with the parsing method (<tt>'SLR'</tt> or <tt>'LALR'</tt>), and
<tt>log</tt> is a logger object used to write debugging information. The debugging information
written to <tt>log</tt> is the same as what appears in the <tt>parser.out</tt> file created
by yacc. By supplying a custom logger with a different message format, it is possible to get
more information (e.g., the line number in <tt>yacc.py</tt> used for issuing each line of
output in the log). The result is an instance of <tt>LRGeneratedTable</tt>.
</blockquote>
<p>
An instance <tt>lr</tt> of <tt>LRGeneratedTable</tt> has the following attributes.
<p>
<b><tt>lr.grammar</tt></b>
<blockquote>
A link to the Grammar object used to construct the parsing tables.
</blockquote>
<p>
<b><tt>lr.lr_method</tt></b>
<blockquote>
The LR parsing method used (e.g., <tt>'LALR'</tt>)
</blockquote>
<p>
<b><tt>lr.lr_productions</tt></b>
<blockquote>
A reference to <tt>grammar.Productions</tt>. This, together with <tt>lr_action</tt> and <tt>lr_goto</tt>
contain all of the information needed by the LR parsing engine.
</blockquote>
<p>
<b><tt>lr.lr_action</tt></b>
<blockquote>
The LR action dictionary that implements the underlying state machine. The keys of this dictionary are
the LR states.
</blockquote>
<p>
<b><tt>lr.lr_goto</tt></b>
<blockquote>
The LR goto table that contains information about grammar rule reductions.
</blockquote>
<p>
<b><tt>lr.sr_conflicts</tt></b>
<blockquote>
A list of tuples <tt>(state,token,resolution)</tt> identifying all shift/reduce conflicts. <tt>state</tt> is the LR state
number where the conflict occurred, <tt>token</tt> is the token causing the conflict, and <tt>resolution</tt> is
a string describing the resolution taken. <tt>resolution</tt> is either <tt>'shift'</tt> or <tt>'reduce'</tt>.
</blockquote>
<p>
<b><tt>lr.rr_conflicts</tt></b>
<blockquote>
A list of tuples <tt>(state,rule,rejected)</tt> identifying all reduce/reduce conflicts. <tt>state</tt> is the
LR state number where the conflict occurred, <tt>rule</tt> is the production rule that was selected
and <tt>rejected</tt> is the production rule that was rejected. Both <tt>rule</tt> and </tt>rejected</tt> are
instances of <tt>Production</tt>. They can be inspected to provide the user with more information.
</blockquote>
<p>
There are two public methods of <tt>LRGeneratedTable</tt>.
<p>
<b><tt>lr.write_table(modulename,outputdir="",signature="")</tt></b>
<blockquote>
Writes the LR parsing table information to a Python module. <tt>modulename</tt> is a string
specifying the name of a module such as <tt>"parsetab"</tt>. <tt>outputdir</tt> is the name of a
directory where the module should be created. <tt>signature</tt> is a string representing a
grammar signature that's written into the output file. This can be used to detect when
the data stored in a module file is out-of-sync with the the grammar specification (and that
the tables need to be regenerated). If <tt>modulename</tt> is a string <tt>"parsetab"</tt>,
this function creates a file called <tt>parsetab.py</tt>. If the module name represents a
package such as <tt>"foo.bar.parsetab"</tt>, then only the last component, <tt>"parsetab"</tt> is
used.
</blockquote>
<H2><a name="internal_nn7"></a>7. LRParser</H2>
The <tt>LRParser</tt> class implements the low-level LR parsing engine.
<p>
<b><tt>LRParser(lrtab, error_func)</tt></b>
<blockquote>
Create an LRParser. <tt>lrtab</tt> is an instance of <tt>LRTable</tt>
containing the LR production and state tables. <tt>error_func</tt> is the
error function to invoke in the event of a parsing error.
</blockquote>
An instance <tt>p</tt> of <tt>LRParser</tt> has the following methods:
<p>
<b><tt>p.parse(input=None,lexer=None,debug=0,tracking=0,tokenfunc=None)</tt></b>
<blockquote>
Run the parser. <tt>input</tt> is a string, which if supplied is fed into the
lexer using its <tt>input()</tt> method. <tt>lexer</tt> is an instance of the
<tt>Lexer</tt> class to use for tokenizing. If not supplied, the last lexer
created with the <tt>lex</tt> module is used. <tt>debug</tt> is a boolean flag
that enables debugging. <tt>tracking</tt> is a boolean flag that tells the
parser to perform additional line number tracking. <tt>tokenfunc</tt> is a callable
function that returns the next token. If supplied, the parser will use it to get
all tokens.
</blockquote>
<p>
<b><tt>p.restart()</tt></b>
<blockquote>
Resets the parser state for a parse already in progress.
</blockquote>
<H2><a name="internal_nn8"></a>8. ParserReflect</H2>
<p>
The <tt>ParserReflect</tt> class is used to collect parser specification data
from a Python module or object. This class is what collects all of the
<tt>p_rule()</tt> functions in a PLY file, performs basic error checking,
and collects all of the needed information to build a grammar. Most of the
high-level PLY interface as used by the <tt>yacc()</tt> function is actually
implemented by this class.
<p>
<b><tt>ParserReflect(pdict, log=None)</tt></b>
<blockquote>
Creates a <tt>ParserReflect</tt> instance. <tt>pdict</tt> is a dictionary
containing parser specification data. This dictionary typically corresponds
to the module or class dictionary of code that implements a PLY parser.
<tt>log</tt> is a logger instance that will be used to report error
messages.
</blockquote>
An instance <tt>p</tt> of <tt>ParserReflect</tt> has the following methods:
<p>
<b><tt>p.get_all()</tt></b>
<blockquote>
Collect and store all required parsing information.
</blockquote>
<p>
<b><tt>p.validate_all()</tt></b>
<blockquote>
Validate all of the collected parsing information. This is a seprate step
from <tt>p.get_all()</tt> as a performance optimization. In order to
increase parser start-up time, a parser can elect to only validate the
parsing data when regenerating the parsing tables. The validation
step tries to collect as much information as possible rather than
raising an exception at the first sign of trouble. The attribute
<tt>p.error</tt> is set if there are any validation errors. The
value of this attribute is also returned.
</blockquote>
<p>
<b><tt>p.signature()</tt></b>
<blockquote>
Compute a signature representing the contents of the collected parsing
data. The signature value should change if anything in the parser
specification has changed in a way that would justify parser table
regeneration. This method can be called after <tt>p.get_all()</tt>,
but before <tt>p.validate_all()</tt>.
</blockquote>
The following attributes are set in the process of collecting data:
<p>
<b><tt>p.start</tt></b>
<blockquote>
The grammar start symbol, if any. Taken from <tt>pdict['start']</tt>.
</blockquote>
<p>
<b><tt>p.error_func</tt></b>
<blockquote>
The error handling function or <tt>None</tt>. Taken from <tt>pdict['p_error']</tt>.
</blockquote>
<p>
<b><tt>p.tokens</tt></b>
<blockquote>
The token list. Taken from <tt>pdict['tokens']</tt>.
</blockquote>
<p>
<b><tt>p.prec</tt></b>
<blockquote>
The precedence specifier. Taken from <tt>pdict['precedence']</tt>.
</blockquote>
<p>
<b><tt>p.preclist</tt></b>
<blockquote>
A parsed version of the precedence specified. A list of tuples of the form
<tt>(token,assoc,level)</tt> where <tt>token</tt> is the terminal symbol,
<tt>assoc</tt> is the associativity (e.g., <tt>'left'</tt>) and <tt>level</tt>
is a numeric precedence level.
</blockquote>
<p>
<b><tt>p.grammar</tt></b>
<blockquote>
A list of tuples <tt>(name, rules)</tt> representing the grammar rules. <tt>name</tt> is the
name of a Python function or method in <tt>pdict</tt> that starts with <tt>"p_"</tt>.
<tt>rules</tt> is a list of tuples <tt>(filename,line,prodname,syms)</tt> representing
the grammar rules found in the documentation string of that function. <tt>filename</tt> and <tt>line</tt> contain location
information that can be used for debugging. <tt>prodname</tt> is the name of the
production. <tt>syms</tt> is the right-hand side of the production. If you have a
function like this
<pre>
def p_expr(p):
'''expr : expr PLUS expr
| expr MINUS expr
| expr TIMES expr
| expr DIVIDE expr'''
</pre>
then the corresponding entry in <tt>p.grammar</tt> might look like this:
<pre>
('p_expr', [ ('calc.py',10,'expr', ['expr','PLUS','expr']),
('calc.py',11,'expr', ['expr','MINUS','expr']),
('calc.py',12,'expr', ['expr','TIMES','expr']),
('calc.py',13,'expr', ['expr','DIVIDE','expr'])
])
</pre>
</blockquote>
<p>
<b><tt>p.pfuncs</tt></b>
<blockquote>
A sorted list of tuples <tt>(line, file, name, doc)</tt> representing all of
the <tt>p_</tt> functions found. <tt>line</tt> and <tt>file</tt> give location
information. <tt>name</tt> is the name of the function. <tt>doc</tt> is the
documentation string. This list is sorted in ascending order by line number.
</blockquote>
<p>
<b><tt>p.files</tt></b>
<blockquote>
A dictionary holding all of the source filenames that were encountered
while collecting parser information. Only the keys of this dictionary have
any meaning.
</blockquote>
<p>
<b><tt>p.error</tt></b>
<blockquote>
An attribute that indicates whether or not any critical errors
occurred in validation. If this is set, it means that that some kind
of problem was detected and that no further processing should be
performed.
</blockquote>
<H2><a name="internal_nn9"></a>9. High-level operation</H2>
Using all of the above classes requires some attention to detail. The <tt>yacc()</tt>
function carries out a very specific sequence of operations to create a grammar.
This same sequence should be emulated if you build an alternative PLY interface.
<ol>
<li>A <tt>ParserReflect</tt> object is created and raw grammar specification data is
collected.
<li>A <tt>Grammar</tt> object is created and populated with information
from the specification data.
<li>A <tt>LRGenerator</tt> object is created to run the LALR algorithm over
the <tt>Grammar</tt> object.
<li>Productions in the LRGenerator and bound to callables using the <tt>bind_callables()</tt>
method.
<li>A <tt>LRParser</tt> object is created from from the information in the
<tt>LRGenerator</tt> object.
</ol>
</body>
</html>

10
ext/ply/doc/makedoc.py
View file

@ -93,7 +93,7 @@ for s in lines:
result.append("")
result.append("")
skipspace = 0
m = h2.match(s)
if m:
prevheadingtext = m.group(2)
@ -115,7 +115,7 @@ for s in lines:
subsection = 0
subsubsection = 0
subsubsubsection = 0
skipspace = 1
skipspace = 1
continue
m = h3.match(s)
if m:
@ -134,7 +134,7 @@ for s in lines:
index += """<li><a href="#%s">%s</a>\n""" % (headingname,prevheadingtext)
subsubsection = 0
skipspace = 1
skipspace = 1
continue
m = h4.match(s)
if m:
@ -151,7 +151,7 @@ for s in lines:
index += "<ul>\n"
index += """<li><a href="#%s">%s</a>\n""" % (headingname,prevheadingtext)
skipspace = 1
skipspace = 1
continue
m = h5.match(s)
if m:
@ -167,7 +167,7 @@ for s in lines:
index += """<li><a href="#%s">%s</a>\n""" % (headingname,prevheadingtext)
skipspace = 1
continue
result.append(s)
if subsubsubsection:

1099
ext/ply/doc/ply.html
View file

File diff suppressed because it is too large Load diff

9
ext/ply/example/BASIC/basic.py
View file

@ -4,6 +4,9 @@
import sys
sys.path.insert(0,"../..")
if sys.version_info[0] >= 3:
raw_input = input
import basiclex
import basparse
import basinterp
@ -41,7 +44,7 @@ while 1:
prog = basparse.parse(line)
if not prog: continue
keys = prog.keys()
keys = list(prog)
if keys[0] > 0:
b.add_statements(prog)
else:
@ -58,8 +61,8 @@ while 1:
elif stat[0] == 'NEW':
b.new()

16
ext/ply/example/BASIC/basiclex.py
View file

@ -25,7 +25,7 @@ def t_ID(t):
if t.value in keywords:
t.type = t.value
return t
t_EQUALS = r'='
t_PLUS = r'\+'
t_MINUS = r'-'
@ -41,7 +41,7 @@ t_GE = r'>='
t_NE = r'<>'
t_COMMA = r'\,'
t_SEMI = r';'
t_INTEGER = r'\d+'
t_INTEGER = r'\d+'
t_FLOAT = r'((\d*\.\d+)(E[\+-]?\d+)?|([1-9]\d*E[\+-]?\d+))'
t_STRING = r'\".*?\"'
@ -51,14 +51,10 @@ def t_NEWLINE(t):
return t
def t_error(t):
print "Illegal character", t.value[0]
print("Illegal character %s" % t.value[0])
t.lexer.skip(1)
lex.lex()
lex.lex(debug=0)
@ -66,6 +62,10 @@ lex.lex()

79
ext/ply/example/BASIC/basiclog.py Normal file
View file

@ -0,0 +1,79 @@
# An implementation of Dartmouth BASIC (1964)
#
import sys
sys.path.insert(0,"../..")
if sys.version_info[0] >= 3:
raw_input = input
import logging
logging.basicConfig(
level = logging.INFO,
filename = "parselog.txt",
filemode = "w"
)
log = logging.getLogger()
import basiclex
import basparse
import basinterp
# If a filename has been specified, we try to run it.
# If a runtime error occurs, we bail out and enter
# interactive mode below
if len(sys.argv) == 2:
data = open(sys.argv[1]).read()
prog = basparse.parse(data,debug=log)
if not prog: raise SystemExit
b = basinterp.BasicInterpreter(prog)
try:
b.run()
raise SystemExit
except RuntimeError:
pass
else:
b = basinterp.BasicInterpreter({})
# Interactive mode. This incrementally adds/deletes statements
# from the program stored in the BasicInterpreter object. In
# addition, special commands 'NEW','LIST',and 'RUN' are added.
# Specifying a line number with no code deletes that line from
# the program.
while 1:
try:
line = raw_input("[BASIC] ")
except EOFError:
raise SystemExit
if not line: continue
line += "\n"
prog = basparse.parse(line,debug=log)
if not prog: continue
keys = list(prog)
if keys[0] > 0:
b.add_statements(prog)
else:
stat = prog[keys[0]]
if stat[0] == 'RUN':
try:
b.run()
except RuntimeError:
pass
elif stat[0] == 'LIST':
b.list()
elif stat[0] == 'BLANK':
b.del_line(stat[1])
elif stat[0] == 'NEW':
b.new()

125
ext/ply/example/BASIC/basinterp.py
View file

@ -40,10 +40,11 @@ class BasicInterpreter:
if self.prog[lineno][0] == 'END' and not has_end:
has_end = lineno
if not has_end:
print "NO END INSTRUCTION"
print("NO END INSTRUCTION")
self.error = 1
return
if has_end != lineno:
print "END IS NOT LAST"
print("END IS NOT LAST")
self.error = 1
# Check loops
@ -60,9 +61,9 @@ class BasicInterpreter:
self.loopend[pc] = i
break
else:
print "FOR WITHOUT NEXT AT LINE" % self.stat[pc]
print("FOR WITHOUT NEXT AT LINE %s" % self.stat[pc])
self.error = 1
# Evaluate an expression
def eval(self,expr):
etype = expr[0]
@ -79,33 +80,33 @@ class BasicInterpreter:
elif etype == 'VAR':
var,dim1,dim2 = expr[1]
if not dim1 and not dim2:
if self.vars.has_key(var):
if var in self.vars:
return self.vars[var]
else:
print "UNDEFINED VARIABLE", var, "AT LINE", self.stat[self.pc]
print("UNDEFINED VARIABLE %s AT LINE %s" % (var, self.stat[self.pc]))
raise RuntimeError
# May be a list lookup or a function evaluation
if dim1 and not dim2:
if self.functions.has_key(var):
if var in self.functions:
# A function
return self.functions[var](dim1)
else:
# A list evaluation
if self.lists.has_key(var):
if var in self.lists:
dim1val = self.eval(dim1)
if dim1val < 1 or dim1val > len(self.lists[var]):
print "LIST INDEX OUT OF BOUNDS AT LINE", self.stat[self.pc]
print("LIST INDEX OUT OF BOUNDS AT LINE %s" % self.stat[self.pc])
raise RuntimeError
return self.lists[var][dim1val-1]
if dim1 and dim2:
if self.tables.has_key(var):
if var in self.tables:
dim1val = self.eval(dim1)
dim2val = self.eval(dim2)
if dim1val < 1 or dim1val > len(self.tables[var]) or dim2val < 1 or dim2val > len(self.tables[var][0]):
print "TABLE INDEX OUT OUT BOUNDS AT LINE", self.stat[self.pc]
print("TABLE INDEX OUT OUT BOUNDS AT LINE %s" % self.stat[self.pc])
raise RuntimeError
return self.tables[var][dim1val-1][dim2val-1]
print "UNDEFINED VARIABLE", var, "AT LINE", self.stat[self.pc]
print("UNDEFINED VARIABLE %s AT LINE %s" % (var, self.stat[self.pc]))
raise RuntimeError
# Evaluate a relational expression
@ -145,31 +146,31 @@ class BasicInterpreter:
elif dim1 and not dim2:
# List assignment
dim1val = self.eval(dim1)
if not self.lists.has_key(var):
if not var in self.lists:
self.lists[var] = [0]*10
if dim1val > len(self.lists[var]):
print "DIMENSION TOO LARGE AT LINE", self.stat[self.pc]
print ("DIMENSION TOO LARGE AT LINE %s" % self.stat[self.pc])
raise RuntimeError
self.lists[var][dim1val-1] = self.eval(value)
elif dim1 and dim2:
dim1val = self.eval(dim1)
dim2val = self.eval(dim2)
if not self.tables.has_key(var):
if not var in self.tables:
temp = [0]*10
v = []
for i in range(10): v.append(temp[:])
self.tables[var] = v
# Variable already exists
if dim1val > len(self.tables[var]) or dim2val > len(self.tables[var][0]):
print "DIMENSION TOO LARGE AT LINE", self.stat[self.pc]
print("DIMENSION TOO LARGE AT LINE %s" % self.stat[self.pc])
raise RuntimeError
self.tables[var][dim1val-1][dim2val-1] = self.eval(value)
# Change the current line number
def goto(self,linenum):
if not self.prog.has_key(linenum):
print "UNDEFINED LINE NUMBER %d AT LINE %d" % (linenum, self.stat[self.pc])
if not linenum in self.prog:
print("UNDEFINED LINE NUMBER %d AT LINE %d" % (linenum, self.stat[self.pc]))
raise RuntimeError
self.pc = self.stat.index(linenum)
@ -183,7 +184,7 @@ class BasicInterpreter:
self.gosub = None # Gosub return point (if any)
self.error = 0 # Indicates program error
self.stat = self.prog.keys() # Ordered list of all line numbers
self.stat = list(self.prog) # Ordered list of all line numbers
self.stat.sort()
self.pc = 0 # Current program counter
@ -198,7 +199,7 @@ class BasicInterpreter:
while 1:
line = self.stat[self.pc]
instr = self.prog[line]
op = instr[0]
# END and STOP statements
@ -225,11 +226,11 @@ class BasicInterpreter:
out += str(eval)
sys.stdout.write(out)
end = instr[2]
if not (end == ',' or end == ';'):
if not (end == ',' or end == ';'):
sys.stdout.write("\n")
if end == ',': sys.stdout.write(" "*(15-(len(out) % 15)))
if end == ';': sys.stdout.write(" "*(3-(len(out) % 3)))
# LET statement
elif op == 'LET':
target = instr[1]
@ -258,7 +259,7 @@ class BasicInterpreter:
initval = instr[2]
finval = instr[3]
stepval = instr[4]
# Check to see if this is a new loop
if not self.loops or self.loops[-1][0] != self.pc:
# Looks like a new loop. Make the initial assignment
@ -284,21 +285,21 @@ class BasicInterpreter:
elif op == 'NEXT':
if not self.loops:
print "NEXT WITHOUT FOR AT LINE",line
print("NEXT WITHOUT FOR AT LINE %s" % line)
return
nextvar = instr[1]
self.pc = self.loops[-1][0]
loopinst = self.prog[self.stat[self.pc]]
forvar = loopinst[1]
if nextvar != forvar:
print "NEXT DOESN'T MATCH FOR AT LINE", line
print("NEXT DOESN'T MATCH FOR AT LINE %s" % line)
return
continue
elif op == 'GOSUB':
newline = instr[1]
if self.gosub:
print "ALREADY IN A SUBROUTINE AT LINE", line
print("ALREADY IN A SUBROUTINE AT LINE %s" % line)
return
self.gosub = self.stat[self.pc]
self.goto(newline)
@ -306,7 +307,7 @@ class BasicInterpreter:
elif op == 'RETURN':
if not self.gosub:
print "RETURN WITHOUT A GOSUB AT LINE",line
print("RETURN WITHOUT A GOSUB AT LINE %s" % line)
return
self.goto(self.gosub)
self.gosub = None
@ -333,7 +334,7 @@ class BasicInterpreter:
v.append(temp[:])
self.tables[vname] = v
self.pc += 1
self.pc += 1
# Utility functions for program listing
def expr_str(self,expr):
@ -358,74 +359,74 @@ class BasicInterpreter:
# Create a program listing
def list(self):
stat = self.prog.keys() # Ordered list of all line numbers
stat = list(self.prog) # Ordered list of all line numbers
stat.sort()
for line in stat:
instr = self.prog[line]
op = instr[0]
if op in ['END','STOP','RETURN']:
print line, op
print("%s %s" % (line, op))
continue
elif op == 'REM':
print line, instr[1]
print("%s %s" % (line, instr[1]))
elif op == 'PRINT':
print line, op,
_out = "%s %s " % (line, op)
first = 1
for p in instr[1]:
if not first: print ",",
if p[0] and p[1]: print '"%s"%s' % (p[0],self.expr_str(p[1])),
elif p[1]: print self.expr_str(p[1]),
else: print '"%s"' % (p[0],),
if not first: _out += ", "
if p[0] and p[1]: _out += '"%s"%s' % (p[0],self.expr_str(p[1]))
elif p[1]: _out += self.expr_str(p[1])
else: _out += '"%s"' % (p[0],)
first = 0
if instr[2]: print instr[2]
else: print
if instr[2]: _out += instr[2]
print(_out)
elif op == 'LET':
print line,"LET",self.var_str(instr[1]),"=",self.expr_str(instr[2])
print("%s LET %s = %s" % (line,self.var_str(instr[1]),self.expr_str(instr[2])))
elif op == 'READ':
print line,"READ",
_out = "%s READ " % line
first = 1
for r in instr[1]:
if not first: print ",",
print self.var_str(r),
if not first: _out += ","
_out += self.var_str(r)
first = 0
print ""
print(_out)
elif op == 'IF':
print line,"IF %s THEN %d" % (self.relexpr_str(instr[1]),instr[2])
print("%s IF %s THEN %d" % (line,self.relexpr_str(instr[1]),instr[2]))
elif op == 'GOTO' or op == 'GOSUB':
print line, op, instr[1]
print("%s %s %s" % (line, op, instr[1]))
elif op == 'FOR':
print line,"FOR %s = %s TO %s" % (instr[1],self.expr_str(instr[2]),self.expr_str(instr[3])),
if instr[4]: print "STEP %s" % (self.expr_str(instr[4])),
print
_out = "%s FOR %s = %s TO %s" % (line,instr[1],self.expr_str(instr[2]),self.expr_str(instr[3]))
if instr[4]: _out += " STEP %s" % (self.expr_str(instr[4]))
print(_out)
elif op == 'NEXT':
print line,"NEXT", instr[1]
print("%s NEXT %s" % (line, instr[1]))
elif op == 'FUNC':
print line,"DEF %s(%s) = %s" % (instr[1],instr[2],self.expr_str(instr[3]))
print("%s DEF %s(%s) = %s" % (line,instr[1],instr[2],self.expr_str(instr[3])))
elif op == 'DIM':
print line,"DIM",
_out = "%s DIM " % line
first = 1
for vname,x,y in instr[1]:
if not first: print ",",
if not first: _out += ","
first = 0
if y == 0:
print "%s(%d)" % (vname,x),
_out += "%s(%d)" % (vname,x)
else:
print "%s(%d,%d)" % (vname,x,y),
print
_out += "%s(%d,%d)" % (vname,x,y)
print(_out)
elif op == 'DATA':
print line,"DATA",
_out = "%s DATA " % line
first = 1
for v in instr[1]:
if not first: print ",",
if not first: _out += ","
first = 0
print v,
print
_out += v
print(_out)
# Erase the current program
def new(self):
self.prog = {}
# Insert statements
def add_statements(self,prog):
for line,stat in prog.items():

26
ext/ply/example/BASIC/basparse.py
View file

@ -39,12 +39,12 @@ def p_program_error(p):
p[0] = None
p.parser.error = 1
#### Format of all BASIC statements.
#### Format of all BASIC statements.
def p_statement(p):
'''statement : INTEGER command NEWLINE'''
if isinstance(p[2],str):
print p[2],"AT LINE", p[1]
print("%s %s %s" % (p[2],"AT LINE", p[1]))
p[0] = None
p.parser.error = 1
else:
@ -68,7 +68,7 @@ def p_statement_blank(p):
def p_statement_bad(p):
'''statement : INTEGER error NEWLINE'''
print "MALFORMED STATEMENT AT LINE", p[1]
print("MALFORMED STATEMENT AT LINE %s" % p[1])
p[0] = None
p.parser.error = 1
@ -121,7 +121,7 @@ def p_command_print_bad(p):
#### Optional ending on PRINT. Either a comma (,) or semicolon (;)
def p_optend(p):
'''optend : COMMA
'''optend : COMMA
| SEMI
|'''
if len(p) == 2:
@ -188,7 +188,7 @@ def p_optstep(p):
p[0] = None
#### NEXT statement
def p_command_next(p):
'''command : NEXT ID'''
@ -392,30 +392,30 @@ def p_item_expr(p):
p[0] = ("",p[1])
#### Empty
def p_empty(p):
'''empty : '''
#### Catastrophic error handler
def p_error(p):
if not p:
print "SYNTAX ERROR AT EOF"
print("SYNTAX ERROR AT EOF")
bparser = yacc.yacc()
def parse(data):
def parse(data,debug=0):
bparser.error = 0
p = bparser.parse(data)
p = bparser.parse(data,debug=debug)
if bparser.error: return None
return p

28
ext/ply/example/GardenSnake/GardenSnake.py
View file

@ -180,7 +180,7 @@ def track_tokens_filter(lexer, tokens):
at_line_start = False
indent = MAY_INDENT
token.must_indent = False
elif token.type == "NEWLINE":
at_line_start = True
if indent == MAY_INDENT:
@ -235,7 +235,7 @@ def indentation_filter(tokens):
## if token.must_indent:
## print "must_indent",
## print
# WS only occurs at the start of the line
# There may be WS followed by NEWLINE so
# only track the depth here. Don't indent/dedent
@ -294,7 +294,7 @@ def indentation_filter(tokens):
assert token is not None
for _ in range(1, len(levels)):
yield DEDENT(token.lineno)
# The top-level filter adds an ENDMARKER, if requested.
# Python's grammar uses it.
@ -376,14 +376,14 @@ def p_file_input(p):
p[0] = p[1] + p[2]
else:
p[0] = p[1]
# funcdef: [decorators] 'def' NAME parameters ':' suite
# ignoring decorators
def p_funcdef(p):
"funcdef : DEF NAME parameters COLON suite"
p[0] = ast.Function(None, p[2], tuple(p[3]), (), 0, None, p[5])
# parameters: '(' [varargslist] ')'
def p_parameters(p):
"""parameters : LPAR RPAR
@ -392,9 +392,9 @@ def p_parameters(p):
p[0] = []
else:
p[0] = p[2]
# varargslist: (fpdef ['=' test] ',')* ('*' NAME [',' '**' NAME] | '**' NAME) |
# varargslist: (fpdef ['=' test] ',')* ('*' NAME [',' '**' NAME] | '**' NAME) |
# highly simplified
def p_varargslist(p):
"""varargslist : varargslist COMMA NAME
@ -409,7 +409,7 @@ def p_stmt_simple(p):
"""stmt : simple_stmt"""
# simple_stmt is a list
p[0] = p[1]
def p_stmt_compound(p):
"""stmt : compound_stmt"""
p[0] = [p[1]]
@ -474,7 +474,7 @@ def p_suite(p):
p[0] = ast.Stmt(p[1])
else:
p[0] = ast.Stmt(p[3])
def p_stmts(p):
"""stmts : stmts stmt
@ -536,7 +536,7 @@ def p_comparison(p):
p[0] = unary_ops[p[1]](p[2])
else:
p[0] = p[1]
# power: atom trailer* ['**' factor]
# trailers enables function calls. I only allow one level of calls
# so this is 'trailer'
@ -605,7 +605,7 @@ def p_testlist_multi(p):
def p_test(p):
"test : comparison"
p[0] = p[1]
# arglist: (argument ',')* (argument [',']| '*' test [',' '**' test] | '**' test)
@ -642,7 +642,7 @@ class GardenSnakeParser(object):
###### Code generation ######
from compiler import misc, syntax, pycodegen
class GardenSnakeCompiler(object):
@ -658,13 +658,13 @@ class GardenSnakeCompiler(object):
return code
####### Test code #######
compile = GardenSnakeCompiler().compile
code = r"""
print('LET\'S TRY THIS \\OUT')
#Comment here
def x(a):
print('called with',a)

20
ext/ply/example/ansic/clex.py
View file

@ -26,7 +26,7 @@ tokens = reserved + (
'OR', 'AND', 'NOT', 'XOR', 'LSHIFT', 'RSHIFT',
'LOR', 'LAND', 'LNOT',
'LT', 'LE', 'GT', 'GE', 'EQ', 'NE',
# Assignment (=, *=, /=, %=, +=, -=, <<=, >>=, &=, ^=, |=)
'EQUALS', 'TIMESEQUAL', 'DIVEQUAL', 'MODEQUAL', 'PLUSEQUAL', 'MINUSEQUAL',
'LSHIFTEQUAL','RSHIFTEQUAL', 'ANDEQUAL', 'XOREQUAL', 'OREQUAL',
@ -39,7 +39,7 @@ tokens = reserved + (
# Conditional operator (?)
'CONDOP',
# Delimeters ( ) [ ] { } , . ; :
'LPAREN', 'RPAREN',
'LBRACKET', 'RBRACKET',
@ -57,7 +57,7 @@ t_ignore = ' \t\x0c'
def t_NEWLINE(t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
# Operators
t_PLUS = r'\+'
t_MINUS = r'-'
@ -142,23 +142,23 @@ t_CCONST = r'(L)?\'([^\\\n]|(\\.))*?\''
# Comments
def t_comment(t):
r' /\*(.|\n)*?\*/'
t.lineno += t.value.count('\n')
r'/\*(.|\n)*?\*/'
t.lexer.lineno += t.value.count('\n')
# Preprocessor directive (ignored)
def t_preprocessor(t):
r'\#(.)*?\n'
t.lineno += 1
t.lexer.lineno += 1
def t_error(t):
print "Illegal character %s" % repr(t.value[0])
print("Illegal character %s" % repr(t.value[0]))
t.lexer.skip(1)
lexer = lex.lex(optimize=1)
if __name__ == "__main__":
lex.runmain(lexer)

10
ext/ply/example/ansic/cparse.py
View file

@ -155,7 +155,7 @@ def p_struct_declaration_list_1(t):
pass
def p_struct_declaration_list_2(t):
'struct_declaration_list : struct_declarator_list struct_declaration'
'struct_declaration_list : struct_declaration_list struct_declaration'
pass
# init-declarator-list:
@ -778,12 +778,12 @@ def p_unary_expression_5(t):
def p_unary_expression_6(t):
'unary_expression : SIZEOF LPAREN type_name RPAREN'
pass
#unary-operator
def p_unary_operator(t):
'''unary_operator : AND
| TIMES
| PLUS
| PLUS
| MINUS
| NOT
| LNOT '''
@ -837,7 +837,7 @@ def p_argument_expression_list(t):
pass
# constant:
def p_constant(t):
def p_constant(t):
'''constant : ICONST
| FCONST
| CCONST'''
@ -849,7 +849,7 @@ def p_empty(t):
pass
def p_error(t):
print "Whoa. We're hosed"
print("Whoa. We're hosed")
import profile
# Build the grammar

24
ext/ply/example/calc/calc.py
View file

@ -8,6 +8,9 @@
import sys
sys.path.insert(0,"../..")
if sys.version_info[0] >= 3:
raw_input = input
tokens = (
'NAME','NUMBER',
)
@ -20,11 +23,7 @@ t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print "Integer value too large", t.value
t.value = 0
t.value = int(t.value)
return t
t_ignore = " \t"
@ -32,11 +31,11 @@ t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(t):
print "Illegal character '%s'" % t.value[0]
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
import ply.lex as lex
lex.lex()
@ -58,7 +57,7 @@ def p_statement_assign(p):
def p_statement_expr(p):
'statement : expression'
print p[1]
print(p[1])
def p_expression_binop(p):
'''expression : expression '+' expression
@ -87,11 +86,14 @@ def p_expression_name(p):
try:
p[0] = names[p[1]]
except LookupError:
print "Undefined name '%s'" % p[1]
print("Undefined name '%s'" % p[1])
p[0] = 0
def p_error(p):
print "Syntax error at '%s'" % p.value
if p:
print("Syntax error at '%s'" % p.value)
else:
print("Syntax error at EOF")
import ply.yacc as yacc
yacc.yacc()

113
ext/ply/example/calcdebug/calc.py Normal file
View file

@ -0,0 +1,113 @@
# -----------------------------------------------------------------------------
# calc.py
#
# This example shows how to run the parser in a debugging mode
# with output routed to a logging object.
# -----------------------------------------------------------------------------
import sys
sys.path.insert(0,"../..")
if sys.version_info[0] >= 3:
raw_input = input
tokens = (
'NAME','NUMBER',
)
literals = ['=','+','-','*','/', '(',')']
# Tokens
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
t.value = int(t.value)
return t
t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
import ply.lex as lex
lex.lex()
# Parsing rules
precedence = (
('left','+','-'),
('left','*','/'),
('right','UMINUS'),
)
# dictionary of names
names = { }
def p_statement_assign(p):
'statement : NAME "=" expression'
names[p[1]] = p[3]
def p_statement_expr(p):
'statement : expression'
print(p[1])
def p_expression_binop(p):
'''expression : expression '+' expression
| expression '-' expression
| expression '*' expression
| expression '/' expression'''
if p[2] == '+' : p[0] = p[1] + p[3]
elif p[2] == '-': p[0] = p[1] - p[3]
elif p[2] == '*': p[0] = p[1] * p[3]
elif p[2] == '/': p[0] = p[1] / p[3]
def p_expression_uminus(p):
"expression : '-' expression %prec UMINUS"
p[0] = -p[2]
def p_expression_group(p):
"expression : '(' expression ')'"
p[0] = p[2]
def p_expression_number(p):
"expression : NUMBER"
p[0] = p[1]
def p_expression_name(p):
"expression : NAME"
try:
p[0] = names[p[1]]
except LookupError:
print("Undefined name '%s'" % p[1])
p[0] = 0
def p_error(p):
if p:
print("Syntax error at '%s'" % p.value)
else:
print("Syntax error at EOF")
import ply.yacc as yacc
yacc.yacc()
import logging
logging.basicConfig(
level=logging.INFO,
filename="parselog.txt"
)
while 1:
try:
s = raw_input('calc > ')
except EOFError:
break
if not s: continue
yacc.parse(s,debug=logging.getLogger())

21
ext/ply/example/classcalc/calc.py Normal file → Executable file
View file

@ -12,7 +12,9 @@
import sys
sys.path.insert(0,"../..")
import readline
if sys.version_info[0] >= 3:
raw_input = input
import ply.lex as lex
import ply.yacc as yacc
import os
@ -51,7 +53,7 @@ class Parser:
if not s: continue
yacc.parse(s)
class Calc(Parser):
tokens = (
@ -77,7 +79,7 @@ class Calc(Parser):
try:
t.value = int(t.value)
except ValueError:
print "Integer value too large", t.value
print("Integer value too large %s" % t.value)
t.value = 0
#print "parsed number %s" % repr(t.value)
return t
@ -87,9 +89,9 @@ class Calc(Parser):
def t_newline(self, t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(self, t):
print "Illegal character '%s'" % t.value[0]
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Parsing rules
@ -107,7 +109,7 @@ class Calc(Parser):
def p_statement_expr(self, p):
'statement : expression'
print p[1]
print(p[1])
def p_expression_binop(self, p):
"""
@ -141,11 +143,14 @@ class Calc(Parser):
try:
p[0] = self.names[p[1]]
except LookupError:
print "Undefined name '%s'" % p[1]
print("Undefined name '%s'" % p[1])
p[0] = 0
def p_error(self, p):
print "Syntax error at '%s'" % p.value
if p:
print("Syntax error at '%s'" % p.value)
else:
print("Syntax error at EOF")
if __name__ == '__main__':
calc = Calc()

0
ext/ply/example/cleanup.sh Normal file → Executable file
View file

130
ext/ply/example/closurecalc/calc.py Normal file
View file

@ -0,0 +1,130 @@
# -----------------------------------------------------------------------------
# calc.py
#
# A calculator parser that makes use of closures. The function make_calculator()
# returns a function that accepts an input string and returns a result. All
# lexing rules, parsing rules, and internal state are held inside the function.
# -----------------------------------------------------------------------------
import sys
sys.path.insert(0,"../..")
if sys.version_info[0] >= 3:
raw_input = input
# Make a calculator function
def make_calculator():
import ply.lex as lex
import ply.yacc as yacc
# ------- Internal calculator state
variables = { } # Dictionary of stored variables
# ------- Calculator tokenizing rules
tokens = (
'NAME','NUMBER',
)
literals = ['=','+','-','*','/', '(',')']
t_ignore = " \t"
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
t.value = int(t.value)
return t
def t_newline(t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
lexer = lex.lex()
# ------- Calculator parsing rules
precedence = (
('left','+','-'),
('left','*','/'),
('right','UMINUS'),
)
def p_statement_assign(p):
'statement : NAME "=" expression'
variables[p[1]] = p[3]
p[0] = None
def p_statement_expr(p):
'statement : expression'
p[0] = p[1]
def p_expression_binop(p):
'''expression : expression '+' expression
| expression '-' expression
| expression '*' expression
| expression '/' expression'''
if p[2] == '+' : p[0] = p[1] + p[3]
elif p[2] == '-': p[0] = p[1] - p[3]
elif p[2] == '*': p[0] = p[1] * p[3]
elif p[2] == '/': p[0] = p[1] / p[3]
def p_expression_uminus(p):
"expression : '-' expression %prec UMINUS"
p[0] = -p[2]
def p_expression_group(p):
"expression : '(' expression ')'"
p[0] = p[2]
def p_expression_number(p):
"expression : NUMBER"
p[0] = p[1]
def p_expression_name(p):
"expression : NAME"
try:
p[0] = variables[p[1]]
except LookupError:
print("Undefined name '%s'" % p[1])
p[0] = 0
def p_error(p):
if p:
print("Syntax error at '%s'" % p.value)
else:
print("Syntax error at EOF")
# Build the parser
parser = yacc.yacc()
# ------- Input function
def input(text):
result = parser.parse(text,lexer=lexer)
return result
return input
# Make a calculator object and use it
calc = make_calculator()
while True:
try:
s = raw_input("calc > ")
except EOFError:
break
r = calc(s)
if r:
print(r)

12
ext/ply/example/hedit/hedit.py
View file

@ -29,17 +29,17 @@ def t_H_EDIT_DESCRIPTOR(t):
r"\d+H.*" # This grabs all of the remaining text
i = t.value.index('H')
n = eval(t.value[:i])
# Adjust the tokenizing position
t.lexer.lexpos -= len(t.value) - (i+1+n)
t.value = t.value[i+1:i+1+n]
return t
return t
def t_error(t):
print "Illegal character '%s'" % t.value[0]
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
import ply.lex as lex
lex.lex()

23
ext/ply/example/newclasscalc/calc.py Normal file → Executable file
View file

@ -14,7 +14,9 @@
import sys
sys.path.insert(0,"../..")
import readline
if sys.version_info[0] >= 3:
raw_input = input
import ply.lex as lex
import ply.yacc as yacc
import os
@ -51,10 +53,10 @@ class Parser(object):
s = raw_input('calc > ')
except EOFError:
break
if not s: continue
if not s: continue
yacc.parse(s)
class Calc(Parser):
tokens = (
@ -80,7 +82,7 @@ class Calc(Parser):
try:
t.value = int(t.value)
except ValueError:
print "Integer value too large", t.value
print("Integer value too large %s" % t.value)
t.value = 0
#print "parsed number %s" % repr(t.value)
return t
@ -90,9 +92,9 @@ class Calc(Parser):
def t_newline(self, t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(self, t):
print "Illegal character '%s'" % t.value[0]
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Parsing rules
@ -110,7 +112,7 @@ class Calc(Parser):
def p_statement_expr(self, p):
'statement : expression'
print p[1]
print(p[1])
def p_expression_binop(self, p):
"""
@ -144,11 +146,14 @@ class Calc(Parser):
try:
p[0] = self.names[p[1]]
except LookupError:
print "Undefined name '%s'" % p[1]
print("Undefined name '%s'" % p[1])
p[0] = 0
def p_error(self, p):
print "Syntax error at '%s'" % p.value
if p:
print("Syntax error at '%s'" % p.value)
else:
print("Syntax error at EOF")
if __name__ == '__main__':
calc = Calc()

2
ext/ply/example/optcalc/README
View file

@ -5,5 +5,5 @@ To run:
- Then run 'python -OO calc.py'
If working corretly, the second version should run the
If working correctly, the second version should run the
same way.

20
ext/ply/example/optcalc/calc.py
View file

@ -8,6 +8,9 @@
import sys
sys.path.insert(0,"../..")
if sys.version_info[0] >= 3:
raw_input = input
tokens = (
'NAME','NUMBER',
'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
@ -30,7 +33,7 @@ def t_NUMBER(t):
try:
t.value = int(t.value)
except ValueError:
print "Integer value too large", t.value
print("Integer value too large %s" % t.value)
t.value = 0
return t
@ -39,11 +42,11 @@ t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(t):
print "Illegal character '%s'" % t.value[0]
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
import ply.lex as lex
lex.lex(optimize=1)
@ -65,7 +68,7 @@ def p_statement_assign(t):
def p_statement_expr(t):
'statement : expression'
print t[1]
print(t[1])
def p_expression_binop(t):
'''expression : expression PLUS expression
@ -95,11 +98,14 @@ def p_expression_name(t):
try:
t[0] = names[t[1]]
except LookupError:
print "Undefined name '%s'" % t[1]
print("Undefined name '%s'" % t[1])
t[0] = 0
def p_error(t):
print "Syntax error at '%s'" % t.value
if t:
print("Syntax error at '%s'" % t.value)
else:
print("Syntax error at EOF")
import ply.yacc as yacc
yacc.yacc(optimize=1)

9
ext/ply/example/unicalc/calc.py
View file

@ -41,11 +41,11 @@ t_ignore = u" \t"
def t_newline(t):
ur'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(t):
print "Illegal character '%s'" % t.value[0]
t.lexer.skip(1)
# Build the lexer
import ply.lex as lex
lex.lex()
@ -100,7 +100,10 @@ def p_expression_name(p):
p[0] = 0
def p_error(p):
print "Syntax error at '%s'" % p.value
if p:
print "Syntax error at '%s'" % p.value
else:
print "Syntax error at EOF"
import ply.yacc as yacc
yacc.yacc()

12
ext/ply/example/yply/ylex.py
View file

@ -42,7 +42,7 @@ def t_SECTION(t):
# Comments
def t_ccomment(t):
r'/\*(.|\n)*?\*/'
t.lineno += t.value.count('\n')
t.lexer.lineno += t.value.count('\n')
t_ignore_cppcomment = r'//.*'
@ -95,7 +95,7 @@ def t_code_error(t):
raise RuntimeError
def t_error(t):
print "%d: Illegal character '%s'" % (t.lineno, t.value[0])
print "%d: Illegal character '%s'" % (t.lexer.lineno, t.value[0])
print t.value
t.lexer.skip(1)
@ -104,9 +104,9 @@ lex.lex()
if __name__ == '__main__':
lex.runmain()

14
ext/ply/example/yply/yparse.py
View file

@ -25,7 +25,7 @@ def p_defsection(p):
print "precedence = ", repr(preclist)
print
print "# -------------- RULES ----------------"
print
print
def p_rulesection(p):
'''rulesection : rules SECTION'''
@ -78,12 +78,12 @@ def p_idlist(p):
p[1].append(p[3])
def p_tokenid(p):
'''tokenid : ID
'''tokenid : ID
| ID NUMBER
| QLITERAL
| QLITERAL NUMBER'''
p[0] = p[1]
def p_optsemi(p):
'''optsemi : ';'
| empty'''
@ -165,7 +165,7 @@ def p_rule_empty(p):
def p_rule_empty2(p):
'''rule : ID ':' morerules ';' '''
p[3].insert(0,[])
p[0] = (p[1],p[3])
@ -173,10 +173,10 @@ def p_morerules(p):
'''morerules : morerules '|' rulelist
| '|' rulelist
| '|' '''
if len(p) == 2:
if len(p) == 2:
p[0] = [[]]
elif len(p) == 3:
elif len(p) == 3:
p[0] = [p[2]]
else:
p[0] = p[1]

0
ext/ply/example/yply/yply.py Normal file → Executable file
View file

898
ext/ply/ply/cpp.py Normal file
View file

@ -0,0 +1,898 @@
# -----------------------------------------------------------------------------
# cpp.py
#
# Author: David Beazley (http://www.dabeaz.com)
# Copyright (C) 2007
# All rights reserved
#
# This module implements an ANSI-C style lexical preprocessor for PLY.
# -----------------------------------------------------------------------------
from __future__ import generators
# -----------------------------------------------------------------------------
# Default preprocessor lexer definitions. These tokens are enough to get
# a basic preprocessor working. Other modules may import these if they want
# -----------------------------------------------------------------------------
tokens = (
'CPP_ID','CPP_INTEGER', 'CPP_FLOAT', 'CPP_STRING', 'CPP_CHAR', 'CPP_WS', 'CPP_COMMENT', 'CPP_POUND','CPP_DPOUND'
)
literals = "+-*/%|&~^<>=!?()[]{}.,;:\\\'\""
# Whitespace
def t_CPP_WS(t):
r'\s+'
t.lexer.lineno += t.value.count("\n")
return t
t_CPP_POUND = r'\#'
t_CPP_DPOUND = r'\#\#'
# Identifier
t_CPP_ID = r'[A-Za-z_][\w_]*'
# Integer literal
def CPP_INTEGER(t):
r'(((((0x)|(0X))[0-9a-fA-F]+)|(\d+))([uU]|[lL]|[uU][lL]|[lL][uU])?)'
return t
t_CPP_INTEGER = CPP_INTEGER
# Floating literal
t_CPP_FLOAT = r'((\d+)(\.\d+)(e(\+|-)?(\d+))? | (\d+)e(\+|-)?(\d+))([lL]|[fF])?'
# String literal
def t_CPP_STRING(t):
r'\"([^\\\n]|(\\(.|\n)))*?\"'
t.lexer.lineno += t.value.count("\n")
return t
# Character constant 'c' or L'c'
def t_CPP_CHAR(t):
r'(L)?\'([^\\\n]|(\\(.|\n)))*?\''
t.lexer.lineno += t.value.count("\n")
return t
# Comment
def t_CPP_COMMENT(t):
r'(/\*(.|\n)*?\*/)|(//.*?\n)'
t.lexer.lineno += t.value.count("\n")
return t
def t_error(t):
t.type = t.value[0]
t.value = t.value[0]
t.lexer.skip(1)
return t
import re
import copy
import time
import os.path
# -----------------------------------------------------------------------------
# trigraph()
#
# Given an input string, this function replaces all trigraph sequences.
# The following mapping is used:
#
# ??= #
# ??/ \
# ??' ^
# ??( [
# ??) ]
# ??! |
# ??< {
# ??> }
# ??- ~
# -----------------------------------------------------------------------------
_trigraph_pat = re.compile(r'''\?\?[=/\'\(\)\!<>\-]''')
_trigraph_rep = {
'=':'#',
'/':'\\',
"'":'^',
'(':'[',
')':']',
'!':'|',
'<':'{',
'>':'}',
'-':'~'
}
def trigraph(input):
return _trigraph_pat.sub(lambda g: _trigraph_rep[g.group()[-1]],input)
# ------------------------------------------------------------------
# Macro object
#
# This object holds information about preprocessor macros
#
# .name - Macro name (string)
# .value - Macro value (a list of tokens)
# .arglist - List of argument names
# .variadic - Boolean indicating whether or not variadic macro
# .vararg - Name of the variadic parameter
#
# When a macro is created, the macro replacement token sequence is
# pre-scanned and used to create patch lists that are later used
# during macro expansion
# ------------------------------------------------------------------
class Macro(object):
def __init__(self,name,value,arglist=None,variadic=False):
self.name = name
self.value = value
self.arglist = arglist
self.variadic = variadic
if variadic:
self.vararg = arglist[-1]
self.source = None
# ------------------------------------------------------------------
# Preprocessor object
#
# Object representing a preprocessor. Contains macro definitions,
# include directories, and other information
# ------------------------------------------------------------------
class Preprocessor(object):
def __init__(self,lexer=None):
if lexer is None:
lexer = lex.lexer
self.lexer = lexer
self.macros = { }
self.path = []
self.temp_path = []
# Probe the lexer for selected tokens
self.lexprobe()
tm = time.localtime()
self.define("__DATE__ \"%s\"" % time.strftime("%b %d %Y",tm))
self.define("__TIME__ \"%s\"" % time.strftime("%H:%M:%S",tm))
self.parser = None
# -----------------------------------------------------------------------------
# tokenize()
#
# Utility function. Given a string of text, tokenize into a list of tokens
# -----------------------------------------------------------------------------
def tokenize(self,text):
tokens = []
self.lexer.input(text)
while True:
tok = self.lexer.token()
if not tok: break
tokens.append(tok)
return tokens
# ---------------------------------------------------------------------
# error()
#
# Report a preprocessor error/warning of some kind
# ----------------------------------------------------------------------
def error(self,file,line,msg):
print >>sys.stderr,"%s:%d %s" % (file,line,msg)
# ----------------------------------------------------------------------
# lexprobe()
#
# This method probes the preprocessor lexer object to discover
# the token types of symbols that are important to the preprocessor.
# If this works right, the preprocessor will simply "work"
# with any suitable lexer regardless of how tokens have been named.
# ----------------------------------------------------------------------
def lexprobe(self):
# Determine the token type for identifiers
self.lexer.input("identifier")
tok = self.lexer.token()
if not tok or tok.value != "identifier":
print "Couldn't determine identifier type"
else:
self.t_ID = tok.type
# Determine the token type for integers
self.lexer.input("12345")
tok = self.lexer.token()
if not tok or int(tok.value) != 12345:
print "Couldn't determine integer type"
else:
self.t_INTEGER = tok.type
self.t_INTEGER_TYPE = type(tok.value)
# Determine the token type for strings enclosed in double quotes
self.lexer.input("\"filename\"")
tok = self.lexer.token()
if not tok or tok.value != "\"filename\"":
print "Couldn't determine string type"
else:
self.t_STRING = tok.type
# Determine the token type for whitespace--if any
self.lexer.input(" ")
tok = self.lexer.token()
if not tok or tok.value != " ":
self.t_SPACE = None
else:
self.t_SPACE = tok.type
# Determine the token type for newlines
self.lexer.input("\n")
tok = self.lexer.token()
if not tok or tok.value != "\n":
self.t_NEWLINE = None
print "Couldn't determine token for newlines"
else:
self.t_NEWLINE = tok.type
self.t_WS = (self.t_SPACE, self.t_NEWLINE)
# Check for other characters used by the preprocessor
chars = [ '<','>','#','##','\\','(',')',',','.']
for c in chars:
self.lexer.input(c)
tok = self.lexer.token()
if not tok or tok.value != c:
print "Unable to lex '%s' required for preprocessor" % c
# ----------------------------------------------------------------------
# add_path()
#
# Adds a search path to the preprocessor.
# ----------------------------------------------------------------------
def add_path(self,path):
self.path.append(path)
# ----------------------------------------------------------------------
# group_lines()
#
# Given an input string, this function splits it into lines. Trailing whitespace
# is removed. Any line ending with \ is grouped with the next line. This
# function forms the lowest level of the preprocessor---grouping into text into
# a line-by-line format.
# ----------------------------------------------------------------------
def group_lines(self,input):
lex = self.lexer.clone()
lines = [x.rstrip() for x in input.splitlines()]
for i in xrange(len(lines)):
j = i+1
while lines[i].endswith('\\') and (j < len(lines)):
lines[i] = lines[i][:-1]+lines[j]
lines[j] = ""
j += 1
input = "\n".join(lines)
lex.input(input)
lex.lineno = 1
current_line = []
while True:
tok = lex.token()
if not tok:
break
current_line.append(tok)
if tok.type in self.t_WS and '\n' in tok.value:
yield current_line
current_line = []
if current_line:
yield current_line
# ----------------------------------------------------------------------
# tokenstrip()
#
# Remove leading/trailing whitespace tokens from a token list
# ----------------------------------------------------------------------
def tokenstrip(self,tokens):
i = 0
while i < len(tokens) and tokens[i].type in self.t_WS:
i += 1
del tokens[:i]
i = len(tokens)-1
while i >= 0 and tokens[i].type in self.t_WS:
i -= 1
del tokens[i+1:]
return tokens
# ----------------------------------------------------------------------
# collect_args()
#
# Collects comma separated arguments from a list of tokens. The arguments
# must be enclosed in parenthesis. Returns a tuple (tokencount,args,positions)
# where tokencount is the number of tokens consumed, args is a list of arguments,
# and positions is a list of integers containing the starting index of each
# argument. Each argument is represented by a list of tokens.
#
# When collecting arguments, leading and trailing whitespace is removed
# from each argument.
#
# This function properly handles nested parenthesis and commas---these do not
# define new arguments.
# ----------------------------------------------------------------------
def collect_args(self,tokenlist):
args = []
positions = []
current_arg = []
nesting = 1
tokenlen = len(tokenlist)
# Search for the opening '('.
i = 0
while (i < tokenlen) and (tokenlist[i].type in self.t_WS):
i += 1
if (i < tokenlen) and (tokenlist[i].value == '('):
positions.append(i+1)
else:
self.error(self.source,tokenlist[0].lineno,"Missing '(' in macro arguments")
return 0, [], []
i += 1
while i < tokenlen:
t = tokenlist[i]
if t.value == '(':
current_arg.append(t)
nesting += 1
elif t.value == ')':
nesting -= 1
if nesting == 0:
if current_arg:
args.append(self.tokenstrip(current_arg))
positions.append(i)
return i+1,args,positions
current_arg.append(t)
elif t.value == ',' and nesting == 1:
args.append(self.tokenstrip(current_arg))
positions.append(i+1)
current_arg = []
else:
current_arg.append(t)
i += 1
# Missing end argument
self.error(self.source,tokenlist[-1].lineno,"Missing ')' in macro arguments")
return 0, [],[]
# ----------------------------------------------------------------------
# macro_prescan()
#
# Examine the macro value (token sequence) and identify patch points
# This is used to speed up macro expansion later on---we'll know
# right away where to apply patches to the value to form the expansion
# ----------------------------------------------------------------------
def macro_prescan(self,macro):
macro.patch = [] # Standard macro arguments
macro.str_patch = [] # String conversion expansion
macro.var_comma_patch = [] # Variadic macro comma patch
i = 0
while i < len(macro.value):
if macro.value[i].type == self.t_ID and macro.value[i].value in macro.arglist:
argnum = macro.arglist.index(macro.value[i].value)
# Conversion of argument to a string
if i > 0 and macro.value[i-1].value == '#':
macro.value[i] = copy.copy(macro.value[i])
macro.value[i].type = self.t_STRING
del macro.value[i-1]
macro.str_patch.append((argnum,i-1))
continue
# Concatenation
elif (i > 0 and macro.value[i-1].value == '##'):
macro.patch.append(('c',argnum,i-1))
del macro.value[i-1]
continue
elif ((i+1) < len(macro.value) and macro.value[i+1].value == '##'):
macro.patch.append(('c',argnum,i))
i += 1
continue
# Standard expansion
else:
macro.patch.append(('e',argnum,i))
elif macro.value[i].value == '##':
if macro.variadic and (i > 0) and (macro.value[i-1].value == ',') and \
((i+1) < len(macro.value)) and (macro.value[i+1].type == self.t_ID) and \
(macro.value[i+1].value == macro.vararg):
macro.var_comma_patch.append(i-1)
i += 1
macro.patch.sort(key=lambda x: x[2],reverse=True)
# ----------------------------------------------------------------------
# macro_expand_args()
#
# Given a Macro and list of arguments (each a token list), this method
# returns an expanded version of a macro. The return value is a token sequence
# representing the replacement macro tokens
# ----------------------------------------------------------------------
def macro_expand_args(self,macro,args):
# Make a copy of the macro token sequence
rep = [copy.copy(_x) for _x in macro.value]
# Make string expansion patches. These do not alter the length of the replacement sequence
str_expansion = {}
for argnum, i in macro.str_patch:
if argnum not in str_expansion:
str_expansion[argnum] = ('"%s"' % "".join([x.value for x in args[argnum]])).replace("\\","\\\\")
rep[i] = copy.copy(rep[i])
rep[i].value = str_expansion[argnum]
# Make the variadic macro comma patch. If the variadic macro argument is empty, we get rid
comma_patch = False
if macro.variadic and not args[-1]:
for i in macro.var_comma_patch:
rep[i] = None
comma_patch = True
# Make all other patches. The order of these matters. It is assumed that the patch list
# has been sorted in reverse order of patch location since replacements will cause the
# size of the replacement sequence to expand from the patch point.
expanded = { }
for ptype, argnum, i in macro.patch:
# Concatenation. Argument is left unexpanded
if ptype == 'c':
rep[i:i+1] = args[argnum]
# Normal expansion. Argument is macro expanded first
elif ptype == 'e':
if argnum not in expanded:
expanded[argnum] = self.expand_macros(args[argnum])
rep[i:i+1] = expanded[argnum]
# Get rid of removed comma if necessary
if comma_patch:
rep = [_i for _i in rep if _i]
return rep
# ----------------------------------------------------------------------
# expand_macros()
#
# Given a list of tokens, this function performs macro expansion.
# The expanded argument is a dictionary that contains macros already
# expanded. This is used to prevent infinite recursion.
# ----------------------------------------------------------------------
def expand_macros(self,tokens,expanded=None):
if expanded is None:
expanded = {}
i = 0
while i < len(tokens):
t = tokens[i]
if t.type == self.t_ID:
if t.value in self.macros and t.value not in expanded:
# Yes, we found a macro match
expanded[t.value] = True
m = self.macros[t.value]
if not m.arglist:
# A simple macro
ex = self.expand_macros([copy.copy(_x) for _x in m.value],expanded)
for e in ex:
e.lineno = t.lineno
tokens[i:i+1] = ex
i += len(ex)
else:
# A macro with arguments
j = i + 1
while j < len(tokens) and tokens[j].type in self.t_WS:
j += 1
if tokens[j].value == '(':
tokcount,args,positions = self.collect_args(tokens[j:])
if not m.variadic and len(args) != len(m.arglist):
self.error(self.source,t.lineno,"Macro %s requires %d arguments" % (t.value,len(m.arglist)))
i = j + tokcount
elif m.variadic and len(args) < len(m.arglist)-1:
if len(m.arglist) > 2:
self.error(self.source,t.lineno,"Macro %s must have at least %d arguments" % (t.value, len(m.arglist)-1))
else:
self.error(self.source,t.lineno,"Macro %s must have at least %d argument" % (t.value, len(m.arglist)-1))
i = j + tokcount
else:
if m.variadic:
if len(args) == len(m.arglist)-1:
args.append([])
else:
args[len(m.arglist)-1] = tokens[j+positions[len(m.arglist)-1]:j+tokcount-1]
del args[len(m.arglist):]
# Get macro replacement text
rep = self.macro_expand_args(m,args)
rep = self.expand_macros(rep,expanded)
for r in rep:
r.lineno = t.lineno
tokens[i:j+tokcount] = rep
i += len(rep)
del expanded[t.value]
continue
elif t.value == '__LINE__':
t.type = self.t_INTEGER
t.value = self.t_INTEGER_TYPE(t.lineno)
i += 1
return tokens
# ----------------------------------------------------------------------
# evalexpr()
#
# Evaluate an expression token sequence for the purposes of evaluating
# integral expressions.
# ----------------------------------------------------------------------
def evalexpr(self,tokens):
# tokens = tokenize(line)
# Search for defined macros
i = 0
while i < len(tokens):
if tokens[i].type == self.t_ID and tokens[i].value == 'defined':
j = i + 1
needparen = False
result = "0L"
while j < len(tokens):
if tokens[j].type in self.t_WS:
j += 1
continue
elif tokens[j].type == self.t_ID:
if tokens[j].value in self.macros:
result = "1L"
else:
result = "0L"
if not needparen: break
elif tokens[j].value == '(':
needparen = True
elif tokens[j].value == ')':
break
else:
self.error(self.source,tokens[i].lineno,"Malformed defined()")
j += 1
tokens[i].type = self.t_INTEGER
tokens[i].value = self.t_INTEGER_TYPE(result)
del tokens[i+1:j+1]
i += 1
tokens = self.expand_macros(tokens)
for i,t in enumerate(tokens):
if t.type == self.t_ID:
tokens[i] = copy.copy(t)
tokens[i].type = self.t_INTEGER
tokens[i].value = self.t_INTEGER_TYPE("0L")
elif t.type == self.t_INTEGER:
tokens[i] = copy.copy(t)
# Strip off any trailing suffixes
tokens[i].value = str(tokens[i].value)
while tokens[i].value[-1] not in "0123456789abcdefABCDEF":
tokens[i].value = tokens[i].value[:-1]
expr = "".join([str(x.value) for x in tokens])
expr = expr.replace("&&"," and ")
expr = expr.replace("||"," or ")
expr = expr.replace("!"," not ")
try:
result = eval(expr)
except StandardError:
self.error(self.source,tokens[0].lineno,"Couldn't evaluate expression")
result = 0
return result
# ----------------------------------------------------------------------
# parsegen()
#
# Parse an input string/
# ----------------------------------------------------------------------
def parsegen(self,input,source=None):
# Replace trigraph sequences
t = trigraph(input)
lines = self.group_lines(t)
if not source:
source = ""
self.define("__FILE__ \"%s\"" % source)
self.source = source
chunk = []
enable = True
iftrigger = False
ifstack = []
for x in lines:
for i,tok in enumerate(x):
if tok.type not in self.t_WS: break
if tok.value == '#':
# Preprocessor directive
for tok in x:
if tok in self.t_WS and '\n' in tok.value:
chunk.append(tok)
dirtokens = self.tokenstrip(x[i+1:])
if dirtokens:
name = dirtokens[0].value
args = self.tokenstrip(dirtokens[1:])
else:
name = ""
args = []
if name == 'define':
if enable:
for tok in self.expand_macros(chunk):
yield tok
chunk = []
self.define(args)
elif name == 'include':
if enable:
for tok in self.expand_macros(chunk):
yield tok
chunk = []
oldfile = self.macros['__FILE__']
for tok in self.include(args):
yield tok
self.macros['__FILE__'] = oldfile
self.source = source
elif name == 'undef':
if enable:
for tok in self.expand_macros(chunk):
yield tok
chunk = []
self.undef(args)
elif name == 'ifdef':
ifstack.append((enable,iftrigger))
if enable:
if not args[0].value in self.macros:
enable = False
iftrigger = False
else:
iftrigger = True
elif name == 'ifndef':
ifstack.append((enable,iftrigger))
if enable:
if args[0].value in self.macros:
enable = False
iftrigger = False
else:
iftrigger = True
elif name == 'if':
ifstack.append((enable,iftrigger))
if enable:
result = self.evalexpr(args)
if not result:
enable = False
iftrigger = False
else:
iftrigger = True
elif name == 'elif':
if ifstack:
if ifstack[-1][0]: # We only pay attention if outer "if" allows this
if enable: # If already true, we flip enable False
enable = False
elif not iftrigger: # If False, but not triggered yet, we'll check expression
result = self.evalexpr(args)
if result:
enable = True
iftrigger = True
else:
self.error(self.source,dirtokens[0].lineno,"Misplaced #elif")
elif name == 'else':
if ifstack:
if ifstack[-1][0]:
if enable:
enable = False
elif not iftrigger:
enable = True
iftrigger = True
else:
self.error(self.source,dirtokens[0].lineno,"Misplaced #else")
elif name == 'endif':
if ifstack:
enable,iftrigger = ifstack.pop()
else:
self.error(self.source,dirtokens[0].lineno,"Misplaced #endif")
else:
# Unknown preprocessor directive
pass
else:
# Normal text
if enable:
chunk.extend(x)
for tok in self.expand_macros(chunk):
yield tok
chunk = []
# ----------------------------------------------------------------------
# include()
#
# Implementation of file-inclusion
# ----------------------------------------------------------------------
def include(self,tokens):
# Try to extract the filename and then process an include file
if not tokens:
return
if tokens:
if tokens[0].value != '<' and tokens[0].type != self.t_STRING:
tokens = self.expand_macros(tokens)
if tokens[0].value == '<':
# Include <...>
i = 1
while i < len(tokens):
if tokens[i].value == '>':
break
i += 1
else:
print "Malformed #include <...>"
return
filename = "".join([x.value for x in tokens[1:i]])
path = self.path + [""] + self.temp_path
elif tokens[0].type == self.t_STRING:
filename = tokens[0].value[1:-1]
path = self.temp_path + [""] + self.path
else:
print "Malformed #include statement"
return
for p in path:
iname = os.path.join(p,filename)
try:
data = open(iname,"r").read()
dname = os.path.dirname(iname)
if dname:
self.temp_path.insert(0,dname)
for tok in self.parsegen(data,filename):
yield tok
if dname:
del self.temp_path[0]
break
except IOError,e:
pass
else:
print "Couldn't find '%s'" % filename
# ----------------------------------------------------------------------
# define()
#
# Define a new macro
# ----------------------------------------------------------------------
def define(self,tokens):
if isinstance(tokens,(str,unicode)):
tokens = self.tokenize(tokens)
linetok = tokens
try:
name = linetok[0]
if len(linetok) > 1:
mtype = linetok[1]
else:
mtype = None
if not mtype:
m = Macro(name.value,[])
self.macros[name.value] = m
elif mtype.type in self.t_WS:
# A normal macro
m = Macro(name.value,self.tokenstrip(linetok[2:]))
self.macros[name.value] = m
elif mtype.value == '(':
# A macro with arguments
tokcount, args, positions = self.collect_args(linetok[1:])
variadic = False
for a in args:
if variadic:
print "No more arguments may follow a variadic argument"
break
astr = "".join([str(_i.value) for _i in a])
if astr == "...":
variadic = True
a[0].type = self.t_ID
a[0].value = '__VA_ARGS__'
variadic = True
del a[1:]
continue
elif astr[-3:] == "..." and a[0].type == self.t_ID:
variadic = True
del a[1:]
# If, for some reason, "." is part of the identifier, strip off the name for the purposes
# of macro expansion
if a[0].value[-3:] == '...':
a[0].value = a[0].value[:-3]
continue
if len(a) > 1 or a[0].type != self.t_ID:
print "Invalid macro argument"
break
else:
mvalue = self.tokenstrip(linetok[1+tokcount:])
i = 0
while i < len(mvalue):
if i+1 < len(mvalue):
if mvalue[i].type in self.t_WS and mvalue[i+1].value == '##':
del mvalue[i]
continue
elif mvalue[i].value == '##' and mvalue[i+1].type in self.t_WS:
del mvalue[i+1]
i += 1
m = Macro(name.value,mvalue,[x[0].value for x in args],variadic)
self.macro_prescan(m)
self.macros[name.value] = m
else:
print "Bad macro definition"
except LookupError:
print "Bad macro definition"
# ----------------------------------------------------------------------
# undef()
#
# Undefine a macro
# ----------------------------------------------------------------------
def undef(self,tokens):
id = tokens[0].value
try:
del self.macros[id]
except LookupError:
pass
# ----------------------------------------------------------------------
# parse()
#
# Parse input text.
# ----------------------------------------------------------------------
def parse(self,input,source=None,ignore={}):
self.ignore = ignore
self.parser = self.parsegen(input,source)
# ----------------------------------------------------------------------
# token()
#
# Method to return individual tokens
# ----------------------------------------------------------------------
def token(self):
try:
while True:
tok = self.parser.next()
if tok.type not in self.ignore: return tok
except StopIteration:
self.parser = None
return None
if __name__ == '__main__':
import ply.lex as lex
lexer = lex.lex()
# Run a preprocessor
import sys
f = open(sys.argv[1])
input = f.read()
p = Preprocessor(lexer)
p.parse(input,sys.argv[1])
while True:
tok = p.token()
if not tok: break
print p.source, tok

133
ext/ply/ply/ctokens.py Normal file
View file

@ -0,0 +1,133 @@
# ----------------------------------------------------------------------
# ctokens.py
#
# Token specifications for symbols in ANSI C and C++. This file is
# meant to be used as a library in other tokenizers.
# ----------------------------------------------------------------------
# Reserved words
tokens = [
# Literals (identifier, integer constant, float constant, string constant, char const)
'ID', 'TYPEID', 'ICONST', 'FCONST', 'SCONST', 'CCONST',
# Operators (+,-,*,/,%,|,&,~,^,<<,>>, ||, &&, !, <, <=, >, >=, ==, !=)
'PLUS', 'MINUS', 'TIMES', 'DIVIDE', 'MOD',
'OR', 'AND', 'NOT', 'XOR', 'LSHIFT', 'RSHIFT',
'LOR', 'LAND', 'LNOT',
'LT', 'LE', 'GT', 'GE', 'EQ', 'NE',
# Assignment (=, *=, /=, %=, +=, -=, <<=, >>=, &=, ^=, |=)
'EQUALS', 'TIMESEQUAL', 'DIVEQUAL', 'MODEQUAL', 'PLUSEQUAL', 'MINUSEQUAL',
'LSHIFTEQUAL','RSHIFTEQUAL', 'ANDEQUAL', 'XOREQUAL', 'OREQUAL',
# Increment/decrement (++,--)
'PLUSPLUS', 'MINUSMINUS',
# Structure dereference (->)
'ARROW',
# Ternary operator (?)
'TERNARY',
# Delimeters ( ) [ ] { } , . ; :
'LPAREN', 'RPAREN',
'LBRACKET', 'RBRACKET',
'LBRACE', 'RBRACE',
'COMMA', 'PERIOD', 'SEMI', 'COLON',
# Ellipsis (...)
'ELLIPSIS',
]
# Operators
t_PLUS = r'\+'
t_MINUS = r'-'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_MODULO = r'%'
t_OR = r'\|'
t_AND = r'&'
t_NOT = r'~'
t_XOR = r'\^'
t_LSHIFT = r'<<'
t_RSHIFT = r'>>'
t_LOR = r'\|\|'
t_LAND = r'&&'
t_LNOT = r'!'
t_LT = r'<'
t_GT = r'>'
t_LE = r'<='
t_GE = r'>='
t_EQ = r'=='
t_NE = r'!='
# Assignment operators
t_EQUALS = r'='
t_TIMESEQUAL = r'\*='
t_DIVEQUAL = r'/='
t_MODEQUAL = r'%='
t_PLUSEQUAL = r'\+='
t_MINUSEQUAL = r'-='
t_LSHIFTEQUAL = r'<<='
t_RSHIFTEQUAL = r'>>='
t_ANDEQUAL = r'&='
t_OREQUAL = r'\|='
t_XOREQUAL = r'^='
# Increment/decrement
t_INCREMENT = r'\+\+'
t_DECREMENT = r'--'
# ->
t_ARROW = r'->'
# ?
t_TERNARY = r'\?'
# Delimeters
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_LBRACKET = r'\['
t_RBRACKET = r'\]'
t_LBRACE = r'\{'
t_RBRACE = r'\}'
t_COMMA = r','
t_PERIOD = r'\.'
t_SEMI = r';'
t_COLON = r':'
t_ELLIPSIS = r'\.\.\.'
# Identifiers
t_ID = r'[A-Za-z_][A-Za-z0-9_]*'
# Integer literal
t_INTEGER = r'\d+([uU]|[lL]|[uU][lL]|[lL][uU])?'
# Floating literal
t_FLOAT = r'((\d+)(\.\d+)(e(\+|-)?(\d+))? | (\d+)e(\+|-)?(\d+))([lL]|[fF])?'
# String literal
t_STRING = r'\"([^\\\n]|(\\.))*?\"'
# Character constant 'c' or L'c'
t_CHARACTER = r'(L)?\'([^\\\n]|(\\.))*?\''
# Comment (C-Style)
def t_COMMENT(t):
r'/\*(.|\n)*?\*/'
t.lexer.lineno += t.value.count('\n')
return t
# Comment (C++-Style)
def t_CPPCOMMENT(t):
r'//.*\n'
t.lexer.lineno += 1
return t

984
ext/ply/ply/lex.py
View file

File diff suppressed because it is too large Load diff

4374
ext/ply/ply/yacc.py
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File diff suppressed because it is too large Load diff

25
ext/ply/setup.py
View file

@ -1,23 +1,22 @@
from distutils.core import setup
try:
from setuptools import setup
except ImportError:
from distutils.core import setup
setup(name = "ply",
description="Python Lex & Yacc",
long_description = """
PLY is yet another implementation of lex and yacc for Python. Although several other
parsing tools are available for Python, there are several reasons why you might
want to take a look at PLY:
PLY is yet another implementation of lex and yacc for Python. Some notable
features include the fact that its implemented entirely in Python and it
uses LALR(1) parsing which is efficient and well suited for larger grammars.
It's implemented entirely in Python.
PLY provides most of the standard lex/yacc features including support for empty
productions, precedence rules, error recovery, and support for ambiguous grammars.
It uses LR-parsing which is reasonably efficient and well suited for larger grammars.
PLY provides most of the standard lex/yacc features including support for empty
productions, precedence rules, error recovery, and support for ambiguous grammars.
PLY is extremely easy to use and provides very extensive error checking.
PLY is extremely easy to use and provides very extensive error checking.
""",
license="""Lesser GPL (LGPL)""",
version = "2.3",
license="""BSD""",
version = "3.2",
author = "David Beazley",
author_email = "dave@dabeaz.com",
maintainer = "David Beazley",

10
ext/ply/test/calclex.py
View file

@ -3,7 +3,7 @@
# -----------------------------------------------------------------------------
import sys
sys.path.append("..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = (
@ -28,7 +28,7 @@ def t_NUMBER(t):
try:
t.value = int(t.value)
except ValueError:
print "Integer value too large", t.value
print("Integer value too large %s" % t.value)
t.value = 0
return t
@ -37,11 +37,11 @@ t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lineno += t.value.count("\n")
def t_error(t):
print "Illegal character '%s'" % t.value[0]
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
lex.lex()

2
ext/ply/test/cleanup.sh Normal file → Executable file
View file

@ -1,4 +1,4 @@
#!/bin/sh
rm -f *~ *.pyc *.dif *.out
rm -f *~ *.pyc *.pyo *.dif *.out

54
ext/ply/test/lex_closure.py Normal file
View file

@ -0,0 +1,54 @@
# -----------------------------------------------------------------------------
# lex_closure.py
# -----------------------------------------------------------------------------
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = (
'NAME','NUMBER',
'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
'LPAREN','RPAREN',
)
def make_calc():
# Tokens
t_PLUS = r'\+'
t_MINUS = r'-'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_EQUALS = r'='
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print("Integer value too large %s" % t.value)
t.value = 0
return t
t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
return lex.lex()
make_calc()
lex.runmain(data="3+4")

1
ext/ply/test/lex_doc1.exp
View file

@ -1 +0,0 @@
./lex_doc1.py:18: No regular expression defined for rule 't_NUMBER'

8
ext/ply/test/lex_doc1.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_doc1.py
#
# Missing documentation string
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -21,10 +21,6 @@ def t_NUMBER(t):
def t_error(t):
pass
import sys
sys.tracebacklimit = 0
lex.lex()

2
ext/ply/test/lex_dup1.exp
View file

@ -1,2 +0,0 @@
./lex_dup1.py:20: Rule t_NUMBER redefined. Previously defined on line 18
SyntaxError: lex: Unable to build lexer.

6
ext/ply/test/lex_dup1.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_dup1.py
#
# Duplicated rule specifiers
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -22,7 +22,7 @@ t_NUMBER = r'\d+'
def t_error(t):
pass
sys.tracebacklimit = 0
lex.lex()

2
ext/ply/test/lex_dup2.exp
View file

@ -1,2 +0,0 @@
./lex_dup2.py:22: Rule t_NUMBER redefined. Previously defined on line 18
SyntaxError: lex: Unable to build lexer.

6
ext/ply/test/lex_dup2.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_dup2.py
#
# Duplicated rule specifiers
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -26,7 +26,7 @@ def t_NUMBER(t):
def t_error(t):
pass
sys.tracebacklimit = 0
lex.lex()

2
ext/ply/test/lex_dup3.exp
View file

@ -1,2 +0,0 @@
./lex_dup3.py:20: Rule t_NUMBER redefined. Previously defined on line 18
SyntaxError: lex: Unable to build lexer.

6
ext/ply/test/lex_dup3.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_dup3.py
#
# Duplicated rule specifiers
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -24,7 +24,7 @@ def t_NUMBER(t):
def t_error(t):
pass
sys.tracebacklimit = 0
lex.lex()

1
ext/ply/test/lex_empty.exp
View file

@ -1 +0,0 @@
SyntaxError: lex: no rules of the form t_rulename are defined.

6
ext/ply/test/lex_empty.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_empty.py
#
# No rules defined
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -13,7 +13,7 @@ tokens = [
"NUMBER",
]
sys.tracebacklimit = 0
lex.lex()

1
ext/ply/test/lex_error1.exp
View file

@ -1 +0,0 @@
lex: Warning. no t_error rule is defined.

6
ext/ply/test/lex_error1.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_error1.py
#
# Missing t_error() rule
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -17,7 +17,7 @@ t_PLUS = r'\+'
t_MINUS = r'-'
t_NUMBER = r'\d+'
sys.tracebacklimit = 0
lex.lex()

1
ext/ply/test/lex_error2.exp
View file

@ -1 +0,0 @@
SyntaxError: lex: Rule 't_error' must be defined as a function

6
ext/ply/test/lex_error2.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_error2.py
#
# t_error defined, but not function
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -19,7 +19,7 @@ t_NUMBER = r'\d+'
t_error = "foo"
sys.tracebacklimit = 0
lex.lex()

2
ext/ply/test/lex_error3.exp
View file

@ -1,2 +0,0 @@
./lex_error3.py:20: Rule 't_error' requires an argument.
SyntaxError: lex: Unable to build lexer.

6
ext/ply/test/lex_error3.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_error3.py
#
# t_error defined as function, but with wrong # args
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -20,7 +20,7 @@ t_NUMBER = r'\d+'
def t_error():
pass
sys.tracebacklimit = 0
lex.lex()

2
ext/ply/test/lex_error4.exp
View file

@ -1,2 +0,0 @@
./lex_error4.py:20: Rule 't_error' has too many arguments.
SyntaxError: lex: Unable to build lexer.

6
ext/ply/test/lex_error4.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_error4.py
#
# t_error defined as function, but too many args
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -20,7 +20,7 @@ t_NUMBER = r'\d+'
def t_error(t,s):
pass
sys.tracebacklimit = 0
lex.lex()

3
ext/ply/test/lex_hedit.exp
View file

@ -1,3 +0,0 @@
(H_EDIT_DESCRIPTOR,'abc',1,0)
(H_EDIT_DESCRIPTOR,'abcdefghij',1,6)
(H_EDIT_DESCRIPTOR,'xy',1,20)

12
ext/ply/test/lex_hedit.py
View file

@ -14,7 +14,7 @@
# such tokens
# -----------------------------------------------------------------------------
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -29,16 +29,16 @@ def t_H_EDIT_DESCRIPTOR(t):
r"\d+H.*" # This grabs all of the remaining text
i = t.value.index('H')
n = eval(t.value[:i])
# Adjust the tokenizing position
t.lexer.lexpos -= len(t.value) - (i+1+n)
t.value = t.value[i+1:i+1+n]
return t
return t
def t_error(t):
print "Illegal character '%s'" % t.value[0]
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
lex.lex()
lex.runmain(data="3Habc 10Habcdefghij 2Hxy")

7
ext/ply/test/lex_ignore.exp
View file

@ -1,7 +0,0 @@
./lex_ignore.py:20: Rule 't_ignore' must be defined as a string.
Traceback (most recent call last):
File "./lex_ignore.py", line 29, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

4
ext/ply/test/lex_ignore.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_ignore.py
#
# Improperly specific ignore declaration
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex

1
ext/ply/test/lex_ignore2.exp
View file

@ -1 +0,0 @@
lex: Warning. t_ignore contains a literal backslash '\'

6
ext/ply/test/lex_ignore2.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_ignore2.py
#
# ignore declaration as a raw string
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -22,7 +22,7 @@ t_ignore = r' \t'
def t_error(t):
pass
import sys
lex.lex()

25
ext/ply/test/lex_literal1.py Normal file
View file

@ -0,0 +1,25 @@
# lex_literal1.py
#
# Bad literal specification
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
"NUMBER",
]
literals = ["+","-","**"]
def t_NUMBER(t):
r'\d+'
return t
def t_error(t):
pass
lex.lex()

25
ext/ply/test/lex_literal2.py Normal file
View file

@ -0,0 +1,25 @@
# lex_literal2.py
#
# Bad literal specification
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
"NUMBER",
]
literals = 23
def t_NUMBER(t):
r'\d+'
return t
def t_error(t):
pass
lex.lex()

27
ext/ply/test/lex_many_tokens.py Normal file
View file

@ -0,0 +1,27 @@
# lex_many_tokens.py
#
# Test lex's ability to handle a large number of tokens (beyond the
# 100-group limit of the re module)
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = ["TOK%d" % i for i in range(1000)]
for tok in tokens:
if sys.version_info[0] < 3:
exec("t_%s = '%s:'" % (tok,tok))
else:
exec("t_%s = '%s:'" % (tok,tok), globals())
t_ignore = " \t"
def t_error(t):
pass
lex.lex(optimize=1,lextab="manytab")
lex.runmain(data="TOK34: TOK143: TOK269: TOK372: TOK452: TOK561: TOK999:")

10
ext/ply/test/lex_module.py Normal file
View file

@ -0,0 +1,10 @@
# lex_module.py
#
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
import lex_module_import
lex.lex(module=lex_module_import)
lex.runmain(data="3+4")

42
ext/ply/test/lex_module_import.py Normal file
View file

@ -0,0 +1,42 @@
# -----------------------------------------------------------------------------
# lex_module_import.py
#
# A lexer defined in a module, but built in lex_module.py
# -----------------------------------------------------------------------------
tokens = (
'NAME','NUMBER',
'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
'LPAREN','RPAREN',
)
# Tokens
t_PLUS = r'\+'
t_MINUS = r'-'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_EQUALS = r'='
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print("Integer value too large %s" % t.value)
t.value = 0
return t
t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)

30
ext/ply/test/lex_nowarn.py
View file

@ -1,30 +0,0 @@
# lex_token.py
#
# Missing t_error() rule
import sys
sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
"PLUS",
"MINUS",
"NUMBER",
"NUMBER",
]
states = (('foo','exclusive'),)
t_ignore = ' \t'
t_PLUS = r'\+'
t_MINUS = r'-'
t_NUMBER = r'\d+'
t_foo_NUMBER = r'\d+'
sys.tracebacklimit = 0
lex.lex(nowarn=1)

55
ext/ply/test/lex_object.py Normal file
View file

@ -0,0 +1,55 @@
# -----------------------------------------------------------------------------
# lex_object.py
# -----------------------------------------------------------------------------
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
class CalcLexer:
tokens = (
'NAME','NUMBER',
'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
'LPAREN','RPAREN',
)
# Tokens
t_PLUS = r'\+'
t_MINUS = r'-'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_EQUALS = r'='
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(self,t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print("Integer value too large %s" % t.value)
t.value = 0
return t
t_ignore = " \t"
def t_newline(self,t):
r'\n+'
t.lineno += t.value.count("\n")
def t_error(self,t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
calc = CalcLexer()
# Build the lexer
lex.lex(object=calc)
lex.runmain(data="3+4")

54
ext/ply/test/lex_opt_alias.py Normal file
View file

@ -0,0 +1,54 @@
# -----------------------------------------------------------------------------
# lex_opt_alias.py
#
# Tests ability to match up functions with states, aliases, and
# lexing tables.
# -----------------------------------------------------------------------------
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
tokens = (
'NAME','NUMBER',
)
states = (('instdef','inclusive'),('spam','exclusive'))
literals = ['=','+','-','*','/', '(',')']
# Tokens
def t_instdef_spam_BITS(t):
r'[01-]+'
return t
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def NUMBER(t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print("Integer value too large %s" % t.value)
t.value = 0
return t
t_ANY_NUMBER = NUMBER
t_ignore = " \t"
t_spam_ignore = t_ignore
def t_newline(t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
t_spam_error = t_error
# Build the lexer
import ply.lex as lex
lex.lex(optimize=1,lextab="aliastab")
lex.runmain(data="3+4")

50
ext/ply/test/lex_optimize.py Normal file
View file

@ -0,0 +1,50 @@
# -----------------------------------------------------------------------------
# lex_optimize.py
# -----------------------------------------------------------------------------
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = (
'NAME','NUMBER',
'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
'LPAREN','RPAREN',
)
# Tokens
t_PLUS = r'\+'
t_MINUS = r'-'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_EQUALS = r'='
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print("Integer value too large %s" % t.value)
t.value = 0
return t
t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
lex.lex(optimize=1)
lex.runmain(data="3+4")

50
ext/ply/test/lex_optimize2.py Normal file
View file

@ -0,0 +1,50 @@
# -----------------------------------------------------------------------------
# lex_optimize2.py
# -----------------------------------------------------------------------------
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = (
'NAME','NUMBER',
'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
'LPAREN','RPAREN',
)
# Tokens
t_PLUS = r'\+'
t_MINUS = r'-'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_EQUALS = r'='
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print("Integer value too large %s" % t.value)
t.value = 0
return t
t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
lex.lex(optimize=1,lextab="opt2tab")
lex.runmain(data="3+4")

52
ext/ply/test/lex_optimize3.py Normal file
View file

@ -0,0 +1,52 @@
# -----------------------------------------------------------------------------
# lex_optimize3.py
#
# Writes table in a subdirectory structure.
# -----------------------------------------------------------------------------
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = (
'NAME','NUMBER',
'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
'LPAREN','RPAREN',
)
# Tokens
t_PLUS = r'\+'
t_MINUS = r'-'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_EQUALS = r'='
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_NUMBER(t):
r'\d+'
try:
t.value = int(t.value)
except ValueError:
print("Integer value too large %s" % t.value)
t.value = 0
return t
t_ignore = " \t"
def t_newline(t):
r'\n+'
t.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
lex.lex(optimize=1,lextab="lexdir.sub.calctab",outputdir="lexdir/sub")
lex.runmain(data="3+4")

7
ext/ply/test/lex_re1.exp
View file

@ -1,7 +0,0 @@
lex: Invalid regular expression for rule 't_NUMBER'. unbalanced parenthesis
Traceback (most recent call last):
File "./lex_re1.py", line 25, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

6
ext/ply/test/lex_re1.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_re1.py
#
# Bad regular expression in a string
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -20,7 +20,7 @@ t_NUMBER = r'(\d+'
def t_error(t):
pass
import sys
lex.lex()

7
ext/ply/test/lex_re2.exp
View file

@ -1,7 +0,0 @@
lex: Regular expression for rule 't_PLUS' matches empty string.
Traceback (most recent call last):
File "./lex_re2.py", line 25, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

6
ext/ply/test/lex_re2.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_re2.py
#
# Regular expression rule matches empty string
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -20,7 +20,7 @@ t_NUMBER = r'(\d+)'
def t_error(t):
pass
import sys
lex.lex()

8
ext/ply/test/lex_re3.exp
View file

@ -1,8 +0,0 @@
lex: Invalid regular expression for rule 't_POUND'. unbalanced parenthesis
lex: Make sure '#' in rule 't_POUND' is escaped with '\#'.
Traceback (most recent call last):
File "./lex_re3.py", line 27, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

6
ext/ply/test/lex_re3.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_re3.py
#
# Regular expression rule matches empty string
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -22,7 +22,7 @@ t_POUND = r'#'
def t_error(t):
pass
import sys
lex.lex()

2
ext/ply/test/lex_rule1.exp
View file

@ -1,2 +0,0 @@
lex: t_NUMBER not defined as a function or string
SyntaxError: lex: Unable to build lexer.

8
ext/ply/test/lex_rule1.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_rule1.py
#
# Rule defined as some other type
# Rule function with incorrect number of arguments
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -20,7 +20,7 @@ t_NUMBER = 1
def t_error(t):
pass
sys.tracebacklimit = 0
lex.lex()

29
ext/ply/test/lex_rule2.py Normal file
View file

@ -0,0 +1,29 @@
# lex_rule2.py
#
# Rule function with incorrect number of arguments
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
"PLUS",
"MINUS",
"NUMBER",
]
t_PLUS = r'\+'
t_MINUS = r'-'
def t_NUMBER():
r'\d+'
return t
def t_error(t):
pass
lex.lex()

27
ext/ply/test/lex_rule3.py Normal file
View file

@ -0,0 +1,27 @@
# lex_rule3.py
#
# Rule function with incorrect number of arguments
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
"PLUS",
"MINUS",
"NUMBER",
]
t_PLUS = r'\+'
t_MINUS = r'-'
def t_NUMBER(t,s):
r'\d+'
return t
def t_error(t):
pass
lex.lex()

7
ext/ply/test/lex_state1.exp
View file

@ -1,7 +0,0 @@
lex: states must be defined as a tuple or list.
Traceback (most recent call last):
File "./lex_state1.py", line 38, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

10
ext/ply/test/lex_state1.py
View file

@ -3,11 +3,11 @@
# Bad state declaration
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
tokens = [
"PLUS",
"MINUS",
"NUMBER",
@ -23,17 +23,17 @@ t_NUMBER = r'\d+'
def t_comment(t):
r'/\*'
t.lexer.begin('comment')
print "Entering comment state"
print("Entering comment state")
def t_comment_body_part(t):
r'(.|\n)*\*/'
print "comment body", t
print("comment body %s" % t)
t.lexer.begin('INITIAL')
def t_error(t):
pass
import sys
lex.lex()

8
ext/ply/test/lex_state2.exp
View file

@ -1,8 +0,0 @@
lex: invalid state specifier 'comment'. Must be a tuple (statename,'exclusive|inclusive')
lex: invalid state specifier 'example'. Must be a tuple (statename,'exclusive|inclusive')
Traceback (most recent call last):
File "./lex_state2.py", line 38, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

10
ext/ply/test/lex_state2.py
View file

@ -3,11 +3,11 @@
# Bad state declaration
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
tokens = [
"PLUS",
"MINUS",
"NUMBER",
@ -23,17 +23,17 @@ t_NUMBER = r'\d+'
def t_comment(t):
r'/\*'
t.lexer.begin('comment')
print "Entering comment state"
print("Entering comment state")
def t_comment_body_part(t):
r'(.|\n)*\*/'
print "comment body", t
print("comment body %s" % t)
t.lexer.begin('INITIAL')
def t_error(t):
pass
import sys
lex.lex()

8
ext/ply/test/lex_state3.exp
View file

@ -1,8 +0,0 @@
lex: state name 1 must be a string
lex: No rules defined for state 'example'
Traceback (most recent call last):
File "./lex_state3.py", line 40, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

12
ext/ply/test/lex_state3.py
View file

@ -1,13 +1,13 @@
# lex_state2.py
# lex_state3.py
#
# Bad state declaration
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
tokens = [
"PLUS",
"MINUS",
"NUMBER",
@ -25,17 +25,17 @@ t_NUMBER = r'\d+'
def t_comment(t):
r'/\*'
t.lexer.begin('comment')
print "Entering comment state"
print("Entering comment state")
def t_comment_body_part(t):
r'(.|\n)*\*/'
print "comment body", t
print("comment body %s" % t)
t.lexer.begin('INITIAL')
def t_error(t):
pass
import sys
lex.lex()

7
ext/ply/test/lex_state4.exp
View file

@ -1,7 +0,0 @@
lex: state type for state comment must be 'inclusive' or 'exclusive'
Traceback (most recent call last):
File "./lex_state4.py", line 39, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

14
ext/ply/test/lex_state4.py
View file

@ -1,19 +1,19 @@
# lex_state2.py
# lex_state4.py
#
# Bad state declaration
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
tokens = [
"PLUS",
"MINUS",
"NUMBER",
]
comment = 1
states = (('comment', 'exclsive'),)
t_PLUS = r'\+'
@ -24,17 +24,17 @@ t_NUMBER = r'\d+'
def t_comment(t):
r'/\*'
t.lexer.begin('comment')
print "Entering comment state"
print("Entering comment state")
def t_comment_body_part(t):
r'(.|\n)*\*/'
print "comment body", t
print("comment body %s" % t)
t.lexer.begin('INITIAL')
def t_error(t):
pass
import sys
lex.lex()

7
ext/ply/test/lex_state5.exp
View file

@ -1,7 +0,0 @@
lex: state 'comment' already defined.
Traceback (most recent call last):
File "./lex_state5.py", line 40, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

12
ext/ply/test/lex_state5.py
View file

@ -1,19 +1,18 @@
# lex_state2.py
# lex_state5.py
#
# Bad state declaration
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
tokens = [
"PLUS",
"MINUS",
"NUMBER",
]
comment = 1
states = (('comment', 'exclusive'),
('comment', 'exclusive'))
@ -25,17 +24,16 @@ t_NUMBER = r'\d+'
def t_comment(t):
r'/\*'
t.lexer.begin('comment')
print "Entering comment state"
print("Entering comment state")
def t_comment_body_part(t):
r'(.|\n)*\*/'
print "comment body", t
print("comment body %s" % t)
t.lexer.begin('INITIAL')
def t_error(t):
pass
import sys
lex.lex()

1
ext/ply/test/lex_state_noerror.exp
View file

@ -1 +0,0 @@
lex: Warning. no error rule is defined for exclusive state 'comment'

12
ext/ply/test/lex_state_noerror.py
View file

@ -1,19 +1,18 @@
# lex_state2.py
# lex_state_noerror.py
#
# Declaration of a state for which no rules are defined
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
tokens = [
"PLUS",
"MINUS",
"NUMBER",
]
comment = 1
states = (('comment', 'exclusive'),)
t_PLUS = r'\+'
@ -24,17 +23,16 @@ t_NUMBER = r'\d+'
def t_comment(t):
r'/\*'
t.lexer.begin('comment')
print "Entering comment state"
print("Entering comment state")
def t_comment_body_part(t):
r'(.|\n)*\*/'
print "comment body", t
print("comment body %s" % t)
t.lexer.begin('INITIAL')
def t_error(t):
pass
import sys
lex.lex()

7
ext/ply/test/lex_state_norule.exp
View file

@ -1,7 +0,0 @@
lex: No rules defined for state 'example'
Traceback (most recent call last):
File "./lex_state_norule.py", line 40, in <module>
lex.lex()
File "../ply/lex.py", line 759, in lex
raise SyntaxError,"lex: Unable to build lexer."
SyntaxError: lex: Unable to build lexer.

12
ext/ply/test/lex_state_norule.py
View file

@ -1,19 +1,18 @@
# lex_state2.py
# lex_state_norule.py
#
# Declaration of a state for which no rules are defined
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
tokens = [
"PLUS",
"MINUS",
"NUMBER",
]
comment = 1
states = (('comment', 'exclusive'),
('example', 'exclusive'))
@ -25,17 +24,16 @@ t_NUMBER = r'\d+'
def t_comment(t):
r'/\*'
t.lexer.begin('comment')
print "Entering comment state"
print("Entering comment state")
def t_comment_body_part(t):
r'(.|\n)*\*/'
print "comment body", t
print("comment body %s" % t)
t.lexer.begin('INITIAL')
def t_error(t):
pass
import sys
lex.lex()

7
ext/ply/test/lex_state_try.exp
View file

@ -1,7 +0,0 @@
(NUMBER,'3',1,0)
(PLUS,'+',1,2)
(NUMBER,'4',1,4)
Entering comment state
comment body LexToken(body_part,'This is a comment */',1,9)
(PLUS,'+',1,30)
(NUMBER,'10',1,32)

13
ext/ply/test/lex_state_try.py
View file

@ -1,19 +1,18 @@
# lex_state2.py
# lex_state_try.py
#
# Declaration of a state for which no rules are defined
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = [
tokens = [
"PLUS",
"MINUS",
"NUMBER",
]
comment = 1
states = (('comment', 'exclusive'),)
t_PLUS = r'\+'
@ -26,11 +25,11 @@ t_ignore = " \t"
def t_comment(t):
r'/\*'
t.lexer.begin('comment')
print "Entering comment state"
print("Entering comment state")
def t_comment_body_part(t):
r'(.|\n)*\*/'
print "comment body", t
print("comment body %s" % t)
t.lexer.begin('INITIAL')
def t_error(t):
@ -39,8 +38,6 @@ def t_error(t):
t_comment_error = t_error
t_comment_ignore = t_ignore
import sys
lex.lex()
data = "3 + 4 /* This is a comment */ + 10"

1
ext/ply/test/lex_token1.exp
View file

@ -1 +0,0 @@
SyntaxError: lex: module does not define 'tokens'

6
ext/ply/test/lex_token1.py
View file

@ -1,9 +1,9 @@
# lex_token.py
# lex_token1.py
#
# Tests for absence of tokens variable
import sys
sys.path.insert(0,"..")
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
@ -14,8 +14,6 @@ t_NUMBER = r'\d+'
def t_error(t):
pass
sys.tracebacklimit = 0
lex.lex()

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