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-PLY (Python Lex-Yacc)                   Version 2.2  (November 1, 2006)
-
-David M. Beazley (dave@dabeaz.com)
-
-Copyright (C) 2001-2006   David M. Beazley
-
-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.
-
-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.
-
-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:
-
- -  The tools are very closely modeled after traditional lex/yacc.
-    If you know how to use these tools in C, you will find PLY
-    to be similar.
-
- -  PLY provides *very* extensive error reporting and diagnostic 
-    information to assist in parser construction.  The original
-    implementation was developed for instructional purposes.  As
-    a result, the system tries to identify the most common types
-    of errors made by novice users.  
-
- -  PLY provides full support for empty productions, error recovery,
-    precedence specifiers, and moderately ambiguous grammars.
-
- -  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. 
-
- -  PLY uses Python introspection features to build lexers and parsers.  
-    This greatly simplifies the task of parser construction since it reduces 
-    the number of files and eliminates the need to run a separate lex/yacc 
-    tool before running your program.
-
- -  PLY can be used to build parsers for "real" 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 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.
-
-How to Use
-==========
-
-PLY consists of two files : lex.py and yacc.py.  These are contained
-within the 'ply' directory which may also be used as a Python package.
-To use PLY, simply copy the 'ply' directory to your project and import
-lex and yacc from the associated 'ply' package.  For example:
-
-     import ply.lex as lex
-     import ply.yacc as yacc
-
-Alternatively, you can copy just the files lex.py and yacc.py
-individually and use them as modules.  For example:
-
-     import lex
-     import yacc
-
-The file setup.py can be used to install ply using distutils.
-
-The file doc/ply.html contains complete documentation on how to use
-the system.
-
-The example directory contains several different examples including a
-PLY specification for ANSI C as given in K&R 2nd Ed.   
-
-A simple example is found at the end of this document
-
-Requirements
-============
-PLY requires the use of Python 2.0 or greater.  It should work on
-just about any platform.  PLY has been tested with both CPython and
-Jython.  However, it does not work with IronPython.
-
-Resources
-=========
-More information about PLY can be obtained on the PLY webpage at:
-
-     http://www.dabeaz.com/ply
-
-For a detailed overview of parsing theory, consult the excellent
-book "Compilers : Principles, Techniques, and Tools" by Aho, Sethi, and
-Ullman.  The topics found in "Lex & Yacc" by Levine, Mason, and Brown
-may also be useful.
-
-A Google group for PLY can be found at
-
-     http://groups.google.com/group/ply-hack
-
-Acknowledgments
-===============
-A special thanks is in order for all of the students in CS326 who
-suffered through about 25 different versions of these tools :-).
-
-The CHANGES file acknowledges those who have contributed patches.
-
-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
-========================
-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
-
-Example
-=======
-
-Here is a simple example showing a PLY implementation of a calculator
-with variables.
-
-# -----------------------------------------------------------------------------
-# calc.py
-#
-# A simple calculator with variables.
-# -----------------------------------------------------------------------------
-
-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", t.value
-        t.value = 0
-    return t
-
-# Ignored characters
-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()
-
-# Precedence rules for the arithmetic operators
-precedence = (
-    ('left','PLUS','MINUS'),
-    ('left','TIMES','DIVIDE'),
-    ('right','UMINUS'),
-    )
-
-# dictionary of names (for storing variables)
-names = { }
-
-def p_statement_assign(p):
-    'statement : NAME EQUALS expression'
-    names[p[1]] = p[3]
-
-def p_statement_expr(p):
-    'statement : expression'
-    print p[1]
-
-def p_expression_binop(p):
-    '''expression : expression PLUS expression
-                  | expression MINUS expression
-                  | expression TIMES expression
-                  | expression DIVIDE 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 : MINUS expression %prec UMINUS'
-    p[0] = -p[2]
-
-def p_expression_group(p):
-    'expression : LPAREN expression RPAREN'
-    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):
-    print "Syntax error at '%s'" % p.value
-
-import ply.yacc as yacc
-yacc.yacc()
-
-while 1:
-    try:
-        s = raw_input('calc > ')
-    except EOFError:
-        break
-    yacc.parse(s)
-
-
-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.
-
-In addition there is a Google group for discussing PLY related issues at
-
-    http://groups.google.com/group/ply-hack
- 
--- Dave
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