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##############################################################################
#
# Copyright (c) 1996-1998, Digital Creations, Fredericksburg, VA, USA.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# o Redistributions of source code must retain the above copyright
# notice, this list of conditions, and the disclaimer that follows.
#
# o 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.
#
# o All advertising materials mentioning features or use of this
# software must display the following acknowledgement:
#
# This product includes software developed by Digital Creations
# and its contributors.
#
# o Neither the name of Digital Creations nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
#
# THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS 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 DIGITAL
# CREATIONS 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.
#
#
# If you have questions regarding this software, contact:
#
# Digital Creations, L.C.
# 910 Princess Ann Street
# Fredericksburge, Virginia 22401
#
# info@digicool.com
#
# (540) 371-6909
#
##############################################################################
"$Id: gparse.py,v 1.7 1998/09/14 22:19:56 jim Exp $"
import sys, parser, symbol, token
from symbol import test, suite, argument, arith_expr, shift_expr
from symbol import subscriptlist, subscript, comparison, trailer, xor_expr
from symbol import term, not_test, factor, atom, expr, arglist
from symbol import power, and_test, and_expr
from token import STAR, NAME, RPAR, LPAR, NUMBER, DOT, STRING, COMMA
from token import ISTERMINAL, LSQB, COLON
from parser import sequence2ast, compileast, ast2list
ParseError='Expression Parse Error'
def munge(ast):
if ISTERMINAL(ast[0]): return
else:
if ast[0]==term and len(ast) > 2:
keep_going=1
while keep_going:
keep_going=0
start=2
for i in range(start,len(ast)-1):
if ast[i][0]==STAR:
ast[i-1:i+2]=[multi_munge(ast[i-1:i+2])]
keep_going=1
break
for a in ast[1:]: munge(a)
elif ast[0]==power:
keep_going=1
while keep_going:
keep_going=0
start=2
for i in range(start,len(ast)):
a=ast[i]
if a[0]==trailer:
if a[1][0]==DOT:
ast[:i+1]=dot_munge(ast,i)
keep_going=1
start=3
break
if a[1][0]==LSQB:
if (a[2][0] != subscriptlist or
a[2][1][0] != subscript):
raise ParseError, (
'Unexpected form after left square brace')
slist=a[2]
if len(slist)==2:
# One subscript, check for range and ...
sub=slist[1]
if sub[1][0]==DOT:
raise ParseError, (
'ellipses are not supported')
l=len(sub)
if l < 3 and sub[1][0] != COLON:
ast[:i+1]=item_munge(ast, i)
elif l < 5: ast[:i+1]=slice_munge(ast, i)
else: raise ParseError, 'Invalid slice'
else: ast[:i+1]=item_munge(ast, i)
keep_going=1
start=3
break
for a in ast[1:]: munge(a)
else:
for a in ast[1:]: munge(a)
return ast
def slice_munge(ast, i):
# Munge a slice access into a function call
# Note that we must account for a[:], a[b:], a[:b], and a[b:c]
name=ast[i][2][1]
args=[arglist]
append=args.append
a=(factor, (power, (atom, (NAME, '_vars'))))
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, a)))))))))))
append(a)
append([COMMA,','])
a=ast[:i]
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, (factor, a))))))))))))
append(a)
sub=ast[i][2][1]
l=len(sub)
if sub[1][0]==COLON:
if l==3:
append([COMMA,','])
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, (factor, (power, (atom, (NUMBER, '0')))))))))))))))
append(a)
append([COMMA,','])
append([argument, sub[2]])
else:
append([COMMA,','])
append([argument, sub[1]])
if l==4:
append([COMMA,','])
append([argument, sub[3]])
return [power, [atom, [NAME, '__guarded_getslice__']],
[trailer, [LPAR, '('], args, [RPAR, ')'],
]
]
def item_munge(ast, i):
# Munge an item access into a function call
name=ast[i][2][1]
args=[arglist]
append=args.append
a=(factor, (power, (atom, (NAME, '_vars'))))
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, a)))))))))))
append(a)
append([COMMA,','])
a=ast[:i]
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, (factor, a))))))))))))
append(a)
append([COMMA,','])
for sub in ast[i][2][1:]:
if sub[0]==COMMA: append(sub)
else:
if len(sub) != 2: raise ParseError, 'Invalid slice in subscript'
append([argument, sub[1]])
return [power, [atom, [NAME, '__guarded_getitem__']],
[trailer, [LPAR, '('], args, [RPAR, ')'],
]
]
def dot_munge(ast, i):
# Munge an attribute access into a function call
name=ast[i][2][1]
args=[arglist]
append=args.append
a=(factor, (power, (atom, (NAME, '_vars'))))
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, a)))))))))))
append(a)
append([COMMA,','])
a=ast[:i]
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, (factor, a))))))))))))
append(a)
append([COMMA,','])
a=(factor, (power, (atom, (STRING, `name`))))
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, a)))))))))))
append(a)
return [power, [atom, [NAME, '__guarded_getattr__']],
[trailer, [LPAR, '('], args, [RPAR, ')']],
]
def multi_munge(ast):
# Munge a multiplication into a function call: __guarded_mul__
args=[arglist]
append=args.append
a=(factor, (power, (atom, (NAME, '_vars'))))
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, a)))))))))))
append(a)
append([COMMA,','])
for a in ast:
if a[0]==STAR: args.append([COMMA,','])
else:
a=(argument, (test, (and_test, (not_test, (comparison,
(expr, (xor_expr, (and_expr, (shift_expr, (arith_expr,
(term, a)))))))))))
append(a)
return [factor, [power,
[atom, [NAME, '__guarded_mul__']],
[trailer, [LPAR, '('], args, [RPAR, ')'],
]]]
def compile(src, file_name, ctype):
if ctype=='eval': ast=parser.expr(src)
elif ctype=='exec': ast=parser.suite(src)
l=ast2list(ast)
l=munge(l)
ast=sequence2ast(l)
return parser.compileast(ast, file_name)
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