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# Copyright (c) 2003 Sylvain Thenault (thenault@nerim.net)
# Copyright (c) 2003 Logilab
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""Some usefull functions to manipulate ast tuples
"""
__author__ = u"Sylvain Thenault"
import symbol
import token
from types import TupleType
def debuild(ast_tuple):
"""
reverse ast_tuple to string
"""
if type(ast_tuple[1]) is TupleType:
result = ''
for child in ast_tuple[1:]:
result = '%s%s' % (result, debuild(child))
return result
else:
return ast_tuple[1]
def clean(ast_tuple):
"""
reverse ast tuple to a list of tokens
merge sequences (token.NAME, token.DOT, token.NAME)
"""
result = []
last = None
for couple in _clean(ast_tuple):
if couple[0] == token.NAME and last == token.DOT:
result[-1][1] += couple[1]
elif couple[0] == token.DOT and last == token.NAME:
result[-1][1] += couple[1]
else:
result.append(couple)
last = couple[0]
return result
def _clean(ast_tuple):
""" transform the ast into as list of tokens (i.e. final elements)
"""
if type(ast_tuple[1]) is TupleType:
v = []
for c in ast_tuple[1:]:
v += _clean(c)
return v
else:
return [list(ast_tuple[:2])]
def cvrtr(tuple):
"""debug method returning an ast string in a readable fashion"""
if type(tuple) is TupleType:
try:
try:
txt = 'token.'+token.tok_name[tuple[0]]
except:
txt = 'symbol.'+symbol.sym_name[tuple[0]]
except:
txt = 'Unknown token/symbol'
return [txt] + map(cvrtr, tuple[1:])
else:
return tuple
__all__ = ('debuild', 'clean', 'cvrtr')
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