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# 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.
"""Monkey patch compiler.transformer to fix line numbering bugs
:author: Sylvain Thenault
:copyright: 2003-2010 LOGILAB S.A. (Paris, FRANCE)
:contact: http://www.logilab.fr/ -- mailto:python-projects@logilab.org
:copyright: 2003-2010 Sylvain Thenault
:contact: mailto:thenault@gmail.com
"""
# TODO : move this module to _nodes_compiler
from types import TupleType
from token import DEDENT
from compiler import transformer
import compiler.ast as nodes
def fromto_lineno(asttuple):
"""return the minimum and maximum line number of the given ast tuple"""
return from_lineno(asttuple), to_lineno(asttuple)
def from_lineno(asttuple):
"""return the minimum line number of the given ast tuple"""
while type(asttuple[1]) is TupleType:
asttuple = asttuple[1]
return asttuple[2]
def to_lineno(asttuple):
"""return the maximum line number of the given ast tuple"""
while type(asttuple[1]) is TupleType:
for i in xrange(len(asttuple) - 1, 0, -1):
if asttuple[i][0] != DEDENT:
asttuple = asttuple[i]
break
else:
raise Exception()
return asttuple[2]
def fix_lineno(node, fromast, toast=None, blockast=None):
if getattr(node, 'fromlineno', None) is not None:
return node
if isinstance(node, nodes.Stmt):
return node
if toast is None or toast is fromast:
node.fromlineno, node.tolineno = fromto_lineno(fromast)
else:
node.fromlineno, node.tolineno = from_lineno(fromast), to_lineno(toast)
if blockast:
node.blockstart_tolineno = to_lineno(blockast)
return node
BaseTransformer = transformer.Transformer
COORD_MAP = {
# if: test ':' suite ('elif' test ':' suite)* ['else' ':' suite]
'if': 0,
# 'while' test ':' suite ['else' ':' suite]
'while': 1,
# 'for' exprlist 'in' exprlist ':' suite ['else' ':' suite]
'for': 3,
# 'try' ':' suite (except_clause ':' suite)+ ['else' ':' suite]
'try': 0,
# | 'try' ':' suite 'finally' ':' suite
# XXX with
}
def fixlineno_wrap(function, stype):
def fixlineno_wrapper(self, nodelist):
node = function(self, nodelist)
try:
blockstart_idx = COORD_MAP[stype]
except KeyError:
return fix_lineno(node, nodelist[0], nodelist[-1])
else:
return fix_lineno(node, nodelist[0], nodelist[-1], nodelist[blockstart_idx])
return fixlineno_wrapper
class ASTNGTransformer(BaseTransformer):
"""overrides transformer for a better source line number handling"""
def com_NEWLINE(self, *args):
# A ';' at the end of a line can make a NEWLINE token appear
# here, Render it harmless. (genc discards ('discard',
# ('const', xxxx)) Nodes)
lineno = args[0][1]
# don't put fromlineno/tolineno on Const None to mark it as dynamically
# added, without "physical" reference in the source
n = nodes.Discard(nodes.Const(None))
n.fromlineno = n.tolineno = lineno
return n
def com_node(self, node):
res = self._dispatch[node[0]](node[1:])
return fix_lineno(res, node)
def com_assign(self, node, assigning):
res = BaseTransformer.com_assign(self, node, assigning)
return fix_lineno(res, node)
def com_apply_trailer(self, primaryNode, nodelist):
node = BaseTransformer.com_apply_trailer(self, primaryNode, nodelist)
return fix_lineno(node, nodelist)
def funcdef(self, nodelist):
node = BaseTransformer.funcdef(self, nodelist)
if node.decorators is not None:
fix_lineno(node.decorators, nodelist[0])
return fix_lineno(node, nodelist[-5], nodelist[-1], nodelist[-3])
def lambdef(self, nodelist):
node = BaseTransformer.lambdef(self, nodelist)
return fix_lineno(node, nodelist[1], nodelist[-1])
def classdef(self, nodelist):
node = BaseTransformer.classdef(self, nodelist)
return fix_lineno(node, nodelist[0], nodelist[-1], nodelist[-2])
def file_input(self, nodelist):
node = BaseTransformer.file_input(self, nodelist)
if node.node.nodes:
node.tolineno = node.node.nodes[-1].tolineno
else:
node.tolineno = 0
return node
# wrap *_stmt methods
for name in dir(BaseTransformer):
if name.endswith('_stmt') and not (name in ('com_stmt',
'com_append_stmt')
or name in ASTNGTransformer.__dict__):
setattr(BaseTransformer, name,
fixlineno_wrap(getattr(BaseTransformer, name), name[:-5]))
transformer.Transformer = ASTNGTransformer
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