def visit_Nonlocal(self, nonl):
for name in nonl.names:
old_role = self.scope.lookup_role(name)
msg = ""
if old_role & SYM_GLOBAL:
msg = "name '%s' is nonlocal and global" % (name, )
if old_role & SYM_PARAM:
msg = "name '%s' is parameter and nonlocal" % (name, )
if isinstance(self.scope, ModuleScope):
msg = "nonlocal declaration not allowed at module level"
if msg is not "":
raise SyntaxError(msg, nonl.lineno, nonl.col_offset)
if (old_role & (SYM_USED | SYM_ASSIGNED)
and not (name == '__class__'
and self.scope._hide_bound_from_nested_scopes)):
if old_role & SYM_ASSIGNED:
msg = "name '%s' is assigned to before nonlocal declaration" \
% (name,)
else:
msg = "name '%s' is used prior to nonlocal declaration" % \
(name,)
misc.syntax_warning(self.space, msg,
self.compile_info.filename, nonl.lineno,
nonl.col_offset)
self.note_symbol(name, SYM_NONLOCAL)
def visit_Global(self, glob):
for name in glob.names:
old_role = self.scope.lookup_role(name)
if (self.scope._hide_bound_from_nested_scopes
and name == '__class__'):
msg = ("'global __class__' inside a class statement is not "
"implemented in PyPy")
raise SyntaxError(msg,
glob.lineno,
glob.col_offset,
filename=self.compile_info.filename)
if old_role & SYM_PARAM:
msg = "name '%s' is parameter and global" % (name, )
raise SyntaxError(msg, glob.lineno, glob.col_offset)
if old_role & SYM_NONLOCAL:
msg = "name '%s' is nonlocal and global" % (name, )
raise SyntaxError(msg, glob.lineno, glob.col_offset)
if old_role & (SYM_USED | SYM_ASSIGNED):
if old_role & SYM_ASSIGNED:
msg = "name '%s' is assigned to before global declaration"\
% (name,)
else:
msg = "name '%s' is used prior to global declaration" % \
(name,)
misc.syntax_warning(self.space, msg,
self.compile_info.filename, glob.lineno,
glob.col_offset)
self.note_symbol(name, SYM_GLOBAL)
def visit_ImportFrom(self, imp):
for alias in imp.names:
if self._visit_alias(alias):
if self.scope.note_import_star(imp):
msg = "import * only allowed at module level"
misc.syntax_warning(
self.space, msg, self.compile_info.filename,
imp.lineno, imp.col_offset)
def visit_Global(self, glob):
for name in glob.names:
old_role = self.scope.lookup_role(name)
if old_role & (SYM_USED | SYM_ASSIGNED):
if old_role & SYM_ASSIGNED:
msg = "name '%s' is assigned to before global declaration" % (name,)
else:
msg = "name '%s' is used prior to global declaration" % (name,)
misc.syntax_warning(self.space, msg, self.compile_info.filename, glob.lineno, glob.col_offset)
self.note_symbol(name, SYM_GLOBAL)
def visit_Global(self, glob):
for name in glob.names:
old_role = self.scope.lookup_role(name)
if old_role & (SYM_USED | SYM_ASSIGNED):
if old_role & SYM_ASSIGNED:
msg = "name '%s' is assigned to before global declaration" \
% (name,)
else:
msg = "name '%s' is used prior to global declaration" % \
(name,)
misc.syntax_warning(self.space, msg, self.compile_info.filename,
glob.lineno, glob.col_offset)
self.note_symbol(name, SYM_GLOBAL)
def visit_Nonlocal(self, nonl):
for name in nonl.names:
old_role = self.scope.lookup_role(name)
if old_role & (SYM_USED | SYM_ASSIGNED):
if old_role & SYM_ASSIGNED:
msg = "name '%s' is assigned to before nonlocal declaration" \
% (name,)
else:
msg = "name '%s' is used prior to nonlocal declaration" % \
(name,)
misc.syntax_warning(self.space, msg, self.compile_info.filename,
nonl.lineno, nonl.col_offset)
self.note_symbol(name, SYM_NONLOCAL)
def visit_Nonlocal(self, nonl):
for name in nonl.names:
old_role = self.scope.lookup_role(name)
if old_role & (SYM_USED | SYM_ASSIGNED):
if old_role & SYM_ASSIGNED:
msg = "name '%s' is assigned to before nonlocal declaration" \
% (name,)
else:
msg = "name '%s' is used prior to nonlocal declaration" % \
(name,)
misc.syntax_warning(self.space, msg,
self.compile_info.filename, nonl.lineno,
nonl.col_offset)
self.note_symbol(name, SYM_NONLOCAL)
def _visit_comprehension(self, node, comps, *consider):
outer = comps[0]
assert isinstance(outer, ast.comprehension)
outer.iter.walkabout(self)
new_scope = FunctionScope("<genexpr>", node.lineno, node.col_offset)
self.push_scope(new_scope, node)
self.implicit_arg(0)
outer.target.walkabout(self)
self.visit_sequence(outer.ifs)
self.visit_sequence(comps[1:])
for item in list(consider):
item.walkabout(self)
self.pop_scope()
# http://bugs.python.org/issue10544: was never fixed in CPython,
# but we can at least issue a SyntaxWarning in the meantime
if new_scope.is_generator:
msg = ("'yield' inside a list or generator comprehension behaves "
"unexpectedly (http://bugs.python.org/issue10544)")
misc.syntax_warning(self.space, msg, self.compile_info.filename,
node.lineno, node.col_offset)
