def visit(self, node, *args):
"Recursively validate node and all of its children."
fn = getattr(self, 'visit' + Helpers.classname(node))
if Helpers.DEBUG(): self.trace(node)
fn(node, *args)
for child in node.getChildNodes():
self.visit(child, *args)
def trace(self, node):
"Debugging utility for tracing the validation of AST nodes."
print Helpers.classname(node)
for attr in dir(node):
if attr[:2] != '__':
print ' ' * 4, "%-15.15s" % attr, getattr(node, attr)
def fail(self, node, *args):
"Default callback for unallowed AST nodes."
lineno = Helpers.get_node_lineno(node)
self.errors.append(SafeEvalASTNodeError( \
"execution of '%s' statements is denied" % Helpers.classname(node),
lineno))