-import compiler
-
-class Unsafe_Source_Error(Exception):
- def __init__(self,error,descr = None,node = None):
- self.error = error
- self.descr = descr
- self.node = node
- self.lineno = getattr(node,"lineno",None)
-
- def __repr__(self):
- return "Line %d. %s: %s" % (self.lineno, self.error, self.descr)
- __str__ = __repr__
-
-class SafeEval(object):
-
- def visit(self, node,**kw):
- cls = node.__class__
- meth = getattr(self,'visit'+cls.__name__,self.default)
- return meth(node, **kw)
-
- def default(self, node, **kw):
- for child in node.getChildNodes():
- return self.visit(child, **kw)
-
- visitExpression = default
-
- def visitConst(self, node, **kw):
- return node.value
-
- def visitDict(self,node,**kw):
- return dict([(self.visit(k),self.visit(v)) for k,v in node.items])
-
- def visitTuple(self,node, **kw):
- return tuple(self.visit(i) for i in node.nodes)
-
- def visitList(self,node, **kw):
- return [self.visit(i) for i in node.nodes]
-
-class SafeEvalWithErrors(SafeEval):
-
- def default(self, node, **kw):
- raise Unsafe_Source_Error("Unsupported source construct",
- node.__class__,node)
-
- def visitName(self,node, **kw):
- if node.name == 'None': return None
- raise Unsafe_Source_Error("Strings must be quoted",
- node.name, node)
-
- # Add more specific errors if desired
-
-def safe_eval(source, fail_on_error = True):
- if source.strip() == '': return None
- walker = fail_on_error and SafeEvalWithErrors() or SafeEval()
- try:
- ast = compiler.parse(source,"eval")
- except SyntaxError, err:
- raise
- try:
- return walker.visit(ast)
- except Unsafe_Source_Error, err:
- raise
+#import compiler
+#
+#class Unsafe_Source_Error(Exception):
+# def __init__(self,error,descr = None,node = None):
+# self.error = error
+# self.descr = descr
+# self.node = node
+# self.lineno = getattr(node,"lineno",None)
+#
+# def __repr__(self):
+# return "Line %d. %s: %s" % (self.lineno, self.error, self.descr)
+# __str__ = __repr__
+#
+#class SafeEval(object):
+#
+# def visit(self, node,**kw):
+# cls = node.__class__
+# meth = getattr(self,'visit'+cls.__name__,self.default)
+# return meth(node, **kw)
+#
+# def default(self, node, **kw):
+# for child in node.getChildNodes():
+# return self.visit(child, **kw)
+#
+# visitExpression = default
+#
+# def visitConst(self, node, **kw):
+# return node.value
+#
+# def visitDict(self,node,**kw):
+# return dict([(self.visit(k),self.visit(v)) for k,v in node.items])
+#
+# def visitTuple(self,node, **kw):
+# return tuple(self.visit(i) for i in node.nodes)
+#
+# def visitList(self,node, **kw):
+# return [self.visit(i) for i in node.nodes]
+#
+#class SafeEvalWithErrors(SafeEval):
+#
+# def default(self, node, **kw):
+# raise Unsafe_Source_Error("Unsupported source construct",
+# node.__class__,node)
+#
+# def visitName(self,node, **kw):
+# if node.name == 'None': return None
+# raise Unsafe_Source_Error("Strings must be quoted",
+# node.name, node)
+#
+# # Add more specific errors if desired
+#
+#def safe_eval(source, fail_on_error = True):
+# if source.strip() == '': return None
+# walker = fail_on_error and SafeEvalWithErrors() or SafeEval()
+# try:
+# ast = compiler.parse(source,"eval")
+# except SyntaxError, err:
+# raise
+# try:
+# return walker.visit(ast)
+# except Unsafe_Source_Error, err:
+# raise