markers.py 文件源码

def do_compare(self, node):
        def sanity_check(lhsnode, rhsnode):
            valid = True
            if isinstance(lhsnode, ast.Str) and isinstance(rhsnode, ast.Str):
                valid = False
            #elif (isinstance(lhsnode, ast.Attribute)
            #      and isinstance(rhsnode, ast.Attribute)):
            #    klhs = self.get_attr_key(lhsnode)
            #    krhs = self.get_attr_key(rhsnode)
            #    valid = klhs != krhs
            if not valid:
                s = self.get_fragment(node.col_offset)
                raise SyntaxError('Invalid comparison: %s' % s)

        lhsnode = node.left
        lhs = self.evaluate(lhsnode)
        result = True
        for op, rhsnode in zip(node.ops, node.comparators):
            sanity_check(lhsnode, rhsnode)
            op = op.__class__.__name__.lower()
            if op not in self.operators:
                raise SyntaxError('unsupported operation: %r' % op)
            rhs = self.evaluate(rhsnode)
            result = self.operators[op](lhs, rhs)
            if not result:
                break
            lhs = rhs
            lhsnode = rhsnode
        return result