runtime/Lib/site-packages/antlr4/atn/ATNDeserializationOptions.py

# Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
# Use of this file is governed by the BSD 3-clause license that
# can be found in the LICENSE.txt file in the project root.

# need a forward declaration
ATNDeserializationOptions = None

class ATNDeserializationOptions(object):

    defaultOptions = None

    def __init__(self, copyFrom:ATNDeserializationOptions = None):
        self.readOnly = False
        self.verifyATN = True if copyFrom is None else copyFrom.verifyATN
        self.generateRuleBypassTransitions = False if copyFrom is None else copyFrom.generateRuleBypassTransitions

    def __setattr__(self, key, value):
        if key!="readOnly" and self.readOnly:
            raise Exception("The object is read only.")
        super(type(self), self).__setattr__(key,value)

ATNDeserializationOptions.defaultOptions = ATNDeserializationOptions()
ATNDeserializationOptions.defaultOptions.readOnly = True