loxi_front_end/flags.py

# Copyright 2013, Big Switch Networks, Inc.
#
# LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with
# the following special exception:
#
# LOXI Exception
#
# As a special exception to the terms of the EPL, you may distribute libraries
# generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided
# that copyright and licensing notices generated by LoxiGen are not altered or removed
# from the LoxiGen Libraries and the notice provided below is (i) included in
# the LoxiGen Libraries, if distributed in source code form and (ii) included in any
# documentation for the LoxiGen Libraries, if distributed in binary form.
#
# Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler."
#
# You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain
# a copy of the EPL at:
#
# http://www.eclipse.org/legal/epl-v10.html
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# EPL for the specific language governing permissions and limitations
# under the EPL.

"""
This file needs significant work and normalization.  We need a better
representation for flags, associating them to variables, and associating
them to OF versions.

@fixme Most of this will be going away soon
"""

import sys
import copy
import type_maps
import of_g
import re

# These mark idents as _not_ flags and have precedence
non_flag_rules = [
    "OF_CONFIG_FRAG_NORMAL",
    "OF_FLOW_MOD_FAILED_BAD_FLAGS",
    "OF_SWITCH_CONFIG_FAILED_BAD_FLAGS",
    "OF_PORT_STATE_FLAG_STP_LISTEN",
    "OF_TABLE_CONFIG_TABLE_MISS_CONTROLLER",
    ]

# These mark idents as flags
flag_rules = [
    "OF_CONFIG_",
    "OF_TABLE_CONFIG_",
    ]

def ident_is_flag(ident):
    """
    Return True if ident should be treated as a flag
    """

    # Do negative matches first
    for entry in non_flag_rules:
        if re.match(entry, ident):
            return False

    # General rule, if it says flag it is (unless indicated above)
    if ident.find("FLAG") >= 0:
        return True

    for entry in flag_rules:
        if re.match(entry, ident):
            return True

    return False