c_gen/flags.py

# Copyright 2013, Big Switch Networks, Inc.
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"""
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 c_gen.of_g_legacy as 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