static int GetMaxRating(NodeRegexFlag currentReFlags)
{
int maxRating;
if ((currentReFlags & NodeRegexFlag.PreceededByNotSpecific) != 0)
{
maxRating = RateReFlags(NodeRegexFlag.Mandatory | NodeRegexFlag.Duplicated);
}
else
{
maxRating = RateReFlags(NodeRegexFlag.Interesting | NodeRegexFlag.Conditional | NodeRegexFlag.Duplicated);
}
return(maxRating);
}
static int RateReFlags(NodeRegexFlag flags)
{
var indexedFlags = flags & (NodeRegexFlag.InterestMask | NodeRegexFlag.Conditional | NodeRegexFlag.Duplicated);
var ratingsLookupTable = new NodeRegexFlag[] {
NodeRegexFlag.Mandatory,
NodeRegexFlag.Interesting,
NodeRegexFlag.Mandatory | NodeRegexFlag.Conditional,
NodeRegexFlag.Interesting | NodeRegexFlag.Conditional,
NodeRegexFlag.Mandatory | NodeRegexFlag.Duplicated,
NodeRegexFlag.Interesting | NodeRegexFlag.Duplicated,
NodeRegexFlag.Mandatory | NodeRegexFlag.Conditional | NodeRegexFlag.Duplicated,
NodeRegexFlag.Interesting | NodeRegexFlag.Conditional | NodeRegexFlag.Duplicated,
};
return(ratingsLookupTable.Select((f, i) => new { f, i }).Where(x => x.f == indexedFlags).Select(x => x.i)
.DefaultIfEmpty(ratingsLookupTable.Length).First());
}
