private static void AddParentToChild(string fromTag, string toTag, TagRule rule, Dictionary <string, ImmutableDictionary <string, TagRule> > map)
{
if (!map.TryGetValue(fromTag, out var parents))
{
parents = ImmutableDictionary <string, TagRule> .Empty;
}
if (!parents.ContainsKey(toTag))
{
map[fromTag] = parents.Add(toTag, rule);
}
}
public static RuleResult <TResult> Create <TResult>(TagRule rule, TResult result) => new RuleResult <TResult>(new[] { rule }, result);