public bool Match(IList<Token> tokens, HandlerRegistry registry)
{
var tokenIndex = 0;
foreach (var pattern in _patterns)
{
var isOptional = pattern.IsOptional;
var isRequired = !isOptional;
var thereAreNoMoreTokens = tokenIndex == tokens.Count;
if (pattern is TagPattern)
{
var match = tokenIndex < tokens.Count &&
tokens[tokenIndex].IsTaggedAs((pattern as TagPattern).TagType);
if (match == false && isRequired)
{
return false;
}
if (match)
{
tokenIndex++;
}
}
else if (pattern is RepeatPattern)
{
var repetition = pattern as RepeatPattern;
int advancement;
var match = repetition.Match(tokens.Skip(tokenIndex).ToList(), out advancement);
if (match == false && isRequired)
{
return false;
}
if (match)
{
tokenIndex += advancement;
}
}
else if (pattern is HandlerTypePattern)
{
if (isOptional && thereAreNoMoreTokens)
{
return true;
}
var subHandlers = registry.GetHandlers((pattern as HandlerTypePattern).Type);
foreach (var handler in subHandlers)
{
if (handler.Match(tokens.Skip(tokenIndex).ToList(), registry))
{
return true;
}
}
}
}
if (tokenIndex != tokens.Count)
{
return false;
}
return true;
}
public void MergeWith(HandlerRegistry registry)
{
foreach (var type in registry._handlers.Keys)
{
if (_handlers.ContainsKey(type) == false)
{
_handlers[type] = new List<ComplexHandler>();
}
_handlers[type].AddRange(registry._handlers[type]);
}
}