bool IsAlternativeNeeded(ExplicitRule curr, ExtensibleRule parent)
{
if (curr == null)
{
return(false);
}
var seq = curr.Expression as RuleExpression.Sequence;
if (seq == null)
{
return(false);
}
if (seq.Childs.Count != 3)
{
return(false);
}
var arg1 = seq.Childs[0] as RuleExpression.RuleUsage;
var arg2 = seq.Childs[2] as RuleExpression.RuleUsage;
if (arg1 == null || arg2 == null || arg1.RuleName != parent.Name || arg2.RuleName != parent.Name)
{
return(false);
}
return(true);
}
public void AddInfo(ExtensibleRule rule)
{
foreach (var item in rule.GetAlternatives())
{
if (IsAlternativeNeeded(item.Rule as ExplicitRule, rule))
{
_alternatives.Add(new RuleAlternativeInfo(item, rule, this));
}
}
_alternatives.Sort((a, b) => a.AlternativeInfo.Priority.CompareTo(b.AlternativeInfo.Priority));
}
public void VisitExtensibleRule(ExtensibleRule extensibleRule)
{
var rewrite = extensibleRule.GetAttributes().Any(a => a.Name == "RewriteRecursion");
if (rewrite)
{
RuleAlternativesInfo info;
if (!_info.TryGetValue(extensibleRule.Name, out info))
{
_info.Add(extensibleRule.Name, info = new RuleAlternativesInfo());
}
info.AddInfo(extensibleRule);
}
}
