private static ConsumeReferenceExpression BuildReferenceExpression(CstNonterminalNode node)
{
ConsumeReferenceExpression expression = new ConsumeReferenceExpression();
if (node.Children.Count == 1)
{
// CstNonterminalNode nonterminal = (CstNonterminalNode)((Token)((ICstTerminalNode)node.Children[0]).Terminal).StructuredLexeme;
expression.NonTerminal = node.Children[0].Coalesce();
}
else
{
CstNonterminalNode targetNode = (CstNonterminalNode)node.Children[0];
ConsumeExpression target = BuildExpression(targetNode);
expression.Target = target;
// CstNonterminalNode nonterminal = (CstNonterminalNode)((Token)((ICstTerminalNode)node.Children[2]).Terminal).StructuredLexeme;
expression.NonTerminal = node.Children[2].Coalesce();//nonterminal.Coalesce();
}
return(expression);
}
public override IEnumerable <ICstNode> Resolve(ICstNonterminalNode node)
{
if (Index < 1)
{
throw new InvalidOperationException("Indices in consume attributes are 1-based: " + this);
}
ConsumeReferenceExpression targetAsReference = (ConsumeReferenceExpression)Target;
Func <ICstNonterminalNode, ICstNode> ret = cstNode => cstNode.Children.OfType <CstNonterminalNode>().Where(o => o.Nonterminal.Name == targetAsReference.NonTerminal).ElementAtOrDefault(Index - 1);
IEnumerable <ICstNode> result = new ICstNode[0];
if (targetAsReference.Target != null)
{
foreach (ICstNonterminalNode child in targetAsReference.Target.Resolve(node))
{
if (child != null)
{
ICstNode element = ret(child);
if (element != null)
{
result = result.Union(element);
}
}
}
}
else
{
ICstNode element = ret(node);
if (element != null)
{
result = result.Union(element);
}
}
return(result);
}
