internal static ISemanticNode And(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
branch = branch.Unwrap();
ISemanticNode left = recurse(branch.GetDescendant(0));
ISemanticNode right = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)EbnfNodeType.And, left, right));
}
internal static ISemanticNode Regex(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
branch = branch.Unwrap();
var text = branch.Leaf.MatchedText;
text = text
.Substring(1, text.Length - 2)
.Replace(@"\\", @"\")
.Replace(@"\/", @"/");
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)EbnfNodeType.Regex, startIndex, text));
}
static ISemanticNode DefaultAction(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
if (branch.Rule is NamedRule rule)
{
throw new Exception($"No action specified for named rule: {rule.Name}");
}
branch = branch.Unwrap();
if (branch.Rule is NamedRule)
{
return(recurse(branch));
}
var children = branch.Elements
.Select(n =>
{
if (n.Rule is NamedRule)
{
return(recurse(n));
}
else
{
return(DefaultAction(n, recurse));
}
})
.Where(c => c != null)
.ToList();
if (children.Count == 1)
{
return(children[0]);
}
else
{
return(new BranchSemanticNode(0, branch.StartIndex, children));
}
}