/// <summary>
/// Given a tree, set the tags on the leaf nodes if they are not
/// already set.
/// </summary>
/// <remarks>
/// Given a tree, set the tags on the leaf nodes if they are not
/// already set. Do this by using the preterminal's value as a tag.
/// </remarks>
public static void SetLeafTagsIfUnset(Tree tree)
{
if (tree.IsPreTerminal())
{
Tree leaf = tree.Children()[0];
if (!(leaf.Label() is IHasTag))
{
return;
}
IHasTag label = (IHasTag)leaf.Label();
if (label.Tag() == null)
{
label.SetTag(tree.Value());
}
}
else
{
foreach (Tree child in tree.Children())
{
SetLeafTagsIfUnset(child);
}
}
}
// It's okay to not support the fromString operation
private static void ValidateHasTag(string type, IHasTag lab, string tag)
{
NUnit.Framework.Assert.AreEqual(type + " does not have tag it was constructed with", lab.Tag(), tag);
string newVal = "feijoa";
lab.SetTag(newVal);
NUnit.Framework.Assert.AreEqual(type + " does not have tag set with setTag", newVal, lab.Tag());
// restore value
lab.SetTag(tag);
}
