protected static void AssertChildCount([NotNull] ParseTreeNode parseNode, int expectedChildCount)
{
var actualChildCount = parseNode.EnsureNotNull().ChildNodes.Count;
if (actualChildCount != expectedChildCount)
{
throw new InvalidOperationException(
$@"The expected child node count is {expectedChildCount} while actual is {actualChildCount}.");
}
}
protected static TNode[] GetChildren <TNode>([NotNull] ParseTreeNode parseNode)
where TNode : AstNodeBase
{
var result = parseNode
.EnsureNotNull()
.ChildNodes
.Select(obj => obj.EnsureNotNull().AstNode.EnsureNotNull())
.Cast <TNode>()
.ToArray();
return(result);
}
protected static TNode GetChildNode <TNode>([NotNull] ParseTreeNode parseNode, int index)
where TNode : AstNodeBase
{
if (!(parseNode.EnsureNotNull().ChildNodes[index].AstNode is TNode result))
{
throw new InvalidOperationException(
$@"The child node at index {index} is expected to be of type '{
typeof(TNode).GetQualifiedName()}'.");
}
return(result);
}
protected static string GetTokenText([NotNull] ParseTreeNode parseNode)
{
return(parseNode.EnsureNotNull().Token.EnsureNotNull().Text.EnsureNotNull());
}
