public bool TryParse(string sourceText, out MarkupExtension graph)
{
graph = null;
try
{
ParseTree tree = this.parser.Parse(sourceText);
#if DEBUG
// Save result tree for debugging purposes.
this.LastParseTree = tree;
this.LastException = null;
#endif
if (tree.Status == ParseTreeStatus.Parsed)
{
graph = MarkupExtension.Create(tree.Root);
return(true);
}
}
#if DEBUG
catch (Exception ex)
{
this.LastParseTree = null;
this.LastException = ex;
}
#else
catch
{
// ignored
}
#endif
return(false);
}
private static IEnumerable <Argument> GetArguments(IEnumerable <ParseTreeNode> nodes)
{
foreach (var node in nodes)
{
var argument = PositionalArgument.Create(node) ?? (Argument)NamedArgument.Create(node);
if (argument != null)
{
yield return(argument);
}
else
{
// Unwrap argument.
foreach (var markupExtensionArgument in MarkupExtension.GetArguments(node.ChildNodes))
{
yield return(markupExtensionArgument);
}
}
}
}
public static Value Create(ParseTreeNode node)
{
return(LiteralValue.Create(node) ?? (Value)MarkupExtension.Create(node));
}