/// <summary>
/// Applies a patch, given in TML format, to this Token tree.
/// </summary>
/// <param name="source">A TML representation of the patch to apply.</param>
/// <remarks>Patch syntax is somewhat based on JSON PATCH, RFC 6902.</remarks>
public void Patch(string source)
{
var patch = new Token();
patch.Tokenize(source);
foreach (var token in patch.Tokens)
{
var path = token.Text;
if (token.Name == "add")
{
if (path == "-")
{
Tokens.AddRange(token.Tokens);
}
else if (path.EndsWith("/-"))
{
var target = Path(path.Substring(0, path.Length - 2));
if (target != null)
{
target.Tokens.AddRange(token.Tokens);
}
}
{
var target = Path(path);
if (target != null)
{
Tokens.InsertRange(Tokens.IndexOf(target) + 1, token.Tokens);
}
}
}
else if (token.Name == "remove")
{
var target = Path(path);
if (target != null)
{
if (path.LastIndexOf('/') == -1)
{
Tokens.Remove(target);
}
else
{
var oneUp = Path(path.Substring(0, path.LastIndexOf('/')));
oneUp.Tokens.Remove(target);
}
}
}
else if (token.Name == "replace")
{
var target = Path(path);
if (target != null)
{
if (path.LastIndexOf('/') == -1)
{
Tokens[Tokens.IndexOf(target)] = token.Tokens[0];
}
else
{
var oneUp = Path(path.Substring(0, path.LastIndexOf('/')));
oneUp.Tokens[oneUp.Tokens.IndexOf(target)] = token.Tokens[0];
}
}
}
else if (token.Name == "set")
{
var target = Path(path);
if (target != null)
{
var val = token.GetToken("value");
var txt = token.GetToken("text");
if (val != null)
{
target.Value = val.Value;
}
if (txt != null)
{
target.Text = txt.Text;
}
}
}
}
}