private static LinkAttribute ParseAttribute(Scanner scanner)
{
String name = scanner.Find(WordRegex);
if (name == null)
return null;
else
{
Object value = null;
// check for name-value-pair
if (scanner.Find(new Regex("="), 1) == null)
// flag attribute
value = true;
else
{
String s = null;
if ((s = scanner.Find(QuotedString)) != null)
// trim " "
value = s.Substring(1, s.Length - 2);
else if ((s = scanner.Find(Cardinal)) != null)
value = Int32.Parse(s);
// TODO what if both pattern failed?
}
return new LinkAttribute(name, value);
}
}
public static IEnumerable<WebLink> Parse(String linkFormat)
{
if (!String.IsNullOrEmpty(linkFormat))
{
Scanner scanner = new Scanner(linkFormat);
String path = null;
while ((path = scanner.Find(ResourceNameRegex)) != null)
{
path = path.Substring(1, path.Length - 2);
WebLink link = new WebLink(path);
String attr = null;
while (scanner.Find(DelimiterRegex, 1) == null &&
(attr = scanner.Find(WordRegex)) != null)
{
if (scanner.Find(EqualRegex, 1) == null)
{
// flag attribute without value
link.Attributes.Add(attr);
}
else
{
String value = null;
if ((value = scanner.Find(QuotedString)) != null)
{
// trim " "
value = value.Substring(1, value.Length - 2);
if (Title.Equals(attr))
link.Attributes.Add(attr, value);
else
foreach (String part in BlankRegex.Split(value))
link.Attributes.Add(attr, part);
}
else if ((value = scanner.Find(WordRegex)) != null)
{
link.Attributes.Set(attr, value);
}
else if ((value = scanner.Find(Cardinal)) != null)
{
link.Attributes.Set(attr, value);
}
}
}
yield return link;
}
}
yield break;
}
public static RemoteResource Deserialize(String linkFormat)
{
RemoteResource root = new RemoteResource(String.Empty);
Scanner scanner = new Scanner(linkFormat);
String path = null;
while ((path = scanner.Find(ResourceNameRegex)) != null)
{
path = path.Substring(1, path.Length - 2);
// Retrieve specified resource, create if necessary
RemoteResource resource = new RemoteResource(path);
LinkAttribute attr = null;
while (scanner.Find(DelimiterRegex, 1) == null && (attr = ParseAttribute(scanner)) != null)
{
AddAttribute(resource.Attributes, attr);
}
root.AddSubResource(resource);
}
return root;
}