// Validates that the elements named in 'args' in WebKit can be converted
// from HTML back into ECMA XML.
//
// Returns null on success, otherwise a string with the error details
//
public string ValidateElements(IWebView web, params string [] args)
{
foreach (var arg in args)
{
try {
var str = web.Fetch(arg);
DocConverter.ToXml(str, canonical: true);
web.RunJS("postOk", arg);
} catch (UnsupportedElementException e) {
web.RunJS("postError", arg);
return("Parsing error: " + e.Message);
} catch (StackOverflowException e) {
return("Exception " + e.GetType().ToString());
}
}
return(null);
}
//
// Updates the target XElement with the edited text.
// The first pass uses the provided xpath expression to remove all the nodes that match
// this expression from the target (this cleans the nodes that we are about to replace)
// then the named htmlElement is used to lookup the contents on WebKit and the results
// are converted back to XML which is stashed in the target specified by xpath.
//
// Returns true on success
public bool UpdateNode(IWebView webView, XElement target, string xpath, string htmlElement, out string error)
{
error = null;
var node = target.XPathSelectElement(xpath);
node.RemoveNodes();
try {
var str = webView.Fetch(htmlElement);
foreach (var ret in DocConverter.ToXml(str, canonical: true))
{
node.Add(ret);
}
} catch (UnsupportedElementException e) {
error = e.Message;
return(false);
}
return(true);
}