public static object CreateJsFromXElement <TElement, TAttribute, TObject>(IElementProvider <TElement, TAttribute, TObject> elementProvider, TElement xelement)
{
var index = new Dictionary <string, object>();
index["name"] = elementProvider.LocalName(xelement);
if (elementProvider.Namespace(xelement) != null)
{
index["ns"] = elementProvider.Namespace(xelement);
}
var attrs = elementProvider.Attributes(xelement).Select(attr => new { name = elementProvider.LocalName(attr), value = elementProvider.Value(attr) }).ToArray();
if (attrs.Any())
{
index["a"] = attrs;
}
var elements = elementProvider.Elements(xelement).Select(child => CreateJsFromXElement(elementProvider, child)).Where(child => child != null).ToArray();
if (elements.Any())
{
index["e"] = elements;
}
var texts = elementProvider.Texts(xelement).ToArray();
if (texts.Any())
{
index["t"] = new { value = texts.JoinToString(null) }
}
;
var raws = elementProvider.Raws(xelement).ToArray();
if (raws.Any())
{
index["h"] = raws.JoinToString(null);
}
return(index);
}
}
public static IEnumerable <object> JsSync <TElement, TAttribute, TObject>(IElementProvider <TElement, TAttribute, TObject> elementProvider, TElement oldBody, TElement body, params object[] path)
{
if (oldBody == null)
{
oldBody = elementProvider.Element("body");
yield return(new { path, cmd = "clear-all" });
}
var oldElements = elementProvider.Elements(oldBody).ToArray();
var newElements = elementProvider.Elements(body).ToArray();
var lastText = elementProvider.Texts(oldBody).JoinToString(null);
var newText = elementProvider.Texts(body).JoinToString(null);
var lastHtml = elementProvider.Raws(oldBody).JoinToString(null);
var newHtml = elementProvider.Raws(body).JoinToString(null);
if (oldElements.Length > 0 != newElements.Length > 0 && (lastText != "") != (newText != "") || lastHtml != "" && newHtml == "")
{
yield return(new { path, cmd = "clear" });
oldElements = Array <TElement> .Empty;
lastText = "";
lastHtml = "";
}
var left_i = 0;
for (var i = 0; i < Math.Max(oldElements.Length, newElements.Length); ++i)
{
var oldChild = oldElements.ElementAtOrDefault(i);
var newChild = newElements.ElementAtOrDefault(i);
if (newChild == null)
{
yield return new { path = path.Concat(new[] { new { kind = "element", index = left_i } }).ToArray(), cmd = "remove" }
}
;
else if (oldChild == null || elementProvider.LocalName(oldChild) != elementProvider.LocalName(newChild) || elementProvider.Attribute_Get(oldChild, "data-id") != elementProvider.Attribute_Get(newChild, "data-id"))
{
if (oldChild != null)
{
yield return new { path = path.Concat(new[] { new { kind = "element", index = left_i } }).ToArray(), cmd = "remove" }
}
;
if (i == 0)
{
yield return new { path, cmd = "insert", value = CreateJsFromXElement(elementProvider, newChild) }
}
;
else
{
yield return
new
{
path = path.Concat(new[] { new { kind = "element", index = i - 1 } }).ToArray(),
cmd = "after",
value = CreateJsFromXElement(elementProvider, newChild)
}
};
left_i++;
}
else
{
foreach (var res in JsSync(elementProvider, oldChild, newChild, path.Concat(new[] { new { kind = "element", index = i } }).ToArray()))
{
yield return(res);
}
left_i++;
}
}
var attributes = elementProvider.Attributes(body).ToArray();
var attrs = elementProvider.Attributes(oldBody)
.OuterJoin(attributes, lastAtr => elementProvider.LocalName(lastAtr), newAtr => elementProvider.LocalName(newAtr), (lastAttr, newAttr) => new { lastAttr, newAttr })
.Where(pair => elementProvider.Value(pair.lastAttr) != elementProvider.Value(pair.newAttr))
.Select(pair =>
{
var attrName = pair.lastAttr._f(_ => elementProvider.LocalName(_)) ?? pair.newAttr._f(_ => elementProvider.LocalName(_));
return(new { name = attrName, value = elementProvider.Value(pair.newAttr) });
}
)
.ToArray();
var t = newText != lastText ? new { value = newText } : null;
var h = newHtml != lastHtml ? newHtml : null;
if (attrs.Any() || t != null || h != null)
{
yield return(new { path, cmd = "set", value = new { a = attrs, t, h } });
}
if (true)
{
var jsUpdate = attributes.FirstOrDefault(_attr => elementProvider.LocalName(_attr) == "js-update");
if (jsUpdate != null)
{
yield return new { path, cmd = "js-update", value = elementProvider.Value(jsUpdate) }
}
;
}
}
