I'm experimenting with Webkit GTK DOM TreeWalker API. Creating a
TreeWalker with WebKit GTK seems pretty straightforward - except for one
big problem: the fourth argument in the
webkit_dom_document_create_tree_walker expects a filter object - that
is, it wants an instance of WebKitDOMNodeFilter. Well, the
document.createTreeWalker Javascript function also takes a filter, but
you can pass null if you don't want to use a filter. With the Webkit
API, passing NULL doesn't work. If you call:
WebKitDOMTreeWalker* walker =
webkit_dom_document_create_tree_walker(doc, root, SHOW_ALL, NULL, false,
err)
You get an assertion failure:
** (webkit:3367): CRITICAL : WebKitDOMTreeWalker*
webkit_dom_document_create_tree_walker(WebKitDOMDocument*,
WebKitDOMNode*, gulong, WebKitDOMNodeFilter*, gboolean, GError):
assertion `filter' failed
So, the WebKit GTK API won't accept a NULL pointer for the filter
argument. You need to pass an instance of a WebKitDOMNodeFilter. Okay,
again - this wouldn't be a problem either, except I've searched far and
wide through the WebKit GTK API, and I can't find anyway to create a
WebKitDOMNodeFilter object. The header file for WebKitDOMNodeFilter.h
doesn't expose any constructor for WebKitDOMNodeFilter. It seems like
the API doesn't ever expose anyway to actually construct a
WebKitDOMNodeFilter object at all.
Yet... the API exposes many functions (like
webkit_dom_document_create_tree_walker, and
webkit_dom_document_create_node_iterator) which require a
WebKitDOMNodeFilter. So... is the API just incomplete right now? Or, is
there some way to create a Filter object which I'm just not seeing?
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