[webkit-dev] AncestorChainWalker substance and style thoughts

Darin Adler darin at apple.com
Mon Feb 18 18:21:54 PST 2013

On Feb 18, 2013, at 6:18 PM, Hajime Morrita <morrita at chromium.org> wrote:

> Non-trivial tree traversal API in general should, IMO, be modeled after recently introduced NodeTraversal. Having separate namespaces allows us to keep Node API minimal. Also it is stateless and simple. I made NodeRenderingTraversal in that way. AncestorChainWalker could be just merged to NodeRenderingTraversal.

That sounds like a promising direction.

> Speaking of ComposedShadowTreeWalker, I think it is worth having a class instead of namespace
> since it holds configuration parameters to decide, for example, whether it skips specific types of node.

I think this depends on how often this is used, and how.

The designers of the DOM took an approach like this with NodeIterator and it has not proved a popular API design with clients.

-- Darin

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