Request for example: Replacing a DOM element

[saurabhnanda]

Can the xml-conduit family of libraries be used to replace an HTML element with another HTML element (say, the output of Lucid) and render the output? I've been struggling to figure something out from the docs, but haven't been able to do so yet.

[saurabhnanda]

Just following up on this.

[k0ral]

Your question is a bit vague, it would be better if you could provide an example of the desired input/output and how you attempted to implement it.
From what I understand, you might want something like this:

-- Both input and output are a stream of XML events
solution :: Conduit Event m Event
solution = parseElements .| replaceElement .| renderElements

-- Implement here what you mean by "HTML element"
data Element

-- Then implement those conduits
parseElements :: Conduit Event m Element
replaceElement :: Conduit Element m Element
renderElements :: Conduit Element m Event

[saurabhnanda]

Actually, the question is probably simpler than it sounds. I haven't been able to figure out how to use the DOM mutation APIs exposed by these libraries. Did I miss a tutorial/doc?

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On 22-Oct-2017 7:23 PM, "k0ral" ***@***.***> wrote: Your question is a bit vague, it would be better if you could provide an example of the desired input/output and how you attempted to implement it. From what I understand, you might want something like this: -- Both input and output are a stream of XML eventssolution :: Conduit Event m Event solution = parseElements .| replaceElement .| renderElements -- Implement here what you mean by "HTML element"data Element -- Then implement those conduitsparseElements :: Conduit Event m ElementreplaceElement :: Conduit Element m ElementrenderElements :: Conduit Element m Event — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#115 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABu0bz8-WxENjXujdSFa8fDOzkhagd6ks5su0jSgaJpZM4Pu0H1> .

[saurabhnanda]

I've been looking at https://hackage.haskell.org/package/xml-conduit-1.7.0/docs/Text-XML-Cursor.html and all the functions seems they're for querying / reading XML elements, not mutating/writing them.

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On 22-Oct-2017 7:32 PM, "Saurabh Nanda" ***@***.***> wrote: Actually, the question is probably simpler than it sounds. I haven't been able to figure out how to use the DOM mutation APIs exposed by these libraries. Did I miss a tutorial/doc? On 22-Oct-2017 7:23 PM, "k0ral" ***@***.***> wrote: > Your question is a bit vague, it would be better if you could provide an > example of the desired input/output and how you attempted to implement it. > From what I understand, you might want something like this: > > -- Both input and output are a stream of XML eventssolution :: Conduit Event m Event > solution = parseElements .| replaceElement .| renderElements > -- Implement here what you mean by "HTML element"data Element > -- Then implement those conduitsparseElements :: Conduit Event m ElementreplaceElement :: Conduit Element m ElementrenderElements :: Conduit Element m Event > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > <#115 (comment)>, or mute > the thread > <https://github.com/notifications/unsubscribe-auth/AABu0bz8-WxENjXujdSFa8fDOzkhagd6ks5su0jSgaJpZM4Pu0H1> > . >

[k0ral]

Indeed, Text.XML.Cursor only makes it possible to browse an XML document without mutating it.
I believe you should explore the following solutions instead:

• if the location of the element(s) to replace is known in advance (statically), then zippers or lenses are probably the right tools;
• otherwise, you're bound to scan the whole XML document, in which case a streaming solution is relevant, and you might want to dig my previous answer.

[kindaro]

Actually, what's stopping an Axis from trying to modify a Cursor in a specified way and returning a singleton if successfully done so? It seems to me that a "replace" axis that swaps the current node of a cursor for a given one is a natural thing to implement.