scala/scala-xml

The standard Scala XML library. http://scala-lang.org/conduct/ applies

Peter László

@ptrlaszlo

it seems that adding the scope doesn't apply to the child elements

Aaron S. Hawley

@ashawley

Yeah, seems you'll need to traverse the tree and add the scope.

Seth Tisue

@SethTisue

@ashawley what do you make of scala/scala-xml#253 ?

Aaron S. Hawley

@ashawley

Yikes, good catch! All hail the community build!

Nothing obvious, but I'll look in to it.

Aaron S. Hawley

@ashawley

@ptrlaszlo Here's an example of a traversal

object addScope extends scala.xml.transform.RewriteRule {
  override def transform(n: scala.xml.Node): Seq[scala.xml.Node] = n match {
    case elem: scala.xml.Elem =>
      elem.copy(scope = elem.scope.copy(uri = "urn:CollectionResponse", parent = scala.xml.TopScope),
                child = elem.child.map(addScope))
    case n => n
  }
}

val order = <order><ordernumber/></order>

addScope(order)

https://scastie.scala-lang.org/SS7kJbA4QKCKXafWV9NzAA

Peter László

@ptrlaszlo

thanks Aaron!

Marcel Koopman

@marcelkoopman_gitlab

how can i retrieve the xpath of a xml element? I mean the getRelativeXPath or something like that

Aaron S. Hawley

@ashawley

There may have been a Stackoverflow question about that

Here's an answer in Java for all elements

Marcel Koopman

@marcelkoopman_gitlab

i've seen one where the answer was not implemented

Aaron S. Hawley

@ashawley

https://stackoverflow.com/questions/48596490/how-to-get-xpath-of-all-nodes-in-xml-by-using-java-or-scala

Marcel Koopman

@marcelkoopman_gitlab

thx, but i was looking for scala xml solutions

Aaron S. Hawley

@ashawley

Here's a solution using Scala and the Java DOM

https://stackoverflow.com/questions/7334375/is-there-a-way-to-get-a-reverse-xpath-in-scala

Well, scala-xml doesn't come with anything out of the box with this

Aaron S. Hawley

@ashawley

This was similar

https://stackoverflow.com/questions/48767048/scala-convert-xml-to-key-value-map

Marcel Koopman

@marcelkoopman_gitlab

thx

ethicalbeginner

@nitishram

hi all ,how to parse xml in scala using sax parser?

Seth Tisue

@SethTisue

@nitishram where you are you stuck?

ethicalbeginner

@nitishram

for single xml with one root tag i could take it but for multiple root tags cound't read all

Seth Tisue

@SethTisue

@nitishram showing the code you have so far might help

Brian Kent

@bdkent

Is there a particular reason scala.xml.Utility.serialize works on a StringBuilder rather than something more abstract? As it seems like the only operation used is StringBuilder#append, is there any reason it couldn't be reworked to use something like java.lang.Appendable so that a java.io.Writer could be provided (and the entire XML wouldn't have to exist as a huge string in memory )?

Aaron S. Hawley

@ashawley

Well, althoughscala.xml.Utility.serialize is a published function, it seems that its intended for internal use rather than external. Internally, scala-xml implements a lot of the library on StringBuilder.

You're right, it's not ideal that the entire serialized XML is held in memory.

Aaron S. Hawley

@ashawley

Are you actually using this method directly, or did you run in to memory issues when using other methods?

Brian Kent

@bdkent

Memory issues, yes. I have locally made a version of the serialize method using Appendable and it all seems to work.

Aaron S. Hawley

@ashawley

Cool. I wonder if that improvement could be leveraged in XML.write, generally?

Brian Kent

@bdkent

I don’t see why not.

I used a few implicit classes to limit the actual files that had to change.

aappddeevv

@aappddeevv

Does the latest scala-xml (1.2.0) work with dotty? I'm having a hard time discerning whether what the XML story is with the current RC release of dotty. I saw this but am unsure how it relates.

Aaron S. Hawley

@ashawley

@aappddeevv What are you trying to do?

I'm not aware of any dotty artifacts for scala-xml that have been published, yet.

aappddeevv

@aappddeevv

Simple XML parsing, not creation nor literals. I saw that the scala-xml uses CanBuildFrom which I think is gone in dotty so it started me wondering about what scala.xml might be pulling in and if there are hidden gotchas I should be worried about. Its working in dotty using the scala-xml 2.13 version but I was worried.

Seth Tisue

@SethTisue

Dotty can use Scala 2 binaries, so I would expect it to just work without needing a special artifact to be published for Dotty

CanBuildFrom is already gone in Scala 2.13, so CanBuildFrom isn't a Scala 2 vs 3 difference

at present Dotty still uses the Scala 2.12 stdlib, where CanBuildFrom is still present. but they expect to switch to the 2.13 stdlib quite soon

aappddeevv

@aappddeevv

I just saw that. I'm thinking that once dotty switches to the 2.13 stdlib that this is where there may be a problem unless scala-xml is republished under 2.13--if I read your comment right.

That could happen in as little as 30 days if they keep publishing RC releases each month.

Seth Tisue

@SethTisue

@aappddeevv scala-xml is already published for 2.13

aappddeevv

@aappddeevv

Ah..that's right...I'm getting a transitive dependency that pushes it back to a 2.12 version though for this dotty project. I guess I'll wait and see what happens to that lib and the xml dependency once the dotty stdlib is updated..

Seth Tisue

@SethTisue

:+1:

Aaron S. Hawley

@ashawley

Indeed, seems you need to use the sbt-dotty plugin and 2.12 artifacts to work with dependencies from dotty

I've made some changes to the old scala modules sample repo to show that it works

https://github.com/ashawley/scala-module-dependency-sample

Mohamedali10

@Mohamedali10

Hello @all, I'am trying to create a large XML file that contains data retrieved from data base, for that I do not want to hold the whole xml in memory but instead I want to write it directly in the disk, any recommendation on implementing this please?

Seth Tisue

@SethTisue

@Mohamedali10 the scala-xml library probably won't be useful to you here, it's designed for in-memory applications. (there's scala.xml.pull, but it's deprecated, for good reasons.) I'd suggest looking into what Java XML libraries support streaming, and use one of those from Scala

Mohamedali10

@Mohamedali10

@SethTisue thanks

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