looks like it's possible:
oh thanks, I found another SO link with some suggestions along those lines, I think - https://stackoverflow.com/questions/6124239/how-to-update-xml-using-xpath-and-java - but haven't had a chance to go through it in detail yet
Have just found this, looks great so far. Am a bit stuck with doing fall-back resolutions on case classes, I want to be able to do an orElse, something like:
case class Example(a: String, b: String)
NodeDecoder.decode(
xp”//a”,
xp”//b”.orElse(xp”//c”)
)(Example.apply)Is there a neat way to do something like that?
(haven't tried it, it's something I vaguely seem to remember from when I did a lot more xpath than nowadays)
From what I can see
| is a union operator in XPath - selects these nodes OR those nodes
do you know what version of XPath is supported by kantan.xpath?
not entirely sure, whatever is supported by the JVM
Looks like it’s XPath 1.0: https://docs.oracle.com/javase/8/docs/api/javax/xml/xpath/package-summary.html
I guess I could use
.orElse(…) and another query if I wanted
I couldn’t work out why the
Compiler.xpath1 call was needed - in other places it looks as if it acts as an implicit conversion
Xml isn’t a thing that happens much in Scala world
well, feel free to ask questions you might have about the project here, that's what it's made for. I try to keep the documentation comprehensive and up to date, so I encourage you to have a look if you'd like to learn more and see if it fits your needs
(and to have a look at its sister projects, kantan.regex and kantan.csv, for basically the same library, but for regular expressions and csv)
hey I am interested in doing somewhat user-friendly XML diff of two documents programmatically. I found a number of useful references on the Java side and before I use them, I am curious as to whether some or much of it is already available in kantan.xpath. The input XML documents are created with a PrettyPrinter and thus have newlines in reasonable places. So the input to diff is pretty-printed XML docs (an assumption I can make that one would normally not make). I am looking at setting client data of line number with each node in the 2 XML documents I am comparing (I found this: https://eyalsch.wordpress.com/2010/11/30/xml-dom-2/). And finally XMLUnit for Java 2.x seems to have sufficient flexibility for what I am trying to do, namely order of child nodes is not important for comparison (something called DifferenceEvaluators.downgradeDifferencesToEqual(ComparisonType.CHILD_NODELIST_SEQUENCE)))
The general gist of what I am trying to do is something similar to Unix diff but accounting for some of the above requirements, showing what is different on both sides, what exists only one side and the line numbers associated with the nodes that appear in the report.
Hi. I just searched for an xpath scala library again and stumbled over your project. And wow I'm really surprised! This project is fucking genius! - The compile time errors for xpath expressions, the automatic and intelligent type conversions, how trivial it is to define implicit decoders, ... This is just great and all I ever wanted! Thanks a lot!
Is there actually an overview over all kantan libs/projects?
No overview yet, but the only directly useful ones are csv, xpath and regex
I’ve not updated them much recently because they’re pretty much done, but they could use a bit of love... just need to motivate myself
It's definitely useful. Over the last years I tried several different libraries to query XML files. Some provide static type checking but have a cumbersome syntax and some use the original xpath syntax but do not provide compile time errors or nice type conversions. Yours is as far as I know the only one that combines both, and in a very elegant way.
OK, if it's so far only csv, xpath, and regex, then I can also find them via your github page. I thought there are also projects for kantan.codecs and kantan.text because I've read those names in the suggested conversations. But OK.
In case that someone uses Intellij IDEA: I just added support for kantan.xpath to my plugin called Custom Postfix Templates. It allows you to easily expand
"//my/query".xpto
xp"//my/query"by automatically adding the following imports:
import kantan.xpath._
import kantan.xpath.implicits._Please let me know if I can improve these postfix templates.