String#codePoints does not compile on scala.js

[pontaoski]

val codepoints: Array[Int] = "foo".codePoints.toArray

[error] Referring to non-existent method java.util.stream.IntStream.toArray()[int
[error]   dispatched from java.util.stream.IntStream.toArray()[int
[error]   called from private static Shades.StringStore.idsSortedAccordingTo$$anonfun$1$$anonfun$1(scala.collection.immutable.Map,scala.Tuple2,scala.Tuple2)boolean
[error]   called from private static Shades.StringStore.idsSortedAccordingTo$$anonfun$1(scala.collection.immutable.Map,scala.collection.immutable.SortedMap)scala.collection.immutable.List
[error]   called from Shades.StringStore.idsSortedAccordingTo(scala.collection.immutable.Map)fs2.concurrent.Signal
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2$$anonfun$2$$anonfun$8(Shades.StringStore,scala.Option)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2$$anonfun$2(Shades.StringStore,fs2.concurrent.Channel,fs2.concurrent.Signal)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2(Shades.StringStore,fs2.concurrent.Channel)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3(Shades.StringStore)cats.effect.kernel.Resource
[error]   called from Shades.Main$.render()cats.effect.kernel.Resource
[error]   dispatched from calico.IOWebApp.render()cats.effect.kernel.Resource
[error]   called from private calico.IOWebApp.main$$anonfun$1(org.scalajs.dom.Element)cats.effect.IO
[error]   called from calico.IOWebApp.main([java.lang.String)void
[error]   called from Shades.Main$.main([java.lang.String)void
[error]   called from static Shades.Main.main([java.lang.String)void
[error]   called from core module module initializers
[error] involving instantiated classes:
[error]   Shades.StringStore
[error]   Shades.Main$
[error] Referring to non-existent class java.util.stream.IntStream
[error]   called from private static Shades.StringStore.idsSortedAccordingTo$$anonfun$1$$anonfun$1(scala.collection.immutable.Map,scala.Tuple2,scala.Tuple2)boolean
[error]   called from private static Shades.StringStore.idsSortedAccordingTo$$anonfun$1(scala.collection.immutable.Map,scala.collection.immutable.SortedMap)scala.collection.immutable.List
[error]   called from Shades.StringStore.idsSortedAccordingTo(scala.collection.immutable.Map)fs2.concurrent.Signal
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2$$anonfun$2$$anonfun$8(Shades.StringStore,scala.Option)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2$$anonfun$2(Shades.StringStore,fs2.concurrent.Channel,fs2.concurrent.Signal)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2(Shades.StringStore,fs2.concurrent.Channel)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3(Shades.StringStore)cats.effect.kernel.Resource
[error]   called from Shades.Main$.render()cats.effect.kernel.Resource
[error]   dispatched from calico.IOWebApp.render()cats.effect.kernel.Resource
[error]   called from private calico.IOWebApp.main$$anonfun$1(org.scalajs.dom.Element)cats.effect.IO
[error]   called from calico.IOWebApp.main([java.lang.String)void
[error]   called from Shades.Main$.main([java.lang.String)void
[error]   called from static Shades.Main.main([java.lang.String)void
[error]   called from core module module initializers
[error] involving instantiated classes:
[error]   Shades.StringStore
[error]   Shades.Main$
[error] Referring to non-existent method java.lang.String.codePoints()java.util.stream.IntStream
[error]   dispatched from java.lang.String.codePoints()java.util.stream.IntStream
[error]   called from private static Shades.StringStore.idsSortedAccordingTo$$anonfun$1$$anonfun$1(scala.collection.immutable.Map,scala.Tuple2,scala.Tuple2)boolean
[error]   called from private static Shades.StringStore.idsSortedAccordingTo$$anonfun$1(scala.collection.immutable.Map,scala.collection.immutable.SortedMap)scala.collection.immutable.List
[error]   called from Shades.StringStore.idsSortedAccordingTo(scala.collection.immutable.Map)fs2.concurrent.Signal
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2$$anonfun$2$$anonfun$8(Shades.StringStore,scala.Option)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2$$anonfun$2(Shades.StringStore,fs2.concurrent.Channel,fs2.concurrent.Signal)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3$$anonfun$2(Shades.StringStore,fs2.concurrent.Channel)cats.effect.kernel.Resource
[error]   called from private Shades.Main$.render$$anonfun$3(Shades.StringStore)cats.effect.kernel.Resource
[error]   called from Shades.Main$.render()cats.effect.kernel.Resource
[error]   dispatched from calico.IOWebApp.render()cats.effect.kernel.Resource
[error]   called from private calico.IOWebApp.main$$anonfun$1(org.scalajs.dom.Element)cats.effect.IO
[error]   called from calico.IOWebApp.main([java.lang.String)void
[error]   called from Shades.Main$.main([java.lang.String)void
[error]   called from static Shades.Main.main([java.lang.String)void
[error]   called from core module module initializers
[error] involving instantiated classes:
[error]   Shades.StringStore
[error]   Shades.Main$
[error] There were linking errors

scala: 3.3.1
scalajs: 1.15.0

[ekrich]

Is it possible to use a different method to get the codepoints? Maybe something like the following could work?

scala> "A\u00ea\u00f1\u00fcC".map(_.toInt).toArray
res4: Array[Int] = Array(65, 234, 241, 252, 67)

scala> res4.map(_.toChar)
res6: Array[Char] = Array(A, ê, ñ, ü, C)

The method codePoints was added in Java 9 and it requires the java.util.stream API which is a big lift.

[gzm0]

Heads up: char != code point (look up surrogate pairs for more, sorry for the brief comment, on mobile)

[sjrd]

Java Streams are not supported and will most likely never be. They inherently require parallel capabilities. So Stream-related methods like codePoints cannot be supported either.

Use String.codePointAt and Character.charCount to iterate over the code points of a String.

[gzm0]

Java Streams are not supported and will most likely never be. They inherently require parallel capabilities.

Huh, this is the first time I'm hearing this.

Feels like a pretty severe limitation we should document? (that we cannot support streams. I mean I realize that it for sure is a lot of work).

[sjrd]

I don't remember exactly what led me to that conclusion, but I remember I had already looked at it and it seemed unavoidable.

[sjrd]

Reopening but depends on #4926.