Add ascii and utf8 interpolators

[armanbilge]

Wanted these at least a few times :)

scala> val b = ascii"deadbeef"
val b: scodec.bits.ByteVector = ByteVector(8 bytes, 0x6465616462656566)

scala> val b = utf8"ɟǝǝqpɐǝp"
val b: scodec.bits.ByteVector = ByteVector(13 bytes, 0xc99fc79dc79d7170c990c79d70)

[armanbilge]

Hmm, I suppose the naming is perhaps a bit overloaded. An ascii interpolator that enforces asciiness but returns a String could be another useful implementation I suppose (outside of scodec-bits of course).

[mpilquist]

We'd have to watch out for name conflicts at the very least. E.g., it's common to import both scodec.bits.* and scodec.codecs.*, the latter of which has ascii and utf8 defined as Codec[String].

[armanbilge]

I think the Scala compiler is capable of disambiguating that case actually.

//> using scala "2.12.16"
//> using lib "org.scodec::scodec-bits::1.1.34"

package object foo {
  def hex(args: String): Unit = ???
}

import scodec.bits._
import foo._

object Test {
  hex"deadbeef"
}

In any case, maybe asciiBytes and utf8Bytes would be more appropriate?

[armanbilge]

Not sure about this /shrug

[ChristopherDavenport]

Love this. Have this in a lot of cases and have wanted precisely this.