Encode Emoji with Custom Embedding

EmojiEncoding.scala

import cats.syntax.all._

object EmojiEncoding {

  private val range_min = 127744
  private val range_max = 129782

  private val range_min_2 = 126980
  private val range_max_2 = 127569
  private val range_min_3 = 169
  private val range_max_3 = 174
  private val range_min_4 = 8205
  private val range_max_4 = 12953

  def isEmojiCharCode(char_code: Int): Boolean = {
    if (range_min <= char_code && char_code <= range_max) true
    else if (range_min_2 <= char_code && char_code <= range_max_2) true
    else if (range_min_3 <= char_code && char_code <= range_max_3) true
    else if (range_min_4 <= char_code && char_code <= range_max_4) true
    else false 
  }

  def encodeUnicodeFromEmoji(s: String): String = {
    s.codePoints.toArray.map( i => 
      if (isEmojiCharCode(i)) {
        "U+" +i.toHexString.toUpperCase()
      } else new String(Array(i), 0, 1)
    ).mkString
  }

  val EmojiUnicode = "U\\+([0-9a-fA-F]{4,5})".r

  private def codePointForHex(hexString: String): Int = {
    val i = Integer.parseInt(hexString, 16)
    i
  }

  private def codePointToString(i: Int): String = new String(Array(i), 0, 1)

  private def encodeEmoji(hexString: String): String = codePointToString(codePointForHex(hexString))

  def encodeEmojiFromUCodes(base: String): String = {
    EmojiUnicode.replaceAllIn(base, {m: scala.util.matching.Regex.Match => 
      encodeEmoji(m.group(1))}
    )
  }
}