fm.common.rich.RichJVMString.scala Maven / Gradle / Ivy

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package fm.common.rich

import fm.common.Implicits._
import java.util.Locale
import java.util.function.IntConsumer // not scala-js compatible

final class RichJVMString(val s: String) extends AnyVal {
  // Parse a language tag to a locale - Using Locale.Builder() instead of Locale.forLanguageTag catches malformed strings
  def toLocaleOption: Option[Locale] = scala.util.Try{ new Locale.Builder().setLanguageTag(s).build() }.toOption.filter{ _.isValid }
  def toLocale: Locale = toLocaleOption.getOrElse(throw new Exception(s"Invalid locale language tag: $s"))

  // Note: java.util.function.IntConsumer is not scala-js compatible
  def toUnicodeEscapedJavaString: String = {
    if (null == s) return ""

    val sb: java.lang.StringBuilder = new java.lang.StringBuilder()

    // Using "new IntConsumer ..." maintains Scala 2.11.x compatibility
    s.codePoints().forEach(new IntConsumer {
      override def accept(codepoint: Int): Unit = appendUnicodeEscapedSequence(sb, codepoint)
    })

    sb.toString()
  }

  // Note: java.util.function.IntConsumer is not scala-js compatible
  def toUnicodeEscapedJavaStringExceptASCII: String = {
    if (null == s) return ""

    val sb: java.lang.StringBuilder = new java.lang.StringBuilder()

    // Using "new IntConsumer ..." maintains Scala 2.11.x compatibility
    s.codePoints().forEach(new IntConsumer {
      override def accept(codepoint: Int): Unit = {
        if (codepoint < 128 && !Character.isISOControl(codepoint)) sb.appendCodePoint(codepoint)
        else appendUnicodeEscapedSequence(sb, codepoint)
      }
    })

    sb.toString()
  }

  private def appendUnicodeEscapedSequence(sb: java.lang.StringBuilder, codepoint: Int): Unit = {
    if (Character.isSupplementaryCodePoint(codepoint)) {
      sb.append("\\u"+String.format("%04X", Character.highSurrogate(codepoint).toInt: Integer))
      sb.append("\\u"+String.format("%04X", Character.lowSurrogate(codepoint).toInt: Integer))
    } else {
      sb.append("\\u"+String.format("%04X", codepoint: Integer))
    }
  }
}