neo-char-seq.kt

package com.alexshabanov.neocharseq

trait Str {

  /** Appends the contents of this stream. */
  fun appendTo(stream: Appendable)

  fun charAt(pos: Int): Char

  fun length(): Int

  fun subSeq(start: Int, end: Int): Str

  //
  // Helper methods (auto implemented)
  //

  /** Returns char sequence representation, optimized for random access. */
  fun forRandomAccess(): Str = this

  fun indexOf(ch: Char): Int {
    // implementation goes here...
    val s = forRandomAccess()
    var i = 0
    val len = s.length()
    while (i < len) {
      if (s.charAt(i) == ch) {
        return i
      }
    }
    return -1
  }
}

class StandardStr(val chars: Array<Char>): Str {
  override fun appendTo(stream: Appendable) {
    throw UnsupportedOperationException()
  }

  override fun charAt(pos: Int)= chars[pos]

  override fun length() = chars.size

  override fun subSeq(start: Int, end: Int): Str {
    throw UnsupportedOperationException()
  }

}

class Latin1Str(val byte: Array<Byte>): Str {

  override fun appendTo(stream: Appendable) {
    throw UnsupportedOperationException()
  }

  override fun charAt(pos: Int): Char {
    throw UnsupportedOperationException()
  }

  override fun length(): Int {
    throw UnsupportedOperationException()
  }

  override fun subSeq(start: Int, end: Int): Str {
    throw UnsupportedOperationException()
  }
}