Purely functional version of Kernighan and Ritchie’s wc program

WordCount.scala

/**
 * @author willtim
 * Purely functional version of Kernighan and Ritchie’s wc program
 * 
 * #include <stdio.h> 
 * #define IN 1 /* inside a word */ 
 * #define OUT 0 /* outside a word */
 * int blank(int c) { 
 *   return ( c==’ ’ || c==’\n’ || c==’\t’);
 * }
 * /* count words in input */ 
 * main() {
 *  int c, nw, state; 
 *   state = OUT; 
 *   nw = 0; 
 *   while ((c = getchar()) != EOF) { 
 *     if (blank(c)) state = OUT;
 *     else if (state == OUT) { 
 *       state = IN; 
 *       ++nw;
 *     } 
 *   } 
 *   printf("%d\n", nw); 
 * }
 */
object WordCount {

  def wc(s: String): Int = s.foldLeft((0, false)) {
    (t: (Int, Boolean), c: Char) => t match {
      case (n, _) if isBlank(c) => (n, false)
      case (n, true)            => (n, true)
      case (n, false)           => (n+1, true)
    }}._1
  
  def isBlank(c: Char) = c==' ' || c=='\n' || c=='\t'
    
  def main(args: Array[String]) {
      println { 
        wc(" the quick brown fox ")
      }
  }
}