A simple demo to count all the space-delimited words in a file. Usage: counter <filename>

counter.groovy

#!/usr/bin/env groovy

// A simple demo to count all the space-delimited words in a file.
//     Usage:  counter <filename>
class Counter {
  // A list of sets.  Words of length L are stored in words[L].  All words are
  // stored as lowercase.
  List<Set> words = []

  void run( args ) {
    if ( args.size() < 1 ) {
      println "Usage:  counter <filename>"
      return
    }
    File file  = new File( args[0] )

    println ""
    println "Loading: " + file.getCanonicalPath()
    List fileWords = file.text.tokenize()
    int maxLen = fileWords*.size().max()
    // Init empty words structure
    words = []
    for ( int ii in (0 .. maxLen) ) {
      words[ii] = new HashSet()
    }

    int totalWords = 0;
    fileWords.each { word ->
      def wordLen = word.size()
      def wordLower = word.toLowerCase() 
      words[ wordLen ] << wordLower
      totalWords++ 
    }

    println()
    words.eachWithIndex { wordSet, idx ->
      int numWords = wordSet.size()
      println "$idx".padLeft(5) + ": " + "${numWords}".padLeft(7) + " words" 
    }
  }

  static main(args) {
    new Counter().run( args )
  }
}