//********************************************************************
// A Pig Latin Translator by Lewis and Loftus (2001) - for Lab #7
//********************************************************************
// Modified by Ian! D. Allen www.idallen.com from the original at
// http://www.it-c.dk/courses/GP/F2001/Eksempler/JavaSoftwareSolutions/chap04/PigLatinTranslator.java
//
// Students do NOT have to add further comments to this file.
//
// Class Usage:
//   PigLatinTranslator plt;
//   plt = new PigLatinTranslator();
//   line = plt.translate(line);        // line is a String
//
// Command line Usage (reads from standard input):
//   $ java PigLatinTranslator <inputfile.txt
//
// -Ian! idallen@idallen.ca - www.idallen.com - Winter 2007
//********************************************************************

//********************************************************************
//  PigLatinTranslator.java       Author: Lewis and Loftus
//
//  Represents a translation system from English to Pig Latin.
//  Demonstrates method decomposition and the use of StringTokenizer.
//********************************************************************

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;

public class PigLatinTranslator {
	private static PigLatinTranslator plt;

	// -----------------------------------------------------------------
	// a main for testing this class - it reads stdin and writes stdout
	// -----------------------------------------------------------------
	public static void main(String[] args) {
		if (args.length != 0) {
			System.err.println(
				"Usage: java PigLatinTranslator <inputfile");
			System.exit(-1);
		}
		plt = new PigLatinTranslator();
		try {
			System.err.println("Enter lines of text" +
				" followed by EOF (usually CTRL-D):");
			plt.filter();
		} catch (IOException e) {
			System.err.println(e);
		}
	}

	// -----------------------------------------------------------------
	// Read lines from stream stdin and write lines to stream stdout.
	// The translator is line-based (words), not byte-based.
	// -----------------------------------------------------------------
	private void filter() throws IOException {
		BufferedReader r = new BufferedReader(
			new InputStreamReader(System.in));
		BufferedWriter w = new BufferedWriter(
			new OutputStreamWriter(System.out));
		String line;
		while ((line = r.readLine()) != null) {
			line = plt.translate(line);
			w.write(line);
			w.newLine();
		}
		r.close();
		w.close();
	}

	// -----------------------------------------------------------------
	// Translates a sentence of words into Pig Latin.
	// -----------------------------------------------------------------
	public String translate(String sentence) {
		String result = "";

		sentence = sentence.toLowerCase();
		StringTokenizer tokenizer = new StringTokenizer(sentence);

		while (tokenizer.hasMoreTokens()) {
			result += translateWord(tokenizer.nextToken());
			result += " ";
		}

		return result;
	}

	// -----------------------------------------------------------------
	// Translates one word into Pig Latin. If the word begins with a
	// vowel, the suffix "yay" is appended to the word. Otherwise,
	// the first letter or two are moved to the end of the word,
	// and "ay" is appended.
	// -----------------------------------------------------------------
	private String translateWord(String word) {
		String result = "";

		if (beginsWithVowel(word))
			result = word + "yay";
		else if (beginsWithPrefix(word))
			result = word.substring(2) + word.substring(0, 2) + "ay";
		else
			result = word.substring(1) + word.charAt(0) + "ay";

		return result;
	}

	// -----------------------------------------------------------------
	// Determines if the specified word begins with a vowel.
	// -----------------------------------------------------------------
	private boolean beginsWithVowel(String word) {
		String vowels = "aeiouAEIOU";

		char letter = word.charAt(0);

		return (vowels.indexOf(letter) != -1);
	}

	// -----------------------------------------------------------------
	// Determines if the specified word begins with a particular
	// two-character prefix.
	// -----------------------------------------------------------------
	private boolean beginsWithPrefix(String str) {
		return (str.startsWith("bl") || str.startsWith("pl")
				|| str.startsWith("br") || str.startsWith("pr")
				|| str.startsWith("ch") || str.startsWith("sh")
				|| str.startsWith("cl") || str.startsWith("sl")
				|| str.startsWith("cr") || str.startsWith("sp")
				|| str.startsWith("dr") || str.startsWith("sr")
				|| str.startsWith("fl") || str.startsWith("st")
				|| str.startsWith("fr") || str.startsWith("th")
				|| str.startsWith("gl") || str.startsWith("tr")
				|| str.startsWith("gr") || str.startsWith("wh")
				|| str.startsWith("kl") || str.startsWith("wr") || str
				.startsWith("ph"));
	}
}