// $Id: albhed.in.js,v 1.3 2011/10/01 15:30:01 stephen Exp $

/*
 * English to Al Bhed translation toy
 *
 * Copyright (c) 2011 Stephen Williams, all rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the copyright holder may not be used to endorse or
 *    promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */


// map of English letters to Al Bhed letters
var e2a = new Object;
e2a['a'] = 'y'; e2a['b'] = 'p'; e2a['c'] = 'l'; e2a['d'] = 't';
e2a['e'] = 'a'; e2a['f'] = 'v'; e2a['g'] = 'k'; e2a['h'] = 'r';
e2a['i'] = 'e'; e2a['j'] = 'z'; e2a['k'] = 'g'; e2a['l'] = 'm';
e2a['m'] = 's'; e2a['n'] = 'h'; e2a['o'] = 'u'; e2a['p'] = 'b';
e2a['q'] = 'x'; e2a['r'] = 'n'; e2a['s'] = 'c'; e2a['t'] = 'd';
e2a['u'] = 'i'; e2a['v'] = 'j'; e2a['w'] = 'f'; e2a['x'] = 'q';
e2a['y'] = 'o'; e2a['z'] = 'w';

// map of Al Bhed letters to English letters
var a2e = new Object;
for (var letter in e2a)
   a2e[e2a[letter]] = letter;

// given a string and a map, replaces letters in the string
// with their equivalents in the map.  [ stops mapping and ]
// restarts.  Returns the result in a new string; does not
// modify the input string
function translate(s, map)
{
   var output = new Array;
   var passthrough = false;

   for (var i = 0, len = s.length; i < len; i++)
   {
      var c = s.charAt(i), l;

      if (!passthrough)
      {
	 if (c in map)
	    c = map[c];
	 else if ((l = c.toLowerCase()) in map)
	    c = map[l].toUpperCase()
	 else if (c == '[')
	    passthrough = true;
      }
      else if (c == ']')
	 passthrough = false;

      output.push(c);
   }

   return output.join('');
}

// extracts text from a text area source, translates it
// using the supplied map, and pastes it into the text
// area target
function translate_area(source, target, map)
{
   var original = source.value;
   var translated = translate(original, map);

   target.value = translated;
}

// English to Al Bhed is form 0; Al Bhed to English is form 1
var e2a_form = 0, a2e_form = 1;

// form submission hooks that return false to cancel submission
// so the translation runs entirely in the browser
function e2a_submit()
{
   translate_area(document.forms[e2a_form]['english'],
		  document.forms[a2e_form]['albhed'],
		  e2a);
   return false;
}
function a2e_submit()
{
   translate_area(document.forms[a2e_form]['albhed'],
		  document.forms[e2a_form]['english'],
		  a2e);
   return false;
}
document.forms[e2a_form].onsubmit = e2a_submit;
document.forms[a2e_form].onsubmit = a2e_submit;