/**
   Farsi Keyboad Mapper
   JavaScript

   TODO:  FireFox & Netscape Implementation
   FIXME: different key maps in Farsi mode: ISIRI-2901 vs OS keymap
*/

var lang = 1;	  // 1: Farsi, 0: English

var farsikey = [  // Farsi keyboard map based on ISIRI-2901
    0x0020, 0x0021, 0x061B, 0x066B, 0x00A4, 0x066A, 0x060C, 0x06AF,
    0x0029, 0x0028, 0x002A, 0x002B, 0x0648, 0x002D, 0x002E, 0x002F,
    0x06F0, 0x06F1, 0x06F2, 0x06F3, 0x06F4, 0x06F5, 0x06F6, 0x06F7,
    0x06F8, 0x06F9, 0x003A, 0x06A9, 0x003E, 0x003D, 0x003C, 0x061F,
    0x066C, 0x0624, 0x200C, 0x0698, 0x064A, 0x064D, 0x0625, 0x0623,
    0x0622, 0x0651, 0x0629, 0x00BB, 0x00AB, 0x0621, 0x004E, 0x005D,
    0x005B, 0x0652, 0x064B, 0x0626, 0x064F, 0x064E, 0x0056, 0x064C,
    0x0058, 0x0650, 0x0643, 0x062C, 0x067E, 0x0686, 0x00D7, 0x0640,
    0x200D, 0x0634, 0x0630, 0x0632, 0x06CC, 0x062B, 0x0628, 0x0644,
    0x0627, 0x0647, 0x062A, 0x0646, 0x0645, 0x067E, 0x062F, 0x062E,
    0x062D, 0x0636, 0x0642, 0x0633, 0x0641, 0x0639, 0x0631, 0x0635,
    0x0637, 0x063A, 0x0638, 0x007D, 0x007C, 0x007B, 0x007E
];

function FKeyDown() {
    if (!document.all)        // Netscape, FireFox: nothing to do!
        return false;
    if (window.event.shiftKey && window.event.altKey) { // on Alt+Shift, switch language
        if (lang == 0) {
            lang = 1;
            window.defaultStatus = "Farsi Mode";
        } else {
            lang = 0;
            window.defaultStatus = "English Mode";
        }
        return false;
    }
    return true;
}


function FKeyPress() {
    if (!document.all)           // Netscape, FireFox: nothing to do!
        return false;
    var key = window.event.keyCode;
    if (key < 0x0020)            // Avoid processing if control char
        return true;
    else if (key >= 0x00FF) {    // When Farsi Support is available (XP, 2000, ...)
        if (lang == 0) {         // Change lang if still is English
           lang = 1;
           window.defaultStatus = "Farsi Mode";
       }
    } else if (lang == 1) {      // If lang is Farsi change the key code
       if (key == 0x0020 && window.event.shiftKey)  // Shift-space -> ZWNJ
           window.event.keyCode = 0x200C;
      else
           window.event.keyCode = farsikey[key - 0x0020];
    }
    return true;
}