// file: translit.js

// Herve Saint-Amand
// Saarbruecken
// Sun Sep  3 18:36:22 2006

//-----------------------------------------------------------------------------

var translit_chars = {

    // combinaisons
    'tS': '\u0442\u0441',

    // majuscules
    'Yo': '\u0401',
    'YO': '\u0401',
    'Zh': '\u0416',
    'ZH': '\u0416',
    'Kh': '\u0425',
    'KH': '\u0425',
    'H':  '\u0425',
    'X':  '\u0425',
    'Ts': '\u0426',
    'TS': '\u0426',
    'Shch': '\u0429',
    'SHCH': '\u0429',
    'Ch': '\u0427',
    'CH': '\u0427',
    'Sh': '\u0428',
    'SH': '\u0428',
    'Yu': '\u042E',
    'YU': '\u042E',
    'Ya': '\u042F',
    'YA': '\u042F',

    // majuscules
    'A': '\u0410',
    'B': '\u0411',
    'V': '\u0412',
    'W': '\u0412',
    'G': '\u0413',
    'D': '\u0414',
    'E': '\u0415',
    'Z': '\u0417',
    'I': '\u0418',
    'J': '\u0419',
    'K': '\u041A',
    'L': '\u041B',
    'M': '\u041C',
    'N': '\u041D',
    'O': '\u041E',
    'P': '\u041F',
    'R': '\u0420',
    'S': '\u0421',
    'T': '\u0422',
    'U': '\u0423',
    'F': '\u0424',
    'Y': '\u042B',
    '`E': '\u042D',

    // minuscules
    'zh': '\u0436',
    'x':  '\u0445',
    'kh': '\u0445',
    'h':  '\u0445',
    'ts': '\u0446',
    'shch': '\u0449',
    'ch': '\u0447',
    'sh': '\u0448',
    'yu': '\u044E',
    'ya': '\u044F',
    'yo': '\u0451',

    // minuscules
    '`e': '\u044D',
    'a': '\u0430',
    'b': '\u0431',
    'v': '\u0432',
    'w': '\u0432',
    'g': '\u0433',
    'd': '\u0434',
    'e': '\u0435',
    'z': '\u0437',
    'i': '\u0438',
    'j': '\u0439',
    'k': '\u043A',
    'l': '\u043B',
    'm': '\u043C',
    'n': '\u043D',
    'o': '\u043E',
    'p': '\u043F',
    'r': '\u0440',
    's': '\u0441',
    't': '\u0442',
    'u': '\u0443',
    'f': '\u0444',
    'y': '\u044B',

    // autres
    '`': '\u044A',
    "'": '\u044C'

};

//-----------------------------------------------------------------------------
// main

var elTextIn;
var elTextOut;

var max;

function onLoad () {
    elTextIn  = document.getElementById ('textIn');
    elTextOut = document.getElementById ('textOut');

    max = 0;
    for (i in translit_chars) {
        if (i.length > max)
            max = i.length;
    }

    // see if we have some initial text passed from the URL
    var href = location.href;
    var argp = '?text=';
    var i = href.indexOf (argp);
    if (i > 0) {
        var iniText = href.substring (i + argp.length);
        elTextIn.value = unescape (iniText);
        translit ();
        elTextOut.select ();

    // if not, focus input text area
    } else {
        elTextIn.focus ();
    }
}

function translit () {
    var textIn  = elTextIn.value;
    var textOut = '';

    var l = textIn.length;
    var c, p, o, f, n;

    var i = 0;
    while (i < l) {
        f = false;

        // \Q ... \E escapes
        if (i+4 < l && textIn.substring (i, i+2) == "\\Q") {
            n = textIn.indexOf ("\\E", i+2);
            if (n > 0) {
                textOut += textIn.substring (i+2, n);
                i = n+2;
                continue;
            }
        }

        for (c = max; c > 0; c--) {
            if (i+c <= l) {
                p = textIn.substring (i, i+c);
                o = translit_chars[p];
                if (o != null) {
                    textOut += o;
                    i += c;
                    f = true;
                    break;
                }
            }
        }

        if (!f) {
            textOut += textIn.substring (i, i+1);
            i++;
        }
    }

    elTextOut.value = textOut;
}

//-----------------------------------------------------------------------------