JavaScript convert_cyr_string

Convert from one Cyrillic character set to another

function convert_cyr_string (str, from, to) {
    // Convert from one Cyrillic character set to another  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/convert_cyr_string    // +   original by: Brett Zamir (http://brett-zamir.me)
    // %          note 1: Assumes and converts to Unicode strings with character
    // %          note 1: code equivalents of the same numbers as in the from or
    // %          note 1: target character set; Note that neither the input or output
    // %          note 1: should be treated as actual Unicode, since the PHP function    // %          note 1: this is based on does not either
    // %          note 2: One could easily represent (or convert the results) of a
    // %          note 2: string form as arrays of code points instead but since JavaScript
    // %          note 2: currently has no clear binary data type, we chose to use strings
    // %          note 2: as in PHP    // *     example 1: convert_cyr_string(String.fromCharCode(214), 'k', 'w').charCodeAt(0) === 230; // Char. 214 of KOI8-R gives equivalent number value 230 in win1251
    // *     returns 1: true
    var _cyr_win1251 = [
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
46,46,46,46,46,46,46,46,46,46,46,46,46,46,46,46,
46,46,46,46,46,46,46,46,46,46,46,46,46,46,46,46,
154,174,190,46,159,189,46,46,179,191,180,157,46,46,156,183,
46,46,182,166,173,46,46,158,163,152,164,155,46,46,46,167,225,226,247,231,228,229,246,250,233,234,235,236,237,238,239,240,
242,243,244,245,230,232,227,254,251,253,255,249,248,252,224,241,
193,194,215,199,196,197,214,218,201,202,203,204,205,206,207,208,
210,211,212,213,198,200,195,222,219,221,223,217,216,220,192,209,
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
32,32,32,184,186,32,179,191,32,32,32,32,32,180,162,32,32,32,32,168,170,32,178,175,32,32,32,32,32,165,161,169,
254,224,225,246,228,229,244,227,245,232,233,234,235,236,237,238,
239,255,240,241,242,243,230,226,252,251,231,248,253,249,247,250,
222,192,193,214,196,197,212,195,213,200,201,202,203,204,205,206,
207,223,208,209,210,211,198,194,220,219,199,216,221,217,215,218,],
_cyr_cp866 = [
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,225,226,247,231,228,229,246,250,233,234,235,236,237,238,239,240,
242,243,244,245,230,232,227,254,251,253,255,249,248,252,224,241,
193,194,215,199,196,197,214,218,201,202,203,204,205,206,207,208,
35,35,35,124,124,124,124,43,43,124,124,43,43,43,43,43,
43,45,45,124,45,43,124,124,43,43,45,45,124,45,43,45,45,45,45,43,43,43,43,43,43,43,43,35,35,124,124,35,
210,211,212,213,198,200,195,222,219,221,223,217,216,220,192,209,
179,163,180,164,183,167,190,174,32,149,158,32,152,159,148,154,
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
205,186,213,241,243,201,32,245,187,212,211,200,190,32,247,198,
199,204,181,240,242,185,32,244,203,207,208,202,216,32,246,32,238,160,161,230,164,165,228,163,229,168,169,170,171,172,173,174,
175,239,224,225,226,227,166,162,236,235,167,232,237,233,231,234,
158,128,129,150,132,133,148,131,149,136,137,138,139,140,141,142,
143,159,144,145,146,147,134,130,156,155,135,152,157,153,151,154,
],_cyr_iso88595 = [
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
32,179,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
225,226,247,231,228,229,246,250,233,234,235,236,237,238,239,240,
242,243,244,245,230,232,227,254,251,253,255,249,248,252,224,241,
193,194,215,199,196,197,214,218,201,202,203,204,205,206,207,208,210,211,212,213,198,200,195,222,219,221,223,217,216,220,192,209,
32,163,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
32,32,32,241,32,32,32,32,32,32,32,32,32,32,32,32,
32,32,32,161,32,32,32,32,32,32,32,32,32,32,32,32,
238,208,209,230,212,213,228,211,229,216,217,218,219,220,221,222,223,239,224,225,226,227,214,210,236,235,215,232,237,233,231,234,
206,176,177,198,180,181,196,179,197,184,185,186,187,188,189,190,
191,207,192,193,194,195,182,178,204,203,183,200,205,201,199,202,
],
_cyr_mac = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
225,226,247,231,228,229,246,250,233,234,235,236,237,238,239,240,
242,243,244,245,230,232,227,254,251,253,255,249,248,252,224,241,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
144,145,146,147,148,149,150,151,152,153,154,155,156,179,163,209,
193,194,215,199,196,197,214,218,201,202,203,204,205,206,207,208,210,211,212,213,198,200,195,222,219,221,223,217,216,220,192,255,
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
160,161,162,222,164,165,166,167,168,169,170,171,172,173,174,175,
176,177,178,221,180,181,182,183,184,185,186,187,188,189,190,191,
254,224,225,246,228,229,244,227,245,232,233,234,235,236,237,238,
239,223,240,241,242,243,230,226,252,251,231,248,253,249,247,250,158,128,129,150,132,133,148,131,149,136,137,138,139,140,141,142,
143,159,144,145,146,147,134,130,156,155,135,152,157,153,151,154,
];
 
    var from_table = null, to_table = null, tmp, i=0, retStr = ''; 
    switch (from.toUpperCase()) {
        case 'W':
            from_table = _cyr_win1251;
            break;        case 'A':
        case 'D':
            from_table = _cyr_cp866;
            break;
        case 'I':            from_table = _cyr_iso88595;
            break;
        case 'M':
            from_table = _cyr_mac;
            break;        case 'K':
            break;
        default:
            throw 'Unknown source charset: '+from; // warning
            break;    }
 
    switch (to.toUpperCase()) {
        case 'W':
            to_table = _cyr_win1251;            break;
        case 'A':
        case 'D':
            to_table = _cyr_cp866;
            break;        case 'I':
            to_table = _cyr_iso88595;
            break;
        case 'M':
            to_table = _cyr_mac;            break;
        case 'K':
            break;
        default:
            throw 'Unknown destination charset: '+ to; // fix: make a warning    }
 
    if (!str) {
        return str;
    } 
    for (i = 0; i < str.length; i++) {
        tmp = (from_table === null)? str.charAt(i) : String.fromCharCode(from_table[ str.charAt(i).charCodeAt(0) ]);
        retStr += (to_table === null) ? tmp : String.fromCharCode(to_table[tmp.charCodeAt(0)+256]);
    }    return retStr;
}

external links: original PHP docs | raw js source

Examples

Running

1	convert_cyr_string(String.fromCharCode(214), 'k', 'w').charCodeAt(0) === 230; // Char. 214 of KOI8-R gives equivalent number value 230 in win1251

Should return

true

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

php.js uses JsLint to help us keep our code consistent and prevent some common bugs.

Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.