[Developers] mql_escape and UTF-8

[Will Moffat]

Hello,

> what would really help is if you could produce some code to do the  
> escaping/unescaping on some of the more popular languages.

Here are some Javascript functions which should help.
Please let me know if you find any bugs or make any improvements.

regards,
--Will


function str2key(key) {
     // key may only contain letters, numbers, underscores, hyphens
     return key.replace( /[^A-Za-z0-9_-]/g, _dollarEscape );
}

function key2str(str) {
     //match a 4-digit hex number starting with $
     return str.replace(/\$([0-9a-f]{4})/gi,function(match,hex) {
         return String.fromCharCode( parseInt(hex,16 ));
     });
}


function _dollarEscape(aChar) {
     var hex = aChar.charCodeAt(0).toString(16).toUpperCase();
     if (hex.length==1) { return "$000"+hex; }
     if (hex.length==2) { return "$00" +hex; }
     if (hex.length==3) { return "$0"  +hex; }
     if (hex.length==4) { return "$"   +hex; }
     return null;
}

// tests:
print(key2str('Andrew_$0022Test$0022_Martin'))
print(key2str('Gabriel_Garc$00EDa_M$00E1rquez'))

print(str2key('Béla_Szőkefalvi-Nagy'))
print(key2str('B$00E9la_Sz$0151kefalvi-Nagy'))