language: JavaScript (rhino) (rhino-1.7R4)
date: 619 days 12 hours ago
link:
visibility: public 
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var _Detab = function(text) {
// attacklab: Detab's completely rewritten for speed.
// In perl we could fix it by anchoring the regexp with \G.
// In javascript we're less fortunate.
 
        // expand first n-1 tabs
        text = text.replace(/\t(?=\t)/g,"    "); // attacklab: g_tab_width
 
        // replace the nth with two sentinels
        text = text.replace(/\t/g,"~A~B");
 
        // use the sentinel to anchor our regex so it doesn't explode
        text = text.replace(/~B(.+?)~A/g,
                function(wholeMatch,m1,m2) {
                        var leadingText = m1;
                        var numSpaces = 4 - leadingText.length % 4;  // attacklab: g_tab_width
 
                        // there *must* be a better way to do this:
                        for (var i=0; i<numSpaces; i++) leadingText+=" ";
 
                        return leadingText;
                }
        );
 
        // clean up sentinels
        text = text.replace(/~A/g,"    ");  // attacklab: g_tab_width
        text = text.replace(/~B/g,"");
 
        return text;
}
 
print (_Detab("Where\tis pancakes house?") + " " + _Detab("Where\tis pancakes house?").length);