Language detector of CodeAbbey

gistfile1.txt

function LanguageDetector() {
    function countCharacters(s) {
        var cnt = [];
        for (var i = 0; i < 256; i++) {
            cnt[i] = 0;
        }
        for (var j = 0; j < s.length; j++) {
            var c = s.charCodeAt(j);
            if (c >= 0 && c < 256) {
                cnt[i]++;
            }
        }
        return cnt;
    }

    this.detect = function(s) {
        var cnt = countCharacters(s);
        var len = s.length;
        var lenBf = s.replace(/[^\+\-\.\,\[\]\<\>\:\;\s]/g, '').length;
        if (lenBf / (len + 1) > 0.6 && s.indexOf('#include') < 0) {
            return 'Brainfuck';
        }
        if (s.indexOf('var ') >= 0) {
            return s.indexOf('using ') >= 0 ? 'C#' : 'JavaScript';
        }
        if (/\bdef\b/.test(s) && /\bend\b/.test(s)) {
            return 'Ruby';
        }
        var endLines = s.match(/[\,\;\{\}][\040\t]*[\n\r]/);
        endLines = endLines !== null ? endLines.length : 0;
        if (endLines / (cnt[10] + 1) > 0.4) {
            if (s.indexOf('#include') >= 0) {
                return 'C/C++';
            }
            if (/main\s*\(\s*String/.test(s)) {
                return 'Java';
            }
            if (cnt['$'.charCodeAt(0)] / len > 0.005) {
                return 'PHP';
            }
            return 'C#';
        } else {
            if (/\([\+\*]/.test(s)) {
                return 'LISP';
            }
            if (s.indexOf('dim ') >= 0) {
                return 'VB';
            }
            if (s.indexOf('local ') >= 0) {
                return 'Lua';
            }
            return 'Python';
        }
    }
}