Script to convert any Regenerate set to code that generates it

[mathiasbynens]

This is not really a bug report, but rather a script that is useful when generating test cases:

regenerate.prototype.toCode = function() {
    var data = this.data;
    // Iterate over the data per `(start, end)` pair.
    var index = 0;
    var start;
    var end;
    var length = data.length;
    var loneCodePoints = [];
    var ranges = [];
    while (index < length) {
        start = data[index];
        end = data[index + 1] - 1; // Note: the `- 1` makes `end` inclusive.
        if (start == end) {
            loneCodePoints.push('0x' + start.toString(16).toUpperCase());
        } else {
            ranges.push(
                'addRange(0x' + start.toString(16).toUpperCase() +
                ', 0x' + end.toString(16).toUpperCase() + ')'
            );
        }
        index += 2;
    }
    return 'regenerate(' + loneCodePoints.join(', ') + ')' +
        (ranges.length ? '.' + ranges.join('.') : '');
};

var set = regenerate(0x1D306, 'a').addRange(0x2CEE, 0x4DFF);
console.log(set.toCode());
// → 'regenerate(0x61, 0x1D306).addRange(0x2CEE, 0x4DFF)'

Let’s allow extending regenerate.prototype for plugins like this.