OT: apply operation

gistfile1.js

var apply_operation = function(content, op) {
    var buffer = content.split('');
    var cursor = 0;
    op.forEach(function (action) {
        if (action.retain) {
            cursor += action.retain;
            // console.log('retain', '+'+action.retain, buffer.join(''), cursor);
        }
        else if (action.insert) {
            var args = [cursor, 0];
            args = args.concat(action.insert.split(''));
            buffer.splice.apply(buffer, args);
            cursor += action.insert.length;
            // console.log('insert', action.insert, buffer.join(''), cursor);
        }
        else if (action['delete']) {
            buffer.splice(cursor, action['delete']);
            // console.log('delete', action['delete'], buffer.join(''), cursor);
        }
    });
    return buffer.join('');
};

module.exports = apply_operation;