recursively break text into digestable tweets

gistfile1.js

/**
 * finds the index to substr on. looks for space from end of string
 * @param string
 * @return int
 */
var calculateIndex = function(value) {
    
    var index = value.substr(0,TWEET_SIZE).lastIndexOf(" ");
    if (index < 1 || value.length < TWEET_SIZE) {
        index = TWEET_SIZE;
    }
    return index;
};

/**
 * processes the tweet, recursive, pass in the array to collect the pieces
 * @param string value The text to break up.
 * 
 * @return array
 */
var process = function(value, collector) {
    
    collector = collector || [];
    
    if(1 > value.length){ 
        //Fix elipsis
        Y.Array.each(collector, function(v,i,a) {
            if(a.length != (i+1)) {
                a[i] = v + CONTINUE_MARKER;
            }            
        });
        
        return collector; 
    }
    
    var index = calculateIndex(value);
    collector.push(value.substr(0,index));

    return process(value.substr(index), collector);
    
};