Javascript String wordWrap(m, b, c)

/*  /*from ww  w.  j a  v a  2s .com*/
 * JavaScript Document
 * Viewer
 * @author Amin Ghadersohi
 * @date 2012-Aug-13
 *
 *
 */

String.prototype.wordWrap = function (m, b, c) {
    var i, j, l, s, r;
    if (m < 1)
        return this;
    for (i = -1, l = (r = this.split("\n")).length; ++i < l; r[i] += s)
        for (s = r[i], r[i] = ""; s.length > m; r[i] += s.slice(0, j) + ((s = s.slice(j)).length ? b : ""))
            j = c == 2 || (j = s.slice(0, m + 1).match(/\S*(\s)?$/))[1] ? m : j.input.length - j[0].length || c == 1 && m || j.input.length + (j = s.slice(m).match(/^\S*/)).input.length;
    return r.join("\n");
};