Version 3.18.1
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File: loader/js/rollup.js

            /**
             * Optional automatic rollup logic for reducing http connections
             * when not using a combo service.
             * @module loader
             * @submodule rollup
             */
            
            /**
             * Look for rollup packages to determine if all of the modules a
             * rollup supersedes are required.  If so, include the rollup to
             * help reduce the total number of connections required.  Called
             * by calculate().  This is an optional feature, and requires the
             * appropriate submodule to function.
             * @method _rollup
             * @for Loader
             * @private
             */
            Y.Loader.prototype._rollup = function() {
                var i, j, m, s, r = this.required, roll,
                    info = this.moduleInfo, rolled, c, smod;
            
                // find and cache rollup modules
                if (this.dirty || !this.rollups) {
                    this.rollups = {};
                    for (i in info) {
                        if (info.hasOwnProperty(i)) {
                            m = this.getModule(i);
                            // if (m && m.rollup && m.supersedes) {
                            if (m && m.rollup) {
                                this.rollups[i] = m;
                            }
                        }
                    }
                }
            
                // make as many passes as needed to pick up rollup rollups
                for (;;) {
                    rolled = false;
            
                    // go through the rollup candidates
                    for (i in this.rollups) {
                        if (this.rollups.hasOwnProperty(i)) {
                            // there can be only one, unless forced
                            if (!r[i] && ((!this.loaded[i]) || this.forceMap[i])) {
                                m = this.getModule(i);
                                s = m.supersedes || [];
                                roll = false;
            
                                // @TODO remove continue
                                if (!m.rollup) {
                                    continue;
                                }
            
                                c = 0;
            
                                // check the threshold
                                for (j = 0; j < s.length; j++) {
                                    smod = info[s[j]];
            
                                    // if the superseded module is loaded, we can't
                                    // load the rollup unless it has been forced.
                                    if (this.loaded[s[j]] && !this.forceMap[s[j]]) {
                                        roll = false;
                                        break;
                                    // increment the counter if this module is required.
                                    // if we are beyond the rollup threshold, we will
                                    // use the rollup module
                                    } else if (r[s[j]] && m.type === smod.type) {
                                        c++;
                                        // Y.log("adding to thresh: " + c + ", " + s[j]);
                                        roll = (c >= m.rollup);
                                        if (roll) {
                                            // Y.log("over thresh " + c + ", " + s[j]);
                                            break;
                                        }
                                    }
                                }
            
                                if (roll) {
                                    // Y.log("adding rollup: " +  i);
                                    // add the rollup
                                    r[i] = true;
                                    rolled = true;
            
                                    // expand the rollup's dependencies
                                    this.getRequires(m);
                                }
                            }
                        }
                    }
            
                    // if we made it here w/o rolling up something, we are done
                    if (!rolled) {
                        break;
                    }
                }
            };