/**
* 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// if the superseded module is loaded, we can't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;
}
}
};