BaseBuild.js revision af716e785a91e92d5cfa85d40fdd10a30f94751f
b37bdfc58ac6a28db9af61b710fff27e6975d3feRyan Grove /**
* The base-build submodule provides Base.build functionality, which
* can be used to create custom classes, by aggregating extensions onto
* a main class.
*
* @module base
* @submodule base-build
* @for Base
*/
var Base = Y.Base,
L = Y.Lang,
build;
Base._build = function(name, main, extensions, px, sx, cfg) {
var build = Base._build,
builtClass = build._ctor(main, cfg),
buildCfg = build._cfg(main, cfg),
_mixCust = build._mixCust,
aggregates = buildCfg.aggregates,
custom = buildCfg.custom,
dynamic = builtClass._yuibuild.dynamic,
i, l, val, extClass;
if (dynamic && aggregates) {
for (i = 0, l = aggregates.length; i < l; ++i) {
val = aggregates[i];
if (main.hasOwnProperty(val)) {
builtClass[val] = L.isArray(main[val]) ? [] : {};
}
}
}
// Augment/Aggregate
for (i = 0, l = extensions.length; i < l; i++) {
extClass = extensions[i];
// Prototype, old non-displacing augment
Y.mix(builtClass, extClass, true, null, 1);
// Custom Statics
_mixCust(builtClass, extClass, aggregates, custom);
builtClass._yuibuild.exts.push(extClass);
}
if (px) {
Y.mix(builtClass.prototype, px, true);
}
if (sx) {
Y.mix(builtClass, build._clean(sx, aggregates, custom), true);
_mixCust(builtClass, sx, aggregates, custom);
}
builtClass.prototype.hasImpl = build._impl;
if (dynamic) {
builtClass.NAME = name;
builtClass.prototype.constructor = builtClass;
}
return builtClass;
};
build = Base._build;
Y.mix(build, {
_mixCust: function(r, s, aggregates, custom) {
if (aggregates) {
Y.aggregate(r, s, true, aggregates);
}
if (custom) {
for (var j in custom) {
if (custom.hasOwnProperty(j)) {
custom[j](j, r, s);
}
}
}
},
_tmpl: function(main) {
function BuiltClass() {
BuiltClass.superclass.constructor.apply(this, arguments);
}
Y.extend(BuiltClass, main);
return BuiltClass;
},
_impl : function(extClass) {
var classes = this._getClasses(), i, l, cls, exts, ll, j;
for (i = 0, l = classes.length; i < l; i++) {
cls = classes[i];
if (cls._yuibuild) {
exts = cls._yuibuild.exts;
ll = exts.length;
for (j = 0; j < ll; j++) {
if (exts[j] === extClass) {
return true;
}
}
}
}
return false;
},
_ctor : function(main, cfg) {
var dynamic = (cfg && false === cfg.dynamic) ? false : true,
builtClass = (dynamic) ? build._tmpl(main) : main;
builtClass._yuibuild = {
id: null,
exts : [],
dynamic: dynamic
};
return builtClass;
},
_cfg : function(main, cfg) {
var aggr = [],
cust = {},
buildCfg,
cfgAggr = (cfg && cfg.aggregates),
cfgCustBuild = (cfg && cfg.custom),
c = main;
while (c && c.prototype) {
buildCfg = c._buildCfg;
if (buildCfg) {
if (buildCfg.aggregates) {
aggr = aggr.concat(buildCfg.aggregates);
}
if (buildCfg.custom) {
Y.mix(cust, buildCfg.custom, true);
}
}
c = c.superclass ? c.superclass.constructor : null;
}
if (cfgAggr) {
aggr = aggr.concat(cfgAggr);
}
if (cfgCustBuild) {
Y.mix(cust, cfg.cfgBuild, true);
}
return {
aggregates: aggr,
custom: cust
};
},
_clean : function(sx, aggregates, custom) {
var prop, i, l, sxclone = Y.merge(sx);
for (prop in custom) {
if (sxclone.hasOwnProperty(prop)) {
delete sxclone[prop];
}
}
for (i = 0, l = aggregates.length; i < l; i++) {
prop = aggregates[i];
if (sxclone.hasOwnProperty(prop)) {
delete sxclone[prop];
}
}
return sxclone;
}
});
/**
* <p>
* Builds a custom constructor function (class) from the
* main function, and array of extension functions (classes)
* provided. The NAME field for the constructor function is
* defined by the first argument passed in.
* </p>
* <p>
* The cfg object supports the following properties
* </p>
* <dl>
* <dt>dynamic &#60;boolean&#62;</dt>
* <dd>
* <p>If true (default), a completely new class
* is created which extends the main class, and acts as the
* host on which the extension classes are augmented.</p>
* <p>If false, the extensions classes are augmented directly to
* the main class, modifying the main class' prototype.</p>
* </dd>
* <dt>aggregates &#60;String[]&#62;</dt>
* <dd>An array of static property names, which will get aggregated
* on to the built class, in addition to the default properties build
* will always aggregate as defined by the main class' static _buildCfg
* property.
* </dd>
* </dl>
*
* @method Base.build
* @deprecated Use the more convenient Base.create and Base.mix methods instead
* @static
* @param {Function} name The name of the new class. Used to defined the NAME property for the new class.
* @param {Function} main The main class on which to base the built class
* @param {Function[]} extensions The set of extension classes which will be
* augmented/aggregated to the built class.
* @param {Object} cfg Optional. Build configuration for the class (see description).
* @return {Function} A custom class, created from the provided main and extension classes
*/
Base.build = function(name, main, extensions, cfg) {
return build(name, main, extensions, null, null, cfg);
};
/**
* <p>Creates a new class (constructor function) which extends the base class passed in as the second argument,
* and mixes in the array of extensions provided.</p>
* <p>Prototype properties or methods can be added to the new class, using the px argument (similar to Y.extend).</p>
* <p>Static properties or methods can be added to the new class, using the sx argument (similar to Y.extend).</p>
* <p>
*
* </p>
* @method Base.create
* @static
* @param {Function} name The name of the newly created class. Used to defined the NAME property for the new class.
* @param {Function} main The base class which the new class should extend. This class needs to be Base or a class derived from base (e.g. Widget).
* @param {Function[]} extensions The list of extensions which will be mixed into the built class.
* @param {Object} px The set of prototype properties/methods to add to the built class.
* @param {Object} sx The set of static properties/methods to add to the built class.
* @return {Function} The newly created class.
*/
Base.create = function(name, base, extensions, px, sx) {
return build(name, base, extensions, px, sx);
};
/**
* <p>Mixes in a list of extensions to an existing class.</p>
* @method Base.mix
* @static
* @param {Function} main The existing class into which the extensions should be mixed. The class needs to be Base or class derived from base (e.g. Widget)
* @param {Function[]} extensions The set of extension classes which will mixed into the existing main class.
* @return {Function} The modified main class, with extensions mixed in.
*/
Base.mix = function(main, extensions) {
return build(null, main, extensions, null, null, {dynamic:false});
};
/**
* The build configuration for the Base class.
*
* Defines the static fields which need to be aggregated
* when the Base class is used as the main class passed to
* the <a href="#method_Base.build">Base.build</a> method.
*
* @property Base._buildCfg
* @type Object
* @static
* @final
* @private
*/
Base._buildCfg = {
custom : {
ATTRS : function(prop, r, s) {
r[prop] = r[prop] || {};
if (s[prop]) {
Y.aggregate(r[prop], s[prop], true);
}
}
},
aggregates : ["_PLUG", "_UNPLUG"]
};