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📄 base-build-debug.js(14.91 KB)
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📄 base-build.js(14.91 KB)

Editing: base-build.js

YUI.add('base-build', function (Y, NAME) {

/**
     * 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 BaseCore = Y.BaseCore,
        Base     = Y.Base,
        L        = Y.Lang,

INITIALIZER = "initializer",
        DESTRUCTOR  = "destructor",
        AGGREGATES  = ["_PLUG", "_UNPLUG"],

build;

// Utility function used in `_buildCfg` to aggregate array values into a new
    // array from the sender constructor to the receiver constructor.
    function arrayAggregator(prop, r, s) {
        if (s[prop]) {
            r[prop] = (r[prop] || []).concat(s[prop]);
        }
    }

// Utility function used in `_buildCfg` to aggregate `_ATTR_CFG` array
    // values from the sender constructor into a new array on receiver's
    // constructor, and clear the cached hash.
    function attrCfgAggregator(prop, r, s) {
        if (s._ATTR_CFG) {
            // Clear cached hash.
            r._ATTR_CFG_HASH = null;

arrayAggregator.apply(null, arguments);
        }
    }

// Utility function used in `_buildCfg` to aggregate ATTRS configs from one
    // the sender constructor to the receiver constructor.
    function attrsAggregator(prop, r, s) {
        BaseCore.modifyAttrs(r, s.ATTRS);
    }

Base._build = function(name, main, extensions, px, sx, cfg) {

var build = Base._build,

builtClass = build._ctor(main, cfg),
            buildCfg = build._cfg(main, cfg, extensions),

_mixCust = build._mixCust,

dynamic = builtClass._yuibuild.dynamic,

i, l, extClass, extProto,
            initializer,
            destructor;

// Augment/Aggregate
 for (i = 0, l = extensions.length; i < l; i++) {
 extClass = extensions[i];

extProto = extClass.prototype;

initializer = extProto[INITIALIZER];
            destructor = extProto[DESTRUCTOR];
            delete extProto[INITIALIZER];
            delete extProto[DESTRUCTOR];

// Prototype, old non-displacing augment
            Y.mix(builtClass, extClass, true, null, 1);

// Custom Statics
            _mixCust(builtClass, extClass, buildCfg);

if (initializer) {
                extProto[INITIALIZER] = initializer;
            }

if (destructor) {
                extProto[DESTRUCTOR] = destructor;
            }

builtClass._yuibuild.exts.push(extClass);
        }

if (px) {
            Y.mix(builtClass.prototype, px, true);
        }

if (sx) {
            Y.mix(builtClass, build._clean(sx, buildCfg), true);
            _mixCust(builtClass, sx, buildCfg);
        }

builtClass.prototype.hasImpl = build._impl;

if (dynamic) {
            builtClass.NAME = name;
            builtClass.prototype.constructor = builtClass;

// Carry along the reference to `modifyAttrs()` from `main`.
            builtClass.modifyAttrs = main.modifyAttrs;
        }

return builtClass;
    };

build = Base._build;

Y.mix(build, {

_mixCust: function(r, s, cfg) {

var aggregates,
                custom,
                statics,
                aggr,
                l,
                i;

if (cfg) {
                aggregates = cfg.aggregates;
                custom = cfg.custom;
                statics = cfg.statics;
            }

if (statics) {
                Y.mix(r, s, true, statics);
            }

if (aggregates) {
 for (i = 0, l = aggregates.length; i < l; i++) {
 aggr = aggregates[i];
 if (!r.hasOwnProperty(aggr) && s.hasOwnProperty(aggr)) {
 r[aggr] = L.isArray(s[aggr]) ? [] : {};
 }
 Y.aggregate(r, s, true, [aggr]);
 }
 }

if (custom) {
                for (i in custom) {
                    if (custom.hasOwnProperty(i)) {
                        custom[i](i, 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,
               buildCfg = builtClass._yuibuild;

if (!buildCfg) {
                buildCfg = builtClass._yuibuild = {};
            }

buildCfg.id = buildCfg.id || null;
            buildCfg.exts = buildCfg.exts || [];
            buildCfg.dynamic = dynamic;

return builtClass;
        },

_cfg : function(main, cfg, exts) {
            var aggr = [],
                cust = {},
                statics = [],
                buildCfg,
                cfgAggr = (cfg && cfg.aggregates),
                cfgCustBuild = (cfg && cfg.custom),
                cfgStatics = (cfg && cfg.statics),
                c = main,
                i,
                l;

// Prototype Chain
            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);
                    }
                    if (buildCfg.statics) {
                        statics = statics.concat(buildCfg.statics);
                    }
                }
                c = c.superclass ? c.superclass.constructor : null;
            }

// Exts
 if (exts) {
 for (i = 0, l = exts.length; i < l; i++) {
 c = exts[i];
 buildCfg = c._buildCfg;
 if (buildCfg) {
 if (buildCfg.aggregates) {
 aggr = aggr.concat(buildCfg.aggregates);
 }
 if (buildCfg.custom) {
 Y.mix(cust, buildCfg.custom, true);
 }
 if (buildCfg.statics) {
 statics = statics.concat(buildCfg.statics);
 }
 }
 }
 }

if (cfgAggr) {
                aggr = aggr.concat(cfgAggr);
            }

if (cfgCustBuild) {
                Y.mix(cust, cfg.cfgBuild, true);
            }

if (cfgStatics) {
                statics = statics.concat(cfgStatics);
            }

return {
                aggregates: aggr,
                custom: cust,
                statics: statics
            };
        },

_clean : function(sx, cfg) {
            var prop, i, l, sxclone = Y.merge(sx),
                aggregates = cfg.aggregates,
                custom = cfg.custom;

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;
        }
    });

/**
 * 
 * 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.
 * 
 * 
 * The cfg object supports the following properties
 * 
 * <dl>
 * <dt>dynamic &#60;boolean&#62;</dt>
 * <dd>
 * 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.
 * If false, the extensions classes are augmented directly to
 * the main class, modifying the main class' prototype.
 * </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 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 define 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);
 };

/**
     * 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.
     *
     * Prototype properties or methods can be added to the new class, using the px argument (similar to Y.extend).
     *
     * Static properties or methods can be added to the new class, using the sx argument (similar to Y.extend).
     *
     * **NOTE FOR COMPONENT DEVELOPERS**: Both the `base` class, and `extensions` can define static a `_buildCfg`
     * property, which acts as class creation meta-data, and drives how special static properties from the base
     * class, or extensions should be copied, aggregated or (custom) mixed into the newly created class.
     *
     * The `_buildCfg` property is a hash with 3 supported properties: `statics`, `aggregates` and `custom`, e.g:
     *
     *     // If the Base/Main class is the thing introducing the property:
     *
     *     MyBaseClass._buildCfg = {
     *
     *        // Static properties/methods to copy (Alias) to the built class.
     *        statics: ["CopyThisMethod", "CopyThisProperty"],
     *
     *        // Static props to aggregate onto the built class.
     *        aggregates: ["AggregateThisProperty"],
     *
     *        // Static properties which need custom handling (e.g. deep merge etc.)
     *        custom: {
     *           "CustomProperty" : function(property, Receiver, Supplier) {
     *              ...
     *              var triggers = Receiver.CustomProperty.triggers;
     *              Receiver.CustomProperty.triggers = triggers.concat(Supplier.CustomProperty.triggers);
     *              ...
     *           }
     *        }
     *     };
     *
     *     MyBaseClass.CopyThisMethod = function() {...};
     *     MyBaseClass.CopyThisProperty = "foo";
     *     MyBaseClass.AggregateThisProperty = {...};
     *     MyBaseClass.CustomProperty = {
     *        triggers: [...]
     *     }
     *
     *     // Or, if the Extension is the thing introducing the property:
     *
     *     MyExtension._buildCfg = {
     *         statics : ...
     *         aggregates : ...
     *         custom : ...
     *     }
     *
     * This way, when users pass your base or extension class to `Y.Base.create` or `Y.Base.mix`, they don't need to
     * know which properties need special handling. `Y.Base` has a buildCfg which defines `ATTRS` for custom mix handling
     * (to protect the static config objects), and `Y.Widget` has a buildCfg which specifies `HTML_PARSER` for
     * straight up aggregation.
     *
     * @method create
     * @static
     * @param {String} name The name of the newly created class. Used to define 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);
    };

/**
 * Mixes in a list of extensions to an existing class.
 * @method mix
 * @static
 * @param {Function} main The existing class into which the extensions should be mixed.
 * The class needs to be Base or a 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) {

if (main._CACHED_CLASS_DATA) {
            main._CACHED_CLASS_DATA = null;
        }

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 _buildCfg
 * @type Object
 * @static
 * @final
 * @private
 */
 BaseCore._buildCfg = {
 aggregates: AGGREGATES.concat(),

custom: {
            ATTRS         : attrsAggregator,
            _ATTR_CFG     : attrCfgAggregator,
            _NON_ATTRS_CFG: arrayAggregator
        }
    };

// Makes sure Base and BaseCore use separate `_buildCfg` objects.
    Base._buildCfg = {
        aggregates: AGGREGATES.concat(),

custom: {
            ATTRS         : attrsAggregator,
            _ATTR_CFG     : attrCfgAggregator,
            _NON_ATTRS_CFG: arrayAggregator
        }
    };

}, '3.18.1', {"requires": ["base-base"]});

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