source: Dev/trunk/src/client/dojox/lang/tests/declare-old.js

dojo.provide("dojox.lang.tests.declare-old");

// the old file copied and modified here for testing

// this file courtesy of the TurboAjax Group, licensed under a Dojo CLA

dojox.lang.tests.declareOld = function(/*String*/ className, /*Function|Function[]*/ superclass, /*Object*/ props){
        // summary:
        //              Create a feature-rich constructor from compact notation
        //
        // description:
        //              Create a feature-rich constructor from compact notation
        //
        // className:
        //              The name of the constructor (loosely, a "class")
        //              stored in the "declaredClass" property in the created prototype
        // superclass:
        //              May be null, a Function, or an Array of Functions. If an array,
        //              the first element is used as the prototypical ancestor and
        //              any following Functions become mixin ancestors.
        // props:
        //              An object whose properties are copied to the
        //              created prototype.
        //              Add an instance-initialization function by making it a property
        //              named "constructor".
        // description:
        //              Create a constructor using a compact notation for inheritance and
        //              prototype extension.
        //
        //              All superclasses (including mixins) must be Functions (not simple Objects).
        //
        //              Mixin ancestors provide a type of multiple inheritance. Prototypes of mixin
        //              ancestors are copied to the new class: changes to mixin prototypes will
        //              not affect classes to which they have been mixed in.
        //
        //              "className" is cached in "declaredClass" property of the new class.
        //
        // example:
        //              Declare a class with no ancestors.
        //      |       dojo.declare("my.ClassyThing", null, {
        //      |               aProperty:"string",
        //      |               constructor: function(args){
        //      |                       dojo.mixin(this, args);
        //      |               }
        //      |       });
        //
        // example:
        //              Declare a class inheriting from my.classed.Foo
        //      |       dojo.declare("my.classes.Bar", my.classes.Foo, {
        //      |               // properties to be added to the class prototype
        //      |               someValue: 2,
        //      |               // initialization function
        //      |               constructor: function(){
        //      |                       this.myComplicatedObject = new ReallyComplicatedObject();
        //      |               },
        //      |               // other functions
        //      |               someMethod: function(){
        //      |                       doStuff();
        //      |               }
        //      |       );
        //
        // example:
        //              Declare a class inherting from two mixins, handling multiple constructor args
        //      |       dojo.declare("my.ComplexMix", [my.BaseClass, my.MixedClass],{
        //      |               constructor: function(a, b){
        //      |                       // someone called `new my.ComplexMix("something", "maybesomething");`
        //      |               }
        //      |       });

        // process superclass argument
        var dd = arguments.callee, mixins;
        if(dojo.isArray(superclass)){
                mixins = superclass;
                superclass = mixins.shift();
        }
        // construct intermediate classes for mixins
        if(mixins){
                dojo.forEach(mixins, function(m, i){
                        if(!m){ throw(className + ": mixin #" + i + " is null"); } // It's likely a required module is not loaded
                        superclass = dd._delegate(superclass, m);
                });
        }
        // create constructor
        var ctor = dd._delegate(superclass);
        // extend with "props"
        props = props || {};
        ctor.extend(props);
        // more prototype decoration
        dojo.extend(ctor, { declaredClass: className, _constructor: props.constructor/*, preamble: null*/ });
        // special help for IE
        ctor.prototype.constructor = ctor;
        // create named reference
        return dojo.setObject(className, ctor); // Function
};

dojo.mixin(dojox.lang.tests.declareOld, {
        _delegate: function(base, mixin){
                var bp = (base || 0).prototype, mp = (mixin || 0).prototype, dd = dojox.lang.tests.declareOld;
                // fresh constructor, fresh prototype
                var ctor = dd._makeCtor();
                // cache ancestry
                dojo.mixin(ctor, { superclass: bp, mixin: mp, extend: dd._extend });
                // chain prototypes
                if(base){ ctor.prototype = dojo._delegate(bp); }
                // add mixin and core
                dojo.extend(ctor, dd._core, mp || 0, { _constructor: null, preamble: null });
                // special help for IE
                ctor.prototype.constructor = ctor;
                // name this class for debugging
                ctor.prototype.declaredClass = (bp || 0).declaredClass + '_' + (mp || 0).declaredClass;
                return ctor;
        },
        _extend: function(props){
                var i, fn;
                for(i in props){ if(dojo.isFunction(fn=props[i]) && !0[i]){fn.nom=i;fn.ctor=this;} }
                dojo.extend(this, props);
        },
        _makeCtor: function(){
                // we have to make a function, but don't want to close over anything
                return function(){ this._construct(arguments); };
        },
        _core: {
                _construct: function(args){
                        var c = args.callee, s = c.superclass, ct = s && s.constructor,
                                m = c.mixin, mct = m && m.constructor, a = args, ii, fn;
                        // side-effect of = used on purpose here, lint may complain, don't try this at home
                        if(a[0]){
                                // FIXME: preambles for each mixin should be allowed
                                // FIXME:
                                //              should we allow the preamble here NOT to modify the
                                //              default args, but instead to act on each mixin
                                //              independently of the class instance being constructed
                                //              (for impedence matching)?

                                // allow any first argument w/ a "preamble" property to act as a
                                // class preamble (not exclusive of the prototype preamble)
                                if(/*dojo.isFunction*/((fn = a[0].preamble))){
                                        a = fn.apply(this, a) || a;
                                }
                        }
                        // prototype preamble
                        if((fn = c.prototype.preamble)){ a = fn.apply(this, a) || a; }
                        // FIXME:
                        //              need to provide an optional prototype-settable
                        //              "_explicitSuper" property which disables this
                        // initialize superclass
                        if(ct && ct.apply){ ct.apply(this, a); }
                        // initialize mixin
                        if(mct && mct.apply){ mct.apply(this, a); }
                        // initialize self
                        if((ii = c.prototype._constructor)){ ii.apply(this, args); }
                        // post construction
                        if(this.constructor.prototype == c.prototype && (ct = this.postscript)){ ct.apply(this, args); }
                },
                _findMixin: function(mixin){
                        var c = this.constructor, p, m;
                        while(c){
                                p = c.superclass;
                                m = c.mixin;
                                if(m == mixin || (m instanceof mixin.constructor)){ return p; }
                                if(m && m._findMixin && (m = m._findMixin(mixin))){ return m; }
                                c = p && p.constructor;
                        }
                },
                _findMethod: function(name, method, ptype, has){
                        // consciously trading readability for bytes and speed in this low-level method
                        var p=ptype, c, m, f;
                        do{
                                c = p.constructor;
                                m = c.mixin;
                                // find method by name in our mixin ancestor
                                if(m && (m = this._findMethod(name, method, m, has))){ return m; }
                                // if we found a named method that either exactly-is or exactly-is-not 'method'
                                if((f = p[name]) && (has == (f == method))){ return p; }
                                // ascend chain
                                p = c.superclass;
                        }while(p);
                        // if we couldn't find an ancestor in our primary chain, try a mixin chain
                        return !has && (p = this._findMixin(ptype)) && this._findMethod(name, method, p, has);
                },
                inherited: function(name, args, newArgs){
                        // summary:
                        //              Call an inherited member function of this declared class.
                        //
                        // description:
                        //              Call an inherited member function of this declared class, allowing advanced
                        //              manipulation of passed arguments to inherited functions.
                        //              Explicitly cannot handle the case of intending to pass no `newArgs`, though
                        //              hoping the use in conjuction with `dojo.hitch`. Calling an inherited
                        //              function directly via hitch() is not supported.
                        //
                        // name: String?
                        //              The name of the method to call. If omitted, the special `arguments` passed is
                        //              used to determine the inherited function. All subsequent positional arguments
                        //              are shifted left if `name` has been omitted. (eg: args becomes name)
                        //
                        // args: Object
                        //              An `arguments` object to pass along to the inherited function. Can be in the
                        //              `name` position if `name` has been omitted. This is a literal JavaScript `arguments`
                        //              object, and must be passed.
                        //
                        // newArgs: Array?
                        //              An Array of argument values to pass to the inherited function. If omitted,
                        //              the original arguments are passed (determined from the `args` variable)
                        //
                        // example:
                        //              Simply call an inherited function with the same signature.
                        //      |       this.inherited(arguments);
                        // example:
                        //              Call an inherited method, replacing the arguments passed with "replacement" and "args"
                        //      |       this.inherited(arguments, [replacement, args]);
                        // example:
                        //              Call an inherited method, passing an explicit name.
                        //      |       this.inherited("method", arguments);
                        // example:
                        //              Call an inherited method by name, replacing the arguments:
                        //      |       this.inherited("method", arguments, [replacement, args]);

                        var a = arguments;
                        // some magic crap that alters `arguments` to shift in the case of missing `name`
                        if(typeof a[0] != "string"){ // inline'd type check
                                newArgs = args;
                                args = name;
                                name = args.callee.nom;
                        }
                        a = newArgs || args; // WARNING: hitch()ed functions may pass a newArgs you aren't expecting.
                        var c = args.callee, p = this.constructor.prototype, fn, mp;
                        // if not an instance override
                        if(this[name] != c || p[name] == c){
                                // start from memoized prototype, or
                                // find a prototype that has property 'name' == 'c'
                                mp = (c.ctor || 0).superclass || this._findMethod(name, c, p, true);
                                if(!mp){ throw(this.declaredClass + ': inherited method "' + name + '" mismatch'); }
                                // find a prototype that has property 'name' != 'c'
                                p = this._findMethod(name, c, mp, false);
                        }
                        // we expect 'name' to be in prototype 'p'
                        fn = p && p[name];
                        if(!fn){ throw( mp.declaredClass + ': inherited method "' + name + '" not found'); }
                        // if the function exists, invoke it in our scope
                        return fn.apply(this, a);
                }
        }
});