source: Dev/trunk/src/client/dojox/app/utils/config.js

define(["dojo/sniff"], function(has){

// module:
//              dojox/app/utils/config

return {
        // summary:
        //              This module contains the config

        configProcessHas: function(/*Object*/ source){
                // summary:
                //              scan the source config for has checks and call configMerge to merge has sections, and remove the has sections from the source.
                // description:
                //              configProcessHas will scan the source config for has checks. 
                //              For each has section the items inside the has section will be tested with has (sniff)
                //              If the has test is true it will call configMerge to merge has sections back into the source config.
                //              It will always remove the has section from the source after processing it.
                //              The names in the has section can be separated by a comma, indicating that any of those being true will satisfy the test.
                // source:
                //              an object representing the config to be processed.
                // returns:
                //              the updated source object.
                for(var name in source){
                        var     sval = source[name];
                        if(name == "has"){ // found a "has" section in source
                                for(var hasname in sval){ // get the hasnames from the has section
                                        if(!(hasname.charAt(0) == '_' && hasname.charAt(1) == '_') && sval && typeof sval === 'object'){
                                                // need to handle multiple has checks separated by a ",".
                                                var parts = hasname.split(',');
                                                if(parts.length > 0){
                                                        while(parts.length > 0){        
                                                                var haspart = parts.shift();
                                                                // check for has(haspart) or if haspart starts with ! check for !(has(haspart))
                                                                if((has(haspart)) || (haspart.charAt(0) == '!' && !(has(haspart.substring(1))))){ // if true this one should be merged
                                                                        var hasval = sval[hasname];
                                                                        this.configMerge(source, hasval); // merge this has section into the source config
                                                                        break;  // found a match for this multiple has test, so go to the next one
                                                                }
                                                        }
                                                }
                                        }
                                }
                                delete source["has"];   // after merge remove this has section from the config
                        }else{
                                if(!(name.charAt(0) == '_' && name.charAt(1) == '_') && sval && typeof sval === 'object'){
                                                this.configProcessHas(sval);
                                }
                        }
                }
                return source;
        },

        configMerge: function(/*Object*/ target, /*Object*/ source){
                // summary:
                //              does a deep copy of the source into the target to merge the config from the source into the target
                // description:
                //              configMerge will merge the source config into the target config with a deep copy.
                //              anything starting with __ will be skipped and if the target is an array the source items will be pushed into the target.
                // target:
                //              an object representing the config which will be updated by merging in the source.
                // source:
                //              an object representing the config to be merged into the target.
                // returns:
                //              the updated target object.

                for(var name in source){
                        var tval = target[name];
                        var     sval = source[name];
                        if(tval !== sval && !(name.charAt(0) == '_' && name.charAt(1) == '_')){
                                if(tval && typeof tval === 'object' && sval && typeof sval === 'object'){
                                        this.configMerge(tval, sval);
                                }else{
                                        if(target instanceof Array){
                                                target.push(sval);
                                        }else{
                                                target[name] = sval;
                                        }
                                }
                        }
                }
                return target;
        }
};

});