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Viewing file:     mappingHelpers.js (3.77 KB)      -rw-r--r--

(function() {
    var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)

    ko.toJS = function(rootObject) {
        if (arguments.length == 0)
            throw new Error("When calling ko.toJS, pass the object you want to convert.");

        // We just unwrap everything at every level in the object graph
        return mapJsObjectGraph(rootObject, function(valueToMap) {
            // Loop because an observable's value might in turn be another observable wrapper
            for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
                valueToMap = valueToMap();
            return valueToMap;
        });
    };

    ko.toJSON = function(rootObject, replacer, space) {     // replacer and space are optional
        var plainJavaScriptObject = ko.toJS(rootObject);
        return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
    };

    function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
        visitedObjects = visitedObjects || new objectLookup();

        rootObject = mapInputCallback(rootObject);
        var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof RegExp)) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean));
        if (!canHaveProperties)
            return rootObject;

        var outputProperties = rootObject instanceof Array ? [] : {};
        visitedObjects.save(rootObject, outputProperties);

        visitPropertiesOrArrayEntries(rootObject, function(indexer) {
            var propertyValue = mapInputCallback(rootObject[indexer]);

            switch (typeof propertyValue) {
                case "boolean":
                case "number":
                case "string":
                case "function":
                    outputProperties[indexer] = propertyValue;
                    break;
                case "object":
                case "undefined":
                    var previouslyMappedValue = visitedObjects.get(propertyValue);
                    outputProperties[indexer] = (previouslyMappedValue !== undefined)
                        ? previouslyMappedValue
                        : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
                    break;
            }
        });

        return outputProperties;
    }

    function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
        if (rootObject instanceof Array) {
            for (var i = 0; i < rootObject.length; i++)
                visitorCallback(i);

            // For arrays, also respect toJSON property for custom mappings (fixes #278)
            if (typeof rootObject['toJSON'] == 'function')
                visitorCallback('toJSON');
        } else {
            for (var propertyName in rootObject) {
                visitorCallback(propertyName);
            }
        }
    };

    function objectLookup() {
        this.keys = [];
        this.values = [];
    };

    objectLookup.prototype = {
        constructor: objectLookup,
        save: function(key, value) {
            var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
            if (existingIndex >= 0)
                this.values[existingIndex] = value;
            else {
                this.keys.push(key);
                this.values.push(value);
            }
        },
        get: function(key) {
            var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
            return (existingIndex >= 0) ? this.values[existingIndex] : undefined;
        }
    };
})();

ko.exportSymbol('toJS', ko.toJS);
ko.exportSymbol('toJSON', ko.toJSON);