XML to NSDictionary Converter

I found recently a nice lib easily converting XML to NSDictionary. The code is now on GitHub.

Here are the key ideas:

  1. XML elements map to key names in the dictionary
  2. Each element corresponds to a child dictionary
  3. Attribute key-value pairs are added to the element’s child dictionary
  4. Strings from text nodes are assigned to the child dictionary’s “text” key
  5. If an element name is encountered multiple times, the value of the element is set to an array of children dictionaries

For a more detailed presentation.

A detailed example:

The XML to parse:

//    <items>
//        <item id=”0001″ type=”donut”>
//            <name>Cake</name>
//            <ppu>0.55</ppu>
//            <batters>
//                <batter id=”1001″>Regular</batter>
//                <batter id=”1002″>Chocolate</batter>
//                <batter id=”1003″>Blueberry</batter>
//            </batters>
//            <topping id=”5001″>None</topping>
//            <topping id=”5002″>Glazed</topping>
//            <topping id=”5005″>Sugar</topping>
//        </item>
//    </items>
//

The Code:

NSString *testXMLString = @”<items><item id=\”0001\” type=\”donut\”><name>Cake</name><ppu>0.55</ppu><batters><batter id=\”1001\”>Regular</batter><batter id=\”1002\”>Chocolate</batter><batter id=\”1003\”>Blueberry</batter></batters><topping id=\”5001\”>None</topping><topping id=\”5002\”>Glazed</topping><topping id=\”5005\”>Sugar</topping></item></items>”;

// Parse the XML into a dictionary
NSError *parseError = nil;
NSDictionary *xmlDictionary = [XMLReader dictionaryForXMLString:testXMLString error:&parseError];

// Print the dictionary
NSLog(@”%@”, xmlDictionary);

The result

// xmlDictionary = {
//    items = {
//        item = {
//            id = 0001;
//            type = donut;
//            name = {
//                text = Cake;
//            };
//            ppu = {
//                text = 0.55;
//            };
//            batters = {
//                batter = (
//                    {
//                        id = 1001;
//                        text = Regular;
//                    },
//                    {
//                        id = 1002;
//                        text = Chocolate;
//                    },
//                    {
//                        id = 1003;
//                        text = Blueberry;
//                    }
//                );
//            };
//            topping = (
//                {
//                    id = 5001;
//                    text = None;
//                },
//                {
//                    id = 5002;
//                    text = Glazed;
//                },
//                {
//                    id = 5005;
//                    text = Sugar;
//                }
//            );
//        };
//     };
// }
//

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5 thoughts on “XML to NSDictionary Converter

  1. There’s a little problem when one markup is named “text”.
    XMLReader create an empty key named “text” in the dictionary.
    To solve it add this test in the “didStartElement” method :

    if([elementName isEqualToString:@”text”])
    elementName=@”textLabel”; //the new key you want instead of “text”

    PS: coucou d’Aden 😉

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