Destroy JSON with irregular content

I have an example below where 2 "unusual" things can happen:

• if status NOK
  
  , item data
  
  won't be included at all
• some element attributes list
  
  may be missing internally (in the example below, key2
  
  missing in the second element list
  
  .

Is there a way to de-serialize an invalid JSON string using automatic output? What's the easiest / best way to deal with this irregular JSON in Rust? Can I avoid writing very complex based code match

to test all possible combinations?

extern crate serialize;

static JSON: &'static str  = r#"
    {
        "status": {
            "status": "OK"
        },
        "data": {
            "container": {
                "key": "value",
                "list": [
                    {
                        "key1": "value1",
                        "key2": "value2"
                    },
                    {
                        "key1": "value1"
                    }
                ]
            }
        }
    }"#;
#[deriving(Decodable, Show)]
struct Top {
    status: Status,
    data: Data,
}

#[deriving(Decodable, Show)]
struct Data {
    container: Container,
}

#[deriving(Decodable, Show)]
struct Status {
    status: String,
}

#[deriving(Decodable, Show)]
struct Container {
    key: String,
    list: Vec<KeyVals>,
}

#[deriving(Decodable, Show)]
struct KeyVals {
    key1: String,
    key2: String,
}

fn main() {
    let result: Top = match serialize::json::decode(JSON) {
        Ok(x) => x,
        Err(why) => fail!("Failed decoding the JSON! Reason: {}", why),
    };
    println!("{}", result);
}

      

        
        
        
      

    

When running the code, it fails because the attribute is missing in the second list item key2

.

task '<main>' failed at 'Failed decoding the JSON! Reason: MissingFieldError(key2)', hello.rs:56

      

        
        
        
      

    

thank