Parse json within a script

[Mathieu-Lala]

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[schungx]

Thanks for the PR!

[Mathieu-Lala]

I managed to make the CI pass, with one basic test of the parse_json function and two error case:

• a json array under no_index
• a call to parse_json under no_object

Let me know if something is missing to this PR 👍

[schungx]

How about using serde_json under metadata? Since metadata pulls it in, it can use serde_json directly...

So gate that also under #[cfg(not(feature = "metadata"))], and put in another implementation using serde_json under metadata?

[schungx]

Looking at it, the two can probably be merged into a single function:

    #[cfg(not(feature = "no_object"))]
    #[rhai_fn(return_raw)]
    pub fn parse_json(ctx: NativeCallContext, json: &str) -> RhaiResultOf<crate::Map> {
        #[cfg(feature = "metadata")]
        return serde_json::from_str(json).map_err(|err| err.to_string().into());
        #[cfg(not(feature = "metadata"))]
        return ctx.engine().parse_json(json, true);
    }

Also, under no_index the error messages are different, so I think that's why some tests fail.

[Mathieu-Lala]

I made a mistake, i should had rename the parmeter _ctx for ctx in the parse_json