json parse vortex parameters
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		@@ -246,3 +246,26 @@ fn parse_err() {
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    json_to_grids(r#"{"x": "linspace:1.2:3.1:412.2", "y": [0.1, 0.2]}"#).unwrap_err();
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    json_to_grids(r#"{"x": [-2, -3, "dfd"], "y": [0.1, 0.2]}"#).unwrap_err();
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}
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pub fn json_to_vortex(mut json: JsonValue) -> super::euler::VortexParameters {
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    let x0 = json.remove("x0").as_number().unwrap().into();
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    let y0 = json.remove("y0").as_number().unwrap().into();
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    let mach = json.remove("mach").as_number().unwrap().into();
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    let rstar = json.remove("rstar").as_number().unwrap().into();
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    let eps = json.remove("eps").as_number().unwrap().into();
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    if !json.is_empty() {
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        eprintln!("Found unused items when parsing vortex");
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        for (name, val) in json.entries() {
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            eprintln!("\t{} {}", name, val.dump());
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        }
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    }
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    super::euler::VortexParameters {
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        x0,
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        y0,
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        mach,
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        rstar,
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        eps,
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    }
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}
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