camel-api 0.39.0

Core traits and interfaces for rust-camel
Documentation 
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/// Value type alias for dynamic header/property values.
pub type Value = serde_json::Value;

/// Headers type alias.
pub type Headers = std::collections::HashMap<String, Value>;

/// Total order over two `serde_json::Value`s.
///
/// Tier: Null < Bool < Number < String < Array < Object.
/// NaN sorts AFTER all real numbers (NaN-last), consistent with
/// `camel_processor::sort::SortKey`.
///
/// Shared by batch/stream resequencing policies (I3).
pub fn cmp_values(a: &Value, b: &Value) -> std::cmp::Ordering {
    use serde_json::Value as J;
    match (a, b) {
        (J::Null, J::Null) => std::cmp::Ordering::Equal,
        (J::Null, _) => std::cmp::Ordering::Less,
        (_, J::Null) => std::cmp::Ordering::Greater,
        (J::Bool(va), J::Bool(vb)) => va.cmp(vb),
        (J::Bool(_), _) => std::cmp::Ordering::Less,
        (_, J::Bool(_)) => std::cmp::Ordering::Greater,
        (J::Number(va), J::Number(vb)) => {
            let af = va.as_f64().unwrap_or(f64::NAN);
            let bf = vb.as_f64().unwrap_or(f64::NAN);
            // NaN-last: NaN > all real numbers; NaN == NaN
            af.partial_cmp(&bf)
                .unwrap_or_else(|| af.is_nan().cmp(&bf.is_nan()))
        }
        (J::Number(_), _) => std::cmp::Ordering::Less,
        (_, J::Number(_)) => std::cmp::Ordering::Greater,
        (J::String(sa), J::String(sb)) => sa.cmp(sb),
        (J::Array(va), J::Array(vb)) => serde_json::to_string(va)
            .unwrap_or_default()
            .cmp(&serde_json::to_string(vb).unwrap_or_default()),
        (J::Object(va), J::Object(vb)) => serde_json::to_string(va)
            .unwrap_or_default()
            .cmp(&serde_json::to_string(vb).unwrap_or_default()),
        (J::Array(_), _) => std::cmp::Ordering::Less,
        (_, J::Array(_)) => std::cmp::Ordering::Greater,
        (J::Object(_), _) => std::cmp::Ordering::Less,
        (_, J::Object(_)) => std::cmp::Ordering::Greater,
    }
}

/// Returns a human-readable name for the JSON value variant.
///
/// Used by error messages that report the received value type without
/// including value content. The catch-all keeps the match robust if
/// `serde_json` ever grows variants and preserves the `other` output.
#[allow(unreachable_patterns)]
pub fn value_type_name(v: &Value) -> &'static str {
    match v {
        Value::String(_) => "string",
        Value::Array(_) => "array",
        Value::Number(_) => "number",
        Value::Bool(_) => "boolean",
        Value::Object(_) => "object",
        Value::Null => "null",
        _ => "other",
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_value_type_name_variants() {
        assert_eq!(value_type_name(&Value::String("x".into())), "string");
        assert_eq!(value_type_name(&Value::Array(Vec::new())), "array");
        assert_eq!(
            value_type_name(&Value::Number(serde_json::Number::from(1))),
            "number"
        );
        assert_eq!(value_type_name(&Value::Bool(true)), "boolean");
        assert_eq!(
            value_type_name(&Value::Object(serde_json::Map::new())),
            "object"
        );
        assert_eq!(value_type_name(&Value::Null), "null");
    }
}