determs 0.1.0

Deterministic replay & proof engine for verifiable automated decisions — capture, verify, and replay records anyone can check. AI agents are the first profile.
Documentation 
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use std::collections::BTreeMap;

/// Structured data model used by manifests, inputs, outputs and receipts.
#[derive(Clone, Debug, PartialEq)]
pub enum Value {
    Null,
    Bool(bool),
    Number(f64),
    String(String),
    Array(Vec<Value>),
    Object(BTreeMap<String, Value>),
}

impl Value {
    pub fn kind(&self) -> &'static str {
        match self {
            Value::Null => "null",
            Value::Bool(_) => "boolean",
            Value::Number(_) => "number",
            Value::String(_) => "string",
            Value::Array(_) => "array",
            Value::Object(_) => "object",
        }
    }

    pub fn as_bool(&self) -> Option<bool> {
        match self {
            Value::Bool(value) => Some(*value),
            _ => None,
        }
    }

    pub fn as_f64(&self) -> Option<f64> {
        match self {
            Value::Number(value) => Some(*value),
            _ => None,
        }
    }

    pub fn as_str(&self) -> Option<&str> {
        match self {
            Value::String(value) => Some(value.as_str()),
            _ => None,
        }
    }

    pub fn as_array(&self) -> Option<&[Value]> {
        match self {
            Value::Array(values) => Some(values.as_slice()),
            _ => None,
        }
    }

    pub fn as_object(&self) -> Option<&BTreeMap<String, Value>> {
        match self {
            Value::Object(values) => Some(values),
            _ => None,
        }
    }

    pub fn get(&self, key: &str) -> Option<&Value> {
        self.as_object()?.get(key)
    }

    pub fn string(value: impl Into<String>) -> Self {
        Value::String(value.into())
    }

    pub fn array(values: Vec<Value>) -> Self {
        Value::Array(values)
    }

    pub fn object(entries: Vec<(impl Into<String>, Value)>) -> Self {
        let mut map = BTreeMap::new();
        for (key, value) in entries {
            map.insert(key.into(), value);
        }
        Value::Object(map)
    }
}

impl From<bool> for Value {
    fn from(value: bool) -> Self {
        Value::Bool(value)
    }
}

impl From<f64> for Value {
    fn from(value: f64) -> Self {
        Value::Number(value)
    }
}

impl From<i64> for Value {
    fn from(value: i64) -> Self {
        Value::Number(value as f64)
    }
}

impl From<usize> for Value {
    fn from(value: usize) -> Self {
        Value::Number(value as f64)
    }
}

impl From<String> for Value {
    fn from(value: String) -> Self {
        Value::String(value)
    }
}

impl From<&str> for Value {
    fn from(value: &str) -> Self {
        Value::String(value.to_string())
    }
}

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

    #[test]
    fn test_value_kind() {
        assert_eq!(Value::Null.kind(), "null");
        assert_eq!(Value::Bool(true).kind(), "boolean");
        assert_eq!(Value::Number(1.0).kind(), "number");
    }

    #[test]
    fn test_object_access() {
        let value = Value::object(vec![
            ("name", Value::from("determs")),
            ("version", Value::from(1usize)),
        ]);

        assert_eq!(value.get("name").and_then(Value::as_str), Some("determs"));
        assert_eq!(value.get("version").and_then(Value::as_f64), Some(1.0));
    }
}