configcat 0.1.5

ConfigCat Rust SDK
Documentation 
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use serde::{Deserialize, Serialize};
use std::fmt::{Display, Formatter};

/// Represents the value of a feature flag or setting.
///
/// # Examples
///
/// ```rust
/// use configcat::Value;
///
/// let bool_val = Value::Bool(true);
/// let int_val = Value::Int(42);
/// ```
#[derive(PartialEq, Debug, Clone, Serialize, Deserialize)]
#[serde(untagged)]
pub enum Value {
    /// A bool feature flag's value.
    Bool(bool),
    /// A whole number setting's value.
    Int(i64),
    /// A decimal number setting's value.
    Float(f64),
    /// A text setting's value.
    String(String),
}

impl Value {
    /// Reads the value as `bool`. Returns [`None`] if it's not a [`Value::Bool`].
    ///
    /// # Examples
    ///
    /// ```rust
    /// use configcat::Value;
    ///
    /// let value = Value::Bool(true);
    /// assert!(value.as_bool().unwrap());
    /// ```
    pub fn as_bool(&self) -> Option<bool> {
        if let Value::Bool(val) = self {
            return Some(*val);
        }
        None
    }

    /// Reads the value as `i64`. Returns [`None`] if it's not a [`Value::Int`].
    ///
    /// # Examples
    ///
    /// ```rust
    /// use configcat::Value;
    ///
    /// let value = Value::Int(42);
    /// assert_eq!(value.as_int().unwrap(), 42);
    /// ```
    pub fn as_int(&self) -> Option<i64> {
        if let Value::Int(val) = self {
            return Some(*val);
        }
        None
    }

    /// Reads the value as `f64`. Returns [`None`] if it's not a [`Value::Float`].
    ///
    /// # Examples
    ///
    /// ```rust
    /// use configcat::Value;
    ///
    /// let value = Value::Float(3.14);
    /// assert_eq!(value.as_float().unwrap(), 3.14);
    /// ```
    pub fn as_float(&self) -> Option<f64> {
        if let Value::Float(val) = self {
            return Some(*val);
        }
        None
    }

    /// Reads the value as [`String`]. Returns [`None`] if it's not a [`Value::String`].
    ///
    /// # Examples
    ///
    /// ```rust
    /// use configcat::Value;
    ///
    /// let value = Value::String("foo".to_owned());
    /// assert_eq!(value.as_str().unwrap(), "foo".to_owned());
    /// ```
    pub fn as_str(&self) -> Option<String> {
        if let Value::String(val) = self {
            return Some(val.clone());
        }
        None
    }
}

impl Display for Value {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            Value::Bool(val) => write!(f, "{val}"),
            Value::Int(val) => write!(f, "{val}"),
            Value::Float(val) => write!(f, "{val}"),
            Value::String(val) => f.write_str(val),
        }
    }
}

pub trait OptionalValueDisplay {
    fn to_str(&self) -> String;
}

impl OptionalValueDisplay for Option<&Value> {
    fn to_str(&self) -> String {
        match self {
            None => "none".to_owned(),
            Some(value) => format!("{value}"),
        }
    }
}

/// Represents a primitive type that can describe the value of a feature flag or setting.
pub trait ValuePrimitive: Into<Value> {
    /// Reads the primitive value from a [`Value`].
    fn from_value(value: &Value) -> Option<Self>;
}

macro_rules! primitive_impl {
    ($ob:ident $to:ident $as_m:ident $t:ty) => (
        from_val_to_enum!($ob $to $t);

        impl ValuePrimitive for $t {
            fn from_value(value: &Value) -> Option<Self> {
                value.$as_m()
            }
        }
    )
}

primitive_impl!(Value String as_str String);
primitive_impl!(Value Float as_float f64);
primitive_impl!(Value Int as_int i64);
primitive_impl!(Value Bool as_bool bool);
from_val_to_enum_into!(Value String &str);