shopify_function 2.1.0

Crate to write Shopify Functions in Rust.
Documentation 
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use std::fmt;
use std::ops::Deref;

/// Convenience wrapper for converting between Shopify's `Decimal` scalar, which
/// is serialized as a `String`, and Rust's `f64`.
#[derive(Debug, PartialEq, Clone, Copy)]
pub struct Decimal(pub f64);

impl Decimal {
    /// Access the value as an `f64`
    pub fn as_f64(&self) -> f64 {
        self.0
    }
}

impl fmt::Display for Decimal {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(ryu::Buffer::new().format(self.0))
    }
}

impl Deref for Decimal {
    type Target = f64;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl TryFrom<String> for Decimal {
    type Error = &'static str;

    fn try_from(value: String) -> Result<Self, Self::Error> {
        value
            .as_str()
            .parse::<f64>()
            .map(Self)
            .map_err(|_| "Error parsing decimal: invalid float literal")
    }
}

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

impl From<Decimal> for f64 {
    fn from(value: Decimal) -> Self {
        value.0
    }
}

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

impl crate::wasm_api::Deserialize for Decimal {
    fn deserialize(value: &crate::wasm_api::Value) -> Result<Self, crate::wasm_api::read::Error> {
        let string_value: String = crate::wasm_api::Deserialize::deserialize(value)?;
        Self::try_from(string_value).map_err(|_| crate::wasm_api::read::Error::InvalidType)
    }
}

impl crate::wasm_api::Serialize for Decimal {
    fn serialize(
        &self,
        context: &mut crate::wasm_api::Context,
    ) -> Result<(), crate::wasm_api::write::Error> {
        crate::wasm_api::Serialize::serialize(self.to_string().as_str(), context)
    }
}

#[cfg(test)]
mod tests {
    use super::Decimal;
    use crate::wasm_api::{Context, Deserialize, Serialize};

    #[test]
    fn test_deserialization() {
        let decimal_value = serde_json::json!("123.4");
        let context = Context::new_with_input(decimal_value);
        let value = context.input_get().expect("Error getting input");
        let decimal: Decimal = Decimal::deserialize(&value).expect("Error deserializing from JSON");
        assert_eq!(123.4, decimal.as_f64());
    }

    #[test]
    fn test_deserialization_error() {
        let decimal_value = serde_json::json!("123.4.5");
        let context = Context::new_with_input(decimal_value);
        let value = context.input_get().expect("Error getting input");
        let error = Decimal::deserialize(&value).expect_err("Expected an error");
        assert_eq!("Invalid type", error.to_string());
    }

    #[test]
    fn test_serialization() {
        let decimal = Decimal(123.4);
        let mut context = Context::new_with_input(serde_json::json!({}));
        decimal.serialize(&mut context).unwrap();
        let output = context.finalize_output_and_return().unwrap();
        assert_eq!(serde_json::json!("123.4"), output);
    }

    #[test]
    fn test_display_formatting() {
        assert_eq!(Decimal(123.45).to_string(), "123.45");
        assert_eq!(Decimal(123.0).to_string(), "123.0");
        assert_eq!(Decimal(0.0).to_string(), "0.0");
        assert_eq!(Decimal(-5.678).to_string(), "-5.678");
    }
}