cel 0.13.0

A parser and interpreter for the Common Expression Language (CEL)
Documentation 
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use crate::common::traits;
use crate::common::types::Type;
use crate::common::value::Val;
use crate::Value;
use std::borrow::Cow;
use std::ops::Deref;
use traits::{Adder, Comparer};

#[derive(Clone, Debug, Default, PartialEq)]
pub struct Bytes(Vec<u8>);

impl Bytes {
    pub fn into_inner(self) -> Vec<u8> {
        self.0
    }

    pub fn inner(&self) -> &[u8] {
        &self.0
    }
}

impl Deref for Bytes {
    type Target = [u8];

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

impl Val for Bytes {
    fn get_type(&self) -> Type<'_> {
        super::BYTES_TYPE
    }

    fn as_adder(&self) -> Option<&dyn Adder> {
        Some(self)
    }

    fn as_comparer(&self) -> Option<&dyn Comparer> {
        Some(self)
    }

    fn equals(&self, other: &dyn Val) -> bool {
        other
            .downcast_ref::<Self>()
            .is_some_and(|a| self.0.eq(&a.0))
    }

    fn clone_as_boxed(&self) -> Box<dyn Val> {
        Box::new(Bytes(self.0.clone()))
    }
}

impl Adder for Bytes {
    fn add<'a>(&'a self, other: &dyn Val) -> Result<Cow<'a, dyn Val>, crate::ExecutionError> {
        if let Some(bytes) = other.downcast_ref::<Bytes>() {
            Ok(Cow::<dyn Val>::Owned(Box::new(Bytes(
                self.0.clone().into_iter().chain(bytes.0.clone()).collect(),
            ))))
        } else {
            Err(crate::ExecutionError::UnsupportedBinaryOperator(
                "add",
                (self as &dyn Val).try_into().unwrap_or(Value::Null),
                other.try_into().unwrap_or(Value::Null),
            ))
        }
    }
}

impl Comparer for Bytes {
    fn compare(&self, other: &dyn Val) -> Result<std::cmp::Ordering, crate::ExecutionError> {
        if let Some(bytes) = other.downcast_ref::<Bytes>() {
            Ok(self.0.cmp(&bytes.0))
        } else {
            Err(crate::ExecutionError::NoSuchOverload)
        }
    }
}

impl From<Vec<u8>> for Bytes {
    fn from(value: Vec<u8>) -> Self {
        Bytes(value)
    }
}

impl From<Bytes> for Vec<u8> {
    fn from(value: Bytes) -> Self {
        value.0
    }
}

impl TryFrom<Box<dyn Val>> for Vec<u8> {
    type Error = Box<dyn Val>;

    fn try_from(value: Box<dyn Val>) -> Result<Self, Self::Error> {
        super::cast_boxed::<Bytes>(value).map(|b| b.into_inner())
    }
}

impl<'a> TryFrom<&'a dyn Val> for &'a [u8] {
    type Error = &'a dyn Val;

    fn try_from(value: &'a dyn Val) -> Result<Self, Self::Error> {
        if let Some(bytes) = value.downcast_ref::<Bytes>() {
            return Ok(bytes.inner());
        }
        Err(value)
    }
}