femstache 0.1.2

Embrace the feminine mustache to unlock your templating dreams! Or something, I don't know. :3
Documentation 
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use core::fmt;
use std::error::Error as StdError;

use femstache_parser::nodes::Ident;

pub use femstache_parser::{ParseError, ParseResult};

use crate::loader::LoaderError;

#[derive(Debug)]
pub enum EvalError {
    // TODO: attach span
    InvalidType,
    VariableNotFound(Ident),
    Loader(LoaderError),
}

impl StdError for EvalError {
    fn source(&self) -> Option<&(dyn StdError + 'static)> {
        match self {
            EvalError::Loader(inner) => Some(inner),
            _ => None,
        }
    }
}

impl fmt::Display for EvalError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            EvalError::InvalidType => write!(f, "invalid type"),
            EvalError::VariableNotFound(ident) => write!(f, "variable {} not found", ident.data),
            EvalError::Loader(inner) => write!(f, "loader error: {inner}"),
        }
    }
}

impl From<LoaderError> for EvalError {
    fn from(err: LoaderError) -> Self {
        Self::Loader(err)
    }
}

pub type EvalResult<T> = core::result::Result<T, EvalError>;