#[cfg(feature = "no-std")]
use alloc::{
format,
string::{String, ToString},
};
#[derive(Debug)]
pub enum Error {
ParseError,
InvalidList,
InvalidRoot,
MissingSeed,
UnknownFunction(String),
InvalidArgument(String),
InvalidDefinition(String),
InvalidCondition,
InvalidMatch,
MatchNotFound,
NotIterable,
NegativeFactorial,
OutOfBounds,
NotFound,
PngError(png::EncodingError),
#[cfg(feature = "std")]
FileError(std::io::Error),
}
impl ToString for Error {
fn to_string(&self) -> String {
match self {
Error::ParseError => "Could not parse file.".into(),
Error::InvalidList => "Type mismatch in list.".into(),
Error::InvalidRoot => "The `root` function must return a shape.".into(),
Error::MissingSeed => "Seed required for rng.".into(),
Error::UnknownFunction(name) => format!("Unknown function `{}`.", name),
Error::InvalidArgument(name) => {
format!("Invalid argument passed to `{}` function.", name)
}
Error::InvalidDefinition(name) => {
format!("Incorrect parameters in `{}` function.", name)
}
Error::InvalidCondition => "If condition must reduce to a boolean.".into(),
Error::InvalidMatch => "Incorrect type comparison in match statement.".into(),
Error::MatchNotFound => "Not all possibilities covered in match statement".into(),
Error::NotIterable => "Value is not iterable.".into(),
Error::NegativeFactorial => "Cannot get factorial of negative number.".into(),
Error::OutOfBounds => "Index out of bounds.".into(),
Error::NotFound => "Value not found.".into(),
Error::PngError(e) => e.to_string(),
#[cfg(feature = "std")]
Error::FileError(e) => e.to_string(),
}
}
}
pub type Result<T> = core::result::Result<T, Error>;