stak-code 0.2.69

Bytecode encoding/decoding for Stak Scheme
Documentation 
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use alloc::string::FromUtf8Error;
use core::{
    error,
    fmt::{self, Display, Formatter},
};

/// An error of encoding and decoding bytecodes.
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Error {
    /// An unexpected end of input.
    EndOfInput,
    /// An illegal instruction.
    IllegalInstruction,
    /// A closure missing its body.
    MissingClosureBody,
    /// A missing integer.
    MissingInteger,
    /// A missing operand.
    MissingOperand,
    /// A missing `else` branch.
    MissingElseBranch,
    /// An invalid UTF-8 string.
    Utf8(FromUtf8Error),
}

impl From<FromUtf8Error> for Error {
    fn from(error: FromUtf8Error) -> Self {
        Self::Utf8(error)
    }
}

impl error::Error for Error {}

impl Display for Error {
    fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
        match self {
            Self::EndOfInput => write!(formatter, "unexpected end of input"),
            Self::IllegalInstruction => write!(formatter, "illegal instruction"),
            Self::MissingClosureBody => write!(formatter, "missing closure body"),
            Self::MissingInteger => write!(formatter, "missing integer"),
            Self::MissingOperand => write!(formatter, "missing operand"),
            Self::MissingElseBranch => write!(formatter, "missing else branch"),
            Self::Utf8(error) => write!(formatter, "{error}"),
        }
    }
}