vulcan/vasm/src/parse_error.rs

use std::fmt::{Display, Formatter};

use vcore::opcodes::InvalidMnemonic;

#[derive(Debug, PartialEq, Clone)]
pub enum ParseError {
    LineParseFailure,
    InvalidInstruction(String),
}

impl<'a> From<InvalidMnemonic<'a>> for ParseError {
    fn from(err: InvalidMnemonic<'a>) -> Self {
        Self::InvalidInstruction(err.0.into())
    }
}

impl Display for ParseError {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        use ParseError::*;
        match self {
            LineParseFailure => write!(f, "Failed to parse line"),
            InvalidInstruction(p) => write!(f, "Cannot parse {} as instruction", p),
        }
    }
}

#[derive(Debug, Clone, PartialEq)]
pub enum AssembleError {
    ParseError(usize, ParseError),
    EquResolveError(usize, String, EvalError),
    EquDuplicateError(usize, String),
    OrgResolveError(usize, EvalError),
    ArgError(usize, EvalError),
    NoCode,
    IncludeError(usize, String),
    MacroError(usize),
}

impl Display for AssembleError {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            AssembleError::EquResolveError(line, name, err) => {
                write!(f, "Cannot resolve .equ {} on line {}: {}", name, line, err)
            }
            AssembleError::EquDuplicateError(line, name) => {
                write!(f, "Duplicate .equ {} on line {}", name, line)
            }
            AssembleError::OrgResolveError(line, err) => {
                write!(f, "Cannot resolve .org on line {}: {}", line, err)
            }
            AssembleError::ArgError(line, err) => {
                write!(f, "Cannot calculate argument on line {}: {}", line, err)
            }
            AssembleError::NoCode => {
                write!(f, "No output would be generated by this code")
            }
            AssembleError::ParseError(line, err) => {
                write!(f, "Parse error on line {}: {}", line, err)
            }
            AssembleError::IncludeError(line, file) => {
                write!(f, "Cannot read \"{}\" on line {}", file, line)
            }
            AssembleError::MacroError(line) => {
                write!(f, "Malformed macro control structure on line {}", line)
            }
        }
    }
}

#[derive(Debug, Clone, PartialEq)]
pub enum EvalError {
    MissingLabel(String),
    UnknownAddress(usize),
    OffsetError(usize, i32),
}

impl Display for EvalError {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            EvalError::MissingLabel(label) => write!(f, "Unable to resolve label {}", label),
            EvalError::UnknownAddress(line_num) => write!(
                f,
                "Unable to calculate starting address of line {}",
                line_num
            ),
            EvalError::OffsetError(line_num, offset) => {
                write!(f, "Invalid line offset {} on line {}", offset, line_num)
            }
        }
    }
}