forked from AbleScript/ablescript
76 lines
2.4 KiB
Rust
76 lines
2.4 KiB
Rust
use std::{fmt::Display, io, ops::Range};
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use crate::{brian::InterpretError, lexer::Token};
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#[derive(Debug)]
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pub struct Error {
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pub kind: ErrorKind,
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pub span: Range<usize>,
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}
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#[derive(Debug)]
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pub enum ErrorKind {
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SyntaxError(String),
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UnexpectedEof,
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UnexpectedToken(Token),
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InvalidIdentifier,
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UnknownVariable(String),
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MeloVariable(String),
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TopLevelBreak,
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BfInterpretError(InterpretError),
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MismatchedArgumentError,
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MissingLhs,
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IOError(io::Error),
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}
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impl Error {
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pub fn new(kind: ErrorKind, span: Range<usize>) -> Self {
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Self { kind, span }
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}
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/// Create an UnexpectedEof error, where the EOF occurs at the
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/// given index in the file.
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pub fn unexpected_eof(index: usize) -> Self {
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Self::new(ErrorKind::UnexpectedEof, index..index)
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}
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}
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impl Display for Error {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(
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f,
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"Error at range {}-{}: {}",
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self.span.start, self.span.end, self.kind
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)
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}
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}
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impl std::error::Error for Error {}
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impl Display for ErrorKind {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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ErrorKind::SyntaxError(desc) => write!(f, "syntax error: {}", desc),
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ErrorKind::UnexpectedEof => write!(f, "unexpected end of file"),
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ErrorKind::UnexpectedToken(token) => write!(f, "unexpected token {:?}", token),
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ErrorKind::InvalidIdentifier => write!(f, "invalid identifier"),
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ErrorKind::UnknownVariable(name) => write!(f, "unknown identifier \"{}\"", name),
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ErrorKind::MeloVariable(name) => write!(f, "banned variable \"{}\"", name),
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ErrorKind::TopLevelBreak => write!(f, "can only `break` out of a loop"),
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ErrorKind::BfInterpretError(err) => write!(f, "brainfuck error: {}", err),
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// TODO: give concrete numbers here.
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ErrorKind::MismatchedArgumentError => write!(f, "wrong number of function arguments"),
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ErrorKind::MissingLhs => write!(f, "missing expression before binary operation"),
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ErrorKind::IOError(err) => write!(f, "I/O error: {}", err),
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}
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}
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}
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impl From<io::Error> for Error {
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fn from(e: io::Error) -> Self {
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Self {
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kind: ErrorKind::IOError(e),
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span: 0..0,
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}
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}
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}
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