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use std::{borrow::Cow, error, fmt};
#[derive(Debug, PartialEq)]
#[non_exhaustive]
pub enum Error {
InvalidExpression(ExpressionParseError),
UnknownTargetTriple(TripleParseError),
UnknownPlatformTriple(TripleParseError),
UnknownPredicate(String),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Error::InvalidExpression(_) => write!(f, "invalid cfg() expression"),
Error::UnknownTargetTriple(_) => write!(f, "unknown target triple"),
Error::UnknownPlatformTriple(_) => {
write!(f, "unknown platform triple")
}
Error::UnknownPredicate(pred) => {
write!(f, "cfg() expression has unknown predicate: {}", pred)
}
}
}
}
impl error::Error for Error {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
Error::InvalidExpression(err) => Some(err),
Error::UnknownTargetTriple(err) => Some(err),
Error::UnknownPlatformTriple(err) => Some(err),
Error::UnknownPredicate(_) => None,
}
}
}
#[derive(Debug, PartialEq)]
pub struct ExpressionParseError {
inner: cfg_expr::ParseError,
}
impl ExpressionParseError {
pub(crate) fn new(inner: cfg_expr::ParseError) -> Self {
Self { inner }
}
}
impl fmt::Display for ExpressionParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "expression parse error")
}
}
impl error::Error for ExpressionParseError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
Some(&self.inner)
}
}
#[derive(Debug, PartialEq)]
pub struct TripleParseError {
triple_str: Cow<'static, str>,
lexicon_err: cfg_expr::target_lexicon::ParseError,
}
impl TripleParseError {
pub(crate) fn new(
triple_str: Cow<'static, str>,
lexicon_err: cfg_expr::target_lexicon::ParseError,
) -> Self {
Self {
triple_str,
lexicon_err,
}
}
pub fn triple_str(&self) -> &str {
&self.triple_str
}
}
impl fmt::Display for TripleParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "unknown triple string: {}", self.triple_str)
}
}
impl error::Error for TripleParseError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
Some(&self.lexicon_err)
}
}