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use std::fmt;
#[derive(Debug)]
pub struct ParseError {
kind: ParseErrorKind,
orig: String,
}
#[non_exhaustive]
#[derive(Debug)]
pub enum ParseErrorKind {
UnterminatedString,
UnexpectedChar(char),
UnexpectedToken {
expected: &'static str,
found: &'static str,
},
IncompleteExpr(&'static str),
UnterminatedExpression(String),
InvalidTarget(String),
}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"failed to parse `{}` as a cfg expression: {}",
self.orig, self.kind
)
}
}
impl fmt::Display for ParseErrorKind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use ParseErrorKind::*;
match self {
UnterminatedString => write!(f, "unterminated string in cfg"),
UnexpectedChar(ch) => write!(
f,
"unexpected character `{}` in cfg, expected parens, a comma, \
an identifier, or a string",
ch
),
UnexpectedToken { expected, found } => {
write!(f, "expected {}, found {}", expected, found)
}
IncompleteExpr(expected) => {
write!(f, "expected {}, but cfg expression ended", expected)
}
UnterminatedExpression(s) => {
write!(f, "unexpected content `{}` found after cfg expression", s)
}
InvalidTarget(s) => write!(f, "invalid target specifier: {}", s),
}
}
}
impl std::error::Error for ParseError {}
impl ParseError {
pub fn new(orig: &str, kind: ParseErrorKind) -> ParseError {
ParseError {
kind,
orig: orig.to_string(),
}
}
}