cargo_platform/
error.rs

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1use std::fmt;
2
3#[derive(Debug)]
4pub struct ParseError {
5    kind: ParseErrorKind,
6    orig: String,
7}
8
9#[non_exhaustive]
10#[derive(Debug)]
11pub enum ParseErrorKind {
12    UnterminatedString,
13    UnexpectedChar(char),
14    UnexpectedToken {
15        expected: &'static str,
16        found: &'static str,
17    },
18    IncompleteExpr(&'static str),
19    UnterminatedExpression(String),
20    InvalidTarget(String),
21}
22
23impl fmt::Display for ParseError {
24    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
25        write!(
26            f,
27            "failed to parse `{}` as a cfg expression: {}",
28            self.orig, self.kind
29        )
30    }
31}
32
33impl fmt::Display for ParseErrorKind {
34    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
35        use ParseErrorKind::*;
36        match self {
37            UnterminatedString => write!(f, "unterminated string in cfg"),
38            UnexpectedChar(ch) => write!(
39                f,
40                "unexpected character `{}` in cfg, expected parens, a comma, \
41                 an identifier, or a string",
42                ch
43            ),
44            UnexpectedToken { expected, found } => {
45                write!(f, "expected {}, found {}", expected, found)
46            }
47            IncompleteExpr(expected) => {
48                write!(f, "expected {}, but cfg expression ended", expected)
49            }
50            UnterminatedExpression(s) => {
51                write!(f, "unexpected content `{}` found after cfg expression", s)
52            }
53            InvalidTarget(s) => write!(f, "invalid target specifier: {}", s),
54        }
55    }
56}
57
58impl std::error::Error for ParseError {}
59
60impl ParseError {
61    pub fn new(orig: &str, kind: ParseErrorKind) -> ParseError {
62        ParseError {
63            kind,
64            orig: orig.to_string(),
65        }
66    }
67}
cargo_platform/error.rs

cargo_platform/
error.rs
