cranelift_reader/
error.rs

1//! Define the `Location`, `ParseError`, and `ParseResult` types.
2
3#![macro_use]
4
5use std::fmt;
6
7/// The location of a `Token` or `Error`.
8#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
9pub struct Location {
10    /// Line number. Command-line arguments are line 0 and source file
11    /// lines start from 1.
12    pub line_number: usize,
13}
14
15/// A parse error is returned when the parse failed.
16#[derive(Debug)]
17pub struct ParseError {
18    /// Location of the error.
19    pub location: Location,
20    /// Error message.
21    pub message: String,
22    /// Whether it's a warning or a plain error.
23    pub is_warning: bool,
24}
25
26impl fmt::Display for ParseError {
27    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
28        if self.location.line_number == 0 {
29            write!(f, "command-line arguments: {}", self.message)
30        } else {
31            write!(f, "{}: {}", self.location.line_number, self.message)
32        }
33    }
34}
35
36impl std::error::Error for ParseError {}
37
38/// Result of a parser operation. The `ParseError` variant includes a location.
39pub type ParseResult<T> = Result<T, ParseError>;
40
41// Create an `Err` variant of `ParseResult<X>` from a location and `format!` args.
42macro_rules! err {
43    ( $loc:expr, $msg:expr ) => {
44        Err($crate::ParseError {
45            location: $loc.clone(),
46            message: $msg.to_string(),
47            is_warning: false,
48        })
49    };
50
51    ( $loc:expr, $fmt:expr, $( $arg:expr ),+ ) => {
52        Err($crate::ParseError {
53            location: $loc.clone(),
54            message: format!( $fmt, $( $arg ),+ ),
55            is_warning: false,
56        })
57    };
58}
59
60macro_rules! warn {
61    ( $loc:expr, $fmt:expr, $( $arg:expr ),+ ) => {
62        Err($crate::ParseError {
63            location: $loc.clone(),
64            message: format!($fmt, $( $arg ),+ ),
65            is_warning: true,
66        })
67    };
68}
cranelift_reader/error.rs

cranelift_reader/
error.rs
