0764df28b5
Give these crates each a more standard directory layout with sources in a 'src' sub-sirectory and Cargo.toml in the top lib/foo directory. Add license and description fields to each. The build script for the cretonne crate now lives in 'lib/cretonne/build.rs' separating it from the normal library sources under 'lib/cretonne/src'.
45 lines
1.0 KiB
Rust
45 lines
1.0 KiB
Rust
//! Define the `Location`, `Error`, and `Result` types.
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#![macro_use]
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use std::fmt;
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use std::result;
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/// The location of a `Token` or `Error`.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
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pub struct Location {
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pub line_number: usize,
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}
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/// A parse error is returned when the parse failed.
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#[derive(Debug)]
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pub struct Error {
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pub location: Location,
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pub message: String,
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}: {}", self.location.line_number, self.message)
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}
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}
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pub type Result<T> = result::Result<T, Error>;
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// Create an `Err` variant of `Result<X>` from a location and `format!` args.
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macro_rules! err {
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( $loc:expr, $msg:expr ) => {
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Err($crate::Error {
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location: $loc.clone(),
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message: String::from($msg),
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})
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};
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( $loc:expr, $fmt:expr, $( $arg:expr ),+ ) => {
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Err($crate::Error {
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location: $loc.clone(),
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message: format!( $fmt, $( $arg ),+ ),
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})
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};
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}
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