52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
// SPDX-License-Identifier: CC0-1.0
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//! # Error
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//!
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//! Error handling macros and helpers.
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//!
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pub mod input_string;
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mod parse_error;
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pub use input_string::InputString;
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/// Formats error.
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///
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/// If `std` feature is OFF appends error source (delimited by `: `). We do this because
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/// `e.source()` is only available in std builds, without this macro the error source is lost for
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/// no-std builds.
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#[macro_export]
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macro_rules! write_err {
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($writer:expr, $string:literal $(, $args:expr)*; $source:expr) => {
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{
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#[cfg(feature = "std")]
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{
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let _ = &$source; // Prevents clippy warnings.
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write!($writer, $string $(, $args)*)
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}
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#[cfg(not(feature = "std"))]
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{
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write!($writer, concat!($string, ": {}") $(, $args)*, $source)
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}
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}
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}
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}
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/// Impls std::error::Error for the specified type with appropriate attributes, possibly returning
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/// source.
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#[macro_export]
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macro_rules! impl_std_error {
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// No source available
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($type:ty) => {
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#[cfg(feature = "std")]
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impl std::error::Error for $type {}
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};
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// Struct with $field as source
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($type:ty, $field:ident) => {
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#[cfg(feature = "std")]
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impl std::error::Error for $type {
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fn source(&self) -> Option<&(dyn std::error::Error + 'static)> { Some(&self.$field) }
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}
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};
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}
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