mirror of https://github.com/zkat/miette.git
62 lines
1.3 KiB
Rust
62 lines
1.3 KiB
Rust
use crate::protocol::{LabeledSpan, SourceSpan};
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// Huge thanks to @jam1gamer for this hack:
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// https://twitter.com/jam1garner/status/1515887996444323840
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#[doc(hidden)]
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pub trait IsOption {}
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impl<T> IsOption for Option<T> {}
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#[doc(hidden)]
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#[derive(Debug, Default)]
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pub struct OptionalWrapper<T>(pub core::marker::PhantomData<T>);
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impl<T> OptionalWrapper<T> {
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pub fn new() -> Self {
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Self(core::marker::PhantomData)
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}
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}
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#[doc(hidden)]
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pub trait ToOption {
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#[doc(hidden)]
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fn to_option<T>(self, value: T) -> Option<T>;
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}
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impl<T> OptionalWrapper<T>
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where
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T: IsOption,
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{
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#[doc(hidden)]
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pub fn to_option(self, value: &T) -> &T {
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value
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}
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}
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impl<T> ToOption for &OptionalWrapper<T> {
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fn to_option<U>(self, value: U) -> Option<U> {
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Some(value)
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}
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}
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#[doc(hidden)]
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#[derive(Debug)]
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pub struct ToLabelSpanWrapper {}
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pub trait ToLabeledSpan<T> {
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#[doc(hidden)]
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fn to_labeled_span(span: T) -> LabeledSpan;
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}
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impl ToLabeledSpan<LabeledSpan> for ToLabelSpanWrapper {
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fn to_labeled_span(span: LabeledSpan) -> LabeledSpan {
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span
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}
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}
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impl<T> ToLabeledSpan<T> for ToLabelSpanWrapper
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where
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T: Into<SourceSpan>,
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{
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fn to_labeled_span(span: T) -> LabeledSpan {
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LabeledSpan::new_with_span(None, span.into())
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}
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}
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