67 lines
1.9 KiB
Rust
67 lines
1.9 KiB
Rust
use crate::util::AnyValueId;
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/// Violation of [`ArgMatches`][crate::ArgMatches] assumptions
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#[derive(Clone, Debug)]
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#[allow(missing_copy_implementations)] // We might add non-Copy types in the future
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#[non_exhaustive]
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pub enum MatchesError {
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/// Failed to downcast `AnyValue` to the specified type
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#[non_exhaustive]
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Downcast {
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/// Type for value stored in [`ArgMatches`][crate::ArgMatches]
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actual: AnyValueId,
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/// The target type to downcast to
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expected: AnyValueId,
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},
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/// Argument not defined in [`Command`][crate::Command]
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#[non_exhaustive]
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UnknownArgument {
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// Missing `id` but blocked on a public id type which will hopefully come with `unstable-v4`
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},
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}
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impl MatchesError {
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#[cfg_attr(debug_assertions, track_caller)]
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pub(crate) fn unwrap<T>(id: &str, r: Result<T, Self>) -> T {
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let err = match r {
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Ok(t) => {
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return t;
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}
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Err(err) => err,
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};
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panic!("Mismatch between definition and access of `{id}`. {err}",)
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}
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}
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impl std::error::Error for MatchesError {}
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impl std::fmt::Display for MatchesError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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Self::Downcast { actual, expected } => {
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writeln!(
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f,
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"Could not downcast to {expected:?}, need to downcast to {actual:?}"
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)
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}
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Self::UnknownArgument {} => {
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writeln!(
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f,
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"Unknown argument or group id. Make sure you are using the argument id and not the short or long flags"
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)
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}
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}
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}
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}
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#[test]
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fn check_auto_traits() {
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static_assertions::assert_impl_all!(
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MatchesError: Send,
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Sync,
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std::panic::RefUnwindSafe,
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std::panic::UnwindSafe,
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Unpin
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);
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}
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