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Diffstat (limited to '')
-rw-r--r-- | vendor/clap/src/util/id.rs | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/vendor/clap/src/util/id.rs b/vendor/clap/src/util/id.rs new file mode 100644 index 000000000..63a7e003e --- /dev/null +++ b/vendor/clap/src/util/id.rs @@ -0,0 +1,92 @@ +use crate::util::fnv::Key; + +use std::{ + fmt::{Debug, Formatter, Result}, + hash::{Hash, Hasher}, + ops::Deref, +}; + +#[derive(Clone, Eq, Default)] +#[cfg_attr(not(debug_assertions), repr(transparent))] +pub(crate) struct Id { + #[cfg(debug_assertions)] + name: String, + id: u64, +} + +macro_rules! precomputed_hashes { + ($($fn_name:ident, $const:expr, $name:expr;)*) => { + impl Id { + $( + pub(crate) fn $fn_name() -> Self { + Id { + #[cfg(debug_assertions)] + name: $name.into(), + id: $const, + } + } + )* + } + }; +} + +// precompute some common values +precomputed_hashes! { + empty_hash, 0x1C9D_3ADB_639F_298E, ""; + help_hash, 0x5963_6393_CFFB_FE5F, "help"; + version_hash, 0x30FF_0B7C_4D07_9478, "version"; +} + +impl Id { + pub(crate) fn from_ref<T: Key>(val: T) -> Self { + Id { + #[cfg(debug_assertions)] + name: val.to_string(), + id: val.key(), + } + } +} + +impl Debug for Id { + fn fmt(&self, f: &mut Formatter) -> Result { + #[cfg(debug_assertions)] + write!(f, "{}", self.name)?; + #[cfg(not(debug_assertions))] + write!(f, "[hash: {:X}]", self.id)?; + + Ok(()) + } +} + +impl Deref for Id { + type Target = u64; + + fn deref(&self) -> &Self::Target { + &self.id + } +} + +impl<T: Key> From<T> for Id { + fn from(val: T) -> Self { + Id { + #[cfg(debug_assertions)] + name: val.to_string(), + id: val.key(), + } + } +} + +impl Hash for Id { + fn hash<H>(&self, state: &mut H) + where + H: Hasher, + { + self.id.hash(state) + } +} + +impl PartialEq for Id { + fn eq(&self, other: &Id) -> bool { + self.id == other.id + } +} |