Vendor things

third-party/vendor/uuid/src/macros.rs

@@ -0,0 +1,92 @@
+macro_rules! define_uuid_macro {
+    {$(#[$doc:meta])*} => {
+        $(#[$doc])*
+        #[cfg(feature = "macro-diagnostics")]
+        #[macro_export]
+        macro_rules! uuid {
+            ($uuid:literal) => {{
+                $crate::Uuid::from_bytes($crate::uuid_macro_internal::parse_lit!($uuid))
+            }};
+        }
+
+        $(#[$doc])*
+        #[cfg(not(feature = "macro-diagnostics"))]
+        #[macro_export]
+        macro_rules! uuid {
+            ($uuid:literal) => {{
+                const OUTPUT: $crate::Uuid = match $crate::Uuid::try_parse($uuid) {
+                    $crate::__macro_support::Ok(u) => u,
+                    $crate::__macro_support::Err(_) => panic!("invalid UUID"),
+                };
+                OUTPUT
+            }};
+        }
+    }
+}
+
+define_uuid_macro! {
+/// Parse [`Uuid`][uuid::Uuid]s from string literals at compile time.
+///
+/// ## Usage
+///
+/// This macro transforms the string literal representation of a
+/// [`Uuid`][uuid::Uuid] into the bytes representation, raising a compilation
+/// error if it cannot properly be parsed.
+///
+/// ## Examples
+///
+/// Setting a global constant:
+///
+/// ```
+/// # use uuid::{uuid, Uuid};
+/// pub const SCHEMA_ATTR_CLASS: Uuid = uuid!("00000000-0000-0000-0000-ffff00000000");
+/// pub const SCHEMA_ATTR_UUID: Uuid = uuid!("00000000-0000-0000-0000-ffff00000001");
+/// pub const SCHEMA_ATTR_NAME: Uuid = uuid!("00000000-0000-0000-0000-ffff00000002");
+/// ```
+///
+/// Defining a local variable:
+///
+/// ```
+/// # use uuid::uuid;
+/// let uuid = uuid!("urn:uuid:F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4");
+/// ```
+///
+/// ## Compilation Failures
+///
+/// Invalid UUIDs are rejected:
+///
+/// ```compile_fail
+/// # use uuid::uuid;
+/// let uuid = uuid!("F9168C5E-ZEB2-4FAA-B6BF-329BF39FA1E4");
+/// ```
+///
+/// Enable the feature `macro-diagnostics` to see the error messages below.
+///
+/// Provides the following compilation error:
+///
+/// ```txt
+/// error: invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found Z at 9
+///     |
+///     |     let id = uuid!("F9168C5E-ZEB2-4FAA-B6BF-329BF39FA1E4");
+///     |                              ^
+/// ```
+///
+/// Tokens that aren't string literals are also rejected:
+///
+/// ```compile_fail
+/// # use uuid::uuid;
+/// let uuid_str: &str = "550e8400e29b41d4a716446655440000";
+/// let uuid = uuid!(uuid_str);
+/// ```
+///
+/// Provides the following compilation error:
+///
+/// ```txt
+/// error: expected string literal
+///   |
+///   |     let uuid = uuid!(uuid_str);
+///   |                      ^^^^^^^^
+/// ```
+///
+/// [uuid::Uuid]: https://docs.rs/uuid/*/uuid/struct.Uuid.html
+}