From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Mon, 8 Jan 2024 01:21:28 +0400
Subject: Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>
---
 vendor/miette/src/eyreish/ptr.rs | 188 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 188 insertions(+)
 create mode 100644 vendor/miette/src/eyreish/ptr.rs

(limited to 'vendor/miette/src/eyreish/ptr.rs')

diff --git a/vendor/miette/src/eyreish/ptr.rs b/vendor/miette/src/eyreish/ptr.rs
new file mode 100644
index 0000000..fa954d1
--- /dev/null
+++ b/vendor/miette/src/eyreish/ptr.rs
@@ -0,0 +1,188 @@
+use std::{marker::PhantomData, ptr::NonNull};
+
+#[repr(transparent)]
+/// A raw pointer that owns its pointee
+pub(crate) struct Own<T>
+where
+    T: ?Sized,
+{
+    pub(crate) ptr: NonNull<T>,
+}
+
+unsafe impl<T> Send for Own<T> where T: ?Sized {}
+unsafe impl<T> Sync for Own<T> where T: ?Sized {}
+
+impl<T> Copy for Own<T> where T: ?Sized {}
+
+impl<T> Clone for Own<T>
+where
+    T: ?Sized,
+{
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl<T> Own<T>
+where
+    T: ?Sized,
+{
+    pub(crate) fn new(ptr: Box<T>) -> Self {
+        Own {
+            ptr: unsafe { NonNull::new_unchecked(Box::into_raw(ptr)) },
+        }
+    }
+
+    pub(crate) fn cast<U: CastTo>(self) -> Own<U::Target> {
+        Own {
+            ptr: self.ptr.cast(),
+        }
+    }
+
+    pub(crate) unsafe fn boxed(self) -> Box<T> {
+        Box::from_raw(self.ptr.as_ptr())
+    }
+
+    pub(crate) const fn by_ref<'a>(&self) -> Ref<'a, T> {
+        Ref {
+            ptr: self.ptr,
+            lifetime: PhantomData,
+        }
+    }
+
+    pub(crate) fn by_mut<'a>(self) -> Mut<'a, T> {
+        Mut {
+            ptr: self.ptr,
+            lifetime: PhantomData,
+        }
+    }
+}
+
+#[allow(explicit_outlives_requirements)]
+#[repr(transparent)]
+/// A raw pointer that represents a shared borrow of its pointee
+pub(crate) struct Ref<'a, T>
+where
+    T: ?Sized,
+{
+    pub(crate) ptr: NonNull<T>,
+    lifetime: PhantomData<&'a T>,
+}
+
+impl<'a, T> Copy for Ref<'a, T> where T: ?Sized {}
+
+impl<'a, T> Clone for Ref<'a, T>
+where
+    T: ?Sized,
+{
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl<'a, T> Ref<'a, T>
+where
+    T: ?Sized,
+{
+    pub(crate) fn new(ptr: &'a T) -> Self {
+        Ref {
+            ptr: NonNull::from(ptr),
+            lifetime: PhantomData,
+        }
+    }
+
+    pub(crate) const fn from_raw(ptr: NonNull<T>) -> Self {
+        Ref {
+            ptr,
+            lifetime: PhantomData,
+        }
+    }
+
+    pub(crate) fn cast<U: CastTo>(self) -> Ref<'a, U::Target> {
+        Ref {
+            ptr: self.ptr.cast(),
+            lifetime: PhantomData,
+        }
+    }
+
+    pub(crate) fn by_mut(self) -> Mut<'a, T> {
+        Mut {
+            ptr: self.ptr,
+            lifetime: PhantomData,
+        }
+    }
+
+    pub(crate) const fn as_ptr(self) -> *const T {
+        self.ptr.as_ptr() as *const T
+    }
+
+    pub(crate) unsafe fn deref(self) -> &'a T {
+        &*self.ptr.as_ptr()
+    }
+}
+
+#[allow(explicit_outlives_requirements)]
+#[repr(transparent)]
+/// A raw pointer that represents a unique borrow of its pointee
+pub(crate) struct Mut<'a, T>
+where
+    T: ?Sized,
+{
+    pub(crate) ptr: NonNull<T>,
+    lifetime: PhantomData<&'a mut T>,
+}
+
+impl<'a, T> Copy for Mut<'a, T> where T: ?Sized {}
+
+impl<'a, T> Clone for Mut<'a, T>
+where
+    T: ?Sized,
+{
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl<'a, T> Mut<'a, T>
+where
+    T: ?Sized,
+{
+    pub(crate) fn cast<U: CastTo>(self) -> Mut<'a, U::Target> {
+        Mut {
+            ptr: self.ptr.cast(),
+            lifetime: PhantomData,
+        }
+    }
+
+    pub(crate) const fn by_ref(self) -> Ref<'a, T> {
+        Ref {
+            ptr: self.ptr,
+            lifetime: PhantomData,
+        }
+    }
+
+    pub(crate) fn extend<'b>(self) -> Mut<'b, T> {
+        Mut {
+            ptr: self.ptr,
+            lifetime: PhantomData,
+        }
+    }
+
+    pub(crate) unsafe fn deref_mut(self) -> &'a mut T {
+        &mut *self.ptr.as_ptr()
+    }
+}
+
+impl<'a, T> Mut<'a, T> {
+    pub(crate) unsafe fn read(self) -> T {
+        self.ptr.as_ptr().read()
+    }
+}
+
+pub(crate) trait CastTo {
+    type Target;
+}
+
+impl<T> CastTo for T {
+    type Target = T;
+}
-- 
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