equator 0.3.0

Composable assertion library
Documentation 
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use crate::{
    decompose::{PtrToDebug, PtrToDeref},
    spec::{
        debug::{CmpDebugWrapper, DebugWrapper},
        sized::{CmpSizedWrapper, SizedWrapper},
        Wrapper,
    },
    Cmp, DisplayCmp,
};
use core::fmt;

#[repr(transparent)]
#[derive(Copy, Clone)]
pub struct ByVal<T>(pub T);

#[repr(transparent)]
#[derive(Copy, Clone)]
pub struct ByRef<T>(pub T);

impl<T: fmt::Debug> fmt::Debug for ByVal<T> {
    #[inline(always)]
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.0.fmt(f)
    }
}

impl<T: fmt::Debug> fmt::Debug for ByRef<T> {
    #[inline(always)]
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.0.fmt(f)
    }
}

impl<T> ByRef<T> {
    #[inline(always)]
    pub fn get_ptr(&self) -> *const () {
        self as *const _ as *const ()
    }
}

impl<T: Copy> ByVal<T> {
    #[inline(always)]
    pub fn get_ptr(self) -> *const () {
        core::assert!(core::mem::size_of::<T>() <= core::mem::size_of::<*const ()>());
        core::assert!(core::mem::align_of::<T>() <= core::mem::align_of::<*const ()>());
        let mut out = core::ptr::null::<()>();
        unsafe {
            *((&mut out) as *mut *const () as *mut T) = self.0;
        };
        out
    }
}

impl<C: DisplayCmp> DisplayCmp for CmpByValWrapper<C> {
    #[inline(always)]
    fn fmt(&self, lhs: &str, rhs: &str, f: &mut fmt::Formatter) -> fmt::Result {
        self.0.fmt(lhs, rhs, f)
    }
}

impl<Lhs, Rhs, C: Cmp<Lhs, Rhs>> Cmp<ByVal<Lhs>, ByVal<Rhs>> for CmpByValWrapper<C> {
    #[inline(always)]
    fn test(&self, lhs: &ByVal<Lhs>, rhs: &ByVal<Rhs>) -> bool {
        self.0.test(&lhs.0, &rhs.0)
    }
}
impl<Lhs, Rhs, C: Cmp<Lhs, Rhs>> Cmp<&ByRef<Lhs>, ByVal<Rhs>> for CmpByValWrapper<C> {
    #[inline(always)]
    fn test(&self, lhs: &&ByRef<Lhs>, rhs: &ByVal<Rhs>) -> bool {
        self.0.test(&lhs.0, &rhs.0)
    }
}
impl<Lhs, Rhs, C: Cmp<Lhs, Rhs>> Cmp<ByVal<Lhs>, &ByRef<Rhs>> for CmpByValWrapper<C> {
    #[inline(always)]
    fn test(&self, lhs: &ByVal<Lhs>, rhs: &&ByRef<Rhs>) -> bool {
        self.0.test(&lhs.0, &rhs.0)
    }
}
impl<Lhs, Rhs, C: Cmp<Lhs, Rhs>> Cmp<&ByRef<Lhs>, &ByRef<Rhs>> for CmpByValWrapper<C> {
    #[inline(always)]
    fn test(&self, lhs: &&ByRef<Lhs>, rhs: &&ByRef<Rhs>) -> bool {
        self.0.test(&lhs.0, &rhs.0)
    }
}

impl ByValWrap {
    #[inline(always)]
    pub fn do_wrap<T: Copy>(self, value: &T) -> ByVal<T> {
        ByVal(*value)
    }
}
impl ByRefWrap {
    #[inline(always)]
    pub fn do_wrap<T>(self, value: &T) -> &ByRef<T> {
        unsafe { &*(value as *const T as *const _) }
    }
}

impl<C> CmpByValWrapper<CmpSizedWrapper<CmpDebugWrapper<C>>> {
    #[inline(always)]
    pub fn from_ref(this: CmpSizedWrapper<CmpDebugWrapper<&C>>) -> &Self {
        unsafe { &*(this.0 .0 as *const C as *const Self) }
    }
}
impl TryByValWrap for &Wrapper<&SizedWrapper<DebugWrapper<usize>>> {
    type Wrap = ByValWrap;

    #[inline]
    fn wrap_by_val(&self) -> Self::Wrap {
        ByValWrap
    }
}
impl<T> TryByValWrap for Wrapper<T> {
    type Wrap = ByRefWrap;

    #[inline]
    fn wrap_by_val(&self) -> Self::Wrap {
        ByRefWrap
    }
}

pub struct ByValWrap;
pub struct ByRefWrap;

#[repr(transparent)]
#[derive(Copy, Clone)]
pub struct CmpByValWrapper<T>(pub T);

pub trait TryByValWrap {
    type Wrap;
    fn wrap_by_val(&self) -> Self::Wrap;
}

pub(crate) trait DebugVTable {
    const VTABLE: PtrToDebug;
}
pub(crate) trait DerefVTable {
    type Inner;
    const VTABLE: unsafe fn(*const *const ()) -> *const ();
}

unsafe fn no_deref(ptr: *const *const ()) -> *const () {
    ptr as *const ()
}
unsafe fn deref(ptr: *const *const ()) -> *const () {
    *ptr
}

impl<T> DerefVTable for ByVal<T> {
    type Inner = T;
    const VTABLE: PtrToDeref = { no_deref };
}
impl<T> DerefVTable for &ByRef<T> {
    type Inner = T;
    const VTABLE: PtrToDeref = { deref };
}

impl<T: fmt::Debug> DebugVTable for ByVal<T> {
    const VTABLE: PtrToDebug = as_debug_vptr::<T>;
}
impl<T: fmt::Debug> DebugVTable for &ByRef<T> {
    const VTABLE: PtrToDebug = as_debug_vptr::<T>;
}

unsafe fn as_debug_vptr<T: fmt::Debug>(ptr: *const ()) -> &'static dyn fmt::Debug {
    core::mem::transmute::<&'_ dyn fmt::Debug, &'static dyn fmt::Debug>(
        (&*(ptr as *const T)) as &dyn fmt::Debug,
    )
}