From 611512bbebfe3c62e741a142b00c04c679de8e81 Mon Sep 17 00:00:00 2001
From: U2A5F <U2A5F@outlook.com>
Date: Tue, 21 Nov 2023 22:27:23 +0800
Subject: [PATCH] selection sort

---
 README.md          |  11 +++++
 tuples/Cargo.toml  |   4 +-
 tuples/src/lib.rs  |   5 +++
 tuples/src/sort.rs | 108 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 127 insertions(+), 1 deletion(-)
 create mode 100644 tuples/src/sort.rs

diff --git a/README.md b/README.md
index 5c2a309..87dc5a1 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ Provides many useful tools related to tuples
 - Shorthand Macro
 - Call
 - Apply
+- Sort
 
 ## Examples
 
@@ -245,3 +246,13 @@ Provides many useful tools related to tuples
     let r = foo.apply_tuple(a);
     assert_eq!(r, 6)
     ```
+- sort  
+    currently implemented
+
+    - selection sort
+
+        ```rust
+        let mut a = (6, 2, 6, 8, 0, 5);
+        a.sort_selection();
+        assert_eq!(a, (0, 2, 5, 6, 6, 8))
+        ```
diff --git a/tuples/Cargo.toml b/tuples/Cargo.toml
index 67af2e4..e283057 100644
--- a/tuples/Cargo.toml
+++ b/tuples/Cargo.toml
@@ -8,7 +8,7 @@ license = "MIT"
 name = "tuples"
 readme = "../README.md"
 repository = "https://github.com/libsugar/tuplers"
-version = "1.13.0"
+version = "1.14.0"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -35,10 +35,12 @@ default = [
   "re-exports",
   "capt",
   "tuple_get",
+  "sort",
 ]
 flatten = []
 re-exports = []
 shorthand = []
+sort = ["tuple_meta", "tuple_get"]
 split = ["split_parts", "split_by", "split_to_tuple_by", "split_at", "split_to_tuple_at"]
 split_at = []
 split_by = []
diff --git a/tuples/src/lib.rs b/tuples/src/lib.rs
index 611e91e..aa53627 100644
--- a/tuples/src/lib.rs
+++ b/tuples/src/lib.rs
@@ -195,3 +195,8 @@ pub use capt::*;
 pub mod tuple_get;
 #[cfg(all(feature = "tuple_get", feature = "re-exports"))]
 pub use tuple_get::*;
+
+#[cfg(all(feature = "sort", feature = "tuple_meta", feature = "tuple_get"))]
+pub mod sort;
+#[cfg(all(feature = "sort", feature = "tuple_meta", feature = "tuple_get", feature = "re-exports"))]
+pub use sort::*;
diff --git a/tuples/src/sort.rs b/tuples/src/sort.rs
new file mode 100644
index 0000000..67620e3
--- /dev/null
+++ b/tuples/src/sort.rs
@@ -0,0 +1,108 @@
+//! Sort tuples
+
+use crate::{TupleGetMut, TupleSame};
+
+/// Sort tuples using selection sort
+pub trait TupleSortSelection<T> {
+    /// Sort tuples using selection sort
+    ///
+    /// It has an `O(n2)` time complexity
+    fn sort_selection(&mut self);
+}
+
+impl<T: PartialOrd, S: TupleSame<T> + TupleGetMut<Output = T>> TupleSortSelection<T> for S {
+    #[inline]
+    fn sort_selection(&mut self) {
+        if sort_base(self, T::lt) {
+            return;
+        }
+        selection_sort(self, T::lt)
+    }
+}
+
+fn sort_base<T, S: TupleSame<T> + TupleGetMut<Output = T>>(v: &mut S, mut is_less: impl FnMut(&T, &T) -> bool) -> bool {
+    if core::mem::size_of::<T>() == 0 {
+        return true;
+    }
+
+    let len = v.arity();
+    if len <= 1 {
+        return true;
+    }
+    if len == 2 {
+        let this = v as *mut S;
+        let a = unsafe { (&mut *this).get_mut(0) };
+        let b = unsafe { (&mut *this).get_mut(1) };
+
+        if is_less(a, b) {
+            return true;
+        } else if is_less(b, a) {
+            core::mem::swap(a, b);
+            return true;
+        } else {
+            return true;
+        }
+    }
+
+    false
+}
+
+fn selection_sort<T, S: TupleSame<T> + TupleGetMut<Output = T>>(v: &mut S, mut is_less: impl FnMut(&T, &T) -> bool) {
+    let len = v.arity();
+    for i in 0..(len - 1) {
+        let mut min_index = i;
+
+        for j in (i + 1)..len {
+            if is_less(v.get(j), v.get(min_index)) {
+                min_index = j;
+            }
+        }
+
+        if min_index != i {
+            let this = v as *mut S;
+            let a = unsafe { (&mut *this).get_mut(i) };
+            let b = unsafe { (&mut *this).get_mut(min_index) };
+            core::mem::swap(a, b);
+        }
+    }
+}
+
+#[cfg(test)]
+mod test_selection_sort {
+    use super::*;
+
+    #[test]
+    fn test1() {
+        let mut a = (6, 2, 6, 8, 0, 5);
+        a.sort_selection();
+        assert_eq!(a, (0, 2, 5, 6, 6, 8))
+    }
+
+    #[test]
+    fn test2() {
+        let mut a = (1, 2, 3, 4, 5, 6);
+        a.sort_selection();
+        assert_eq!(a, (1, 2, 3, 4, 5, 6))
+    }
+
+    #[test]
+    fn test3() {
+        let mut a = (2, 1);
+        a.sort_selection();
+        assert_eq!(a, (1, 2))
+    }
+
+    #[test]
+    fn test4() {
+        let mut a = (1, 2);
+        a.sort_selection();
+        assert_eq!(a, (1, 2))
+    }
+
+    #[test]
+    fn test5() {
+        let mut a = (1.5, 7.1, 3.0, 9.9, 0.3, 0.125, 0.1 + 0.2);
+        a.sort_selection();
+        assert_eq!(a, (0.125, 0.3, 0.1 + 0.2, 1.5, 3.0, 7.1, 9.9))
+    }
+}