mirror of
https://github.com/Ed94/Odin.git
synced 2026-06-13 09:22:22 -07:00
gingerBill
629 lines
12 KiB
Odin
629 lines
12 KiB
Odin
package slice
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import "core:intrinsics"
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_ :: intrinsics;
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ORD :: intrinsics.type_is_ordered;
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Ordering :: enum {
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Less = -1,
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Equal = 0,
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Greater = +1,
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}
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cmp :: proc(a, b: $E) -> Ordering where ORD(E) {
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switch {
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case a < b:
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return .Less;
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case a > b:
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return .Greater;
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}
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return .Equal;
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}
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cmp_proc :: proc($E: typeid) -> (proc(E, E) -> Ordering) where ORD(E) {
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return proc(a, b: E) -> Ordering {
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switch {
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case a < b:
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return .Less;
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case a > b:
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return .Greater;
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}
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return .Equal;
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};
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}
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// sort sorts a slice
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// This sort is not guaranteed to be stable
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sort :: proc(data: $T/[]$E) where ORD(E) {
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when size_of(E) != 0 {
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if n := len(data); n > 1 {
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_quick_sort(data, 0, n, _max_depth(n));
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}
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}
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}
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// sort_by sorts a slice with a given procedure to test whether two values are ordered "i < j"
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// This sort is not guaranteed to be stable
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sort_by :: proc(data: $T/[]$E, less: proc(i, j: E) -> bool) {
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when size_of(E) != 0 {
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if n := len(data); n > 1 {
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_quick_sort_less(data, 0, n, _max_depth(n), less);
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}
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}
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}
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sort_by_cmp :: proc(data: $T/[]$E, cmp: proc(i, j: E) -> Ordering) {
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when size_of(E) != 0 {
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if n := len(data); n > 1 {
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_quick_sort_cmp(data, 0, n, _max_depth(n), cmp);
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}
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}
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}
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is_sorted :: proc(array: $T/[]$E) -> bool where ORD(E) {
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for i := len(array)-1; i > 0; i -= 1 {
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if array[i] < array[i-1] {
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return false;
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}
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}
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return true;
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}
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is_sorted_by :: proc(array: $T/[]$E, less: proc(i, j: E) -> bool) -> bool {
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for i := len(array)-1; i > 0; i -= 1 {
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if less(array[i], array[i-1]) {
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return false;
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}
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}
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return true;
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}
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is_sorted_cmp :: proc(array: $T/[]$E, cmp: proc(i, j: E) -> Ordering) -> bool {
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for i := len(array)-1; i > 0; i -= 1 {
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if cmp(array[i], array[i-1]) == .Equal {
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return false;
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}
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}
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return true;
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}
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reverse_sort :: proc(data: $T/[]$E) where ORD(E) {
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sort_by(data, proc(i, j: E) -> bool {
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return j < i;
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});
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}
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reverse_sort_by :: proc(data: $T/[]$E, less: proc(i, j: E) -> bool) where ORD(E) {
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context._internal = rawptr(less);
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sort_by(data, proc(i, j: E) -> bool {
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k := (proc(i, j: E) -> bool)(context._internal);
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return k(j, i);
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});
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}
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reverse_sort_by_cmp :: proc(data: $T/[]$E, cmp: proc(i, j: E) -> Ordering) where ORD(E) {
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context._internal = rawptr(cmp);
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sort_by_cmp(data, proc(i, j: E) -> Ordering {
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k := (proc(i, j: E) -> Ordering)(context._internal);
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return k(j, i);
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});
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}
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// TODO(bill): Should `sort_by_key` exist or is `sort_by` more than enough?
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sort_by_key :: proc(data: $T/[]$E, key: proc(E) -> $K) where ORD(K) {
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context._internal = rawptr(key);
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sort_by(data, proc(i, j: E) -> bool {
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k := (proc(E) -> K)(context._internal);
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return k(i) < k(j);
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});
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}
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reverse_sort_by_key :: proc(data: $T/[]$E, key: proc(E) -> $K) where ORD(K) {
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context._internal = rawptr(key);
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sort_by(data, proc(i, j: E) -> bool {
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k := (proc(E) -> K)(context._internal);
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return k(j) < k(i);
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});
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}
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is_sorted_by_key :: proc(array: $T/[]$E, key: proc(E) -> $K) -> bool where ORD(K) {
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for i := len(array)-1; i > 0; i -= 1 {
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if key(array[i]) < key(array[i-1]) {
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return false;
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}
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}
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return true;
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}
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@(private)
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_max_depth :: proc(n: int) -> int { // 2*ceil(log2(n+1))
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depth: int;
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for i := n; i > 0; i >>= 1 {
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depth += 1;
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}
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return depth * 2;
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}
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@(private)
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_quick_sort :: proc(data: $T/[]$E, a, b, max_depth: int) where ORD(E) {
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median3 :: proc(data: T, m1, m0, m2: int) {
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if data[m1] < data[m0] {
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swap(data, m1, m0);
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}
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if data[m2] < data[m1] {
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swap(data, m2, m1);
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if data[m1] < data[m0] {
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swap(data, m1, m0);
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}
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}
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}
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do_pivot :: proc(data: T, lo, hi: int) -> (midlo, midhi: int) {
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m := int(uint(lo+hi)>>1);
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if hi-lo > 40 {
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s := (hi-lo)/8;
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median3(data, lo, lo+s, lo+s*2);
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median3(data, m, m-s, m+s);
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median3(data, hi-1, hi-1-s, hi-1-s*2);
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}
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median3(data, lo, m, hi-1);
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pivot := lo;
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a, c := lo+1, hi-1;
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for ; a < c && data[a] < data[pivot]; a += 1 {
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}
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b := a;
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for {
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for ; b < c && !(data[pivot] < data[b]); b += 1 { // data[b] <= pivot
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}
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for ; b < c && data[pivot] < data[c-1]; c -=1 { // data[c-1] > pivot
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}
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if b >= c {
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break;
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}
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swap(data, b, c-1);
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b += 1;
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c -= 1;
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}
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protect := hi-c < 5;
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if !protect && hi-c < (hi-lo)/4 {
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dups := 0;
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if !(data[pivot] < data[hi-1]) {
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swap(data, c, hi-1);
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c += 1;
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dups += 1;
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}
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if !(data[b-1] < data[pivot]) {
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b -= 1;
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dups += 1;
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}
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if !(data[m] < data[pivot]) {
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swap(data, m, b-1);
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b -= 1;
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dups += 1;
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}
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protect = dups > 1;
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}
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if protect {
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for {
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for ; a < b && !(data[b-1] < data[pivot]); b -= 1 {
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}
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for ; a < b && data[a] < data[pivot]; a += 1 {
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}
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if a >= b {
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break;
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}
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swap(data, a, b-1);
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a += 1;
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b -= 1;
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}
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}
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swap(data, pivot, b-1);
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return b-1, c;
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}
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a, b, max_depth := a, b, max_depth;
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if b-a > 12 { // only use shell sort for lengths <= 12
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if max_depth == 0 {
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_heap_sort(data, a, b);
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return;
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}
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max_depth -= 1;
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mlo, mhi := do_pivot(data, a, b);
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if mlo-a < b-mhi {
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_quick_sort(data, a, mlo, max_depth);
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a = mhi;
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} else {
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_quick_sort(data, mhi, b, max_depth);
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b = mlo;
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}
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}
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if b-a > 1 {
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// Shell short with gap 6
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for i in a+6..<b {
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if data[i] < data[i-6] {
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swap(data, i, i-6);
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}
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}
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_insertion_sort(data, a, b);
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}
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}
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@(private)
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_insertion_sort :: proc(data: $T/[]$E, a, b: int) where ORD(E) {
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for i in a+1..<b {
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for j := i; j > a && data[j] < data[j-1]; j -= 1 {
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swap(data, j, j-1);
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}
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}
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}
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@(private)
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_heap_sort :: proc(data: $T/[]$E, a, b: int) where ORD(E) {
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sift_down :: proc(data: T, lo, hi, first: int) {
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root := lo;
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for {
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child := 2*root + 1;
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if child >= hi {
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break;
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}
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if child+1 < hi && data[first+child] < data[first+child+1] {
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child += 1;
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}
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if !(data[first+root] < data[first+child]) {
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return;
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}
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swap(data, first+root, first+child);
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root = child;
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}
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}
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first, lo, hi := a, 0, b-a;
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for i := (hi-1)/2; i >= 0; i -= 1 {
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sift_down(data, i, hi, first);
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}
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for i := hi-1; i >= 0; i -= 1 {
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swap(data, first, first+i);
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sift_down(data, lo, i, first);
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}
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}
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@(private)
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_quick_sort_less :: proc(data: $T/[]$E, a, b, max_depth: int, less: proc(i, j: E) -> bool) {
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median3 :: proc(data: T, m1, m0, m2: int, less: proc(i, j: E) -> bool) {
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if less(data[m1], data[m0]) {
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swap(data, m1, m0);
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}
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if less(data[m2], data[m1]) {
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swap(data, m2, m1);
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if less(data[m1], data[m0]) {
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swap(data, m1, m0);
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}
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}
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}
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do_pivot :: proc(data: T, lo, hi: int, less: proc(i, j: E) -> bool) -> (midlo, midhi: int) {
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m := int(uint(lo+hi)>>1);
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if hi-lo > 40 {
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s := (hi-lo)/8;
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median3(data, lo, lo+s, lo+s*2, less);
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median3(data, m, m-s, m+s, less);
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median3(data, hi-1, hi-1-s, hi-1-s*2, less);
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}
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median3(data, lo, m, hi-1, less);
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pivot := lo;
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a, c := lo+1, hi-1;
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for ; a < c && less(data[a], data[pivot]); a += 1 {
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}
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b := a;
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for {
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for ; b < c && !less(data[pivot], data[b]); b += 1 { // data[b] <= pivot
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}
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for ; b < c && less(data[pivot], data[c-1]); c -=1 { // data[c-1] > pivot
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}
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if b >= c {
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break;
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}
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swap(data, b, c-1);
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b += 1;
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c -= 1;
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}
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protect := hi-c < 5;
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if !protect && hi-c < (hi-lo)/4 {
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dups := 0;
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if !less(data[pivot], data[hi-1]) {
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swap(data, c, hi-1);
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c += 1;
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dups += 1;
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}
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if !less(data[b-1], data[pivot]) {
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b -= 1;
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dups += 1;
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}
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if !less(data[m], data[pivot]) {
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swap(data, m, b-1);
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b -= 1;
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dups += 1;
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}
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protect = dups > 1;
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}
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if protect {
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for {
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for ; a < b && !less(data[b-1], data[pivot]); b -= 1 {
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}
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for ; a < b && less(data[a], data[pivot]); a += 1 {
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}
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if a >= b {
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break;
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}
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swap(data, a, b-1);
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a += 1;
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b -= 1;
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}
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}
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swap(data, pivot, b-1);
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return b-1, c;
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}
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a, b, max_depth := a, b, max_depth;
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if b-a > 12 { // only use shell sort for lengths <= 12
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if max_depth == 0 {
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_heap_sort_less(data, a, b, less);
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return;
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}
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max_depth -= 1;
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mlo, mhi := do_pivot(data, a, b, less);
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if mlo-a < b-mhi {
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_quick_sort_less(data, a, mlo, max_depth, less);
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a = mhi;
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} else {
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_quick_sort_less(data, mhi, b, max_depth, less);
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b = mlo;
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}
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}
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if b-a > 1 {
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// Shell short with gap 6
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for i in a+6..<b {
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if less(data[i], data[i-6]) {
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swap(data, i, i-6);
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}
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}
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_insertion_sort_less(data, a, b, less);
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}
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}
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@(private)
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_insertion_sort_less :: proc(data: $T/[]$E, a, b: int, less: proc(i, j: E) -> bool) {
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for i in a+1..<b {
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for j := i; j > a && less(data[j], data[j-1]); j -= 1 {
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swap(data, j, j-1);
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}
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}
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}
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@(private)
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_heap_sort_less :: proc(data: $T/[]$E, a, b: int, less: proc(i, j: E) -> bool) {
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sift_down :: proc(data: T, lo, hi, first: int, less: proc(i, j: E) -> bool) {
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root := lo;
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for {
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child := 2*root + 1;
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if child >= hi {
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break;
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}
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if child+1 < hi && less(data[first+child], data[first+child+1]) {
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child += 1;
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}
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if !less(data[first+root], data[first+child]) {
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return;
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}
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swap(data, first+root, first+child);
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root = child;
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}
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}
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first, lo, hi := a, 0, b-a;
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for i := (hi-1)/2; i >= 0; i -= 1 {
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sift_down(data, i, hi, first, less);
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}
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for i := hi-1; i >= 0; i -= 1 {
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swap(data, first, first+i);
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sift_down(data, lo, i, first, less);
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}
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}
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@(private)
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_quick_sort_cmp :: proc(data: $T/[]$E, a, b, max_depth: int, cmp: proc(i, j: E) -> Ordering) {
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median3 :: proc(data: T, m1, m0, m2: int, cmp: proc(i, j: E) -> Ordering) {
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if cmp(data[m1], data[m0]) == .Less {
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swap(data, m1, m0);
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}
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if cmp(data[m2], data[m1]) == .Less {
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swap(data, m2, m1);
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if cmp(data[m1], data[m0]) == .Less {
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swap(data, m1, m0);
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}
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}
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}
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do_pivot :: proc(data: T, lo, hi: int, cmp: proc(i, j: E) -> Ordering) -> (midlo, midhi: int) {
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m := int(uint(lo+hi)>>1);
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if hi-lo > 40 {
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s := (hi-lo)/8;
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median3(data, lo, lo+s, lo+s*2, cmp);
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median3(data, m, m-s, m+s, cmp);
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median3(data, hi-1, hi-1-s, hi-1-s*2, cmp);
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}
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median3(data, lo, m, hi-1, cmp);
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pivot := lo;
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a, c := lo+1, hi-1;
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for ; a < c && cmp(data[a], data[pivot]) == .Less; a += 1 {
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}
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b := a;
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for {
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for ; b < c && cmp(data[pivot], data[b]) >= .Equal; b += 1 { // data[b] <= pivot
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}
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for ; b < c && cmp(data[pivot], data[c-1]) == .Less; c -=1 { // data[c-1] > pivot
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}
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if b >= c {
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break;
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}
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swap(data, b, c-1);
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b += 1;
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c -= 1;
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}
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protect := hi-c < 5;
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if !protect && hi-c < (hi-lo)/4 {
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dups := 0;
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if cmp(data[pivot], data[hi-1]) != .Less {
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swap(data, c, hi-1);
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c += 1;
|
|
dups += 1;
|
|
}
|
|
if cmp(data[b-1], data[pivot]) != .Less {
|
|
b -= 1;
|
|
dups += 1;
|
|
}
|
|
|
|
if cmp(data[m], data[pivot]) != .Less {
|
|
swap(data, m, b-1);
|
|
b -= 1;
|
|
dups += 1;
|
|
}
|
|
protect = dups > 1;
|
|
}
|
|
if protect {
|
|
for {
|
|
for ; a < b && cmp(data[b-1], data[pivot]) >= .Equal; b -= 1 {
|
|
}
|
|
for ; a < b && cmp(data[a], data[pivot]) == .Less; a += 1 {
|
|
}
|
|
if a >= b {
|
|
break;
|
|
}
|
|
swap(data, a, b-1);
|
|
a += 1;
|
|
b -= 1;
|
|
}
|
|
}
|
|
swap(data, pivot, b-1);
|
|
return b-1, c;
|
|
}
|
|
|
|
|
|
a, b, max_depth := a, b, max_depth;
|
|
|
|
if b-a > 12 { // only use shell sort for lengths <= 12
|
|
if max_depth == 0 {
|
|
_heap_sort_cmp(data, a, b, cmp);
|
|
return;
|
|
}
|
|
max_depth -= 1;
|
|
mlo, mhi := do_pivot(data, a, b, cmp);
|
|
if mlo-a < b-mhi {
|
|
_quick_sort_cmp(data, a, mlo, max_depth, cmp);
|
|
a = mhi;
|
|
} else {
|
|
_quick_sort_cmp(data, mhi, b, max_depth, cmp);
|
|
b = mlo;
|
|
}
|
|
}
|
|
if b-a > 1 {
|
|
// Shell short with gap 6
|
|
for i in a+6..<b {
|
|
if cmp(data[i], data[i-6]) == .Less {
|
|
swap(data, i, i-6);
|
|
}
|
|
}
|
|
_insertion_sort_cmp(data, a, b, cmp);
|
|
}
|
|
}
|
|
|
|
@(private)
|
|
_insertion_sort_cmp :: proc(data: $T/[]$E, a, b: int, cmp: proc(i, j: E) -> Ordering) {
|
|
for i in a+1..<b {
|
|
for j := i; j > a && cmp(data[j], data[j-1]) == .Less; j -= 1 {
|
|
swap(data, j, j-1);
|
|
}
|
|
}
|
|
}
|
|
|
|
@(private)
|
|
_heap_sort_cmp :: proc(data: $T/[]$E, a, b: int, cmp: proc(i, j: E) -> Ordering) {
|
|
sift_down :: proc(data: T, lo, hi, first: int, cmp: proc(i, j: E) -> Ordering) {
|
|
root := lo;
|
|
for {
|
|
child := 2*root + 1;
|
|
if child >= hi {
|
|
break;
|
|
}
|
|
if child+1 < hi && cmp(data[first+child], data[first+child+1]) == .Less {
|
|
child += 1;
|
|
}
|
|
if cmp(data[first+root], data[first+child]) >= .Equal {
|
|
return;
|
|
}
|
|
swap(data, first+root, first+child);
|
|
root = child;
|
|
}
|
|
}
|
|
|
|
|
|
first, lo, hi := a, 0, b-a;
|
|
|
|
for i := (hi-1)/2; i >= 0; i -= 1 {
|
|
sift_down(data, i, hi, first, cmp);
|
|
}
|
|
|
|
for i := hi-1; i >= 0; i -= 1 {
|
|
swap(data, first, first+i);
|
|
sift_down(data, lo, i, first, cmp);
|
|
}
|
|
}
|
|
|
|
|
|
|