Add package slice; New sort.Interface with default sort.sort

This commit is contained in:
gingerBill
2020-10-14 19:52:05 +01:00
parent de13584be2
commit edd802e1ff
4 changed files with 997 additions and 1 deletions
+72
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package slice
import "core:mem"
ptr_add :: proc(p: $P/^$T, x: int) -> ^T {
return (^T)(uintptr(p) + size_of(T)*x);
}
ptr_sub :: proc(p: $P/^$T, x: int) -> ^T {
return inline ptr_add(p, -x);
}
ptr_swap_non_overlapping :: proc(x, y: rawptr, len: int) {
if len <= 0 {
return;
}
if x == y { // Ignore pointers that are the same
return;
}
Block :: distinct [4]u64;
BLOCK_SIZE :: size_of(Block);
i := 0;
t := &Block{};
for ; i + BLOCK_SIZE <= len; i += BLOCK_SIZE {
a := rawptr(uintptr(x) + uintptr(i));
b := rawptr(uintptr(y) + uintptr(i));
mem.copy(t, a, BLOCK_SIZE);
mem.copy(a, b, BLOCK_SIZE);
mem.copy(b, t, BLOCK_SIZE);
}
if i < len {
rem := len - i;
a := rawptr(uintptr(x) + uintptr(i));
b := rawptr(uintptr(y) + uintptr(i));
mem.copy(t, a, rem);
mem.copy(a, b, rem);
mem.copy(b, t, rem);
}
}
ptr_rotate :: proc(left: int, mid: ^$T, right: int) {
when size_of(T) != 0 {
left, mid, right := left, mid, right;
// TODO(bill): Optimization with a buffer for smaller ranges
if left >= right {
for {
ptr_swap_non_overlapping(ptr_sub(mid, right), mid, right);
mid = ptr_sub(mid, right);
left -= right;
if left < right {
break;
}
}
} else {
ptr_swap_non_overlapping(ptr_sub(mid, left), mid, left);
mid = ptr_add(mid, left);
right -= left;
if right < left {
break;
}
}
}
}
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package slice
import "intrinsics"
import "core:math/bits"
import "core:mem"
_ :: intrinsics;
_ :: bits;
_ :: mem;
swap :: proc(array: $T/[]$E, a, b: int, loc := #caller_location) {
when size_of(E) > 8 {
ptr_swap_non_overlapping(&array[a], &array[b], size_of(E));
} else {
array[a], array[b] = array[b], array[a];
}
}
reverse :: proc(array: $T/[]$E) {
n := len(array)/2;
for i in 0..<n {
a, b := i, len(array)-i-1;
array[a], array[b] = array[b], array[a];
}
}
contains :: proc(array: $T/[]$E, value: E) -> bool where intrinsics.type_is_comparable(E) {
_, found := linear_search(array, value);
return found;
}
linear_search :: proc(array: $A/[]$T, key: T) -> (index: int, found: bool)
where intrinsics.type_is_comparable(T) #no_bounds_check {
for x, i in array {
if x == key {
return i, true;
}
}
return -1, false;
}
binary_search :: proc(array: $A/[]$T, key: T) -> (index: int, found: bool)
where intrinsics.type_is_ordered(T) #no_bounds_check {
n := len(array);
switch n {
case 0:
return -1, false;
case 1:
if array[0] == key {
return 0, true;
}
return -1, false;
}
lo, hi := 0, n-1;
for array[hi] != array[lo] && key >= array[lo] && key <= array[hi] {
when intrinsics.type_is_ordered_numeric(T) {
// NOTE(bill): This is technically interpolation search
m := lo + int((key - array[lo]) * T(hi - lo) / (array[hi] - array[lo]));
} else {
m := (lo + hi)/2;
}
switch {
case array[m] < key:
lo = m + 1;
case key < array[m]:
hi = m - 1;
case:
return m, true;
}
}
if key == array[lo] {
return lo, true;
}
return -1, false;
}
equal :: proc(a, b: $T/[]$E) -> bool where intrinsics.type_is_comparable(E) {
if len(a) != len(b) {
return false;
}
when intrinsics.type_is_simple_compare(E) {
return mem.compare_ptrs(raw_data(a), raw_data(b), len(a)*size_of(E)) == 0;
} else {
for i in 0..<len(a) {
if a[i] != b[i] {
return false;
}
}
return true;
}
}
simple_equal :: proc(a, b: $T/[]$E) -> bool where intrinsics.type_is_simple_compare(E) {
if len(a) != len(b) {
return false;
}
return mem.compare_ptrs(raw_data(a), raw_data(b), len(a)*size_of(E)) == 0;
}
has_prefix :: proc(array: $T/[]$E, needle: T) -> bool where intrinsics.type_is_comparable(E) {
n := len(needle);
if len(array) >= n {
return equal(array[:n], needle);
}
return false;
}
has_suffix :: proc(array: $T/[]$E, needle: T) -> bool where intrinsics.type_is_comparable(E) {
array := array;
m, n := len(array), len(needle);
if m >= n {
return equal(array[m-n:], needle);
}
return false;
}
fill :: proc(array: $T/[]$E, value: T) {
for _, i in array {
array[i] = value;
}
}
rotate_left :: proc(array: $T/[]$E, k: int) {
n := len(array);
m := mid %% n;
k := n - m;
p := raw_data(array);
ptr_rotate(mid, ptr_add(p, mid), k);
}
rotate_right :: proc(array: $T/[]$E, k: int) {
rotate_left(array, -k);
}
swap_with_slice :: proc(a, b: $T/[]$E, loc := #caller_location) {
assert(len(a) == len(b), "miss matching slice lengths", loc);
ptr_swap_non_overlapping(raw_data(a), raw_data(b), len(a)*size_of(E));
}
concatenate :: proc(a: []$T/[]$E, allocator := context.allocator) -> (res: T) {
if len(a) == 0 {
return;
}
n := 0;
for s in a {
n += len(s);
}
res = make(T, n, allocator);
i := 0;
for s in a {
i += copy(b[i:], s);
}
return;
}
// copies slice into a new dynamic array
clone :: proc(a: $T/[]$E, allocator := context.allocator) -> []E {
d := make([]E, len(a), allocator);
copy(d[:], a);
return d;
}
// copies slice into a new dynamic array
to_dynamic :: proc(a: $T/[]$E, allocator := context.allocator) -> [dynamic]E {
d := make([dynamic]E, len(a), allocator);
copy(d[:], a);
return d;
}
// Converts slice into a dynamic array without cloning or allocating memory
into_dynamic :: proc(a: $T/[]$E) -> [dynamic]E {
s := transmute(mem.Raw_Slice)a;
d := mem.Raw_Dynamic_Array{
data = s.data,
len = 0,
cap = s.len,
allocator = mem.nil_allocator(),
};
return transmute([dynamic]E)d;
}
length :: proc(a: $T/[]$E) -> int {
return len(a);
}
is_empty :: proc(a: $T/[]$E) -> bool {
return len(a) == 0;
}
split_at :: proc(array: $T/[]$E, index: int) -> (a, b: T) {
return array[:index], array[index:];
}
split_first :: proc(array: $T/[]$E) -> (first: E, rest: T) {
return array[0], array[1:];
}
split_last :: proc(array: $T/[]$E) -> (rest: T, last: E) {
n := len(array)-1;
return array[:n], array[n];
}
first :: proc(array: $T/[]$E) -> E {
return array[0];
}
last :: proc(array: $T/[]$E) -> ^E {
return array[len(array)-1];
}
first_ptr :: proc(array: $T/[]$E) -> ^E {
if len(array) != 0 {
return &array[0];
}
return nil;
}
last_ptr :: proc(array: $T/[]$E) -> ^E {
if len(array) != 0 {
return &array[len(array)-1];
}
return nil;
}
get :: proc(array: $T/[]$E, index: int) -> (value: E, ok: bool) {
if 0 <= index && index < len(array) {
value = array[index];
ok = true;
}
return;
}
get_ptr :: proc(array: $T/[]$E, index: int) -> (value: ^E, ok: bool) {
if 0 <= index && index < len(array) {
value = &array[index];
ok = true;
}
return;
}
as_ptr :: proc(array: $T/[]$E) -> ^E {
return raw_data(array);
}
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package slice
import "intrinsics"
_ :: intrinsics;
ORD :: intrinsics.type_is_ordered;
// sort sorts a slice
// This sort is not guaranteed to be stable
sort :: proc(data: $T/[]$E) where ORD(E) {
when size_of(E) != 0 {
if n := len(data); n > 1 {
_quick_sort(data, 0, n, _max_depth(n));
}
}
}
// sort_proc sorts a slice with a given procedure to test whether two values are ordered "i < j"
// This sort is not guaranteed to be stable
sort_proc :: proc(data: $T/[]$E, less: proc(i, j: E) -> bool) {
when size_of(E) != 0 {
if n := len(data); n > 1 {
_quick_sort_proc(data, 0, n, _max_depth(n), less);
}
}
}
reverse_sort :: proc(data: $T/[]$E) where ORD(E) {
sort_proc(data, proc(i, j: E) -> bool {
return j < i;
});
}
is_sorted :: proc(array: $T/[]$E) -> bool where ORD(E) {
for i := len(array)-1; i > 0; i -= 1 {
if array[i] < array[i-1] {
return false;
}
}
return true;
}
is_sorted_proc :: proc(array: $T/[]$E, less: proc(i, j: E) -> bool) -> bool {
for i := len(array)-1; i > 0; i -= 1 {
if less(array[i], array[i-1]) {
return false;
}
}
return true;
}
@(private)
_max_depth :: proc(n: int) -> int { // 2*ceil(log2(n+1))
depth: int;
for i := n; i > 0; i >>= 1 {
depth += 1;
}
return depth * 2;
}
@(private)
_quick_sort :: proc(data: $T/[]$E, a, b, max_depth: int) where ORD(E) {
median3 :: proc(data: T, m1, m0, m2: int) {
if data[m1] < data[m0] {
swap(data, m1, m0);
}
if data[m2] < data[m1] {
swap(data, m2, m1);
if data[m1] < data[m0] {
swap(data, m1, m0);
}
}
}
do_pivot :: proc(data: T, lo, hi: int) -> (midlo, midhi: int) {
m := int(uint(lo+hi)>>1);
if hi-lo > 40 {
s := (hi-lo)/8;
median3(data, lo, lo+s, lo+s*2);
median3(data, m, m-s, m+s);
median3(data, hi-1, hi-1-s, hi-1-s*2);
}
median3(data, lo, m, hi-1);
pivot := lo;
a, c := lo+1, hi-1;
for ; a < c && data[a] < data[pivot]; a += 1 {
}
b := a;
for {
for ; b < c && !(data[pivot] < data[b]); b += 1 { // data[b] <= pivot
}
for ; b < c && data[pivot] < data[c-1]; c -=1 { // data[c-1] > pivot
}
if b >= c {
break;
}
swap(data, b, c-1);
b += 1;
c -= 1;
}
protect := hi-c < 5;
if !protect && hi-c < (hi-lo)/4 {
dups := 0;
if !(data[pivot] < data[hi-1]) {
swap(data, c, hi-1);
c += 1;
dups += 1;
}
if !(data[b-1] < data[pivot]) {
b -= 1;
dups += 1;
}
if !(data[m] < data[pivot]) {
swap(data, m, b-1);
b -= 1;
dups += 1;
}
protect = dups > 1;
}
if protect {
for {
for ; a < b && !(data[b-1] < data[pivot]); b -= 1 {
}
for ; a < b && data[a] < data[pivot]; 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(data, a, b);
return;
}
max_depth -= 1;
mlo, mhi := do_pivot(data, a, b);
if mlo-a < b-mhi {
_quick_sort(data, a, mlo, max_depth);
a = mhi;
} else {
_quick_sort(data, mhi, b, max_depth);
b = mlo;
}
}
if b-a > 1 {
// Shell short with gap 6
for i in a+6..<b {
if data[i] < data[i-6] {
swap(data, i, i-6);
}
}
_insertion_sort(data, a, b);
}
}
@(private)
_insertion_sort :: proc(data: $T/[]$E, a, b: int) where ORD(E) {
for i in a+1..<b {
for j := i; j > a && data[j] < data[j-1]; j -= 1 {
swap(data, j, j-1);
}
}
}
@(private)
_heap_sort :: proc(data: $T/[]$E, a, b: int) where ORD(E) {
sift_down :: proc(data: T, lo, hi, first: int) {
root := lo;
for {
child := 2*root + 1;
if child >= hi {
break;
}
if child+1 < hi && data[first+child] < data[first+child+1] {
child += 1;
}
if !(data[first+root] < data[first+child]) {
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);
}
for i := hi-1; i >= 0; i -= 1 {
swap(data, first, first+i);
sift_down(data, lo, i, first);
}
}
@(private)
_quick_sort_proc :: proc(data: $T/[]$E, a, b, max_depth: int, less: proc(i, j: E) -> bool) {
median3 :: proc(data: T, m1, m0, m2: int, less: proc(i, j: E) -> bool) {
if less(data[m1], data[m0]) {
swap(data, m1, m0);
}
if less(data[m2], data[m1]) {
swap(data, m2, m1);
if less(data[m1], data[m0]) {
swap(data, m1, m0);
}
}
}
do_pivot :: proc(data: T, lo, hi: int, less: proc(i, j: E) -> bool) -> (midlo, midhi: int) {
m := int(uint(lo+hi)>>1);
if hi-lo > 40 {
s := (hi-lo)/8;
median3(data, lo, lo+s, lo+s*2, less);
median3(data, m, m-s, m+s, less);
median3(data, hi-1, hi-1-s, hi-1-s*2, less);
}
median3(data, lo, m, hi-1, less);
pivot := lo;
a, c := lo+1, hi-1;
for ; a < c && less(data[a], data[pivot]); a += 1 {
}
b := a;
for {
for ; b < c && !less(data[pivot], data[b]); b += 1 { // data[b] <= pivot
}
for ; b < c && less(data[pivot], data[c-1]); c -=1 { // data[c-1] > pivot
}
if b >= c {
break;
}
swap(data, b, c-1);
b += 1;
c -= 1;
}
protect := hi-c < 5;
if !protect && hi-c < (hi-lo)/4 {
dups := 0;
if !less(data[pivot], data[hi-1]) {
swap(data, c, hi-1);
c += 1;
dups += 1;
}
if !less(data[b-1], data[pivot]) {
b -= 1;
dups += 1;
}
if !less(data[m], data[pivot]) {
swap(data, m, b-1);
b -= 1;
dups += 1;
}
protect = dups > 1;
}
if protect {
for {
for ; a < b && !less(data[b-1], data[pivot]); b -= 1 {
}
for ; a < b && less(data[a], data[pivot]); 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_proc(data, a, b, less);
return;
}
max_depth -= 1;
mlo, mhi := do_pivot(data, a, b, less);
if mlo-a < b-mhi {
_quick_sort_proc(data, a, mlo, max_depth, less);
a = mhi;
} else {
_quick_sort_proc(data, mhi, b, max_depth, less);
b = mlo;
}
}
if b-a > 1 {
// Shell short with gap 6
for i in a+6..<b {
if less(data[i], data[i-6]) {
swap(data, i, i-6);
}
}
_insertion_sort_proc(data, a, b, less);
}
}
@(private)
_insertion_sort_proc :: proc(data: $T/[]$E, a, b: int, less: proc(i, j: E) -> bool) {
for i in a+1..<b {
for j := i; j > a && less(data[j], data[j-1]); j -= 1 {
swap(data, j, j-1);
}
}
}
@(private)
_heap_sort_proc :: proc(data: $T/[]$E, a, b: int, less: proc(i, j: E) -> bool) {
sift_down :: proc(data: T, lo, hi, first: int, less: proc(i, j: E) -> bool) {
root := lo;
for {
child := 2*root + 1;
if child >= hi {
break;
}
if child+1 < hi && less(data[first+child], data[first+child+1]) {
child += 1;
}
if !less(data[first+root], data[first+child]) {
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, less);
}
for i := hi-1; i >= 0; i -= 1 {
swap(data, first, first+i);
sift_down(data, lo, i, first, less);
}
}