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implement stable sort for lists

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also change sort_workspaces() to use it
This commit is contained in:
Zandr Martin 2016-06-02 15:48:14 -05:00
parent 09670fc1a7
commit 9ccc92705e
4 changed files with 64 additions and 5 deletions
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57
common/list.c
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@ -72,3 +72,60 @@ int list_seq_find(list_t *list, int compare(const void *item, const void *data),
}
return -1;
}
static void list_swap(list_t *list, int src, int dest) {
void *tmp = list->items[src];
list->items[src] = list->items[dest];
list->items[dest] = tmp;
}
static void list_rotate(list_t *list, int from, int to) {
void *tmp = list->items[to];
while (to > from) {
list->items[to] = list->items[to - 1];
to--;
}
list->items[from] = tmp;
}
static void list_inplace_merge(list_t *list, int left, int last, int mid, int compare(const void *a, const void *b)) {
int right = mid + 1;
if (compare(&list->items[mid], &list->items[right]) <= 0) {
return;
}
while (left <= mid && right <= last) {
if (compare(&list->items[left], &list->items[right]) <= 0) {
left++;
} else {
list_rotate(list, left, right);
left++;
mid++;
right++;
}
}
}
static void list_inplace_sort(list_t *list, int first, int last, int compare(const void *a, const void *b)) {
if (first >= last) {
return;
} else if ((last - first) == 1) {
if (compare(&list->items[first], &list->items[last]) > 0) {
list_swap(list, first, last);
}
} else {
int mid = (int)((last + first) / 2);
list_inplace_sort(list, first, mid, compare);
list_inplace_sort(list, mid + 1, last, compare);
list_inplace_merge(list, first, last, mid, compare);
}
}
void list_stable_sort(list_t *list, int compare(const void *a, const void *b)) {
if (list->length > 1) {
list_inplace_sort(list, 0, list->length - 1, compare);
}
}

3
include/list.h
View file

@ -20,5 +20,6 @@ void list_qsort(list_t *list, int compare(const void *left, const void *right));
// Return index for first item in list that returns 0 for given compare
// function or -1 if none matches.
int list_seq_find(list_t *list, int compare(const void *item, const void *cmp_to), const void *cmp_to);
// stable sort since qsort is not guaranteed to be stable
void list_stable_sort(list_t *list, int compare(const void *a, const void *b));
#endif

2
include/output.h
View file

@ -16,7 +16,7 @@ void get_absolute_position(swayc_t *container, struct wlc_point *point);
// given wlc_point.
void get_absolute_center_position(swayc_t *container, struct wlc_point *point);
int sort_workspace_cmp_qsort(const void *a, const void *b);
// stable sort workspaces on this output
void sort_workspaces(swayc_t *output);
#endif

5
sway/output.c
View file

@ -3,6 +3,7 @@
#include <stdlib.h>
#include "output.h"
#include "log.h"
#include "list.h"
swayc_t *output_by_name(const char* name, const struct wlc_point *abs_pos) {
if (strcasecmp(name, "left") == 0) {
@ -180,7 +181,7 @@ void get_absolute_center_position(swayc_t *container, struct wlc_point *point) {
point->y += container->height/2;
}
int sort_workspace_cmp_qsort(const void *_a, const void *_b) {
static int sort_workspace_cmp_qsort(const void *_a, const void *_b) {
swayc_t *a = *(void **)_a;
swayc_t *b = *(void **)_b;
int retval = 0;
@ -199,5 +200,5 @@ int sort_workspace_cmp_qsort(const void *_a, const void *_b) {
}
void sort_workspaces(swayc_t *output) {
list_qsort(output->children, sort_workspace_cmp_qsort);
list_stable_sort(output->children, sort_workspace_cmp_qsort);
}