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#include <stdint.h>
#include "keyboard.h"
#include "layer_stack.h"
#include "debug.h"
static uint8_t top_layer = 0;
/* [0] always works as sentinel and not used for store.*/
static layer_item_t layer_stack[LAYER_STACK_SIZE] = {};
void layer_stack_clear(void)
{
for (uint8_t i = 0; i < LAYER_STACK_SIZE; i++) {
layer_stack[i] = (layer_item_t){ .layer = 0,
.next = 0,
.used = false };
}
}
bool layer_stack_push(uint8_t layer)
{
for (uint8_t i = 1; i < LAYER_STACK_SIZE; i++) {
if (!layer_stack[i].used) {
layer_stack[i] = (layer_item_t){ .layer = layer,
.next = top_layer,
.used = true };
top_layer = i;
return true;
}
}
return false;
}
bool layer_stack_pop(void)
{
if (layer_stack[top_layer].used) {
uint8_t popped = top_layer;
top_layer = layer_stack[popped].next;
layer_stack[popped] = (layer_item_t){};
return true;
}
return false;
}
bool layer_stack_remove(uint8_t layer)
{
if (layer_stack[top_layer].used && layer_stack[top_layer].layer == layer) {
layer_stack_pop();
debug("layer_stack_remove: top_layer\n");
return true;
}
for (uint8_t i = top_layer; layer_stack[i].used; i = layer_stack[i].next) {
debug("layer_stack_remove: ["); debug_dec(i); debug("]");
debug_dec(layer_stack[i].layer); debug("\n");
uint8_t removed = layer_stack[i].next;
if (layer_stack[removed].used && layer_stack[removed].layer == layer) {
layer_stack[i].next = layer_stack[removed].next;
layer_stack[removed] = (layer_item_t){};
debug("layer_stack_remove: removed.\n");
return true;
}
}
return false;
}
bool layer_stack_remove_then_push(uint8_t layer)
{
layer_stack_remove(layer);
return layer_stack_push(layer);
}
bool layer_stack_remove_or_push(uint8_t layer)
{
return (layer_stack_remove(layer)) || layer_stack_push(layer);
}
void layer_stack_debug(void)
{
debug("layer_stack: ");
layer_item_t item = layer_stack[top_layer];
while (item.used) {
debug_dec(item.layer);
debug("["); debug_dec(item.next); debug("] ");
item = layer_stack[item.next];
}
debug("\n");
}
action_t layer_stack_get_action(key_t key)
{
action_t action;
action.code = ACTION_TRANSPARENT;
/* layer stack */
for (layer_item_t i = layer_stack[top_layer]; i.used; i = layer_stack[i.next]) {
action = action_for_key(i.layer, key);
if (action.code != ACTION_TRANSPARENT) {
layer_stack_debug();
debug("layer_stack: used. "); debug_dec(i.layer); debug("\n");
return action;
}
debug("layer_stack: through. "); debug_dec(i.layer); debug("\n");
}
return action;
}
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