common/layer_stack.c

   1 #include <stdint.h>
   2 #include "keyboard.h"
   3 #include "layer_stack.h"
   4 #include "debug.h"
   5
   6
   7 static uint8_t top_layer = 0;
   8
   9 /* [0] always works as sentinel and not used for store.*/
  10 static layer_item_t layer_stack[LAYER_STACK_SIZE] = {};
  11
  12 bool layer_stack_push(uint8_t layer)
  13 {
  14     for (uint8_t i = 1; i < LAYER_STACK_SIZE; i++) {
  15         if (!layer_stack[i].used) {
  16             layer_stack[i] = (layer_item_t){ .layer = layer,
  17                                               .next = top_layer,
  18                                               .used = true };
  19             top_layer = i;
  20             return true;
  21         }
  22     }
  23     return false;
  24 }
  25
  26 bool layer_stack_pop(void)
  27 {
  28     if (layer_stack[top_layer].used) {
  29         uint8_t popped = top_layer;
  30         top_layer = layer_stack[popped].next;
  31         layer_stack[popped] = (layer_item_t){};
  32         return true;
  33     }
  34     return false;
  35 }
  36
  37 bool layer_stack_remove(uint8_t layer)
  38 {
  39     if (layer_stack[top_layer].used && layer_stack[top_layer].layer == layer) {
  40         layer_stack_pop();
  41         debug("layer_stack_remove: top_layer\n");
  42         return true;
  43     }
  44
  45     for (uint8_t i = top_layer; layer_stack[i].used; i = layer_stack[i].next) {
  46         debug("layer_stack_remove: ["); debug_dec(i); debug("]");
  47         debug_dec(layer_stack[i].layer); debug("\n");
  48         uint8_t removed = layer_stack[i].next;
  49         if (layer_stack[removed].used && layer_stack[removed].layer == layer) {
  50             layer_stack[i].next = layer_stack[removed].next;
  51             layer_stack[removed] = (layer_item_t){};
  52             debug("layer_stack_remove: removed.\n");
  53             return true;
  54         }
  55     }
  56     return false;
  57 }
  58
  59 bool layer_stack_remove_then_push(uint8_t layer)
  60 {
  61     layer_stack_remove(layer);
  62     return layer_stack_push(layer);
  63 }
  64
  65 bool layer_stack_remove_or_push(uint8_t layer)
  66 {
  67     return (layer_stack_remove(layer)) || layer_stack_push(layer);
  68 }
  69
  70 void layer_stack_debug(void)
  71 {
  72     debug("layer_stack: ");
  73     layer_item_t item = layer_stack[top_layer];
  74     while (item.used) {
  75         debug_dec(item.layer);
  76         debug("["); debug_dec(item.next); debug("]");
  77         item = layer_stack[item.next];
  78     }
  79     debug("\n");
  80 }
  81
  82
  83
  84 action_t layer_stack_get_action(key_t key)
  85 {
  86     action_t action;
  87     action.code = ACTION_TRANSPARENT;
  88
  89     /* layer stack */
  90     for (layer_item_t i = layer_stack[top_layer]; i.used; i = layer_stack[i.next]) {
  91         action = action_for_key(i.layer, key);
  92         if (action.code != ACTION_TRANSPARENT) {
  93             layer_stack_debug();
  94             debug("layer_stack: used. "); debug_dec(i.layer); debug("\n");
  95             return action;
  96         }
  97         debug("layer_stack: through. "); debug_dec(i.layer); debug("\n");
  98     }
  99     return action;
 100 }