1 files changed, 138 insertions, 0 deletions
diff --git a/tmk_core/common/action_layer.c b/tmk_core/common/action_layer.c
new file mode 100644
index 0000000000..c535615f44
--- /dev/null
+++ b/tmk_core/common/action_layer.c
@@ -0,0 +1,138 @@
+#include <stdint.h>
+#include "keyboard.h"
+#include "action.h"
+#include "util.h"
+#include "action_layer.h"
+
+#ifdef DEBUG_ACTION
+#include "debug.h"
+#else
+#include "nodebug.h"
+#endif
+
+
+/* 
+ * Default Layer State
+ */
+uint32_t default_layer_state = 0;
+
+static void default_layer_state_set(uint32_t state)
+{
+    debug("default_layer_state: ");
+    default_layer_debug(); debug(" to ");
+    default_layer_state = state;
+    default_layer_debug(); debug("\n");
+    clear_keyboard_but_mods(); // To avoid stuck keys
+}
+
+void default_layer_debug(void)
+{
+    dprintf("%08lX(%u)", default_layer_state, biton32(default_layer_state));
+}
+
+void default_layer_set(uint32_t state)
+{
+    default_layer_state_set(state);
+}
+
+#ifndef NO_ACTION_LAYER
+void default_layer_or(uint32_t state)
+{
+    default_layer_state_set(default_layer_state | state);
+}
+void default_layer_and(uint32_t state)
+{
+    default_layer_state_set(default_layer_state & state);
+}
+void default_layer_xor(uint32_t state)
+{
+    default_layer_state_set(default_layer_state ^ state);
+}
+#endif
+
+
+#ifndef NO_ACTION_LAYER
+/* 
+ * Keymap Layer State
+ */
+uint32_t layer_state = 0;
+
+static void layer_state_set(uint32_t state)
+{
+    dprint("layer_state: ");
+    layer_debug(); dprint(" to ");
+    layer_state = state;
+    layer_debug(); dprintln();
+    clear_keyboard_but_mods(); // To avoid stuck keys
+}
+
+void layer_clear(void)
+{
+    layer_state_set(0);
+}
+
+void layer_move(uint8_t layer)
+{
+    layer_state_set(1UL<<layer);
+}
+
+void layer_on(uint8_t layer)
+{
+    layer_state_set(layer_state | (1UL<<layer));
+}
+
+void layer_off(uint8_t layer)
+{
+    layer_state_set(layer_state & ~(1UL<<layer));
+}
+
+void layer_invert(uint8_t layer)
+{
+    layer_state_set(layer_state ^ (1UL<<layer));
+}
+
+void layer_or(uint32_t state)
+{
+    layer_state_set(layer_state | state);
+}
+void layer_and(uint32_t state)
+{
+    layer_state_set(layer_state & state);
+}
+void layer_xor(uint32_t state)
+{
+    layer_state_set(layer_state ^ state);
+}
+
+void layer_debug(void)
+{
+    dprintf("%08lX(%u)", layer_state, biton32(layer_state));
+}
+#endif
+
+
+
+action_t layer_switch_get_action(keypos_t key)
+{
+    action_t action;
+    action.code = ACTION_TRANSPARENT;
+
+#ifndef NO_ACTION_LAYER
+    uint32_t layers = layer_state | default_layer_state;
+    /* check top layer first */
+    for (int8_t i = 31; i >= 0; i--) {
+        if (layers & (1UL<<i)) {
+            action = action_for_key(i, key);
+            if (action.code != ACTION_TRANSPARENT) {
+                return action;
+            }
+        }
+    }
+    /* fall back to layer 0 */
+    action = action_for_key(0, key);
+    return action;
+#else
+    action = action_for_key(biton32(default_layer_state), key);
+    return action;
+#endif
+}