common/action.c

   1 /*
   2 Copyright 2012,2013 Jun Wako <wakojun@gmail.com>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17 #include "host.h"
  18 #include "timer.h"
  19 #include "keymap.h"
  20 #include "keycode.h"
  21 #include "keyboard.h"
  22 #include "mousekey.h"
  23 #include "command.h"
  24 #include "util.h"
  25 #include "debug.h"
  26 #include "action.h"
  27
  28
  29 static void process_action(keyrecord_t *record);
  30 static bool process_tapping(keyrecord_t *record);
  31 static void waiting_buffer_scan_tap(void);
  32
  33 static void debug_event(keyevent_t event);
  34 static void debug_record(keyrecord_t record);
  35 static void debug_action(action_t action);
  36 static void debug_tapping_key(void);
  37 static void debug_waiting_buffer(void);
  38
  39
  40 /*
  41  * Tapping
  42  */
  43 /* period of tapping(ms) */
  44 #ifndef TAPPING_TERM
  45 #define TAPPING_TERM    200
  46 #endif
  47
  48 /* tap count needed for toggling a feature */
  49 #ifndef TAPPING_TOGGLE
  50 #define TAPPING_TOGGLE  5
  51 #endif
  52
  53 /* stores a key event of current tap. */
  54 static keyrecord_t tapping_key = {};
  55
  56 #define IS_TAPPING()            !IS_NOEVENT(tapping_key.event)
  57 #define IS_TAPPING_PRESSED()    (IS_TAPPING() && tapping_key.event.pressed)
  58 #define IS_TAPPING_RELEASED()   (IS_TAPPING() && !tapping_key.event.pressed)
  59 #define IS_TAPPING_KEY(k)       (IS_TAPPING() && KEYEQ(tapping_key.event.key, (k)))
  60 #define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < TAPPING_TERM)
  61
  62
  63 /*
  64  * Waiting buffer
  65  *
  66  * stores key events waiting for settling current tap.
  67  */
  68 #define WAITING_BUFFER_SIZE 8
  69 static keyrecord_t waiting_buffer[WAITING_BUFFER_SIZE] = {};
  70
  71 /* point to empty cell to enq */
  72 static uint8_t waiting_buffer_head = 0;
  73
  74 /* point to the oldest data cell to deq */
  75 static uint8_t waiting_buffer_tail = 0;
  76
  77 static bool waiting_buffer_enq(keyrecord_t record)
  78 {
  79     if (IS_NOEVENT(record.event)) {
  80         return true;
  81     }
  82
  83     if ((waiting_buffer_head + 1) % WAITING_BUFFER_SIZE == waiting_buffer_tail) {
  84         debug("waiting_buffer_enq: Over flow.\n");
  85         return false;
  86     }
  87
  88     waiting_buffer[waiting_buffer_head] = record;
  89     waiting_buffer_head = (waiting_buffer_head + 1) % WAITING_BUFFER_SIZE;
  90
  91     debug("waiting_buffer_enq: "); debug_waiting_buffer();
  92     return true;
  93 }
  94
  95 static void waiting_buffer_clear(void)
  96 {
  97     waiting_buffer_head = 0;
  98     waiting_buffer_tail = 0;
  99 }
 100
 101 #if TAPPING_TERM >= 500
 102 static bool waiting_buffer_typed(keyevent_t event)
 103 {
 104     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 105         if (KEYEQ(event.key, waiting_buffer[i].event.key) && event.pressed !=  waiting_buffer[i].event.pressed) {
 106             return true;
 107         }
 108     }
 109     return false;
 110 }
 111 #endif
 112
 113 bool waiting_buffer_has_anykey_pressed(void)
 114 {
 115     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 116         if (waiting_buffer[i].event.pressed) return true;
 117     }
 118     return false;
 119 }
 120
 121
 122 /* Oneshot modifier
 123  *
 124  * Problem: Want to capitalize like 'The' but the result tends to be 'THe'.
 125  * Solution: Oneshot modifier have its effect on only one key coming next.
 126  *           Tap Shift, then type 't', 'h' and 'e'. Not need to hold Shift key.
 127  *
 128  *  Hold:       works as normal modifier.
 129  *  Tap:        one shot modifier.
 130  *  2 Tap:      cancel one shot modifier.
 131  *  5-Tap:      toggles enable/disable oneshot feature.
 132  */
 133 static struct {
 134     uint8_t mods;
 135     uint8_t time;
 136     bool    ready;
 137     bool    disabled;
 138 }   oneshot_state;
 139
 140 static void oneshot_start(uint8_t mods, uint16_t time)
 141 {
 142     oneshot_state.mods = mods;
 143     oneshot_state.time = time;
 144     oneshot_state.ready = true;
 145 }
 146
 147 static void oneshot_cancel(void)
 148 {
 149     oneshot_state.mods = 0;
 150     oneshot_state.time = 0;
 151     oneshot_state.ready = false;
 152 }
 153
 154 static void oneshot_toggle(void)
 155 {
 156     oneshot_state.disabled = !oneshot_state.disabled;
 157 }
 158
 159
 160
 161 void action_exec(keyevent_t event)
 162 {
 163     if (!IS_NOEVENT(event)) {
 164         debug("\n---- action_exec: start -----\n");
 165         debug("EVENT: "); debug_event(event); debug("\n");
 166     }
 167
 168     keyrecord_t record = { .event = event };
 169
 170     // pre-process on tapping
 171     if (process_tapping(&record)) {
 172         if (!IS_NOEVENT(record.event)) {
 173             debug("processed: "); debug_record(record); debug("\n");
 174         }
 175     } else {
 176         // enqueue
 177         if (!waiting_buffer_enq(record)) {
 178             // clear all in case of overflow.
 179             debug("OVERFLOW: CLEAR ALL STATES\n");
 180             clear_keyboard();
 181             waiting_buffer_clear();
 182             tapping_key = (keyrecord_t){};
 183         }
 184     }
 185
 186     // process waiting_buffer
 187     if (!IS_NOEVENT(event) && waiting_buffer_head != waiting_buffer_tail) {
 188         debug("---- action_exec: process waiting_buffer -----\n");
 189     }
 190
 191     for (; waiting_buffer_tail != waiting_buffer_head; waiting_buffer_tail = (waiting_buffer_tail + 1) % WAITING_BUFFER_SIZE) {
 192         if (process_tapping(&waiting_buffer[waiting_buffer_tail])) {
 193             debug("processed: waiting_buffer["); debug_dec(waiting_buffer_tail); debug("] = ");
 194             debug_record(waiting_buffer[waiting_buffer_tail]); debug("\n\n");
 195         } else {
 196             break;
 197         }
 198     }
 199     if (!IS_NOEVENT(event)) {
 200         debug("\n");
 201     }
 202 }
 203
 204 static action_t get_action(key_t key)
 205 {
 206     action_t action = keymap_get_action(current_layer, key.pos.row, key.pos.col);
 207
 208     /* Transparently use default layer */
 209     if (action.code == ACTION_TRANSPARENT) {
 210         // TODO: layer stacking
 211         action = keymap_get_action(default_layer, key.pos.row, key.pos.col);
 212         debug("TRNASPARENT: "); debug_hex16(action.code); debug("\n");
 213     }
 214     return action;
 215 }
 216
 217 static void process_action(keyrecord_t *record)
 218 {
 219     keyevent_t event = record->event;
 220     uint8_t tap_count = record->tap_count;
 221
 222     if (IS_NOEVENT(event)) { return; }
 223
 224     action_t action = get_action(event.key);
 225     debug("ACTION: "); debug_action(action); debug("\n");
 226
 227     switch (action.kind.id) {
 228         /* Key and Mods */
 229         case ACT_LMODS:
 230         case ACT_RMODS:
 231             {
 232                 uint8_t mods = (action.kind.id == ACT_LMODS) ?  action.key.mods :
 233                                                                 action.key.mods<<4;
 234                 if (event.pressed) {
 235                     uint8_t tmp_mods = host_get_mods();
 236                     if (mods) {
 237                         host_add_mods(mods);
 238                         host_send_keyboard_report();
 239                     }
 240                     register_code(action.key.code);
 241                     if (mods && action.key.code) {
 242                         host_set_mods(tmp_mods);
 243                         host_send_keyboard_report();
 244                     }
 245                 } else {
 246                     if (mods && !action.key.code) {
 247                         host_del_mods(mods);
 248                         host_send_keyboard_report();
 249                     }
 250                     unregister_code(action.key.code);
 251                 }
 252             }
 253             break;
 254         case ACT_LMODS_TAP:
 255         case ACT_RMODS_TAP:
 256             {
 257                 uint8_t mods = (action.kind.id == ACT_LMODS_TAP) ?  action.key.mods :
 258                                                                     action.key.mods<<4;
 259                 switch (action.layer.code) {
 260                     case 0x00:
 261                         // Oneshot modifier
 262                         if (event.pressed) {
 263                             if (tap_count == 0) {
 264                                 debug("MODS_TAP: Oneshot: add_mods\n");
 265                                 add_mods(mods);
 266                             }
 267                             else if (tap_count == 1) {
 268                                 debug("MODS_TAP: Oneshot: start\n");
 269                                 oneshot_start(mods, event.time);
 270                             }
 271                             else if (tap_count == TAPPING_TOGGLE) {
 272                                 debug("MODS_TAP: Oneshot: toggle\n");
 273                                 oneshot_toggle();
 274                             }
 275                             else {
 276                                 debug("MODS_TAP: Oneshot: cancel&add_mods\n");
 277                                 // double tap cancels oneshot and works as normal modifier.
 278                                 oneshot_cancel();
 279                                 add_mods(mods);
 280                             }
 281                         } else {
 282                             if (tap_count == 0) {
 283                                 debug("MODS_TAP: Oneshot: cancel/del_mods\n");
 284                                 // cancel oneshot by holding.
 285                                 oneshot_cancel();
 286                                 del_mods(mods);
 287                             }
 288                             else if (tap_count == 1) {
 289                                 debug("MODS_TAP: Oneshot: del_mods\n");
 290                                 // retain Oneshot
 291                                 del_mods(mods);
 292                             }
 293                             else {
 294                                 debug("MODS_TAP: Oneshot: del_mods\n");
 295                                 // cancel Mods
 296                                 del_mods(mods);
 297                             }
 298                         }
 299                         break;
 300                     default:
 301                         if (event.pressed) {
 302                             if (tap_count > 0) {
 303                                 if (waiting_buffer_has_anykey_pressed()) {
 304                                     debug("MODS_TAP: Tap: Cancel: add_mods\n");
 305                                     // ad hoc: set 0 to cancel tap
 306                                     record->tap_count = 0;
 307                                     add_mods(mods);
 308                                 } else {
 309                                     debug("MODS_TAP: Tap: register_code\n");
 310                                     register_code(action.key.code);
 311                                 }
 312                             } else {
 313                                 debug("MODS_TAP: No tap: add_mods\n");
 314                                 add_mods(mods);
 315                             }
 316                         } else {
 317                             if (tap_count > 0) {
 318                                 debug("MODS_TAP: Tap: unregister_code\n");
 319                                 unregister_code(action.key.code);
 320                             } else {
 321                                 debug("MODS_TAP: No tap: add_mods\n");
 322                                 del_mods(mods);
 323                             }
 324                         }
 325                         break;
 326                 }
 327             }
 328             break;
 329
 330         /* other HID usage */
 331         case ACT_USAGE:
 332 #ifdef EXTRAKEY_ENABLE
 333             switch (action.usage.page) {
 334                 case PAGE_SYSTEM:
 335                     if (event.pressed) {
 336                         host_system_send(action.usage.code);
 337                     } else {
 338                         host_system_send(0);
 339                     }
 340                     break;
 341                 case PAGE_CONSUMER:
 342                     if (event.pressed) {
 343                         host_consumer_send(action.usage.code);
 344                     } else {
 345                         host_consumer_send(0);
 346                     }
 347                     break;
 348             }
 349 #endif
 350             break;
 351
 352         /* Mouse key */
 353         case ACT_MOUSEKEY:
 354 #ifdef MOUSEKEY_ENABLE
 355             if (event.pressed) {
 356                 mousekey_on(action.key.code);
 357                 mousekey_send();
 358             } else {
 359                 mousekey_off(action.key.code);
 360                 mousekey_send();
 361             }
 362 #endif
 363             break;
 364
 365         /* Layer key */
 366         case ACT_LAYER:
 367             switch (action.layer.code) {
 368                 case LAYER_MOMENTARY:  /* momentary */
 369                     if (event.pressed) {
 370                         layer_switch(action.layer.val);
 371                     }
 372                     else {
 373                         // NOTE: This is needed by legacy keymap support
 374                         layer_switch(default_layer);
 375                     }
 376                     break;
 377                 case LAYER_ON_PRESS:
 378                     if (event.pressed) {
 379                         layer_switch(action.layer.val);
 380                     }
 381                     break;
 382                 case LAYER_ON_RELEASE:
 383                     if (!event.pressed) {
 384                         layer_switch(action.layer.val);
 385                     }
 386                     break;
 387                 case LAYER_DEFAULT:  /* default layer */
 388                     switch (action.layer.val) {
 389                         case DEFAULT_ON_BOTH:
 390                             layer_switch(default_layer);
 391                             break;
 392                         case DEFAULT_ON_PRESS:
 393                             if (event.pressed) {
 394                                 layer_switch(default_layer);
 395                             }
 396                             break;
 397                         case DEFAULT_ON_RELEASE:
 398                             if (!event.pressed) {
 399                                 layer_switch(default_layer);
 400                             }
 401                             break;
 402                     }
 403                     break;
 404                 case LAYER_TAP_TOGGLE:  /* switch on hold and toggle on several taps */
 405                     if (event.pressed) {
 406                         if (tap_count < TAPPING_TOGGLE) {
 407                             layer_switch(action.layer.val);
 408                         }
 409                     } else {
 410                         if (tap_count >= TAPPING_TOGGLE) {
 411                             debug("LAYER_PRESSED: tap toggle.\n");
 412                             layer_switch(action.layer.val);
 413                         }
 414                     }
 415                     break;
 416                 case LAYER_CHANGE_DEFAULT:  /* change default layer */
 417                     if (event.pressed) {
 418                         default_layer = action.layer.val;
 419                         layer_switch(default_layer);
 420                     }
 421                     break;
 422                 default:    /* switch layer on hold and key on tap*/
 423                     if (event.pressed) {
 424                        if (tap_count > 0) {
 425                             debug("LAYER_PRESSED: Tap: register_code\n");
 426                             register_code(action.layer.code);
 427                        } else {
 428                             debug("LAYER_PRESSED: No tap: layer_switch\n");
 429                             layer_switch(action.layer.val);
 430                        }
 431                     } else {
 432                         if (tap_count > 0) {
 433                             debug("LAYER_PRESSED: Tap: unregister_code\n");
 434                             unregister_code(action.layer.code);
 435                         } else {
 436                             //debug("LAYER_PRESSED: No tap: NO ACTION\n");
 437                             // NOTE: This is needed by legacy keymap support
 438                             debug("LAYER_PRESSED: No tap: return to default layer\n");
 439                             layer_switch(default_layer);
 440                         }
 441                     }
 442                     break;
 443             }
 444             break;
 445         case ACT_LAYER_BIT:
 446             switch (action.layer.code) {
 447                 case LAYER_MOMENTARY:  /* momentary */
 448                     if (event.pressed) {
 449                         layer_switch(current_layer ^ action.layer.val);
 450                     } else {
 451                         layer_switch(current_layer ^ action.layer.val);
 452                     }
 453                     break;
 454                 case LAYER_ON_PRESS:
 455                     if (event.pressed) {
 456                         layer_switch(current_layer ^ action.layer.val);
 457                     }
 458                     break;
 459                 case LAYER_ON_RELEASE:
 460                     if (!event.pressed) {
 461                         layer_switch(current_layer ^ action.layer.val);
 462                     }
 463                     break;
 464                 case LAYER_TAP_TOGGLE:  /* switch on hold and toggle on several taps */
 465                     if (event.pressed) {
 466                         if (tap_count < TAPPING_TOGGLE) {
 467                             debug("LAYER_BIT: tap toggle(press).\n");
 468                             layer_switch(current_layer ^ action.layer.val);
 469                         }
 470                     } else {
 471                         if (tap_count <= TAPPING_TOGGLE) {
 472                             debug("LAYER_BIT: tap toggle(release).\n");
 473                             layer_switch(current_layer ^ action.layer.val);
 474                         }
 475                     }
 476                     break;
 477                 case 0xFF:
 478                     // change default layer
 479                     if (event.pressed) {
 480                         default_layer = current_layer ^ action.layer.val;
 481                         layer_switch(default_layer);
 482                     } else {
 483                         default_layer = current_layer ^ action.layer.val;
 484                         layer_switch(default_layer);
 485                     }
 486                     break;
 487                 default:
 488                     // with tap key
 489                     if (event.pressed) {
 490                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 491                             debug("LAYER_BIT: Tap: register_code\n");
 492                             register_code(action.layer.code);
 493                         } else {
 494                             debug("LAYER_BIT: No tap: layer_switch(bit on)\n");
 495                             layer_switch(current_layer ^ action.layer.val);
 496                         }
 497                     } else {
 498                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 499                             debug("LAYER_BIT: Tap: unregister_code\n");
 500                             unregister_code(action.layer.code);
 501                         } else {
 502                             debug("LAYER_BIT: No tap: layer_switch(bit off)\n");
 503                             layer_switch(current_layer ^ action.layer.val);
 504                         }
 505                     }
 506                     break;
 507             }
 508             break;
 509
 510         /* Extentions */
 511         case ACT_MACRO:
 512             break;
 513         case ACT_COMMAND:
 514             break;
 515         case ACT_FUNCTION:
 516             // TODO
 517             keymap_call_function(record, action.func.id, action.func.opt);
 518             break;
 519         default:
 520             break;
 521     }
 522 }
 523
 524 /* Tapping
 525  *
 526  * Rule: Tap key is typed(pressed and released) within TAPPING_TERM.
 527  *       (without interfering by typing other key)
 528  */
 529 /* return true when key event is processed or consumed. */
 530 static bool process_tapping(keyrecord_t *keyp)
 531 {
 532     keyevent_t event = keyp->event;
 533
 534     // if tapping
 535     if (IS_TAPPING_PRESSED()) {
 536         if (WITHIN_TAPPING_TERM(event)) {
 537             if (tapping_key.tap_count == 0) {
 538                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 539                     // first tap!
 540                     debug("Tapping: First tap(0->1).\n");
 541                     tapping_key.tap_count = 1;
 542                     debug_tapping_key();
 543                     process_action(&tapping_key);
 544
 545                     // enqueue
 546                     keyp->tap_count = tapping_key.tap_count;
 547                     return false;
 548                 }
 549 #if TAPPING_TERM >= 500
 550                 /* This can prevent from typing some tap keys in a row at a time. */
 551                 else if (!event.pressed && waiting_buffer_typed(event)) {
 552                     // other key typed. not tap.
 553                     debug("Tapping: End. No tap. Interfered by typing key\n");
 554                     process_action(&tapping_key);
 555                     tapping_key = (keyrecord_t){};
 556                     debug_tapping_key();
 557
 558                     // enqueue
 559                     return false;
 560                 }
 561 #endif
 562                 else {
 563                     // other key events shall be enq'd till tapping state settles.
 564                     return false;
 565                 }
 566             }
 567             // tap_count > 0
 568             else {
 569                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 570                     debug("Tapping: Tap release("); debug_dec(tapping_key.tap_count); debug(")\n");
 571                     keyp->tap_count = tapping_key.tap_count;
 572                     process_action(keyp);
 573                     tapping_key = *keyp;
 574                     debug_tapping_key();
 575                     return true;
 576                 }
 577                 else if (is_tap_key(keyp->event.key) && event.pressed) {
 578                     if (tapping_key.tap_count > 1) {
 579                         debug("Tapping: Start new tap with releasing last tap(>1).\n");
 580                         // unregister key
 581                         process_action(&(keyrecord_t){
 582                                 .tap_count = tapping_key.tap_count,
 583                                 .event.key = tapping_key.event.key,
 584                                 .event.time = event.time,
 585                                 .event.pressed = false
 586                         });
 587                     } else {
 588                         debug("Tapping: Start while last tap(1).\n");
 589                     }
 590                     tapping_key = *keyp;
 591                     waiting_buffer_scan_tap();
 592                     debug_tapping_key();
 593                     return true;
 594                 }
 595                 else {
 596                     if (!IS_NOEVENT(keyp->event)) {
 597                         debug("Tapping: key event while last tap(>0).\n");
 598                     }
 599                     process_action(keyp);
 600                     return true;
 601                 }
 602             }
 603         }
 604         // after TAPPING_TERM
 605         else {
 606             if (tapping_key.tap_count == 0) {
 607                 debug("Tapping: End. Timeout. Not tap(0): ");
 608                 debug_event(event); debug("\n");
 609                 process_action(&tapping_key);
 610                 tapping_key = (keyrecord_t){};
 611                 debug_tapping_key();
 612                 return false;
 613             }  else {
 614                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 615                     debug("Tapping: End. last timeout tap release(>0).");
 616                     keyp->tap_count = tapping_key.tap_count;
 617                     process_action(keyp);
 618                     tapping_key = (keyrecord_t){};
 619                     return true;
 620                 }
 621                 else if (is_tap_key(keyp->event.key) && event.pressed) {
 622                     if (tapping_key.tap_count > 1) {
 623                         debug("Tapping: Start new tap with releasing last timeout tap(>1).\n");
 624                         // unregister key
 625                         process_action(&(keyrecord_t){
 626                                 .tap_count = tapping_key.tap_count,
 627                                 .event.key = tapping_key.event.key,
 628                                 .event.time = event.time,
 629                                 .event.pressed = false
 630                         });
 631                     } else {
 632                         debug("Tapping: Start while last timeout tap(1).\n");
 633                     }
 634                     tapping_key = *keyp;
 635                     waiting_buffer_scan_tap();
 636                     debug_tapping_key();
 637                     return true;
 638                 }
 639                 else {
 640                     if (!IS_NOEVENT(keyp->event)) {
 641                         debug("Tapping: key event while last timeout tap(>0).\n");
 642                     }
 643                     process_action(keyp);
 644                     return true;
 645                 }
 646             }
 647         }
 648     } else if (IS_TAPPING_RELEASED()) {
 649         if (WITHIN_TAPPING_TERM(event)) {
 650             if (tapping_key.tap_count > 0 && IS_TAPPING_KEY(event.key) && event.pressed) {
 651                 // sequential tap.
 652                 keyp->tap_count = tapping_key.tap_count + 1;
 653                 debug("Tapping: Tap press("); debug_dec(keyp->tap_count); debug(")\n");
 654                 process_action(keyp);
 655                 tapping_key = *keyp;
 656                 debug_tapping_key();
 657                 return true;
 658             } else if (event.pressed && is_tap_key(event.key)) {
 659                 // Sequential tap can be interfered with other tap key.
 660                 debug("Tapping: Start with interfering other tap.\n");
 661                 tapping_key = *keyp;
 662                 waiting_buffer_scan_tap();
 663                 debug_tapping_key();
 664                 return true;
 665             } else {
 666                 if (!IS_NOEVENT(keyp->event)) debug("Tapping: other key just after tap.\n");
 667                 process_action(keyp);
 668                 return true;
 669             }
 670         } else {
 671             // timeout. no sequential tap.
 672             debug("Tapping: End(Timeout after releasing last tap): ");
 673             debug_event(event); debug("\n");
 674             tapping_key = (keyrecord_t){};
 675             debug_tapping_key();
 676             return false;
 677         }
 678     }
 679     // not tapping satate
 680     else {
 681         if (event.pressed && is_tap_key(event.key)) {
 682             debug("Tapping: Start(Press tap key).\n");
 683             tapping_key = *keyp;
 684             waiting_buffer_scan_tap();
 685             debug_tapping_key();
 686             return true;
 687         } else {
 688             process_action(keyp);
 689             return true;
 690         }
 691     }
 692 }
 693
 694 /* scan buffer for tapping */
 695 static void waiting_buffer_scan_tap(void)
 696 {
 697     // tapping already is settled
 698     if (tapping_key.tap_count > 0) return;
 699     // invalid state: tapping_key released && tap_count == 0
 700     if (!tapping_key.event.pressed) return;
 701
 702     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 703         if (IS_TAPPING_KEY(waiting_buffer[i].event.key) &&
 704                 !waiting_buffer[i].event.pressed &&
 705                 WITHIN_TAPPING_TERM(waiting_buffer[i].event)) {
 706             tapping_key.tap_count = 1;
 707             waiting_buffer[i].tap_count = 1;
 708             process_action(&tapping_key);
 709
 710             debug("waiting_buffer_scan_tap: found at ["); debug_dec(i); debug("]\n");
 711             debug_waiting_buffer();
 712             return;
 713         }
 714     }
 715 }
 716
 717
 718
 719 /*
 720  * Utilities for actions.
 721  */
 722 void register_code(uint8_t code)
 723 {
 724     if (code == KC_NO) {
 725         return;
 726     }
 727     else if IS_KEY(code) {
 728         // TODO: should push command_proc out of this block?
 729         if (command_proc(code)) return;
 730
 731         if (oneshot_state.mods && oneshot_state.ready && !oneshot_state.disabled) {
 732             uint8_t tmp_mods = host_get_mods();
 733             host_add_mods(oneshot_state.mods);
 734             host_add_key(code);
 735             host_send_keyboard_report();
 736
 737             host_set_mods(tmp_mods);
 738             oneshot_state.ready = false;
 739         } else {
 740             host_add_key(code);
 741             host_send_keyboard_report();
 742         }
 743     }
 744     else if IS_MOD(code) {
 745         host_add_mods(MOD_BIT(code));
 746         host_send_keyboard_report();
 747     }
 748 }
 749
 750 void unregister_code(uint8_t code)
 751 {
 752     if IS_KEY(code) {
 753         host_del_key(code);
 754         host_send_keyboard_report();
 755     }
 756     else if IS_MOD(code) {
 757         host_del_mods(MOD_BIT(code));
 758         host_send_keyboard_report();
 759     }
 760 }
 761
 762 void add_mods(uint8_t mods)
 763 {
 764     if (mods) {
 765         host_add_mods(mods);
 766         host_send_keyboard_report();
 767     }
 768 }
 769
 770 void del_mods(uint8_t mods)
 771 {
 772     if (mods) {
 773         host_del_mods(mods);
 774         host_send_keyboard_report();
 775     }
 776 }
 777
 778 void set_mods(uint8_t mods)
 779 {
 780     host_set_mods(mods);
 781     host_send_keyboard_report();
 782 }
 783
 784 void clear_keyboard(void)
 785 {
 786     host_clear_mods();
 787     clear_keyboard_but_mods();
 788 }
 789
 790 void clear_keyboard_but_mods(void)
 791 {
 792     host_clear_keys();
 793     host_send_keyboard_report();
 794 #ifdef MOUSEKEY_ENABLE
 795     mousekey_clear();
 796     mousekey_send();
 797 #endif
 798 #ifdef EXTRAKEY_ENABLE
 799     host_system_send(0);
 800     host_consumer_send(0);
 801 #endif
 802 }
 803
 804 bool sending_anykey(void)
 805 {
 806     return (host_has_anykey() || host_mouse_in_use() ||
 807             host_last_sysytem_report() || host_last_consumer_report());
 808 }
 809
 810 void layer_switch(uint8_t new_layer)
 811 {
 812     if (current_layer != new_layer) {
 813         debug("Layer Switch: "); debug_hex(current_layer);
 814         debug(" -> "); debug_hex(new_layer); debug("\n");
 815
 816         current_layer = new_layer;
 817         clear_keyboard_but_mods(); // To avoid stuck keys
 818         // NOTE: update mods with full scan of matrix? if modifier changes between layers
 819     }
 820 }
 821
 822 bool is_tap_key(key_t key)
 823 {
 824     action_t action = get_action(key);
 825
 826     switch (action.kind.id) {
 827         case ACT_LMODS_TAP:
 828         case ACT_RMODS_TAP:
 829             return true;
 830         case ACT_LAYER:
 831         case ACT_LAYER_BIT:
 832             switch (action.layer.code) {
 833                 case LAYER_MOMENTARY:
 834                 case LAYER_ON_PRESS:
 835                 case LAYER_ON_RELEASE:
 836                 case LAYER_DEFAULT:
 837                     return false;
 838                 case LAYER_TAP_TOGGLE:
 839                 default:    /* tap key */
 840                     return true;
 841             }
 842             return false;
 843         case ACT_FUNCTION:
 844             if (action.func.opt & FUNC_TAP) { return true; }
 845             return false;
 846     }
 847     return false;
 848 }
 849
 850
 851 /*
 852  * debug print
 853  */
 854 static void debug_event(keyevent_t event)
 855 {
 856     debug_hex16(event.key.raw);
 857     if (event.pressed) debug("d("); else debug("u(");
 858     debug_dec(event.time); debug(")");
 859 }
 860 static void debug_record(keyrecord_t record)
 861 {
 862     debug_event(record.event); debug(":"); debug_dec(record.tap_count);
 863 }
 864 static void debug_action(action_t action)
 865 {
 866     switch (action.kind.id) {
 867         case ACT_LMODS:             debug("ACT_LMODS");             break;
 868         case ACT_RMODS:             debug("ACT_RMODS");             break;
 869         case ACT_LMODS_TAP:         debug("ACT_LMODS_TAP");         break;
 870         case ACT_RMODS_TAP:         debug("ACT_RMODS_TAP");         break;
 871         case ACT_USAGE:             debug("ACT_USAGE");             break;
 872         case ACT_MOUSEKEY:          debug("ACT_MOUSEKEY");          break;
 873         case ACT_LAYER:             debug("ACT_LAYER");     break;
 874         case ACT_LAYER_BIT:         debug("ACT_LAYER_BIT");         break;
 875         case ACT_MACRO:             debug("ACT_MACRO");             break;
 876         case ACT_COMMAND:           debug("ACT_COMMAND");           break;
 877         case ACT_FUNCTION:          debug("ACT_FUNCTION");          break;
 878         default:                    debug("UNKNOWN");               break;
 879     }
 880     debug("[");
 881     debug_hex4(action.kind.param>>8);
 882     debug(":");
 883     debug_hex8(action.kind.param & 0xff);
 884     debug("]");
 885 }
 886 static void debug_tapping_key(void)
 887 {
 888     debug("TAPPING_KEY="); debug_record(tapping_key); debug("\n");
 889 }
 890 static void debug_waiting_buffer(void)
 891 {
 892     debug("{ ");
 893     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 894         debug("["); debug_dec(i); debug("]="); debug_record(waiting_buffer[i]); debug(" ");
 895     }
 896     debug("}\n");
 897 }