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 static 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 void process_action(keyrecord_t *record)
 205 {
 206     keyevent_t event = record->event;
 207     uint8_t tap_count = record->tap_count;
 208
 209     if (IS_NOEVENT(event)) { return; }
 210
 211     action_t action = keymap_get_action(current_layer, event.key.pos.row, event.key.pos.col);
 212     //debug("action: "); debug_hex16(action.code); if (event.pressed) debug("d\n"); else debug("u\n");
 213     debug("ACTION: "); debug_action(action); debug("\n");
 214
 215     switch (action.kind.id) {
 216         /* Key and Mods */
 217         case ACT_LMODS:
 218         case ACT_RMODS:
 219             {
 220                 uint8_t mods = (action.kind.id == ACT_LMODS) ?  action.key.mods :
 221                                                                 action.key.mods<<4;
 222                 if (event.pressed) {
 223                     uint8_t tmp_mods = host_get_mods();
 224                     if (mods) {
 225                         host_add_mods(mods);
 226                         host_send_keyboard_report();
 227                     }
 228                     register_code(action.key.code);
 229                     if (mods && action.key.code) {
 230                         host_set_mods(tmp_mods);
 231                         host_send_keyboard_report();
 232                     }
 233                 } else {
 234                     if (mods && !action.key.code) {
 235                         host_del_mods(mods);
 236                         host_send_keyboard_report();
 237                     }
 238                     unregister_code(action.key.code);
 239                 }
 240             }
 241             break;
 242         case ACT_LMODS_TAP:
 243         case ACT_RMODS_TAP:
 244             {
 245                 uint8_t mods = (action.kind.id == ACT_LMODS_TAP) ?  action.key.mods :
 246                                                                     action.key.mods<<4;
 247                 switch (action.layer.code) {
 248                     case 0x00:
 249                         // Oneshot modifier
 250                         if (event.pressed) {
 251                             if (tap_count == 0) {
 252                                 debug("MODS_TAP: Oneshot: add_mods\n");
 253                                 add_mods(mods);
 254                             }
 255                             else if (tap_count == 1) {
 256                                 debug("MODS_TAP: Oneshot: start\n");
 257                                 oneshot_start(mods, event.time);
 258                             }
 259                             else if (tap_count == 5) {
 260                                 debug("MODS_TAP: Oneshot: toggle\n");
 261                                 oneshot_toggle();
 262                             }
 263                             else {
 264                                 debug("MODS_TAP: Oneshot: cancel&add_mods\n");
 265                                 // double tap cancels oneshot and works as normal modifier.
 266                                 oneshot_cancel();
 267                                 add_mods(mods);
 268                             }
 269                         } else {
 270                             if (tap_count == 0) {
 271                                 debug("MODS_TAP: Oneshot: cancel/del_mods\n");
 272                                 // cancel oneshot by holding.
 273                                 oneshot_cancel();
 274                                 del_mods(mods);
 275                             }
 276                             else if (tap_count == 1) {
 277                                 debug("MODS_TAP: Oneshot: del_mods\n");
 278                                 // retain Oneshot
 279                                 del_mods(mods);
 280                             }
 281                             else {
 282                                 debug("MODS_TAP: Oneshot: del_mods\n");
 283                                 // cancel Mods
 284                                 del_mods(mods);
 285                             }
 286                         }
 287                         break;
 288                     default:
 289                         if (event.pressed) {
 290                             if (tap_count > 0) {
 291                                 if (waiting_buffer_has_anykey_pressed()) {
 292                                     debug("MODS_TAP: Tap: Cancel: add_mods\n");
 293                                     // ad hoc: set 0 to cancel tap
 294                                     record->tap_count = 0;
 295                                     add_mods(mods);
 296                                 } else {
 297                                     debug("MODS_TAP: Tap: register_code\n");
 298                                     register_code(action.key.code);
 299                                 }
 300                             } else {
 301                                 debug("MODS_TAP: No tap: add_mods\n");
 302                                 add_mods(mods);
 303                             }
 304                         } else {
 305                             if (tap_count > 0) {
 306                                 debug("MODS_TAP: Tap: unregister_code\n");
 307                                 unregister_code(action.key.code);
 308                             } else {
 309                                 debug("MODS_TAP: No tap: add_mods\n");
 310                                 del_mods(mods);
 311                             }
 312                         }
 313                         break;
 314                 }
 315             }
 316             break;
 317
 318         /* other HID usage */
 319         case ACT_USAGE:
 320 #ifdef EXTRAKEY_ENABLE
 321             switch (action.usage.page) {
 322                 case ACTION_USAGE_PAGE_SYSTEM:
 323                     if (event.pressed) {
 324                         host_system_send(action.usage.code);
 325                     } else {
 326                         host_system_send(0);
 327                     }
 328                     break;
 329                 case ACTION_USAGE_PAGE_CONSUMER:
 330                     if (event.pressed) {
 331                         host_consumer_send(action.usage.code);
 332                     } else {
 333                         host_consumer_send(0);
 334                     }
 335                     break;
 336             }
 337 #endif
 338             break;
 339
 340         /* Mouse key */
 341         case ACT_MOUSEKEY:
 342 #ifdef MOUSEKEY_ENABLE
 343             if (event.pressed) {
 344                 mousekey_on(action.key.code);
 345                 mousekey_send();
 346             } else {
 347                 mousekey_off(action.key.code);
 348                 mousekey_send();
 349             }
 350 #endif
 351             break;
 352
 353         /* Layer key */
 354         case ACT_LAYER_PRESSED:
 355             // layer action when pressed
 356             switch (action.layer.code) {
 357                 case 0x00:
 358                     if (event.pressed) {
 359                         layer_switch(action.layer.opt);
 360                     }
 361                     break;
 362                 case 0xF0:
 363                     // tap toggle
 364                     if (event.pressed) {
 365                         if (tap_count < TAPPING_TOGGLE) {
 366                             layer_switch(action.layer.opt);
 367                         }
 368                     } else {
 369                         if (tap_count >= TAPPING_TOGGLE) {
 370                             debug("LAYER_PRESSED: tap toggle.\n");
 371                             layer_switch(action.layer.opt);
 372                         }
 373                     }
 374                     break;
 375                 case 0xFF:
 376                     // change default layer
 377                     if (event.pressed) {
 378                         default_layer = action.layer.opt;
 379                         layer_switch(default_layer);
 380                     }
 381                     break;
 382                 default:
 383                     // with tap key
 384                     if (event.pressed) {
 385                        if (tap_count > 0) {
 386                             debug("LAYER_PRESSED: Tap: register_code\n");
 387                             register_code(action.layer.code);
 388                        } else {
 389                             debug("LAYER_PRESSED: No tap: layer_switch\n");
 390                             layer_switch(action.layer.opt);
 391                        }
 392                     } else {
 393                         if (tap_count > 0) {
 394                             debug("LAYER_PRESSED: Tap: unregister_code\n");
 395                             unregister_code(action.layer.code);
 396                         } else {
 397                             debug("LAYER_PRESSED: No tap: NO ACTION\n");
 398                         }
 399                     }
 400                     break;
 401             }
 402             break;
 403         case ACT_LAYER_RELEASED:
 404             switch (action.layer.code) {
 405                 case 0x00:
 406                     if (!event.pressed) {
 407                         layer_switch(action.layer.opt);
 408                     }
 409                     break;
 410                 case 0xF0:
 411                     // tap toggle
 412                     if (event.pressed) {
 413                         if (tap_count >= TAPPING_TOGGLE) {
 414                             debug("LAYER_RELEASED: tap toggle.\n");
 415                             layer_switch(action.layer.opt);
 416                         }
 417                     } else {
 418                         if (tap_count < TAPPING_TOGGLE) {
 419                             layer_switch(action.layer.opt);
 420                         }
 421                     }
 422                     break;
 423                 case 0xFF:
 424                     // change default layer
 425                     if (!event.pressed) {
 426                         default_layer = action.layer.opt;
 427                         layer_switch(default_layer);
 428                     }
 429                     break;
 430                 default:
 431                     // with tap key
 432                     if (event.pressed) {
 433                        if (tap_count > 0) {
 434                             debug("LAYER_RELEASED: Tap: register_code\n");
 435                             register_code(action.layer.code);
 436                        } else {
 437                             debug("LAYER_RELEASED: No tap: NO ACTION\n");
 438                        }
 439                     } else {
 440                         if (tap_count > 0) {
 441                             debug("LAYER_RELEASED: Tap: unregister_code\n");
 442                             unregister_code(action.layer.code);
 443                         } else {
 444                             debug("LAYER_RELEASED: No tap: layer_switch\n");
 445                             layer_switch(action.layer.opt);
 446                         }
 447                     }
 448                     break;
 449             }
 450             break;
 451         case ACT_LAYER_BIT:
 452             switch (action.layer.code) {
 453                 case 0x00:
 454                     if (event.pressed) {
 455                         layer_switch(current_layer ^ action.layer.opt);
 456                     } else {
 457                         layer_switch(current_layer ^ action.layer.opt);
 458                     }
 459                     break;
 460                 case 0xF0:
 461                     // tap toggle
 462                     if (event.pressed) {
 463                         if (tap_count < TAPPING_TOGGLE) {
 464                             debug("LAYER_BIT: tap toggle(press).\n");
 465                             layer_switch(current_layer ^ action.layer.opt);
 466                         }
 467                     } else {
 468                         if (tap_count <= TAPPING_TOGGLE) {
 469                             debug("LAYER_BIT: tap toggle(release).\n");
 470                             layer_switch(current_layer ^ action.layer.opt);
 471                         }
 472                     }
 473                     break;
 474                 case 0xFF:
 475                     // change default layer
 476                     if (event.pressed) {
 477                         default_layer = current_layer ^ action.layer.opt;
 478                         layer_switch(default_layer);
 479                     } else {
 480                         default_layer = current_layer ^ action.layer.opt;
 481                         layer_switch(default_layer);
 482                     }
 483                     break;
 484                 default:
 485                     // with tap key
 486                     if (event.pressed) {
 487                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 488                             debug("LAYER_BIT: Tap: register_code\n");
 489                             register_code(action.layer.code);
 490                         } else {
 491                             debug("LAYER_BIT: No tap: layer_switch(bit on)\n");
 492                             layer_switch(current_layer ^ action.layer.opt);
 493                         }
 494                     } else {
 495                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 496                             debug("LAYER_BIT: Tap: unregister_code\n");
 497                             unregister_code(action.layer.code);
 498                         } else {
 499                             debug("LAYER_BIT: No tap: layer_switch(bit off)\n");
 500                             layer_switch(current_layer ^ action.layer.opt);
 501                         }
 502                     }
 503                     break;
 504             }
 505             break;
 506         case ACT_LAYER_EXT:
 507             switch (action.layer.opt) {
 508                 case 0x00:
 509                     // set default layer when pressed
 510                     switch (action.layer.code) {
 511                         case 0x00:
 512                             if (event.pressed) {
 513                                 layer_switch(default_layer);
 514                             }
 515                             break;
 516                         case 0xF0:
 517                             // tap toggle
 518                             if (event.pressed) {
 519                                 if (tap_count < TAPPING_TOGGLE) {
 520                                     layer_switch(default_layer);
 521                                 }
 522                             } else {
 523                                 if (tap_count >= TAPPING_TOGGLE) {
 524                                     debug("LAYER_EXT_PRESSED: tap toggle.\n");
 525                                     layer_switch(default_layer);
 526                                 }
 527                             }
 528                             break;
 529                         case 0xFF:
 530                             // change default layer
 531                             if (event.pressed) {
 532                                 default_layer = current_layer;
 533                                 layer_switch(default_layer);
 534                             }
 535                             break;
 536                         default:
 537                             // with tap key
 538                             if (event.pressed) {
 539                                if (tap_count > 0) {
 540                                     debug("LAYER_EXT_PRESSED: Tap: register_code\n");
 541                                     register_code(action.layer.code);
 542                                } else {
 543                                     debug("LAYER_EXT_PRESSED: No tap: layer_switch\n");
 544                                     layer_switch(default_layer);
 545                                }
 546                             } else {
 547                                 if (tap_count > 0) {
 548                                     debug("LAYER_EXT_PRESSED: Tap: unregister_code\n");
 549                                     unregister_code(action.layer.code);
 550                                 } else {
 551                                     debug("LAYER_EXT_PRESSED: No tap: NO ACTION\n");
 552                                 }
 553                             }
 554                             break;
 555                     }
 556                     break;
 557                 case 0x01:
 558                     // set default layer when released
 559                     switch (action.layer.code) {
 560                         case 0x00:
 561                             if (!event.pressed) {
 562                                 layer_switch(default_layer);
 563                             }
 564                             break;
 565                         case 0xF0:
 566                             // tap toggle
 567                             if (event.pressed) {
 568                                 if (tap_count >= TAPPING_TOGGLE) {
 569                                     debug("LAYER_EXT_RELEASED: tap toggle.\n");
 570                                     layer_switch(default_layer);
 571                                 }
 572                             } else {
 573                                 if (tap_count < TAPPING_TOGGLE) {
 574                                     layer_switch(default_layer);
 575                                 }
 576                             }
 577                             break;
 578                         case 0xFF:
 579                             // change default layer
 580                             if (!event.pressed) {
 581                                 default_layer = current_layer;
 582                                 layer_switch(default_layer);
 583                             }
 584                             break;
 585                         default:
 586                             // with tap key
 587                             if (event.pressed) {
 588                                if (tap_count > 0) {
 589                                     debug("LAYER_EXT_RELEASED: Tap: register_code\n");
 590                                     register_code(action.layer.code);
 591                                } else {
 592                                     debug("LAYER_EXT_RELEASED: No tap: NO ACTION\n");
 593                                }
 594                             } else {
 595                                 if (tap_count > 0) {
 596                                     debug("LAYER_EXT_RELEASED: Tap: unregister_code\n");
 597                                     unregister_code(action.layer.code);
 598                                 } else {
 599                                     debug("LAYER_EXT_RELEASED: No tap: layer_switch\n");
 600                                     layer_switch(default_layer);
 601                                 }
 602                             }
 603                             break;
 604                     }
 605                     break;
 606             }
 607             break;
 608
 609         /* Extentions */
 610         case ACT_MACRO:
 611             break;
 612         case ACT_COMMAND:
 613             break;
 614         case ACT_FUNCTION:
 615             // TODO
 616             action_call_function(event, action.func.id);
 617             break;
 618         default:
 619             break;
 620     }
 621 }
 622
 623 /* Tapping
 624  *
 625  * Rule: Tap key is typed(pressed and released) within TAPPING_TERM.
 626  *       (without interfering by typing other key)
 627  */
 628 /* return true when key event is processed or consumed. */
 629 static bool process_tapping(keyrecord_t *keyp)
 630 {
 631     keyevent_t event = keyp->event;
 632
 633     // if tapping
 634     if (IS_TAPPING_PRESSED()) {
 635         if (WITHIN_TAPPING_TERM(event)) {
 636             if (tapping_key.tap_count == 0) {
 637                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 638                     // first tap!
 639                     debug("Tapping: First tap(0->1).\n");
 640                     tapping_key.tap_count = 1;
 641                     debug_tapping_key();
 642                     process_action(&tapping_key);
 643
 644                     // enqueue
 645                     keyp->tap_count = tapping_key.tap_count;
 646                     return false;
 647                 }
 648 #if TAPPING_TERM >= 500
 649                 /* This can prevent from typing some tap keys in a row at a time. */
 650                 else if (!event.pressed && waiting_buffer_typed(event)) {
 651                     // other key typed. not tap.
 652                     debug("Tapping: End. No tap. Interfered by typing key\n");
 653                     process_action(&tapping_key);
 654                     tapping_key = (keyrecord_t){};
 655                     debug_tapping_key();
 656
 657                     // enqueue
 658                     return false;
 659                 }
 660 #endif
 661                 else {
 662                     // other key events shall be enq'd till tapping state settles.
 663                     return false;
 664                 }
 665             }
 666             // tap_count > 0
 667             else {
 668                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 669                     debug("Tapping: Tap release("); debug_dec(tapping_key.tap_count); debug(")\n");
 670                     keyp->tap_count = tapping_key.tap_count;
 671                     process_action(keyp);
 672                     tapping_key = *keyp;
 673                     debug_tapping_key();
 674                     return true;
 675                 }
 676                 else if (is_tap_key(keyp->event.key) && event.pressed) {
 677                     if (tapping_key.tap_count > 1) {
 678                         debug("Tapping: Start new tap with releasing last tap(>1).\n");
 679                         // unregister key
 680                         process_action(&(keyrecord_t){
 681                                 .tap_count = tapping_key.tap_count,
 682                                 .event.key = tapping_key.event.key,
 683                                 .event.time = event.time,
 684                                 .event.pressed = false
 685                         });
 686                     } else {
 687                         debug("Tapping: Start while last tap(1).\n");
 688                     }
 689                     tapping_key = *keyp;
 690                     waiting_buffer_scan_tap();
 691                     debug_tapping_key();
 692                     return true;
 693                 }
 694                 else {
 695                     if (!IS_NOEVENT(keyp->event)) {
 696                         debug("Tapping: key event while last tap(>0).\n");
 697                     }
 698                     process_action(keyp);
 699                     return true;
 700                 }
 701             }
 702         }
 703         // after TAPPING_TERM
 704         else {
 705             if (tapping_key.tap_count == 0) {
 706                 debug("Tapping: End. Timeout. Not tap(0): ");
 707                 debug_event(event); debug("\n");
 708                 process_action(&tapping_key);
 709                 tapping_key = (keyrecord_t){};
 710                 debug_tapping_key();
 711                 return false;
 712             }  else {
 713                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 714                     debug("Tapping: End. last timeout tap release(>0).");
 715                     keyp->tap_count = tapping_key.tap_count;
 716                     process_action(keyp);
 717                     tapping_key = (keyrecord_t){};
 718                     return true;
 719                 }
 720                 else if (is_tap_key(keyp->event.key) && event.pressed) {
 721                     if (tapping_key.tap_count > 1) {
 722                         debug("Tapping: Start new tap with releasing last timeout tap(>1).\n");
 723                         // unregister key
 724                         process_action(&(keyrecord_t){
 725                                 .tap_count = tapping_key.tap_count,
 726                                 .event.key = tapping_key.event.key,
 727                                 .event.time = event.time,
 728                                 .event.pressed = false
 729                         });
 730                     } else {
 731                         debug("Tapping: Start while last timeout tap(1).\n");
 732                     }
 733                     tapping_key = *keyp;
 734                     waiting_buffer_scan_tap();
 735                     debug_tapping_key();
 736                     return true;
 737                 }
 738                 else {
 739                     if (!IS_NOEVENT(keyp->event)) {
 740                         debug("Tapping: key event while last timeout tap(>0).\n");
 741                     }
 742                     process_action(keyp);
 743                     return true;
 744                 }
 745             }
 746         }
 747     } else if (IS_TAPPING_RELEASED()) {
 748         if (WITHIN_TAPPING_TERM(event)) {
 749             if (tapping_key.tap_count > 0 && IS_TAPPING_KEY(event.key) && event.pressed) {
 750                 // sequential tap.
 751                 keyp->tap_count = tapping_key.tap_count + 1;
 752                 debug("Tapping: Tap press("); debug_dec(keyp->tap_count); debug(")\n");
 753                 process_action(keyp);
 754                 tapping_key = *keyp;
 755                 debug_tapping_key();
 756                 return true;
 757             } else if (event.pressed && is_tap_key(event.key)) {
 758                 // Sequential tap can be interfered with other tap key.
 759                 debug("Tapping: Start with interfering other tap.\n");
 760                 tapping_key = *keyp;
 761                 waiting_buffer_scan_tap();
 762                 debug_tapping_key();
 763                 return true;
 764             } else {
 765                 if (!IS_NOEVENT(keyp->event)) debug("Tapping: other key just after tap.\n");
 766                 process_action(keyp);
 767                 return true;
 768             }
 769         } else {
 770             // timeout. no sequential tap.
 771             debug("Tapping: End(Timeout after releasing last tap): ");
 772             debug_event(event); debug("\n");
 773             tapping_key = (keyrecord_t){};
 774             debug_tapping_key();
 775             return false;
 776         }
 777     }
 778     // not tapping satate
 779     else {
 780         if (event.pressed && is_tap_key(event.key)) {
 781             debug("Tapping: Start(Press tap key).\n");
 782             tapping_key = *keyp;
 783             waiting_buffer_scan_tap();
 784             debug_tapping_key();
 785             return true;
 786         } else {
 787             process_action(keyp);
 788             return true;
 789         }
 790     }
 791 }
 792
 793 /* scan buffer for tapping */
 794 static void waiting_buffer_scan_tap(void)
 795 {
 796     // tapping already is settled
 797     if (tapping_key.tap_count > 0) return;
 798     // invalid state: tapping_key released && tap_count == 0
 799     if (!tapping_key.event.pressed) return;
 800
 801     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 802         if (IS_TAPPING_KEY(waiting_buffer[i].event.key) &&
 803                 !waiting_buffer[i].event.pressed &&
 804                 WITHIN_TAPPING_TERM(waiting_buffer[i].event)) {
 805             tapping_key.tap_count = 1;
 806             waiting_buffer[i].tap_count = 1;
 807             process_action(&tapping_key);
 808
 809             debug("waiting_buffer_scan_tap: found at ["); debug_dec(i); debug("]\n");
 810             debug_waiting_buffer();
 811             return;
 812         }
 813     }
 814 }
 815
 816
 817
 818 /*
 819  * Utilities for actions.
 820  */
 821 void register_code(uint8_t code)
 822 {
 823     if (code == KC_NO) {
 824         return;
 825     }
 826     else if IS_KEY(code) {
 827         // TODO: should push command_proc out of this block?
 828         if (command_proc(code)) return;
 829
 830         if (oneshot_state.mods && oneshot_state.ready && !oneshot_state.disabled) {
 831             uint8_t tmp_mods = host_get_mods();
 832             host_add_mods(oneshot_state.mods);
 833             host_add_key(code);
 834             host_send_keyboard_report();
 835
 836             host_set_mods(tmp_mods);
 837             oneshot_state.ready = false;
 838         } else {
 839             host_add_key(code);
 840             host_send_keyboard_report();
 841         }
 842     }
 843     else if IS_MOD(code) {
 844         host_add_mods(MOD_BIT(code));
 845         host_send_keyboard_report();
 846     }
 847 }
 848
 849 void unregister_code(uint8_t code)
 850 {
 851     if IS_KEY(code) {
 852         host_del_key(code);
 853         host_send_keyboard_report();
 854     }
 855     else if IS_MOD(code) {
 856         host_del_mods(MOD_BIT(code));
 857         host_send_keyboard_report();
 858     }
 859 }
 860
 861 void add_mods(uint8_t mods)
 862 {
 863     if (mods) {
 864         host_add_mods(mods);
 865         host_send_keyboard_report();
 866     }
 867 }
 868
 869 void del_mods(uint8_t mods)
 870 {
 871     if (mods) {
 872         host_del_mods(mods);
 873         host_send_keyboard_report();
 874     }
 875 }
 876
 877 void set_mods(uint8_t mods)
 878 {
 879     host_set_mods(mods);
 880     host_send_keyboard_report();
 881 }
 882
 883 void clear_keyboard(void)
 884 {
 885     host_clear_mods();
 886     clear_keyboard_but_mods();
 887 }
 888
 889 void clear_keyboard_but_mods(void)
 890 {
 891     host_clear_keys();
 892     host_send_keyboard_report();
 893 #ifdef MOUSEKEY_ENABLE
 894     mousekey_clear();
 895     mousekey_send();
 896 #endif
 897 #ifdef EXTRAKEY_ENABLE
 898     host_system_send(0);
 899     host_consumer_send(0);
 900 #endif
 901 }
 902
 903 bool sending_anykey(void)
 904 {
 905     return (host_has_anykey() || host_mouse_in_use() ||
 906             host_last_sysytem_report() || host_last_consumer_report());
 907 }
 908
 909 void layer_switch(uint8_t new_layer)
 910 {
 911     if (current_layer != new_layer) {
 912         debug("Layer Switch: "); debug_hex(current_layer);
 913         debug(" -> "); debug_hex(new_layer); debug("\n");
 914
 915         current_layer = new_layer;
 916         clear_keyboard_but_mods(); // To avoid stuck keys
 917         // NOTE: update mods with full scan of matrix? if modifier changes between layers
 918     }
 919 }
 920
 921 bool is_tap_key(key_t key)
 922 {
 923     action_t action = keymap_get_action(current_layer, key.pos.row, key.pos.col);
 924     switch (action.kind.id) {
 925         case ACT_LMODS_TAP:
 926         case ACT_RMODS_TAP:
 927             return true;
 928         case ACT_LAYER_PRESSED:
 929         case ACT_LAYER_BIT:
 930             switch (action.layer.code) {
 931                 case 0x00:
 932                 case 0xF1 ... 0xFF:
 933                     return false;
 934                 case 0xF0:
 935                 default:
 936                     return true;
 937             }
 938             return false;
 939         case ACT_FUNCTION:
 940             if (action.func.opt & 0x1) {
 941                 return true;
 942             }
 943             return false;
 944     }
 945     return false;
 946 }
 947
 948
 949 /*
 950  * debug print
 951  */
 952 static void debug_event(keyevent_t event)
 953 {
 954     debug_hex16(event.key.raw);
 955     if (event.pressed) debug("d("); else debug("u(");
 956     debug_dec(event.time); debug(")");
 957 }
 958 static void debug_record(keyrecord_t record)
 959 {
 960     debug_event(record.event); debug(":"); debug_dec(record.tap_count);
 961 }
 962 static void debug_action(action_t action)
 963 {
 964     switch (action.kind.id) {
 965         case ACT_LMODS:             debug("ACT_LMODS");             break;
 966         case ACT_RMODS:             debug("ACT_RMODS");             break;
 967         case ACT_LMODS_TAP:         debug("ACT_LMODS_TAP");         break;
 968         case ACT_RMODS_TAP:         debug("ACT_RMODS_TAP");         break;
 969         case ACT_USAGE:             debug("ACT_USAGE");             break;
 970         case ACT_MOUSEKEY:          debug("ACT_MOUSEKEY");          break;
 971         case ACT_LAYER_PRESSED:     debug("ACT_LAYER_PRESSED");     break;
 972         case ACT_LAYER_RELEASED:    debug("ACT_LAYER_RELEASED");    break;
 973         case ACT_LAYER_BIT:         debug("ACT_LAYER_BIT");         break;
 974         case ACT_LAYER_EXT:         debug("ACT_LAYER_EXT");         break;
 975         case ACT_MACRO:             debug("ACT_MACRO");             break;
 976         case ACT_COMMAND:           debug("ACT_COMMAND");           break;
 977         case ACT_FUNCTION:          debug("ACT_FUNCTION");          break;
 978         default:                    debug("UNKNOWN");               break;
 979     }
 980     debug("[");
 981     debug_hex4(action.kind.param>>8);
 982     debug(":");
 983     debug_hex8(action.kind.param & 0xff);
 984     debug("]");
 985 }
 986 static void debug_tapping_key(void)
 987 {
 988     debug("TAPPING_KEY="); debug_record(tapping_key); debug("\n");
 989 }
 990 static void debug_waiting_buffer(void)
 991 {
 992     debug("{ ");
 993     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 994         debug("["); debug_dec(i); debug("]="); debug_record(waiting_buffer[i]); debug(" ");
 995     }
 996     debug("}\n");
 997 }