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 #include "layer_stack.h"
  28
  29
  30 /* default layer indicates base layer */
  31 uint8_t default_layer = 0;
  32 /* current layer indicates active layer at this time */
  33 uint8_t current_layer = 0;
  34
  35
  36 static void process_action(keyrecord_t *record);
  37 static bool process_tapping(keyrecord_t *record);
  38 static void waiting_buffer_scan_tap(void);
  39
  40 static void debug_event(keyevent_t event);
  41 static void debug_record(keyrecord_t record);
  42 static void debug_action(action_t action);
  43 static void debug_tapping_key(void);
  44 static void debug_waiting_buffer(void);
  45
  46
  47 /*
  48  * Tapping
  49  */
  50 /* period of tapping(ms) */
  51 #ifndef TAPPING_TERM
  52 #define TAPPING_TERM    200
  53 #endif
  54
  55 /* tap count needed for toggling a feature */
  56 #ifndef TAPPING_TOGGLE
  57 #define TAPPING_TOGGLE  5
  58 #endif
  59
  60 /* stores a key event of current tap. */
  61 static keyrecord_t tapping_key = {};
  62
  63 #define IS_TAPPING()            !IS_NOEVENT(tapping_key.event)
  64 #define IS_TAPPING_PRESSED()    (IS_TAPPING() && tapping_key.event.pressed)
  65 #define IS_TAPPING_RELEASED()   (IS_TAPPING() && !tapping_key.event.pressed)
  66 #define IS_TAPPING_KEY(k)       (IS_TAPPING() && KEYEQ(tapping_key.event.key, (k)))
  67 #define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < TAPPING_TERM)
  68
  69
  70 /*
  71  * Waiting buffer
  72  *
  73  * stores key events waiting for settling current tap.
  74  */
  75 #define WAITING_BUFFER_SIZE 8
  76 static keyrecord_t waiting_buffer[WAITING_BUFFER_SIZE] = {};
  77
  78 /* point to empty cell to enq */
  79 static uint8_t waiting_buffer_head = 0;
  80
  81 /* point to the oldest data cell to deq */
  82 static uint8_t waiting_buffer_tail = 0;
  83
  84 static bool waiting_buffer_enq(keyrecord_t record)
  85 {
  86     if (IS_NOEVENT(record.event)) {
  87         return true;
  88     }
  89
  90     if ((waiting_buffer_head + 1) % WAITING_BUFFER_SIZE == waiting_buffer_tail) {
  91         debug("waiting_buffer_enq: Over flow.\n");
  92         return false;
  93     }
  94
  95     waiting_buffer[waiting_buffer_head] = record;
  96     waiting_buffer_head = (waiting_buffer_head + 1) % WAITING_BUFFER_SIZE;
  97
  98     debug("waiting_buffer_enq: "); debug_waiting_buffer();
  99     return true;
 100 }
 101
 102 static void waiting_buffer_clear(void)
 103 {
 104     waiting_buffer_head = 0;
 105     waiting_buffer_tail = 0;
 106 }
 107
 108 #if TAPPING_TERM >= 500
 109 static bool waiting_buffer_typed(keyevent_t event)
 110 {
 111     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 112         if (KEYEQ(event.key, waiting_buffer[i].event.key) && event.pressed !=  waiting_buffer[i].event.pressed) {
 113             return true;
 114         }
 115     }
 116     return false;
 117 }
 118 #endif
 119
 120 bool waiting_buffer_has_anykey_pressed(void)
 121 {
 122     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 123         if (waiting_buffer[i].event.pressed) return true;
 124     }
 125     return false;
 126 }
 127
 128
 129 /* Oneshot modifier
 130  *
 131  * Problem: Want to capitalize like 'The' but the result tends to be 'THe'.
 132  * Solution: Oneshot modifier have its effect on only one key coming next.
 133  *           Tap Shift, then type 't', 'h' and 'e'. Not need to hold Shift key.
 134  *
 135  *  Hold:       works as normal modifier.
 136  *  Tap:        one shot modifier.
 137  *  2 Tap:      cancel one shot modifier.
 138  *  5-Tap:      toggles enable/disable oneshot feature.
 139  */
 140 static struct {
 141     uint8_t mods;
 142     uint8_t time;
 143     bool    ready;
 144     bool    disabled;
 145 }   oneshot_state;
 146
 147 static void oneshot_start(uint8_t mods, uint16_t time)
 148 {
 149     oneshot_state.mods = mods;
 150     oneshot_state.time = time;
 151     oneshot_state.ready = true;
 152 }
 153
 154 static void oneshot_cancel(void)
 155 {
 156     oneshot_state.mods = 0;
 157     oneshot_state.time = 0;
 158     oneshot_state.ready = false;
 159 }
 160
 161 static void oneshot_toggle(void)
 162 {
 163     oneshot_state.disabled = !oneshot_state.disabled;
 164 }
 165
 166
 167
 168 void action_exec(keyevent_t event)
 169 {
 170     if (!IS_NOEVENT(event)) {
 171         debug("\n---- action_exec: start -----\n");
 172         debug("EVENT: "); debug_event(event); debug("\n");
 173     }
 174
 175     keyrecord_t record = { .event = event };
 176
 177     // pre-process on tapping
 178     if (process_tapping(&record)) {
 179         if (!IS_NOEVENT(record.event)) {
 180             debug("processed: "); debug_record(record); debug("\n");
 181         }
 182     } else {
 183         // enqueue
 184         if (!waiting_buffer_enq(record)) {
 185             // clear all in case of overflow.
 186             debug("OVERFLOW: CLEAR ALL STATES\n");
 187             clear_keyboard();
 188             waiting_buffer_clear();
 189             tapping_key = (keyrecord_t){};
 190         }
 191     }
 192
 193     // process waiting_buffer
 194     if (!IS_NOEVENT(event) && waiting_buffer_head != waiting_buffer_tail) {
 195         debug("---- action_exec: process waiting_buffer -----\n");
 196     }
 197
 198     for (; waiting_buffer_tail != waiting_buffer_head; waiting_buffer_tail = (waiting_buffer_tail + 1) % WAITING_BUFFER_SIZE) {
 199         if (process_tapping(&waiting_buffer[waiting_buffer_tail])) {
 200             debug("processed: waiting_buffer["); debug_dec(waiting_buffer_tail); debug("] = ");
 201             debug_record(waiting_buffer[waiting_buffer_tail]); debug("\n\n");
 202         } else {
 203             break;
 204         }
 205     }
 206     if (!IS_NOEVENT(event)) {
 207         debug("\n");
 208     }
 209 }
 210
 211 static action_t get_action(key_t key)
 212 {
 213     action_t action;
 214     action.code = ACTION_NO;
 215
 216     /* layer stack */
 217     action = layer_stack_get_action(key);
 218     if (action.code != ACTION_TRANSPARENT) {
 219         return action;
 220     }
 221
 222     /* current layer: 0 means default layer */
 223     if (current_layer) {
 224         action = action_for_key(current_layer, key);
 225         if (action.code != ACTION_TRANSPARENT) {
 226             debug("current layer: used. "); debug_dec(current_layer); debug("\n");
 227             return action;
 228         }
 229     }
 230
 231     /* default layer */
 232     debug("default layer: used. \n");
 233     action = action_for_key(default_layer, key);
 234     return action;
 235 }
 236
 237 static void process_action(keyrecord_t *record)
 238 {
 239     keyevent_t event = record->event;
 240     uint8_t tap_count = record->tap_count;
 241
 242     if (IS_NOEVENT(event)) { return; }
 243
 244     action_t action = get_action(event.key);
 245     debug("ACTION: "); debug_action(action); debug("\n");
 246
 247     switch (action.kind.id) {
 248         /* Key and Mods */
 249         case ACT_LMODS:
 250         case ACT_RMODS:
 251             {
 252                 uint8_t mods = (action.kind.id == ACT_LMODS) ?  action.key.mods :
 253                                                                 action.key.mods<<4;
 254                 if (event.pressed) {
 255                     uint8_t tmp_mods = host_get_mods();
 256                     if (mods) {
 257                         host_add_mods(mods);
 258                         host_send_keyboard_report();
 259                     }
 260                     register_code(action.key.code);
 261                     if (mods && action.key.code) {
 262                         host_set_mods(tmp_mods);
 263                         host_send_keyboard_report();
 264                     }
 265                 } else {
 266                     if (mods && !action.key.code) {
 267                         host_del_mods(mods);
 268                         host_send_keyboard_report();
 269                     }
 270                     unregister_code(action.key.code);
 271                 }
 272             }
 273             break;
 274         case ACT_LMODS_TAP:
 275         case ACT_RMODS_TAP:
 276             {
 277                 uint8_t mods = (action.kind.id == ACT_LMODS_TAP) ?  action.key.mods :
 278                                                                     action.key.mods<<4;
 279                 switch (action.layer.code) {
 280                     case 0x00:
 281                         // Oneshot modifier
 282                         if (event.pressed) {
 283                             if (tap_count == 0) {
 284                                 debug("MODS_TAP: Oneshot: add_mods\n");
 285                                 add_mods(mods);
 286                             }
 287                             else if (tap_count == 1) {
 288                                 debug("MODS_TAP: Oneshot: start\n");
 289                                 oneshot_start(mods, event.time);
 290                             }
 291                             else if (tap_count == TAPPING_TOGGLE) {
 292                                 debug("MODS_TAP: Oneshot: toggle\n");
 293                                 oneshot_toggle();
 294                             }
 295                             else {
 296                                 debug("MODS_TAP: Oneshot: cancel&add_mods\n");
 297                                 // double tap cancels oneshot and works as normal modifier.
 298                                 oneshot_cancel();
 299                                 add_mods(mods);
 300                             }
 301                         } else {
 302                             if (tap_count == 0) {
 303                                 debug("MODS_TAP: Oneshot: cancel/del_mods\n");
 304                                 // cancel oneshot on hold
 305                                 oneshot_cancel();
 306                                 del_mods(mods);
 307                             }
 308                             else if (tap_count == 1) {
 309                                 debug("MODS_TAP: Oneshot: del_mods\n");
 310                                 // retain Oneshot
 311                                 del_mods(mods);
 312                             }
 313                             else {
 314                                 debug("MODS_TAP: Oneshot: del_mods\n");
 315                                 // cancel Mods
 316                                 del_mods(mods);
 317                             }
 318                         }
 319                         break;
 320                     default:
 321                         if (event.pressed) {
 322                             if (tap_count > 0) {
 323                                 if (waiting_buffer_has_anykey_pressed()) {
 324                                     debug("MODS_TAP: Tap: Cancel: add_mods\n");
 325                                     // ad hoc: set 0 to cancel tap
 326                                     record->tap_count = 0;
 327                                     add_mods(mods);
 328                                 } else {
 329                                     debug("MODS_TAP: Tap: register_code\n");
 330                                     register_code(action.key.code);
 331                                 }
 332                             } else {
 333                                 debug("MODS_TAP: No tap: add_mods\n");
 334                                 add_mods(mods);
 335                             }
 336                         } else {
 337                             if (tap_count > 0) {
 338                                 debug("MODS_TAP: Tap: unregister_code\n");
 339                                 unregister_code(action.key.code);
 340                             } else {
 341                                 debug("MODS_TAP: No tap: add_mods\n");
 342                                 del_mods(mods);
 343                             }
 344                         }
 345                         break;
 346                 }
 347             }
 348             break;
 349
 350         /* other HID usage */
 351         case ACT_USAGE:
 352 #ifdef EXTRAKEY_ENABLE
 353             switch (action.usage.page) {
 354                 case PAGE_SYSTEM:
 355                     if (event.pressed) {
 356                         host_system_send(action.usage.code);
 357                     } else {
 358                         host_system_send(0);
 359                     }
 360                     break;
 361                 case PAGE_CONSUMER:
 362                     if (event.pressed) {
 363                         host_consumer_send(action.usage.code);
 364                     } else {
 365                         host_consumer_send(0);
 366                     }
 367                     break;
 368             }
 369 #endif
 370             break;
 371
 372         /* Mouse key */
 373         case ACT_MOUSEKEY:
 374 #ifdef MOUSEKEY_ENABLE
 375             if (event.pressed) {
 376                 mousekey_on(action.key.code);
 377                 mousekey_send();
 378             } else {
 379                 mousekey_off(action.key.code);
 380                 mousekey_send();
 381             }
 382 #endif
 383             break;
 384
 385         /* Layer key */
 386         case ACT_LAYER:
 387             switch (action.layer.code) {
 388                 case LAYER_MOMENTARY:  /* momentary */
 389                     if (event.pressed) {
 390                         layer_switch(action.layer.val);
 391                     }
 392                     else {
 393                         // NOTE: This is needed by legacy keymap support
 394                         layer_switch(0);
 395                     }
 396                     break;
 397                 case LAYER_ON_PRESS:
 398                     if (event.pressed) {
 399                         layer_switch(action.layer.val);
 400                     }
 401                     break;
 402                 case LAYER_ON_RELEASE:
 403                     if (!event.pressed) {
 404                         layer_switch(action.layer.val);
 405                     }
 406                     break;
 407                 case LAYER_ON_BOTH:
 408                     layer_switch(action.layer.val);
 409                     break;
 410                 case LAYER_TAP_TOGGLE:  /* switch on hold and toggle on several taps */
 411                     if (event.pressed) {
 412                         if (tap_count < TAPPING_TOGGLE) {
 413                             layer_switch(action.layer.val);
 414                         }
 415                     } else {
 416                         if (tap_count >= TAPPING_TOGGLE) {
 417                             debug("LAYER_PRESSED: tap toggle.\n");
 418                             layer_switch(action.layer.val);
 419                         }
 420                     }
 421                     break;
 422                 case LAYER_SET_DEFAULT_ON_PRESS:
 423                     if (event.pressed) {
 424                         default_layer = action.layer.val;
 425                         layer_switch(0);
 426                     }
 427                     break;
 428                 case LAYER_SET_DEFAULT_ON_RELEASE:
 429                     if (!event.pressed) {
 430                         default_layer = action.layer.val;
 431                         layer_switch(0);
 432                     }
 433                     break;
 434                 case LAYER_SET_DEFAULT_ON_BOTH:
 435                     default_layer = action.layer.val;
 436                     layer_switch(0);
 437                     break;
 438                 default:
 439                     /* tap key */
 440                     if (event.pressed) {
 441                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 442                              debug("LAYER_SET: Tap: register_code\n");
 443                              register_code(action.layer.code);
 444                         } else {
 445                              debug("LAYER_SET: No tap: layer_set(on press)\n");
 446                              layer_switch(action.layer.val);
 447                         }
 448                     } else {
 449                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 450                             debug("LAYER_SET: Tap: unregister_code\n");
 451                             unregister_code(action.layer.code);
 452                         } else {
 453                             // NOTE: This is needed by legacy keymap support
 454                             debug("LAYER_SET: No tap: return to default layer(on release)\n");
 455                             layer_switch(0);
 456                         }
 457                     }
 458                     break;
 459             }
 460             break;
 461         case ACT_LAYER_BIT:
 462             switch (action.layer.code) {
 463                 case LAYER_MOMENTARY:  /* momentary */
 464                     if (event.pressed) {
 465                         layer_switch(current_layer | action.layer.val);
 466                     } else {
 467                         layer_switch(current_layer & ~action.layer.val);
 468                     }
 469                     break;
 470                 case LAYER_ON_PRESS:
 471                     if (event.pressed) {
 472                         layer_switch(current_layer ^ action.layer.val);
 473                     }
 474                     break;
 475                 case LAYER_ON_RELEASE:
 476                     if (!event.pressed) {
 477                         layer_switch(current_layer ^ action.layer.val);
 478                     }
 479                     break;
 480                 case LAYER_ON_BOTH:
 481                     layer_switch(current_layer ^ action.layer.val);
 482                     break;
 483                 case LAYER_TAP_TOGGLE:  /* switch on hold and toggle on several taps */
 484                     if (event.pressed) {
 485                         if (tap_count < TAPPING_TOGGLE) {
 486                             debug("LAYER_BIT: tap toggle(press).\n");
 487                             layer_switch(current_layer ^ action.layer.val);
 488                         }
 489                     } else {
 490                         if (tap_count <= TAPPING_TOGGLE) {
 491                             debug("LAYER_BIT: tap toggle(release).\n");
 492                             layer_switch(current_layer ^ action.layer.val);
 493                         }
 494                     }
 495                     break;
 496                 case LAYER_SET_DEFAULT_ON_PRESS:
 497                     if (event.pressed) {
 498                         default_layer = default_layer ^ action.layer.val;
 499                         layer_switch(0);
 500                     }
 501                     break;
 502                 case LAYER_SET_DEFAULT_ON_RELEASE:
 503                     if (!event.pressed) {
 504                         default_layer = default_layer ^ action.layer.val;
 505                         layer_switch(0);
 506                     }
 507                     break;
 508                 case LAYER_SET_DEFAULT_ON_BOTH:
 509                     default_layer = default_layer ^ action.layer.val;
 510                     layer_switch(0);
 511                     break;
 512                 default:
 513                     // tap key
 514                     if (event.pressed) {
 515                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 516                             debug("LAYER_BIT: Tap: register_code\n");
 517                             register_code(action.layer.code);
 518                         } else {
 519                             debug("LAYER_BIT: No tap: layer_bit(on press)\n");
 520                             layer_switch(current_layer ^ action.layer.val);
 521                         }
 522                     } else {
 523                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 524                             debug("LAYER_BIT: Tap: unregister_code\n");
 525                             unregister_code(action.layer.code);
 526                         } else {
 527                             debug("LAYER_BIT: No tap: layer_bit(on release)\n");
 528                             layer_switch(current_layer ^ action.layer.val);
 529                         }
 530                     }
 531                     break;
 532             }
 533             break;
 534         case ACT_LAYER_STACK:
 535             switch (action.layer.code) {
 536                 case LAYER_MOMENTARY:  /* momentary */
 537                     if (event.pressed) {
 538                         layer_stack_remove_then_push(action.layer.val);
 539                         layer_stack_debug();
 540                     } else {
 541                         layer_stack_remove(action.layer.val);
 542                         layer_stack_debug();
 543                     }
 544                     break;
 545                 case LAYER_ON_PRESS:
 546                     if (event.pressed) {
 547                         layer_stack_remove_or_push(action.layer.val);
 548                         layer_stack_debug();
 549                     }
 550                     break;
 551                 case LAYER_ON_RELEASE:
 552                     if (!event.pressed) {
 553                         layer_stack_remove_or_push(action.layer.val);
 554                         layer_stack_debug();
 555                     }
 556                     break;
 557                 case LAYER_ON_BOTH:
 558                     layer_stack_remove_or_push(action.layer.val);
 559                     layer_stack_debug();
 560                     break;
 561                 case LAYER_TAP_TOGGLE:  /* switch on hold and toggle on several taps */
 562                     if (event.pressed) {
 563                         if (tap_count < TAPPING_TOGGLE) {
 564                             debug("LAYER_STACK: tap toggle(press).\n");
 565                             layer_stack_remove_or_push(action.layer.val);
 566                             layer_stack_debug();
 567                         }
 568                     } else {
 569                         if (tap_count <= TAPPING_TOGGLE) {
 570                             debug("LAYER_STACK: tap toggle(release).\n");
 571                             layer_stack_remove_or_push(action.layer.val);
 572                             layer_stack_debug();
 573                         }
 574                     }
 575                     break;
 576                 default:
 577                     // tap key
 578                     if (event.pressed) {
 579                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 580                             debug("LAYER_STACK: Tap: register_code\n");
 581                             register_code(action.layer.code);
 582                         } else {
 583                             debug("LAYER_STACK: No tap: layer_stack(on press)\n");
 584                             layer_stack_remove_or_push(action.layer.val);
 585                             layer_stack_debug();
 586                         }
 587                     } else {
 588                         if (IS_TAPPING_KEY(event.key) && tap_count > 0) {
 589                             debug("LAYER_STACK: Tap: unregister_code\n");
 590                             unregister_code(action.layer.code);
 591                         } else {
 592                             debug("LAYER_STACK: No tap: layer_stack(on release)\n");
 593                             layer_stack_remove_or_push(action.layer.val);
 594                             layer_stack_debug();
 595                         }
 596                     }
 597                     break;
 598             }
 599             break;
 600
 601         /* Extentions */
 602         case ACT_MACRO:
 603             // TODO
 604             break;
 605         case ACT_COMMAND:
 606             break;
 607         case ACT_FUNCTION:
 608             action_function(record, action.func.id, action.func.opt);
 609             break;
 610         default:
 611             break;
 612     }
 613 }
 614
 615 /* Tapping
 616  *
 617  * Rule: Tap key is typed(pressed and released) within TAPPING_TERM.
 618  *       (without interfering by typing other key)
 619  */
 620 /* return true when key event is processed or consumed. */
 621 static bool process_tapping(keyrecord_t *keyp)
 622 {
 623     keyevent_t event = keyp->event;
 624
 625     // if tapping
 626     if (IS_TAPPING_PRESSED()) {
 627         if (WITHIN_TAPPING_TERM(event)) {
 628             if (tapping_key.tap_count == 0) {
 629                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 630                     // first tap!
 631                     debug("Tapping: First tap(0->1).\n");
 632                     tapping_key.tap_count = 1;
 633                     debug_tapping_key();
 634                     process_action(&tapping_key);
 635
 636                     // enqueue
 637                     keyp->tap_count = tapping_key.tap_count;
 638                     return false;
 639                 }
 640 #if TAPPING_TERM >= 500
 641                 /* This can prevent from typing some tap keys in a row at a time. */
 642                 else if (!event.pressed && waiting_buffer_typed(event)) {
 643                     // other key typed. not tap.
 644                     debug("Tapping: End. No tap. Interfered by typing key\n");
 645                     process_action(&tapping_key);
 646                     tapping_key = (keyrecord_t){};
 647                     debug_tapping_key();
 648
 649                     // enqueue
 650                     return false;
 651                 }
 652 #endif
 653                 else {
 654                     // other key events shall be enq'd till tapping state settles.
 655                     return false;
 656                 }
 657             }
 658             // tap_count > 0
 659             else {
 660                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 661                     debug("Tapping: Tap release("); debug_dec(tapping_key.tap_count); debug(")\n");
 662                     keyp->tap_count = tapping_key.tap_count;
 663                     process_action(keyp);
 664                     tapping_key = *keyp;
 665                     debug_tapping_key();
 666                     return true;
 667                 }
 668                 else if (is_tap_key(keyp->event.key) && event.pressed) {
 669                     if (tapping_key.tap_count > 1) {
 670                         debug("Tapping: Start new tap with releasing last tap(>1).\n");
 671                         // unregister key
 672                         process_action(&(keyrecord_t){
 673                                 .tap_count = tapping_key.tap_count,
 674                                 .event.key = tapping_key.event.key,
 675                                 .event.time = event.time,
 676                                 .event.pressed = false
 677                         });
 678                     } else {
 679                         debug("Tapping: Start while last tap(1).\n");
 680                     }
 681                     tapping_key = *keyp;
 682                     waiting_buffer_scan_tap();
 683                     debug_tapping_key();
 684                     return true;
 685                 }
 686                 else {
 687                     if (!IS_NOEVENT(keyp->event)) {
 688                         debug("Tapping: key event while last tap(>0).\n");
 689                     }
 690                     process_action(keyp);
 691                     return true;
 692                 }
 693             }
 694         }
 695         // after TAPPING_TERM
 696         else {
 697             if (tapping_key.tap_count == 0) {
 698                 debug("Tapping: End. Timeout. Not tap(0): ");
 699                 debug_event(event); debug("\n");
 700                 process_action(&tapping_key);
 701                 tapping_key = (keyrecord_t){};
 702                 debug_tapping_key();
 703                 return false;
 704             }  else {
 705                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 706                     debug("Tapping: End. last timeout tap release(>0).");
 707                     keyp->tap_count = tapping_key.tap_count;
 708                     process_action(keyp);
 709                     tapping_key = (keyrecord_t){};
 710                     return true;
 711                 }
 712                 else if (is_tap_key(keyp->event.key) && event.pressed) {
 713                     if (tapping_key.tap_count > 1) {
 714                         debug("Tapping: Start new tap with releasing last timeout tap(>1).\n");
 715                         // unregister key
 716                         process_action(&(keyrecord_t){
 717                                 .tap_count = tapping_key.tap_count,
 718                                 .event.key = tapping_key.event.key,
 719                                 .event.time = event.time,
 720                                 .event.pressed = false
 721                         });
 722                     } else {
 723                         debug("Tapping: Start while last timeout tap(1).\n");
 724                     }
 725                     tapping_key = *keyp;
 726                     waiting_buffer_scan_tap();
 727                     debug_tapping_key();
 728                     return true;
 729                 }
 730                 else {
 731                     if (!IS_NOEVENT(keyp->event)) {
 732                         debug("Tapping: key event while last timeout tap(>0).\n");
 733                     }
 734                     process_action(keyp);
 735                     return true;
 736                 }
 737             }
 738         }
 739     } else if (IS_TAPPING_RELEASED()) {
 740         if (WITHIN_TAPPING_TERM(event)) {
 741             if (tapping_key.tap_count > 0 && IS_TAPPING_KEY(event.key) && event.pressed) {
 742                 // sequential tap.
 743                 keyp->tap_count = tapping_key.tap_count + 1;
 744                 debug("Tapping: Tap press("); debug_dec(keyp->tap_count); debug(")\n");
 745                 process_action(keyp);
 746                 tapping_key = *keyp;
 747                 debug_tapping_key();
 748                 return true;
 749             } else if (event.pressed && is_tap_key(event.key)) {
 750                 // Sequential tap can be interfered with other tap key.
 751                 debug("Tapping: Start with interfering other tap.\n");
 752                 tapping_key = *keyp;
 753                 waiting_buffer_scan_tap();
 754                 debug_tapping_key();
 755                 return true;
 756             } else {
 757                 if (!IS_NOEVENT(keyp->event)) debug("Tapping: other key just after tap.\n");
 758                 process_action(keyp);
 759                 return true;
 760             }
 761         } else {
 762             // timeout. no sequential tap.
 763             debug("Tapping: End(Timeout after releasing last tap): ");
 764             debug_event(event); debug("\n");
 765             tapping_key = (keyrecord_t){};
 766             debug_tapping_key();
 767             return false;
 768         }
 769     }
 770     // not tapping satate
 771     else {
 772         if (event.pressed && is_tap_key(event.key)) {
 773             debug("Tapping: Start(Press tap key).\n");
 774             tapping_key = *keyp;
 775             waiting_buffer_scan_tap();
 776             debug_tapping_key();
 777             return true;
 778         } else {
 779             process_action(keyp);
 780             return true;
 781         }
 782     }
 783 }
 784
 785 /* scan buffer for tapping */
 786 static void waiting_buffer_scan_tap(void)
 787 {
 788     // tapping already is settled
 789     if (tapping_key.tap_count > 0) return;
 790     // invalid state: tapping_key released && tap_count == 0
 791     if (!tapping_key.event.pressed) return;
 792
 793     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 794         if (IS_TAPPING_KEY(waiting_buffer[i].event.key) &&
 795                 !waiting_buffer[i].event.pressed &&
 796                 WITHIN_TAPPING_TERM(waiting_buffer[i].event)) {
 797             tapping_key.tap_count = 1;
 798             waiting_buffer[i].tap_count = 1;
 799             process_action(&tapping_key);
 800
 801             debug("waiting_buffer_scan_tap: found at ["); debug_dec(i); debug("]\n");
 802             debug_waiting_buffer();
 803             return;
 804         }
 805     }
 806 }
 807
 808
 809
 810 /*
 811  * Utilities for actions.
 812  */
 813 void register_code(uint8_t code)
 814 {
 815     if (code == KC_NO) {
 816         return;
 817     }
 818     else if IS_KEY(code) {
 819         // TODO: should push command_proc out of this block?
 820         if (command_proc(code)) return;
 821
 822         if (oneshot_state.mods && oneshot_state.ready && !oneshot_state.disabled) {
 823             uint8_t tmp_mods = host_get_mods();
 824             host_add_mods(oneshot_state.mods);
 825             host_add_key(code);
 826             host_send_keyboard_report();
 827
 828             host_set_mods(tmp_mods);
 829             oneshot_state.ready = false;
 830         } else {
 831             host_add_key(code);
 832             host_send_keyboard_report();
 833         }
 834     }
 835     else if IS_MOD(code) {
 836         host_add_mods(MOD_BIT(code));
 837         host_send_keyboard_report();
 838     }
 839 }
 840
 841 void unregister_code(uint8_t code)
 842 {
 843     if IS_KEY(code) {
 844         host_del_key(code);
 845         host_send_keyboard_report();
 846     }
 847     else if IS_MOD(code) {
 848         host_del_mods(MOD_BIT(code));
 849         host_send_keyboard_report();
 850     }
 851 }
 852
 853 void add_mods(uint8_t mods)
 854 {
 855     if (mods) {
 856         host_add_mods(mods);
 857         host_send_keyboard_report();
 858     }
 859 }
 860
 861 void del_mods(uint8_t mods)
 862 {
 863     if (mods) {
 864         host_del_mods(mods);
 865         host_send_keyboard_report();
 866     }
 867 }
 868
 869 void set_mods(uint8_t mods)
 870 {
 871     host_set_mods(mods);
 872     host_send_keyboard_report();
 873 }
 874
 875 void clear_keyboard(void)
 876 {
 877     host_clear_mods();
 878     clear_keyboard_but_mods();
 879 }
 880
 881 void clear_keyboard_but_mods(void)
 882 {
 883     host_clear_keys();
 884     host_send_keyboard_report();
 885 #ifdef MOUSEKEY_ENABLE
 886     mousekey_clear();
 887     mousekey_send();
 888 #endif
 889 #ifdef EXTRAKEY_ENABLE
 890     host_system_send(0);
 891     host_consumer_send(0);
 892 #endif
 893 }
 894
 895 bool sending_anykey(void)
 896 {
 897     return (host_has_anykey() || host_mouse_in_use() ||
 898             host_last_sysytem_report() || host_last_consumer_report());
 899 }
 900
 901 void layer_switch(uint8_t new_layer)
 902 {
 903     if (current_layer != new_layer) {
 904         debug("Layer Switch: "); debug_hex(current_layer);
 905         debug(" -> "); debug_hex(new_layer); debug("\n");
 906
 907         current_layer = new_layer;
 908         clear_keyboard_but_mods(); // To avoid stuck keys
 909         // NOTE: update mods with full scan of matrix? if modifier changes between layers
 910     }
 911 }
 912
 913 bool is_tap_key(key_t key)
 914 {
 915     action_t action = get_action(key);
 916
 917     switch (action.kind.id) {
 918         case ACT_LMODS_TAP:
 919         case ACT_RMODS_TAP:
 920             return true;
 921         case ACT_LAYER:
 922         case ACT_LAYER_BIT:
 923             switch (action.layer.code) {
 924                 case LAYER_MOMENTARY:
 925                 case LAYER_ON_PRESS:
 926                 case LAYER_ON_RELEASE:
 927                 case LAYER_ON_BOTH:
 928                 case LAYER_SET_DEFAULT_ON_PRESS:
 929                 case LAYER_SET_DEFAULT_ON_RELEASE:
 930                 case LAYER_SET_DEFAULT_ON_BOTH:
 931                     return false;
 932                 case LAYER_TAP_TOGGLE:
 933                 default:    /* tap key */
 934                     return true;
 935             }
 936             return false;
 937         case ACT_FUNCTION:
 938             if (action.func.opt & FUNC_TAP) { return true; }
 939             return false;
 940     }
 941     return false;
 942 }
 943
 944
 945 /*
 946  * debug print
 947  */
 948 static void debug_event(keyevent_t event)
 949 {
 950     debug_hex16((event.key.row<<8) | event.key.col);
 951     if (event.pressed) debug("d("); else debug("u(");
 952     debug_dec(event.time); debug(")");
 953 }
 954 static void debug_record(keyrecord_t record)
 955 {
 956     debug_event(record.event); debug(":"); debug_dec(record.tap_count);
 957 }
 958 static void debug_action(action_t action)
 959 {
 960     switch (action.kind.id) {
 961         case ACT_LMODS:             debug("ACT_LMODS");             break;
 962         case ACT_RMODS:             debug("ACT_RMODS");             break;
 963         case ACT_LMODS_TAP:         debug("ACT_LMODS_TAP");         break;
 964         case ACT_RMODS_TAP:         debug("ACT_RMODS_TAP");         break;
 965         case ACT_USAGE:             debug("ACT_USAGE");             break;
 966         case ACT_MOUSEKEY:          debug("ACT_MOUSEKEY");          break;
 967         case ACT_LAYER:             debug("ACT_LAYER");             break;
 968         case ACT_LAYER_BIT:         debug("ACT_LAYER_BIT");         break;
 969         case ACT_LAYER_STACK:       debug("ACT_LAYER_STACK");       break;
 970         case ACT_MACRO:             debug("ACT_MACRO");             break;
 971         case ACT_COMMAND:           debug("ACT_COMMAND");           break;
 972         case ACT_FUNCTION:          debug("ACT_FUNCTION");          break;
 973         default:                    debug("UNKNOWN");               break;
 974     }
 975     debug("[");
 976     debug_hex4(action.kind.param>>8);
 977     debug(":");
 978     debug_hex8(action.kind.param & 0xff);
 979     debug("]");
 980 }
 981 static void debug_tapping_key(void)
 982 {
 983     debug("TAPPING_KEY="); debug_record(tapping_key); debug("\n");
 984 }
 985 static void debug_waiting_buffer(void)
 986 {
 987     debug("{ ");
 988     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 989         debug("["); debug_dec(i); debug("]="); debug_record(waiting_buffer[i]); debug(" ");
 990     }
 991     debug("}\n");
 992 }