qmk_firmware/quantum/process_keycode/process_autocorrect.c

306 lines
9.9 KiB
C

// Copyright 2021 Google LLC
// Copyright 2021 @filterpaper
// SPDX-License-Identifier: Apache-2.0
// Original source: https://getreuer.info/posts/keyboards/autocorrection
#include "process_autocorrect.h"
#include <string.h>
#include "keycode_config.h"
#if __has_include("autocorrect_data.h")
# include "autocorrect_data.h"
#else
# pragma message "Autocorrect is using the default library."
# include "autocorrect_data_default.h"
#endif
static uint8_t typo_buffer[AUTOCORRECT_MAX_LENGTH] = {KC_SPC};
static uint8_t typo_buffer_size = 1;
/**
* @brief function for querying the enabled state of autocorrect
*
* @return true if enabled
* @return false if disabled
*/
bool autocorrect_is_enabled(void) {
return keymap_config.autocorrect_enable;
}
/**
* @brief Enables autocorrect and saves state to eeprom
*
*/
void autocorrect_enable(void) {
keymap_config.autocorrect_enable = true;
eeconfig_update_keymap(keymap_config.raw);
}
/**
* @brief Disables autocorrect and saves state to eeprom
*
*/
void autocorrect_disable(void) {
keymap_config.autocorrect_enable = false;
typo_buffer_size = 0;
eeconfig_update_keymap(keymap_config.raw);
}
/**
* @brief Toggles autocorrect's status and save state to eeprom
*
*/
void autocorrect_toggle(void) {
keymap_config.autocorrect_enable = !keymap_config.autocorrect_enable;
typo_buffer_size = 0;
eeconfig_update_keymap(keymap_config.raw);
}
/**
* @brief handler for determining if autocorrect should process keypress
*
* @param keycode Keycode registered by matrix press, per keymap
* @param record keyrecord_t structure
* @param typo_buffer_size passed along to allow resetting of autocorrect buffer
* @param mods allow processing of mod status
* @return true Allow autocorection
* @return false Stop processing and escape from autocorrect.
*/
__attribute__((weak)) bool process_autocorrect_user(uint16_t *keycode, keyrecord_t *record, uint8_t *typo_buffer_size, uint8_t *mods) {
// See quantum_keycodes.h for reference on these matched ranges.
switch (*keycode) {
// Exclude these keycodes from processing.
case KC_LSFT:
case KC_RSFT:
case KC_CAPS:
case QK_TO ... QK_TO_MAX:
case QK_MOMENTARY ... QK_MOMENTARY_MAX:
case QK_DEF_LAYER ... QK_DEF_LAYER_MAX:
case QK_TOGGLE_LAYER ... QK_TOGGLE_LAYER_MAX:
case QK_ONE_SHOT_LAYER ... QK_ONE_SHOT_LAYER_MAX:
case QK_LAYER_TAP_TOGGLE ... QK_LAYER_TAP_TOGGLE_MAX:
case QK_LAYER_MOD ... QK_LAYER_MOD_MAX:
case QK_ONE_SHOT_MOD ... QK_ONE_SHOT_MOD_MAX:
return false;
// Mask for base keycode from shifted keys.
case QK_LSFT ... QK_LSFT + 255:
case QK_RSFT ... QK_RSFT + 255:
if (*keycode >= QK_LSFT && *keycode <= (QK_LSFT + 255)) {
*mods |= MOD_LSFT;
} else {
*mods |= MOD_RSFT;
}
*keycode = QK_MODS_GET_BASIC_KEYCODE(*keycode); // Get the basic keycode.
return true;
#ifndef NO_ACTION_TAPPING
// Exclude tap-hold keys when they are held down
// and mask for base keycode when they are tapped.
case QK_LAYER_TAP ... QK_LAYER_TAP_MAX:
# ifdef NO_ACTION_LAYER
// Exclude Layer Tap, if layers are disabled
// but action tapping is still enabled.
return false;
# else
// Exclude hold keycode
if (!record->tap.count) {
return false;
}
*keycode = QK_LAYER_TAP_GET_TAP_KEYCODE(*keycode);
break;
# endif
case QK_MOD_TAP ... QK_MOD_TAP_MAX:
// Exclude hold keycode
if (!record->tap.count) {
return false;
}
*keycode = QK_MOD_TAP_GET_TAP_KEYCODE(*keycode);
break;
#else
case QK_MOD_TAP ... QK_MOD_TAP_MAX:
case QK_LAYER_TAP ... QK_LAYER_TAP_MAX:
// Exclude if disabled
return false;
#endif
// Exclude swap hands keys when they are held down
// and mask for base keycode when they are tapped.
case QK_SWAP_HANDS ... QK_SWAP_HANDS_MAX:
#ifdef SWAP_HANDS_ENABLE
// Note: IS_SWAP_HANDS_KEYCODE() actually tests for the special action keycodes like SH_TOGG, SH_TT, ...,
// which currently overlap the SH_T(kc) range.
if (IS_SWAP_HANDS_KEYCODE(*keycode)
# ifndef NO_ACTION_TAPPING
|| !record->tap.count
# endif // NO_ACTION_TAPPING
) {
return false;
}
*keycode = QK_SWAP_HANDS_GET_TAP_KEYCODE(*keycode);
break;
#else
// Exclude if disabled
return false;
#endif
}
// Disable autocorrect while a mod other than shift is active.
if ((*mods & ~MOD_MASK_SHIFT) != 0) {
*typo_buffer_size = 0;
return false;
}
return true;
}
/**
* @brief handling for when autocorrection has been triggered
*
* @param backspaces number of characters to remove
* @param str pointer to PROGMEM string to replace mistyped seletion with
* @return true apply correction
* @return false user handled replacement
*/
__attribute__((weak)) bool apply_autocorrect(uint8_t backspaces, const char *str) {
return true;
}
/**
* @brief Process handler for autocorrect feature
*
* @param keycode Keycode registered by matrix press, per keymap
* @param record keyrecord_t structure
* @return true Continue processing keycodes, and send to host
* @return false Stop processing keycodes, and don't send to host
*/
bool process_autocorrect(uint16_t keycode, keyrecord_t *record) {
uint8_t mods = get_mods();
#ifndef NO_ACTION_ONESHOT
mods |= get_oneshot_mods();
#endif
if ((keycode >= QK_AUTOCORRECT_ON && keycode <= QK_AUTOCORRECT_TOGGLE) && record->event.pressed) {
if (keycode == QK_AUTOCORRECT_ON) {
autocorrect_enable();
} else if (keycode == QK_AUTOCORRECT_OFF) {
autocorrect_disable();
} else if (keycode == QK_AUTOCORRECT_TOGGLE) {
autocorrect_toggle();
} else {
return true;
}
return false;
}
if (!keymap_config.autocorrect_enable) {
typo_buffer_size = 0;
return true;
}
if (!record->event.pressed) {
return true;
}
// autocorrect keycode verification and extraction
if (!process_autocorrect_user(&keycode, record, &typo_buffer_size, &mods)) {
return true;
}
// keycode buffer check
switch (keycode) {
case KC_A ... KC_Z:
// process normally
break;
case KC_1 ... KC_0:
case KC_TAB ... KC_SEMICOLON:
case KC_GRAVE ... KC_SLASH:
// Set a word boundary if space, period, digit, etc. is pressed.
keycode = KC_SPC;
break;
case KC_ENTER:
// Behave more conservatively for the enter key. Reset, so that enter
// can't be used on a word ending.
typo_buffer_size = 0;
keycode = KC_SPC;
break;
case KC_BSPC:
// Remove last character from the buffer.
if (typo_buffer_size > 0) {
--typo_buffer_size;
}
return true;
case KC_QUOTE:
// Treat " (shifted ') as a word boundary.
if ((mods & MOD_MASK_SHIFT) != 0) {
keycode = KC_SPC;
}
break;
default:
// Clear state if some other non-alpha key is pressed.
typo_buffer_size = 0;
return true;
}
// Rotate oldest character if buffer is full.
if (typo_buffer_size >= AUTOCORRECT_MAX_LENGTH) {
memmove(typo_buffer, typo_buffer + 1, AUTOCORRECT_MAX_LENGTH - 1);
typo_buffer_size = AUTOCORRECT_MAX_LENGTH - 1;
}
// Append `keycode` to buffer.
typo_buffer[typo_buffer_size++] = keycode;
// Return if buffer is smaller than the shortest word.
if (typo_buffer_size < AUTOCORRECT_MIN_LENGTH) {
return true;
}
// Check for typo in buffer using a trie stored in `autocorrect_data`.
uint16_t state = 0;
uint8_t code = pgm_read_byte(autocorrect_data + state);
for (int8_t i = typo_buffer_size - 1; i >= 0; --i) {
uint8_t const key_i = typo_buffer[i];
if (code & 64) { // Check for match in node with multiple children.
code &= 63;
for (; code != key_i; code = pgm_read_byte(autocorrect_data + (state += 3))) {
if (!code) return true;
}
// Follow link to child node.
state = (pgm_read_byte(autocorrect_data + state + 1) | pgm_read_byte(autocorrect_data + state + 2) << 8);
// Check for match in node with single child.
} else if (code != key_i) {
return true;
} else if (!(code = pgm_read_byte(autocorrect_data + (++state)))) {
++state;
}
// Stop if `state` becomes an invalid index. This should not normally
// happen, it is a safeguard in case of a bug, data corruption, etc.
if (state >= DICTIONARY_SIZE) {
return true;
}
code = pgm_read_byte(autocorrect_data + state);
if (code & 128) { // A typo was found! Apply autocorrect.
const uint8_t backspaces = (code & 63) + !record->event.pressed;
if (apply_autocorrect(backspaces, (char const *)(autocorrect_data + state + 1))) {
for (uint8_t i = 0; i < backspaces; ++i) {
tap_code(KC_BSPC);
}
send_string_P((char const *)(autocorrect_data + state + 1));
}
if (keycode == KC_SPC) {
typo_buffer[0] = KC_SPC;
typo_buffer_size = 1;
return true;
} else {
typo_buffer_size = 0;
return false;
}
}
}
return true;
}