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kitty/glfw/xkb_glfw.c

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//========================================================================
// GLFW 3.4 XKB - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2018 Kovid Goyal <kovid@kovidgoyal.net>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include <string.h>
#include <stdlib.h>
#include "internal.h"
#include "xkb_glfw.h"
START_ALLOW_CASE_RANGE
#define debug(...) if (_glfw.hints.init.debugKeyboard) printf(__VA_ARGS__);
#define map_key(key) \
switch(key) { \
S(space, SPACE); \
S(apostrophe, APOSTROPHE); \
S(comma, COMMA); \
S(minus, MINUS); \
S(period, PERIOD); \
S(slash, SLASH); \
S(semicolon, SEMICOLON); \
S(equal, EQUAL); \
S(bracketleft, LEFT_BRACKET); \
S(backslash, BACKSLASH); \
S(bracketright, RIGHT_BRACKET); \
S(plus, PLUS); \
S(underscore, UNDERSCORE); \
S(grave, GRAVE_ACCENT); \
S(Escape, ESCAPE); \
S(Return, ENTER); \
S(Tab, TAB); \
S(BackSpace, BACKSPACE); \
S(Insert, INSERT); \
S(Delete, DELETE); \
S(Right, RIGHT); \
S(Left, LEFT); \
S(Up, UP); \
S(Down, DOWN); \
S(Page_Up, PAGE_UP); \
S(Page_Down, PAGE_DOWN); \
S(Home, HOME); \
S(End, END); \
S(Caps_Lock, CAPS_LOCK); \
S(Scroll_Lock, SCROLL_LOCK); \
S(Num_Lock, NUM_LOCK); \
S(Print, PRINT_SCREEN); \
S(Pause, PAUSE); \
S(KP_Decimal, KP_DECIMAL); \
S(KP_Divide, KP_DIVIDE); \
S(KP_Multiply, KP_MULTIPLY); \
S(KP_Subtract, KP_SUBTRACT); \
S(KP_Add, KP_ADD); \
S(KP_Enter, KP_ENTER); \
S(KP_Equal, KP_EQUAL); \
F(KP_Home, HOME); \
F(KP_End, END); \
F(KP_Page_Up, PAGE_UP); \
F(KP_Page_Down, PAGE_DOWN); \
F(KP_Insert, INSERT); \
F(KP_Delete, DELETE); \
S(Shift_L, LEFT_SHIFT); \
S(Control_L, LEFT_CONTROL); \
S(Alt_L, LEFT_ALT); \
S(Super_L, LEFT_SUPER); \
S(Shift_R, RIGHT_SHIFT); \
S(Control_R, RIGHT_CONTROL); \
S(Alt_R, RIGHT_ALT); \
S(Super_R, RIGHT_SUPER); \
S(Menu, MENU); \
R(0, 9, 0, 9); \
R(a, z, A, Z); \
D(A, Z, A, Z); \
R(F1, F25, F1, F25); \
R(KP_0, KP_9, KP_0, KP_9); \
static int
glfw_key_for_sym(xkb_keysym_t key) {
#define S(f, t) case XKB_KEY_##f: return GLFW_KEY_##t
#define F(f, t) S(f, t)
#define R(s, e, gs, ...) case XKB_KEY_##s ... XKB_KEY_##e: return GLFW_KEY_##gs + key - XKB_KEY_##s
#define D(s, e, gs, ...) R(s, e, gs, __VA_ARGS__)
map_key(key)
S(KP_Up, UP);
S(KP_Down, DOWN);
S(KP_Left, LEFT);
S(KP_Right, RIGHT);
default:
break;
}
return GLFW_KEY_UNKNOWN;
#undef F
#undef D
#undef R
#undef S
}
xkb_keysym_t
glfw_xkb_sym_for_key(int key) {
#define S(f, t) case GLFW_KEY_##t: return XKB_KEY_##f
#define F(...)
#define R(s, e, gs, ge) case GLFW_KEY_##gs ... GLFW_KEY_##ge: return XKB_KEY_##s + key - GLFW_KEY_##gs
#define D(...)
map_key(key)
default:
break;
}
return GLFW_KEY_UNKNOWN;
#undef F
#undef D
#undef R
#undef S
}
END_ALLOW_CASE_RANGE
#ifdef _GLFW_X11
bool
glfw_xkb_set_x11_events_mask(void) {
if (!XkbSelectEvents(_glfw.x11.display, XkbUseCoreKbd, XkbNewKeyboardNotifyMask | XkbMapNotifyMask | XkbStateNotifyMask, XkbNewKeyboardNotifyMask | XkbMapNotifyMask | XkbStateNotifyMask)) {
_glfwInputError(GLFW_PLATFORM_ERROR, "Failed to set XKB events mask");
return false;
}
return true;
}
bool
glfw_xkb_update_x11_keyboard_id(_GLFWXKBData *xkb) {
xkb->keyboard_device_id = -1;
xcb_connection_t* conn = XGetXCBConnection(_glfw.x11.display);
if (!conn) {
_glfwInputError(GLFW_PLATFORM_ERROR, "X11: Failed to retrieve XCB connection");
return false;
}
xkb->keyboard_device_id = xkb_x11_get_core_keyboard_device_id(conn);
if (xkb->keyboard_device_id == -1) {
_glfwInputError(GLFW_PLATFORM_ERROR, "X11: Failed to retrieve core keyboard device id");
return false;
}
return true;
}
#define xkb_glfw_load_keymap(keymap, ...) {\
xcb_connection_t* conn = XGetXCBConnection(_glfw.x11.display); \
if (conn) keymap = xkb_x11_keymap_new_from_device(xkb->context, conn, xkb->keyboard_device_id, XKB_KEYMAP_COMPILE_NO_FLAGS); \
}
#define xkb_glfw_load_state(keymap, state) {\
xcb_connection_t* conn = XGetXCBConnection(_glfw.x11.display); \
if (conn) state = xkb_x11_state_new_from_device(keymap, conn, xkb->keyboard_device_id); \
}
#else
#define xkb_glfw_load_keymap(keymap, map_str) keymap = xkb_keymap_new_from_string(xkb->context, map_str, XKB_KEYMAP_FORMAT_TEXT_V1, 0);
#define xkb_glfw_load_state(keymap, state) state = xkb_state_new(keymap);
#endif
static void
release_keyboard_data(_GLFWXKBData *xkb) {
#define US(group, state, unref) if (xkb->group.state) { unref(xkb->group.state); xkb->group.state = NULL; }
#define UK(keymap) if(xkb->keymap) { xkb_keymap_unref(xkb->keymap); xkb->keymap = NULL; }
US(states, composeState, xkb_compose_state_unref);
UK(keymap);
UK(default_keymap);
US(states, state, xkb_state_unref);
US(states, clean_state, xkb_state_unref);
US(states, default_state, xkb_state_unref);
#undef US
#undef UK
}
void
glfw_xkb_release(_GLFWXKBData *xkb) {
release_keyboard_data(xkb);
if (xkb->context) {
xkb_context_unref(xkb->context);
xkb->context = NULL;
}
glfw_ibus_terminate(&xkb->ibus);
}
bool
glfw_xkb_create_context(_GLFWXKBData *xkb) {
xkb->context = xkb_context_new(0);
if (!xkb->context)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Failed to initialize XKB context");
return false;
}
glfw_connect_to_ibus(&xkb->ibus);
return true;
}
static const char*
load_keymaps(_GLFWXKBData *xkb, const char *map_str) {
(void)(map_str); // not needed on X11
xkb_glfw_load_keymap(xkb->keymap, map_str);
if (!xkb->keymap) return "Failed to compile XKB keymap";
// The system default keymap, can be overridden by the XKB_DEFAULT_RULES
// env var, see
// https://xkbcommon.org/doc/current/structxkb__rule__names.html
static struct xkb_rule_names default_rule_names = {0};
xkb->default_keymap = xkb_keymap_new_from_names(xkb->context, &default_rule_names, XKB_KEYMAP_COMPILE_NO_FLAGS);
if (!xkb->default_keymap) return "Failed to create default XKB keymap";
return NULL;
}
static const char*
load_states(_GLFWXKBData *xkb) {
xkb_glfw_load_state(xkb->keymap, xkb->states.state);
xkb->states.clean_state = xkb_state_new(xkb->keymap);
xkb->states.default_state = xkb_state_new(xkb->default_keymap);
if (!xkb->states.state || !xkb->states.clean_state || !xkb->states.default_state) return "Failed to create XKB state";
return NULL;
}
static void
load_compose_tables(_GLFWXKBData *xkb) {
/* Look up the preferred locale, falling back to "C" as default. */
struct xkb_compose_table* compose_table = NULL;
const char *locale = getenv("LC_ALL");
if (!locale) locale = getenv("LC_CTYPE");
if (!locale) locale = getenv("LANG");
if (!locale) locale = "C";
compose_table = xkb_compose_table_new_from_locale(xkb->context, locale, XKB_COMPOSE_COMPILE_NO_FLAGS);
if (!compose_table) {
_glfwInputError(GLFW_PLATFORM_ERROR, "Failed to create XKB compose table for locale %s", locale);
return;
}
xkb->states.composeState = xkb_compose_state_new(compose_table, XKB_COMPOSE_STATE_NO_FLAGS);
if (!xkb->states.composeState) {
_glfwInputError(GLFW_PLATFORM_ERROR, "Failed to create XKB compose state");
}
xkb_compose_table_unref(compose_table);
}
bool
glfw_xkb_compile_keymap(_GLFWXKBData *xkb, const char *map_str) {
const char *err;
release_keyboard_data(xkb);
err = load_keymaps(xkb, map_str);
if (err) {
_glfwInputError(GLFW_PLATFORM_ERROR, "%s", err);
release_keyboard_data(xkb);
return false;
}
err = load_states(xkb);
if (err) {
_glfwInputError(GLFW_PLATFORM_ERROR, "%s", err);
release_keyboard_data(xkb);
return false;
}
load_compose_tables(xkb);
#define S(a, n) xkb->a##Idx = xkb_keymap_mod_get_index(xkb->keymap, n); xkb->a##Mask = 1 << xkb->a##Idx;
S(control, XKB_MOD_NAME_CTRL);
S(alt, XKB_MOD_NAME_ALT);
S(shift, XKB_MOD_NAME_SHIFT);
S(super, XKB_MOD_NAME_LOGO);
S(capsLock, XKB_MOD_NAME_CAPS);
S(numLock, XKB_MOD_NAME_NUM);
#undef S
size_t capacity = sizeof(xkb->unknownModifiers)/sizeof(xkb->unknownModifiers[0]), j = 0;
for (xkb_mod_index_t i = 0; i < capacity; i++) xkb->unknownModifiers[i] = XKB_MOD_INVALID;
for (xkb_mod_index_t i = 0; i < xkb_keymap_num_mods(xkb->keymap) && j < capacity - 1; i++) {
if (i != xkb->controlIdx && i != xkb->altIdx && i != xkb->shiftIdx && i != xkb->superIdx && i != xkb->capsLockIdx && i != xkb->numLockIdx) xkb->unknownModifiers[j++] = i;
}
xkb->states.modifiers = 0;
xkb->states.activeUnknownModifiers = 0;
return true;
}
static inline xkb_mod_mask_t
active_unknown_modifiers(_GLFWXKBData *xkb, struct xkb_state *state) {
size_t i = 0;
xkb_mod_mask_t ans = 0;
while (xkb->unknownModifiers[i] != XKB_MOD_INVALID) {
if (xkb_state_mod_index_is_active(state, xkb->unknownModifiers[i], XKB_STATE_MODS_EFFECTIVE)) ans |= (1 << xkb->unknownModifiers[i]);
i++;
}
return ans;
}
static void
update_modifiers(_GLFWXKBData *xkb, XKBStateGroup *group) {
#define S(attr, name) if (xkb_state_mod_index_is_active(group->state, xkb->attr##Idx, XKB_STATE_MODS_EFFECTIVE)) group->modifiers |= GLFW_MOD_##name
S(control, CONTROL); S(alt, ALT); S(shift, SHIFT); S(super, SUPER); S(capsLock, CAPS_LOCK); S(numLock, NUM_LOCK);
#undef S
xkb->states.activeUnknownModifiers = active_unknown_modifiers(xkb, xkb->states.state);
}
void
glfw_xkb_update_modifiers(_GLFWXKBData *xkb, xkb_mod_mask_t depressed, xkb_mod_mask_t latched, xkb_mod_mask_t locked, xkb_layout_index_t base_group, xkb_layout_index_t latched_group, xkb_layout_index_t locked_group) {
if (!xkb->keymap) return;
xkb->states.modifiers = 0;
xkb_state_update_mask(xkb->states.state, depressed, latched, locked, base_group, latched_group, locked_group);
// We have to update the groups in clean_state, as they change for
// different keyboard layouts, see https://github.com/kovidgoyal/kitty/issues/488
xkb_state_update_mask(xkb->states.clean_state, 0, 0, 0, base_group, latched_group, locked_group);
update_modifiers(xkb, &xkb->states);
}
bool
glfw_xkb_should_repeat(_GLFWXKBData *xkb, xkb_keycode_t scancode) {
#ifdef _GLFW_WAYLAND
scancode += 8;
#endif
return xkb_keymap_key_repeats(xkb->keymap, scancode);
}
static KeyEvent key_event = {0};
static inline xkb_keysym_t
compose_symbol(struct xkb_compose_state *composeState, xkb_keysym_t sym, int *compose_completed) {
*compose_completed = 0;
if (sym == XKB_KEY_NoSymbol || !composeState) return sym;
if (xkb_compose_state_feed(composeState, sym) != XKB_COMPOSE_FEED_ACCEPTED) return sym;
switch (xkb_compose_state_get_status(composeState)) {
case XKB_COMPOSE_COMPOSED:
xkb_compose_state_get_utf8(composeState, key_event.text, sizeof(key_event.text));
*compose_completed = 1;
return xkb_compose_state_get_one_sym(composeState);
case XKB_COMPOSE_COMPOSING:
case XKB_COMPOSE_CANCELLED:
return XKB_KEY_NoSymbol;
case XKB_COMPOSE_NOTHING:
default:
return sym;
}
}
const char*
glfw_xkb_keysym_name(xkb_keysym_t sym) {
static char name[256];
name[0] = 0;
xkb_keysym_get_name(sym, name, sizeof(name));
return name;
}
int
glfw_xkb_keysym_from_name(const char *name, bool case_sensitive) {
return (int)xkb_keysym_from_name(name, case_sensitive ? XKB_KEYSYM_NO_FLAGS : XKB_KEYSYM_CASE_INSENSITIVE);
}
static inline const char*
format_mods(unsigned int mods) {
static char buf[128];
char *p = buf, *s;
#define pr(x) p += snprintf(p, sizeof(buf) - (p - buf) - 1, "%s", x)
pr("mods: ");
s = p;
if (mods & GLFW_MOD_CONTROL) pr("ctrl+");
if (mods & GLFW_MOD_ALT) pr("alt+");
if (mods & GLFW_MOD_SHIFT) pr("shift+");
if (mods & GLFW_MOD_SUPER) pr("super+");
if (mods & GLFW_MOD_CAPS_LOCK) pr("capslock+");
if (mods & GLFW_MOD_NUM_LOCK) pr("numlock+");
if (p == s) pr("none");
else p--;
pr(" ");
#undef pr
return buf;
}
static inline const char*
format_xkb_mods(_GLFWXKBData *xkb, const char* name, xkb_mod_mask_t mods) {
static char buf[512];
char *p = buf, *s;
#define pr(x) p += snprintf(p, sizeof(buf) - (p - buf) - 1, "%s", x)
pr(name); pr(": ");
s = p;
for (xkb_mod_index_t i = 0; i < xkb_keymap_num_mods(xkb->keymap); i++) {
xkb_mod_mask_t m = 1 << i;
if (m & mods) { pr(xkb_keymap_mod_get_name(xkb->keymap, i)); pr("+"); }
}
if (p == s) pr("none");
else p--;
pr(" ");
#undef pr
return buf;
}
void
glfw_xkb_update_ime_state(_GLFWwindow *w, _GLFWXKBData *xkb, int which, int a, int b, int c, int d) {
int x = 0, y = 0;
switch(which) {
case 1:
glfw_ibus_set_focused(&xkb->ibus, a ? true : false);
break;
case 2:
_glfwPlatformGetWindowPos(w, &x, &y);
x += a; y += b;
glfw_ibus_set_cursor_geometry(&xkb->ibus, x, y, c, d);
break;
}
}
void
glfw_xkb_key_from_ime(KeyEvent *ev, bool handled_by_ime, bool failed) {
_GLFWwindow *window = _glfwWindowForId(ev->window_id);
if (failed && window && window->callbacks.keyboard) {
// notify application to remove any existing pre-edit text
window->callbacks.keyboard((GLFWwindow*) window, GLFW_KEY_UNKNOWN, 0, GLFW_PRESS, 0, "", 1);
}
static xkb_keycode_t last_handled_press_keycode = 0;
// We filter out release events that correspond to the last press event
// handled by the IME system. This wont fix the case of multiple key
// presses before a release, but is better than nothing. For that case
// you'd need to implement a ring buffer to store pending key presses.
xkb_keycode_t prev_handled_press = last_handled_press_keycode;
last_handled_press_keycode = 0;
bool is_release = ev->action == GLFW_RELEASE;
debug("From IBUS: scancode: 0x%x name: %s is_release: %d\n", ev->keycode, glfw_xkb_keysym_name(ev->keysym), is_release);
if (window && !handled_by_ime && !(is_release && ev->keycode == prev_handled_press)) {
debug("↳ to application: glfw_keycode: 0x%x (%s) keysym: 0x%x (%s) action: %s %s text: %s\n",
ev->glfw_keycode, _glfwGetKeyName(ev->glfw_keycode), ev->keysym, glfw_xkb_keysym_name(ev->keysym),
(ev->action == GLFW_RELEASE ? "RELEASE" : (ev->action == GLFW_PRESS ? "PRESS" : "REPEAT")),
format_mods(ev->glfw_modifiers), ev->text
);
_glfwInputKeyboard(window, ev->glfw_keycode, ev->keysym, ev->action, ev->glfw_modifiers, ev->text, 0);
} else debug("↳ discarded\n");
if (!is_release && handled_by_ime) last_handled_press_keycode = ev->keycode;
}
void
glfw_xkb_handle_key_event(_GLFWwindow *window, _GLFWXKBData *xkb, xkb_keycode_t scancode, int action) {
const xkb_keysym_t *syms, *clean_syms, *default_syms;
xkb_keysym_t glfw_sym;
xkb_keycode_t code_for_sym = scancode;
key_event.ibus_keycode = scancode;
#ifdef _GLFW_WAYLAND
code_for_sym += 8;
#else
key_event.ibus_keycode -= 8;
#endif
debug("%s scancode: 0x%x ", action == GLFW_RELEASE ? "Release" : "Press", scancode);
XKBStateGroup *sg = &xkb->states;
int num_syms = xkb_state_key_get_syms(sg->state, code_for_sym, &syms);
int num_clean_syms = xkb_state_key_get_syms(sg->clean_state, code_for_sym, &clean_syms);
key_event.text[0] = 0;
// According to the documentation of xkb_compose_state_feed it does not
// support multi-sym events, so we ignore them
if (num_syms != 1 || num_clean_syms != 1) {
debug("num_syms: %d num_clean_syms: %d ignoring event\n", num_syms, num_clean_syms);
return;
}
glfw_sym = clean_syms[0];
debug("clean_sym: %s ", glfw_xkb_keysym_name(clean_syms[0]));
if (action == GLFW_PRESS || action == GLFW_REPEAT) {
const char *text_type = "composed_text";
int compose_completed;
glfw_sym = compose_symbol(sg->composeState, syms[0], &compose_completed);
if (glfw_sym == XKB_KEY_NoSymbol && !compose_completed) {
debug("compose not complete, ignoring.\n");
return;
}
debug("composed_sym: %s ", glfw_xkb_keysym_name(glfw_sym));
if (glfw_sym == syms[0]) { // composed sym is the same as non-composed sym
// Only use the clean_sym if no mods other than the mods we report
// are active (for example if ISO_Shift_Level_* mods are active
// they are not reported by GLFW so the key should be the shifted
// key). See https://github.com/kovidgoyal/kitty/issues/171#issuecomment-377557053
xkb_mod_mask_t consumed_unknown_mods = xkb_state_key_get_consumed_mods(sg->state, code_for_sym) & sg->activeUnknownModifiers;
if (sg->activeUnknownModifiers) debug("%s", format_xkb_mods(xkb, "active_unknown_mods", sg->activeUnknownModifiers));
if (consumed_unknown_mods) { debug("%s", format_xkb_mods(xkb, "consumed_unknown_mods", consumed_unknown_mods)); }
else glfw_sym = clean_syms[0];
// xkb returns text even if alt and/or super are pressed
if ( ((GLFW_MOD_CONTROL | GLFW_MOD_ALT | GLFW_MOD_SUPER) & sg->modifiers) == 0) xkb_state_key_get_utf8(sg->state, code_for_sym, key_event.text, sizeof(key_event.text));
text_type = "text";
}
if ((1 <= key_event.text[0] && key_event.text[0] <= 31) || key_event.text[0] == 127) key_event.text[0] = 0; // don't send text for ascii control codes
if (key_event.text[0]) { debug("%s: %s ", text_type, key_event.text); }
}
int glfw_keycode = glfw_key_for_sym(glfw_sym);
bool is_fallback = false;
if (glfw_keycode == GLFW_KEY_UNKNOWN && !key_event.text[0]) {
int num_default_syms = xkb_state_key_get_syms(sg->default_state, code_for_sym, &default_syms);
if (num_default_syms > 0) {
glfw_sym = default_syms[0];
glfw_keycode = glfw_key_for_sym(glfw_sym);
is_fallback = true;
}
}
debug(
"%s%s: %d (%s) xkb_key: %d (%s)\n",
format_mods(sg->modifiers),
is_fallback ? "glfw_fallback_key" : "glfw_key", glfw_keycode, _glfwGetKeyName(glfw_keycode),
glfw_sym, glfw_xkb_keysym_name(glfw_sym)
);
key_event.action = action; key_event.glfw_modifiers = sg->modifiers;
key_event.keycode = scancode; key_event.keysym = glfw_sym;
key_event.window_id = window->id; key_event.glfw_keycode = glfw_keycode;
key_event.ibus_sym = syms[0];
if (ibus_process_key(&key_event, &xkb->ibus)) {
debug("↳ to IBUS: keycode: 0x%x keysym: 0x%x (%s) %s\n", key_event.ibus_keycode, key_event.ibus_sym, glfw_xkb_keysym_name(key_event.ibus_sym), format_mods(key_event.glfw_modifiers));
} else {
_glfwInputKeyboard(window, glfw_keycode, glfw_sym, action, sg->modifiers, key_event.text, 0);
}
}
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