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libxkbcommon/src/state.c

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/************************************************************
* Copyright (c) 1993 by Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of Silicon Graphics not be
* used in advertising or publicity pertaining to distribution
* of the software without specific prior written permission.
* Silicon Graphics makes no representation about the suitability
* of this software for any purpose. It is provided "as is"
* without any express or implied warranty.
*
* SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH
* THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
********************************************************/
/*
* Copyright © 2012 Intel Corporation
* Copyright © 2012 Ran Benita <ran234@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Author: Daniel Stone <daniel@fooishbar.org>
*/
/*
* This is a bastardised version of xkbActions.c from the X server which
* does not support, for the moment:
* - AccessX sticky/debounce/etc (will come later)
* - pointer keys (may come later)
* - key redirects (unlikely)
* - messages (very unlikely)
*/
#include "keymap.h"
#include "keysym.h"
#include "utf8.h"
struct xkb_filter {
union xkb_action action;
const struct xkb_key *key;
uint32_t priv;
bool (*func)(struct xkb_state *state,
struct xkb_filter *filter,
const struct xkb_key *key,
enum xkb_key_direction direction);
int refcnt;
};
struct state_components {
/* These may be negative, because of -1 group actions. */
int32_t base_group; /**< depressed */
int32_t latched_group;
int32_t locked_group;
xkb_layout_index_t group; /**< effective */
xkb_mod_mask_t base_mods; /**< depressed */
xkb_mod_mask_t latched_mods;
xkb_mod_mask_t locked_mods;
xkb_mod_mask_t mods; /**< effective */
xkb_led_mask_t leds;
};
struct xkb_state {
/*
* Before updating the state, we keep a copy of just this struct. This
* allows us to report which components of the state have changed.
*/
struct state_components components;
/*
* At each event, we accumulate all the needed modifications to the base
* modifiers, and apply them at the end. These keep track of this state.
*/
xkb_mod_mask_t set_mods;
xkb_mod_mask_t clear_mods;
/*
* We mustn't clear a base modifier if there's another depressed key
* which affects it, e.g. given this sequence
* < Left Shift down, Right Shift down, Left Shift Up >
* the modifier should still be set. This keeps the count.
*/
int16_t mod_key_count[XKB_MAX_MODS];
int refcnt;
darray(struct xkb_filter) filters;
struct xkb_keymap *keymap;
};
static const struct xkb_key_type_entry *
get_entry_for_key_state(struct xkb_state *state, const struct xkb_key *key,
xkb_layout_index_t group)
{
const struct xkb_key_type *type = key->groups[group].type;
xkb_mod_mask_t active_mods = state->components.mods & type->mods.mask;
for (unsigned i = 0; i < type->num_entries; i++) {
/*
* If the virtual modifiers are not bound to anything, we're
* supposed to skip the entry (xserver does this with cached
* entry->active field).
*/
if (type->entries[i].mods.mods != 0 && type->entries[i].mods.mask == 0)
continue;
if (type->entries[i].mods.mask == active_mods)
return &type->entries[i];
}
return NULL;
}
/**
* Returns the level to use for the given key and state, or
* XKB_LEVEL_INVALID.
*/
XKB_EXPORT xkb_level_index_t
xkb_state_key_get_level(struct xkb_state *state, xkb_keycode_t kc,
xkb_layout_index_t layout)
{
const struct xkb_key *key = XkbKey(state->keymap, kc);
const struct xkb_key_type_entry *entry;
if (!key || layout >= key->num_groups)
return XKB_LEVEL_INVALID;
/* If we don't find an explicit match the default is 0. */
entry = get_entry_for_key_state(state, key, layout);
if (!entry)
return 0;
return entry->level;
}
xkb_layout_index_t
XkbWrapGroupIntoRange(int32_t group,
xkb_layout_index_t num_groups,
enum xkb_range_exceed_type out_of_range_group_action,
xkb_layout_index_t out_of_range_group_number)
{
if (num_groups == 0)
return XKB_LAYOUT_INVALID;
if (group >= 0 && (xkb_layout_index_t) group < num_groups)
return group;
switch (out_of_range_group_action) {
case RANGE_REDIRECT:
if (out_of_range_group_number >= num_groups)
return 0;
return out_of_range_group_number;
case RANGE_SATURATE:
if (group < 0)
return 0;
else
return num_groups - 1;
case RANGE_WRAP:
default:
/*
* C99 says a negative dividend in a modulo operation always
* gives a negative result.
*/
if (group < 0)
return ((int) num_groups + (group % (int) num_groups));
else
return group % num_groups;
}
}
/**
* Returns the layout to use for the given key and state, taking
* wrapping/clamping/etc into account, or XKB_LAYOUT_INVALID.
*/
XKB_EXPORT xkb_layout_index_t
xkb_state_key_get_layout(struct xkb_state *state, xkb_keycode_t kc)
{
const struct xkb_key *key = XkbKey(state->keymap, kc);
if (!key)
return XKB_LAYOUT_INVALID;
return XkbWrapGroupIntoRange(state->components.group, key->num_groups,
key->out_of_range_group_action,
key->out_of_range_group_number);
}
static const union xkb_action fake = { .type = ACTION_TYPE_NONE };
static const union xkb_action *
xkb_key_get_action(struct xkb_state *state, const struct xkb_key *key)
{
xkb_layout_index_t layout;
xkb_level_index_t level;
layout = xkb_state_key_get_layout(state, key->keycode);
if (layout == XKB_LAYOUT_INVALID)
return &fake;
level = xkb_state_key_get_level(state, key->keycode, layout);
if (level == XKB_LEVEL_INVALID)
return &fake;
return &key->groups[layout].levels[level].action;
}
static struct xkb_filter *
xkb_filter_new(struct xkb_state *state)
{
struct xkb_filter *filter = NULL, *iter;
darray_foreach(iter, state->filters) {
if (iter->func)
continue;
filter = iter;
break;
}
if (!filter) {
darray_resize0(state->filters, darray_size(state->filters) + 1);
filter = &darray_item(state->filters, darray_size(state->filters) -1);
}
filter->refcnt = 1;
return filter;
}
/***====================================================================***/
static bool
xkb_filter_group_set_func(struct xkb_state *state,
struct xkb_filter *filter,
const struct xkb_key *key,
enum xkb_key_direction direction)
{
if (key != filter->key) {
filter->action.group.flags &= ~ACTION_LOCK_CLEAR;
return true;
}
if (direction == XKB_KEY_DOWN) {
filter->refcnt++;
return false;
}
else if (--filter->refcnt > 0) {
return false;
}
state->components.base_group = filter->priv;
if (filter->action.group.flags & ACTION_LOCK_CLEAR)
state->components.locked_group = 0;
filter->func = NULL;
return true;
}
static void
xkb_filter_group_set_new(struct xkb_state *state, struct xkb_filter *filter)
{
filter->priv = state->components.base_group;
if (filter->action.group.flags & ACTION_ABSOLUTE_SWITCH)
state->components.base_group = filter->action.group.group;
else
state->components.base_group += filter->action.group.group;
}
static bool
xkb_filter_group_lock_func(struct xkb_state *state,
struct xkb_filter *filter,
const struct xkb_key *key,
enum xkb_key_direction direction)
{
if (key != filter->key)
return true;
if (direction == XKB_KEY_DOWN) {
filter->refcnt++;
return false;
}
if (--filter->refcnt > 0)
return false;
filter->func = NULL;
return true;
}
static void
xkb_filter_group_lock_new(struct xkb_state *state, struct xkb_filter *filter)
{
if (filter->action.group.flags & ACTION_ABSOLUTE_SWITCH)
state->components.locked_group = filter->action.group.group;
else
state->components.locked_group += filter->action.group.group;
}
static bool
xkb_filter_mod_set_func(struct xkb_state *state,
struct xkb_filter *filter,
const struct xkb_key *key,
enum xkb_key_direction direction)
{
if (key != filter->key) {
filter->action.mods.flags &= ~ACTION_LOCK_CLEAR;
return true;
}
if (direction == XKB_KEY_DOWN) {
filter->refcnt++;
return false;
}
else if (--filter->refcnt > 0) {
return false;
}
state->clear_mods = filter->action.mods.mods.mask;
if (filter->action.mods.flags & ACTION_LOCK_CLEAR)
state->components.locked_mods &= ~filter->action.mods.mods.mask;
filter->func = NULL;
return true;
}
static void
xkb_filter_mod_set_new(struct xkb_state *state, struct xkb_filter *filter)
{
state->set_mods = filter->action.mods.mods.mask;
}
static bool
xkb_filter_mod_lock_func(struct xkb_state *state,
struct xkb_filter *filter,
const struct xkb_key *key,
enum xkb_key_direction direction)
{
if (key != filter->key)
return true;
if (direction == XKB_KEY_DOWN) {
filter->refcnt++;
return false;
}
if (--filter->refcnt > 0)
return false;
state->clear_mods |= filter->action.mods.mods.mask;
if (!(filter->action.mods.flags & ACTION_LOCK_NO_UNLOCK))
state->components.locked_mods &= ~filter->priv;
filter->func = NULL;
return true;
}
static void
xkb_filter_mod_lock_new(struct xkb_state *state, struct xkb_filter *filter)
{
filter->priv = (state->components.locked_mods &
filter->action.mods.mods.mask);
state->set_mods |= filter->action.mods.mods.mask;
if (!(filter->action.mods.flags & ACTION_LOCK_NO_LOCK))
state->components.locked_mods |= filter->action.mods.mods.mask;
}
enum xkb_key_latch_state {
NO_LATCH,
LATCH_KEY_DOWN,
LATCH_PENDING,
};
static bool
xkb_action_breaks_latch(const union xkb_action *action)
{
switch (action->type) {
case ACTION_TYPE_NONE:
case ACTION_TYPE_PTR_BUTTON:
case ACTION_TYPE_PTR_LOCK:
case ACTION_TYPE_CTRL_SET:
case ACTION_TYPE_CTRL_LOCK:
case ACTION_TYPE_SWITCH_VT:
case ACTION_TYPE_TERMINATE:
return true;
default:
return false;
}
}
static bool
xkb_filter_mod_latch_func(struct xkb_state *state,
struct xkb_filter *filter,
const struct xkb_key *key,
enum xkb_key_direction direction)
{
enum xkb_key_latch_state latch = filter->priv;
if (direction == XKB_KEY_DOWN && latch == LATCH_PENDING) {
/* If this is a new keypress and we're awaiting our single latched
* keypress, then either break the latch if any random key is pressed,
* or promote it to a lock or plain base set if it's the same
* modifier. */
const union xkb_action *action = xkb_key_get_action(state, key);
if (action->type == ACTION_TYPE_MOD_LATCH &&
action->mods.flags == filter->action.mods.flags &&
action->mods.mods.mask == filter->action.mods.mods.mask) {
filter->action = *action;
if (filter->action.mods.flags & ACTION_LATCH_TO_LOCK) {
filter->action.type = ACTION_TYPE_MOD_LOCK;
filter->func = xkb_filter_mod_lock_func;
state->components.locked_mods |= filter->action.mods.mods.mask;
}
else {
filter->action.type = ACTION_TYPE_MOD_SET;
filter->func = xkb_filter_mod_set_func;
state->set_mods = filter->action.mods.mods.mask;
}
filter->key = key;
state->components.latched_mods &= ~filter->action.mods.mods.mask;
/* XXX beep beep! */
return false;
}
else if (xkb_action_breaks_latch(action)) {
/* XXX: This may be totally broken, we might need to break the
* latch in the next run after this press? */
state->components.latched_mods &= ~filter->action.mods.mods.mask;
filter->func = NULL;
return true;
}
}
else if (direction == XKB_KEY_UP && key == filter->key) {
/* Our key got released. If we've set it to clear locks, and we
* currently have the same modifiers locked, then release them and
* don't actually latch. Else we've actually hit the latching
* stage, so set PENDING and move our modifier from base to
* latched. */
if (latch == NO_LATCH ||
((filter->action.mods.flags & ACTION_LOCK_CLEAR) &&
(state->components.locked_mods & filter->action.mods.mods.mask) ==
filter->action.mods.mods.mask)) {
/* XXX: We might be a bit overenthusiastic about clearing
* mods other filters have set here? */
if (latch == LATCH_PENDING)
state->components.latched_mods &=
~filter->action.mods.mods.mask;
else
state->clear_mods = filter->action.mods.mods.mask;
state->components.locked_mods &= ~filter->action.mods.mods.mask;
filter->func = NULL;
}
else {
latch = LATCH_PENDING;
state->clear_mods = filter->action.mods.mods.mask;
state->components.latched_mods |= filter->action.mods.mods.mask;
/* XXX beep beep! */
}
}
else if (direction == XKB_KEY_DOWN && latch == LATCH_KEY_DOWN) {
/* Someone's pressed another key while we've still got the latching
* key held down, so keep the base modifier state active (from
* xkb_filter_mod_latch_new), but don't trip the latch, just clear
* it as soon as the modifier gets released. */
latch = NO_LATCH;
}
filter->priv = latch;
return true;
}
static void
xkb_filter_mod_latch_new(struct xkb_state *state, struct xkb_filter *filter)
{
filter->priv = LATCH_KEY_DOWN;
state->set_mods = filter->action.mods.mods.mask;
}
static const struct {
void (*new)(struct xkb_state *state, struct xkb_filter *filter);
bool (*func)(struct xkb_state *state, struct xkb_filter *filter,
const struct xkb_key *key, enum xkb_key_direction direction);
} filter_action_funcs[_ACTION_TYPE_NUM_ENTRIES] = {
[ACTION_TYPE_MOD_SET] = { xkb_filter_mod_set_new,
xkb_filter_mod_set_func },
[ACTION_TYPE_MOD_LATCH] = { xkb_filter_mod_latch_new,
xkb_filter_mod_latch_func },
[ACTION_TYPE_MOD_LOCK] = { xkb_filter_mod_lock_new,
xkb_filter_mod_lock_func },
[ACTION_TYPE_GROUP_SET] = { xkb_filter_group_set_new,
xkb_filter_group_set_func },
[ACTION_TYPE_GROUP_LOCK] = { xkb_filter_group_lock_new,
xkb_filter_group_lock_func },
};
/**
* Applies any relevant filters to the key, first from the list of filters
* that are currently active, then if no filter has claimed the key, possibly
* apply a new filter from the key action.
*/
static void
xkb_filter_apply_all(struct xkb_state *state,
const struct xkb_key *key,
enum xkb_key_direction direction)
{
struct xkb_filter *filter;
const union xkb_action *action;
bool send = true;
/* First run through all the currently active filters and see if any of
* them have claimed this event. */
darray_foreach(filter, state->filters) {
if (!filter->func)
continue;
send = filter->func(state, filter, key, direction) && send;
}
if (!send || direction == XKB_KEY_UP)
return;
action = xkb_key_get_action(state, key);
/*
* It's possible for the keymap to set action->type explicitly, like so:
* interpret XF86_Next_VMode {
* action = Private(type=0x86, data="+VMode");
* };
* We don't handle those.
*/
if (action->type >= _ACTION_TYPE_NUM_ENTRIES)
return;
if (!filter_action_funcs[action->type].new)
return;
filter = xkb_filter_new(state);
if (!filter)
return; /* WSGO */
filter->key = key;
filter->func = filter_action_funcs[action->type].func;
filter->action = *action;
filter_action_funcs[action->type].new(state, filter);
}
XKB_EXPORT struct xkb_state *
xkb_state_new(struct xkb_keymap *keymap)
{
struct xkb_state *ret;
ret = calloc(sizeof(*ret), 1);
if (!ret)
return NULL;
ret->refcnt = 1;
ret->keymap = xkb_keymap_ref(keymap);
return ret;
}
XKB_EXPORT struct xkb_state *
xkb_state_ref(struct xkb_state *state)
{
state->refcnt++;
return state;
}
XKB_EXPORT void
xkb_state_unref(struct xkb_state *state)
{
if (!state || --state->refcnt > 0)
return;
xkb_keymap_unref(state->keymap);
darray_free(state->filters);
free(state);
}
XKB_EXPORT struct xkb_keymap *
xkb_state_get_keymap(struct xkb_state *state)
{
return state->keymap;
}
/**
* Update the LED state to match the rest of the xkb_state.
*/
static void
xkb_state_led_update_all(struct xkb_state *state)
{
xkb_led_index_t idx;
const struct xkb_led *led;
state->components.leds = 0;
xkb_leds_enumerate(idx, led, state->keymap) {
xkb_mod_mask_t mod_mask = 0;
xkb_layout_mask_t group_mask = 0;
if (led->which_mods != 0 && led->mods.mask != 0) {
if (led->which_mods & XKB_STATE_MODS_EFFECTIVE)
mod_mask |= state->components.mods;
if (led->which_mods & XKB_STATE_MODS_DEPRESSED)
mod_mask |= state->components.base_mods;
if (led->which_mods & XKB_STATE_MODS_LATCHED)
mod_mask |= state->components.latched_mods;
if (led->which_mods & XKB_STATE_MODS_LOCKED)
mod_mask |= state->components.locked_mods;
if (led->mods.mask & mod_mask) {
state->components.leds |= (1u << idx);
continue;
}
}
if (led->which_groups != 0 && led->groups != 0) {
if (led->which_groups & XKB_STATE_LAYOUT_EFFECTIVE)
group_mask |= (1u << state->components.group);
if (led->which_groups & XKB_STATE_LAYOUT_DEPRESSED)
group_mask |= (1u << state->components.base_group);
if (led->which_groups & XKB_STATE_LAYOUT_LATCHED)
group_mask |= (1u << state->components.latched_group);
if (led->which_groups & XKB_STATE_LAYOUT_LOCKED)
group_mask |= (1u << state->components.locked_group);
if (led->groups & group_mask) {
state->components.leds |= (1u << idx);
continue;
}
}
if (led->ctrls & state->keymap->enabled_ctrls) {
state->components.leds |= (1u << idx);
continue;
}
}
}
/**
* Calculates the derived state (effective mods/group and LEDs) from an
* up-to-date xkb_state.
*/
static void
xkb_state_update_derived(struct xkb_state *state)
{
xkb_layout_index_t wrapped;
state->components.mods = (state->components.base_mods |
state->components.latched_mods |
state->components.locked_mods);
/* TODO: Use groups_wrap control instead of always RANGE_WRAP. */
wrapped = XkbWrapGroupIntoRange(state->components.locked_group,
state->keymap->num_groups,
RANGE_WRAP, 0);
state->components.locked_group =
(wrapped == XKB_LAYOUT_INVALID ? 0 : wrapped);
wrapped = XkbWrapGroupIntoRange(state->components.base_group +
state->components.latched_group +
state->components.locked_group,
state->keymap->num_groups,
RANGE_WRAP, 0);
state->components.group =
(wrapped == XKB_LAYOUT_INVALID ? 0 : wrapped);
xkb_state_led_update_all(state);
}
static enum xkb_state_component
get_state_component_changes(const struct state_components *a,
const struct state_components *b)
{
xkb_mod_mask_t mask = 0;
if (a->group != b->group)
mask |= XKB_STATE_LAYOUT_EFFECTIVE;
if (a->base_group != b->base_group)
mask |= XKB_STATE_LAYOUT_DEPRESSED;
if (a->latched_group != b->latched_group)
mask |= XKB_STATE_LAYOUT_LATCHED;
if (a->locked_group != b->locked_group)
mask |= XKB_STATE_LAYOUT_LOCKED;
if (a->mods != b->mods)
mask |= XKB_STATE_MODS_EFFECTIVE;
if (a->base_mods != b->base_mods)
mask |= XKB_STATE_MODS_DEPRESSED;
if (a->latched_mods != b->latched_mods)
mask |= XKB_STATE_MODS_LATCHED;
if (a->locked_mods != b->locked_mods)
mask |= XKB_STATE_MODS_LOCKED;
if (a->leds != b->leds)
mask |= XKB_STATE_LEDS;
return mask;
}
/**
* Given a particular key event, updates the state structure to reflect the
* new modifiers.
*/
XKB_EXPORT enum xkb_state_component
xkb_state_update_key(struct xkb_state *state, xkb_keycode_t kc,
enum xkb_key_direction direction)
{
xkb_mod_index_t i;
xkb_mod_mask_t bit;
struct state_components prev_components;
const struct xkb_key *key = XkbKey(state->keymap, kc);
if (!key)
return 0;
prev_components = state->components;
state->set_mods = 0;
state->clear_mods = 0;
xkb_filter_apply_all(state, key, direction);
for (i = 0, bit = 1; state->set_mods; i++, bit <<= 1) {
if (state->set_mods & bit) {
state->mod_key_count[i]++;
state->components.base_mods |= bit;
state->set_mods &= ~bit;
}
}
for (i = 0, bit = 1; state->clear_mods; i++, bit <<= 1) {
if (state->clear_mods & bit) {
state->mod_key_count[i]--;
if (state->mod_key_count[i] <= 0) {
state->components.base_mods &= ~bit;
state->mod_key_count[i] = 0;
}
state->clear_mods &= ~bit;
}
}
xkb_state_update_derived(state);
return get_state_component_changes(&prev_components, &state->components);
}
/**
* Updates the state from a set of explicit masks as gained from
* xkb_state_serialize_mods and xkb_state_serialize_groups. As noted in the
* documentation for these functions in xkbcommon.h, this round-trip is
* lossy, and should only be used to update a slave state mirroring the
* master, e.g. in a client/server window system.
*/
XKB_EXPORT enum xkb_state_component
xkb_state_update_mask(struct xkb_state *state,
xkb_mod_mask_t base_mods,
xkb_mod_mask_t latched_mods,
xkb_mod_mask_t locked_mods,
xkb_layout_index_t base_group,
xkb_layout_index_t latched_group,
xkb_layout_index_t locked_group)
{
struct state_components prev_components;
xkb_mod_mask_t mask;
prev_components = state->components;
/* Only include modifiers which exist in the keymap. */
mask = (xkb_mod_mask_t) ((1ull << xkb_keymap_num_mods(state->keymap)) - 1u);
state->components.base_mods = base_mods & mask;
state->components.latched_mods = latched_mods & mask;
state->components.locked_mods = locked_mods & mask;
/* Make sure the mods are fully resolved - since we get arbitrary
* input, they might not be.
*
* It might seem more reasonable to do this only for components.mods
* in xkb_state_update_derived(), rather than for each component
* seperately. That would allow to distinguish between "really"
* depressed mods (would be in MODS_DEPRESSED) and indirectly
* depressed to to a mapping (would only be in MODS_EFFECTIVE).
* However, the traditional behavior of xkb_state_update_key() is that
* if a vmod is depressed, its mappings are depressed with it; so we're
* expected to do the same here. Also, LEDs (usually) look if a real
* mod is locked, not just effective; otherwise it won't be lit.
*
* We OR here because mod_mask_get_effective() drops vmods. */
state->components.base_mods |=
mod_mask_get_effective(state->keymap, state->components.base_mods);
state->components.latched_mods |=
mod_mask_get_effective(state->keymap, state->components.latched_mods);
state->components.locked_mods |=
mod_mask_get_effective(state->keymap, state->components.locked_mods);
state->components.base_group = base_group;
state->components.latched_group = latched_group;
state->components.locked_group = locked_group;
xkb_state_update_derived(state);
return get_state_component_changes(&prev_components, &state->components);
}
/**
* Provides the symbols to use for the given key and state. Returns the
* number of symbols pointed to in syms_out.
*/
XKB_EXPORT int
xkb_state_key_get_syms(struct xkb_state *state, xkb_keycode_t kc,
const xkb_keysym_t **syms_out)
{
xkb_layout_index_t layout;
xkb_level_index_t level;
layout = xkb_state_key_get_layout(state, kc);
if (layout == XKB_LAYOUT_INVALID)
goto err;
level = xkb_state_key_get_level(state, kc, layout);
if (level == XKB_LEVEL_INVALID)
goto err;
return xkb_keymap_key_get_syms_by_level(state->keymap, kc, layout, level,
syms_out);
err:
*syms_out = NULL;
return 0;
}
/*
* http://www.x.org/releases/current/doc/kbproto/xkbproto.html#Interpreting_the_Lock_Modifier
*/
static bool
should_do_caps_transformation(struct xkb_state *state, xkb_keycode_t kc)
{
xkb_mod_index_t caps =
xkb_keymap_mod_get_index(state->keymap, XKB_MOD_NAME_CAPS);
return
xkb_state_mod_index_is_active(state, caps, XKB_STATE_MODS_EFFECTIVE) > 0 &&
xkb_state_mod_index_is_consumed(state, kc, caps) == 0;
}
/*
* http://www.x.org/releases/current/doc/kbproto/xkbproto.html#Interpreting_the_Control_Modifier
*/
static bool
should_do_ctrl_transformation(struct xkb_state *state, xkb_keycode_t kc)
{
xkb_mod_index_t ctrl =
xkb_keymap_mod_get_index(state->keymap, XKB_MOD_NAME_CTRL);
return
xkb_state_mod_index_is_active(state, ctrl, XKB_STATE_MODS_EFFECTIVE) > 0 &&
xkb_state_mod_index_is_consumed(state, kc, ctrl) == 0;
}
/* Verbatim from libX11:src/xkb/XKBBind.c */
static char
XkbToControl(char ch)
{
char c = ch;
if ((c >= '@' && c < '\177') || c == ' ')
c &= 0x1F;
else if (c == '2')
c = '\000';
else if (c >= '3' && c <= '7')
c -= ('3' - '\033');
else if (c == '8')
c = '\177';
else if (c == '/')
c = '_' & 0x1F;
return c;
}
/**
* Provides either exactly one symbol, or XKB_KEY_NoSymbol.
*/
XKB_EXPORT xkb_keysym_t
xkb_state_key_get_one_sym(struct xkb_state *state, xkb_keycode_t kc)
{
const xkb_keysym_t *syms;
xkb_keysym_t sym;
int num_syms;
num_syms = xkb_state_key_get_syms(state, kc, &syms);
if (num_syms != 1)
return XKB_KEY_NoSymbol;
sym = syms[0];
if (should_do_caps_transformation(state, kc))
sym = xkb_keysym_to_upper(sym);
return sym;
}
/*
* The caps and ctrl transformations require some special handling,
* so we cannot simply use xkb_state_get_one_sym() for them.
* In particular, if Control is set, we must try very hard to find
* some layout in which the keysym is ASCII and thus can be (maybe)
* converted to a control character. libX11 allows to disable this
* behavior with the XkbLC_ControlFallback (see XkbSetXlibControls(3)),
* but it is enabled by default, yippee.
*/
static xkb_keysym_t
get_one_sym_for_string(struct xkb_state *state, xkb_keycode_t kc)
{
xkb_level_index_t level;
xkb_layout_index_t layout, num_layouts;
const xkb_keysym_t *syms;
int nsyms;
xkb_keysym_t sym;
layout = xkb_state_key_get_layout(state, kc);
num_layouts = xkb_keymap_num_layouts_for_key(state->keymap, kc);
level = xkb_state_key_get_level(state, kc, layout);
if (layout == XKB_LAYOUT_INVALID || num_layouts == 0 ||
level == XKB_LEVEL_INVALID)
return XKB_KEY_NoSymbol;
nsyms = xkb_keymap_key_get_syms_by_level(state->keymap, kc,
layout, level, &syms);
if (nsyms != 1)
return XKB_KEY_NoSymbol;
sym = syms[0];
if (should_do_ctrl_transformation(state, kc) && sym > 127u) {
for (xkb_layout_index_t i = 0; i < num_layouts; i++) {
level = xkb_state_key_get_level(state, kc, i);
if (level == XKB_LEVEL_INVALID)
continue;
nsyms = xkb_keymap_key_get_syms_by_level(state->keymap, kc,
i, level, &syms);
if (nsyms == 1 && syms[0] <= 127u) {
sym = syms[0];
break;
}
}
}
if (should_do_caps_transformation(state, kc)) {
sym = xkb_keysym_to_upper(sym);
}
return sym;
}
XKB_EXPORT int
xkb_state_key_get_utf8(struct xkb_state *state, xkb_keycode_t kc,
char *buffer, size_t size)
{
xkb_keysym_t sym;
const xkb_keysym_t *syms;
int nsyms;
int offset;
char tmp[7];
sym = get_one_sym_for_string(state, kc);
if (sym != XKB_KEY_NoSymbol) {
nsyms = 1; syms = &sym;
}
else {
nsyms = xkb_state_key_get_syms(state, kc, &syms);
}
/* Make sure not to truncate in the middle of a UTF-8 sequence. */
offset = 0;
for (int i = 0; i < nsyms; i++) {
int ret = xkb_keysym_to_utf8(syms[i], tmp, sizeof(tmp));
if (ret <= 0)
goto err_bad;
ret--;
if ((size_t) (offset + ret) <= size)
memcpy(buffer + offset, tmp, ret);
offset += ret;
}
if ((size_t) offset >= size)
goto err_trunc;
buffer[offset] = '\0';
if (!is_valid_utf8(buffer, offset))
goto err_bad;
if (offset == 1 && (unsigned int) buffer[0] <= 127u &&
should_do_ctrl_transformation(state, kc))
buffer[0] = XkbToControl(buffer[0]);
return offset;
err_trunc:
if (size > 0)
buffer[size - 1] = '\0';
return offset;
err_bad:
if (size > 0)
buffer[0] = '\0';
return 0;
}
XKB_EXPORT uint32_t
xkb_state_key_get_utf32(struct xkb_state *state, xkb_keycode_t kc)
{
xkb_keysym_t sym;
uint32_t cp;
sym = get_one_sym_for_string(state, kc);
cp = xkb_keysym_to_utf32(sym);
if (cp <= 127u && should_do_ctrl_transformation(state, kc))
cp = (uint32_t) XkbToControl((char) cp);
return cp;
}
/**
* Serialises the requested modifier state into an xkb_mod_mask_t, with all
* the same disclaimers as in xkb_state_update_mask.
*/
XKB_EXPORT xkb_mod_mask_t
xkb_state_serialize_mods(struct xkb_state *state,
enum xkb_state_component type)
{
xkb_mod_mask_t ret = 0;
if (type & XKB_STATE_MODS_EFFECTIVE)
return state->components.mods;
if (type & XKB_STATE_MODS_DEPRESSED)
ret |= state->components.base_mods;
if (type & XKB_STATE_MODS_LATCHED)
ret |= state->components.latched_mods;
if (type & XKB_STATE_MODS_LOCKED)
ret |= state->components.locked_mods;
return ret;
}
/**
* Serialises the requested group state, with all the same disclaimers as
* in xkb_state_update_mask.
*/
XKB_EXPORT xkb_layout_index_t
xkb_state_serialize_layout(struct xkb_state *state,
enum xkb_state_component type)
{
xkb_layout_index_t ret = 0;
if (type & XKB_STATE_LAYOUT_EFFECTIVE)
return state->components.group;
if (type & XKB_STATE_LAYOUT_DEPRESSED)
ret += state->components.base_group;
if (type & XKB_STATE_LAYOUT_LATCHED)
ret += state->components.latched_group;
if (type & XKB_STATE_LAYOUT_LOCKED)
ret += state->components.locked_group;
return ret;
}
/**
* Gets a modifier mask and returns the resolved effective mask; this
* is needed because some modifiers can also map to other modifiers, e.g.
* the "NumLock" modifier usually also sets the "Mod2" modifier.
*/
xkb_mod_mask_t
mod_mask_get_effective(struct xkb_keymap *keymap, xkb_mod_mask_t mods)
{
const struct xkb_mod *mod;
xkb_mod_index_t i;
xkb_mod_mask_t mask;
/* The effective mask is only real mods for now. */
mask = mods & MOD_REAL_MASK_ALL;
xkb_mods_enumerate(i, mod, &keymap->mods)
if (mods & (1u << i))
mask |= mod->mapping;
return mask;
}
/**
* Returns 1 if the given modifier is active with the specified type(s), 0 if
* not, or -1 if the modifier is invalid.
*/
XKB_EXPORT int
xkb_state_mod_index_is_active(struct xkb_state *state,
xkb_mod_index_t idx,
enum xkb_state_component type)
{
if (idx >= xkb_keymap_num_mods(state->keymap))
return -1;
return !!(xkb_state_serialize_mods(state, type) & (1u << idx));
}
/**
* Helper function for xkb_state_mod_indices_are_active and
* xkb_state_mod_names_are_active.
*/
static int
match_mod_masks(struct xkb_state *state,
enum xkb_state_component type,
enum xkb_state_match match,
xkb_mod_mask_t wanted)
{
xkb_mod_mask_t active = xkb_state_serialize_mods(state, type);
if (!(match & XKB_STATE_MATCH_NON_EXCLUSIVE) && (active & ~wanted))
return 0;
if (match & XKB_STATE_MATCH_ANY)
return !!(active & wanted);
else
return (active & wanted) == wanted;
return 0;
}
/**
* Returns 1 if the modifiers are active with the specified type(s), 0 if
* not, or -1 if any of the modifiers are invalid.
*/
XKB_EXPORT int
xkb_state_mod_indices_are_active(struct xkb_state *state,
enum xkb_state_component type,
enum xkb_state_match match,
...)
{
va_list ap;
xkb_mod_index_t idx = 0;
xkb_mod_mask_t wanted = 0;
int ret = 0;
xkb_mod_index_t num_mods = xkb_keymap_num_mods(state->keymap);
va_start(ap, match);
while (1) {
idx = va_arg(ap, xkb_mod_index_t);
if (idx == XKB_MOD_INVALID)
break;
if (idx >= num_mods) {
ret = -1;
break;
}
wanted |= (1u << idx);
}
va_end(ap);
if (ret == -1)
return ret;
return match_mod_masks(state, type, match, wanted);
}
/**
* Returns 1 if the given modifier is active with the specified type(s), 0 if
* not, or -1 if the modifier is invalid.
*/
XKB_EXPORT int
xkb_state_mod_name_is_active(struct xkb_state *state, const char *name,
enum xkb_state_component type)
{
xkb_mod_index_t idx = xkb_keymap_mod_get_index(state->keymap, name);
if (idx == XKB_MOD_INVALID)
return -1;
return xkb_state_mod_index_is_active(state, idx, type);
}
/**
* Returns 1 if the modifiers are active with the specified type(s), 0 if
* not, or -1 if any of the modifiers are invalid.
*/
XKB_EXPORT ATTR_NULL_SENTINEL int
xkb_state_mod_names_are_active(struct xkb_state *state,
enum xkb_state_component type,
enum xkb_state_match match,
...)
{
va_list ap;
xkb_mod_index_t idx = 0;
xkb_mod_mask_t wanted = 0;
int ret = 0;
va_start(ap, match);
while (1) {
const char *str = va_arg(ap, const char *);
if (str == NULL)
break;
idx = xkb_keymap_mod_get_index(state->keymap, str);
if (idx == XKB_MOD_INVALID) {
ret = -1;
break;
}
wanted |= (1u << idx);
}
va_end(ap);
if (ret == -1)
return ret;
return match_mod_masks(state, type, match, wanted);
}
/**
* Returns 1 if the given group is active with the specified type(s), 0 if
* not, or -1 if the group is invalid.
*/
XKB_EXPORT int
xkb_state_layout_index_is_active(struct xkb_state *state,
xkb_layout_index_t idx,
enum xkb_state_component type)
{
int ret = 0;
if (idx >= state->keymap->num_groups)
return -1;
if (type & XKB_STATE_LAYOUT_EFFECTIVE)
ret |= (state->components.group == idx);
if (type & XKB_STATE_LAYOUT_DEPRESSED)
ret |= (state->components.base_group == (int32_t) idx);
if (type & XKB_STATE_LAYOUT_LATCHED)
ret |= (state->components.latched_group == (int32_t) idx);
if (type & XKB_STATE_LAYOUT_LOCKED)
ret |= (state->components.locked_group == (int32_t) idx);
return ret;
}
/**
* Returns 1 if the given modifier is active with the specified type(s), 0 if
* not, or -1 if the modifier is invalid.
*/
XKB_EXPORT int
xkb_state_layout_name_is_active(struct xkb_state *state, const char *name,
enum xkb_state_component type)
{
xkb_layout_index_t idx = xkb_keymap_layout_get_index(state->keymap, name);
if (idx == XKB_LAYOUT_INVALID)
return -1;
return xkb_state_layout_index_is_active(state, idx, type);
}
/**
* Returns 1 if the given LED is active, 0 if not, or -1 if the LED is invalid.
*/
XKB_EXPORT int
xkb_state_led_index_is_active(struct xkb_state *state, xkb_led_index_t idx)
{
if (idx >= state->keymap->num_leds ||
state->keymap->leds[idx].name == XKB_ATOM_NONE)
return -1;
return !!(state->components.leds & (1u << idx));
}
/**
* Returns 1 if the given LED is active, 0 if not, or -1 if the LED is invalid.
*/
XKB_EXPORT int
xkb_state_led_name_is_active(struct xkb_state *state, const char *name)
{
xkb_led_index_t idx = xkb_keymap_led_get_index(state->keymap, name);
if (idx == XKB_LED_INVALID)
return -1;
return xkb_state_led_index_is_active(state, idx);
}
static xkb_mod_mask_t
key_get_consumed(struct xkb_state *state, const struct xkb_key *key)
{
const struct xkb_key_type *type;
const struct xkb_key_type_entry *entry;
xkb_mod_mask_t preserve;
xkb_layout_index_t group;
group = xkb_state_key_get_layout(state, key->keycode);
if (group == XKB_LAYOUT_INVALID)
return 0;
type = key->groups[group].type;
entry = get_entry_for_key_state(state, key, group);
if (entry)
preserve = entry->preserve.mask;
else
preserve = 0;
return type->mods.mask & ~preserve;
}
/**
* Tests to see if a modifier is used up by our translation of a
* keycode to keysyms, taking note of the current modifier state and
* the appropriate key type's preserve information, if any. This allows
* the user to mask out the modifier in later processing of the
* modifiers, e.g. when implementing hot keys or accelerators.
*
* See also, for example:
* - XkbTranslateKeyCode(3), mod_rtrn return value, from libX11.
* - gdk_keymap_translate_keyboard_state, consumed_modifiers return value,
* from gtk+.
*/
XKB_EXPORT int
xkb_state_mod_index_is_consumed(struct xkb_state *state, xkb_keycode_t kc,
xkb_mod_index_t idx)
{
const struct xkb_key *key = XkbKey(state->keymap, kc);
if (!key || idx >= xkb_keymap_num_mods(state->keymap))
return -1;
return !!((1u << idx) & key_get_consumed(state, key));
}
/**
* Calculates which modifiers should be consumed during key processing,
* and returns the mask with all these modifiers removed. e.g. if
* given a state of Alt and Shift active for a two-level alphabetic
* key containing plus and equal on the first and second level
* respectively, will return a mask of only Alt, as Shift has been
* consumed by the type handling.
*/
XKB_EXPORT xkb_mod_mask_t
xkb_state_mod_mask_remove_consumed(struct xkb_state *state, xkb_keycode_t kc,
xkb_mod_mask_t mask)
{
const struct xkb_key *key = XkbKey(state->keymap, kc);
if (!key)
return 0;
return mask & ~key_get_consumed(state, key);
}
XKB_EXPORT xkb_mod_mask_t
xkb_state_key_get_consumed_mods(struct xkb_state *state, xkb_keycode_t kc)
{
const struct xkb_key *key = XkbKey(state->keymap, kc);
if (!key)
return 0;
return key_get_consumed(state, key);
}
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