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/*
* Copyright © 2013 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.
*/
#include "table.h"
#include "utils.h"
#include "keysym.h"
struct xkb_compose_state {
int refcnt;
enum xkb_compose_state_flags flags;
struct xkb_compose_table *table;
/*
* Offsets into xkb_compose_table::nodes.
*
* They maintain the current and previous position in the trie; see
* xkb_compose_state_feed().
*
* This is also sufficient for inferring the current status; see
* xkb_compose_state_get_status().
*/
uint32_t prev_context;
uint32_t context;
};
XKB_EXPORT struct xkb_compose_state *
xkb_compose_state_new(struct xkb_compose_table *table,
enum xkb_compose_state_flags flags)
{
struct xkb_compose_state *state;
state = calloc(1, sizeof(*state));
if (!state)
return NULL;
state->refcnt = 1;
state->table = xkb_compose_table_ref(table);
state->flags = flags;
state->prev_context = 0;
state->context = 0;
return state;
}
XKB_EXPORT struct xkb_compose_state *
xkb_compose_state_ref(struct xkb_compose_state *state)
{
state->refcnt++;
return state;
}
XKB_EXPORT void
xkb_compose_state_unref(struct xkb_compose_state *state)
{
if (!state || --state->refcnt > 0)
return;
xkb_compose_table_unref(state->table);
free(state);
}
XKB_EXPORT struct xkb_compose_table *
xkb_compose_state_get_compose_table(struct xkb_compose_state *state)
{
return state->table;
}
XKB_EXPORT enum xkb_compose_feed_result
xkb_compose_state_feed(struct xkb_compose_state *state, xkb_keysym_t keysym)
{
uint32_t context;
const struct compose_node *node;
/*
* Modifiers do not affect the sequence directly. In particular,
* they do not cancel a sequence; otherwise it'd be impossible to
* have a sequence like <dead_acute><A> (needs Shift in the middle).
*
* The following test is not really accurate - in order to test if
* a key is "modifier key", we really need the keymap, but we don't
* have it here. However, this is (approximately) what libX11 does
* as well.
*/
if (xkb_keysym_is_modifier(keysym))
return XKB_COMPOSE_FEED_IGNORED;
node = &darray_item(state->table->nodes, state->context);
context = (node->is_leaf ? 0 : node->u.successor);
node = &darray_item(state->table->nodes, context);
while (node->keysym != keysym && node->next != 0) {
context = node->next;
node = &darray_item(state->table->nodes, context);
}
if (node->keysym != keysym)
context = 0;
state->prev_context = state->context;
state->context = context;
return XKB_COMPOSE_FEED_ACCEPTED;
}
XKB_EXPORT void
xkb_compose_state_reset(struct xkb_compose_state *state)
{
state->prev_context = 0;
state->context = 0;
}
XKB_EXPORT enum xkb_compose_status
xkb_compose_state_get_status(struct xkb_compose_state *state)
{
const struct compose_node *prev_node, *node;
prev_node = &darray_item(state->table->nodes, state->prev_context);
node = &darray_item(state->table->nodes, state->context);
if (state->context == 0 && !prev_node->is_leaf)
return XKB_COMPOSE_CANCELLED;
if (state->context == 0)
return XKB_COMPOSE_NOTHING;
if (!node->is_leaf)
return XKB_COMPOSE_COMPOSING;
return XKB_COMPOSE_COMPOSED;
}
XKB_EXPORT int
xkb_compose_state_get_utf8(struct xkb_compose_state *state,
char *buffer, size_t size)
{
const struct compose_node *node =
&darray_item(state->table->nodes, state->context);
if (!node->is_leaf)
goto fail;
/* If there's no string specified, but only a keysym, try to do the
* most helpful thing. */
if (node->u.leaf.utf8 == 0 && node->u.leaf.keysym != XKB_KEY_NoSymbol) {
char name[64];
int ret;
ret = xkb_keysym_to_utf8(node->u.leaf.keysym, name, sizeof(name));
if (ret < 0 || ret == 0) {
/* ret < 0 is impossible.
* ret == 0 means the keysym has no string representation. */
goto fail;
}
return snprintf(buffer, size, "%s", name);
}
return snprintf(buffer, size, "%s",
&darray_item(state->table->utf8, node->u.leaf.utf8));
fail:
if (size > 0)
buffer[0] = '\0';
return 0;
}
XKB_EXPORT xkb_keysym_t
xkb_compose_state_get_one_sym(struct xkb_compose_state *state)
{
const struct compose_node *node =
&darray_item(state->table->nodes, state->context);
if (!node->is_leaf)
return XKB_KEY_NoSymbol;
return node->u.leaf.keysym;
}
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