diff options
Diffstat (limited to 'src/3rdparty/xkbcommon/src/compose/compose-state.c')
| -rw-r--r-- | src/3rdparty/xkbcommon/src/compose/compose-state.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/3rdparty/xkbcommon/src/compose/compose-state.c b/src/3rdparty/xkbcommon/src/compose/compose-state.c new file mode 100644 index 0000000000..8657ff7e17 --- /dev/null +++ b/src/3rdparty/xkbcommon/src/compose/compose-state.c @@ -0,0 +1,196 @@ +/* + * 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; +} |