1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
* 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.
*/
#ifndef COMPOSE_COMPOSE_H
#define COMPOSE_COMPOSE_H
#include "xkbcommon/xkbcommon-compose.h"
#include "utils.h"
#include "context.h"
/*
* The compose table data structure is a simple trie. An example will
* help. Given these sequences:
*
* <A> <B> : "first" dead_a
* <A> <C> <D> : "second" dead_b
* <E> <F> : "third" dead_c
*
* the trie would look like:
*
* [root] ---> [<A>] -----------------> [<E>] -#
* | | |
* # v v
* [<B>] ---> [<C>] -# [<F>] -#
* | | -
* # v #
* [<D>] -#
* |
* #
* where:
* - [root] is a special empty root node.
* - [<X>] is a node for a sequence keysym <X>.
* - right arrows are `next` pointers.
* - down arrows are `successor` pointers.
* - # is a nil pointer.
*
* The nodes are all kept in a contiguous array. Pointers are represented
* as integer offsets into this array. A nil pointer is represented as 0
* (which, helpfully, is the offset of the empty root node).
*
* Nodes without a successor are leaf nodes. Since a sequence cannot be a
* prefix of another, these are exactly the nodes which terminate the
* sequences (in a bijective manner).
*
* A leaf contains the result data of its sequence. The result keysym is
* contained in the node struct itself; the result UTF-8 string is a byte
* offset into an array of the form "\0first\0second\0third" (the initial
* \0 is so offset 0 points to an empty string).
*/
struct compose_node {
xkb_keysym_t keysym;
/* Offset into xkb_compose_table::nodes. */
unsigned int next:31;
bool is_leaf:1;
union {
/* Offset into xkb_compose_table::nodes. */
uint32_t successor;
struct {
/* Offset into xkb_compose_table::utf8. */
uint32_t utf8;
xkb_keysym_t keysym;
} leaf;
} u;
};
struct xkb_compose_table {
int refcnt;
enum xkb_compose_format format;
enum xkb_compose_compile_flags flags;
struct xkb_context *ctx;
char *locale;
darray_char utf8;
darray(struct compose_node) nodes;
};
#endif
|
