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bee58fd09d
gtk2/gtk/gtkcomposetable.c
Matthias Clasen bee58fd09d composetable: Introduce a parser struct 
This will be used in the following commits to
beef up Compose file parsing.
2021-07-13 22:02:33 -04:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2015 Takao Fujiwara <takao.fujiwara1@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <gdk/gdk.h>
#include <glib.h>
#include <glib/gprintf.h>
#include <glib/gstdio.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include "gtkcomposetable.h"
#include "gtkimcontextsimple.h"
#define GTK_COMPOSE_TABLE_MAGIC "GtkComposeTable"
#define GTK_COMPOSE_TABLE_VERSION (2)
/* Maximum length of sequences we parse */
#define MAX_COMPOSE_LEN 20
typedef struct {
gunichar *sequence;
char *value;
} GtkComposeData;
static void
gtk_compose_data_free (GtkComposeData *compose_data)
{
g_free (compose_data->sequence);
g_free (compose_data->value);
g_slice_free (GtkComposeData, compose_data);
}
typedef struct {
GList *sequences;
} GtkComposeParser;
static GtkComposeParser *
parser_new (void)
{
GtkComposeParser *parser;
parser = g_new (GtkComposeParser, 1);
parser->sequences = NULL;
return parser;
}
static void
parser_free (GtkComposeParser *parser)
{
g_list_free_full (parser->sequences, (GDestroyNotify) gtk_compose_data_free);
g_free (parser);
}
static gboolean
is_codepoint (const char *str)
{
int i;
/* 'U' is not code point but 'U00C0' is code point */
if (str[0] == '\0' || str[0] != 'U' || str[1] == '\0')
return FALSE;
for (i = 1; str[i] != '\0'; i++)
{
if (!g_ascii_isxdigit (str[i]))
return FALSE;
}
return TRUE;
}
static gboolean
parse_compose_value (GtkComposeData *compose_data,
const char *val,
const char *line)
{
const char *p;
GString *value;
gunichar ch;
char *endp;
value = g_string_new ("");
if (val[0] != '"')
{
g_warning ("Only strings supported after ':': %s: %s", val, line);
goto fail;
}
p = val + 1;
while (*p)
{
if (*p == '\"')
{
compose_data->value = g_string_free (value, FALSE);
return TRUE;
}
if (p[1] == '\0')
{
g_warning ("Missing closing '\"': %s: %s", val, line);
goto fail;
}
else if (*p == '\\')
{
if (p[1] == '"')
{
g_string_append_c (value, '"');
p += 2;
}
else if (p[1] == '\\')
{
g_string_append_c (value, '\\');
p += 2;
}
else if (p[1] >= '0' && p[1] < '8')
{
ch = g_ascii_strtoll (p + 1, &endp, 8);
if (ch == 0)
{
g_warning ("Invalid escape sequence: %s: %s", val, line);
goto fail;
}
g_string_append_unichar (value, ch);
p = endp;
}
else if (p[1] == 'x' || p[1] == 'X')
{
ch = g_ascii_strtoll (p + 2, &endp, 16);
if (ch == 0)
{
g_warning ("Invalid escape sequence: %s: %s", val, line);
goto fail;
}
g_string_append_unichar (value, ch);
p = endp;
}
else
{
g_warning ("Invalid escape sequence: %s: %s", val, line);
goto fail;
}
}
else
{
ch = g_utf8_get_char (p);
g_string_append_unichar (value, ch);
p = g_utf8_next_char (p);
}
}
fail:
g_string_free (value, TRUE);
return FALSE;
}
static gboolean
parse_compose_sequence (GtkComposeData *compose_data,
const char *seq,
const char *line)
{
char **words = g_strsplit (seq, "<", -1);
int i;
int n = 0;
if (g_strv_length (words) < 2)
{
g_warning ("key sequence format is <a> <b>...: %s", line);
goto fail;
}
for (i = 1; words[i] != NULL; i++)
{
char *start = words[i];
char *end = strchr (words[i], '>');
char *match;
gunichar codepoint;
if (words[i][0] == '\0')
continue;
if (start == NULL || end == NULL || end <= start)
{
g_warning ("key sequence format is <a> <b>...: %s", line);
goto fail;
}
match = g_strndup (start, end - start);
if (compose_data->sequence == NULL)
compose_data->sequence = g_malloc (sizeof (gunichar) * 2);
else
compose_data->sequence = g_realloc (compose_data->sequence, sizeof (gunichar) * (n + 2));
if (is_codepoint (match))
{
codepoint = (gunichar) g_ascii_strtoll (match + 1, NULL, 16);
compose_data->sequence[n] = codepoint;
compose_data->sequence[n + 1] = 0;
}
else
{
codepoint = (gunichar) gdk_keyval_from_name (match);
compose_data->sequence[n] = codepoint;
compose_data->sequence[n + 1] = 0;
}
if (codepoint == GDK_KEY_VoidSymbol)
g_warning ("Could not get code point of keysym %s", match);
g_free (match);
n++;
}
g_strfreev (words);
if (0 == n || n > MAX_COMPOSE_LEN)
{
g_warning ("Suspicious compose sequence length (%d). Are you sure this is right?: %s",
n, line);
return FALSE;
}
return TRUE;
fail:
g_strfreev (words);
return FALSE;
}
static void
parse_compose_line (GList **compose_list,
const char *line)
{
char **components = NULL;
GtkComposeData *compose_data = NULL;
if (line[0] == '\0' || line[0] == '#')
return;
if (g_str_has_prefix (line, "include "))
return;
components = g_strsplit (line, ":", 2);
if (components[1] == NULL)
{
g_warning ("No delimiter ':': %s", line);
goto fail;
}
compose_data = g_slice_new0 (GtkComposeData);
if (!parse_compose_sequence (compose_data, g_strstrip (components[0]), line))
goto fail;
if (!parse_compose_value (compose_data, g_strstrip (components[1]), line))
goto fail;
g_strfreev (components);
*compose_list = g_list_append (*compose_list, compose_data);
return;
fail:
g_strfreev (components);
if (compose_data)
gtk_compose_data_free (compose_data);
}
extern const GtkComposeTableCompact gtk_compose_table_compact;
static GList *
gtk_compose_list_parse_file (const char *compose_file)
{
char *contents = NULL;
char **lines = NULL;
gsize length = 0;
GError *error = NULL;
GList *compose_list = NULL;
int i;
if (!g_file_get_contents (compose_file, &contents, &length, &error))
{
g_warning ("%s", error->message);
g_error_free (error);
return NULL;
}
lines = g_strsplit (contents, "\n", -1);
g_free (contents);
for (i = 0; lines[i] != NULL; i++)
parse_compose_line (&compose_list, lines[i]);
g_strfreev (lines);
return compose_list;
}
static GList *
gtk_compose_list_check_duplicated (GList *compose_list)
{
GList *list;
GList *removed_list = NULL;
GtkComposeData *compose_data;
for (list = compose_list; list != NULL; list = list->next)
{
static guint16 keysyms[MAX_COMPOSE_LEN + 1];
int i;
int n_compose = 0;
gboolean compose_finish;
gunichar output_char;
char buf[8] = { 0, };
compose_data = list->data;
for (i = 0; i < MAX_COMPOSE_LEN + 1; i++)
keysyms[i] = 0;
for (i = 0; i < MAX_COMPOSE_LEN + 1; i++)
{
gunichar codepoint = compose_data->sequence[i];
keysyms[i] = (guint16) codepoint;
if (codepoint == 0)
break;
n_compose++;
}
if (gtk_compose_table_compact_check (&gtk_compose_table_compact,
keysyms, n_compose,
&compose_finish,
NULL,
&output_char) &&
compose_finish)
{
g_unichar_to_utf8 (output_char, buf);
if (strcmp (compose_data->value, buf) == 0)
removed_list = g_list_prepend (removed_list, compose_data);
}
else if (gtk_check_algorithmically (keysyms, n_compose, &output_char))
{
g_unichar_to_utf8 (output_char, buf);
if (strcmp (compose_data->value, buf) == 0)
removed_list = g_list_prepend (removed_list, compose_data);
}
}
for (list = removed_list; list != NULL; list = list->next)
{
compose_data = list->data;
compose_list = g_list_remove (compose_list, compose_data);
gtk_compose_data_free (compose_data);
}
g_list_free (removed_list);
return compose_list;
}
static GList *
gtk_compose_list_check_uint16 (GList *compose_list)
{
GList *list;
GList *removed_list = NULL;
GtkComposeData *compose_data;
for (list = compose_list; list != NULL; list = list->next)
{
int i;
compose_data = list->data;
for (i = 0; i < MAX_COMPOSE_LEN; i++)
{
gunichar codepoint = compose_data->sequence[i];
if (codepoint == 0)
break;
if (codepoint > 0xffff)
{
removed_list = g_list_prepend (removed_list, compose_data);
break;
}
}
}
for (list = removed_list; list != NULL; list = list->next)
{
compose_data = list->data;
compose_list = g_list_remove (compose_list, compose_data);
gtk_compose_data_free (compose_data);
}
g_list_free (removed_list);
return compose_list;
}
static GList *
gtk_compose_list_format_for_gtk (GList *compose_list,
int *p_max_compose_len,
int *p_n_index_stride)
{
GList *list;
GtkComposeData *compose_data;
int max_compose_len = 0;
int i;
gunichar codepoint;
for (list = compose_list; list != NULL; list = list->next)
{
compose_data = list->data;
for (i = 0; i < MAX_COMPOSE_LEN + 1; i++)
{
codepoint = compose_data->sequence[i];
if (codepoint == 0)
{
if (max_compose_len < i)
max_compose_len = i;
break;
}
}
}
if (p_max_compose_len)
*p_max_compose_len = max_compose_len;
if (p_n_index_stride)
*p_n_index_stride = max_compose_len + 2;
return compose_list;
}
static int
gtk_compose_data_compare (gpointer a,
gpointer b,
gpointer data)
{
GtkComposeData *compose_data_a = a;
GtkComposeData *compose_data_b = b;
int max_compose_len = GPOINTER_TO_INT (data);
int i;
for (i = 0; i < max_compose_len; i++)
{
gunichar code_a = compose_data_a->sequence[i];
gunichar code_b = compose_data_b->sequence[i];
if (code_a != code_b)
return code_a - code_b;
}
return 0;
}
/* Implemented from g_str_hash() */
static guint32
data_hash (gconstpointer v, int length)
{
const guint16 *p, *head;
unsigned char c;
guint32 h = 5381;
for (p = v, head = v; (p - head) < length; p++)
{
c = 0x00ff & (*p >> 8);
h = (h << 5) + h + c;
c = 0x00ff & *p;
h = (h << 5) + h + c;
}
return h;
}
guint32
gtk_compose_table_data_hash (const guint16 *data,
int max_seq_len,
int n_seqs)
{
gsize n_index_stride;
gsize length;
n_index_stride = max_seq_len + 2;
if (!g_size_checked_mul (&length, n_index_stride, n_seqs))
{
g_critical ("Overflow in the compose sequences");
return 0;
}
return data_hash (data, length);
}
static char *
gtk_compose_hash_get_cache_path (guint32 hash)
{
char *basename = NULL;
char *dir = NULL;
char *path = NULL;
basename = g_strdup_printf ("%08x.cache", hash);
dir = g_build_filename (g_get_user_cache_dir (), "gtk-4.0", "compose", NULL);
path = g_build_filename (dir, basename, NULL);
if (g_mkdir_with_parents (dir, 0755) != 0)
{
g_warning ("Failed to mkdir %s", dir);
g_free (path);
path = NULL;
}
g_free (dir);
g_free (basename);
return path;
}
static char *
gtk_compose_table_serialize (GtkComposeTable *compose_table,
gsize *count)
{
char *p, *contents;
gsize length, total_length;
guint16 bytes;
const char *header = GTK_COMPOSE_TABLE_MAGIC;
const guint16 version = GTK_COMPOSE_TABLE_VERSION;
guint16 max_seq_len = compose_table->max_seq_len;
guint16 index_stride = max_seq_len + 2;
guint16 n_seqs = compose_table->n_seqs;
guint16 n_chars = compose_table->n_chars;
guint32 i;
g_return_val_if_fail (compose_table != NULL, NULL);
g_return_val_if_fail (max_seq_len > 0, NULL);
g_return_val_if_fail (index_stride > 0, NULL);
length = strlen (header);
total_length = length + sizeof (guint16) * (4 + index_stride * n_seqs) + n_chars;
if (count)
*count = total_length;
p = contents = g_malloc (total_length);
memcpy (p, header, length);
p += length;
#define APPEND_GUINT16(elt) \
bytes = GUINT16_TO_BE (elt); \
memcpy (p, &bytes, sizeof (guint16)); \
p += sizeof (guint16);
APPEND_GUINT16 (version);
APPEND_GUINT16 (max_seq_len);
APPEND_GUINT16 (n_seqs);
APPEND_GUINT16 (n_chars);
for (i = 0; i < (guint32) index_stride * n_seqs; i++)
{
APPEND_GUINT16 (compose_table->data[i]);
}
if (compose_table->n_chars > 0)
memcpy (p, compose_table->char_data, compose_table->n_chars);
#undef APPEND_GUINT16
return contents;
}
static GtkComposeTable *
gtk_compose_table_load_cache (const char *compose_file)
{
guint32 hash;
char *path = NULL;
char *contents = NULL;
char *p;
GStatBuf original_buf;
GStatBuf cache_buf;
gsize total_length;
GError *error = NULL;
guint16 bytes;
guint16 version;
guint16 max_seq_len;
guint16 index_stride;
guint16 n_seqs;
guint16 n_chars;
guint32 i;
guint16 *gtk_compose_seqs = NULL;
GtkComposeTable *retval;
char *char_data = NULL;
hash = g_str_hash (compose_file);
if ((path = gtk_compose_hash_get_cache_path (hash)) == NULL)
return NULL;
if (!g_file_test (path, G_FILE_TEST_EXISTS))
goto out_load_cache;
g_stat (compose_file, &original_buf);
g_stat (path, &cache_buf);
if (original_buf.st_mtime > cache_buf.st_mtime)
goto out_load_cache;
if (!g_file_get_contents (path, &contents, &total_length, &error))
{
g_warning ("Failed to get cache content %s: %s", path, error->message);
g_error_free (error);
goto out_load_cache;
}
#define GET_GUINT16(elt) \
memcpy (&bytes, p, sizeof (guint16)); \
elt = GUINT16_FROM_BE (bytes); \
p += sizeof (guint16);
p = contents;
if (g_ascii_strncasecmp (p, GTK_COMPOSE_TABLE_MAGIC,
strlen (GTK_COMPOSE_TABLE_MAGIC)) != 0)
{
g_warning ("The file is not a GtkComposeTable cache file %s", path);
goto out_load_cache;
}
p += strlen (GTK_COMPOSE_TABLE_MAGIC);
if (p - contents > total_length)
{
g_warning ("Broken cache content %s at head", path);
goto out_load_cache;
}
GET_GUINT16 (version);
if (version != GTK_COMPOSE_TABLE_VERSION)
{
g_warning ("cache version is different %u != %u",
version, GTK_COMPOSE_TABLE_VERSION);
goto out_load_cache;
}
GET_GUINT16 (max_seq_len);
GET_GUINT16 (n_seqs);
GET_GUINT16 (n_chars);
if (max_seq_len == 0 || n_seqs == 0)
{
g_warning ("cache size is not correct %d %d", max_seq_len, n_seqs);
goto out_load_cache;
}
index_stride = max_seq_len + 2;
gtk_compose_seqs = g_new0 (guint16, n_seqs * index_stride);
for (i = 0; i < (guint32) index_stride * n_seqs; i++)
{
GET_GUINT16 (gtk_compose_seqs[i]);
}
if (n_chars > 0)
{
char_data = g_new (char, n_chars + 1);
memcpy (char_data, p, n_chars);
char_data[n_chars] = '\0';
}
retval = g_new0 (GtkComposeTable, 1);
retval->data = gtk_compose_seqs;
retval->max_seq_len = max_seq_len;
retval->n_seqs = n_seqs;
retval->char_data = char_data;
retval->n_chars = n_chars;
retval->id = hash;
g_free (contents);
g_free (path);
return retval;
#undef GET_GUINT16
out_load_cache:
g_free (gtk_compose_seqs);
g_free (char_data);
g_free (contents);
g_free (path);
return NULL;
}
static void
gtk_compose_table_save_cache (GtkComposeTable *compose_table)
{
char *path = NULL;
char *contents = NULL;
GError *error = NULL;
gsize length = 0;
if ((path = gtk_compose_hash_get_cache_path (compose_table->id)) == NULL)
return;
contents = gtk_compose_table_serialize (compose_table, &length);
if (contents == NULL)
{
g_warning ("Failed to serialize compose table %s", path);
goto out_save_cache;
}
if (!g_file_set_contents (path, contents, length, &error))
{
g_warning ("Failed to save compose table %s: %s", path, error->message);
g_error_free (error);
goto out_save_cache;
}
out_save_cache:
g_free (contents);
g_free (path);
}
static GtkComposeTable *
gtk_compose_table_new_with_list (GList *compose_list,
int max_compose_len,
int n_index_stride,
guint32 hash)
{
guint length;
guint n = 0;
int i, j;
guint16 *gtk_compose_seqs = NULL;
GList *list;
GtkComposeData *compose_data;
GtkComposeTable *retval = NULL;
gunichar codepoint;
GString *char_data;
g_return_val_if_fail (compose_list != NULL, NULL);
length = g_list_length (compose_list);
gtk_compose_seqs = g_new0 (guint16, length * n_index_stride);
char_data = g_string_new ("");
for (list = compose_list; list != NULL; list = list->next)
{
compose_data = list->data;
for (i = 0; i < max_compose_len; i++)
{
if (compose_data->sequence[i] == 0)
{
for (j = i; j < max_compose_len; j++)
gtk_compose_seqs[n++] = 0;
break;
}
gtk_compose_seqs[n++] = (guint16) compose_data->sequence[i];
}
if (g_utf8_strlen (compose_data->value, -1) > 1)
{
if (char_data->len > 0)
g_string_append_c (char_data, 0);
codepoint = char_data->len | (1 << 31);
g_string_append (char_data, compose_data->value);
}
else
{
codepoint = g_utf8_get_char (compose_data->value);
g_assert ((codepoint & (1 << 31)) == 0);
}
gtk_compose_seqs[n++] = (codepoint & 0xffff0000) >> 16;
gtk_compose_seqs[n++] = codepoint & 0xffff;
}
retval = g_new0 (GtkComposeTable, 1);
retval->data = gtk_compose_seqs;
retval->max_seq_len = max_compose_len;
retval->n_seqs = length;
retval->id = hash;
retval->n_chars = char_data->len;
retval->char_data = g_string_free (char_data, FALSE);
return retval;
}
GtkComposeTable *
gtk_compose_table_new_with_file (const char *compose_file)
{
GtkComposeParser *parser;
GtkComposeTable *compose_table;
int max_compose_len = 0;
int n_index_stride = 0;
g_assert (compose_file != NULL);
compose_table = NULL;
compose_table = gtk_compose_table_load_cache (compose_file);
if (compose_table != NULL)
return compose_table;
parser = parser_new ();
parser->sequences = gtk_compose_list_parse_file (compose_file);
if (parser->sequences == NULL)
goto out;
parser->sequences = gtk_compose_list_check_duplicated (parser->sequences);
parser->sequences = gtk_compose_list_check_uint16 (parser->sequences);
parser->sequences = gtk_compose_list_format_for_gtk (parser->sequences,
&max_compose_len,
&n_index_stride);
parser->sequences = g_list_sort_with_data (parser->sequences,
(GCompareDataFunc) gtk_compose_data_compare,
GINT_TO_POINTER (max_compose_len));
if (parser->sequences == NULL)
{
g_warning ("compose file %s does not include any keys besides keys in en-us compose file", compose_file);
goto out;
}
compose_table = gtk_compose_table_new_with_list (parser->sequences,
max_compose_len,
n_index_stride,
g_str_hash (compose_file));
gtk_compose_table_save_cache (compose_table);
out:
parser_free (parser);
return compose_table;
}
GtkComposeTable *
gtk_compose_table_new_with_data (const guint16 *data,
int max_seq_len,
int n_seqs)
{
GtkComposeTable *compose_table;
gsize n_index_stride;
gsize length;
int i;
guint16 *gtk_compose_seqs = NULL;
g_return_val_if_fail (data != NULL, NULL);
g_return_val_if_fail (max_seq_len >= 0, NULL);
g_return_val_if_fail (n_seqs >= 0, NULL);
n_index_stride = max_seq_len + 2;
if (!g_size_checked_mul (&length, n_index_stride, n_seqs))
{
g_critical ("Overflow in the compose sequences");
return NULL;
}
gtk_compose_seqs = g_new0 (guint16, length);
for (i = 0; i < length; i++)
gtk_compose_seqs[i] = data[i];
compose_table = g_new (GtkComposeTable, 1);
compose_table->data = gtk_compose_seqs;
compose_table->max_seq_len = max_seq_len;
compose_table->n_seqs = n_seqs;
compose_table->id = data_hash (data, length);
compose_table->char_data = NULL;
compose_table->n_chars = 0;
return compose_table;
}
static int
compare_seq (const void *key, const void *value)
{
int i = 0;
const guint16 *keysyms = key;
const guint16 *seq = value;
while (keysyms[i])
{
if (keysyms[i] < seq[i])
return -1;
else if (keysyms[i] > seq[i])
return 1;
i++;
}
return 0;
}
/*
* gtk_compose_table_check:
* @table: the table to check
* @compose_buffer: the key vals to match
* @n_compose: number of non-zero key vals in @compose_buffer
* @compose_finish: (out): return location for whether there may be longer matches
* @compose_match: (out): return location for whether there is a match
* @output: (out) (caller-allocates): return location for the match values
*
* Looks for matches for a key sequence in @table.
*
* Returns: %TRUE if there were any matches, %FALSE otherwise
*/
gboolean
gtk_compose_table_check (const GtkComposeTable *table,
const guint16 *compose_buffer,
int n_compose,
gboolean *compose_finish,
gboolean *compose_match,
GString *output)
{
int row_stride = table->max_seq_len + 2;
guint16 *seq;
*compose_finish = FALSE;
*compose_match = FALSE;
g_string_set_size (output, 0);
/* Will never match, if the sequence in the compose buffer is longer
* than the sequences in the table. Further, compare_seq (key, val)
* will overrun val if key is longer than val.
*/
if (n_compose > table->max_seq_len)
return FALSE;
seq = bsearch (compose_buffer,
table->data, table->n_seqs,
sizeof (guint16) * row_stride,
compare_seq);
if (seq)
{
guint16 *prev_seq;
/* Back up to the first sequence that matches to make sure
* we find the exact match if there is one.
*/
while (seq > table->data)
{
prev_seq = seq - row_stride;
if (compare_seq (compose_buffer, prev_seq) != 0)
break;
seq = prev_seq;
}
if (n_compose == table->max_seq_len ||
seq[n_compose] == 0) /* complete sequence */
{
guint16 *next_seq;
gunichar value;
value = (seq[table->max_seq_len] << 16) | seq[table->max_seq_len + 1];
if ((value & (1 << 31)) != 0)
g_string_append (output, &table->char_data[value & ~(1 << 31)]);
else
g_string_append_unichar (output, value);
*compose_match = TRUE;
/* We found a tentative match. See if there are any longer
* sequences containing this subsequence
*/
next_seq = seq + row_stride;
if (next_seq < table->data + row_stride * table->n_seqs)
{
if (compare_seq (compose_buffer, next_seq) == 0)
return TRUE;
}
*compose_finish = TRUE;
return TRUE;
}
return TRUE;
}
return FALSE;
}
static int
compare_seq_index (const void *key, const void *value)
{
const guint16 *keysyms = key;
const guint16 *seq = value;
if (keysyms[0] < seq[0])
return -1;
else if (keysyms[0] > seq[0])
return 1;
return 0;
}
gboolean
gtk_compose_table_compact_check (const GtkComposeTableCompact *table,
const guint16 *compose_buffer,
int n_compose,
gboolean *compose_finish,
gboolean *compose_match,
gunichar *output_char)
{
int row_stride;
guint16 *seq_index;
guint16 *seq;
int i;
gboolean match;
gunichar value;
if (compose_finish)
*compose_finish = FALSE;
if (compose_match)
*compose_match = FALSE;
if (output_char)
*output_char = 0;
/* Will never match, if the sequence in the compose buffer is longer
* than the sequences in the table. Further, compare_seq (key, val)
* will overrun val if key is longer than val.
*/
if (n_compose > table->max_seq_len)
return FALSE;
seq_index = bsearch (compose_buffer,
table->data,
table->n_index_size,
sizeof (guint16) * table->n_index_stride,
compare_seq_index);
if (!seq_index)
return FALSE;
if (n_compose == 1)
return TRUE;
seq = NULL;
match = FALSE;
value = 0;
for (i = n_compose - 1; i < table->max_seq_len; i++)
{
row_stride = i + 1;
if (seq_index[i + 1] - seq_index[i] > 0)
{
seq = bsearch (compose_buffer + 1,
table->data + seq_index[i],
(seq_index[i + 1] - seq_index[i]) / row_stride,
sizeof (guint16) * row_stride,
compare_seq);
if (seq)
{
if (i == n_compose - 1)
{
value = seq[row_stride - 1];
match = TRUE;
}
else
{
if (output_char)
*output_char = value;
if (match)
{
if (compose_match)
*compose_match = TRUE;
}
return TRUE;
}
}
}
}
if (match)
{
if (compose_match)
*compose_match = TRUE;
if (compose_finish)
*compose_finish = TRUE;
if (output_char)
*output_char = value;
return TRUE;
}
return FALSE;
}
/* Checks if a keysym is a dead key.
* Dead key keysym values are defined in ../gdk/gdkkeysyms.h and the
* first is GDK_KEY_dead_grave. As X.Org is updated, more dead keys
* are added and we need to update the upper limit.
*/
#define IS_DEAD_KEY(k) \
((k) >= GDK_KEY_dead_grave && (k) <= GDK_KEY_dead_greek)
/* This function receives a sequence of Unicode characters and tries to
* normalize it (NFC). We check for the case where the resulting string
* has length 1 (single character).
* NFC normalisation normally rearranges diacritic marks, unless these
* belong to the same Canonical Combining Class.
* If they belong to the same canonical combining class, we produce all
* permutations of the diacritic marks, then attempt to normalize.
*/
static gboolean
check_normalize_nfc (gunichar *combination_buffer,
int n_compose)
{
gunichar *combination_buffer_temp;
char *combination_utf8_temp = NULL;
char *nfc_temp = NULL;
int n_combinations;
gunichar temp_swap;
int i;
combination_buffer_temp = g_alloca (n_compose * sizeof (gunichar));
n_combinations = 1;
for (i = 1; i < n_compose; i++)
n_combinations *= i;
/* Xorg reuses dead_tilde for the perispomeni diacritic mark.
* We check if base character belongs to Greek Unicode block,
* and if so, we replace tilde with perispomeni.
*/
if (combination_buffer[0] >= 0x390 && combination_buffer[0] <= 0x3FF)
{
for (i = 1; i < n_compose; i++ )
if (combination_buffer[i] == 0x303)
combination_buffer[i] = 0x342;
}
memcpy (combination_buffer_temp, combination_buffer, n_compose * sizeof (gunichar) );
for (i = 0; i < n_combinations; i++)
{
g_unicode_canonical_ordering (combination_buffer_temp, n_compose);
combination_utf8_temp = g_ucs4_to_utf8 (combination_buffer_temp, n_compose, NULL, NULL, NULL);
nfc_temp = g_utf8_normalize (combination_utf8_temp, -1, G_NORMALIZE_NFC);
if (g_utf8_strlen (nfc_temp, -1) == 1)
{
memcpy (combination_buffer, combination_buffer_temp, n_compose * sizeof (gunichar) );
g_free (combination_utf8_temp);
g_free (nfc_temp);
return TRUE;
}
g_free (combination_utf8_temp);
g_free (nfc_temp);
if (n_compose > 2)
{
temp_swap = combination_buffer_temp[i % (n_compose - 1) + 1];
combination_buffer_temp[i % (n_compose - 1) + 1] = combination_buffer_temp[(i+1) % (n_compose - 1) + 1];
combination_buffer_temp[(i+1) % (n_compose - 1) + 1] = temp_swap;
}
else
break;
}
return FALSE;
}
gboolean
gtk_check_algorithmically (const guint16 *compose_buffer,
int n_compose,
gunichar *output_char)
{
int i;
gunichar *combination_buffer;
char *combination_utf8, *nfc;
combination_buffer = alloca (sizeof (gunichar) * (n_compose + 1));
if (output_char)
*output_char = 0;
for (i = 0; i < n_compose && IS_DEAD_KEY (compose_buffer[i]); i++)
;
/* Allow at most 2 dead keys */
if (i > 2)
return FALSE;
/* Can't combine if there's no base character */
if (i == n_compose)
return TRUE;
if (i > 0 && i == n_compose - 1)
{
combination_buffer[0] = gdk_keyval_to_unicode (compose_buffer[i]);
combination_buffer[n_compose] = 0;
i--;
while (i >= 0)
{
switch (compose_buffer[i])
{
#define CASE(keysym, unicode) \
case GDK_KEY_dead_##keysym: combination_buffer[i+1] = unicode; break
CASE (grave, 0x0300);
CASE (acute, 0x0301);
CASE (circumflex, 0x0302);
CASE (tilde, 0x0303); /* Also used with perispomeni, 0x342. */
CASE (macron, 0x0304);
CASE (breve, 0x0306);
CASE (abovedot, 0x0307);
CASE (diaeresis, 0x0308);
CASE (abovering, 0x30A);
CASE (hook, 0x0309);
CASE (doubleacute, 0x030B);
CASE (caron, 0x030C);
CASE (cedilla, 0x0327);
CASE (ogonek, 0x0328); /* Legacy use for dasia, 0x314.*/
CASE (iota, 0x0345);
CASE (voiced_sound, 0x3099); /* Per Markus Kuhn keysyms.txt file. */
CASE (semivoiced_sound, 0x309A); /* Per Markus Kuhn keysyms.txt file. */
CASE (belowdot, 0x0323);
CASE (horn, 0x031B); /* Legacy use for psili, 0x313 (or 0x343). */
CASE (stroke, 0x335);
CASE (abovecomma, 0x0313); /* Equivalent to psili */
CASE (abovereversedcomma, 0x0314); /* Equivalent to dasia */
CASE (doublegrave, 0x30F);
CASE (belowring, 0x325);
CASE (belowmacron, 0x331);
CASE (belowcircumflex, 0x32D);
CASE (belowtilde, 0x330);
CASE (belowbreve, 0x32e);
CASE (belowdiaeresis, 0x324);
CASE (invertedbreve, 0x32f);
CASE (belowcomma, 0x326);
CASE (lowline, 0x332);
CASE (aboveverticalline, 0x30D);
CASE (belowverticalline, 0x329);
CASE (longsolidusoverlay, 0x338);
CASE (a, 0x363);
CASE (A, 0x363);
CASE (e, 0x364);
CASE (E, 0x364);
CASE (i, 0x365);
CASE (I, 0x365);
CASE (o, 0x366);
CASE (O, 0x366);
CASE (u, 0x367);
CASE (U, 0x367);
CASE (small_schwa, 0x1DEA);
CASE (capital_schwa, 0x1DEA);
#undef CASE
default:
combination_buffer[i+1] = gdk_keyval_to_unicode (compose_buffer[i]);
}
i--;
}
/* If the buffer normalizes to a single character, then modify the order
* of combination_buffer accordingly, if necessary, and return TRUE.
*/
if (check_normalize_nfc (combination_buffer, n_compose))
{
combination_utf8 = g_ucs4_to_utf8 (combination_buffer, -1, NULL, NULL, NULL);
nfc = g_utf8_normalize (combination_utf8, -1, G_NORMALIZE_NFC);
if (output_char)
*output_char = g_utf8_get_char (nfc);
g_free (combination_utf8);
g_free (nfc);
return TRUE;
}
}
return FALSE;
}
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