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gtk2/gtk/gtkcomposetable.c
Matthias Clasen 87e2a02e0c composetable: Rewrite Compose files if necessary 
Apply heuristics to avoid breaking users existing configurations
with the change to not always add the default sequences.

If we find a cache that was generated before 4.4, and the Compose
file does not have an include, and doesn't contain so many sequences
that it is probably a copy of the system one, we take steps to keep
things working, and thell the user about it.
2021-07-15 09:30:09 -04:00

1605 lines
40 KiB
C
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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 (3)
extern const GtkComposeTable builtin_compose_table;
/* Maximum length of sequences we parse */
#define MAX_COMPOSE_LEN 20
/* 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;
}
static guint32
sequence_hash (gconstpointer v)
{
const gunichar *p = v;
int i;
for (i = 0; p[i]; i++) ;
return data_hash (v, i);
}
static gboolean
sequence_equal (gconstpointer v1,
gconstpointer v2)
{
const gunichar *p1 = v1;
const gunichar *p2 = v2;
int i;
for (i = 0; p1[i] && p2[i] && p1[i] == p2[i]; i++) ;
return p1[i] == p2[i];
}
typedef struct {
GHashTable *sequences;
GList *files;
const char *compose_file;
gboolean found_include;
} GtkComposeParser;
static GtkComposeParser *
parser_new (void)
{
GtkComposeParser *parser;
parser = g_new (GtkComposeParser, 1);
parser->sequences = g_hash_table_new_full (sequence_hash, sequence_equal, g_free, g_free);
parser->files = NULL;
parser->compose_file = NULL;
parser->found_include = FALSE;
return parser;
}
static void
parser_free (GtkComposeParser *parser)
{
g_hash_table_unref (parser->sequences);
g_list_free_full (parser->files, g_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 char *
parse_compose_value (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 == '\"')
{
return g_string_free (value, FALSE);
}
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 NULL;
}
static gunichar *
parse_compose_sequence (const char *seq,
const char *line)
{
char **words = g_strsplit (seq, "<", -1);
int i;
int n = 0;
gunichar *sequence = NULL;
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);
sequence = g_realloc (sequence, sizeof (gunichar) * (n + 2));
if (is_codepoint (match))
{
codepoint = (gunichar) g_ascii_strtoll (match + 1, NULL, 16);
sequence[n] = codepoint;
sequence[n + 1] = 0;
}
else
{
codepoint = (gunichar) gdk_keyval_from_name (match);
sequence[n] = codepoint;
sequence[n + 1] = 0;
}
if (codepoint == GDK_KEY_VoidSymbol)
g_warning ("Could not get code point of keysym %s", match);
g_free (match);
n++;
}
if (0 == n || n > MAX_COMPOSE_LEN)
{
g_warning ("Suspicious compose sequence length (%d). Are you sure this is right?: %s",
n, line);
goto fail;
}
g_strfreev (words);
return sequence;
fail:
g_strfreev (words);
g_free (sequence);
return NULL;
}
static void parser_parse_file (GtkComposeParser *parser,
const char *path);
/* Substitute %H, %L and %S */
static char *
handle_substitutions (const char *start,
int length)
{
GString *s;
const char *locale_name;
const char *p;
s = g_string_new ("");
locale_name = getenv ("LANG");
for (p = start; *p && p < start + length; p++)
{
if (*p != '%')
{
g_string_append_c (s, *p);
}
else
{
switch (p[1])
{
case 'H':
p++;
g_string_append (s, g_get_home_dir ());
break;
case 'L':
p++;
g_string_append_printf (s, "/usr/share/X11/locale/%s/Compose", locale_name);
break;
case 'S':
p++;
g_string_append (s, "/usr/share/X11/locale");
break;
default: ;
/* do nothing, next iteration handles p[1] */
}
}
}
return g_string_free (s, FALSE);
}
static void
add_sequence (gunichar *sequence,
int len,
const char *value,
gpointer data)
{
GtkComposeParser *parser = data;
gunichar *seq;
seq = g_new (gunichar, len + 1);
memcpy (seq, sequence, (len + 1) * sizeof (gunichar));
g_hash_table_replace (parser->sequences, seq, g_strdup (value));
}
static void
parser_add_default_sequences (GtkComposeParser *parser)
{
const GtkComposeTable *table = &builtin_compose_table;
gtk_compose_table_foreach (table, add_sequence, parser);
}
static void
parser_handle_include (GtkComposeParser *parser,
const char *line)
{
const char *p;
const char *start, *end;
char *path;
parser->found_include = TRUE;
p = line + strlen ("include ");
while (g_ascii_isspace (*p))
p++;
if (*p != '"')
goto error;
p++;
start = p;
while (*p && *p != '"')
p++;
if (*p != '"')
goto error;
end = p;
p++;
while (g_ascii_isspace (*p))
p++;
if (*p && *p != '#')
goto error;
if (end - start == 2 &&
strncmp ("%L", start, end - start) == 0)
{
parser_add_default_sequences (parser);
}
else
{
path = handle_substitutions (start, end - start);
parser_parse_file (parser, path);
g_free (path);
}
return;
error:
g_warning ("Could not parse include: %s", line);
}
static void
parser_parse_line (GtkComposeParser *parser,
const char *line)
{
char **components = NULL;
gunichar *sequence = NULL;
char *value = NULL;
if (line[0] == '\0' || line[0] == '#')
return;
if (g_str_has_prefix (line, "include "))
{
parser_handle_include (parser, line);
return;
}
components = g_strsplit (line, ":", 2);
if (components[1] == NULL)
{
g_warning ("No delimiter ':': %s", line);
goto fail;
}
sequence = parse_compose_sequence (g_strstrip (components[0]), line);
if (sequence == NULL)
goto fail;
value = parse_compose_value (g_strstrip (components[1]), line);
if (value == NULL)
goto fail;
g_strfreev (components);
g_hash_table_replace (parser->sequences, sequence, value);
return;
fail:
g_strfreev (components);
g_free (sequence);
g_free (value);
}
static void
parser_read_file (GtkComposeParser *parser,
const char *compose_file)
{
char *contents = NULL;
char **lines = NULL;
gsize length = 0;
GError *error = NULL;
if (!g_file_get_contents (compose_file, &contents, &length, &error))
{
g_warning ("%s", error->message);
g_error_free (error);
return;
}
lines = g_strsplit (contents, "\n", -1);
for (int i = 0; lines[i] != NULL; i++)
parser_parse_line (parser, lines[i]);
g_strfreev (lines);
g_free (contents);
}
/* Remove sequences that can be handled algorithmically,
* sequences with non-BMP keys, and sequences that produce
* empty strings.
*/
static void
parser_remove_duplicates (GtkComposeParser *parser)
{
GHashTableIter iter;
gunichar *sequence;
char *value;
g_hash_table_iter_init (&iter, parser->sequences);
while (g_hash_table_iter_next (&iter, (gpointer *)&sequence, (gpointer *)&value))
{
static guint16 keysyms[MAX_COMPOSE_LEN + 1];
int i;
int n_compose = 0;
gunichar output_char;
char buf[8] = { 0, };
gboolean remove_sequence = FALSE;
if (value[0] == '\0')
{
remove_sequence = TRUE;
goto next;
}
if (sequence[1] == 0)
{
remove_sequence = TRUE;
goto next;
}
for (i = 0; i < MAX_COMPOSE_LEN + 1; i++)
keysyms[i] = 0;
for (i = 0; i < MAX_COMPOSE_LEN + 1; i++)
{
gunichar codepoint = sequence[i];
keysyms[i] = (guint16) codepoint;
if (codepoint == 0)
break;
if (codepoint > 0xffff)
{
remove_sequence = TRUE;
goto next;
}
n_compose++;
}
if (gtk_check_algorithmically (keysyms, n_compose, &output_char))
{
g_unichar_to_utf8 (output_char, buf);
if (strcmp (value, buf) == 0)
remove_sequence = TRUE;
}
next:
if (remove_sequence)
g_hash_table_iter_remove (&iter);
}
}
static void
parser_compute_max_compose_len (GtkComposeParser *parser,
int *max_compose_len,
int *n_first,
int *size)
{
GHashTableIter iter;
gunichar *sequence;
char *value;
int max = 0;
int count = 0;
GHashTable *first;
first = g_hash_table_new (NULL, NULL);
g_hash_table_iter_init (&iter, parser->sequences);
while (g_hash_table_iter_next (&iter, (gpointer *)&sequence, (gpointer *)&value))
{
g_hash_table_add (first, GUINT_TO_POINTER (sequence[0]));
for (int i = 0; i < MAX_COMPOSE_LEN + 1; i++)
{
if (sequence[i] == 0)
{
count += i;
if (max < i)
max = i;
break;
}
}
}
*max_compose_len = max;
*n_first = g_hash_table_size (first);
*size = count;
g_hash_table_unref (first);
}
static inline int
sequence_length (gpointer a)
{
gunichar *seq = a;
int i;
for (i = 0; seq[i]; i++) ;
return i;
}
static int
sequence_compare (gpointer a,
gpointer b,
gpointer data)
{
gunichar *seq_a = a;
gunichar *seq_b = b;
int i;
gunichar code_a, code_b;
int len_a, len_b;
code_a = seq_a[0];
code_b = seq_b[0];
if (code_a != code_b)
return code_a - code_b;
len_a = sequence_length (a);
len_b = sequence_length (b);
if (len_a != len_b)
return len_a - len_b;
for (i = 1; i < len_a; i++)
{
code_a = seq_a[i];
code_b = seq_b[i];
if (code_a != code_b)
return code_a - code_b;
}
return 0;
}
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 header_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 n_index_size = compose_table->n_index_size;
guint16 data_size = compose_table->data_size;
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 (n_index_size > 0, NULL);
header_length = strlen (header);
total_length = header_length + sizeof (guint16) * (5 + data_size) + n_chars;
if (count)
*count = total_length;
p = contents = g_malloc (total_length);
memcpy (p, header, header_length);
p += header_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_index_size);
APPEND_GUINT16 (data_size);
APPEND_GUINT16 (n_chars);
for (i = 0; i < data_size; 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,
gboolean *found_old_cache)
{
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 n_index_size;
guint16 data_size;
guint16 n_chars;
guint32 i;
guint16 *data = NULL;
char *char_data = NULL;
GtkComposeTable *retval;
*found_old_cache = FALSE;
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)
{
if (version < GTK_COMPOSE_TABLE_VERSION)
*found_old_cache = TRUE;
goto out_load_cache;
}
GET_GUINT16 (max_seq_len);
GET_GUINT16 (n_index_size);
GET_GUINT16 (data_size);
GET_GUINT16 (n_chars);
if (max_seq_len == 0 || data_size == 0)
{
g_warning ("cache size is not correct %d %d", max_seq_len, data_size);
goto out_load_cache;
}
data = g_new0 (guint16, data_size);
for (i = 0; i < data_size; i++)
{
GET_GUINT16 (data[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 = data;
retval->max_seq_len = max_seq_len;
retval->n_index_size = n_index_size;
retval->data_size = data_size;
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 (data);
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 *
parser_get_compose_table (GtkComposeParser *parser)
{
guint16 *data;
GtkComposeTable *table;
guint16 encoded_value;
GString *char_data;
int max_compose_len;
GList *sequences;
GList *list;
int i;
int size;
int n_first;
int first_pos;
int rest_pos;
int index_rowstride;
int n_sequences;
gunichar current_first;
parser_remove_duplicates (parser);
if (g_hash_table_size (parser->sequences) == 0)
return NULL;
parser_compute_max_compose_len (parser, &max_compose_len, &n_first, &size);
sequences = g_hash_table_get_keys (parser->sequences);
sequences = g_list_sort_with_data (sequences,
(GCompareDataFunc) sequence_compare,
NULL);
index_rowstride = max_compose_len + 1;
data = g_new0 (guint16, n_first * index_rowstride + size);
char_data = g_string_new ("");
n_sequences = 0;
current_first = 0;
first_pos = 0;
rest_pos = n_first * index_rowstride;
for (list = sequences; list != NULL; list = list->next)
{
gunichar *sequence = list->data;
char *value = g_hash_table_lookup (parser->sequences, sequence);
int len = sequence_length (sequence);
g_assert (2 <= len && len <= max_compose_len);
/* Encode the value. If the value is a single
* character with a value smaller than 1 << 15,
* we just use it directly.
* Otherwise, we store the value as string and
* put the offset into the table, with the high
* bit set.
*/
if (g_utf8_strlen (value, -1) == 1 &&
g_utf8_get_char (value) < 0x8000)
{
encoded_value = (guint16) g_utf8_get_char (value);
}
else
{
g_assert (strlen (value) < 20);
if (char_data->len > 0)
g_string_append_c (char_data, 0);
g_assert (char_data->len < 0x8000);
encoded_value = (guint16) (char_data->len | 0x8000);
g_string_append (char_data, value);
}
if (sequence[0] != current_first)
{
g_assert (sequence[0] <= 0xffff);
if (current_first != 0)
first_pos += index_rowstride;
current_first = (guint16)sequence[0];
data[first_pos] = (guint16)sequence[0];
for (i = 1; i < index_rowstride; i++)
data[first_pos + i] = rest_pos;
}
for (i = 1; i < len; i++)
{
g_assert (sequence[i] != 0);
g_assert (sequence[i] <= 0xffff);
data[rest_pos + i - 1] = (guint16) sequence[i];
}
g_assert (encoded_value != 0);
data[rest_pos + len - 1] = encoded_value;
n_sequences++;
rest_pos += len;
for (i = len; i <= max_compose_len; i++)
data[first_pos + i] = rest_pos;
for (i = 1; i < max_compose_len; i++)
g_assert (data[first_pos + i] <= data[first_pos + i + 1]);
}
g_assert (first_pos + index_rowstride == n_first * index_rowstride);
g_assert (rest_pos == n_first * index_rowstride + size);
if (char_data->len > 0)
g_string_append_c (char_data, 0);
table = g_new0 (GtkComposeTable, 1);
table->data = data;
table->data_size = n_first * index_rowstride + size;
table->max_seq_len = max_compose_len;
table->n_index_size = n_first;
table->n_chars = char_data->len;
table->char_data = g_string_free (char_data, FALSE);
table->n_sequences = n_sequences;
table->id = g_str_hash (parser->compose_file);
g_list_free (sequences);
return table;
}
static char *
canonicalize_filename (const char *parent_path,
const char *path)
{
GFile *file;
char *retval;
if (path[0] != '/' && parent_path)
{
GFile *orig = g_file_new_for_path (parent_path);
GFile *parent = g_file_get_parent (orig);
file = g_file_resolve_relative_path (parent, path);
g_object_unref (parent);
g_object_unref (orig);
}
else
{
file = g_file_new_for_path (path);
}
retval = g_file_get_path (file);
g_object_unref (file);
return retval;
}
static void
parser_parse_file (GtkComposeParser *parser,
const char *compose_file)
{
char *path;
// stash the name for the table hash
if (parser->compose_file == NULL)
parser->compose_file = compose_file;
path = canonicalize_filename (parser->compose_file, compose_file);
if (g_list_find_custom (parser->files, path, (GCompareFunc)strcmp))
{
g_warning ("include cycle detected: %s", compose_file);
g_free (path);
return;
}
parser->files = g_list_prepend (parser->files, path);
parser_read_file (parser, path);
parser->files = g_list_remove (parser->files, path);
}
GtkComposeTable *
gtk_compose_table_parse (const char *compose_file,
gboolean *found_include)
{
GtkComposeParser *parser;
GtkComposeTable *compose_table;
parser = parser_new ();
parser_parse_file (parser, compose_file);
compose_table = parser_get_compose_table (parser);
if (found_include)
*found_include = parser->found_include;
parser_free (parser);
return compose_table;
}
static const char *prefix =
"# GTK has rewritten this file to add the line:\n"
"\n"
"include \"%L\"\n"
"\n"
"# This is necessary to add your own Compose sequences\n"
"# in addition to the builtin sequences of GTK. If this\n"
"# is not what you want, just remove that line.\n"
"#\n"
"# A backup of the previous file contents has been made.\n"
"\n"
"\n";
static gboolean
rewrite_compose_file (const char *compose_file)
{
char *path = NULL;
char *content = NULL;
gsize content_len;
GFile *file = NULL;
GOutputStream *stream = NULL;
gboolean ret = FALSE;
path = canonicalize_filename (NULL, compose_file);
if (!g_file_get_contents (path, &content, &content_len, NULL))
goto out;
file = g_file_new_for_path (path);
stream = G_OUTPUT_STREAM (g_file_replace (file, NULL, TRUE, 0, NULL, NULL));
if (stream == NULL)
goto out;
if (!g_output_stream_write (stream, prefix, strlen (prefix), NULL, NULL))
goto out;
if (!g_output_stream_write (stream, content, content_len, NULL, NULL))
goto out;
if (!g_output_stream_close (stream, NULL, NULL))
goto out;
ret = TRUE;
out:
g_clear_object (&stream);
g_clear_object (&file);
g_clear_pointer (&path, g_free);
g_clear_pointer (&content, g_free);
return ret;
}
GtkComposeTable *
gtk_compose_table_new_with_file (const char *compose_file)
{
GtkComposeTable *compose_table;
gboolean found_old_cache = FALSE;
gboolean found_include = FALSE;
g_assert (compose_file != NULL);
compose_table = gtk_compose_table_load_cache (compose_file, &found_old_cache);
if (compose_table != NULL)
return compose_table;
parse:
compose_table = gtk_compose_table_parse (compose_file, &found_include);
/* This is where we apply heuristics to avoid breaking users existing configurations
* with the change to not always add the default sequences.
*
* If we find a cache that was generated before 4.4, and the Compose file
* does not have an include, and doesn't contain so many sequences that it
* is probably a copy of the system one, we take steps to keep things working,
* and thell the user about it.
*/
if (found_old_cache && !found_include && compose_table->n_sequences < 100)
{
if (rewrite_compose_file (compose_file))
{
g_warning ("\nSince GTK 4.4, Compose files replace the builtin\n"
"compose sequences. To keep them and add your own\n"
"sequences on top, the line:\n"
"\n"
" include \"%%L\"\n"
"\n"
"has been added to the Compose file\n%s.\n", compose_file);
goto parse;
}
else
{
g_warning ("\nSince GTK 4.4, Compose files replace the builtin\n"
"compose sequences. To keep them and add your own\n"
"sequences on top, you need to add the line:\n"
"\n"
" include \"%%L\"\n"
"\n"
"to the Compose file\n%s.\n", compose_file);
}
}
if (compose_table != NULL)
gtk_compose_table_save_cache (compose_table);
return compose_table;
}
GtkComposeTable *
gtk_compose_table_new_with_data (const guint16 *data,
int max_seq_len,
int n_seqs)
{
GtkComposeParser *parser;
GtkComposeTable *compose_table;
int i;
parser = parser_new ();
for (i = 0; i < n_seqs; i++)
{
const guint16 *seq = data + i * (max_seq_len + 2);
guint16 *sequence;
gunichar ch;
char buf[8] = { 0, };
sequence = g_new0 (guint16, max_seq_len + 1);
memcpy (sequence, seq, sizeof (guint16) * max_seq_len);
ch = ((gunichar)seq[max_seq_len]) << 16 | (gunichar)seq[max_seq_len + 1];
g_unichar_to_utf8 (ch, buf);
g_hash_table_replace (parser->sequences, sequence, g_strdup (buf));
}
compose_table = parser_get_compose_table (parser);
parser_free (parser);
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;
}
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;
}
/*
* 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;
guint16 *seq_index;
guint16 *seq;
int i;
gboolean match;
gunichar value;
if (compose_finish)
*compose_finish = FALSE;
if (compose_match)
*compose_match = FALSE;
/* 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->max_seq_len + 1),
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];
if ((value & (1 << 15)) != 0)
g_string_append (output, &table->char_data[value & ~(1 << 15)]);
else
g_string_append_unichar (output, value);
match = TRUE;
}
else
{
if (match)
{
if (compose_match)
*compose_match = TRUE;
}
return TRUE;
}
}
}
}
if (match)
{
if (compose_match)
*compose_match = TRUE;
if (compose_finish)
*compose_finish = TRUE;
return TRUE;
}
return FALSE;
}
void
gtk_compose_table_foreach (const GtkComposeTable *table,
GtkComposeSequenceCallback callback,
gpointer data)
{
int index_stride = table->max_seq_len + 1;
gunichar *sequence;
int seqno;
sequence = g_new0 (gunichar, table->max_seq_len + 1);
seqno = 0;
for (int idx = 0; idx < table->n_index_size; idx++)
{
const guint16 *seq_index = table->data + (idx * index_stride);
for (int i = 1; i < table->max_seq_len; i++)
{
int len = i + 1;
g_assert (seq_index[i] <= seq_index[i + 1]);
g_assert (seq_index[i + 1] <= table->data_size);
g_assert ((seq_index[i + 1] - seq_index[i]) % len == 0);
for (int j = seq_index[i]; j < seq_index[i + 1]; j += len)
{
char buf[8] = { 0, };
guint16 encoded_value;
char *value;
sequence[0] = seq_index[0];
for (int k = 0; k < len - 1; k++)
sequence[k + 1] = (gunichar) table->data[j + k];
sequence[len] = 0;
encoded_value = table->data[j + len - 1];
g_assert (encoded_value != 0);
if ((encoded_value & (1 << 15)) != 0)
{
int char_offset = encoded_value & ~(1 << 15);
g_assert (char_offset < table->n_chars);
value = &table->char_data[char_offset];
g_assert (strlen (value) < 20);
}
else
{
g_unichar_to_utf8 ((gunichar)encoded_value, buf);
value = buf;
}
callback (sequence, len, value, data);
seqno++;
}
}
}
g_free (sequence);
}
/* 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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