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gtk2/gtk/gtkimcontextsimple.c
Руслан Ижбулатов 5e6c1928b4 W32: Prefer the deadkey combinations that the OS uses 
Pick the W32 API for possible deadkey+<something> combinations
and prefer these to other sources of deadkey combos.
Specifically, if W32 API supports at least one combo for a particular
deadkey, only use that data and do not attempt to do other, unsupported
combinations, even if they make sense otherwise.
This is needed to, for example, correctly support US-International
keyboard layout, which produces a combined character for <' + a>
combo, but not for <' + s>, for example.

This is achieved by stashing all the deadkeys that we find in
an array, then doing extra loop through all virtual key codes and
trying to combine them with each of these deadkeys. Any combinations
that produce a single character are cached for later use.

In GTK Simple IM context, call a new GDK W32 function to do a lookup
on that cached combination table early on, among the "special cases"
(which are now partially obsolete).

A limitation of this code is that combinations with more than
one deadkey are not supported, except for combinations that consist
entirely of 2 known deadkeys. The upshot is that lookups should
be relatively fast, as deadkey array stays small and the combination
tree stays shallow.

Note that the use of ToUnicodeEx() seems suboptimal, as it should
be possible to just load a keyboard library (KBD*.DLL) manually
and obtain and use its key table directly. However, that is much more
complicated and would result in a significant rewrite of gdkkeys-win32.
The code from this commit, though hacky, is a direct addition to
existing code and should cover vast majority of the use-cases.

https://bugzilla.gnome.org/show_bug.cgi?id=569581
2016-08-04 16:37:19 +00:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2000 Red Hat, Inc.
*
* 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 "config.h"
#include <gdk/gdk.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif
#ifdef GDK_WINDOWING_WAYLAND
#include <wayland/gdkwayland.h>
#endif
#ifdef GDK_WINDOWING_WIN32
#include <win32/gdkwin32.h>
#endif
#include <stdlib.h>
#include <string.h>
#include "gtkprivate.h"
#include "gtkaccelgroup.h"
#include "gtkimcontextsimple.h"
#include "gtksettings.h"
#include "gtkwidget.h"
#include "gtkdebug.h"
#include "gtkintl.h"
#include "gtkcomposetable.h"
#include "gtkimcontextsimpleprivate.h"
#include "gtkimcontextsimpleseqs.h"
/**
* SECTION:gtkimcontextsimple
* @Short_description: An input method context supporting table-based input methods
* @Title: GtkIMContextSimple
*
* GtkIMContextSimple is a simple input method context supporting table-based
* input methods. It has a built-in table of compose sequences that is derived
* from the X11 Compose files.
*
* GtkIMContextSimple reads additional compose sequences from the first of the
* following files that is found: ~/.config/gtk-3.0/Compose, ~/.XCompose,
* /usr/share/X11/locale/$locale/Compose (for locales that have a nontrivial
* Compose file). The syntax of these files is described in the Compose(5)
* manual page.
*
* GtkIMContextSimple also supports numeric entry of Unicode characters
* by typing Ctrl-Shift-u, followed by a hexadecimal Unicode codepoint.
* For example, Ctrl-Shift-u 1 2 3 Enter yields U+0123 LATIN SMALL LETTER
* G WITH CEDILLA, i.e. ģ.
*/
struct _GtkIMContextSimplePrivate
{
guint16 compose_buffer[GTK_MAX_COMPOSE_LEN + 1];
gunichar tentative_match;
gint tentative_match_len;
guint in_hex_sequence : 1;
guint modifiers_dropped : 1;
};
/* From the values below, the value 30 means the number of different first keysyms
* that exist in the Compose file (from Xorg). When running compose-parse.py without
* parameters, you get the count that you can put here. Needed when updating the
* gtkimcontextsimpleseqs.h header file (contains the compose sequences).
*/
const GtkComposeTableCompact gtk_compose_table_compact = {
gtk_compose_seqs_compact,
5,
30,
6
};
G_LOCK_DEFINE_STATIC (global_tables);
static GSList *global_tables;
static const guint16 gtk_compose_ignore[] = {
GDK_KEY_Shift_L,
GDK_KEY_Shift_R,
GDK_KEY_Control_L,
GDK_KEY_Control_R,
GDK_KEY_Caps_Lock,
GDK_KEY_Shift_Lock,
GDK_KEY_Meta_L,
GDK_KEY_Meta_R,
GDK_KEY_Alt_L,
GDK_KEY_Alt_R,
GDK_KEY_Super_L,
GDK_KEY_Super_R,
GDK_KEY_Hyper_L,
GDK_KEY_Hyper_R,
GDK_KEY_Mode_switch,
GDK_KEY_ISO_Level3_Shift
};
static void gtk_im_context_simple_finalize (GObject *obj);
static gboolean gtk_im_context_simple_filter_keypress (GtkIMContext *context,
GdkEventKey *key);
static void gtk_im_context_simple_reset (GtkIMContext *context);
static void gtk_im_context_simple_get_preedit_string (GtkIMContext *context,
gchar **str,
PangoAttrList **attrs,
gint *cursor_pos);
static void gtk_im_context_simple_set_client_window (GtkIMContext *context,
GdkWindow *window);
G_DEFINE_TYPE_WITH_PRIVATE (GtkIMContextSimple, gtk_im_context_simple, GTK_TYPE_IM_CONTEXT)
static void
gtk_im_context_simple_class_init (GtkIMContextSimpleClass *class)
{
GtkIMContextClass *im_context_class = GTK_IM_CONTEXT_CLASS (class);
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
im_context_class->filter_keypress = gtk_im_context_simple_filter_keypress;
im_context_class->reset = gtk_im_context_simple_reset;
im_context_class->get_preedit_string = gtk_im_context_simple_get_preedit_string;
im_context_class->set_client_window = gtk_im_context_simple_set_client_window;
gobject_class->finalize = gtk_im_context_simple_finalize;
}
static gchar*
get_x11_compose_file_dir (void)
{
gchar* compose_file_dir;
#if defined (GDK_WINDOWING_X11) || defined (GDK_WINDOWING_WAYLAND)
compose_file_dir = g_strdup (X11_DATA_PREFIX "/share/X11/locale");
#else
compose_file_dir = g_build_filename (_gtk_get_datadir (), "X11", "locale", NULL);
#endif
return compose_file_dir;
}
static void
gtk_im_context_simple_init_compose_table (GtkIMContextSimple *im_context_simple)
{
gchar *path = NULL;
const gchar *home;
const gchar *locale;
gchar **langs = NULL;
gchar **lang = NULL;
gchar * const sys_langs[] = { "el_gr", "fi_fi", "pt_br", NULL };
gchar * const *sys_lang = NULL;
gchar *x11_compose_file_dir = get_x11_compose_file_dir ();
path = g_build_filename (g_get_user_config_dir (), "gtk-3.0", "Compose", NULL);
if (g_file_test (path, G_FILE_TEST_EXISTS))
{
gtk_im_context_simple_add_compose_file (im_context_simple, path);
g_free (path);
return;
}
g_free (path);
path = NULL;
home = g_get_home_dir ();
if (home == NULL)
return;
path = g_build_filename (home, ".XCompose", NULL);
if (g_file_test (path, G_FILE_TEST_EXISTS))
{
gtk_im_context_simple_add_compose_file (im_context_simple, path);
g_free (path);
return;
}
g_free (path);
path = NULL;
locale = g_getenv ("LC_CTYPE");
if (locale == NULL)
locale = g_getenv ("LANG");
if (locale == NULL)
locale = "C";
/* FIXME: https://bugzilla.gnome.org/show_bug.cgi?id=751826 */
langs = g_get_locale_variants (locale);
for (lang = langs; *lang; lang++)
{
if (g_str_has_prefix (*lang, "en_US"))
break;
if (**lang == 'C')
break;
/* Other languages just include en_us compose table. */
for (sys_lang = sys_langs; *sys_lang; sys_lang++)
{
if (g_ascii_strncasecmp (*lang, *sys_lang, strlen (*sys_lang)) == 0)
{
path = g_build_filename (x11_compose_file_dir, *lang, "Compose", NULL);
break;
}
}
if (path == NULL)
continue;
if (g_file_test (path, G_FILE_TEST_EXISTS))
break;
g_free (path);
path = NULL;
}
g_free (x11_compose_file_dir);
g_strfreev (langs);
if (path != NULL)
gtk_im_context_simple_add_compose_file (im_context_simple, path);
g_free (path);
path = NULL;
}
static void
init_compose_table_thread_cb (GTask *task,
gpointer source_object,
gpointer task_data,
GCancellable *cancellable)
{
if (g_task_return_error_if_cancelled (task))
return;
g_return_if_fail (GTK_IS_IM_CONTEXT_SIMPLE (task_data));
gtk_im_context_simple_init_compose_table (GTK_IM_CONTEXT_SIMPLE (task_data));
}
void
init_compose_table_async (GtkIMContextSimple *im_context_simple,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task = g_task_new (NULL, cancellable, callback, user_data);
g_task_set_source_tag (task, init_compose_table_async);
g_task_set_task_data (task, g_object_ref (im_context_simple), g_object_unref);
g_task_run_in_thread (task, init_compose_table_thread_cb);
g_object_unref (task);
}
static void
gtk_im_context_simple_init (GtkIMContextSimple *im_context_simple)
{
im_context_simple->priv = gtk_im_context_simple_get_instance_private (im_context_simple);
}
static void
gtk_im_context_simple_finalize (GObject *obj)
{
G_OBJECT_CLASS (gtk_im_context_simple_parent_class)->finalize (obj);
}
/**
* gtk_im_context_simple_new:
*
* Creates a new #GtkIMContextSimple.
*
* Returns: a new #GtkIMContextSimple.
**/
GtkIMContext *
gtk_im_context_simple_new (void)
{
return g_object_new (GTK_TYPE_IM_CONTEXT_SIMPLE, NULL);
}
static void
gtk_im_context_simple_commit_char (GtkIMContext *context,
gunichar ch)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
gchar buf[10];
gint len;
g_return_if_fail (g_unichar_validate (ch));
len = g_unichar_to_utf8 (ch, buf);
buf[len] = '\0';
if (priv->tentative_match || priv->in_hex_sequence)
{
priv->in_hex_sequence = FALSE;
priv->tentative_match = 0;
priv->tentative_match_len = 0;
g_signal_emit_by_name (context_simple, "preedit-changed");
g_signal_emit_by_name (context_simple, "preedit-end");
}
g_signal_emit_by_name (context, "commit", &buf);
}
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;
}
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 gboolean
check_table (GtkIMContextSimple *context_simple,
const GtkComposeTable *table,
gint n_compose)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
gint row_stride = table->max_seq_len + 2;
guint16 *seq;
/* 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 (priv->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 (priv->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 =
0x10000 * seq[table->max_seq_len] + seq[table->max_seq_len + 1];
/* 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 (priv->compose_buffer, next_seq) == 0)
{
priv->tentative_match = value;
priv->tentative_match_len = n_compose;
g_signal_emit_by_name (context_simple, "preedit-changed");
return TRUE;
}
}
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple), value);
priv->compose_buffer[0] = 0;
}
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.
* Currently, the upper limit is GDK_KEY_dead_dasia+1. The +1 has to do with
* a temporary issue in the X.Org header files.
* In future versions it will be just the keysym (no +1).
*/
#define IS_DEAD_KEY(k) \
((k) >= GDK_KEY_dead_grave && (k) <= (GDK_KEY_dead_dasia+1))
#ifdef GDK_WINDOWING_WIN32
/* On Windows, user expectation is that typing a dead accent followed
* by space will input the corresponding spacing character. The X
* compose tables are different for dead acute and diaeresis, which
* when followed by space produce a plain ASCII apostrophe and double
* quote respectively. So special-case those.
*/
static gboolean
check_win32_special_cases (GtkIMContextSimple *context_simple,
gint n_compose)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
if (n_compose == 2 &&
priv->compose_buffer[1] == GDK_KEY_space)
{
gunichar value = 0;
switch (priv->compose_buffer[0])
{
case GDK_KEY_dead_acute:
value = 0x00B4; break;
case GDK_KEY_dead_diaeresis:
value = 0x00A8; break;
}
if (value > 0)
{
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple), value);
priv->compose_buffer[0] = 0;
return TRUE;
}
}
return FALSE;
}
static void
check_win32_special_case_after_compact_match (GtkIMContextSimple *context_simple,
gint n_compose,
guint value)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
/* On Windows user expectation is that typing two dead accents will input
* two corresponding spacing accents.
*/
if (n_compose == 2 &&
priv->compose_buffer[0] == priv->compose_buffer[1] &&
IS_DEAD_KEY (priv->compose_buffer[0]))
{
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple), value);
}
}
#endif
#ifdef GDK_WINDOWING_QUARTZ
static gboolean
check_quartz_special_cases (GtkIMContextSimple *context_simple,
gint n_compose)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
guint value = 0;
if (n_compose == 2)
{
switch (priv->compose_buffer[0])
{
case GDK_KEY_dead_doubleacute:
switch (priv->compose_buffer[1])
{
case GDK_KEY_dead_doubleacute:
case GDK_KEY_space:
value = GDK_KEY_quotedbl; break;
case 'a': value = GDK_KEY_adiaeresis; break;
case 'A': value = GDK_KEY_Adiaeresis; break;
case 'e': value = GDK_KEY_ediaeresis; break;
case 'E': value = GDK_KEY_Ediaeresis; break;
case 'i': value = GDK_KEY_idiaeresis; break;
case 'I': value = GDK_KEY_Idiaeresis; break;
case 'o': value = GDK_KEY_odiaeresis; break;
case 'O': value = GDK_KEY_Odiaeresis; break;
case 'u': value = GDK_KEY_udiaeresis; break;
case 'U': value = GDK_KEY_Udiaeresis; break;
case 'y': value = GDK_KEY_ydiaeresis; break;
case 'Y': value = GDK_KEY_Ydiaeresis; break;
}
break;
case GDK_KEY_dead_acute:
switch (priv->compose_buffer[1])
{
case 'c': value = GDK_KEY_ccedilla; break;
case 'C': value = GDK_KEY_Ccedilla; break;
}
break;
}
}
if (value > 0)
{
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple),
gdk_keyval_to_unicode (value));
priv->compose_buffer[0] = 0;
return TRUE;
}
return FALSE;
}
#endif
gboolean
gtk_check_compact_table (const GtkComposeTableCompact *table,
guint16 *compose_buffer,
gint n_compose,
gboolean *compose_finish,
gboolean *compose_match,
gunichar *output_char)
{
gint row_stride;
guint16 *seq_index;
guint16 *seq;
gint 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 (seq_index && 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;
}
/* 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, gint n_compose)
{
gunichar combination_buffer_temp[GTK_MAX_COMPOSE_LEN];
gchar *combination_utf8_temp = NULL;
gchar *nfc_temp = NULL;
gint n_combinations;
gunichar temp_swap;
gint i;
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, GTK_MAX_COMPOSE_LEN * 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, -1, 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, GTK_MAX_COMPOSE_LEN * 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,
gint n_compose,
gunichar *output_char)
{
gint i;
gunichar combination_buffer[GTK_MAX_COMPOSE_LEN];
gchar *combination_utf8, *nfc;
if (output_char)
*output_char = 0;
if (n_compose >= GTK_MAX_COMPOSE_LEN)
return FALSE;
for (i = 0; i < n_compose && IS_DEAD_KEY (compose_buffer[i]); i++)
;
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 (hook, 0x0309);
CASE (abovering, 0x030A);
CASE (doubleacute, 0x030B);
CASE (caron, 0x030C);
CASE (abovecomma, 0x0313); /* Equivalent to psili */
CASE (abovereversedcomma, 0x0314); /* Equivalent to dasia */
CASE (horn, 0x031B); /* Legacy use for psili, 0x313 (or 0x343). */
CASE (belowdot, 0x0323);
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. */
/* The following cases are to be removed once xkeyboard-config,
* xorg are fully updated.
*/
/* Workaround for typo in 1.4.x xserver-xorg */
case 0xfe66: combination_buffer[i+1] = 0x314; break;
/* CASE (dasia, 0x314); */
/* CASE (perispomeni, 0x342); */
/* CASE (psili, 0x343); */
#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;
}
/* In addition to the table-driven sequences, we allow Unicode hex
* codes to be entered. The method chosen here is similar to the
* one recommended in ISO 14755, but not exactly the same, since we
* don’t want to steal 16 valuable key combinations.
*
* A hex Unicode sequence must be started with Ctrl-Shift-U, followed
* by a sequence of hex digits entered with Ctrl-Shift still held.
* Releasing one of the modifiers or pressing space while the modifiers
* are still held commits the character. It is possible to erase
* digits using backspace.
*
* As an extension to the above, we also allow to start the sequence
* with Ctrl-Shift-U, then release the modifiers before typing any
* digits, and enter the digits without modifiers.
*/
static gboolean
check_hex (GtkIMContextSimple *context_simple,
gint n_compose)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
/* See if this is a hex sequence, return TRUE if so */
gint i;
GString *str;
gulong n;
gchar *nptr = NULL;
gchar buf[7];
priv->tentative_match = 0;
priv->tentative_match_len = 0;
str = g_string_new (NULL);
i = 0;
while (i < n_compose)
{
gunichar ch;
ch = gdk_keyval_to_unicode (priv->compose_buffer[i]);
if (ch == 0)
return FALSE;
if (!g_unichar_isxdigit (ch))
return FALSE;
buf[g_unichar_to_utf8 (ch, buf)] = '\0';
g_string_append (str, buf);
++i;
}
n = strtoul (str->str, &nptr, 16);
/* If strtoul fails it probably means non-latin digits were used;
* we should in principle handle that, but we probably don't.
*/
if (nptr - str->str < str->len)
{
g_string_free (str, TRUE);
return FALSE;
}
else
g_string_free (str, TRUE);
if (g_unichar_validate (n))
{
priv->tentative_match = n;
priv->tentative_match_len = n_compose;
}
return TRUE;
}
static void
beep_window (GdkWindow *window)
{
GdkScreen *screen = gdk_window_get_screen (window);
gboolean beep;
g_object_get (gtk_settings_get_for_screen (screen),
"gtk-error-bell", &beep,
NULL);
if (beep)
gdk_window_beep (window);
}
static gboolean
no_sequence_matches (GtkIMContextSimple *context_simple,
gint n_compose,
GdkEventKey *event)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
GtkIMContext *context;
gunichar ch;
context = GTK_IM_CONTEXT (context_simple);
/* No compose sequences found, check first if we have a partial
* match pending.
*/
if (priv->tentative_match)
{
gint len = priv->tentative_match_len;
int i;
gtk_im_context_simple_commit_char (context, priv->tentative_match);
priv->compose_buffer[0] = 0;
for (i=0; i < n_compose - len - 1; i++)
{
GdkEvent *tmp_event = gdk_event_copy ((GdkEvent *)event);
tmp_event->key.keyval = priv->compose_buffer[len + i];
gtk_im_context_filter_keypress (context, (GdkEventKey *)tmp_event);
gdk_event_free (tmp_event);
}
return gtk_im_context_filter_keypress (context, event);
}
else
{
priv->compose_buffer[0] = 0;
if (n_compose > 1) /* Invalid sequence */
{
beep_window (event->window);
return TRUE;
}
ch = gdk_keyval_to_unicode (event->keyval);
if (ch != 0 && !g_unichar_iscntrl (ch))
{
gtk_im_context_simple_commit_char (context, ch);
return TRUE;
}
else
return FALSE;
}
}
static gboolean
is_hex_keyval (guint keyval)
{
gunichar ch = gdk_keyval_to_unicode (keyval);
return g_unichar_isxdigit (ch);
}
static guint
canonical_hex_keyval (GdkEventKey *event)
{
GdkKeymap *keymap = gdk_keymap_get_for_display (gdk_window_get_display (event->window));
guint keyval;
guint *keyvals = NULL;
gint n_vals = 0;
gint i;
/* See if the keyval is already a hex digit */
if (is_hex_keyval (event->keyval))
return event->keyval;
/* See if this key would have generated a hex keyval in
* any other state, and return that hex keyval if so
*/
gdk_keymap_get_entries_for_keycode (keymap,
event->hardware_keycode,
NULL,
&keyvals, &n_vals);
keyval = 0;
i = 0;
while (i < n_vals)
{
if (is_hex_keyval (keyvals[i]))
{
keyval = keyvals[i];
break;
}
++i;
}
g_free (keyvals);
if (keyval)
return keyval;
else
/* No way to make it a hex digit
*/
return 0;
}
static gboolean
gtk_im_context_simple_filter_keypress (GtkIMContext *context,
GdkEventKey *event)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
GdkDisplay *display = gdk_window_get_display (event->window);
GSList *tmp_list;
int n_compose = 0;
GdkModifierType hex_mod_mask;
gboolean have_hex_mods;
gboolean is_hex_start;
gboolean is_hex_end;
gboolean is_backspace;
gboolean is_escape;
guint hex_keyval;
int i;
gboolean compose_finish;
gboolean compose_match;
gunichar output_char;
while (priv->compose_buffer[n_compose] != 0)
n_compose++;
if (event->type == GDK_KEY_RELEASE)
{
if (priv->in_hex_sequence &&
(event->keyval == GDK_KEY_Control_L || event->keyval == GDK_KEY_Control_R ||
event->keyval == GDK_KEY_Shift_L || event->keyval == GDK_KEY_Shift_R))
{
if (priv->tentative_match &&
g_unichar_validate (priv->tentative_match))
{
gtk_im_context_simple_commit_char (context, priv->tentative_match);
priv->compose_buffer[0] = 0;
}
else if (n_compose == 0)
{
priv->modifiers_dropped = TRUE;
}
else
{
/* invalid hex sequence */
beep_window (event->window);
priv->tentative_match = 0;
priv->in_hex_sequence = FALSE;
priv->compose_buffer[0] = 0;
g_signal_emit_by_name (context_simple, "preedit-changed");
g_signal_emit_by_name (context_simple, "preedit-end");
}
return TRUE;
}
else
return FALSE;
}
/* Ignore modifier key presses */
for (i = 0; i < G_N_ELEMENTS (gtk_compose_ignore); i++)
if (event->keyval == gtk_compose_ignore[i])
return FALSE;
hex_mod_mask = gdk_keymap_get_modifier_mask (gdk_keymap_get_for_display (display),
GDK_MODIFIER_INTENT_PRIMARY_ACCELERATOR);
hex_mod_mask |= GDK_SHIFT_MASK;
if (priv->in_hex_sequence && priv->modifiers_dropped)
have_hex_mods = TRUE;
else
have_hex_mods = (event->state & (hex_mod_mask)) == hex_mod_mask;
is_hex_start = event->keyval == GDK_KEY_U;
is_hex_end = (event->keyval == GDK_KEY_space ||
event->keyval == GDK_KEY_KP_Space ||
event->keyval == GDK_KEY_Return ||
event->keyval == GDK_KEY_ISO_Enter ||
event->keyval == GDK_KEY_KP_Enter);
is_backspace = event->keyval == GDK_KEY_BackSpace;
is_escape = event->keyval == GDK_KEY_Escape;
hex_keyval = canonical_hex_keyval (event);
/* If we are already in a non-hex sequence, or
* this keystroke is not hex modifiers + hex digit, don't filter
* key events with accelerator modifiers held down. We only treat
* Control and Alt as accel modifiers here, since Super, Hyper and
* Meta are often co-located with Mode_Switch, Multi_Key or
* ISO_Level3_Switch.
*/
if (!have_hex_mods ||
(n_compose > 0 && !priv->in_hex_sequence) ||
(n_compose == 0 && !priv->in_hex_sequence && !is_hex_start) ||
(priv->in_hex_sequence && !hex_keyval &&
!is_hex_start && !is_hex_end && !is_escape && !is_backspace))
{
GdkModifierType no_text_input_mask;
no_text_input_mask =
gdk_keymap_get_modifier_mask (gdk_keymap_get_for_display (display),
GDK_MODIFIER_INTENT_NO_TEXT_INPUT);
if (event->state & no_text_input_mask ||
(priv->in_hex_sequence && priv->modifiers_dropped &&
(event->keyval == GDK_KEY_Return ||
event->keyval == GDK_KEY_ISO_Enter ||
event->keyval == GDK_KEY_KP_Enter)))
{
return FALSE;
}
}
/* Handle backspace */
if (priv->in_hex_sequence && have_hex_mods && is_backspace)
{
if (n_compose > 0)
{
n_compose--;
priv->compose_buffer[n_compose] = 0;
check_hex (context_simple, n_compose);
}
else
{
priv->in_hex_sequence = FALSE;
}
g_signal_emit_by_name (context_simple, "preedit-changed");
if (!priv->in_hex_sequence)
g_signal_emit_by_name (context_simple, "preedit-end");
return TRUE;
}
/* Check for hex sequence restart */
if (priv->in_hex_sequence && have_hex_mods && is_hex_start)
{
if (priv->tentative_match &&
g_unichar_validate (priv->tentative_match))
{
gtk_im_context_simple_commit_char (context, priv->tentative_match);
priv->compose_buffer[0] = 0;
}
else
{
/* invalid hex sequence */
if (n_compose > 0)
beep_window (event->window);
priv->tentative_match = 0;
priv->in_hex_sequence = FALSE;
priv->compose_buffer[0] = 0;
}
}
/* Check for hex sequence start */
if (!priv->in_hex_sequence && have_hex_mods && is_hex_start)
{
priv->compose_buffer[0] = 0;
priv->in_hex_sequence = TRUE;
priv->modifiers_dropped = FALSE;
priv->tentative_match = 0;
g_signal_emit_by_name (context_simple, "preedit-start");
g_signal_emit_by_name (context_simple, "preedit-changed");
return TRUE;
}
/* Then, check for compose sequences */
if (priv->in_hex_sequence)
{
if (hex_keyval)
priv->compose_buffer[n_compose++] = hex_keyval;
else if (is_escape)
{
gtk_im_context_simple_reset (context);
return TRUE;
}
else if (!is_hex_end)
{
/* non-hex character in hex sequence */
beep_window (event->window);
return TRUE;
}
}
else
priv->compose_buffer[n_compose++] = event->keyval;
priv->compose_buffer[n_compose] = 0;
if (priv->in_hex_sequence)
{
/* If the modifiers are still held down, consider the sequence again */
if (have_hex_mods)
{
/* space or return ends the sequence, and we eat the key */
if (n_compose > 0 && is_hex_end)
{
if (priv->tentative_match &&
g_unichar_validate (priv->tentative_match))
{
gtk_im_context_simple_commit_char (context, priv->tentative_match);
priv->compose_buffer[0] = 0;
}
else
{
/* invalid hex sequence */
beep_window (event->window);
priv->tentative_match = 0;
priv->in_hex_sequence = FALSE;
priv->compose_buffer[0] = 0;
}
}
else if (!check_hex (context_simple, n_compose))
beep_window (event->window);
g_signal_emit_by_name (context_simple, "preedit-changed");
if (!priv->in_hex_sequence)
g_signal_emit_by_name (context_simple, "preedit-end");
return TRUE;
}
}
else
{
gboolean success = FALSE;
#ifdef GDK_WINDOWING_WIN32
guint16 output[2];
gsize output_size = 2;
switch (gdk_win32_keymap_check_compose (GDK_WIN32_KEYMAP (gdk_keymap_get_default ()),
priv->compose_buffer,
n_compose,
output, &output_size))
{
case GDK_WIN32_KEYMAP_MATCH_NONE:
break;
case GDK_WIN32_KEYMAP_MATCH_EXACT:
case GDK_WIN32_KEYMAP_MATCH_PARTIAL:
for (i = 0; i < output_size; i++)
{
output_char = gdk_keyval_to_unicode (output[i]);
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple),
output_char);
}
priv->compose_buffer[0] = 0;
return TRUE;
case GDK_WIN32_KEYMAP_MATCH_INCOMPLETE:
return TRUE;
}
#endif
G_LOCK (global_tables);
tmp_list = global_tables;
while (tmp_list)
{
if (check_table (context_simple, tmp_list->data, n_compose))
{
success = TRUE;
break;
}
tmp_list = tmp_list->next;
}
G_UNLOCK (global_tables);
if (success)
return TRUE;
#ifdef GDK_WINDOWING_WIN32
if (check_win32_special_cases (context_simple, n_compose))
return TRUE;
#endif
#ifdef GDK_WINDOWING_QUARTZ
if (check_quartz_special_cases (context_simple, n_compose))
return TRUE;
#endif
if (gtk_check_compact_table (&gtk_compose_table_compact,
priv->compose_buffer,
n_compose, &compose_finish,
&compose_match, &output_char))
{
if (compose_finish)
{
if (compose_match)
{
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple),
output_char);
#ifdef G_OS_WIN32
check_win32_special_case_after_compact_match (context_simple,
n_compose,
output_char);
#endif
priv->compose_buffer[0] = 0;
}
}
else
{
if (compose_match)
{
priv->tentative_match = output_char;
priv->tentative_match_len = n_compose;
}
if (output_char)
g_signal_emit_by_name (context_simple, "preedit-changed");
}
return TRUE;
}
if (gtk_check_algorithmically (priv->compose_buffer, n_compose, &output_char))
{
if (output_char)
{
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple),
output_char);
priv->compose_buffer[0] = 0;
}
return TRUE;
}
}
/* The current compose_buffer doesn't match anything */
return no_sequence_matches (context_simple, n_compose, event);
}
static void
gtk_im_context_simple_reset (GtkIMContext *context)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
priv->compose_buffer[0] = 0;
if (priv->tentative_match || priv->in_hex_sequence)
{
priv->in_hex_sequence = FALSE;
priv->tentative_match = 0;
priv->tentative_match_len = 0;
g_signal_emit_by_name (context_simple, "preedit-changed");
g_signal_emit_by_name (context_simple, "preedit-end");
}
}
static void
gtk_im_context_simple_get_preedit_string (GtkIMContext *context,
gchar **str,
PangoAttrList **attrs,
gint *cursor_pos)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
char outbuf[37]; /* up to 6 hex digits */
int len = 0;
if (priv->in_hex_sequence)
{
int hexchars = 0;
outbuf[0] = 'u';
len = 1;
while (priv->compose_buffer[hexchars] != 0)
{
len += g_unichar_to_utf8 (gdk_keyval_to_unicode (priv->compose_buffer[hexchars]),
outbuf + len);
++hexchars;
}
g_assert (len < 25);
}
else if (priv->tentative_match)
len = g_unichar_to_utf8 (priv->tentative_match, outbuf);
outbuf[len] = '\0';
if (str)
*str = g_strdup (outbuf);
if (attrs)
{
*attrs = pango_attr_list_new ();
if (len)
{
PangoAttribute *attr = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
attr->start_index = 0;
attr->end_index = len;
pango_attr_list_insert (*attrs, attr);
}
}
if (cursor_pos)
*cursor_pos = len;
}
static void
gtk_im_context_simple_set_client_window (GtkIMContext *context,
GdkWindow *window)
{
GtkIMContextSimple *im_context_simple = GTK_IM_CONTEXT_SIMPLE (context);
gboolean run_compose_table = FALSE;
if (!window)
return;
/* Load compose table for X11 or Wayland. */
#ifdef GDK_WINDOWING_X11
if (GDK_IS_X11_DISPLAY (gdk_window_get_display (window)))
run_compose_table = TRUE;
#endif
#ifdef GDK_WINDOWING_WAYLAND
if (GDK_IS_WAYLAND_DISPLAY (gdk_window_get_display (window)))
run_compose_table = TRUE;
#endif
if (run_compose_table)
init_compose_table_async (im_context_simple, NULL, NULL, NULL);
}
/**
* gtk_im_context_simple_add_table: (skip)
* @context_simple: A #GtkIMContextSimple
* @data: (array): the table
* @max_seq_len: Maximum length of a sequence in the table
* (cannot be greater than #GTK_MAX_COMPOSE_LEN)
* @n_seqs: number of sequences in the table
*
* Adds an additional table to search to the input context.
* Each row of the table consists of @max_seq_len key symbols
* followed by two #guint16 interpreted as the high and low
* words of a #gunicode value. Tables are searched starting
* from the last added.
*
* The table must be sorted in dictionary order on the
* numeric value of the key symbol fields. (Values beyond
* the length of the sequence should be zero.)
**/
void
gtk_im_context_simple_add_table (GtkIMContextSimple *context_simple,
guint16 *data,
gint max_seq_len,
gint n_seqs)
{
g_return_if_fail (GTK_IS_IM_CONTEXT_SIMPLE (context_simple));
G_LOCK (global_tables);
global_tables = gtk_compose_table_list_add_array (global_tables,
data, max_seq_len, n_seqs);
G_UNLOCK (global_tables);
}
/*
* gtk_im_context_simple_add_compose_file:
* @context_simple: A #GtkIMContextSimple
* @compose_file: The path of compose file
*
* Adds an additional table from the X11 compose file.
*/
void
gtk_im_context_simple_add_compose_file (GtkIMContextSimple *context_simple,
const gchar *compose_file)
{
g_return_if_fail (GTK_IS_IM_CONTEXT_SIMPLE (context_simple));
G_LOCK (global_tables);
global_tables = gtk_compose_table_list_add_file (global_tables,
compose_file);
G_UNLOCK (global_tables);
}
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