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gtk2/gtk/gtkimcontextsimple.c
Matthias Clasen bbc36448fb imcontext: Treat keysyms as 32bit values 
Our compose table format is still limited to 16bit
values for keysyms, but what we see in key events
can be 32bit values, and we treat them as such now.

Fixes: #4149
2021-08-02 19:16:18 -04:00

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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>
#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 "gtkimmoduleprivate.h"
#include "gtkimcontextsimpleseqs.h"
#include "gdk/gdkprofilerprivate.h"
/**
* GtkIMContextSimple:
*
* `GtkIMContextSimple` is an input method supporting table-based input methods.
*
* ## Compose sequences
*
* `GtkIMContextSimple` reads compose sequences from the first of the
* following files that is found: ~/.config/gtk-4.0/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.
*
* If none of these files is found, `GtkIMContextSimple` uses a built-in table
* of compose sequences that is derived from the X11 Compose files.
*
* Note that compose sequences typically start with the Compose_key, which is
* often not available as a dedicated key on keyboards. Keyboard layouts may
* map this keysym to other keys, such as the right Control key.
*
* ## Unicode characters
*
* `GtkIMContextSimple` also supports numeric entry of Unicode characters
* by typing <kbd>Ctrl</kbd>-<kbd>Shift</kbd>-<kbd>u</kbd>, 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.
*
* ## Dead keys
*
* `GtkIMContextSimple` supports dead keys. For example, typing
*
* dead_acute a
*
* yields U+00E! LATIN SMALL LETTER_A WITH ACUTE, i.e. á. Note that this
* depends on the keyboard layout including dead keys.
*/
struct _GtkIMContextSimplePrivate
{
guint *compose_buffer;
int compose_buffer_len;
GString *tentative_match;
int tentative_match_len;
guint in_hex_sequence : 1;
guint in_compose_sequence : 1;
guint modifiers_dropped : 1;
};
#include "gtk/compose/gtkcomposedata.h"
GtkComposeTable builtin_compose_table = {
NULL,
NULL,
MAX_SEQ_LEN,
N_INDEX_SIZE,
DATA_SIZE,
N_CHARS,
0
};
static void
init_builtin_table (void)
{
GBytes *bytes;
bytes = g_resources_lookup_data ("/org/gtk/libgtk/compose/sequences", 0, NULL);
builtin_compose_table.data = (guint16 *) g_bytes_get_data (bytes, NULL);
g_bytes_unref (bytes);
bytes = g_resources_lookup_data ("/org/gtk/libgtk/compose/chars", 0, NULL);
builtin_compose_table.char_data = (char *) g_bytes_get_data (bytes, NULL);
g_bytes_unref (bytes);
}
G_LOCK_DEFINE_STATIC (global_tables);
static GSList *global_tables;
static const guint gtk_compose_ignore[] = {
0, /* Yes, XKB will send us key press events with NoSymbol :( */
GDK_KEY_Overlay1_Enable,
GDK_KEY_Overlay2_Enable,
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,
GDK_KEY_ISO_Level3_Latch,
GDK_KEY_ISO_Level5_Shift,
GDK_KEY_ISO_Level5_Latch
};
static void gtk_im_context_simple_finalize (GObject *obj);
static gboolean gtk_im_context_simple_filter_keypress (GtkIMContext *context,
GdkEvent *key);
static void gtk_im_context_simple_reset (GtkIMContext *context);
static void gtk_im_context_simple_get_preedit_string (GtkIMContext *context,
char **str,
PangoAttrList **attrs,
int *cursor_pos);
static void init_compose_table_async (GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
G_DEFINE_TYPE_WITH_CODE (GtkIMContextSimple, gtk_im_context_simple, GTK_TYPE_IM_CONTEXT,
G_ADD_PRIVATE (GtkIMContextSimple)
gtk_im_module_ensure_extension_point ();
g_io_extension_point_implement (GTK_IM_MODULE_EXTENSION_POINT_NAME,
g_define_type_id,
"gtk-im-context-simple",
G_MININT))
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;
gobject_class->finalize = gtk_im_context_simple_finalize;
init_builtin_table ();
init_compose_table_async (NULL, NULL, NULL);
}
static char *
get_x11_compose_file_dir (void)
{
char * compose_file_dir;
#if defined (X11_DATA_PREFIX)
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 int
gtk_compose_table_find (gconstpointer data1,
gconstpointer data2)
{
const GtkComposeTable *compose_table = (const GtkComposeTable *) data1;
guint32 hash = (guint32) GPOINTER_TO_INT (data2);
return compose_table->id != hash;
}
static gboolean
add_compose_table_from_file (const char *compose_file)
{
guint hash;
gboolean ret = FALSE;
G_LOCK (global_tables);
hash = g_str_hash (compose_file);
if (!g_slist_find_custom (global_tables, GINT_TO_POINTER (hash), gtk_compose_table_find))
{
GtkComposeTable *table;
table = gtk_compose_table_new_with_file (compose_file);
if (table)
{
ret = TRUE;
global_tables = g_slist_prepend (global_tables, table);
}
}
G_UNLOCK (global_tables);
return ret;
}
static void
add_builtin_compose_table (void)
{
G_LOCK (global_tables);
global_tables = g_slist_prepend (global_tables, &builtin_compose_table);
G_UNLOCK (global_tables);
}
static void
add_compose_table_from_data (guint16 *data,
int max_seq_len,
int n_seqs)
{
guint hash;
G_LOCK (global_tables);
hash = gtk_compose_table_data_hash (data, max_seq_len, n_seqs);
if (!g_slist_find_custom (global_tables, GINT_TO_POINTER (hash), gtk_compose_table_find))
{
GtkComposeTable *table;
table = gtk_compose_table_new_with_data (data, max_seq_len, n_seqs);
if (table)
global_tables = g_slist_prepend (global_tables, table);
}
G_UNLOCK (global_tables);
}
static void
gtk_im_context_simple_init_compose_table (void)
{
char *path = NULL;
const char *home;
const char *locale;
char **langs = NULL;
char **lang = NULL;
gboolean added;
const char * const sys_langs[] = { "el_gr", "fi_fi", "pt_br", NULL };
const char * const *sys_lang = NULL;
char *x11_compose_file_dir = get_x11_compose_file_dir ();
path = g_build_filename (g_get_user_config_dir (), "gtk-4.0", "Compose", NULL);
if (g_file_test (path, G_FILE_TEST_EXISTS))
{
added = add_compose_table_from_file (path);
g_free (path);
if (added)
return;
}
g_clear_pointer (&path, g_free);
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))
{
added = add_compose_table_from_file (path);
g_free (path);
if (added)
return;
}
g_clear_pointer (&path, g_free);
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_clear_pointer (&path, g_free);
}
g_free (x11_compose_file_dir);
g_strfreev (langs);
if (path != NULL)
{
added = add_compose_table_from_file (path);
g_free (path);
}
if (added)
return;
add_builtin_compose_table ();
}
static void
init_compose_table_thread_cb (GTask *task,
gpointer source_object,
gpointer task_data,
GCancellable *cancellable)
{
gint64 before G_GNUC_UNUSED;
before = GDK_PROFILER_CURRENT_TIME;
if (g_task_return_error_if_cancelled (task))
return;
gtk_im_context_simple_init_compose_table ();
gdk_profiler_end_mark (before, "im compose table load (thread)", NULL);
}
static void
init_compose_table_async (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_run_in_thread (task, init_compose_table_thread_cb);
g_object_unref (task);
}
static void
gtk_im_context_simple_init (GtkIMContextSimple *context_simple)
{
GtkIMContextSimplePrivate *priv;
priv = context_simple->priv = gtk_im_context_simple_get_instance_private (context_simple);
priv->compose_buffer_len = builtin_compose_table.max_seq_len + 1;
priv->compose_buffer = g_new0 (guint, priv->compose_buffer_len);
priv->tentative_match = g_string_new ("");
priv->tentative_match_len = 0;
}
static void
gtk_im_context_simple_finalize (GObject *obj)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (obj);
GtkIMContextSimplePrivate *priv = context_simple->priv;;
g_free (priv->compose_buffer);
g_string_free (priv->tentative_match, TRUE);
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_string (GtkIMContextSimple *context_simple,
const char *str)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
if (priv->in_hex_sequence ||
priv->tentative_match_len > 0 ||
priv->compose_buffer[0] != 0)
{
g_string_set_size (priv->tentative_match, 0);
priv->tentative_match_len = 0;
priv->in_hex_sequence = FALSE;
priv->in_compose_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");
}
g_signal_emit_by_name (context_simple, "commit", str);
}
static void
gtk_im_context_simple_commit_char (GtkIMContextSimple *context_simple,
gunichar ch)
{
char buf[8] = { 0, };
g_unichar_to_utf8 (ch, buf);
gtk_im_context_simple_commit_string (context_simple, buf);
}
/* 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,
int n_compose)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
/* See if this is a hex sequence, return TRUE if so */
int i;
GString *str;
gulong n;
char *nptr = NULL;
char buf[7];
g_string_set_size (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))
{
g_string_set_size (priv->tentative_match, 0);
g_string_append_unichar (priv->tentative_match, n);
priv->tentative_match_len = n_compose;
}
return TRUE;
}
static void
beep_surface (GdkSurface *surface)
{
GdkDisplay *display = gdk_surface_get_display (surface);
gboolean beep;
g_object_get (gtk_settings_get_for_display (display),
"gtk-error-bell", &beep,
NULL);
if (beep)
gdk_surface_beep (surface);
}
static inline gboolean
is_dead_key (guint keysym)
{
return GDK_KEY_dead_grave <= keysym && keysym <= GDK_KEY_dead_greek;
}
static void
append_dead_key (GString *string,
guint keysym)
{
/* Sadly, not all the dead keysyms have spacing mark equivalents
* in Unicode. For those that don't, we use NBSP + the non-spacing
* mark as an approximation.
*/
switch (keysym)
{
#define CASE(keysym, unicode, sp) \
case GDK_KEY_dead_##keysym: \
if (sp) \
g_string_append_unichar (string, 0xA0); \
g_string_append_unichar (string, unicode); \
break;
CASE (grave, 0x60, 0);
CASE (acute, 0xb4, 0);
CASE (circumflex, 0x5e, 0);
CASE (tilde, 0x7e, 0);
CASE (macron, 0xaf, 0);
CASE (breve, 0x2d8, 0);
CASE (abovedot, 0x307, 1);
CASE (diaeresis, 0xa8, 0);
CASE (abovering, 0x2da, 0);
CASE (hook, 0x2c0, 0);
CASE (doubleacute, 0x2dd, 0);
CASE (caron, 0x2c7, 0);
CASE (cedilla, 0xb8, 0);
CASE (ogonek, 0x2db, 0);
CASE (iota, 0x37a, 0);
CASE (voiced_sound, 0x3099, 1);
CASE (semivoiced_sound, 0x309a, 1);
CASE (belowdot, 0x323, 1);
CASE (horn, 0x31b, 1);
CASE (stroke, 0x335, 1);
CASE (abovecomma, 0x2bc, 0);
CASE (abovereversedcomma, 0x2bd, 1);
CASE (doublegrave, 0x30f, 1);
CASE (belowring, 0x2f3, 0);
CASE (belowmacron, 0x2cd, 0);
CASE (belowcircumflex, 0x32d, 1);
CASE (belowtilde, 0x330, 1);
CASE (belowbreve, 0x32e, 1);
CASE (belowdiaeresis, 0x324, 1);
CASE (invertedbreve, 0x32f, 1);
CASE (belowcomma, 0x326, 1);
CASE (lowline, 0x5f, 0);
CASE (aboveverticalline, 0x2c8, 0);
CASE (belowverticalline, 0x2cc, 0);
CASE (longsolidusoverlay, 0x338, 1);
CASE (a, 0x363, 1);
CASE (A, 0x363, 1);
CASE (e, 0x364, 1);
CASE (E, 0x364, 1);
CASE (i, 0x365, 1);
CASE (I, 0x365, 1);
CASE (o, 0x366, 1);
CASE (O, 0x366, 1);
CASE (u, 0x367, 1);
CASE (U, 0x367, 1);
CASE (small_schwa, 0x1dea, 1);
CASE (capital_schwa, 0x1dea, 1);
#undef CASE
default:
g_string_append_unichar (string, gdk_keyval_to_unicode (keysym));
}
}
static gboolean
no_sequence_matches (GtkIMContextSimple *context_simple,
int n_compose,
GdkEvent *event)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
GtkIMContext *context;
gunichar ch;
guint keyval;
context = GTK_IM_CONTEXT (context_simple);
priv->in_compose_sequence = FALSE;
/* No compose sequences found, check first if we have a partial
* match pending.
*/
if (priv->tentative_match_len > 0)
{
int len = priv->tentative_match_len;
int i;
guint *compose_buffer;
char *str;
compose_buffer = alloca (sizeof (guint) * priv->compose_buffer_len);
memcpy (compose_buffer, priv->compose_buffer, sizeof (guint) * priv->compose_buffer_len);
str = g_strdup (priv->tentative_match->str);
gtk_im_context_simple_commit_string (context_simple, str);
g_free (str);
for (i = 0; i < n_compose - len - 1; i++)
{
GdkTranslatedKey translated;
translated.keyval = compose_buffer[len + i];
translated.consumed = 0;
translated.layout = 0;
translated.level = 0;
GdkEvent *tmp_event = gdk_key_event_new (GDK_KEY_PRESS,
gdk_event_get_surface (event),
gdk_event_get_device (event),
gdk_event_get_time (event),
compose_buffer[len + i],
gdk_event_get_modifier_state (event),
FALSE,
&translated,
&translated);
gtk_im_context_filter_keypress (context, tmp_event);
gdk_event_unref (tmp_event);
}
return gtk_im_context_filter_keypress (context, event);
}
else
{
int i;
for (i = 0; i < n_compose && is_dead_key (priv->compose_buffer[i]); i++)
;
if (n_compose > 1 && i >= n_compose - 1)
{
GString *s;
s = g_string_new ("");
if (i == n_compose - 1)
{
/* dead keys are never *really* dead */
for (int j = 0; j < i; j++)
append_dead_key (s, priv->compose_buffer[j]);
ch = gdk_keyval_to_unicode (priv->compose_buffer[i]);
if (ch != 0 && ch != ' ' && !g_unichar_iscntrl (ch))
g_string_append_unichar (s, ch);
gtk_im_context_simple_commit_string (context_simple, s->str);
}
else
{
append_dead_key (s, priv->compose_buffer[0]);
gtk_im_context_simple_commit_string (context_simple, s->str);
for (i = 1; i < n_compose; i++)
priv->compose_buffer[i - 1] = priv->compose_buffer[i];
priv->compose_buffer[n_compose - 1] = 0;
priv->in_compose_sequence = TRUE;
g_signal_emit_by_name (context, "preedit-start");
g_signal_emit_by_name (context, "preedit-changed");
}
g_string_free (s, TRUE);
return TRUE;
}
priv->compose_buffer[0] = 0;
if (n_compose > 1) /* Invalid sequence */
{
beep_surface (gdk_event_get_surface (event));
g_signal_emit_by_name (context, "preedit-changed");
g_signal_emit_by_name (context, "preedit-end");
return TRUE;
}
keyval = gdk_key_event_get_keyval (event);
ch = gdk_keyval_to_unicode (keyval);
if (ch != 0 && !g_unichar_iscntrl (ch))
{
gtk_im_context_simple_commit_char (context_simple, ch);
return TRUE;
}
else
return FALSE;
}
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 (GdkEvent *event)
{
guint keyval, event_keyval;
guint *keyvals = NULL;
int n_vals = 0;
int i;
event_keyval = gdk_key_event_get_keyval (event);
/* 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_display_map_keycode (gdk_event_get_display (event),
gdk_key_event_get_keycode (event),
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,
GdkEvent *event)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
GdkSurface *surface = gdk_event_get_surface ((GdkEvent *) event);
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;
guint keyval, state;
while (priv->compose_buffer[n_compose] != 0 && n_compose < priv->compose_buffer_len)
n_compose++;
keyval = gdk_key_event_get_keyval (event);
state = gdk_event_get_modifier_state (event);
if (gdk_event_get_event_type (event) == GDK_KEY_RELEASE)
{
if (priv->in_hex_sequence &&
(keyval == GDK_KEY_Control_L || keyval == GDK_KEY_Control_R ||
keyval == GDK_KEY_Shift_L || keyval == GDK_KEY_Shift_R))
{
if (priv->tentative_match->len > 0)
{
char *str = g_strdup (priv->tentative_match->str);
gtk_im_context_simple_commit_string (context_simple, str);
g_free (str);
return TRUE;
}
else if (n_compose == 0)
{
priv->modifiers_dropped = TRUE;
return TRUE;
}
else if (priv->in_hex_sequence)
{
/* invalid hex sequence */
beep_surface (surface);
g_string_set_size (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;
}
}
if (priv->in_hex_sequence || priv->in_compose_sequence)
return TRUE; /* Don't leak random key events during preedit */
return FALSE;
}
/* Ignore modifier key presses */
for (i = 0; i < G_N_ELEMENTS (gtk_compose_ignore); i++)
if (keyval == gtk_compose_ignore[i])
{
if (priv->in_hex_sequence || priv->in_compose_sequence)
return TRUE; /* Don't leak random key events during preedit */
return FALSE;
}
hex_mod_mask = GDK_CONTROL_MASK|GDK_SHIFT_MASK;
if (priv->in_hex_sequence && priv->modifiers_dropped)
have_hex_mods = TRUE;
else
have_hex_mods = (state & (hex_mod_mask)) == hex_mod_mask;
is_hex_start = keyval == GDK_KEY_U;
is_hex_end = (keyval == GDK_KEY_space ||
keyval == GDK_KEY_KP_Space ||
keyval == GDK_KEY_Return ||
keyval == GDK_KEY_ISO_Enter ||
keyval == GDK_KEY_KP_Enter);
is_backspace = keyval == GDK_KEY_BackSpace;
is_escape = 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_ALT_MASK|GDK_CONTROL_MASK;
if (priv->in_hex_sequence && priv->modifiers_dropped &&
(keyval == GDK_KEY_Return ||
keyval == GDK_KEY_ISO_Enter ||
keyval == GDK_KEY_KP_Enter))
{
return FALSE;
}
if (state & no_text_input_mask)
{
if (priv->in_hex_sequence || priv->in_compose_sequence)
return TRUE; /* Don't leak random key events during preedit */
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;
}
if (!priv->in_hex_sequence && n_compose > 0 && is_backspace)
{
n_compose--;
priv->compose_buffer[n_compose] = 0;
g_signal_emit_by_name (context_simple, "preedit-changed");
if (n_compose == 0)
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->len > 0)
{
char *str = g_strdup (priv->tentative_match->str);
gtk_im_context_simple_commit_string (context_simple, str);
g_free (str);
}
else
{
/* invalid hex sequence */
if (n_compose > 0)
beep_surface (surface);
g_string_set_size (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;
g_string_set_size (priv->tentative_match, 0);
g_signal_emit_by_name (context_simple, "preedit-start");
g_signal_emit_by_name (context_simple, "preedit-changed");
return TRUE;
}
if (is_escape)
{
if (priv->in_hex_sequence || priv->in_compose_sequence)
{
gtk_im_context_simple_reset (context);
return TRUE;
}
return FALSE;
}
if (priv->in_hex_sequence)
{
if (hex_keyval && n_compose < 6)
priv->compose_buffer[n_compose++] = hex_keyval;
else if (!is_hex_end)
{
/* non-hex character in hex sequence, or sequence too long */
beep_surface (surface);
return TRUE;
}
}
else
{
if (n_compose + 1 == priv->compose_buffer_len)
{
priv->compose_buffer_len += 1;
priv->compose_buffer = g_renew (guint, priv->compose_buffer, priv->compose_buffer_len);
}
priv->compose_buffer[n_compose++] = 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->len > 0)
{
char *str = g_strdup (priv->tentative_match->str);
gtk_im_context_simple_commit_string (context_simple, str);
g_free (str);
return TRUE;
}
else
{
/* invalid hex sequence */
beep_surface (surface);
g_string_set_size (priv->tentative_match, 0);
priv->in_hex_sequence = FALSE;
priv->compose_buffer[0] = 0;
}
}
else if (!check_hex (context_simple, n_compose))
beep_surface (surface);
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 /* Then, check for compose sequences */
{
gboolean success = FALSE;
int prefix = 0;
GString *output;
output = g_string_new ("");
G_LOCK (global_tables);
tmp_list = global_tables;
while (tmp_list)
{
if (gtk_compose_table_check ((GtkComposeTable *)tmp_list->data,
priv->compose_buffer, n_compose,
&compose_finish, &compose_match,
output))
{
if (!priv->in_compose_sequence)
{
priv->in_compose_sequence = TRUE;
g_signal_emit_by_name (context_simple, "preedit-start");
}
if (compose_finish)
{
if (compose_match)
gtk_im_context_simple_commit_string (context_simple, output->str);
}
else
{
if (compose_match)
{
g_string_assign (priv->tentative_match, output->str);
priv->tentative_match_len = n_compose;
}
g_signal_emit_by_name (context_simple, "preedit-changed");
}
success = TRUE;
break;
}
else
{
int table_prefix;
gtk_compose_table_get_prefix ((GtkComposeTable *)tmp_list->data,
priv->compose_buffer, n_compose,
&table_prefix);
prefix = MAX (prefix, table_prefix);
}
tmp_list = tmp_list->next;
}
G_UNLOCK (global_tables);
if (success)
{
g_string_free (output, TRUE);
return TRUE;
}
if (gtk_check_algorithmically (priv->compose_buffer, n_compose, output))
{
if (!priv->in_compose_sequence)
{
priv->in_compose_sequence = TRUE;
g_signal_emit_by_name (context_simple, "preedit-start");
}
if (output->len > 0)
gtk_im_context_simple_commit_string (context_simple, output->str);
else
g_signal_emit_by_name (context_simple, "preedit-changed");
g_string_free (output, TRUE);
return TRUE;
}
g_string_free (output, TRUE);
/* If we get here, no Compose sequence matched.
* Only beep if we were in a sequence before.
*/
if (prefix > 0)
{
for (i = prefix; i < n_compose; i++)
priv->compose_buffer[i] = 0;
beep_surface (gdk_event_get_surface (event));
g_signal_emit_by_name (context_simple, "preedit-changed");
return TRUE;
}
}
/* The current compose_buffer doesn't match anything */
return no_sequence_matches (context_simple, n_compose, (GdkEvent *)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->len > 0 ||
priv->in_hex_sequence ||
priv->in_compose_sequence)
{
priv->in_hex_sequence = FALSE;
priv->in_compose_sequence = FALSE;
g_string_set_size (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,
char **str,
PangoAttrList **attrs,
int *cursor_pos)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
GString *s;
int i;
s = g_string_new ("");
if (priv->in_hex_sequence)
{
g_string_append_c (s, 'u');
for (i = 0; priv->compose_buffer[i]; i++)
g_string_append_unichar (s, gdk_keyval_to_unicode (priv->compose_buffer[i]));
}
else if (priv->in_compose_sequence)
{
if (priv->tentative_match_len > 0 && priv->compose_buffer[0] != 0)
{
g_string_append (s, priv->tentative_match->str);
}
else
{
for (i = 0; priv->compose_buffer[i]; i++)
{
if (priv->compose_buffer[i] == GDK_KEY_Multi_key)
{
/* We only show the Compose key visibly when it is the
* only glyph in the preedit, or when the sequence contains
* multiple Compose keys, or when it occurs in the
* middle of the sequence. Sadly, the official character,
* U+2384, COMPOSITION SYMBOL, is bit too distracting, so
* we use U+00B7, MIDDLE DOT.
*/
if (priv->compose_buffer[1] == 0 || i > 0 ||
priv->compose_buffer[i + 1] == GDK_KEY_Multi_key)
g_string_append (s, "·");
}
else
{
gunichar ch;
if (is_dead_key (priv->compose_buffer[i]))
{
append_dead_key (s, priv->compose_buffer[i]);
}
else
{
ch = gdk_keyval_to_unicode (priv->compose_buffer[i]);
if (ch)
g_string_append_unichar (s, ch);
}
}
}
}
}
if (cursor_pos)
*cursor_pos = g_utf8_strlen (s->str, s->len);
if (attrs)
{
*attrs = pango_attr_list_new ();
if (s->len)
{
PangoAttribute *attr;
attr = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
attr->start_index = 0;
attr->end_index = s->len;
pango_attr_list_insert (*attrs, attr);
attr = pango_attr_fallback_new (TRUE);
attr->start_index = 0;
attr->end_index = s->len;
pango_attr_list_insert (*attrs, attr);
}
}
if (str)
*str = g_string_free (s, FALSE);
}
/**
* 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
* @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.)
*
* Deprecated: 4.4: Use gtk_im_context_simple_add_compose_file()
*/
void
gtk_im_context_simple_add_table (GtkIMContextSimple *context_simple,
guint16 *data,
int max_seq_len,
int n_seqs)
{
g_return_if_fail (GTK_IS_IM_CONTEXT_SIMPLE (context_simple));
add_compose_table_from_data (data, max_seq_len, n_seqs);
}
/**
* 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 char *compose_file)
{
g_return_if_fail (GTK_IS_IM_CONTEXT_SIMPLE (context_simple));
add_compose_table_from_file (compose_file);
}
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