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gtk2/gtk/gtkimcontextsimple.c
Matthias Clasen 3c70a12785 GtkImContextSimple: fix tentative match handling 
When switching to the compact table format, we inadvertedly lost
the 'tentative match' handling which allows to complete longer
compose sequences even if a prefix is a complete sequence.
This was pointed out in bug 666710.
2011-12-29 23:42:03 -05:00

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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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.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"
/**
* SECTION:gtkimcontextsimple
* @Short_description: An input method context supporting table-based input methods
* @Title: GtkIMContextSimple
*/
typedef struct _GtkComposeTable GtkComposeTable;
typedef struct _GtkComposeTableCompact GtkComposeTableCompact;
struct _GtkIMContextSimplePrivate
{
GSList *tables;
guint compose_buffer[GTK_MAX_COMPOSE_LEN + 1];
gunichar tentative_match;
gint tentative_match_len;
guint in_hex_sequence : 1;
guint modifiers_dropped : 1;
};
struct _GtkComposeTable
{
const guint16 *data;
gint max_seq_len;
gint n_seqs;
};
struct _GtkComposeTableCompact
{
const guint16 *data;
gint max_seq_len;
gint n_index_size;
gint n_index_stride;
};
/* This file contains the table of the compose sequences,
* static const guint16 gtk_compose_seqs_compact[] = {}
* It is generated from the compose-parse.py script.
*/
#include "gtkimcontextsimpleseqs.h"
/* From the values below, the value 24 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).
*/
static const GtkComposeTableCompact gtk_compose_table_compact = {
gtk_compose_seqs_compact,
5,
24,
6
};
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);
G_DEFINE_TYPE (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;
gobject_class->finalize = gtk_im_context_simple_finalize;
g_type_class_add_private (class, sizeof (GtkIMContextSimplePrivate));
}
static void
gtk_im_context_simple_init (GtkIMContextSimple *im_context_simple)
{
im_context_simple->priv = G_TYPE_INSTANCE_GET_PRIVATE (im_context_simple,
GTK_TYPE_IM_CONTEXT_SIMPLE,
GtkIMContextSimplePrivate);
}
static void
gtk_im_context_simple_finalize (GObject *obj)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (obj);
GtkIMContextSimplePrivate *priv = context_simple->priv;
if (priv->tables)
{
g_slist_foreach (priv->tables, (GFunc)g_free, NULL);
g_slist_free (priv->tables);
priv->tables = NULL;
}
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 guint *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 guint *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;
GTK_NOTE (MISC, g_print ("win32: U+%04X\n", value));
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);
GTK_NOTE (MISC, g_print ("win32: U+%04X ", value));
}
}
#endif
static gboolean
check_compact_table (GtkIMContextSimple *context_simple,
const GtkComposeTableCompact *table,
gint n_compose)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
gint row_stride;
guint16 *seq_index;
guint16 *seq;
gint i;
gboolean match;
gunichar value;
/* 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 (priv->compose_buffer,
table->data,
table->n_index_size,
sizeof (guint16) * table->n_index_stride,
compare_seq_index);
if (!seq_index)
{
GTK_NOTE (MISC, g_print ("compact: no\n"));
return FALSE;
}
if (seq_index && n_compose == 1)
{
GTK_NOTE (MISC, g_print ("compact: yes\n"));
return TRUE;
}
GTK_NOTE (MISC, g_print ("compact: %d ", *seq_index));
seq = NULL;
match = FALSE;
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 (priv->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 (match)
{
GTK_NOTE (MISC, g_print ("tentative match U+%04X ", value));
priv->tentative_match = value;
priv->tentative_match_len = n_compose;
}
g_signal_emit_by_name (context_simple, "preedit-changed");
GTK_NOTE (MISC, g_print ("yes\n"));
return TRUE;
}
}
}
}
if (match)
{
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple), value);
#ifdef G_OS_WIN32
check_win32_special_case_after_compact_match (context_simple, n_compose, value);
#endif
priv->compose_buffer[0] = 0;
GTK_NOTE (MISC, g_print ("U+%04X\n", value));
return TRUE;
}
GTK_NOTE (MISC, g_print ("no\n"));
return FALSE;
}
/* This function receives a sequence of Unicode characters and tries to
* normalize it (NFC). We check for the case the 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;
}
static gboolean
check_algorithmically (GtkIMContextSimple *context_simple,
gint n_compose)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
gint i;
gunichar combination_buffer[GTK_MAX_COMPOSE_LEN];
gchar *combination_utf8, *nfc;
if (n_compose >= GTK_MAX_COMPOSE_LEN)
return FALSE;
for (i = 0; i < n_compose && IS_DEAD_KEY (priv->compose_buffer[i]); i++)
;
if (i == n_compose)
return TRUE;
if (i > 0 && i == n_compose - 1)
{
combination_buffer[0] = gdk_keyval_to_unicode (priv->compose_buffer[i]);
combination_buffer[n_compose] = 0;
i--;
while (i >= 0)
{
switch (priv->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 (priv->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))
{
gunichar value;
combination_utf8 = g_ucs4_to_utf8 (combination_buffer, -1, NULL, NULL, NULL);
nfc = g_utf8_normalize (combination_utf8, -1, G_NORMALIZE_NFC);
value = g_utf8_get_char (nfc);
gtk_im_context_simple_commit_char (GTK_IM_CONTEXT (context_simple), value);
priv->compose_buffer[0] = 0;
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;
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))
{
g_print ("committing tentative match on release\n");
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))
{
GdkDisplay *display;
GdkModifierType no_text_input_mask;
display = gdk_window_get_display (event->window);
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
{
tmp_list = priv->tables;
while (tmp_list)
{
if (check_table (context_simple, tmp_list->data, n_compose))
return TRUE;
tmp_list = tmp_list->next;
}
GTK_NOTE (MISC, {
g_print ("[ ");
for (i = 0; i < n_compose; i++)
{
const gchar *keyval_name = gdk_keyval_name (priv->compose_buffer[i]);
if (keyval_name != NULL)
g_print ("%s ", keyval_name);
else
g_print ("%04x ", priv->compose_buffer[i]);
}
g_print ("] ");
});
#ifdef GDK_WINDOWING_WIN32
if (check_win32_special_cases (context_simple, n_compose))
return TRUE;
#endif
if (check_compact_table (context_simple, &gtk_compose_table_compact, n_compose))
return TRUE;
if (check_algorithmically (context_simple, n_compose))
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;
}
/**
* gtk_im_context_simple_add_table: (skip)
* @context_simple: A #GtkIMContextSimple
* @data: 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)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
GtkComposeTable *table;
g_return_if_fail (GTK_IS_IM_CONTEXT_SIMPLE (context_simple));
g_return_if_fail (data != NULL);
g_return_if_fail (max_seq_len <= GTK_MAX_COMPOSE_LEN);
table = g_new (GtkComposeTable, 1);
table->data = data;
table->max_seq_len = max_seq_len;
table->n_seqs = n_seqs;
priv->tables = g_slist_prepend (priv->tables, table);
}
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