rxvt-unicode/src/keyboard.C

#include "../config.h"
#include "rxvt.h"

#ifdef KEYSYM_RESOURCE

#include <cstring>

#include "keyboard.h"
#include "command.h"

#if STOCK_KEYMAP
////////////////////////////////////////////////////////////////////////////////
// default keycode translation map and keyevent handlers

keysym_t keyboard_manager::stock_keymap[] = {
  /* examples */
  /*        keysym,                state, range,               handler,              str */
//{XK_ISO_Left_Tab,                    0,     1,      keysym_t::NORMAL,           "\033[Z"},
//{            'a',                    0,    26, keysym_t::RANGE_META8,           "a" "%c"},
//{            'a',          ControlMask,    26, keysym_t::RANGE_META8,          "" "%c"},
//{        XK_Left,                    0,     4,        keysym_t::LIST,     ".\033[.DACB."},
//{        XK_Left,            ShiftMask,     4,        keysym_t::LIST,     ".\033[.dacb."},
//{        XK_Left,          ControlMask,     4,        keysym_t::LIST,     ".\033O.dacb."},
//{         XK_Tab,          ControlMask,     1,      keysym_t::NORMAL,      "\033<C-Tab>"},
//{  XK_apostrophe,          ControlMask,     1,      keysym_t::NORMAL,        "\033<C-'>"},
//{       XK_slash,          ControlMask,     1,      keysym_t::NORMAL,        "\033<C-/>"},
//{   XK_semicolon,          ControlMask,     1,      keysym_t::NORMAL,        "\033<C-;>"},
//{       XK_grave,          ControlMask,     1,      keysym_t::NORMAL,        "\033<C-`>"},
//{       XK_comma,          ControlMask,     1,      keysym_t::NORMAL,     "\033<C-\054>"},
//{      XK_Return,          ControlMask,     1,      keysym_t::NORMAL,   "\033<C-Return>"},
//{      XK_Return,            ShiftMask,     1,      keysym_t::NORMAL,   "\033<S-Return>"},
//{            ' ',            ShiftMask,     1,      keysym_t::NORMAL,    "\033<S-Space>"},
//{            '.',          ControlMask,     1,      keysym_t::NORMAL,        "\033<C-.>"},
//{            '0',          ControlMask,    10,       keysym_t::RANGE,   "0" "\033<C-%c>"},
//{            '0', MetaMask|ControlMask,    10,       keysym_t::RANGE, "0" "\033<M-C-%c>"},
//{            'a', MetaMask|ControlMask,    26,       keysym_t::RANGE, "a" "\033<M-C-%c>"},
};
#endif

static void
output_string (rxvt_term *rt, const char *str)
{
  if (strncmp (str, "command:", 8) == 0)
    rt->cmd_write ((unsigned char *)str + 8, strlen (str) - 8);
  else
    rt->tt_write ((unsigned char *)str, strlen (str));
}

static void
output_string_meta8 (rxvt_term *rt, unsigned int state, char *buf, int buflen)
{
  if (state & rt->ModMetaMask)
    {
#ifdef META8_OPTION
      if (rt->meta_char == 0x80)        /* set 8-bit on */
        {
          for (char *ch = buf; ch < buf + buflen; ch++)
            *ch |= 0x80;
        }
      else if (rt->meta_char == C0_ESC) /* escape prefix */
#endif
        {
          const unsigned char ch = C0_ESC;
          rt->tt_write (&ch, 1);
        }
    }

  rt->tt_write ((unsigned char *) buf, buflen);
}

static int
format_keyrange_string (const char *str, int keysym_offset, char *buf, int bufsize)
{
  size_t len = snprintf (buf, bufsize, str + 1, keysym_offset + str [0]);

  if (len >= (size_t)bufsize)
    {
      rxvt_warn ("format_keyrange_string: formatting failed, ignoring key.\n");
      *buf = 0;
    }

  return len;
}

////////////////////////////////////////////////////////////////////////////////
// return: #bits of '1'
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 3)
# define bitcount(n) (__extension__ ({ uint32_t n__ = (n); __builtin_popcount (n); }))
#else
static int
bitcount (uint16_t n)
{
  int i;

  for (i = 0; n; ++i, n &= n - 1)
    ;

  return i;
}
#endif

// return: priority_of_a - priority_of_b
static int
compare_priority (keysym_t *a, keysym_t *b)
{
  // (the more '1's in state; the less range): the greater priority
  int ca = bitcount (a->state /* & OtherModMask */);
  int cb = bitcount (b->state /* & OtherModMask */);

  if (ca != cb)
    return ca - cb;
//else if (a->state != b->state) // this behavior is to be disscussed
//  return b->state - a->state;
  else
    return b->range - a->range;
}

////////////////////////////////////////////////////////////////////////////////
keyboard_manager::keyboard_manager ()
{
  keymap.reserve (256);
  hash [0] = 1;                 // hash[0] != 0 indicates uninitialized data
}

keyboard_manager::~keyboard_manager ()
{
  clear ();
}

void
keyboard_manager::clear ()
{
  keymap.clear ();
  hash [0] = 2;

  for (unsigned int i = 0; i < user_translations.size (); ++i)
    {
      free ((void *)user_translations [i]);
      user_translations [i] = 0;
    }

  for (unsigned int i = 0; i < user_keymap.size (); ++i)
    {
      delete user_keymap [i];
      user_keymap [i] = 0;
    }

  user_keymap.clear ();
  user_translations.clear ();
}

// a wrapper for register_keymap,
// so that outside codes don't have to know so much details.
//
// the string 'trans' is copied to an internal managed buffer,
// so the caller can free memory of 'trans' at any time.
void
keyboard_manager::register_user_translation (KeySym keysym, unsigned int state, const char *trans)
{
  keysym_t *key = new keysym_t;
  wchar_t *wc = rxvt_mbstowcs (trans);
  const char *translation = rxvt_wcstoutf8 (wc);
  free (wc);

  if (key && translation)
    {
      key->keysym = keysym;
      key->state  = state;
      key->range  = 1;
      key->str    = translation;
      key->type   = keysym_t::NORMAL;

      if (strncmp (translation, "list", 4) == 0 && translation [4])
        {
          char *middle = strchr  (translation + 5, translation [4]);
          char *suffix = strrchr (translation + 5, translation [4]);
          
          if (suffix && middle && suffix > middle + 1)
            {
              key->type  = keysym_t::LIST;
              key->range = suffix - middle - 1;

              strcpy (translation, translation + 4);
            }
          else
            rxvt_warn ("cannot parse list-type keysym '%s', treating as normal keysym.\n", translation);
        }

      user_keymap.push_back (key);
      user_translations.push_back (translation);
      register_keymap (key);
    }
  else
    {
      delete key;
      free ((void *)translation);
      rxvt_fatal ("out of memory, aborting.\n");
    }
}

void
keyboard_manager::register_keymap (keysym_t *key)
{
  if (keymap.size () == keymap.capacity ())
    keymap.reserve (keymap.size () * 2);

  keymap.push_back (key);
  hash[0] = 3;
}

void
keyboard_manager::register_done ()
{
#if STOCK_KEYMAP
  int n = sizeof (stock_keymap) / sizeof (keysym_t);

  //TODO: shield against repeated calls and empty keymap
  //if (keymap.back () != &stock_keymap[n - 1])
    for (int i = 0; i < n; ++i)
      register_keymap (&stock_keymap[i]);
#endif

  purge_duplicate_keymap ();

  setup_hash ();
}

bool
keyboard_manager::dispatch (rxvt_term *term, KeySym keysym, unsigned int state)
{
  assert (hash[0] == 0 && "register_done() need to be called");

  if (state & term->ModMetaMask)    state |= MetaMask;
  if (state & term->ModNumLockMask) state |= NumLockMask;
  if (state & term->ModLevel3Mask)  state |= Level3Mask;

  if (!!(term->priv_modes & PrivMode_aplKP) != !!(state & ShiftMask))
    state |= AppKeypadMask;

  int index = find_keysym (keysym, state);

  if (index >= 0)
    {
      const keysym_t &key = *keymap [index];

      int keysym_offset = keysym - key.keysym;

      wchar_t *wc = rxvt_utf8towcs (key.str);
      char *str = rxvt_wcstombs (wc);
      // TODO: do (some) translations, unescaping etc, here (allow \u escape etc.)
      free (wc);

      switch (key.type)
        {
         case keysym_t::NORMAL:
            output_string (term, str);
            break;

          case keysym_t::RANGE:
            {
              char buf[STRING_MAX];

              if (format_keyrange_string (str, keysym_offset, buf, sizeof (buf)) > 0)
                output_string (term, buf);
            }
            break;

          case keysym_t::RANGE_META8:
            {
              int len;
              char buf[STRING_MAX];

              len = format_keyrange_string (str, keysym_offset, buf, sizeof (buf));
              if (len > 0)
                output_string_meta8 (term, state, buf, len);
            }
            break;

          case keysym_t::LIST:
            {
              char buf[STRING_MAX];

              char *prefix, *middle, *suffix;

              prefix = str;
              middle = strchr  (prefix + 1, *prefix);
              suffix = strrchr (middle + 1, *prefix);

              memcpy (buf, prefix + 1, middle - prefix - 1);
              buf [middle - prefix - 1] = middle [keysym_offset + 1];
              strcpy (buf + (middle - prefix), suffix + 1);

              output_string (term, buf);
            }
            break;
        }

      free (str);

      return true;
    }
  else
    return false;
}

// purge duplicate keymap entries
void keyboard_manager::purge_duplicate_keymap ()
{
  for (unsigned int i = 0; i < keymap.size (); ++i)
    {
      for (unsigned int j = 0; j < i; ++j)
        {
          if (keymap [i] == keymap [j])
            {
              while (keymap [i] == keymap.back ())
                keymap.pop_back ();

              if (i < keymap.size ())
                {
                  keymap[i] = keymap.back ();
                  keymap.pop_back ();
                }

              break;
            }
        }
    }
}

void
keyboard_manager::setup_hash ()
{
  unsigned int i, index, hashkey;
  vector <keysym_t *> sorted_keymap;
  uint16_t hash_budget_size[KEYSYM_HASH_BUDGETS];       // size of each budget
  uint16_t hash_budget_counter[KEYSYM_HASH_BUDGETS];    // #elements in each budget

  memset (hash_budget_size, 0, sizeof (hash_budget_size));
  memset (hash_budget_counter, 0, sizeof (hash_budget_counter));

  // determine hash bucket size
  for (i = 0; i < keymap.size (); ++i)
    for (int j = min (keymap [i]->range, KEYSYM_HASH_BUDGETS) - 1; j >= 0; --j)
      {
        hashkey = (keymap [i]->keysym + j) & KEYSYM_HASH_MASK;
        ++hash_budget_size [hashkey];
      }

  // now we know the size of each budget
  // compute the index of each budget
  hash [0] = 0;
  for (index = 0, i = 1; i < KEYSYM_HASH_BUDGETS; ++i)
    {
      index += hash_budget_size [i - 1];
      hash [i] = index;
    }

  // and allocate just enough space
  sorted_keymap.insert (sorted_keymap.begin (), index + hash_budget_size [i - 1], 0);

  // fill in sorted_keymap
  // it is sorted in each budget
  for (i = 0; i < keymap.size (); ++i)
    for (int j = min (keymap [i]->range, KEYSYM_HASH_BUDGETS) - 1; j >= 0; --j)
      {
        hashkey = (keymap [i]->keysym + j) & KEYSYM_HASH_MASK;

        index = hash [hashkey] + hash_budget_counter [hashkey];

        while (index > hash [hashkey]
               && compare_priority (keymap [i], sorted_keymap [index - 1]) > 0)
          {
            sorted_keymap [index] = sorted_keymap [index - 1];
            --index;
          }

        sorted_keymap [index] = keymap [i];
        ++hash_budget_counter [hashkey];
      }

  keymap.swap (sorted_keymap);

#if defined (DEBUG_STRICT) || defined (DEBUG_KEYBOARD)
  // check for invariants
  for (i = 0; i < KEYSYM_HASH_BUDGETS; ++i)
    {
      index = hash[i];
      for (int j = 0; j < hash_budget_size [i]; ++j)
        {
          if (keymap [index + j]->range == 1)
            assert (i == (keymap [index + j]->keysym & KEYSYM_HASH_MASK));

          if (j)
            assert (compare_priority (keymap [index + j - 1],
                    keymap [index + j]) >= 0);
        }
    }

  // this should be able to detect most possible bugs
  for (i = 0; i < sorted_keymap.size (); ++i)
    {
      keysym_t *a = sorted_keymap[i];
      for (int j = 0; j < a->range; ++j)
        {
          int index = find_keysym (a->keysym + j, a->state);

          assert (index >= 0);
          keysym_t *b = keymap [index];
          assert (i == (signed) index ||        // the normally expected result
            (a->keysym + j) >= b->keysym && (a->keysym + j) <= (b->keysym + b->range) && compare_priority (a, b) <= 0); // is effectively the same or a closer match
        }
    }
#endif
}

int
keyboard_manager::find_keysym (KeySym keysym, unsigned int state)
{
  int hashkey = keysym & KEYSYM_HASH_MASK;
  unsigned int index = hash [hashkey];
  unsigned int end = hashkey < KEYSYM_HASH_BUDGETS - 1
                     ? hash [hashkey + 1] 
                     : keymap.size ();

  for (; index < end; ++index)
    {
      keysym_t *key = keymap [index];

      if (key->keysym <= keysym && keysym < key->keysym + key->range
          // match only the specified bits in state and ignore others
          && (key->state & state) == key->state)
        return index;
    }

  return -1;
}

#endif /* KEYSYM_RESOURCE */
// vim:et:ts=2:sw=2
Revision:	1.12
Committed:	Sat Feb 12 18:55:04 2005 UTC (19 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-5_1, rel-5_2
Changes since 1.11:	+8 -3 lines
Log Message:	* empty log message *
#	Content
1	#include "../config.h"
2	#include "rxvt.h"
3
4	#ifdef KEYSYM_RESOURCE
5
6	#include <cstring>
7
8	#include "keyboard.h"
9	#include "command.h"
10
11	#if STOCK_KEYMAP
12	////////////////////////////////////////////////////////////////////////////////
13	// default keycode translation map and keyevent handlers
14
15	keysym_t keyboard_manager::stock_keymap[] = {
16	/* examples */
17	/* keysym, state, range, handler, str */
18	//{XK_ISO_Left_Tab, 0, 1, keysym_t::NORMAL, "\033[Z"},
19	//{ 'a', 0, 26, keysym_t::RANGE_META8, "a" "%c"},
20	//{ 'a', ControlMask, 26, keysym_t::RANGE_META8, "" "%c"},
21	//{ XK_Left, 0, 4, keysym_t::LIST, ".\033[.DACB."},
22	//{ XK_Left, ShiftMask, 4, keysym_t::LIST, ".\033[.dacb."},
23	//{ XK_Left, ControlMask, 4, keysym_t::LIST, ".\033O.dacb."},
24	//{ XK_Tab, ControlMask, 1, keysym_t::NORMAL, "\033<C-Tab>"},
25	//{ XK_apostrophe, ControlMask, 1, keysym_t::NORMAL, "\033<C-'>"},
26	//{ XK_slash, ControlMask, 1, keysym_t::NORMAL, "\033<C-/>"},
27	//{ XK_semicolon, ControlMask, 1, keysym_t::NORMAL, "\033<C-;>"},
28	//{ XK_grave, ControlMask, 1, keysym_t::NORMAL, "\033<C-`>"},
29	//{ XK_comma, ControlMask, 1, keysym_t::NORMAL, "\033<C-\054>"},
30	//{ XK_Return, ControlMask, 1, keysym_t::NORMAL, "\033<C-Return>"},
31	//{ XK_Return, ShiftMask, 1, keysym_t::NORMAL, "\033<S-Return>"},
32	//{ ' ', ShiftMask, 1, keysym_t::NORMAL, "\033<S-Space>"},
33	//{ '.', ControlMask, 1, keysym_t::NORMAL, "\033<C-.>"},
34	//{ '0', ControlMask, 10, keysym_t::RANGE, "0" "\033<C-%c>"},
35	//{ '0', MetaMask\|ControlMask, 10, keysym_t::RANGE, "0" "\033<M-C-%c>"},
36	//{ 'a', MetaMask\|ControlMask, 26, keysym_t::RANGE, "a" "\033<M-C-%c>"},
37	};
38	#endif
39
40	static void
41	output_string (rxvt_term rt, const char str)
42	{
43	if (strncmp (str, "command:", 8) == 0)
44	rt->cmd_write ((unsigned char *)str + 8, strlen (str) - 8);
45	else
46	rt->tt_write ((unsigned char *)str, strlen (str));
47	}
48
49	static void
50	output_string_meta8 (rxvt_term rt, unsigned int state, char buf, int buflen)
51	{
52	if (state & rt->ModMetaMask)
53	{
54	#ifdef META8_OPTION
55	if (rt->meta_char == 0x80) /* set 8-bit on */
56	{
57	for (char *ch = buf; ch < buf + buflen; ch++)
58	*ch \|= 0x80;
59	}
60	else if (rt->meta_char == C0_ESC) /* escape prefix */
61	#endif
62	{
63	const unsigned char ch = C0_ESC;
64	rt->tt_write (&ch, 1);
65	}
66	}
67
68	rt->tt_write ((unsigned char *) buf, buflen);
69	}
70
71	static int
72	format_keyrange_string (const char str, int keysym_offset, char buf, int bufsize)
73	{
74	size_t len = snprintf (buf, bufsize, str + 1, keysym_offset + str [0]);
75
76	if (len >= (size_t)bufsize)
77	{
78	rxvt_warn ("format_keyrange_string: formatting failed, ignoring key.\n");
79	*buf = 0;
80	}
81
82	return len;
83	}
84
85	////////////////////////////////////////////////////////////////////////////////
86	// return: #bits of '1'
87	#if __GNUC__ > 3 \|\| (__GNUC__ == 3 && __GNUC_MINOR__ > 3)
88	# define bitcount(n) (__extension__ ({ uint32_t n__ = (n); __builtin_popcount (n); }))
89	#else
90	static int
91	bitcount (uint16_t n)
92	{
93	int i;
94
95	for (i = 0; n; ++i, n &= n - 1)
96	;
97
98	return i;
99	}
100	#endif
101
102	// return: priority_of_a - priority_of_b
103	static int
104	compare_priority (keysym_t a, keysym_t b)
105	{
106	// (the more '1's in state; the less range): the greater priority
107	int ca = bitcount (a->state /* & OtherModMask */);
108	int cb = bitcount (b->state /* & OtherModMask */);
109
110	if (ca != cb)
111	return ca - cb;
112	//else if (a->state != b->state) // this behavior is to be disscussed
113	// return b->state - a->state;
114	else
115	return b->range - a->range;
116	}
117
118	////////////////////////////////////////////////////////////////////////////////
119	keyboard_manager::keyboard_manager ()
120	{
121	keymap.reserve (256);
122	hash [0] = 1; // hash[0] != 0 indicates uninitialized data
123	}
124
125	keyboard_manager::~keyboard_manager ()
126	{
127	clear ();
128	}
129
130	void
131	keyboard_manager::clear ()
132	{
133	keymap.clear ();
134	hash [0] = 2;
135
136	for (unsigned int i = 0; i < user_translations.size (); ++i)
137	{
138	free ((void *)user_translations [i]);
139	user_translations [i] = 0;
140	}
141
142	for (unsigned int i = 0; i < user_keymap.size (); ++i)
143	{
144	delete user_keymap [i];
145	user_keymap [i] = 0;
146	}
147
148	user_keymap.clear ();
149	user_translations.clear ();
150	}
151
152	// a wrapper for register_keymap,
153	// so that outside codes don't have to know so much details.
154	//
155	// the string 'trans' is copied to an internal managed buffer,
156	// so the caller can free memory of 'trans' at any time.
157	void
158	keyboard_manager::register_user_translation (KeySym keysym, unsigned int state, const char *trans)
159	{
160	keysym_t *key = new keysym_t;
161	wchar_t *wc = rxvt_mbstowcs (trans);
162	const char *translation = rxvt_wcstoutf8 (wc);
163	free (wc);
164
165	if (key && translation)
166	{
167	key->keysym = keysym;
168	key->state = state;
169	key->range = 1;
170	key->str = translation;
171	key->type = keysym_t::NORMAL;
172
173	if (strncmp (translation, "list", 4) == 0 && translation [4])
174	{
175	char *middle = strchr (translation + 5, translation [4]);
176	char *suffix = strrchr (translation + 5, translation [4]);
177
178	if (suffix && middle && suffix > middle + 1)
179	{
180	key->type = keysym_t::LIST;
181	key->range = suffix - middle - 1;
182
183	strcpy (translation, translation + 4);
184	}
185	else
186	rxvt_warn ("cannot parse list-type keysym '%s', treating as normal keysym.\n", translation);
187	}
188
189	user_keymap.push_back (key);
190	user_translations.push_back (translation);
191	register_keymap (key);
192	}
193	else
194	{
195	delete key;
196	free ((void *)translation);
197	rxvt_fatal ("out of memory, aborting.\n");
198	}
199	}
200
201	void
202	keyboard_manager::register_keymap (keysym_t *key)
203	{
204	if (keymap.size () == keymap.capacity ())
205	keymap.reserve (keymap.size () * 2);
206
207	keymap.push_back (key);
208	hash[0] = 3;
209	}
210
211	void
212	keyboard_manager::register_done ()
213	{
214	#if STOCK_KEYMAP
215	int n = sizeof (stock_keymap) / sizeof (keysym_t);
216
217	//TODO: shield against repeated calls and empty keymap
218	//if (keymap.back () != &stock_keymap[n - 1])
219	for (int i = 0; i < n; ++i)
220	register_keymap (&stock_keymap[i]);
221	#endif
222
223	purge_duplicate_keymap ();
224
225	setup_hash ();
226	}
227
228	bool
229	keyboard_manager::dispatch (rxvt_term *term, KeySym keysym, unsigned int state)
230	{
231	assert (hash[0] == 0 && "register_done() need to be called");
232
233	if (state & term->ModMetaMask) state \|= MetaMask;
234	if (state & term->ModNumLockMask) state \|= NumLockMask;
235	if (state & term->ModLevel3Mask) state \|= Level3Mask;
236
237	if (!!(term->priv_modes & PrivMode_aplKP) != !!(state & ShiftMask))
238	state \|= AppKeypadMask;
239
240	int index = find_keysym (keysym, state);
241
242	if (index >= 0)
243	{
244	const keysym_t &key = *keymap [index];
245
246	int keysym_offset = keysym - key.keysym;
247
248	wchar_t *wc = rxvt_utf8towcs (key.str);
249	char *str = rxvt_wcstombs (wc);
250	// TODO: do (some) translations, unescaping etc, here (allow \u escape etc.)
251	free (wc);
252
253	switch (key.type)
254	{
255	case keysym_t::NORMAL:
256	output_string (term, str);
257	break;
258
259	case keysym_t::RANGE:
260	{
261	char buf[STRING_MAX];
262
263	if (format_keyrange_string (str, keysym_offset, buf, sizeof (buf)) > 0)
264	output_string (term, buf);
265	}
266	break;
267
268	case keysym_t::RANGE_META8:
269	{
270	int len;
271	char buf[STRING_MAX];
272
273	len = format_keyrange_string (str, keysym_offset, buf, sizeof (buf));
274	if (len > 0)
275	output_string_meta8 (term, state, buf, len);
276	}
277	break;
278
279	case keysym_t::LIST:
280	{
281	char buf[STRING_MAX];
282
283	char prefix, middle, *suffix;
284
285	prefix = str;
286	middle = strchr (prefix + 1, *prefix);
287	suffix = strrchr (middle + 1, *prefix);
288
289	memcpy (buf, prefix + 1, middle - prefix - 1);
290	buf [middle - prefix - 1] = middle [keysym_offset + 1];
291	strcpy (buf + (middle - prefix), suffix + 1);
292
293	output_string (term, buf);
294	}
295	break;
296	}
297
298	free (str);
299
300	return true;
301	}
302	else
303	return false;
304	}
305
306	// purge duplicate keymap entries
307	void keyboard_manager::purge_duplicate_keymap ()
308	{
309	for (unsigned int i = 0; i < keymap.size (); ++i)
310	{
311	for (unsigned int j = 0; j < i; ++j)
312	{
313	if (keymap [i] == keymap [j])
314	{
315	while (keymap [i] == keymap.back ())
316	keymap.pop_back ();
317
318	if (i < keymap.size ())
319	{
320	keymap[i] = keymap.back ();
321	keymap.pop_back ();
322	}
323
324	break;
325	}
326	}
327	}
328	}
329
330	void
331	keyboard_manager::setup_hash ()
332	{
333	unsigned int i, index, hashkey;
334	vector <keysym_t *> sorted_keymap;
335	uint16_t hash_budget_size[KEYSYM_HASH_BUDGETS]; // size of each budget
336	uint16_t hash_budget_counter[KEYSYM_HASH_BUDGETS]; // #elements in each budget
337
338	memset (hash_budget_size, 0, sizeof (hash_budget_size));
339	memset (hash_budget_counter, 0, sizeof (hash_budget_counter));
340
341	// determine hash bucket size
342	for (i = 0; i < keymap.size (); ++i)
343	for (int j = min (keymap [i]->range, KEYSYM_HASH_BUDGETS) - 1; j >= 0; --j)
344	{
345	hashkey = (keymap [i]->keysym + j) & KEYSYM_HASH_MASK;
346	++hash_budget_size [hashkey];
347	}
348
349	// now we know the size of each budget
350	// compute the index of each budget
351	hash [0] = 0;
352	for (index = 0, i = 1; i < KEYSYM_HASH_BUDGETS; ++i)
353	{
354	index += hash_budget_size [i - 1];
355	hash [i] = index;
356	}
357
358	// and allocate just enough space
359	sorted_keymap.insert (sorted_keymap.begin (), index + hash_budget_size [i - 1], 0);
360
361	// fill in sorted_keymap
362	// it is sorted in each budget
363	for (i = 0; i < keymap.size (); ++i)
364	for (int j = min (keymap [i]->range, KEYSYM_HASH_BUDGETS) - 1; j >= 0; --j)
365	{
366	hashkey = (keymap [i]->keysym + j) & KEYSYM_HASH_MASK;
367
368	index = hash [hashkey] + hash_budget_counter [hashkey];
369
370	while (index > hash [hashkey]
371	&& compare_priority (keymap [i], sorted_keymap [index - 1]) > 0)
372	{
373	sorted_keymap [index] = sorted_keymap [index - 1];
374	--index;
375	}
376
377	sorted_keymap [index] = keymap [i];
378	++hash_budget_counter [hashkey];
379	}
380
381	keymap.swap (sorted_keymap);
382
383	#if defined (DEBUG_STRICT) \|\| defined (DEBUG_KEYBOARD)
384	// check for invariants
385	for (i = 0; i < KEYSYM_HASH_BUDGETS; ++i)
386	{
387	index = hash[i];
388	for (int j = 0; j < hash_budget_size [i]; ++j)
389	{
390	if (keymap [index + j]->range == 1)
391	assert (i == (keymap [index + j]->keysym & KEYSYM_HASH_MASK));
392
393	if (j)
394	assert (compare_priority (keymap [index + j - 1],
395	keymap [index + j]) >= 0);
396	}
397	}
398
399	// this should be able to detect most possible bugs
400	for (i = 0; i < sorted_keymap.size (); ++i)
401	{
402	keysym_t *a = sorted_keymap[i];
403	for (int j = 0; j < a->range; ++j)
404	{
405	int index = find_keysym (a->keysym + j, a->state);
406
407	assert (index >= 0);
408	keysym_t *b = keymap [index];
409	assert (i == (signed) index \|\| // the normally expected result
410	(a->keysym + j) >= b->keysym && (a->keysym + j) <= (b->keysym + b->range) && compare_priority (a, b) <= 0); // is effectively the same or a closer match
411	}
412	}
413	#endif
414	}
415
416	int
417	keyboard_manager::find_keysym (KeySym keysym, unsigned int state)
418	{
419	int hashkey = keysym & KEYSYM_HASH_MASK;
420	unsigned int index = hash [hashkey];
421	unsigned int end = hashkey < KEYSYM_HASH_BUDGETS - 1
422	? hash [hashkey + 1]
423	: keymap.size ();
424
425	for (; index < end; ++index)
426	{
427	keysym_t *key = keymap [index];
428
429	if (key->keysym <= keysym && keysym < key->keysym + key->range
430	// match only the specified bits in state and ignore others
431	&& (key->state & state) == key->state)
432	return index;
433	}
434
435	return -1;
436	}
437
438	#endif /* KEYSYM_RESOURCE */
439	// vim:et:ts=2:sw=2