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      1 /*
      2  * Copyright  2009  Red Hat, Inc.
      3  * Copyright  2011  Codethink Limited
      4  * Copyright  2010,2011,2012  Google, Inc.
      5  *
      6  *  This is part of HarfBuzz, a text shaping library.
      7  *
      8  * Permission is hereby granted, without written agreement and without
      9  * license or royalty fees, to use, copy, modify, and distribute this
     10  * software and its documentation for any purpose, provided that the
     11  * above copyright notice and the following two paragraphs appear in
     12  * all copies of this software.
     13  *
     14  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     15  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     16  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     17  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     18  * DAMAGE.
     19  *
     20  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     21  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     22  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     23  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     24  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     25  *
     26  * Red Hat Author(s): Behdad Esfahbod
     27  * Codethink Author(s): Ryan Lortie
     28  * Google Author(s): Behdad Esfahbod
     29  */
     30 
     31 #include "hb-private.hh"
     32 
     33 #include "hb-unicode-private.hh"
     34 
     35 
     36 
     37 /*
     38  * hb_unicode_funcs_t
     39  */
     40 
     41 static hb_unicode_combining_class_t
     42 hb_unicode_combining_class_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
     43 				hb_codepoint_t      unicode   HB_UNUSED,
     44 				void               *user_data HB_UNUSED)
     45 {
     46   return HB_UNICODE_COMBINING_CLASS_NOT_REORDERED;
     47 }
     48 
     49 static unsigned int
     50 hb_unicode_eastasian_width_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
     51 				hb_codepoint_t      unicode   HB_UNUSED,
     52 				void               *user_data HB_UNUSED)
     53 {
     54   return 1;
     55 }
     56 
     57 static hb_unicode_general_category_t
     58 hb_unicode_general_category_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
     59 				 hb_codepoint_t      unicode   HB_UNUSED,
     60 				 void               *user_data HB_UNUSED)
     61 {
     62   return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
     63 }
     64 
     65 static hb_codepoint_t
     66 hb_unicode_mirroring_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
     67 			  hb_codepoint_t      unicode   HB_UNUSED,
     68 			  void               *user_data HB_UNUSED)
     69 {
     70   return unicode;
     71 }
     72 
     73 static hb_script_t
     74 hb_unicode_script_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
     75 		       hb_codepoint_t      unicode   HB_UNUSED,
     76 		       void               *user_data HB_UNUSED)
     77 {
     78   return HB_SCRIPT_UNKNOWN;
     79 }
     80 
     81 static hb_bool_t
     82 hb_unicode_compose_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
     83 			hb_codepoint_t      a         HB_UNUSED,
     84 			hb_codepoint_t      b         HB_UNUSED,
     85 			hb_codepoint_t     *ab        HB_UNUSED,
     86 			void               *user_data HB_UNUSED)
     87 {
     88   return false;
     89 }
     90 
     91 static hb_bool_t
     92 hb_unicode_decompose_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
     93 			  hb_codepoint_t      ab        HB_UNUSED,
     94 			  hb_codepoint_t     *a         HB_UNUSED,
     95 			  hb_codepoint_t     *b         HB_UNUSED,
     96 			  void               *user_data HB_UNUSED)
     97 {
     98   return false;
     99 }
    100 
    101 
    102 static unsigned int
    103 hb_unicode_decompose_compatibility_nil (hb_unicode_funcs_t *ufuncs     HB_UNUSED,
    104 					hb_codepoint_t      u          HB_UNUSED,
    105 					hb_codepoint_t     *decomposed HB_UNUSED,
    106 					void               *user_data  HB_UNUSED)
    107 {
    108   return 0;
    109 }
    110 
    111 
    112 #define HB_UNICODE_FUNCS_IMPLEMENT_SET \
    113   HB_UNICODE_FUNCS_IMPLEMENT (glib) \
    114   HB_UNICODE_FUNCS_IMPLEMENT (icu) \
    115   HB_UNICODE_FUNCS_IMPLEMENT (ucdn) \
    116   HB_UNICODE_FUNCS_IMPLEMENT (nil) \
    117   /* ^--- Add new callbacks before nil */
    118 
    119 #define hb_nil_get_unicode_funcs hb_unicode_funcs_get_empty
    120 
    121 /* Prototype them all */
    122 #define HB_UNICODE_FUNCS_IMPLEMENT(set) \
    123 extern "C" hb_unicode_funcs_t *hb_##set##_get_unicode_funcs (void);
    124 HB_UNICODE_FUNCS_IMPLEMENT_SET
    125 #undef HB_UNICODE_FUNCS_IMPLEMENT
    126 
    127 
    128 hb_unicode_funcs_t *
    129 hb_unicode_funcs_get_default (void)
    130 {
    131 #define HB_UNICODE_FUNCS_IMPLEMENT(set) \
    132   return hb_##set##_get_unicode_funcs ();
    133 
    134 #ifdef HAVE_GLIB
    135   HB_UNICODE_FUNCS_IMPLEMENT(glib)
    136 #elif defined(HAVE_ICU) && defined(HAVE_ICU_BUILTIN)
    137   HB_UNICODE_FUNCS_IMPLEMENT(icu)
    138 #elif defined(HAVE_UCDN)
    139   HB_UNICODE_FUNCS_IMPLEMENT(ucdn)
    140 #else
    141 #define HB_UNICODE_FUNCS_NIL 1
    142   HB_UNICODE_FUNCS_IMPLEMENT(nil)
    143 #endif
    144 
    145 #undef HB_UNICODE_FUNCS_IMPLEMENT
    146 }
    147 
    148 #if !defined(HB_NO_UNICODE_FUNCS) && defined(HB_UNICODE_FUNCS_NIL)
    149 #error "Could not find any Unicode functions implementation, you have to provide your own"
    150 #error "Consider building hb-ucdn.c.  If you absolutely want to build without any, check the code."
    151 #endif
    152 
    153 /**
    154  * hb_unicode_funcs_create: (Xconstructor)
    155  * @parent: (nullable):
    156  *
    157  *
    158  *
    159  * Return value: (transfer full):
    160  *
    161  * Since: 0.9.2
    162  **/
    163 hb_unicode_funcs_t *
    164 hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
    165 {
    166   hb_unicode_funcs_t *ufuncs;
    167 
    168   if (!(ufuncs = hb_object_create<hb_unicode_funcs_t> ()))
    169     return hb_unicode_funcs_get_empty ();
    170 
    171   if (!parent)
    172     parent = hb_unicode_funcs_get_empty ();
    173 
    174   hb_unicode_funcs_make_immutable (parent);
    175   ufuncs->parent = hb_unicode_funcs_reference (parent);
    176 
    177   ufuncs->func = parent->func;
    178 
    179   /* We can safely copy user_data from parent since we hold a reference
    180    * onto it and it's immutable.  We should not copy the destroy notifiers
    181    * though. */
    182   ufuncs->user_data = parent->user_data;
    183 
    184   return ufuncs;
    185 }
    186 
    187 
    188 const hb_unicode_funcs_t _hb_unicode_funcs_nil = {
    189   HB_OBJECT_HEADER_STATIC,
    190 
    191   NULL, /* parent */
    192   true, /* immutable */
    193   {
    194 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_nil,
    195     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
    196 #undef HB_UNICODE_FUNC_IMPLEMENT
    197   }
    198 };
    199 
    200 /**
    201  * hb_unicode_funcs_get_empty:
    202  *
    203  *
    204  *
    205  * Return value: (transfer full):
    206  *
    207  * Since: 0.9.2
    208  **/
    209 hb_unicode_funcs_t *
    210 hb_unicode_funcs_get_empty (void)
    211 {
    212   return const_cast<hb_unicode_funcs_t *> (&_hb_unicode_funcs_nil);
    213 }
    214 
    215 /**
    216  * hb_unicode_funcs_reference: (skip)
    217  * @ufuncs: Unicode functions.
    218  *
    219  *
    220  *
    221  * Return value: (transfer full):
    222  *
    223  * Since: 0.9.2
    224  **/
    225 hb_unicode_funcs_t *
    226 hb_unicode_funcs_reference (hb_unicode_funcs_t *ufuncs)
    227 {
    228   return hb_object_reference (ufuncs);
    229 }
    230 
    231 /**
    232  * hb_unicode_funcs_destroy: (skip)
    233  * @ufuncs: Unicode functions.
    234  *
    235  *
    236  *
    237  * Since: 0.9.2
    238  **/
    239 void
    240 hb_unicode_funcs_destroy (hb_unicode_funcs_t *ufuncs)
    241 {
    242   if (!hb_object_destroy (ufuncs)) return;
    243 
    244 #define HB_UNICODE_FUNC_IMPLEMENT(name) \
    245   if (ufuncs->destroy.name) ufuncs->destroy.name (ufuncs->user_data.name);
    246     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
    247 #undef HB_UNICODE_FUNC_IMPLEMENT
    248 
    249   hb_unicode_funcs_destroy (ufuncs->parent);
    250 
    251   free (ufuncs);
    252 }
    253 
    254 /**
    255  * hb_unicode_funcs_set_user_data: (skip)
    256  * @ufuncs: Unicode functions.
    257  * @key:
    258  * @data:
    259  * @destroy:
    260  * @replace:
    261  *
    262  *
    263  *
    264  * Return value:
    265  *
    266  * Since: 0.9.2
    267  **/
    268 hb_bool_t
    269 hb_unicode_funcs_set_user_data (hb_unicode_funcs_t *ufuncs,
    270 			        hb_user_data_key_t *key,
    271 			        void *              data,
    272 			        hb_destroy_func_t   destroy,
    273 				hb_bool_t           replace)
    274 {
    275   return hb_object_set_user_data (ufuncs, key, data, destroy, replace);
    276 }
    277 
    278 /**
    279  * hb_unicode_funcs_get_user_data: (skip)
    280  * @ufuncs: Unicode functions.
    281  * @key:
    282  *
    283  *
    284  *
    285  * Return value: (transfer none):
    286  *
    287  * Since: 0.9.2
    288  **/
    289 void *
    290 hb_unicode_funcs_get_user_data (hb_unicode_funcs_t *ufuncs,
    291 			        hb_user_data_key_t *key)
    292 {
    293   return hb_object_get_user_data (ufuncs, key);
    294 }
    295 
    296 
    297 /**
    298  * hb_unicode_funcs_make_immutable:
    299  * @ufuncs: Unicode functions.
    300  *
    301  *
    302  *
    303  * Since: 0.9.2
    304  **/
    305 void
    306 hb_unicode_funcs_make_immutable (hb_unicode_funcs_t *ufuncs)
    307 {
    308   if (unlikely (hb_object_is_inert (ufuncs)))
    309     return;
    310 
    311   ufuncs->immutable = true;
    312 }
    313 
    314 /**
    315  * hb_unicode_funcs_is_immutable:
    316  * @ufuncs: Unicode functions.
    317  *
    318  *
    319  *
    320  * Return value:
    321  *
    322  * Since: 0.9.2
    323  **/
    324 hb_bool_t
    325 hb_unicode_funcs_is_immutable (hb_unicode_funcs_t *ufuncs)
    326 {
    327   return ufuncs->immutable;
    328 }
    329 
    330 /**
    331  * hb_unicode_funcs_get_parent:
    332  * @ufuncs: Unicode functions.
    333  *
    334  *
    335  *
    336  * Return value:
    337  *
    338  * Since: 0.9.2
    339  **/
    340 hb_unicode_funcs_t *
    341 hb_unicode_funcs_get_parent (hb_unicode_funcs_t *ufuncs)
    342 {
    343   return ufuncs->parent ? ufuncs->parent : hb_unicode_funcs_get_empty ();
    344 }
    345 
    346 
    347 #define HB_UNICODE_FUNC_IMPLEMENT(name)						\
    348 										\
    349 void										\
    350 hb_unicode_funcs_set_##name##_func (hb_unicode_funcs_t		   *ufuncs,	\
    351 				    hb_unicode_##name##_func_t	    func,	\
    352 				    void			   *user_data,	\
    353 				    hb_destroy_func_t		    destroy)	\
    354 {										\
    355   if (ufuncs->immutable)							\
    356     return;									\
    357 										\
    358   if (ufuncs->destroy.name)							\
    359     ufuncs->destroy.name (ufuncs->user_data.name);				\
    360 										\
    361   if (func) {									\
    362     ufuncs->func.name = func;							\
    363     ufuncs->user_data.name = user_data;						\
    364     ufuncs->destroy.name = destroy;						\
    365   } else {									\
    366     ufuncs->func.name = ufuncs->parent->func.name;				\
    367     ufuncs->user_data.name = ufuncs->parent->user_data.name;			\
    368     ufuncs->destroy.name = NULL;						\
    369   }										\
    370 }
    371 
    372 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
    373 #undef HB_UNICODE_FUNC_IMPLEMENT
    374 
    375 
    376 #define HB_UNICODE_FUNC_IMPLEMENT(return_type, name)				\
    377 										\
    378 return_type									\
    379 hb_unicode_##name (hb_unicode_funcs_t *ufuncs,					\
    380 		   hb_codepoint_t      unicode)					\
    381 {										\
    382   return ufuncs->name (unicode);						\
    383 }
    384 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
    385 #undef HB_UNICODE_FUNC_IMPLEMENT
    386 
    387 /**
    388  * hb_unicode_compose:
    389  * @ufuncs: Unicode functions.
    390  * @a:
    391  * @b:
    392  * @ab: (out):
    393  *
    394  *
    395  *
    396  * Return value:
    397  *
    398  * Since: 0.9.2
    399  **/
    400 hb_bool_t
    401 hb_unicode_compose (hb_unicode_funcs_t *ufuncs,
    402 		    hb_codepoint_t      a,
    403 		    hb_codepoint_t      b,
    404 		    hb_codepoint_t     *ab)
    405 {
    406   return ufuncs->compose (a, b, ab);
    407 }
    408 
    409 /**
    410  * hb_unicode_decompose:
    411  * @ufuncs: Unicode functions.
    412  * @ab:
    413  * @a: (out):
    414  * @b: (out):
    415  *
    416  *
    417  *
    418  * Return value:
    419  *
    420  * Since: 0.9.2
    421  **/
    422 hb_bool_t
    423 hb_unicode_decompose (hb_unicode_funcs_t *ufuncs,
    424 		      hb_codepoint_t      ab,
    425 		      hb_codepoint_t     *a,
    426 		      hb_codepoint_t     *b)
    427 {
    428   return ufuncs->decompose (ab, a, b);
    429 }
    430 
    431 /**
    432  * hb_unicode_decompose_compatibility:
    433  * @ufuncs: Unicode functions.
    434  * @u:
    435  * @decomposed: (out):
    436  *
    437  *
    438  *
    439  * Return value:
    440  *
    441  * Since: 0.9.2
    442  **/
    443 unsigned int
    444 hb_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs,
    445 				    hb_codepoint_t      u,
    446 				    hb_codepoint_t     *decomposed)
    447 {
    448   return ufuncs->decompose_compatibility (u, decomposed);
    449 }
    450 
    451 
    452 /* See hb-unicode-private.hh for details. */
    453 const uint8_t
    454 _hb_modified_combining_class[256] =
    455 {
    456   0, /* HB_UNICODE_COMBINING_CLASS_NOT_REORDERED */
    457   1, /* HB_UNICODE_COMBINING_CLASS_OVERLAY */
    458   2, 3, 4, 5, 6,
    459   7, /* HB_UNICODE_COMBINING_CLASS_NUKTA */
    460   8, /* HB_UNICODE_COMBINING_CLASS_KANA_VOICING */
    461   9, /* HB_UNICODE_COMBINING_CLASS_VIRAMA */
    462 
    463   /* Hebrew */
    464   HB_MODIFIED_COMBINING_CLASS_CCC10,
    465   HB_MODIFIED_COMBINING_CLASS_CCC11,
    466   HB_MODIFIED_COMBINING_CLASS_CCC12,
    467   HB_MODIFIED_COMBINING_CLASS_CCC13,
    468   HB_MODIFIED_COMBINING_CLASS_CCC14,
    469   HB_MODIFIED_COMBINING_CLASS_CCC15,
    470   HB_MODIFIED_COMBINING_CLASS_CCC16,
    471   HB_MODIFIED_COMBINING_CLASS_CCC17,
    472   HB_MODIFIED_COMBINING_CLASS_CCC18,
    473   HB_MODIFIED_COMBINING_CLASS_CCC19,
    474   HB_MODIFIED_COMBINING_CLASS_CCC20,
    475   HB_MODIFIED_COMBINING_CLASS_CCC21,
    476   HB_MODIFIED_COMBINING_CLASS_CCC22,
    477   HB_MODIFIED_COMBINING_CLASS_CCC23,
    478   HB_MODIFIED_COMBINING_CLASS_CCC24,
    479   HB_MODIFIED_COMBINING_CLASS_CCC25,
    480   HB_MODIFIED_COMBINING_CLASS_CCC26,
    481 
    482   /* Arabic */
    483   HB_MODIFIED_COMBINING_CLASS_CCC27,
    484   HB_MODIFIED_COMBINING_CLASS_CCC28,
    485   HB_MODIFIED_COMBINING_CLASS_CCC29,
    486   HB_MODIFIED_COMBINING_CLASS_CCC30,
    487   HB_MODIFIED_COMBINING_CLASS_CCC31,
    488   HB_MODIFIED_COMBINING_CLASS_CCC32,
    489   HB_MODIFIED_COMBINING_CLASS_CCC33,
    490   HB_MODIFIED_COMBINING_CLASS_CCC34,
    491   HB_MODIFIED_COMBINING_CLASS_CCC35,
    492 
    493   /* Syriac */
    494   HB_MODIFIED_COMBINING_CLASS_CCC36,
    495 
    496   37, 38, 39,
    497   40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
    498   60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
    499   80, 81, 82, 83,
    500 
    501   /* Telugu */
    502   HB_MODIFIED_COMBINING_CLASS_CCC84,
    503   85, 86, 87, 88, 89, 90,
    504   HB_MODIFIED_COMBINING_CLASS_CCC91,
    505   92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102,
    506 
    507   /* Thai */
    508   HB_MODIFIED_COMBINING_CLASS_CCC103,
    509   104, 105, 106,
    510   HB_MODIFIED_COMBINING_CLASS_CCC107,
    511   108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
    512 
    513   /* Lao */
    514   HB_MODIFIED_COMBINING_CLASS_CCC118,
    515   119, 120, 121,
    516   HB_MODIFIED_COMBINING_CLASS_CCC122,
    517   123, 124, 125, 126, 127, 128,
    518 
    519   /* Tibetan */
    520   HB_MODIFIED_COMBINING_CLASS_CCC129,
    521   HB_MODIFIED_COMBINING_CLASS_CCC130,
    522   131,
    523   HB_MODIFIED_COMBINING_CLASS_CCC132,
    524   133, 134, 135, 136, 137, 138, 139,
    525 
    526 
    527   140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
    528   150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
    529   160, 161, 162, 163, 164, 165, 166, 167, 168, 169,
    530   170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
    531   180, 181, 182, 183, 184, 185, 186, 187, 188, 189,
    532   190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
    533 
    534   200, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW_LEFT */
    535   201,
    536   202, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW */
    537   203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213,
    538   214, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE */
    539   215,
    540   216, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE_RIGHT */
    541   217,
    542   218, /* HB_UNICODE_COMBINING_CLASS_BELOW_LEFT */
    543   219,
    544   220, /* HB_UNICODE_COMBINING_CLASS_BELOW */
    545   221,
    546   222, /* HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT */
    547   223,
    548   224, /* HB_UNICODE_COMBINING_CLASS_LEFT */
    549   225,
    550   226, /* HB_UNICODE_COMBINING_CLASS_RIGHT */
    551   227,
    552   228, /* HB_UNICODE_COMBINING_CLASS_ABOVE_LEFT */
    553   229,
    554   230, /* HB_UNICODE_COMBINING_CLASS_ABOVE */
    555   231,
    556   232, /* HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT */
    557   233, /* HB_UNICODE_COMBINING_CLASS_DOUBLE_BELOW */
    558   234, /* HB_UNICODE_COMBINING_CLASS_DOUBLE_ABOVE */
    559   235, 236, 237, 238, 239,
    560   240, /* HB_UNICODE_COMBINING_CLASS_IOTA_SUBSCRIPT */
    561   241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254,
    562   255, /* HB_UNICODE_COMBINING_CLASS_INVALID */
    563 };
    564