1/*
2 * Copyright © 2010,2012  Google, Inc.
3 *
4 *  This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27#include "hb-ot-shape-complex-private.hh"
28
29
30static bool
31compose_hebrew (const hb_ot_shape_normalize_context_t *c,
32		hb_codepoint_t  a,
33		hb_codepoint_t  b,
34		hb_codepoint_t *ab)
35{
36  /* Hebrew presentation-form shaping.
37   * https://bugzilla.mozilla.org/show_bug.cgi?id=728866
38   * Hebrew presentation forms with dagesh, for characters U+05D0..05EA;
39   * Note that some letters do not have a dagesh presForm encoded.
40   */
41  static const hb_codepoint_t sDageshForms[0x05EAu - 0x05D0u + 1] = {
42    0xFB30u, /* ALEF */
43    0xFB31u, /* BET */
44    0xFB32u, /* GIMEL */
45    0xFB33u, /* DALET */
46    0xFB34u, /* HE */
47    0xFB35u, /* VAV */
48    0xFB36u, /* ZAYIN */
49    0x0000u, /* HET */
50    0xFB38u, /* TET */
51    0xFB39u, /* YOD */
52    0xFB3Au, /* FINAL KAF */
53    0xFB3Bu, /* KAF */
54    0xFB3Cu, /* LAMED */
55    0x0000u, /* FINAL MEM */
56    0xFB3Eu, /* MEM */
57    0x0000u, /* FINAL NUN */
58    0xFB40u, /* NUN */
59    0xFB41u, /* SAMEKH */
60    0x0000u, /* AYIN */
61    0xFB43u, /* FINAL PE */
62    0xFB44u, /* PE */
63    0x0000u, /* FINAL TSADI */
64    0xFB46u, /* TSADI */
65    0xFB47u, /* QOF */
66    0xFB48u, /* RESH */
67    0xFB49u, /* SHIN */
68    0xFB4Au /* TAV */
69  };
70
71  bool found = c->unicode->compose (a, b, ab);
72
73  if (!found && !c->plan->has_mark)
74  {
75      /* Special-case Hebrew presentation forms that are excluded from
76       * standard normalization, but wanted for old fonts. */
77      switch (b) {
78      case 0x05B4u: /* HIRIQ */
79	  if (a == 0x05D9u) { /* YOD */
80	      *ab = 0xFB1Du;
81	      found = true;
82	  }
83	  break;
84      case 0x05B7u: /* patah */
85	  if (a == 0x05F2u) { /* YIDDISH YOD YOD */
86	      *ab = 0xFB1Fu;
87	      found = true;
88	  } else if (a == 0x05D0u) { /* ALEF */
89	      *ab = 0xFB2Eu;
90	      found = true;
91	  }
92	  break;
93      case 0x05B8u: /* QAMATS */
94	  if (a == 0x05D0u) { /* ALEF */
95	      *ab = 0xFB2Fu;
96	      found = true;
97	  }
98	  break;
99      case 0x05B9u: /* HOLAM */
100	  if (a == 0x05D5u) { /* VAV */
101	      *ab = 0xFB4Bu;
102	      found = true;
103	  }
104	  break;
105      case 0x05BCu: /* DAGESH */
106	  if (a >= 0x05D0u && a <= 0x05EAu) {
107	      *ab = sDageshForms[a - 0x05D0u];
108	      found = (*ab != 0);
109	  } else if (a == 0xFB2Au) { /* SHIN WITH SHIN DOT */
110	      *ab = 0xFB2Cu;
111	      found = true;
112	  } else if (a == 0xFB2Bu) { /* SHIN WITH SIN DOT */
113	      *ab = 0xFB2Du;
114	      found = true;
115	  }
116	  break;
117      case 0x05BFu: /* RAFE */
118	  switch (a) {
119	  case 0x05D1u: /* BET */
120	      *ab = 0xFB4Cu;
121	      found = true;
122	      break;
123	  case 0x05DBu: /* KAF */
124	      *ab = 0xFB4Du;
125	      found = true;
126	      break;
127	  case 0x05E4u: /* PE */
128	      *ab = 0xFB4Eu;
129	      found = true;
130	      break;
131	  }
132	  break;
133      case 0x05C1u: /* SHIN DOT */
134	  if (a == 0x05E9u) { /* SHIN */
135	      *ab = 0xFB2Au;
136	      found = true;
137	  } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */
138	      *ab = 0xFB2Cu;
139	      found = true;
140	  }
141	  break;
142      case 0x05C2u: /* SIN DOT */
143	  if (a == 0x05E9u) { /* SHIN */
144	      *ab = 0xFB2Bu;
145	      found = true;
146	  } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */
147	      *ab = 0xFB2Du;
148	      found = true;
149	  }
150	  break;
151      }
152  }
153
154  return found;
155}
156
157
158const hb_ot_complex_shaper_t _hb_ot_complex_shaper_hebrew =
159{
160  "hebrew",
161  NULL, /* collect_features */
162  NULL, /* override_features */
163  NULL, /* data_create */
164  NULL, /* data_destroy */
165  NULL, /* preprocess_text */
166  HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
167  NULL, /* decompose */
168  compose_hebrew,
169  NULL, /* setup_masks */
170  HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
171  true, /* fallback_position */
172};
173