1 /*
2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2009 Keith Stribley
4 * Copyright © 2011 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 * Google Author(s): Behdad Esfahbod
28 */
29
30 #include "hb.hh"
31
32 #ifdef HAVE_ICU
33
34 #include "hb-icu.h"
35
36 #include "hb-machinery.hh"
37
38 #include <unicode/uchar.h>
39 #include <unicode/unorm2.h>
40 #include <unicode/ustring.h>
41 #include <unicode/utf16.h>
42 #include <unicode/uversion.h>
43
44 /* ICU extra semicolon, fixed since 65, https://github.com/unicode-org/icu/commit/480bec3 */
45 #if U_ICU_VERSION_MAJOR_NUM < 65 && (defined(__GNUC__) || defined(__clang__))
46 #define HB_ICU_EXTRA_SEMI_IGNORED
47 #pragma GCC diagnostic push
48 #pragma GCC diagnostic ignored "-Wextra-semi-stmt"
49 #endif
50
51 /**
52 * SECTION:hb-icu
53 * @title: hb-icu
54 * @short_description: ICU integration
55 * @include: hb-icu.h
56 *
57 * Functions for using HarfBuzz with the International Components for Unicode
58 * (ICU) library. HarfBuzz supports using ICU to provide Unicode data, by attaching
59 * ICU functions to the virtual methods in a #hb_unicode_funcs_t function
60 * structure.
61 **/
62
63 /**
64 * hb_icu_script_to_script:
65 * @script: The UScriptCode identifier to query
66 *
67 * Fetches the #hb_script_t script that corresponds to the
68 * specified UScriptCode identifier.
69 *
70 * Return value: the #hb_script_t script found
71 *
72 **/
73
74 hb_script_t
hb_icu_script_to_script(UScriptCode script)75 hb_icu_script_to_script (UScriptCode script)
76 {
77 if (unlikely (script == USCRIPT_INVALID_CODE))
78 return HB_SCRIPT_INVALID;
79
80 return hb_script_from_string (uscript_getShortName (script), -1);
81 }
82
83 /**
84 * hb_icu_script_from_script:
85 * @script: The #hb_script_t script to query
86 *
87 * Fetches the UScriptCode identifier that corresponds to the
88 * specified #hb_script_t script.
89 *
90 * Return value: the UScriptCode identifier found
91 *
92 **/
93 UScriptCode
hb_icu_script_from_script(hb_script_t script)94 hb_icu_script_from_script (hb_script_t script)
95 {
96 if (unlikely (script == HB_SCRIPT_INVALID))
97 return USCRIPT_INVALID_CODE;
98
99 unsigned int numScriptCode = 1 + u_getIntPropertyMaxValue (UCHAR_SCRIPT);
100 for (unsigned int i = 0; i < numScriptCode; i++)
101 if (unlikely (hb_icu_script_to_script ((UScriptCode) i) == script))
102 return (UScriptCode) i;
103
104 return USCRIPT_UNKNOWN;
105 }
106
107
108 static hb_unicode_combining_class_t
hb_icu_unicode_combining_class(hb_unicode_funcs_t * ufuncs HB_UNUSED,hb_codepoint_t unicode,void * user_data HB_UNUSED)109 hb_icu_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
110 hb_codepoint_t unicode,
111 void *user_data HB_UNUSED)
112
113 {
114 return (hb_unicode_combining_class_t) u_getCombiningClass (unicode);
115 }
116
117 static hb_unicode_general_category_t
hb_icu_unicode_general_category(hb_unicode_funcs_t * ufuncs HB_UNUSED,hb_codepoint_t unicode,void * user_data HB_UNUSED)118 hb_icu_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
119 hb_codepoint_t unicode,
120 void *user_data HB_UNUSED)
121 {
122 switch (u_getIntPropertyValue(unicode, UCHAR_GENERAL_CATEGORY))
123 {
124 case U_UNASSIGNED: return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
125
126 case U_UPPERCASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER;
127 case U_LOWERCASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER;
128 case U_TITLECASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER;
129 case U_MODIFIER_LETTER: return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER;
130 case U_OTHER_LETTER: return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
131
132 case U_NON_SPACING_MARK: return HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK;
133 case U_ENCLOSING_MARK: return HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK;
134 case U_COMBINING_SPACING_MARK: return HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK;
135
136 case U_DECIMAL_DIGIT_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER;
137 case U_LETTER_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_LETTER_NUMBER;
138 case U_OTHER_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_OTHER_NUMBER;
139
140 case U_SPACE_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR;
141 case U_LINE_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_LINE_SEPARATOR;
142 case U_PARAGRAPH_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_PARAGRAPH_SEPARATOR;
143
144 case U_CONTROL_CHAR: return HB_UNICODE_GENERAL_CATEGORY_CONTROL;
145 case U_FORMAT_CHAR: return HB_UNICODE_GENERAL_CATEGORY_FORMAT;
146 case U_PRIVATE_USE_CHAR: return HB_UNICODE_GENERAL_CATEGORY_PRIVATE_USE;
147 case U_SURROGATE: return HB_UNICODE_GENERAL_CATEGORY_SURROGATE;
148
149
150 case U_DASH_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION;
151 case U_START_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION;
152 case U_END_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION;
153 case U_CONNECTOR_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION;
154 case U_OTHER_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION;
155
156 case U_MATH_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_MATH_SYMBOL;
157 case U_CURRENCY_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_CURRENCY_SYMBOL;
158 case U_MODIFIER_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL;
159 case U_OTHER_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_OTHER_SYMBOL;
160
161 case U_INITIAL_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION;
162 case U_FINAL_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION;
163 }
164
165 return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
166 }
167
168 static hb_codepoint_t
hb_icu_unicode_mirroring(hb_unicode_funcs_t * ufuncs HB_UNUSED,hb_codepoint_t unicode,void * user_data HB_UNUSED)169 hb_icu_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
170 hb_codepoint_t unicode,
171 void *user_data HB_UNUSED)
172 {
173 return u_charMirror(unicode);
174 }
175
176 static hb_script_t
hb_icu_unicode_script(hb_unicode_funcs_t * ufuncs HB_UNUSED,hb_codepoint_t unicode,void * user_data HB_UNUSED)177 hb_icu_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
178 hb_codepoint_t unicode,
179 void *user_data HB_UNUSED)
180 {
181 UErrorCode status = U_ZERO_ERROR;
182 UScriptCode scriptCode = uscript_getScript(unicode, &status);
183
184 if (unlikely (U_FAILURE (status)))
185 return HB_SCRIPT_UNKNOWN;
186
187 return hb_icu_script_to_script (scriptCode);
188 }
189
190 static hb_bool_t
hb_icu_unicode_compose(hb_unicode_funcs_t * ufuncs HB_UNUSED,hb_codepoint_t a,hb_codepoint_t b,hb_codepoint_t * ab,void * user_data)191 hb_icu_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
192 hb_codepoint_t a,
193 hb_codepoint_t b,
194 hb_codepoint_t *ab,
195 void *user_data)
196 {
197 const UNormalizer2 *normalizer = (const UNormalizer2 *) user_data;
198 UChar32 ret = unorm2_composePair (normalizer, a, b);
199 if (ret < 0) return false;
200 *ab = ret;
201 return true;
202 }
203
204 static hb_bool_t
hb_icu_unicode_decompose(hb_unicode_funcs_t * ufuncs HB_UNUSED,hb_codepoint_t ab,hb_codepoint_t * a,hb_codepoint_t * b,void * user_data)205 hb_icu_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
206 hb_codepoint_t ab,
207 hb_codepoint_t *a,
208 hb_codepoint_t *b,
209 void *user_data)
210 {
211 const UNormalizer2 *normalizer = (const UNormalizer2 *) user_data;
212 UChar decomposed[4];
213 int len;
214 UErrorCode icu_err = U_ZERO_ERROR;
215 len = unorm2_getRawDecomposition (normalizer, ab, decomposed,
216 ARRAY_LENGTH (decomposed), &icu_err);
217 if (U_FAILURE (icu_err) || len < 0) return false;
218
219 len = u_countChar32 (decomposed, len);
220 if (len == 1)
221 {
222 U16_GET_UNSAFE (decomposed, 0, *a);
223 *b = 0;
224 return *a != ab;
225 }
226 else if (len == 2)
227 {
228 len = 0;
229 U16_NEXT_UNSAFE (decomposed, len, *a);
230 U16_NEXT_UNSAFE (decomposed, len, *b);
231 }
232 return true;
233 }
234
235
236 static inline void free_static_icu_funcs ();
237
238 static struct hb_icu_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_t<hb_icu_unicode_funcs_lazy_loader_t>
239 {
createhb_icu_unicode_funcs_lazy_loader_t240 static hb_unicode_funcs_t *create ()
241 {
242 void *user_data = nullptr;
243 UErrorCode icu_err = U_ZERO_ERROR;
244 user_data = (void *) unorm2_getNFCInstance (&icu_err);
245 assert (user_data);
246
247 hb_unicode_funcs_t *funcs = hb_unicode_funcs_create (nullptr);
248
249 hb_unicode_funcs_set_combining_class_func (funcs, hb_icu_unicode_combining_class, nullptr, nullptr);
250 hb_unicode_funcs_set_general_category_func (funcs, hb_icu_unicode_general_category, nullptr, nullptr);
251 hb_unicode_funcs_set_mirroring_func (funcs, hb_icu_unicode_mirroring, nullptr, nullptr);
252 hb_unicode_funcs_set_script_func (funcs, hb_icu_unicode_script, nullptr, nullptr);
253 hb_unicode_funcs_set_compose_func (funcs, hb_icu_unicode_compose, user_data, nullptr);
254 hb_unicode_funcs_set_decompose_func (funcs, hb_icu_unicode_decompose, user_data, nullptr);
255
256 hb_unicode_funcs_make_immutable (funcs);
257
258 hb_atexit (free_static_icu_funcs);
259
260 return funcs;
261 }
262 } static_icu_funcs;
263
264 static inline
free_static_icu_funcs()265 void free_static_icu_funcs ()
266 {
267 static_icu_funcs.free_instance ();
268 }
269
270 /**
271 * hb_icu_get_unicode_funcs:
272 *
273 * Fetches a Unicode-functions structure that is populated
274 * with the appropriate ICU function for each method.
275 *
276 * Return value: (transfer none): a pointer to the #hb_unicode_funcs_t Unicode-functions structure
277 *
278 * Since: 0.9.38
279 **/
280 hb_unicode_funcs_t *
hb_icu_get_unicode_funcs()281 hb_icu_get_unicode_funcs ()
282 {
283 return static_icu_funcs.get_unconst ();
284 }
285
286 #ifdef HB_ICU_EXTRA_SEMI_IGNORED
287 #pragma GCC diagnostic pop
288 #endif
289
290 #endif
291