1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 *
6 * Copyright (C) 2004-2014, International Business Machines
7 * Corporation and others. All Rights Reserved.
8 *
9 *******************************************************************************
10 * file name: ubidi_props.c
11 * encoding: UTF-8
12 * tab size: 8 (not used)
13 * indentation:4
14 *
15 * created on: 2004dec30
16 * created by: Markus W. Scherer
17 *
18 * Low-level Unicode bidi/shaping properties access.
19 */
20
21 #include "unicode/utypes.h"
22 #include "unicode/uset.h"
23 #include "unicode/udata.h" /* UDataInfo */
24 #include "ucmndata.h" /* DataHeader */
25 #include "udatamem.h"
26 #include "uassert.h"
27 #include "cmemory.h"
28 #include "utrie2.h"
29 #include "ubidi_props.h"
30 #include "ucln_cmn.h"
31
32 struct UBiDiProps {
33 UDataMemory *mem;
34 const int32_t *indexes;
35 const uint32_t *mirrors;
36 const uint8_t *jgArray;
37 const uint8_t *jgArray2;
38
39 UTrie2 trie;
40 uint8_t formatVersion[4];
41 };
42
43 /* ubidi_props_data.h is machine-generated by genbidi --csource */
44 #define INCLUDED_FROM_UBIDI_PROPS_C
45 #include "ubidi_props_data.h"
46
47 /* set of property starts for UnicodeSet ------------------------------------ */
48
49 static UBool U_CALLCONV
_enumPropertyStartsRange(const void * context,UChar32 start,UChar32 end,uint32_t value)50 _enumPropertyStartsRange(const void *context, UChar32 start, UChar32 end, uint32_t value) {
51 (void)end;
52 (void)value;
53 /* add the start code point to the USet */
54 const USetAdder *sa=(const USetAdder *)context;
55 sa->add(sa->set, start);
56 return TRUE;
57 }
58
59 U_CFUNC void
ubidi_addPropertyStarts(const USetAdder * sa,UErrorCode * pErrorCode)60 ubidi_addPropertyStarts(const USetAdder *sa, UErrorCode *pErrorCode) {
61 int32_t i, length;
62 UChar32 c, start, limit;
63
64 const uint8_t *jgArray;
65 uint8_t prev, jg;
66
67 if(U_FAILURE(*pErrorCode)) {
68 return;
69 }
70
71 /* add the start code point of each same-value range of the trie */
72 utrie2_enum(&ubidi_props_singleton.trie, NULL, _enumPropertyStartsRange, sa);
73
74 /* add the code points from the bidi mirroring table */
75 length=ubidi_props_singleton.indexes[UBIDI_IX_MIRROR_LENGTH];
76 for(i=0; i<length; ++i) {
77 c=UBIDI_GET_MIRROR_CODE_POINT(ubidi_props_singleton.mirrors[i]);
78 sa->addRange(sa->set, c, c+1);
79 }
80
81 /* add the code points from the Joining_Group array where the value changes */
82 start=ubidi_props_singleton.indexes[UBIDI_IX_JG_START];
83 limit=ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT];
84 jgArray=ubidi_props_singleton.jgArray;
85 for(;;) {
86 prev=0;
87 while(start<limit) {
88 jg=*jgArray++;
89 if(jg!=prev) {
90 sa->add(sa->set, start);
91 prev=jg;
92 }
93 ++start;
94 }
95 if(prev!=0) {
96 /* add the limit code point if the last value was not 0 (it is now start==limit) */
97 sa->add(sa->set, limit);
98 }
99 if(limit==ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT]) {
100 /* switch to the second Joining_Group range */
101 start=ubidi_props_singleton.indexes[UBIDI_IX_JG_START2];
102 limit=ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT2];
103 jgArray=ubidi_props_singleton.jgArray2;
104 } else {
105 break;
106 }
107 }
108
109 /* add code points with hardcoded properties, plus the ones following them */
110
111 /* (none right now) */
112 }
113
114 /* property access functions ------------------------------------------------ */
115
116 U_CFUNC int32_t
ubidi_getMaxValue(UProperty which)117 ubidi_getMaxValue(UProperty which) {
118 int32_t max=ubidi_props_singleton.indexes[UBIDI_MAX_VALUES_INDEX];
119 switch(which) {
120 case UCHAR_BIDI_CLASS:
121 return (max&UBIDI_CLASS_MASK);
122 case UCHAR_JOINING_GROUP:
123 return (max&UBIDI_MAX_JG_MASK)>>UBIDI_MAX_JG_SHIFT;
124 case UCHAR_JOINING_TYPE:
125 return (max&UBIDI_JT_MASK)>>UBIDI_JT_SHIFT;
126 case UCHAR_BIDI_PAIRED_BRACKET_TYPE:
127 return (max&UBIDI_BPT_MASK)>>UBIDI_BPT_SHIFT;
128 default:
129 return -1; /* undefined */
130 }
131 }
132
133 U_CAPI UCharDirection
ubidi_getClass(UChar32 c)134 ubidi_getClass(UChar32 c) {
135 uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
136 return (UCharDirection)UBIDI_GET_CLASS(props);
137 }
138
139 U_CFUNC UBool
ubidi_isMirrored(UChar32 c)140 ubidi_isMirrored(UChar32 c) {
141 uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
142 return (UBool)UBIDI_GET_FLAG(props, UBIDI_IS_MIRRORED_SHIFT);
143 }
144
145 static UChar32
getMirror(UChar32 c,uint16_t props)146 getMirror(UChar32 c, uint16_t props) {
147 int32_t delta=UBIDI_GET_MIRROR_DELTA(props);
148 if(delta!=UBIDI_ESC_MIRROR_DELTA) {
149 return c+delta;
150 } else {
151 /* look for mirror code point in the mirrors[] table */
152 const uint32_t *mirrors;
153 uint32_t m;
154 int32_t i, length;
155 UChar32 c2;
156
157 mirrors=ubidi_props_singleton.mirrors;
158 length=ubidi_props_singleton.indexes[UBIDI_IX_MIRROR_LENGTH];
159
160 /* linear search */
161 for(i=0; i<length; ++i) {
162 m=mirrors[i];
163 c2=UBIDI_GET_MIRROR_CODE_POINT(m);
164 if(c==c2) {
165 /* found c, return its mirror code point using the index in m */
166 return UBIDI_GET_MIRROR_CODE_POINT(mirrors[UBIDI_GET_MIRROR_INDEX(m)]);
167 } else if(c<c2) {
168 break;
169 }
170 }
171
172 /* c not found, return it itself */
173 return c;
174 }
175 }
176
177 U_CFUNC UChar32
ubidi_getMirror(UChar32 c)178 ubidi_getMirror(UChar32 c) {
179 uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
180 return getMirror(c, props);
181 }
182
183 U_CFUNC UBool
ubidi_isBidiControl(UChar32 c)184 ubidi_isBidiControl(UChar32 c) {
185 uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
186 return (UBool)UBIDI_GET_FLAG(props, UBIDI_BIDI_CONTROL_SHIFT);
187 }
188
189 U_CFUNC UBool
ubidi_isJoinControl(UChar32 c)190 ubidi_isJoinControl(UChar32 c) {
191 uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
192 return (UBool)UBIDI_GET_FLAG(props, UBIDI_JOIN_CONTROL_SHIFT);
193 }
194
195 U_CFUNC UJoiningType
ubidi_getJoiningType(UChar32 c)196 ubidi_getJoiningType(UChar32 c) {
197 uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
198 return (UJoiningType)((props&UBIDI_JT_MASK)>>UBIDI_JT_SHIFT);
199 }
200
201 U_CFUNC UJoiningGroup
ubidi_getJoiningGroup(UChar32 c)202 ubidi_getJoiningGroup(UChar32 c) {
203 UChar32 start, limit;
204
205 start=ubidi_props_singleton.indexes[UBIDI_IX_JG_START];
206 limit=ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT];
207 if(start<=c && c<limit) {
208 return (UJoiningGroup)ubidi_props_singleton.jgArray[c-start];
209 }
210 start=ubidi_props_singleton.indexes[UBIDI_IX_JG_START2];
211 limit=ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT2];
212 if(start<=c && c<limit) {
213 return (UJoiningGroup)ubidi_props_singleton.jgArray2[c-start];
214 }
215 return U_JG_NO_JOINING_GROUP;
216 }
217
218 U_CFUNC UBidiPairedBracketType
ubidi_getPairedBracketType(UChar32 c)219 ubidi_getPairedBracketType(UChar32 c) {
220 uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
221 return (UBidiPairedBracketType)((props&UBIDI_BPT_MASK)>>UBIDI_BPT_SHIFT);
222 }
223
224 U_CFUNC UChar32
ubidi_getPairedBracket(UChar32 c)225 ubidi_getPairedBracket(UChar32 c) {
226 uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
227 if((props&UBIDI_BPT_MASK)==0) {
228 return c;
229 } else {
230 return getMirror(c, props);
231 }
232 }
233
234 /* public API (see uchar.h) ------------------------------------------------- */
235
236 U_CFUNC UCharDirection
u_charDirection(UChar32 c)237 u_charDirection(UChar32 c) {
238 return ubidi_getClass(c);
239 }
240
241 U_CFUNC UBool
u_isMirrored(UChar32 c)242 u_isMirrored(UChar32 c) {
243 return ubidi_isMirrored(c);
244 }
245
246 U_CFUNC UChar32
u_charMirror(UChar32 c)247 u_charMirror(UChar32 c) {
248 return ubidi_getMirror(c);
249 }
250
251 U_CAPI UChar32 U_EXPORT2
u_getBidiPairedBracket(UChar32 c)252 u_getBidiPairedBracket(UChar32 c) {
253 return ubidi_getPairedBracket(c);
254 }
255