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1 /*
2  * Copyright (C) 2007 Apple Computer, Inc.
3  *
4  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
19  *
20  * Alternatively, the contents of this file may be used under the terms
21  * of either the Mozilla Public License Version 1.1, found at
22  * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
23  * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
24  * (the "GPL"), in which case the provisions of the MPL or the GPL are
25  * applicable instead of those above.  If you wish to allow use of your
26  * version of this file only under the terms of one of those two
27  * licenses (the MPL or the GPL) and not to allow others to use your
28  * version of this file under the LGPL, indicate your decision by
29  * deletingthe provisions above and replace them with the notice and
30  * other provisions required by the MPL or the GPL, as the case may be.
31  * If you do not delete the provisions above, a recipient may use your
32  * version of this file under any of the LGPL, the MPL or the GPL.
33  */
34 
35 #include "config.h"
36 #include "UnicodeRange.h"
37 
38 namespace WebCore {
39 
40 // This table depends on unicode range definitions.
41 // Each item's index must correspond to a unicode range value
42 // eg. x-cyrillic = LangGroupTable[cRangeCyrillic]
43 static const char* gUnicodeRangeToLangGroupTable[] =
44 {
45   "x-cyrillic",
46   "el",
47   "tr",
48   "he",
49   "ar",
50   "x-baltic",
51   "th",
52   "ko",
53   "ja",
54   "zh-CN",
55   "zh-TW",
56   "x-devanagari",
57   "x-tamil",
58   "x-armn",
59   "x-beng",
60   "x-cans",
61   "x-ethi",
62   "x-geor",
63   "x-gujr",
64   "x-guru",
65   "x-khmr",
66   "x-mlym"
67 };
68 
69 /**********************************************************************
70  * Unicode subranges as defined in unicode 3.0
71  * x-western, x-central-euro, tr, x-baltic  -> latin
72  *  0000 - 036f
73  *  1e00 - 1eff
74  *  2000 - 206f  (general punctuation)
75  *  20a0 - 20cf  (currency symbols)
76  *  2100 - 214f  (letterlike symbols)
77  *  2150 - 218f  (Number Forms)
78  * el         -> greek
79  *  0370 - 03ff
80  *  1f00 - 1fff
81  * x-cyrillic -> cyrillic
82  *  0400 - 04ff
83  * he         -> hebrew
84  *  0590 - 05ff
85  * ar         -> arabic
86  *  0600 - 06ff
87  *  fb50 - fdff (arabic presentation forms)
88  *  fe70 - feff (arabic presentation forms b)
89  * th - thai
90  *  0e00 - 0e7f
91  * ko        -> korean
92  *  ac00 - d7af  (hangul Syllables)
93  *  1100 - 11ff    (jamo)
94  *  3130 - 318f (hangul compatibility jamo)
95  * ja
96  *  3040 - 309f (hiragana)
97  *  30a0 - 30ff (katakana)
98  * zh-CN
99  * zh-TW
100  *
101  * CJK
102  *  3100 - 312f (bopomofo)
103  *  31a0 - 31bf (bopomofo extended)
104  *  3000 - 303f (CJK Symbols and Punctuation)
105  *  2e80 - 2eff (CJK radicals supplement)
106  *  2f00 - 2fdf (Kangxi Radicals)
107  *  2ff0 - 2fff (Ideographic Description Characters)
108  *  3190 - 319f (kanbun)
109  *  3200 - 32ff (Enclosed CJK letters and Months)
110  *  3300 - 33ff (CJK compatibility)
111  *  3400 - 4dbf (CJK Unified Ideographs Extension A)
112  *  4e00 - 9faf (CJK Unified Ideographs)
113  *  f900 - fa5f (CJK Compatibility Ideographs)
114  *  fe30 - fe4f (CJK compatibility Forms)
115  *  ff00 - ffef (halfwidth and fullwidth forms)
116  *
117  * Armenian
118  *  0530 - 058f
119  * Sriac
120  *  0700 - 074f
121  * Thaana
122  *  0780 - 07bf
123  * Devanagari
124  *  0900 - 097f
125  * Bengali
126  *  0980 - 09ff
127  * Gurmukhi
128  *  0a00 - 0a7f
129  * Gujarati
130  *  0a80 - 0aff
131  * Oriya
132  *  0b00 - 0b7f
133  * Tamil
134  *  0b80 - 0bff
135  * Telugu
136  *  0c00 - 0c7f
137  * Kannada
138  *  0c80 - 0cff
139  * Malayalam
140  *  0d00 - 0d7f
141  * Sinhala
142  *  0d80 - 0def
143  * Lao
144  *  0e80 - 0eff
145  * Tibetan
146  *  0f00 - 0fbf
147  * Myanmar
148  *  1000 - 109f
149  * Georgian
150  *  10a0 - 10ff
151  * Ethiopic
152  *  1200 - 137f
153  * Cherokee
154  *  13a0 - 13ff
155  * Canadian Aboriginal Syllabics
156  *  1400 - 167f
157  * Ogham
158  *  1680 - 169f
159  * Runic
160  *  16a0 - 16ff
161  * Khmer
162  *  1780 - 17ff
163  * Mongolian
164  *  1800 - 18af
165  * Misc - superscripts and subscripts
166  *  2070 - 209f
167  * Misc - Combining Diacritical Marks for Symbols
168  *  20d0 - 20ff
169  * Misc - Arrows
170  *  2190 - 21ff
171  * Misc - Mathematical Operators
172  *  2200 - 22ff
173  * Misc - Miscellaneous Technical
174  *  2300 - 23ff
175  * Misc - Control picture
176  *  2400 - 243f
177  * Misc - Optical character recognition
178  *  2440 - 2450
179  * Misc - Enclose Alphanumerics
180  *  2460 - 24ff
181  * Misc - Box Drawing
182  *  2500 - 257f
183  * Misc - Block Elements
184  *  2580 - 259f
185  * Misc - Geometric Shapes
186  *  25a0 - 25ff
187  * Misc - Miscellaneous Symbols
188  *  2600 - 267f
189  * Misc - Dingbats
190  *  2700 - 27bf
191  * Misc - Braille Patterns
192  *  2800 - 28ff
193  * Yi Syllables
194  *  a000 - a48f
195  * Yi radicals
196  *  a490 - a4cf
197  * Alphabetic Presentation Forms
198  *  fb00 - fb4f
199  * Misc - Combining half Marks
200  *  fe20 - fe2f
201  * Misc - small form variants
202  *  fe50 - fe6f
203  * Misc - Specials
204  *  fff0 - ffff
205  *********************************************************************/
206 
207 static const unsigned cNumSubTables = 9;
208 static const unsigned cSubTableSize = 16;
209 
210 static const unsigned char gUnicodeSubrangeTable[cNumSubTables][cSubTableSize] =
211 {
212   { // table for X---
213     cRangeTableBase+1,  //u0xxx
214     cRangeTableBase+2,  //u1xxx
215     cRangeTableBase+3,  //u2xxx
216     cRangeSetCJK,       //u3xxx
217     cRangeSetCJK,       //u4xxx
218     cRangeSetCJK,       //u5xxx
219     cRangeSetCJK,       //u6xxx
220     cRangeSetCJK,       //u7xxx
221     cRangeSetCJK,       //u8xxx
222     cRangeSetCJK,       //u9xxx
223     cRangeTableBase+4,  //uaxxx
224     cRangeKorean,       //ubxxx
225     cRangeKorean,       //ucxxx
226     cRangeTableBase+5,  //udxxx
227     cRangePrivate,      //uexxx
228     cRangeTableBase+6   //ufxxx
229   },
230   { //table for 0X--
231     cRangeSetLatin,          //u00xx
232     cRangeSetLatin,          //u01xx
233     cRangeSetLatin,          //u02xx
234     cRangeGreek,             //u03xx     XXX 0300-036f is in fact cRangeCombiningDiacriticalMarks
235     cRangeCyrillic,          //u04xx
236     cRangeTableBase+7,       //u05xx, includes Cyrillic supplement, Hebrew, and Armenian
237     cRangeArabic,            //u06xx
238     cRangeTertiaryTable,     //u07xx
239     cRangeUnassigned,        //u08xx
240     cRangeTertiaryTable,     //u09xx
241     cRangeTertiaryTable,     //u0axx
242     cRangeTertiaryTable,     //u0bxx
243     cRangeTertiaryTable,     //u0cxx
244     cRangeTertiaryTable,     //u0dxx
245     cRangeTertiaryTable,     //u0exx
246     cRangeTibetan,           //u0fxx
247   },
248   { //table for 1x--
249     cRangeTertiaryTable,     //u10xx
250     cRangeKorean,            //u11xx
251     cRangeEthiopic,          //u12xx
252     cRangeTertiaryTable,     //u13xx
253     cRangeCanadian,          //u14xx
254     cRangeCanadian,          //u15xx
255     cRangeTertiaryTable,     //u16xx
256     cRangeKhmer,             //u17xx
257     cRangeMongolian,         //u18xx
258     cRangeUnassigned,        //u19xx
259     cRangeUnassigned,        //u1axx
260     cRangeUnassigned,        //u1bxx
261     cRangeUnassigned,        //u1cxx
262     cRangeUnassigned,        //u1dxx
263     cRangeSetLatin,          //u1exx
264     cRangeGreek,             //u1fxx
265   },
266   { //table for 2x--
267     cRangeSetLatin,          //u20xx
268     cRangeSetLatin,          //u21xx
269     cRangeMathOperators,     //u22xx
270     cRangeMiscTechnical,     //u23xx
271     cRangeControlOpticalEnclose, //u24xx
272     cRangeBoxBlockGeometrics, //u25xx
273     cRangeMiscSymbols,       //u26xx
274     cRangeDingbats,          //u27xx
275     cRangeBraillePattern,    //u28xx
276     cRangeUnassigned,        //u29xx
277     cRangeUnassigned,        //u2axx
278     cRangeUnassigned,        //u2bxx
279     cRangeUnassigned,        //u2cxx
280     cRangeUnassigned,        //u2dxx
281     cRangeSetCJK,            //u2exx
282     cRangeSetCJK,            //u2fxx
283   },
284   {  //table for ax--
285     cRangeYi,                //ua0xx
286     cRangeYi,                //ua1xx
287     cRangeYi,                //ua2xx
288     cRangeYi,                //ua3xx
289     cRangeYi,                //ua4xx
290     cRangeUnassigned,        //ua5xx
291     cRangeUnassigned,        //ua6xx
292     cRangeUnassigned,        //ua7xx
293     cRangeUnassigned,        //ua8xx
294     cRangeUnassigned,        //ua9xx
295     cRangeUnassigned,        //uaaxx
296     cRangeUnassigned,        //uabxx
297     cRangeKorean,            //uacxx
298     cRangeKorean,            //uadxx
299     cRangeKorean,            //uaexx
300     cRangeKorean,            //uafxx
301   },
302   {  //table for dx--
303     cRangeKorean,            //ud0xx
304     cRangeKorean,            //ud1xx
305     cRangeKorean,            //ud2xx
306     cRangeKorean,            //ud3xx
307     cRangeKorean,            //ud4xx
308     cRangeKorean,            //ud5xx
309     cRangeKorean,            //ud6xx
310     cRangeKorean,            //ud7xx
311     cRangeSurrogate,         //ud8xx
312     cRangeSurrogate,         //ud9xx
313     cRangeSurrogate,         //udaxx
314     cRangeSurrogate,         //udbxx
315     cRangeSurrogate,         //udcxx
316     cRangeSurrogate,         //uddxx
317     cRangeSurrogate,         //udexx
318     cRangeSurrogate,         //udfxx
319   },
320   { // table for fx--
321     cRangePrivate,           //uf0xx
322     cRangePrivate,           //uf1xx
323     cRangePrivate,           //uf2xx
324     cRangePrivate,           //uf3xx
325     cRangePrivate,           //uf4xx
326     cRangePrivate,           //uf5xx
327     cRangePrivate,           //uf6xx
328     cRangePrivate,           //uf7xx
329     cRangePrivate,           //uf8xx
330     cRangeSetCJK,            //uf9xx
331     cRangeSetCJK,            //ufaxx
332     cRangeArabic,            //ufbxx, includes alphabic presentation form
333     cRangeArabic,            //ufcxx
334     cRangeArabic,            //ufdxx
335     cRangeArabic,            //ufexx, includes Combining half marks,
336                              //                CJK compatibility forms,
337                              //                CJK compatibility forms,
338                              //                small form variants
339     cRangeTableBase+8,       //uffxx, halfwidth and fullwidth forms, includes Specials
340   },
341   { //table for 0x0500 - 0x05ff
342     cRangeCyrillic,          //u050x
343     cRangeCyrillic,          //u051x
344     cRangeCyrillic,          //u052x
345     cRangeArmenian,          //u053x
346     cRangeArmenian,          //u054x
347     cRangeArmenian,          //u055x
348     cRangeArmenian,          //u056x
349     cRangeArmenian,          //u057x
350     cRangeArmenian,          //u058x
351     cRangeHebrew,            //u059x
352     cRangeHebrew,            //u05ax
353     cRangeHebrew,            //u05bx
354     cRangeHebrew,            //u05cx
355     cRangeHebrew,            //u05dx
356     cRangeHebrew,            //u05ex
357     cRangeHebrew,            //u05fx
358   },
359   { //table for 0xff00 - 0xffff
360     cRangeSetCJK,            //uff0x, fullwidth latin
361     cRangeSetCJK,            //uff1x, fullwidth latin
362     cRangeSetCJK,            //uff2x, fullwidth latin
363     cRangeSetCJK,            //uff3x, fullwidth latin
364     cRangeSetCJK,            //uff4x, fullwidth latin
365     cRangeSetCJK,            //uff5x, fullwidth latin
366     cRangeSetCJK,            //uff6x, halfwidth katakana
367     cRangeSetCJK,            //uff7x, halfwidth katakana
368     cRangeSetCJK,            //uff8x, halfwidth katakana
369     cRangeSetCJK,            //uff9x, halfwidth katakana
370     cRangeSetCJK,            //uffax, halfwidth hangul jamo
371     cRangeSetCJK,            //uffbx, halfwidth hangul jamo
372     cRangeSetCJK,            //uffcx, halfwidth hangul jamo
373     cRangeSetCJK,            //uffdx, halfwidth hangul jamo
374     cRangeSetCJK,            //uffex, fullwidth symbols
375     cRangeSpecials,          //ufffx, Specials
376   },
377 };
378 
379 // Most scripts between U+0700 and U+16FF are assigned a chunk of 128 (0x80)
380 // code points so that the number of entries in the tertiary range
381 // table for that range is obtained by dividing (0x1700 - 0x0700) by 128.
382 // Exceptions: Ethiopic, Tibetan, Hangul Jamo and Canadian aboriginal
383 // syllabaries take multiple chunks and Ogham and Runic share a single chunk.
384 static const unsigned cTertiaryTableSize = ((0x1700 - 0x0700) / 0x80);
385 
386 static const unsigned char gUnicodeTertiaryRangeTable[cTertiaryTableSize] =
387 { //table for 0x0700 - 0x1600
388     cRangeSyriac,            //u070x
389     cRangeThaana,            //u078x
390     cRangeUnassigned,        //u080x  place holder(resolved in the 2ndary tab.)
391     cRangeUnassigned,        //u088x  place holder(resolved in the 2ndary tab.)
392     cRangeDevanagari,        //u090x
393     cRangeBengali,           //u098x
394     cRangeGurmukhi,          //u0a0x
395     cRangeGujarati,          //u0a8x
396     cRangeOriya,             //u0b0x
397     cRangeTamil,             //u0b8x
398     cRangeTelugu,            //u0c0x
399     cRangeKannada,           //u0c8x
400     cRangeMalayalam,         //u0d0x
401     cRangeSinhala,           //u0d8x
402     cRangeThai,              //u0e0x
403     cRangeLao,               //u0e8x
404     cRangeTibetan,           //u0f0x  place holder(resolved in the 2ndary tab.)
405     cRangeTibetan,           //u0f8x  place holder(resolved in the 2ndary tab.)
406     cRangeMyanmar,           //u100x
407     cRangeGeorgian,          //u108x
408     cRangeKorean,            //u110x  place holder(resolved in the 2ndary tab.)
409     cRangeKorean,            //u118x  place holder(resolved in the 2ndary tab.)
410     cRangeEthiopic,          //u120x  place holder(resolved in the 2ndary tab.)
411     cRangeEthiopic,          //u128x  place holder(resolved in the 2ndary tab.)
412     cRangeEthiopic,          //u130x
413     cRangeCherokee,          //u138x
414     cRangeCanadian,          //u140x  place holder(resolved in the 2ndary tab.)
415     cRangeCanadian,          //u148x  place holder(resolved in the 2ndary tab.)
416     cRangeCanadian,          //u150x  place holder(resolved in the 2ndary tab.)
417     cRangeCanadian,          //u158x  place holder(resolved in the 2ndary tab.)
418     cRangeCanadian,          //u160x
419     cRangeOghamRunic,        //u168x  this contains two scripts, Ogham & Runic
420 };
421 
422 // A two level index is almost enough for locating a range, with the
423 // exception of u03xx and u05xx. Since we don't really care about range for
424 // combining diacritical marks in our font application, they are
425 // not discriminated further.  Future adoption of this method for other use
426 // should be aware of this limitation. The implementation can be extended if
427 // there is such a need.
428 // For Indic, Southeast Asian scripts and some other scripts between
429 // U+0700 and U+16FF, it's extended to the third level.
findCharUnicodeRange(UChar32 ch)430 unsigned int findCharUnicodeRange(UChar32 ch)
431 {
432     if (ch >= 0xFFFF)
433         return 0;
434 
435     unsigned int range;
436 
437     //search the first table
438     range = gUnicodeSubrangeTable[0][ch >> 12];
439 
440     if (range < cRangeTableBase)
441         // we try to get a specific range
442         return range;
443 
444     // otherwise, we have one more table to look at
445     range = gUnicodeSubrangeTable[range - cRangeTableBase][(ch & 0x0f00) >> 8];
446     if (range < cRangeTableBase)
447         return range;
448     if (range < cRangeTertiaryTable)
449         return gUnicodeSubrangeTable[range - cRangeTableBase][(ch & 0x00f0) >> 4];
450 
451     // Yet another table to look at : U+0700 - U+16FF : 128 code point blocks
452     return gUnicodeTertiaryRangeTable[(ch - 0x0700) >> 7];
453 }
454 
langGroupFromUnicodeRange(unsigned char unicodeRange)455 const char* langGroupFromUnicodeRange(unsigned char unicodeRange)
456 {
457     if (cRangeSpecificItemNum > unicodeRange)
458         return gUnicodeRangeToLangGroupTable[unicodeRange];
459     return 0;
460 }
461 
462 }
463