284 lines
13 KiB
C++
284 lines
13 KiB
C++
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/*
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* @(#)IndicClassTables.cpp 1.4 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "OpenTypeTables.h"
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#include "OpenTypeUtilities.h"
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#include "IndicReordering.h"
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#include "ScriptAndLanguageTags.h"
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#define ARRAY_SIZE(array) (sizeof array / sizeof array[0])
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enum
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{
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// Split matra table indices
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_x1 = 1 << IndicClassTable::CF_INDEX_SHIFT,
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_x2 = 2 << IndicClassTable::CF_INDEX_SHIFT,
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_x3 = 3 << IndicClassTable::CF_INDEX_SHIFT,
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_x4 = 4 << IndicClassTable::CF_INDEX_SHIFT,
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_x5 = 5 << IndicClassTable::CF_INDEX_SHIFT,
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_x6 = 6 << IndicClassTable::CF_INDEX_SHIFT,
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_x7 = 7 << IndicClassTable::CF_INDEX_SHIFT,
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_x8 = 8 << IndicClassTable::CF_INDEX_SHIFT,
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_x9 = 9 << IndicClassTable::CF_INDEX_SHIFT,
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// simple classes
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_xx = IndicClassTable::CC_RESERVED,
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_ma = IndicClassTable::CC_MODIFYING_MARK_ABOVE,
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_mp = IndicClassTable::CC_MODIFYING_MARK_POST,
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_iv = IndicClassTable::CC_INDEPENDENT_VOWEL,
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_ct = IndicClassTable::CC_CONSONANT | IndicClassTable::CF_CONSONANT,
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_cn = IndicClassTable::CC_CONSONANT_WITH_NUKTA | IndicClassTable::CF_CONSONANT,
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_nu = IndicClassTable::CC_NUKTA,
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_dv = IndicClassTable::CC_DEPENDENT_VOWEL,
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_dl = _dv | IndicClassTable::CF_MATRA_PRE,
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_db = _dv | IndicClassTable::CF_MATRA_BELOW,
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_da = _dv | IndicClassTable::CF_MATRA_ABOVE,
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_dr = _dv | IndicClassTable::CF_MATRA_POST,
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_lm = _dv | IndicClassTable::CF_LENGTH_MARK,
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_vr = IndicClassTable::CC_VIRAMA,
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// split matras
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_s1 = _dv | _x1,
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_s2 = _dv | _x2,
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_s3 = _dv | _x3,
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_s4 = _dv | _x4,
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_s5 = _dv | _x5,
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_s6 = _dv | _x6,
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_s7 = _dv | _x7,
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_s8 = _dv | _x8,
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_s9 = _dv | _x9,
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// consonants with special forms
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// NOTE: this assumes that no consonants with nukta have
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// special forms... (Bengali RA?)
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_bb = _ct | IndicClassTable::CF_BELOW_BASE,
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_pb = _ct | IndicClassTable::CF_POST_BASE,
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_vt = _bb | IndicClassTable::CF_VATTU,
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_rv = _vt | IndicClassTable::CF_REPH,
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_rp = _pb | IndicClassTable::CF_REPH
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};
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//
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// Character class tables
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//
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const IndicClassTable::CharClass devaCharClasses[] =
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{
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_xx, _ma, _ma, _mp, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, // 0900 - 090F
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_iv, _iv, _iv, _iv, _iv, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, // 0910 - 091F
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_ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _cn, _ct, _ct, _ct, _ct, _ct, _ct, // 0920 - 092F
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_rv, _cn, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _xx, _xx, _nu, _xx, _dr, _dl, // 0930 - 093F
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_dr, _db, _db, _db, _db, _da, _da, _da, _da, _dr, _dr, _dr, _dr, _vr, _xx, _xx, // 0940 - 094F
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_xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _cn, _cn, _cn, _cn, _cn, _cn, _cn, _cn, // 0950 - 095F
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_iv, _iv, _db, _db, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0960 - 096F
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_xx // 0970
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};
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const IndicClassTable::CharClass bengCharClasses[] =
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{
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_xx, _ma, _mp, _mp, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _xx, _xx, _iv, // 0980 - 098F
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_iv, _xx, _xx, _iv, _iv, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, // 0990 - 099F
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_ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _xx, _ct, _ct, _bb, _ct, _ct, _pb, // 09A0 - 09AF
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_rv, _xx, _ct, _xx, _xx, _xx, _ct, _ct, _ct, _ct, _xx, _xx, _nu, _xx, _dr, _dl, // 09B0 - 09BF
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_dr, _db, _db, _db, _db, _xx, _xx, _dl, _dl, _xx, _xx, _s1, _s2, _vr, _xx, _xx, // 09C0 - 09CF
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_xx, _xx, _xx, _xx, _xx, _xx, _xx, _dr, _xx, _xx, _xx, _xx, _cn, _cn, _xx, _cn, // 09D0 - 09DF
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_iv, _iv, _dv, _dv, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 09E0 - 09EF
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_ct, _ct, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx // 09F0 - 09FA
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};
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const IndicClassTable::CharClass punjCharClasses[] =
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{
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_xx, _xx, _ma, _xx, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _xx, _xx, _xx, _xx, _iv, // 0A00 - 0A0F
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_iv, _xx, _xx, _iv, _iv, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, // 0A10 - 0A1F
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_ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _xx, _ct, _ct, _ct, _ct, _ct, _bb, // 0A20 - 0A2F
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_vt, _xx, _ct, _ct, _xx, _bb, _ct, _xx, _ct, _bb, _xx, _xx, _nu, _xx, _dr, _dl, // 0A30 - 0A3F
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_dr, _db, _db, _xx, _xx, _xx, _xx, _da, _da, _xx, _xx, _da, _da, _vr, _xx, _xx, // 0A40 - 0A4F
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_xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _cn, _cn, _cn, _cn, _xx, _cn, _xx, // 0A50 - 0A5F
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_xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0A60 - 0A6F
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_ma, _ma, _ct, _ct, _xx // 0A70 - 0A74
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};
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const IndicClassTable::CharClass gujrCharClasses[] =
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{
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_xx, _ma, _ma, _mp, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _xx, _iv, _xx, _iv, // 0A80 - 0A8F
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_iv, _iv, _xx, _iv, _iv, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, // 0A90 - 0A9F
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_ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _xx, _ct, _ct, _ct, _ct, _ct, _ct, // 0AA0 - 0AAF
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_rv, _xx, _ct, _ct, _xx, _ct, _ct, _ct, _ct, _ct, _xx, _xx, _nu, _xx, _dr, _dl, // 0AB0 - 0ABF
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_dr, _db, _db, _db, _db, _da, _xx, _da, _da, _dr, _xx, _dr, _dr, _vr, _xx, _xx, // 0AC0 - 0ACF
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_xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0AD0 - 0ADF
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_iv, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx // 0AE0 - 0AEF
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};
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const IndicClassTable::CharClass oryaCharClasses[] =
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{
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_xx, _ma, _ma, _mp, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _xx, _xx, _iv, // 0B00 - 0B0F
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_iv, _xx, _xx, _iv, _iv, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, // 0B10 - 0B1F
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_ct, _ct, _ct, _ct, _bb, _ct, _ct, _ct, _bb, _xx, _ct, _ct, _bb, _bb, _bb, _pb, // 0B20 - 0B2F
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_rv, _xx, _bb, _bb, _xx, _xx, _ct, _ct, _ct, _ct, _xx, _xx, _nu, _xx, _dr, _da, // 0B30 - 0B3F
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_dr, _db, _db, _db, _xx, _xx, _xx, _dl, _s1, _xx, _xx, _s2, _s3, _vr, _xx, _xx, // 0B40 - 0B4F
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_xx, _xx, _xx, _xx, _xx, _xx, _da, _dr, _xx, _xx, _xx, _xx, _cn, _cn, _xx, _cn, // 0B50 - 0B5F
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_iv, _iv, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0B60 - 0B6F
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_xx // 0B70
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};
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const IndicClassTable::CharClass tamlCharClasses[] =
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{
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_xx, _xx, _ma, _mp, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _xx, _xx, _xx, _iv, _iv, // 0B80 - 0B8F
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_iv, _xx, _iv, _iv, _iv, _ct, _xx, _xx, _xx, _ct, _ct, _xx, _ct, _xx, _ct, _ct, // 0B90 - 0B9F
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_xx, _xx, _xx, _ct, _ct, _xx, _xx, _xx, _ct, _ct, _ct, _xx, _xx, _xx, _ct, _ct, // 0BA0 - 0BAF
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_ct, _ct, _ct, _ct, _ct, _ct, _xx, _ct, _ct, _ct, _xx, _xx, _xx, _xx, _dr, _dr, // 0BB0 - 0BBF
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_da, _dr, _dr, _xx, _xx, _xx, _dl, _dl, _dl, _xx, _s1, _s2, _s3, _vr, _xx, _xx, // 0BC0 - 0BCF
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_xx, _xx, _xx, _xx, _xx, _xx, _xx, _dr, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0BD0 - 0BDF
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_xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0BE0 - 0BEF
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_xx, _xx, _xx // 0BF0 - 0BF2
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};
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// FIXME: Should some of the bb's be pb's? (KA, NA, MA, YA, VA, etc. (approx 13))
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const IndicClassTable::CharClass teluCharClasses[] =
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{
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_xx, _mp, _mp, _mp, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _xx, _iv, _iv, // 0C00 - 0C0F
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_iv, _xx, _iv, _iv, _iv, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, // 0C10 - 0C1F
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_bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _xx, _bb, _bb, _bb, _bb, _bb, _bb, // 0C20 - 0C2F
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_vt, _ct, _bb, _bb, _xx, _bb, _bb, _bb, _bb, _bb, _xx, _xx, _xx, _xx, _da, _da, // 0C30 - 0C3F
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_da, _dr, _dr, _dr, _dr, _xx, _da, _da, _s1, _xx, _da, _da, _da, _vr, _xx, _xx, // 0C40 - 0C4F
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_xx, _xx, _xx, _xx, _xx, _da, _db, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0C50 - 0C5F
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_iv, _iv, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx // 0C60 - 0C6F
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};
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// FIXME: is 0CD5 a dr or an lm??
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const IndicClassTable::CharClass kndaCharClasses[] =
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{
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_xx, _xx, _mp, _mp, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _xx, _iv, // 0C80 - 0C8F
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_iv, _xx, _iv, _iv, _iv, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, // 0C90 - 0C9F
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_bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _bb, _xx, _bb, _bb, _bb, _bb, _bb, _bb, // 0CA0 - 0CAF
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_rp, _ct, _bb, _bb, _xx, _bb, _bb, _bb, _bb, _bb, _xx, _xx, _xx, _xx, _dr, _da, // 0CB0 - 0CBF
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_s1, _dr, _dr, _dr, _dr, _xx, _da, _s2, _s3, _xx, _s4, _s5, _da, _vr, _xx, _xx, // 0CC0 - 0CCF
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_xx, _xx, _xx, _xx, _xx, _lm, _dr, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _ct, _xx, // 0CD0 - 0CDF
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_iv, _iv, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx // 0CE0 - 0CEF
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};
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// FIXME: this is correct for old-style Malayalam (MAL) but not for reformed Malayalam (MLR)
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// FIXME: should there be a REPH for old-style Malayalam?
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const IndicClassTable::CharClass mlymCharClasses[] =
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{
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_xx, _xx, _mp, _mp, _xx, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _iv, _xx, _iv, _iv, // 0D00 - 0D0F
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_iv, _xx, _iv, _iv, _iv, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _ct, _bb, // 0D10 - 0D1F
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_ct, _ct, _ct, _bb, _ct, _bb, _bb, _ct, _ct, _xx, _ct, _ct, _ct, _ct, _ct, _ct, // 0D20 - 0D2F
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_pb, _cn, _bb, _ct, _ct, _pb, _ct, _ct, _ct, _ct, _xx, _xx, _xx, _xx, _dr, _dr, // 0D30 - 0D3F
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_dr, _db, _db, _db, _xx, _xx, _dl, _dl, _dl, _xx, _s1, _s2, _s3, _vr, _xx, _xx, // 0D40 - 0D4F
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_xx, _xx, _xx, _xx, _xx, _xx, _xx, _dr, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0D50 - 0D5F
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_iv, _iv, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx // 0D60 - 0D6F
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};
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//
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// Split matra tables
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//
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const SplitMatra bengSplitTable[] = {{0x09C7, 0x09BE}, {0x09C7, 0x09D7}};
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const SplitMatra oryaSplitTable[] = {{0x0B47, 0x0B56}, {0x0B47, 0x0B3E}, {0x0B47, 0x0B57}};
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const SplitMatra tamlSplitTable[] = {{0x0BC6, 0x0BBE}, {0x0BC7, 0x0BBE}, {0x0BC6, 0x0BD7}};
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const SplitMatra teluSplitTable[] = {{0x0C46, 0x0C56}};
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const SplitMatra kndaSplitTable[] = {{0x0CBF, 0x0CD5}, {0x0CC6, 0x0CD5}, {0x0CC6, 0x0CD6}, {0x0CC6, 0x0CC2},
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{0x0CC6, 0x0CC2, 0x0CD5}};
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const SplitMatra mlymSplitTable[] = {{0x0D46, 0x0D3E}, {0x0D47, 0x0D3E}, {0x0D46, 0x0D57}};
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//
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// Script Flags
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//
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// FIXME: post 'GSUB' reordering of MATRA_PRE's for Malayalam and Tamil
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// FIXME: reformed Malayalam needs to reorder VATTU to before base glyph...
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// FIXME: eyelash RA only for Devanagari??
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#define DEVA_SCRIPT_FLAGS (IndicClassTable::SF_EYELASH_RA | IndicClassTable::SF_NO_POST_BASE_LIMIT)
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#define BENG_SCRIPT_FLAGS (IndicClassTable::SF_REPH_AFTER_BELOW | IndicClassTable::SF_NO_POST_BASE_LIMIT)
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#define PUNJ_SCRIPT_FLAGS (IndicClassTable::SF_NO_POST_BASE_LIMIT)
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#define GUJR_SCRIPT_FLAGS (IndicClassTable::SF_NO_POST_BASE_LIMIT)
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#define ORYA_SCRIPT_FLAGS (IndicClassTable::SF_REPH_AFTER_BELOW | IndicClassTable::SF_NO_POST_BASE_LIMIT)
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#define TAML_SCRIPT_FLAGS (IndicClassTable::SF_MPRE_FIXUP | IndicClassTable::SF_NO_POST_BASE_LIMIT)
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#define TELU_SCRIPT_FLAGS (IndicClassTable::SF_MATRAS_AFTER_BASE | 3)
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#define KNDA_SCRIPT_FLAGS (IndicClassTable::SF_MATRAS_AFTER_BASE | 3)
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#define MLYM_SCRIPT_FLAGS (IndicClassTable::SF_NO_POST_BASE_LIMIT)
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//
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// Indic Class Tables
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//
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const IndicClassTable devaClassTable = {0x0900, 0x0970, 2, DEVA_SCRIPT_FLAGS, devaCharClasses, NULL};
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const IndicClassTable bengClassTable = {0x0980, 0x09FA, 3, BENG_SCRIPT_FLAGS, bengCharClasses, bengSplitTable};
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const IndicClassTable punjClassTable = {0x0A00, 0x0A74, 2, PUNJ_SCRIPT_FLAGS, punjCharClasses, NULL};
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const IndicClassTable gujrClassTable = {0x0A80, 0x0AEF, 2, GUJR_SCRIPT_FLAGS, gujrCharClasses, NULL};
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const IndicClassTable oryaClassTable = {0x0B00, 0x0B70, 3, ORYA_SCRIPT_FLAGS, oryaCharClasses, oryaSplitTable};
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const IndicClassTable tamlClassTable = {0x0B80, 0x0BF2, 3, TAML_SCRIPT_FLAGS, tamlCharClasses, tamlSplitTable};
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const IndicClassTable teluClassTable = {0x0C00, 0x0C6F, 3, TELU_SCRIPT_FLAGS, teluCharClasses, teluSplitTable};
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const IndicClassTable kndaClassTable = {0x0C80, 0x0CEF, 4, KNDA_SCRIPT_FLAGS, kndaCharClasses, kndaSplitTable};
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const IndicClassTable mlymClassTable = {0x0D00, 0x0D6F, 3, MLYM_SCRIPT_FLAGS, mlymCharClasses, mlymSplitTable};
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//
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// IndicClassTable addresses
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//
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const IndicClassTable *indicClassTables[] = {
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&devaClassTable, // 'deva'
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&bengClassTable, // 'beng'
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&punjClassTable, // 'punj' punjabi == gurmukhi
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&gujrClassTable, // 'gujr'
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&oryaClassTable, // 'orya'
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&tamlClassTable, // 'taml'
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&teluClassTable, // 'telu'
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&kndaClassTable, // 'knda'
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&mlymClassTable // 'mlyn'
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};
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IndicClassTable::CharClass IndicClassTable::getCharClass(LEUnicode ch) const
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{
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if (ch == C_SIGN_ZWJ) {
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return CF_CONSONANT | CC_ZERO_WIDTH_MARK;
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}
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if (ch == C_SIGN_ZWNJ) {
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return CC_ZERO_WIDTH_MARK;
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}
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if (ch < firstChar || ch > lastChar) {
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return CC_RESERVED;
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}
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return classTable[ch - firstChar];
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}
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const IndicClassTable *IndicClassTable::getScriptClassTable(le_int32 scriptCode)
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{
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if (scriptCode < devaScriptCode || scriptCode > mlymScriptCode) {
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return NULL;
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}
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return indicClassTables[scriptCode - devaScriptCode];
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}
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le_int32 IndicReordering::getWorstCaseExpansion(le_int32 scriptCode)
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{
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const IndicClassTable *classTable = IndicClassTable::getScriptClassTable(scriptCode);
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if (classTable == NULL) {
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return 1;
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}
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return classTable->getWorstCaseExpansion();
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}
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