+++ /dev/null
-/*
- *
- * (C) Copyright IBM Corp. 1998-2007 - All Rights Reserved
- *
- * Developed at DIT - Government of Bhutan
- *
- * Contact person: Pema Geyleg - <pema_geyleg@druknet.bt>
- *
- * This file is a modification of the ICU file KhmerReordering.cpp
- * by Jens Herden and Javier Sola who have given all their possible rights to IBM and the Governement of Bhutan
- * A first module for Dzongkha was developed by Karunakar under Panlocalisation funding.
- * Assistance for this module has been received from Namgay Thinley, Christopher Fynn and Javier Sola
- *
- */
-
-//#include <stdio.h>
-#include "LETypes.h"
-#include "OpenTypeTables.h"
-#include "TibetanReordering.h"
-#include "LEGlyphStorage.h"
-
-
-U_NAMESPACE_BEGIN
-
-// Characters that get refered to by name...
-enum
-{
- C_DOTTED_CIRCLE = 0x25CC,
- C_PRE_NUMBER_MARK = 0x0F3F
- };
-
-
-enum
-{
- // simple classes, they are used in the statetable (in this file) to control the length of a syllable
- // they are also used to know where a character should be placed (location in reference to the base character)
- // and also to know if a character, when independtly displayed, should be displayed with a dotted-circle to
- // indicate error in syllable construction
- _xx = TibetanClassTable::CC_RESERVED,
- _ba = TibetanClassTable::CC_BASE,
- _sj = TibetanClassTable::CC_SUBJOINED | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_BELOW,
- _tp = TibetanClassTable::CC_TSA_PHRU | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_ABOVE,
- _ac = TibetanClassTable::CC_A_CHUNG | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_BELOW,
- _cs = TibetanClassTable::CC_COMP_SANSKRIT | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_BELOW,
- _ha = TibetanClassTable::CC_HALANTA | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_BELOW,
- _bv = TibetanClassTable::CC_BELOW_VOWEL | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_BELOW,
- _av = TibetanClassTable::CC_ABOVE_VOWEL | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_ABOVE,
- _an = TibetanClassTable::CC_ANUSVARA | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_ABOVE,
- _cb = TibetanClassTable::CC_CANDRABINDU | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_ABOVE,
- _vs = TibetanClassTable::CC_VISARGA | TibetanClassTable::CF_DOTTED_CIRCLE| TibetanClassTable::CF_POS_AFTER,
- _as = TibetanClassTable::CC_ABOVE_S_MARK | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_ABOVE,
- _bs = TibetanClassTable::CC_BELOW_S_MARK | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_BELOW,
- _di = TibetanClassTable::CC_DIGIT | TibetanClassTable::CF_DIGIT,
- _pd = TibetanClassTable::CC_PRE_DIGIT_MARK | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_PREDIGIT | TibetanClassTable::CF_POS_BEFORE ,
- _bd = TibetanClassTable::CC_POST_BELOW_DIGIT_M | TibetanClassTable::CF_DOTTED_CIRCLE | TibetanClassTable::CF_POS_AFTER
-};
-
-
-// Character class tables
-//_xx Non Combining characters
-//_ba Base Consonants
-//_sj Subjoined consonants
-//_tp Tsa - phru
-//_ac A-chung, Vowel Lengthening mark
-//_cs Precomposed Sanskrit vowel + subjoined consonants
-//_ha Halanta/Virama
-//_bv Below vowel
-//_av above vowel
-//_an Anusvara
-//_cb Candrabindu
-//_vs Visaraga/Post mark
-//_as Upper Stress marks
-//_bs Lower Stress marks
-//_di Digit
-//_pd Number pre combining, Needs reordering
-//_bd Other number combining marks
-
-static const TibetanClassTable::CharClass tibetanCharClasses[] =
-{
- // 0 1 2 3 4 5 6 7 8 9 a b c d e f
- _xx, _ba, _xx, _xx, _ba, _ba, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0F00 - 0F0F 0
- _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _bd, _bd, _xx, _xx, _xx, _xx, _xx, _xx, // 0F10 - 0F1F 1
- _di, _di, _di, _di, _di, _di, _di, _di, _di, _di, _xx, _xx, _xx, _xx, _xx, _xx, // 0F20 - 0F2F 2
- _xx, _xx, _xx, _xx, _xx, _bs, _xx, _bs, _xx, _tp, _xx, _xx, _xx, _xx, _bd, _pd, // 0F30 - 0F3F 3
- _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _xx, _ba, _ba, _ba, _ba, _ba, _ba, _ba, // 0F40 - 0F4F 4
- _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, // 0F50 - 0F5F 5
- _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _ba, _xx, _xx, _xx, _xx, _xx, // 0F60 - 0F6F 6
- _xx, _ac, _av, _cs, _bv, _bv, _cs, _cs, _cs, _cs, _av, _av, _av, _av, _an, _vs, // 0F70 - 0F7F 7
- _av, _cs, _cb, _cb, _ha, _xx, _as, _as, _ba, _ba, _ba, _ba, _xx, _xx, _xx, _xx, // 0F80 - 0F8F 8
- _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _xx, _sj, _sj, _sj, _sj, _sj, _sj, _sj, // 0F90 - 0F9F 9
- _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, // 0FA0 - 0FAF a
- _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _sj, _xx, _sj, _sj, // 0FB0 - 0FBF b
- _xx, _xx, _xx, _xx, _xx, _xx, _bs, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0FC0 - 0FCF c
- _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx,// 0FD0 - 0FDF d
- _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0FE0 - 0FEF e
- _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, // 0FF0 - 0FFF f
-};
-
-
-//
-// Tibetan Class Tables
-//
-
-//
-// The range of characters defined in the above table is defined here. For Tibetan 0F00 to 0FFF
-// Even if the Tibetan range is bigger, most of the characters are not combinable, and therefore treated
-// as _xx
-static const TibetanClassTable tibetanClassTable = {0x0F00, 0x0FFF, tibetanCharClasses};
-
-
-// Below we define how a character in the input string is either in the tibetanCharClasses table
-// (in which case we get its type back), or an unknown object in which case we get _xx (CC_RESERVED) back
-TibetanClassTable::CharClass TibetanClassTable::getCharClass(LEUnicode ch) const
-{
- if (ch < firstChar || ch > lastChar) {
- return CC_RESERVED;
- }
-
- return classTable[ch - firstChar];
-}
-
-const TibetanClassTable *TibetanClassTable::getTibetanClassTable()
-{
- return &tibetanClassTable;
-}
-
-
-
-class TibetanReorderingOutput : public UMemory {
-private:
- le_int32 fSyllableCount;
- le_int32 fOutIndex;
- LEUnicode *fOutChars;
-
- LEGlyphStorage &fGlyphStorage;
-
-
-public:
- TibetanReorderingOutput(LEUnicode *outChars, LEGlyphStorage &glyphStorage)
- : fSyllableCount(0), fOutIndex(0), fOutChars(outChars), fGlyphStorage(glyphStorage)
- {
- // nothing else to do...
- }
-
- ~TibetanReorderingOutput()
- {
- // nothing to do here...
- }
-
- void reset()
- {
- fSyllableCount += 1;
- }
-
- void writeChar(LEUnicode ch, le_uint32 charIndex, FeatureMask featureMask)
- {
- LEErrorCode success = LE_NO_ERROR;
-
- fOutChars[fOutIndex] = ch;
-
- fGlyphStorage.setCharIndex(fOutIndex, charIndex, success);
- fGlyphStorage.setAuxData(fOutIndex, featureMask, success);
-
- fOutIndex += 1;
- }
-
- le_int32 getOutputIndex()
- {
- return fOutIndex;
- }
-};
-
-
-//TODO remove unused flags
-#define ccmpFeatureTag LE_CCMP_FEATURE_TAG
-#define blwfFeatureTag LE_BLWF_FEATURE_TAG
-#define pstfFeatureTag LE_PSTF_FEATURE_TAG
-#define presFeatureTag LE_PRES_FEATURE_TAG
-#define blwsFeatureTag LE_BLWS_FEATURE_TAG
-#define abvsFeatureTag LE_ABVS_FEATURE_TAG
-#define pstsFeatureTag LE_PSTS_FEATURE_TAG
-
-#define blwmFeatureTag LE_BLWM_FEATURE_TAG
-#define abvmFeatureTag LE_ABVM_FEATURE_TAG
-#define distFeatureTag LE_DIST_FEATURE_TAG
-
-#define prefFeatureTag LE_PREF_FEATURE_TAG
-#define abvfFeatureTag LE_ABVF_FEATURE_TAG
-#define cligFeatureTag LE_CLIG_FEATURE_TAG
-#define mkmkFeatureTag LE_MKMK_FEATURE_TAG
-
-// Shaping features
-#define prefFeatureMask 0x80000000UL
-#define blwfFeatureMask 0x40000000UL
-#define abvfFeatureMask 0x20000000UL
-#define pstfFeatureMask 0x10000000UL
-#define presFeatureMask 0x08000000UL
-#define blwsFeatureMask 0x04000000UL
-#define abvsFeatureMask 0x02000000UL
-#define pstsFeatureMask 0x01000000UL
-#define cligFeatureMask 0x00800000UL
-#define ccmpFeatureMask 0x00040000UL
-
-// Positioning features
-#define distFeatureMask 0x00400000UL
-#define blwmFeatureMask 0x00200000UL
-#define abvmFeatureMask 0x00100000UL
-#define mkmkFeatureMask 0x00080000UL
-
-#define tagPref (ccmpFeatureMask | prefFeatureMask | presFeatureMask | cligFeatureMask | distFeatureMask)
-#define tagAbvf (ccmpFeatureMask | abvfFeatureMask | abvsFeatureMask | cligFeatureMask | distFeatureMask | abvmFeatureMask | mkmkFeatureMask)
-#define tagPstf (ccmpFeatureMask | blwfFeatureMask | blwsFeatureMask | prefFeatureMask | presFeatureMask | pstfFeatureMask | pstsFeatureMask | cligFeatureMask | distFeatureMask | blwmFeatureMask)
-#define tagBlwf (ccmpFeatureMask | blwfFeatureMask | blwsFeatureMask | cligFeatureMask | distFeatureMask | blwmFeatureMask | mkmkFeatureMask)
-#define tagDefault (ccmpFeatureMask | prefFeatureMask | blwfFeatureMask | presFeatureMask | blwsFeatureMask | cligFeatureMask | distFeatureMask | abvmFeatureMask | blwmFeatureMask | mkmkFeatureMask)
-
-
-
-// These are in the order in which the features need to be applied
-// for correct processing
-static const FeatureMap featureMap[] =
-{
- // Shaping features
- {ccmpFeatureTag, ccmpFeatureMask},
- {prefFeatureTag, prefFeatureMask},
- {blwfFeatureTag, blwfFeatureMask},
- {abvfFeatureTag, abvfFeatureMask},
- {pstfFeatureTag, pstfFeatureMask},
- {presFeatureTag, presFeatureMask},
- {blwsFeatureTag, blwsFeatureMask},
- {abvsFeatureTag, abvsFeatureMask},
- {pstsFeatureTag, pstsFeatureMask},
- {cligFeatureTag, cligFeatureMask},
-
- // Positioning features
- {distFeatureTag, distFeatureMask},
- {blwmFeatureTag, blwmFeatureMask},
- {abvmFeatureTag, abvmFeatureMask},
- {mkmkFeatureTag, mkmkFeatureMask},
-};
-
-static const le_int32 featureMapCount = LE_ARRAY_SIZE(featureMap);
-
-// The stateTable is used to calculate the end (the length) of a well
-// formed Tibetan Syllable.
-//
-// Each horizontal line is ordered exactly the same way as the values in TibetanClassTable
-// CharClassValues in TibetanReordering.h This coincidence of values allows the
-// follow up of the table.
-//
-// Each line corresponds to a state, which does not necessarily need to be a type
-// of component... for example, state 2 is a base, with is always a first character
-// in the syllable, but the state could be produced a consonant of any type when
-// it is the first character that is analysed (in ground state).
-//
-static const le_int8 tibetanStateTable[][TibetanClassTable::CC_COUNT] =
-{
-
-
- //Dzongkha state table
- //xx ba sj tp ac cs ha bv av an cb vs as bs di pd bd
- { 1, 2, 4, 3, 8, 7, 9, 10, 14, 13, 17, 18, 19, 19, 20, 21, 21,}, // 0 - ground state
- {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,}, // 1 - exit state (or sign to the right of the syllable)
- {-1, -1, 4, 3, 8, 7, 9, 10, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 2 - Base consonant
- {-1, -1, 5, -1, 8, 7, -1, 10, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 3 - Tsa phru after base
- {-1, -1, 4, 6, 8, 7, 9, 10, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 4 - Subjoined consonant after base
- {-1, -1, 5, -1, 8, 7, -1, 10, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 5 - Subjoined consonant after tsa phru
- {-1, -1, -1, -1, 8, 7, -1, 10, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 6 - Tsa phru after subjoined consonant
- {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 19, 19, -1, -1, -1,}, // 7 - Pre Composed Sanskrit
- {-1, -1, -1, -1, -1, -1, -1, 10, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 8 - A-chung
- {-1, -1, -1, -1, -1, -1, -1, -1, 14, 13, 17, -1, 19, 19, -1, -1, -1,}, // 9 - Halanta
- {-1, -1, -1, -1, -1, -1, -1, 11, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 10 - below vowel 1
- {-1, -1, -1, -1, -1, -1, -1, 12, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 11 - below vowel 2
- {-1, -1, -1, -1, -1, -1, -1, -1, 14, 13, 17, 18, 19, 19, -1, -1, -1,}, // 12 - below vowel 3
- {-1, -1, -1, -1, -1, -1, -1, -1, 14, 17, 17, 18, 19, 19, -1, -1, -1,}, // 13 - Anusvara before vowel
- {-1, -1, -1, -1, -1, -1, -1, -1, 15, 17, 17, 18, 19, 19, -1, -1, -1,}, // 14 - above vowel 1
- {-1, -1, -1, -1, -1, -1, -1, -1, 16, 17, 17, 18, 19, 19, -1, -1, -1,}, // 15 - above vowel 2
- {-1, -1, -1, -1, -1, -1, -1, -1, -1, 17, 17, 18, 19, 19, -1, -1, -1,}, // 16 - above vowel 3
- {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 18, 19, 19, -1, -1, -1,}, // 17 - Anusvara or Candrabindu after vowel
- {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 19, 19, -1, -1, -1,}, // 18 - Visarga
- {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,}, // 19 - strss mark
- {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 21, 21,}, // 20 - digit
- {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,}, // 21 - digit mark
-
-
-};
-
-
-const FeatureMap *TibetanReordering::getFeatureMap(le_int32 &count)
-{
- count = featureMapCount;
-
- return featureMap;
-}
-
-
-// Given an input string of characters and a location in which to start looking
-// calculate, using the state table, which one is the last character of the syllable
-// that starts in the starting position.
-le_int32 TibetanReordering::findSyllable(const TibetanClassTable *classTable, const LEUnicode *chars, le_int32 prev, le_int32 charCount)
-{
- le_int32 cursor = prev;
- le_int8 state = 0;
-
- while (cursor < charCount) {
- TibetanClassTable::CharClass charClass = (classTable->getCharClass(chars[cursor]) & TibetanClassTable::CF_CLASS_MASK);
-
- state = tibetanStateTable[state][charClass];
-
- if (state < 0) {
- break;
- }
-
- cursor += 1;
- }
-
- return cursor;
-}
-
-
-// This is the real reordering function as applied to the Tibetan language
-
-le_int32 TibetanReordering::reorder(const LEUnicode *chars, le_int32 charCount, le_int32,
- LEUnicode *outChars, LEGlyphStorage &glyphStorage)
-{
- const TibetanClassTable *classTable = TibetanClassTable::getTibetanClassTable();
-
- TibetanReorderingOutput output(outChars, glyphStorage);
- TibetanClassTable::CharClass charClass;
- le_int32 i, prev = 0;
-
- // This loop only exits when we reach the end of a run, which may contain
- // several syllables.
- while (prev < charCount) {
- le_int32 syllable = findSyllable(classTable, chars, prev, charCount);
-
- output.reset();
-
- // shall we add a dotted circle?
- // If in the position in which the base should be (first char in the string) there is
- // a character that has the Dotted circle flag (a character that cannot be a base)
- // then write a dotted circle
- if (classTable->getCharClass(chars[prev]) & TibetanClassTable::CF_DOTTED_CIRCLE) {
- output.writeChar(C_DOTTED_CIRCLE, prev, tagDefault);
- }
-
- // copy the rest to output, inverting the pre-number mark if present after a digit.
- for (i = prev; i < syllable; i += 1) {
- charClass = classTable->getCharClass(chars[i]);
-
- if ((TibetanClassTable::CF_DIGIT & charClass)
- && ( classTable->getCharClass(chars[i+1]) & TibetanClassTable::CF_PREDIGIT))
- {
- output.writeChar(C_PRE_NUMBER_MARK, i, tagPref);
- output.writeChar(chars[i], i+1 , tagPref);
- i += 1;
- } else {
- switch (charClass & TibetanClassTable::CF_POS_MASK) {
-
- // If the present character is a number, and the next character is a pre-number combining mark
- // then the two characters are reordered
-
- case TibetanClassTable::CF_POS_ABOVE :
- output.writeChar(chars[i], i, tagAbvf);
- break;
-
- case TibetanClassTable::CF_POS_AFTER :
- output.writeChar(chars[i], i, tagPstf);
- break;
-
- case TibetanClassTable::CF_POS_BELOW :
- output.writeChar(chars[i], i, tagBlwf);
- break;
-
- default:
- // default - any other characters
- output.writeChar(chars[i], i, tagDefault);
- break;
- } // switch
- } // if
- } // for
-
- prev = syllable; // move the pointer to the start of next syllable
- }
-
- return output.getOutputIndex();
-}
-
-
-U_NAMESPACE_END
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