--- /dev/null
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2006 - 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 fOutIndex;
+ LEUnicode *fOutChars;
+
+ LEGlyphStorage &fGlyphStorage;
+
+
+public:
+ TibetanReorderingOutput(LEUnicode *outChars, LEGlyphStorage &glyphStorage)
+ : fOutIndex(0), fOutChars(outChars), fGlyphStorage(glyphStorage)
+ {
+ // nothing else to do...
+ }
+
+ ~TibetanReorderingOutput()
+ {
+ // nothing to do here...
+ }
+
+ 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);
+
+ // 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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