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+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2007 - All Rights Reserved
+ *
+ * This file is a modification of the ICU file IndicReordering.cpp
+ * by Jens Herden and Javier Sola for Khmer language
+ *
+ */
+
+#include "LETypes.h"
+#include "OpenTypeTables.h"
+#include "KhmerReordering.h"
+#include "LEGlyphStorage.h"
+
+
+U_NAMESPACE_BEGIN
+
+// Characters that get refered to by name...
+enum
+{
+ C_SIGN_ZWNJ = 0x200C,
+ C_SIGN_ZWJ = 0x200D,
+ C_DOTTED_CIRCLE = 0x25CC,
+ C_RO = 0x179A,
+ C_VOWEL_AA = 0x17B6,
+ C_SIGN_NIKAHIT = 0x17C6,
+ C_VOWEL_E = 0x17C1,
+ C_COENG = 0x17D2
+};
+
+
+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 = KhmerClassTable::CC_RESERVED,
+ _sa = KhmerClassTable::CC_SIGN_ABOVE | KhmerClassTable::CF_DOTTED_CIRCLE | KhmerClassTable::CF_POS_ABOVE,
+ _sp = KhmerClassTable::CC_SIGN_AFTER | KhmerClassTable::CF_DOTTED_CIRCLE| KhmerClassTable::CF_POS_AFTER,
+ _c1 = KhmerClassTable::CC_CONSONANT | KhmerClassTable::CF_CONSONANT,
+ _c2 = KhmerClassTable::CC_CONSONANT2 | KhmerClassTable::CF_CONSONANT,
+ _c3 = KhmerClassTable::CC_CONSONANT3 | KhmerClassTable::CF_CONSONANT,
+ _rb = KhmerClassTable::CC_ROBAT | KhmerClassTable::CF_POS_ABOVE | KhmerClassTable::CF_DOTTED_CIRCLE,
+ _cs = KhmerClassTable::CC_CONSONANT_SHIFTER | KhmerClassTable::CF_DOTTED_CIRCLE | KhmerClassTable::CF_SHIFTER,
+ _dl = KhmerClassTable::CC_DEPENDENT_VOWEL | KhmerClassTable::CF_POS_BEFORE | KhmerClassTable::CF_DOTTED_CIRCLE,
+ _db = KhmerClassTable::CC_DEPENDENT_VOWEL | KhmerClassTable::CF_POS_BELOW | KhmerClassTable::CF_DOTTED_CIRCLE,
+ _da = KhmerClassTable::CC_DEPENDENT_VOWEL | KhmerClassTable::CF_POS_ABOVE | KhmerClassTable::CF_DOTTED_CIRCLE | KhmerClassTable::CF_ABOVE_VOWEL,
+ _dr = KhmerClassTable::CC_DEPENDENT_VOWEL | KhmerClassTable::CF_POS_AFTER | KhmerClassTable::CF_DOTTED_CIRCLE,
+ _co = KhmerClassTable::CC_COENG | KhmerClassTable::CF_COENG | KhmerClassTable::CF_DOTTED_CIRCLE,
+
+ // split vowel
+ _va = _da | KhmerClassTable::CF_SPLIT_VOWEL,
+ _vr = _dr | KhmerClassTable::CF_SPLIT_VOWEL
+};
+
+
+// Character class tables
+// _xx character does not combine into syllable, such as numbers, puntuation marks, non-Khmer signs...
+// _sa Sign placed above the base
+// _sp Sign placed after the base
+// _c1 Consonant of type 1 or independent vowel (independent vowels behave as type 1 consonants)
+// _c2 Consonant of type 2 (only RO)
+// _c3 Consonant of type 3
+// _rb Khmer sign robat u17CC. combining mark for subscript consonants
+// _cd Consonant-shifter
+// _dl Dependent vowel placed before the base (left of the base)
+// _db Dependent vowel placed below the base
+// _da Dependent vowel placed above the base
+// _dr Dependent vowel placed behind the base (right of the base)
+// _co Khmer combining mark COENG u17D2, combines with the consonant or independent vowel following
+// it to create a subscript consonant or independent vowel
+// _va Khmer split vowel in wich the first part is before the base and the second one above the base
+// _vr Khmer split vowel in wich the first part is before the base and the second one behind (right of) the base
+
+static const KhmerClassTable::CharClass khmerCharClasses[] =
+{
+ _c1, _c1, _c1, _c3, _c1, _c1, _c1, _c1, _c3, _c1, _c1, _c1, _c1, _c3, _c1, _c1, // 1780 - 178F
+ _c1, _c1, _c1, _c1, _c3, _c1, _c1, _c1, _c1, _c3, _c2, _c1, _c1, _c1, _c3, _c3, // 1790 - 179F
+ _c1, _c3, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, _c1, // 17A0 - 17AF
+ _c1, _c1, _c1, _c1, _dr, _dr, _dr, _da, _da, _da, _da, _db, _db, _db, _va, _vr, // 17B0 - 17BF
+ _vr, _dl, _dl, _dl, _vr, _vr, _sa, _sp, _sp, _cs, _cs, _sa, _rb, _sa, _sa, _sa, // 17C0 - 17CF
+ _sa, _sa, _co, _sa, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _xx, _sa, _xx, _xx, // 17D0 - 17DF
+};
+
+
+//
+// Khmer Class Tables
+//
+
+//
+// The range of characters defined in the above table is defined here. FOr Khmer 1780 to 17DF
+// Even if the Khmer range is bigger, all other characters are not combinable, and therefore treated
+// as _xx
+static const KhmerClassTable khmerClassTable = {0x1780, 0x17df, khmerCharClasses};
+
+
+// Below we define how a character in the input string is either in the khmerCharClasses table
+// (in which case we get its type back), a ZWJ or ZWNJ (two characters that may appear
+// within the syllable, but are not in the table) we also get their type back, or an unknown object
+// in which case we get _xx (CC_RESERVED) back
+KhmerClassTable::CharClass KhmerClassTable::getCharClass(LEUnicode ch) const
+{
+
+ if (ch == C_SIGN_ZWJ) {
+ return CC_ZERO_WIDTH_J_MARK;
+ }
+
+ if (ch == C_SIGN_ZWNJ) {
+ return CC_ZERO_WIDTH_NJ_MARK;
+ }
+
+ if (ch < firstChar || ch > lastChar) {
+ return CC_RESERVED;
+ }
+
+ return classTable[ch - firstChar];
+}
+
+const KhmerClassTable *KhmerClassTable::getKhmerClassTable()
+{
+ return &khmerClassTable;
+}
+
+
+
+class KhmerReorderingOutput : public UMemory {
+private:
+ le_int32 fSyllableCount;
+ le_int32 fOutIndex;
+ LEUnicode *fOutChars;
+
+ LEGlyphStorage &fGlyphStorage;
+
+
+public:
+ KhmerReorderingOutput(LEUnicode *outChars, LEGlyphStorage &glyphStorage)
+ : fSyllableCount(0), fOutIndex(0), fOutChars(outChars), fGlyphStorage(glyphStorage)
+ {
+ // nothing else to do...
+ }
+
+ ~KhmerReorderingOutput()
+ {
+ // nothing to do here...
+ }
+
+ void reset()
+ {
+ fSyllableCount += 1;
+ }
+
+ void writeChar(LEUnicode ch, le_uint32 charIndex, FeatureMask charFeatures)
+ {
+ LEErrorCode success = LE_NO_ERROR;
+
+ fOutChars[fOutIndex] = ch;
+
+ fGlyphStorage.setCharIndex(fOutIndex, charIndex, success);
+ fGlyphStorage.setAuxData(fOutIndex, charFeatures | (fSyllableCount & LE_GLYPH_GROUP_MASK), success);
+
+ fOutIndex += 1;
+ }
+
+ le_int32 getOutputIndex()
+ {
+ return fOutIndex;
+ }
+};
+
+
+#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
+
+#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 distFeatureMask 0x00400000UL
+#define blwmFeatureMask 0x00200000UL
+#define abvmFeatureMask 0x00100000UL
+#define mkmkFeatureMask 0x00080000UL
+
+#define tagPref (prefFeatureMask | presFeatureMask | cligFeatureMask | distFeatureMask)
+#define tagAbvf (abvfFeatureMask | abvsFeatureMask | cligFeatureMask | distFeatureMask | abvmFeatureMask | mkmkFeatureMask)
+#define tagPstf (blwfFeatureMask | blwsFeatureMask | prefFeatureMask | presFeatureMask | pstfFeatureMask | pstsFeatureMask | cligFeatureMask | distFeatureMask | blwmFeatureMask)
+#define tagBlwf (blwfFeatureMask | blwsFeatureMask | cligFeatureMask | distFeatureMask | blwmFeatureMask | mkmkFeatureMask)
+#define tagDefault (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
+ {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 Khmer Syllable.
+//
+// Each horizontal line is ordered exactly the same way as the values in KhmerClassTable
+// CharClassValues in KhmerReordering.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).
+//
+// Differentiating 3 types of consonants is necessary in order to
+// forbid the use of certain combinations, such as having a second
+// coeng after a coeng RO,
+// The inexistent possibility of having a type 3 after another type 3 is permitted,
+// eliminating it would very much complicate the table, and it does not create typing
+// problems, as the case above.
+//
+// The table is quite complex, in order to limit the number of coeng consonants
+// to 2 (by means of the table).
+//
+// There a peculiarity, as far as Unicode is concerned:
+// - The consonant-shifter is considered in two possible different
+// locations, the one considered in Unicode 3.0 and the one considered in
+// Unicode 4.0. (there is a backwards compatibility problem in this standard).
+
+
+// xx independent character, such as a number, punctuation sign or non-khmer char
+//
+// c1 Khmer consonant of type 1 or an independent vowel
+// that is, a letter in which the subscript for is only under the
+// base, not taking any space to the right or to the left
+//
+// c2 Khmer consonant of type 2, the coeng form takes space under
+// and to the left of the base (only RO is of this type)
+//
+// c3 Khmer consonant of type 3. Its subscript form takes space under
+// and to the right of the base.
+//
+// cs Khmer consonant shifter
+//
+// rb Khmer robat
+//
+// co coeng character (u17D2)
+//
+// dv dependent vowel (including split vowels, they are treated in the same way).
+// even if dv is not defined above, the component that is really tested for is
+// KhmerClassTable::CC_DEPENDENT_VOWEL, which is common to all dependent vowels
+//
+// zwj Zero Width joiner
+//
+// zwnj Zero width non joiner
+//
+// sa above sign
+//
+// sp post sign
+//
+// there are lines with equal content but for an easier understanding
+// (and maybe change in the future) we did not join them
+//
+static const le_int8 khmerStateTable[][KhmerClassTable::CC_COUNT] =
+{
+
+// xx c1 c2 c3 zwnj cs rb co dv sa sp zwj
+ { 1, 2, 2, 2, 1, 1, 1, 6, 1, 1, 1, 2}, // 0 - ground state
+ {-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, -1, -1, 3, 4, 5, 6, 16, 17, 1, -1}, // 2 - Base consonant
+ {-1, -1, -1, -1, -1, 4, -1, -1, 16, -1, -1, -1}, // 3 - First ZWNJ before a register shifter
+ // It can only be followed by a shifter or a vowel
+ {-1, -1, -1, -1, 15, -1, -1, 6, 16, 17, 1, 14}, // 4 - First register shifter
+ {-1, -1, -1, -1, -1, -1, -1, -1, 20, -1, 1, -1}, // 5 - Robat
+ {-1, 7, 8, 9, -1, -1, -1, -1, -1, -1, -1, -1}, // 6 - First Coeng
+ {-1, -1, -1, -1, 12, 13, -1, 10, 16, 17, 1, 14}, // 7 - First consonant of type 1 after coeng
+ {-1, -1, -1, -1, 12, 13, -1, -1, 16, 17, 1, 14}, // 8 - First consonant of type 2 after coeng
+ {-1, -1, -1, -1, 12, 13, -1, 10, 16, 17, 1, 14}, // 9 - First consonant or type 3 after ceong
+ {-1, 11, 11, 11, -1, -1, -1, -1, -1, -1, -1, -1}, // 10 - Second Coeng (no register shifter before)
+ {-1, -1, -1, -1, 15, -1, -1, -1, 16, 17, 1, 14}, // 11 - Second coeng consonant (or ind. vowel) no register shifter before
+ {-1, -1, -1, -1, -1, 13, -1, -1, 16, -1, -1, -1}, // 12 - Second ZWNJ before a register shifter
+ {-1, -1, -1, -1, 15, -1, -1, -1, 16, 17, 1, 14}, // 13 - Second register shifter
+ {-1, -1, -1, -1, -1, -1, -1, -1, 16, -1, -1, -1}, // 14 - ZWJ before vowel
+ {-1, -1, -1, -1, -1, -1, -1, -1, 16, -1, -1, -1}, // 15 - ZWNJ before vowel
+ {-1, -1, -1, -1, -1, -1, -1, -1, -1, 17, 1, 18}, // 16 - dependent vowel
+ {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 18}, // 17 - sign above
+ {-1, -1, -1, -1, -1, -1, -1, 19, -1, -1, -1, -1}, // 18 - ZWJ after vowel
+ {-1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, // 19 - Third coeng
+ {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1}, // 20 - dependent vowel after a Robat
+
+};
+
+
+const FeatureMap *KhmerReordering::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 KhmerReordering::findSyllable(const KhmerClassTable *classTable, const LEUnicode *chars, le_int32 prev, le_int32 charCount)
+{
+ le_int32 cursor = prev;
+ le_int8 state = 0;
+
+ while (cursor < charCount) {
+ KhmerClassTable::CharClass charClass = (classTable->getCharClass(chars[cursor]) & KhmerClassTable::CF_CLASS_MASK);
+
+ state = khmerStateTable[state][charClass];
+
+ if (state < 0) {
+ break;
+ }
+
+ cursor += 1;
+ }
+
+ return cursor;
+}
+
+
+// This is the real reordering function as applied to the Khmer language
+
+le_int32 KhmerReordering::reorder(const LEUnicode *chars, le_int32 charCount, le_int32 /*scriptCode*/,
+ LEUnicode *outChars, LEGlyphStorage &glyphStorage)
+{
+ const KhmerClassTable *classTable = KhmerClassTable::getKhmerClassTable();
+
+ KhmerReorderingOutput output(outChars, glyphStorage);
+ KhmerClassTable::CharClass charClass;
+ le_int32 i, prev = 0, coengRo;
+
+
+ // 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();
+
+ // write a pre vowel or the pre part of a split vowel first
+ // and look out for coeng + ro. RO is the only vowel of type 2, and
+ // therefore the only one that requires saving space before the base.
+ coengRo = -1; // There is no Coeng Ro, if found this value will change
+ for (i = prev; i < syllable; i += 1) {
+ charClass = classTable->getCharClass(chars[i]);
+
+ // if a split vowel, write the pre part. In Khmer the pre part
+ // is the same for all split vowels, same glyph as pre vowel C_VOWEL_E
+ if (charClass & KhmerClassTable::CF_SPLIT_VOWEL) {
+ output.writeChar(C_VOWEL_E, i, tagPref);
+ break; // there can be only one vowel
+ }
+
+ // if a vowel with pos before write it out
+ if (charClass & KhmerClassTable::CF_POS_BEFORE) {
+ output.writeChar(chars[i], i, tagPref);
+ break; // there can be only one vowel
+ }
+
+ // look for coeng + ro and remember position
+ // works because coeng + ro is always in front of a vowel (if there is a vowel)
+ // and because CC_CONSONANT2 is enough to identify it, as it is the only consonant
+ // with this flag
+ if ( (charClass & KhmerClassTable::CF_COENG) && (i + 1 < syllable) &&
+ ( (classTable->getCharClass(chars[i + 1]) & KhmerClassTable::CF_CLASS_MASK) == KhmerClassTable::CC_CONSONANT2) )
+ {
+ coengRo = i;
+ }
+ }
+
+ // write coeng + ro if found
+ if (coengRo > -1) {
+ output.writeChar(C_COENG, coengRo, tagPref);
+ output.writeChar(C_RO, coengRo + 1, tagPref);
+ }
+
+ // 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]) & KhmerClassTable::CF_DOTTED_CIRCLE) {
+ output.writeChar(C_DOTTED_CIRCLE, prev, tagDefault);
+ }
+
+ // copy what is left to the output, skipping before vowels and coeng Ro if they are present
+ for (i = prev; i < syllable; i += 1) {
+ charClass = classTable->getCharClass(chars[i]);
+
+ // skip a before vowel, it was already processed
+ if (charClass & KhmerClassTable::CF_POS_BEFORE) {
+ continue;
+ }
+
+ // skip coeng + ro, it was already processed
+ if (i == coengRo) {
+ i += 1;
+ continue;
+ }
+
+ switch (charClass & KhmerClassTable::CF_POS_MASK) {
+ case KhmerClassTable::CF_POS_ABOVE :
+ output.writeChar(chars[i], i, tagAbvf);
+ break;
+
+ case KhmerClassTable::CF_POS_AFTER :
+ output.writeChar(chars[i], i, tagPstf);
+ break;
+
+ case KhmerClassTable::CF_POS_BELOW :
+ output.writeChar(chars[i], i, tagBlwf);
+ break;
+
+ default:
+ // assign the correct flags to a coeng consonant
+ // Consonants of type 3 are taged as Post forms and those type 1 as below forms
+ if ( (charClass & KhmerClassTable::CF_COENG) && i + 1 < syllable ) {
+ if ( (classTable->getCharClass(chars[i + 1]) & KhmerClassTable::CF_CLASS_MASK)
+ == KhmerClassTable::CC_CONSONANT3) {
+ output.writeChar(chars[i], i, tagPstf);
+ i += 1;
+ output.writeChar(chars[i], i, tagPstf);
+ }
+ else {
+ output.writeChar(chars[i], i, tagBlwf);
+ i += 1;
+ output.writeChar(chars[i], i, tagBlwf);
+ }
+ break;
+ }
+ // if a shifter is followed by an above vowel change the shifter to below form,
+ // an above vowel can have two possible positions i + 1 or i + 3
+ // (position i+1 corresponds to unicode 3, position i+3 to Unicode 4)
+ // and there is an extra rule for C_VOWEL_AA + C_SIGN_NIKAHIT also for two
+ // different positions, right after the shifter or after a vowel (Unicode 4)
+ if ( (charClass & KhmerClassTable::CF_SHIFTER) && (i + 1 < syllable) ) {
+ if ((classTable->getCharClass(chars[i + 1]) & KhmerClassTable::CF_ABOVE_VOWEL)
+ || (i + 2 < syllable
+ && ( (classTable->getCharClass(chars[i + 1]) & KhmerClassTable::CF_CLASS_MASK) == C_VOWEL_AA)
+ && ( (classTable->getCharClass(chars[i + 2]) & KhmerClassTable::CF_CLASS_MASK) == C_SIGN_NIKAHIT))
+ || (i + 3 < syllable && (classTable->getCharClass(chars[i + 3]) & KhmerClassTable::CF_ABOVE_VOWEL))
+ || (i + 4 < syllable
+ && ( (classTable->getCharClass(chars[i + 3]) & KhmerClassTable::CF_CLASS_MASK) == C_VOWEL_AA)
+ && ( (classTable->getCharClass(chars[i + 4]) & KhmerClassTable::CF_CLASS_MASK) == C_SIGN_NIKAHIT) ) )
+ {
+ output.writeChar(chars[i], i, tagBlwf);
+ break;
+ }
+
+ }
+ // default - any other characters
+ output.writeChar(chars[i], i, tagDefault);
+ break;
+ } // switch
+ } // for
+
+ prev = syllable; // move the pointer to the start of next syllable
+ }
+
+ return output.getOutputIndex();
+}
+
+
+U_NAMESPACE_END