390 lines
16 KiB
C++
390 lines
16 KiB
C++
/*
|
|
*
|
|
* (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
|