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qt6-bb10/src/corelib/text/qunicodetools.cpp

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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
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** accordance with the commercial license agreement provided with the
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** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
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** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qunicodetools_p.h"
#include "qunicodetables_p.h"
#include "qvarlengtharray.h"
#if QT_CONFIG(library)
#include "qlibrary.h"
#endif
#include <limits.h>
#define FLAG(x) (1 << (x))
QT_BEGIN_NAMESPACE
Q_AUTOTEST_EXPORT int qt_initcharattributes_default_algorithm_only = 0;
namespace QUnicodeTools {
// -----------------------------------------------------------------------------------------------------
//
// The text boundaries determination algorithm.
// See https://www.unicode.org/reports/tr29/tr29-37.html
//
// -----------------------------------------------------------------------------------------------------
namespace GB {
// This table is indexed by the grapheme break classes of two
// (adjacent) code points.
// The class of the first code point selects an entry.
// If the entry's bit at position second_cp_class is set
// (in other words: if entry & (1u << second_cp_class) is non-zero)
// then there is NO grapheme break between the two code points.
using GBTableEntryType = quint16;
// Check that we have enough bits in the table (in case
// NumGraphemeBreakClasses grows too much).
static_assert(sizeof(GBTableEntryType) * CHAR_BIT >= QUnicodeTables::NumGraphemeBreakClasses,
"Internal error: increase the size in bits of GBTableEntryType");
// GB9, GB9a
static const GBTableEntryType Extend_SpacingMark_ZWJ =
FLAG(QUnicodeTables::GraphemeBreak_Extend)
| FLAG(QUnicodeTables::GraphemeBreak_SpacingMark)
| FLAG(QUnicodeTables::GraphemeBreak_ZWJ);
static const GBTableEntryType HardBreak = 0u;
static const GBTableEntryType breakTable[QUnicodeTables::NumGraphemeBreakClasses] = {
Extend_SpacingMark_ZWJ, // Any
FLAG(QUnicodeTables::GraphemeBreak_LF), // CR
HardBreak, // LF
HardBreak, // Control
Extend_SpacingMark_ZWJ, // Extend
Extend_SpacingMark_ZWJ, // ZWJ
Extend_SpacingMark_ZWJ, // RegionalIndicator
(Extend_SpacingMark_ZWJ
| FLAG(QUnicodeTables::GraphemeBreak_Any)
| FLAG(QUnicodeTables::GraphemeBreak_Prepend)
| FLAG(QUnicodeTables::GraphemeBreak_L)
| FLAG(QUnicodeTables::GraphemeBreak_V)
| FLAG(QUnicodeTables::GraphemeBreak_T)
| FLAG(QUnicodeTables::GraphemeBreak_LV)
| FLAG(QUnicodeTables::GraphemeBreak_LVT)
| FLAG(QUnicodeTables::GraphemeBreak_RegionalIndicator)
| FLAG(QUnicodeTables::GraphemeBreak_Extended_Pictographic)
), // Prepend
Extend_SpacingMark_ZWJ, // SpacingMark
(Extend_SpacingMark_ZWJ
| FLAG(QUnicodeTables::GraphemeBreak_L)
| FLAG(QUnicodeTables::GraphemeBreak_V)
| FLAG(QUnicodeTables::GraphemeBreak_LV)
| FLAG(QUnicodeTables::GraphemeBreak_LVT)
), // L
(Extend_SpacingMark_ZWJ
| FLAG(QUnicodeTables::GraphemeBreak_V)
| FLAG(QUnicodeTables::GraphemeBreak_T)
), // V
(Extend_SpacingMark_ZWJ
| FLAG(QUnicodeTables::GraphemeBreak_T)
), // T
(Extend_SpacingMark_ZWJ
| FLAG(QUnicodeTables::GraphemeBreak_V)
| FLAG(QUnicodeTables::GraphemeBreak_T)
), // LV
(Extend_SpacingMark_ZWJ
| FLAG(QUnicodeTables::GraphemeBreak_T)
), // LVT
Extend_SpacingMark_ZWJ // Extended_Pictographic
};
static bool shouldBreakBetweenClasses(QUnicodeTables::GraphemeBreakClass first,
QUnicodeTables::GraphemeBreakClass second)
{
return (breakTable[first] & FLAG(second)) == 0;
}
// Some rules (GB11, GB12, GB13) cannot be represented by the table alone,
// so we need to store some local state.
enum class State : uchar {
Normal,
GB11_ExtPicExt, // saw a Extend after a Extended_Pictographic
GB11_ExtPicExtZWJ, // saw a ZWG after a Extended_Pictographic and zero or more Extend
GB12_13_RI, // saw a RegionalIndicator following a non-RegionalIndicator
};
} // namespace GB
static void getGraphemeBreaks(const char16_t *string, qsizetype len, QCharAttributes *attributes)
{
QUnicodeTables::GraphemeBreakClass lcls = QUnicodeTables::GraphemeBreak_LF; // to meet GB1
GB::State state = GB::State::Normal;
for (qsizetype i = 0; i != len; ++i) {
qsizetype pos = i;
char32_t ucs4 = string[i];
if (QChar::isHighSurrogate(ucs4) && i + 1 != len) {
ushort low = string[i + 1];
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++i;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::GraphemeBreakClass cls = (QUnicodeTables::GraphemeBreakClass) prop->graphemeBreakClass;
bool shouldBreak = GB::shouldBreakBetweenClasses(lcls, cls);
switch (state) {
case GB::State::Normal:
if (lcls == QUnicodeTables::GraphemeBreak_Extended_Pictographic) { // GB11
if (cls == QUnicodeTables::GraphemeBreak_Extend) {
state = GB::State::GB11_ExtPicExt;
Q_ASSERT(!shouldBreak); // GB9, do not break before Extend
} else if (cls == QUnicodeTables::GraphemeBreak_ZWJ) {
state = GB::State::GB11_ExtPicExtZWJ;
Q_ASSERT(!shouldBreak); // GB9, do not break before ZWJ
}
} else if (cls == QUnicodeTables::GraphemeBreak_RegionalIndicator) { // GB12, GB13
state = GB::State::GB12_13_RI;
}
break;
case GB::State::GB11_ExtPicExt:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_Extend);
if (cls == QUnicodeTables::GraphemeBreak_Extend) {
// keep going in the current state
Q_ASSERT(!shouldBreak); // GB9, do not break before Extend
} else if (cls == QUnicodeTables::GraphemeBreak_ZWJ) {
state = GB::State::GB11_ExtPicExtZWJ;
Q_ASSERT(!shouldBreak); // GB9, do not break before ZWJ
}
break;
case GB::State::GB11_ExtPicExtZWJ:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_ZWJ);
if (cls == QUnicodeTables::GraphemeBreak_Extended_Pictographic)
shouldBreak = false;
state = GB::State::Normal;
break;
case GB::State::GB12_13_RI:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_RegionalIndicator);
if (cls == QUnicodeTables::GraphemeBreak_RegionalIndicator)
shouldBreak = false;
state = GB::State::Normal;
break;
}
if (shouldBreak)
attributes[pos].graphemeBoundary = true;
lcls = cls;
}
attributes[len].graphemeBoundary = true; // GB2
}
namespace WB {
enum Action {
NoBreak,
Break,
Lookup,
LookupW
};
static const uchar breakTable[QUnicodeTables::NumWordBreakClasses][QUnicodeTables::NumWordBreakClasses] = {
// Any CR LF Newline Extend ZWJ Format RI Katakana HLetter ALetter SQuote DQuote MidNumLet MidLetter MidNum Numeric ExtNumLet E_Base E_Mod GAZ EBG WSeg
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // Any
{ Break , Break , NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // CR
{ Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // LF
{ Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // Newline
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // Extend
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , NoBreak, NoBreak, Break }, // ZWJ
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // Format
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // RegionalIndicator
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , NoBreak, Break , Break , Break , Break , Break }, // Katakana
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , NoBreak, NoBreak, LookupW, Lookup , LookupW, LookupW, Break , NoBreak, NoBreak, Break , Break , Break , Break , Break }, // HebrewLetter
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , NoBreak, NoBreak, LookupW, Break , LookupW, LookupW, Break , NoBreak, NoBreak, Break , Break , Break , Break , Break }, // ALetter
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // SingleQuote
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // DoubleQuote
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // MidNumLet
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // MidLetter
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // MidNum
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , NoBreak, NoBreak, Lookup , Break , Lookup , Break , Lookup , NoBreak, NoBreak, Break , Break , Break , Break , Break }, // Numeric
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , NoBreak, NoBreak, Break , Break , Break , Break , Break }, // ExtendNumLet
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , NoBreak, Break , Break , Break }, // E_Base
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // E_Mod
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // GAZ
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , NoBreak, Break , Break , Break }, // EBG
{ Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // WSeg
};
} // namespace WB
static void getWordBreaks(const char16_t *string, qsizetype len, QCharAttributes *attributes)
{
enum WordType {
WordTypeNone, WordTypeAlphaNumeric, WordTypeHiraganaKatakana
} currentWordType = WordTypeNone;
QUnicodeTables::WordBreakClass cls = QUnicodeTables::WordBreak_LF; // to meet WB1
for (qsizetype i = 0; i != len; ++i) {
qsizetype pos = i;
char32_t ucs4 = string[i];
if (QChar::isHighSurrogate(ucs4) && i + 1 != len) {
ushort low = string[i + 1];
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++i;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::WordBreakClass ncls = (QUnicodeTables::WordBreakClass) prop->wordBreakClass;
#ifdef QT_BUILD_INTERNAL
if (qt_initcharattributes_default_algorithm_only) {
// as of Unicode 5.1, some punctuation marks were mapped to MidLetter and MidNumLet
// which caused "hi.there" to be treated like if it were just a single word;
// we keep the pre-5.1 behavior by remapping these characters in the Unicode tables generator
// and this code is needed to pass the coverage tests; remove once the issue is fixed.
if (ucs4 == 0x002E) // FULL STOP
ncls = QUnicodeTables::WordBreak_MidNumLet;
else if (ucs4 == 0x003A) // COLON
ncls = QUnicodeTables::WordBreak_MidLetter;
}
#endif
uchar action = WB::breakTable[cls][ncls];
switch (action) {
case WB::Break:
break;
case WB::NoBreak:
if (Q_UNLIKELY(ncls == QUnicodeTables::WordBreak_Extend || ncls == QUnicodeTables::WordBreak_ZWJ || ncls == QUnicodeTables::WordBreak_Format)) {
// WB4: X(Extend|Format)* -> X
if (cls != QUnicodeTables::WordBreak_ZWJ) // WB3c
continue;
}
if (Q_UNLIKELY(cls == QUnicodeTables::WordBreak_RegionalIndicator)) {
// WB15/WB16: break between pairs of Regional indicator
ncls = QUnicodeTables::WordBreak_Any;
}
break;
case WB::Lookup:
case WB::LookupW:
for (qsizetype lookahead = i + 1; lookahead < len; ++lookahead) {
ucs4 = string[lookahead];
if (QChar::isHighSurrogate(ucs4) && lookahead + 1 != len) {
ushort low = string[lookahead + 1];
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++lookahead;
}
}
prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::WordBreakClass tcls = (QUnicodeTables::WordBreakClass) prop->wordBreakClass;
if (Q_UNLIKELY(tcls == QUnicodeTables::WordBreak_Extend || tcls == QUnicodeTables::WordBreak_ZWJ || tcls == QUnicodeTables::WordBreak_Format)) {
// WB4: X(Extend|Format)* -> X
continue;
}
if (Q_LIKELY(tcls == cls || (action == WB::LookupW && (tcls == QUnicodeTables::WordBreak_HebrewLetter
|| tcls == QUnicodeTables::WordBreak_ALetter)))) {
i = lookahead;
ncls = tcls;
action = WB::NoBreak;
}
break;
}
if (action != WB::NoBreak) {
action = WB::Break;
if (Q_UNLIKELY(ncls == QUnicodeTables::WordBreak_SingleQuote && cls == QUnicodeTables::WordBreak_HebrewLetter))
action = WB::NoBreak; // WB7a
}
break;
}
cls = ncls;
if (action == WB::Break) {
attributes[pos].wordBreak = true;
if (currentWordType != WordTypeNone)
attributes[pos].wordEnd = true;
switch (cls) {
case QUnicodeTables::WordBreak_Katakana:
currentWordType = WordTypeHiraganaKatakana;
attributes[pos].wordStart = true;
break;
case QUnicodeTables::WordBreak_HebrewLetter:
case QUnicodeTables::WordBreak_ALetter:
case QUnicodeTables::WordBreak_Numeric:
currentWordType = WordTypeAlphaNumeric;
attributes[pos].wordStart = true;
break;
default:
currentWordType = WordTypeNone;
break;
}
}
}
if (currentWordType != WordTypeNone)
attributes[len].wordEnd = true;
attributes[len].wordBreak = true; // WB2
}
namespace SB {
enum State {
Initial,
Lower,
Upper,
LUATerm,
ATerm,
ATermC,
ACS,
STerm,
STermC,
SCS,
BAfterC,
BAfter,
Break,
Lookup
};
static const uchar breakTable[BAfter + 1][QUnicodeTables::NumSentenceBreakClasses] = {
// Any CR LF Sep Extend Sp Lower Upper OLetter Numeric ATerm SContinue STerm Close
{ Initial, BAfterC, BAfter , BAfter , Initial, Initial, Lower , Upper , Initial, Initial, ATerm , Initial, STerm , Initial }, // Initial
{ Initial, BAfterC, BAfter , BAfter , Lower , Initial, Initial, Initial, Initial, Initial, LUATerm, Initial, STerm , Initial }, // Lower
{ Initial, BAfterC, BAfter , BAfter , Upper , Initial, Initial, Upper , Initial, Initial, LUATerm, Initial, STerm , Initial }, // Upper
{ Lookup , BAfterC, BAfter , BAfter , LUATerm, ACS , Initial, Upper , Break , Initial, ATerm , STerm , STerm , ATermC }, // LUATerm
{ Lookup , BAfterC, BAfter , BAfter , ATerm , ACS , Initial, Break , Break , Initial, ATerm , STerm , STerm , ATermC }, // ATerm
{ Lookup , BAfterC, BAfter , BAfter , ATermC , ACS , Initial, Break , Break , Lookup , ATerm , STerm , STerm , ATermC }, // ATermC
{ Lookup , BAfterC, BAfter , BAfter , ACS , ACS , Initial, Break , Break , Lookup , ATerm , STerm , STerm , Lookup }, // ACS
{ Break , BAfterC, BAfter , BAfter , STerm , SCS , Break , Break , Break , Break , ATerm , STerm , STerm , STermC }, // STerm,
{ Break , BAfterC, BAfter , BAfter , STermC , SCS , Break , Break , Break , Break , ATerm , STerm , STerm , STermC }, // STermC
{ Break , BAfterC, BAfter , BAfter , SCS , SCS , Break , Break , Break , Break , ATerm , STerm , STerm , Break }, // SCS
{ Break , Break , BAfter , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // BAfterC
{ Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break , Break }, // BAfter
};
} // namespace SB
static void getSentenceBreaks(const char16_t *string, qsizetype len, QCharAttributes *attributes)
{
uchar state = SB::BAfter; // to meet SB1
for (qsizetype i = 0; i != len; ++i) {
qsizetype pos = i;
char32_t ucs4 = string[i];
if (QChar::isHighSurrogate(ucs4) && i + 1 != len) {
ushort low = string[i + 1];
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++i;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::SentenceBreakClass ncls = (QUnicodeTables::SentenceBreakClass) prop->sentenceBreakClass;
Q_ASSERT(state <= SB::BAfter);
state = SB::breakTable[state][ncls];
if (Q_UNLIKELY(state == SB::Lookup)) { // SB8
state = SB::Break;
for (qsizetype lookahead = i + 1; lookahead < len; ++lookahead) {
ucs4 = string[lookahead];
if (QChar::isHighSurrogate(ucs4) && lookahead + 1 != len) {
ushort low = string[lookahead + 1];
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++lookahead;
}
}
prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::SentenceBreakClass tcls = (QUnicodeTables::SentenceBreakClass) prop->sentenceBreakClass;
switch (tcls) {
case QUnicodeTables::SentenceBreak_Any:
case QUnicodeTables::SentenceBreak_Extend:
case QUnicodeTables::SentenceBreak_Sp:
case QUnicodeTables::SentenceBreak_Numeric:
case QUnicodeTables::SentenceBreak_SContinue:
case QUnicodeTables::SentenceBreak_Close:
continue;
case QUnicodeTables::SentenceBreak_Lower:
i = lookahead;
state = SB::Initial;
break;
default:
break;
}
break;
}
}
if (Q_UNLIKELY(state == SB::Break)) {
attributes[pos].sentenceBoundary = true;
state = SB::breakTable[SB::Initial][ncls];
}
}
attributes[len].sentenceBoundary = true; // SB2
}
// -----------------------------------------------------------------------------------------------------
//
// The line breaking algorithm.
// See http://www.unicode.org/reports/tr14/tr14-39.html
//
// -----------------------------------------------------------------------------------------------------
namespace LB {
namespace NS { // Number Sequence
// LB25 recommends to not break lines inside numbers of the form
// described by the following regular expression:
// (PR|PO)?(OP|HY)?NU(NU|SY|IS)*(CL|CP)?(PR|PO)?
enum Action {
None,
Start,
Continue,
Break
};
enum Class {
XX,
PRPO,
OPHY,
NU,
SYIS,
CLCP
};
static const uchar actionTable[CLCP + 1][CLCP + 1] = {
// XX PRPO OPHY NU SYIS CLCP
{ None , Start , Start , Start , None , None }, // XX
{ None , Start , Continue, Continue, None , None }, // PRPO
{ None , Start , Start , Continue, None , None }, // OPHY
{ Break , Break , Break , Continue, Continue, Continue }, // NU
{ Break , Break , Break , Continue, Continue, Continue }, // SYIS
{ Break , Continue, Break , Break , Break , Break }, // CLCP
};
inline Class toClass(QUnicodeTables::LineBreakClass lbc, QChar::Category category)
{
switch (lbc) {
case QUnicodeTables::LineBreak_AL:// case QUnicodeTables::LineBreak_AI:
// resolve AI math symbols in numerical context to IS
if (category == QChar::Symbol_Math)
return SYIS;
break;
case QUnicodeTables::LineBreak_PR: case QUnicodeTables::LineBreak_PO:
return PRPO;
case QUnicodeTables::LineBreak_OP: case QUnicodeTables::LineBreak_HY:
return OPHY;
case QUnicodeTables::LineBreak_NU:
return NU;
case QUnicodeTables::LineBreak_SY: case QUnicodeTables::LineBreak_IS:
return SYIS;
case QUnicodeTables::LineBreak_CL: case QUnicodeTables::LineBreak_CP:
return CLCP;
default:
break;
}
return XX;
}
} // namespace NS
/* In order to support the tailored implementation of LB25 properly
the following changes were made in the pair table to allow breaks
where the numeric expression doesn't match the template (i.e. [^NU](IS|SY)NU):
(CL)(PO) from IB to DB
(CP)(PO) from IB to DB
(CL)(PR) from IB to DB
(CP)(PR) from IB to DB
(PO)(OP) from IB to DB
(PR)(OP) from IB to DB
(IS)(NU) from IB to DB
(SY)(NU) from IB to DB
*/
/* In order to implementat LB21a properly a special rule HH has been introduced and
the following changes were made in the pair table to disallow breaks after Hebrew + Hyphen:
(HL)(HY|BA) from IB to CI
(HY|BA)(!CB) from DB to HH
*/
enum Action {
ProhibitedBreak, PB = ProhibitedBreak,
DirectBreak, DB = DirectBreak,
IndirectBreak, IB = IndirectBreak,
CombiningIndirectBreak, CI = CombiningIndirectBreak,
CombiningProhibitedBreak, CP = CombiningProhibitedBreak,
ProhibitedBreakAfterHebrewPlusHyphen, HH = ProhibitedBreakAfterHebrewPlusHyphen
};
static const uchar breakTable[QUnicodeTables::LineBreak_SA][QUnicodeTables::LineBreak_SA] = {
/* OP CL CP QU GL NS EX SY IS PR PO NU AL HL ID IN HY BA BB B2 ZW CM WJ H2 H3 JL JV JT RI CB EB EM ZWJ*/
/* OP */ { PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, CP, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB },
/* CL */ { DB, PB, PB, IB, IB, PB, PB, PB, PB, DB, DB, DB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* CP */ { DB, PB, PB, IB, IB, PB, PB, PB, PB, DB, DB, IB, IB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* QU */ { PB, PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, PB, CI, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB },
/* GL */ { IB, PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, PB, CI, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB },
/* NS */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* EX */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* SY */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* IS */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, IB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* PR */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, IB, IB, IB, IB, DB, IB, IB, DB, DB, PB, CI, PB, IB, IB, IB, IB, IB, DB, DB, IB, IB, IB },
/* PO */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, IB, IB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* NU */ { IB, PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* AL */ { IB, PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* HL */ { IB, PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, DB, IB, CI, CI, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* ID */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* IN */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* HY */ { HH, PB, PB, IB, HH, IB, PB, PB, PB, HH, HH, IB, HH, HH, HH, HH, IB, IB, HH, HH, PB, CI, PB, HH, HH, HH, HH, HH, HH, DB, DB, DB, IB },
/* BA */ { HH, PB, PB, IB, HH, IB, PB, PB, PB, HH, HH, HH, HH, HH, HH, HH, IB, IB, HH, HH, PB, CI, PB, HH, HH, HH, HH, HH, HH, DB, DB, DB, IB },
/* BB */ { IB, PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, PB, CI, PB, IB, IB, IB, IB, IB, IB, DB, IB, IB, IB },
/* B2 */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, DB, IB, IB, DB, PB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* ZW */ { DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB },
/* CM */ { IB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, IB, IB, IB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* WJ */ { IB, PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, PB, CI, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB },
/* H2 */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, IB, IB, DB, DB, DB, DB, IB },
/* H3 */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, IB, DB, DB, DB, DB, IB },
/* JL */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, IB, IB, IB, IB, DB, DB, DB, DB, DB, IB },
/* JV */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, IB, IB, DB, DB, DB, DB, IB },
/* JT */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, IB, DB, DB, DB, DB, IB },
/* RI */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, IB, DB, DB, DB, IB },
/* CB */ { DB, PB, PB, IB, IB, DB, PB, PB, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* EB */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, IB, IB },
/* EM */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, DB, DB, IB },
/* ZWJ*/ { IB, PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB, DB, DB, IB, IB, IB }
};
// The following line break classes are not treated by the pair table
// and must be resolved outside:
// AI, BK, CB, CJ, CR, LF, NL, SA, SG, SP, XX
} // namespace LB
static void getLineBreaks(const char16_t *string, qsizetype len, QCharAttributes *attributes, QUnicodeTools::CharAttributeOptions options)
{
qsizetype nestart = 0;
LB::NS::Class nelast = LB::NS::XX;
QUnicodeTables::LineBreakClass lcls = QUnicodeTables::LineBreak_LF; // to meet LB10
QUnicodeTables::LineBreakClass cls = lcls;
for (qsizetype i = 0; i != len; ++i) {
qsizetype pos = i;
char32_t ucs4 = string[i];
if (QChar::isHighSurrogate(ucs4) && i + 1 != len) {
ushort low = string[i + 1];
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++i;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::LineBreakClass ncls = (QUnicodeTables::LineBreakClass) prop->lineBreakClass;
QUnicodeTables::LineBreakClass tcls;
if (options & QUnicodeTools::HangulLineBreakTailoring) {
if (Q_UNLIKELY((ncls >= QUnicodeTables::LineBreak_H2
&& ncls <= QUnicodeTables::LineBreak_JT)
|| (ucs4 >= 0x3130 && ucs4 <= 0x318F && ncls == QUnicodeTables::LineBreak_ID))
) {
// LB27: use SPACE for line breaking
// "When Korean uses SPACE for line breaking, the classes in rule LB26,
// as well as characters of class ID, are often tailored to AL; see Section 8, Customization."
// In case of Korean syllables: "3130..318F HANGUL COMPATIBILITY JAMO"
ncls = QUnicodeTables::LineBreak_AL;
} else {
if (Q_UNLIKELY(ncls == QUnicodeTables::LineBreak_SA)) {
// LB1: resolve SA to AL, except of those that have Category Mn or Mc be resolved to CM
static const int test = FLAG(QChar::Mark_NonSpacing) | FLAG(QChar::Mark_SpacingCombining);
if (FLAG(prop->category) & test)
ncls = QUnicodeTables::LineBreak_CM;
}
if (Q_UNLIKELY(ncls == QUnicodeTables::LineBreak_CM)) {
// LB10: treat CM that follows SP, BK, CR, LF, NL, or ZW as AL
if (lcls == QUnicodeTables::LineBreak_ZW || lcls >= QUnicodeTables::LineBreak_SP)
ncls = QUnicodeTables::LineBreak_AL;
}
}
}
if (Q_UNLIKELY(ncls == QUnicodeTables::LineBreak_SA)) {
// LB1: resolve SA to AL, except of those that have Category Mn or Mc be resolved to CM
static const int test = FLAG(QChar::Mark_NonSpacing) | FLAG(QChar::Mark_SpacingCombining);
if (FLAG(prop->category) & test)
ncls = QUnicodeTables::LineBreak_CM;
}
if (Q_UNLIKELY(lcls >= QUnicodeTables::LineBreak_CR)) {
// LB4: BK!, LB5: (CRxLF|CR|LF|NL)!
if (lcls > QUnicodeTables::LineBreak_CR || ncls != QUnicodeTables::LineBreak_LF)
attributes[pos].lineBreak = attributes[pos].mandatoryBreak = true;
if (Q_UNLIKELY(ncls == QUnicodeTables::LineBreak_CM || ncls == QUnicodeTables::LineBreak_ZWJ)) {
cls = QUnicodeTables::LineBreak_AL;
goto next_no_cls_update;
}
goto next;
}
if (Q_UNLIKELY(ncls >= QUnicodeTables::LineBreak_SP)) {
if (ncls > QUnicodeTables::LineBreak_SP)
goto next; // LB6: x(BK|CR|LF|NL)
goto next_no_cls_update; // LB7: xSP
}
if (Q_UNLIKELY(ncls == QUnicodeTables::LineBreak_CM || ncls == QUnicodeTables::LineBreak_ZWJ)) {
// LB9: treat CM that don't follows SP, BK, CR, LF, NL, or ZW as X
if (lcls != QUnicodeTables::LineBreak_ZW && lcls < QUnicodeTables::LineBreak_SP)
// don't update anything
goto next_no_cls_update;
}
if (Q_UNLIKELY(lcls == QUnicodeTables::LineBreak_ZWJ)) {
// LB8a: ZWJ x (ID | EB | EM)
if (ncls == QUnicodeTables::LineBreak_ID || ncls == QUnicodeTables::LineBreak_EB || ncls == QUnicodeTables::LineBreak_EM)
goto next;
}
// LB25: do not break lines inside numbers
{
LB::NS::Class necur = LB::NS::toClass(ncls, (QChar::Category)prop->category);
switch (LB::NS::actionTable[nelast][necur]) {
case LB::NS::Break:
// do not change breaks before and after the expression
for (qsizetype j = nestart + 1; j < pos; ++j)
attributes[j].lineBreak = false;
Q_FALLTHROUGH();
case LB::NS::None:
nelast = LB::NS::XX; // reset state
break;
case LB::NS::Start:
nestart = i;
Q_FALLTHROUGH();
default:
nelast = necur;
break;
}
}
if (Q_UNLIKELY(ncls == QUnicodeTables::LineBreak_RI && lcls == QUnicodeTables::LineBreak_RI)) {
// LB30a
ncls = QUnicodeTables::LineBreak_SP;
goto next;
}
// for South East Asian chars that require a complex analysis, the Unicode
// standard recommends to treat them as AL. tailoring that do dictionary analysis can override
if (Q_UNLIKELY(cls >= QUnicodeTables::LineBreak_SA))
cls = QUnicodeTables::LineBreak_AL;
tcls = cls;
if (tcls == QUnicodeTables::LineBreak_CM)
// LB10
tcls = QUnicodeTables::LineBreak_AL;
switch (LB::breakTable[tcls][ncls < QUnicodeTables::LineBreak_SA ? ncls : QUnicodeTables::LineBreak_AL]) {
case LB::DirectBreak:
attributes[pos].lineBreak = true;
break;
case LB::IndirectBreak:
if (lcls == QUnicodeTables::LineBreak_SP)
attributes[pos].lineBreak = true;
break;
case LB::CombiningIndirectBreak:
if (lcls != QUnicodeTables::LineBreak_SP)
goto next_no_cls_update;
attributes[pos].lineBreak = true;
break;
case LB::CombiningProhibitedBreak:
if (lcls != QUnicodeTables::LineBreak_SP)
goto next_no_cls_update;
break;
case LB::ProhibitedBreakAfterHebrewPlusHyphen:
if (lcls != QUnicodeTables::LineBreak_HL)
attributes[pos].lineBreak = true;
break;
case LB::ProhibitedBreak:
// nothing to do
default:
break;
}
next:
cls = ncls;
next_no_cls_update:
lcls = ncls;
}
if (Q_UNLIKELY(LB::NS::actionTable[nelast][LB::NS::XX] == LB::NS::Break)) {
// LB25: do not break lines inside numbers
for (qsizetype j = nestart + 1; j < len; ++j)
attributes[j].lineBreak = false;
}
attributes[0].lineBreak = attributes[0].mandatoryBreak = false; // LB2
attributes[len].lineBreak = attributes[len].mandatoryBreak = true; // LB3
}
static void getWhiteSpaces(const char16_t *string, qsizetype len, QCharAttributes *attributes)
{
for (qsizetype i = 0; i != len; ++i) {
uint ucs4 = string[i];
if (QChar::isHighSurrogate(ucs4) && i + 1 != len) {
ushort low = string[i + 1];
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++i;
}
}
if (Q_UNLIKELY(QChar::isSpace(ucs4)))
attributes[i].whiteSpace = true;
}
}
namespace Tailored {
using CharAttributeFunction = void (*)(QChar::Script script, const char16_t *text, qsizetype from, qsizetype len, QCharAttributes *attributes);
enum Form {
Invalid = 0x0,
UnknownForm = Invalid,
Consonant,
Nukta,
Halant,
Matra,
VowelMark,
StressMark,
IndependentVowel,
LengthMark,
Control,
Other
};
static const unsigned char indicForms[0xe00-0x900] = {
// Devangari
Invalid, VowelMark, VowelMark, VowelMark,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, UnknownForm, UnknownForm,
Nukta, Other, Matra, Matra,
Matra, Matra, Matra, Matra,
Matra, Matra, Matra, Matra,
Matra, Matra, Matra, Matra,
Matra, Halant, UnknownForm, UnknownForm,
Other, StressMark, StressMark, StressMark,
StressMark, UnknownForm, UnknownForm, UnknownForm,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
IndependentVowel, IndependentVowel, VowelMark, VowelMark,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Consonant,
Consonant, Consonant /* ??? */, Consonant, Consonant,
// Bengali
Invalid, VowelMark, VowelMark, VowelMark,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, Invalid, IndependentVowel,
IndependentVowel, Invalid, Invalid, IndependentVowel,
IndependentVowel, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Invalid,
Invalid, Invalid, Consonant, Consonant,
Consonant, Consonant, UnknownForm, UnknownForm,
Nukta, Other, Matra, Matra,
Matra, Matra, Matra, Matra,
Matra, Invalid, Invalid, Matra,
Matra, Invalid, Invalid, Matra,
Matra, Halant, Consonant, UnknownForm,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, VowelMark,
Invalid, Invalid, Invalid, Invalid,
Consonant, Consonant, Invalid, Consonant,
IndependentVowel, IndependentVowel, VowelMark, VowelMark,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Consonant, Consonant, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
// Gurmukhi
Invalid, VowelMark, VowelMark, VowelMark,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, Invalid,
Invalid, Invalid, Invalid, IndependentVowel,
IndependentVowel, Invalid, Invalid, IndependentVowel,
IndependentVowel, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Invalid, Consonant, Consonant, Invalid,
Consonant, Consonant, UnknownForm, UnknownForm,
Nukta, Other, Matra, Matra,
Matra, Matra, Matra, Invalid,
Invalid, Invalid, Invalid, Matra,
Matra, Invalid, Invalid, Matra,
Matra, Halant, UnknownForm, UnknownForm,
Invalid, Invalid, Invalid, Invalid,
Invalid, UnknownForm, UnknownForm, UnknownForm,
Invalid, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Invalid,
Other, Other, Invalid, Invalid,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
StressMark, StressMark, Consonant, Consonant,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
// Gujarati
Invalid, VowelMark, VowelMark, VowelMark,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, Invalid, IndependentVowel,
IndependentVowel, IndependentVowel, Invalid, IndependentVowel,
IndependentVowel, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Invalid, Consonant, Consonant, Consonant,
Consonant, Consonant, UnknownForm, UnknownForm,
Nukta, Other, Matra, Matra,
Matra, Matra, Matra, Matra,
Matra, Matra, Invalid, Matra,
Matra, Matra, Invalid, Matra,
Matra, Halant, UnknownForm, UnknownForm,
Other, UnknownForm, UnknownForm, UnknownForm,
UnknownForm, UnknownForm, UnknownForm, UnknownForm,
UnknownForm, UnknownForm, UnknownForm, UnknownForm,
UnknownForm, UnknownForm, UnknownForm, UnknownForm,
IndependentVowel, IndependentVowel, VowelMark, VowelMark,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
// Oriya
Invalid, VowelMark, VowelMark, VowelMark,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, Invalid, IndependentVowel,
IndependentVowel, Invalid, Invalid, IndependentVowel,
IndependentVowel, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Invalid, Consonant, Consonant, Consonant,
Consonant, Consonant, UnknownForm, UnknownForm,
Nukta, Other, Matra, Matra,
Matra, Matra, Matra, Matra,
Invalid, Invalid, Invalid, Matra,
Matra, Invalid, Invalid, Matra,
Matra, Halant, UnknownForm, UnknownForm,
Other, Invalid, Invalid, Invalid,
Invalid, UnknownForm, LengthMark, LengthMark,
Invalid, Invalid, Invalid, Invalid,
Consonant, Consonant, Invalid, Consonant,
IndependentVowel, IndependentVowel, Invalid, Invalid,
Invalid, Invalid, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Consonant, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
//Tamil
Invalid, Invalid, VowelMark, Other,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, Invalid,
Invalid, Invalid, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, IndependentVowel, IndependentVowel,
IndependentVowel, Consonant, Invalid, Invalid,
Invalid, Consonant, Consonant, Invalid,
Consonant, Invalid, Consonant, Consonant,
Invalid, Invalid, Invalid, Consonant,
Consonant, Invalid, Invalid, Invalid,
Consonant, Consonant, Consonant, Invalid,
Invalid, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, UnknownForm, UnknownForm,
Invalid, Invalid, Matra, Matra,
Matra, Matra, Matra, Invalid,
Invalid, Invalid, Matra, Matra,
Matra, Invalid, Matra, Matra,
Matra, Halant, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, LengthMark,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
// Telugu
Invalid, VowelMark, VowelMark, VowelMark,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, IndependentVowel, IndependentVowel,
IndependentVowel, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Invalid, Consonant, Consonant, Consonant,
Consonant, Consonant, UnknownForm, UnknownForm,
Invalid, Invalid, Matra, Matra,
Matra, Matra, Matra, Matra,
Matra, Invalid, Matra, Matra,
Matra, Invalid, Matra, Matra,
Matra, Halant, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, LengthMark, Matra, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
IndependentVowel, IndependentVowel, Invalid, Invalid,
Invalid, Invalid, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
// Kannada
Invalid, Invalid, VowelMark, VowelMark,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, IndependentVowel, IndependentVowel,
IndependentVowel, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Invalid, Consonant, Consonant, Consonant,
Consonant, Consonant, UnknownForm, UnknownForm,
Nukta, Other, Matra, Matra,
Matra, Matra, Matra, Matra,
Matra, Invalid, Matra, Matra,
Matra, Invalid, Matra, Matra,
Matra, Halant, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, LengthMark, LengthMark, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Consonant, Invalid,
IndependentVowel, IndependentVowel, VowelMark, VowelMark,
Invalid, Invalid, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
// Malayalam
Invalid, Invalid, VowelMark, VowelMark,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, IndependentVowel, IndependentVowel,
IndependentVowel, Invalid, IndependentVowel, IndependentVowel,
IndependentVowel, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, UnknownForm, UnknownForm,
Invalid, Invalid, Matra, Matra,
Matra, Matra, Matra, Matra,
Invalid, Invalid, Matra, Matra,
Matra, Invalid, Matra, Matra,
Matra, Halant, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, Matra,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
IndependentVowel, IndependentVowel, Invalid, Invalid,
Invalid, Invalid, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
// Sinhala
Invalid, Invalid, VowelMark, VowelMark,
Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
IndependentVowel, IndependentVowel, IndependentVowel, Invalid,
Invalid, Invalid, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Invalid, Consonant,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Consonant,
Invalid, Consonant, Invalid, Invalid,
Consonant, Consonant, Consonant, Consonant,
Consonant, Consonant, Consonant, Invalid,
Invalid, Invalid, Halant, Invalid,
Invalid, Invalid, Invalid, Matra,
Matra, Matra, Matra, Matra,
Matra, Invalid, Matra, Invalid,
Matra, Matra, Matra, Matra,
Matra, Matra, Matra, Matra,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Invalid, Invalid,
Invalid, Invalid, Matra, Matra,
Other, Other, Other, Other,
Other, Other, Other, Other,
Other, Other, Other, Other,
};
static inline Form form(unsigned short uc) {
if (uc < 0x900 || uc > 0xdff) {
if (uc == 0x25cc)
return Consonant;
if (uc == 0x200c || uc == 0x200d)
return Control;
return Other;
}
return (Form)indicForms[uc-0x900];
}
// #define INDIC_DEBUG
#ifdef INDIC_DEBUG
#define IDEBUG qDebug
#else
#define IDEBUG if constexpr (1) ; else qDebug
#endif
/* syllables are of the form:
(Consonant Nukta? Halant)* Consonant Matra? VowelMark? StressMark?
(Consonant Nukta? Halant)* Consonant Halant
IndependentVowel VowelMark? StressMark?
We return syllable boundaries on invalid combinations aswell
*/
static qsizetype indic_nextSyllableBoundary(QChar::Script script, const char16_t *s, qsizetype start, qsizetype end, bool *invalid)
{
*invalid = false;
IDEBUG("indic_nextSyllableBoundary: start=%d, end=%d", int(start), int(end));
const char16_t *uc = s+start;
qsizetype pos = 0;
Form state = form(uc[pos]);
IDEBUG("state[%d]=%d (uc=%4x)", int(pos), state, uc[pos]);
pos++;
if (state != Consonant && state != IndependentVowel) {
if (state != Other)
*invalid = true;
goto finish;
}
while (pos < end - start) {
Form newState = form(uc[pos]);
IDEBUG("state[%d]=%d (uc=%4x)", int(pos), newState, uc[pos]);
switch (newState) {
case Control:
newState = state;
if (state == Halant && uc[pos] == 0x200d /* ZWJ */)
break;
// the control character should be the last char in the item
if (state == Consonant && script == QChar::Script_Bengali && uc[pos-1] == 0x09B0 && uc[pos] == 0x200d /* ZWJ */)
break;
if (state == Consonant && script == QChar::Script_Kannada && uc[pos-1] == 0x0CB0 && uc[pos] == 0x200d /* ZWJ */)
break;
// Bengali and Kannada has a special exception for rendering yaphala with ra (to avoid reph) see http://www.unicode.org/faq/indic.html#15
++pos;
goto finish;
case Consonant:
if (state == Halant && (script != QChar::Script_Sinhala || uc[pos-1] == 0x200d /* ZWJ */))
break;
goto finish;
case Halant:
if (state == Nukta || state == Consonant)
break;
// Bengali has a special exception allowing the combination Vowel_A/E + Halant + Ya
if (script == QChar::Script_Bengali && pos == 1 &&
(uc[0] == 0x0985 || uc[0] == 0x098f))
break;
// Sinhala uses the Halant as a component of certain matras. Allow these, but keep the state on Matra.
if (script == QChar::Script_Sinhala && state == Matra) {
++pos;
continue;
}
if (script == QChar::Script_Malayalam && state == Matra && uc[pos-1] == 0x0d41) {
++pos;
continue;
}
goto finish;
case Nukta:
if (state == Consonant)
break;
goto finish;
case StressMark:
if (state == VowelMark)
break;
Q_FALLTHROUGH();
case VowelMark:
if (state == Matra || state == LengthMark || state == IndependentVowel)
break;
Q_FALLTHROUGH();
case Matra:
if (state == Consonant || state == Nukta)
break;
if (state == Matra) {
// ### needs proper testing for correct two/three part matras
break;
}
// ### not sure if this is correct. If it is, does it apply only to Bengali or should
// it work for all Indic languages?
// the combination Independent_A + Vowel Sign AA is allowed.
if (script == QChar::Script_Bengali && uc[pos] == 0x9be && uc[pos-1] == 0x985)
break;
if (script == QChar::Script_Tamil && state == Matra) {
if (uc[pos-1] == 0x0bc6 &&
(uc[pos] == 0xbbe || uc[pos] == 0xbd7))
break;
if (uc[pos-1] == 0x0bc7 && uc[pos] == 0xbbe)
break;
}
goto finish;
case LengthMark:
if (state == Matra) {
// ### needs proper testing for correct two/three part matras
break;
}
case IndependentVowel:
case Invalid:
case Other:
goto finish;
}
state = newState;
pos++;
}
finish:
return pos+start;
}
static void indicAttributes(QChar::Script script, const char16_t *text, qsizetype from, qsizetype len, QCharAttributes *attributes)
{
qsizetype end = from + len;
const char16_t *uc = text + from;
attributes += from;
qsizetype i = 0;
while (i < len) {
bool invalid;
qsizetype boundary = indic_nextSyllableBoundary(script, text, from+i, end, &invalid) - from;
attributes[i].graphemeBoundary = true;
if (boundary > len-1) boundary = len;
i++;
while (i < boundary) {
attributes[i].graphemeBoundary = false;
++uc;
++i;
}
assert(i == boundary);
}
}
#define LIBTHAI_MAJOR 0
/*
* if libthai changed please update these codes too.
*/
struct thcell_t {
unsigned char base; /**< base character */
unsigned char hilo; /**< upper/lower vowel/diacritic */
unsigned char top; /**< top-level mark */
};
typedef int (*th_brk_def) (const unsigned char*, int*, size_t);
typedef size_t (*th_next_cell_def) (const unsigned char *, size_t, struct thcell_t *, int);
/* libthai related function handles */
static th_brk_def th_brk = nullptr;
static th_next_cell_def th_next_cell = nullptr;
static int init_libthai() {
#if QT_CONFIG(library)
static bool initialized = false;
if (!initialized && (!th_brk || !th_next_cell)) {
th_brk = reinterpret_cast<th_brk_def>(QLibrary::resolve(QLatin1String("thai"), static_cast<int>(LIBTHAI_MAJOR), "th_brk"));
th_next_cell = (th_next_cell_def)QLibrary::resolve(QLatin1String("thai"), LIBTHAI_MAJOR, "th_next_cell");
initialized = true;
}
if (th_brk && th_next_cell)
return 1;
else
#endif
return 0;
}
static void to_tis620(const char16_t *string, qsizetype len, char *cstr)
{
qsizetype i;
unsigned char *result = reinterpret_cast<unsigned char *>(cstr);
for (i = 0; i < len; ++i) {
if (string[i] <= 0xa0)
result[i] = static_cast<unsigned char>(string[i]);
else if (string[i] >= 0xe01 && string[i] <= 0xe5b)
result[i] = static_cast<unsigned char>(string[i] - 0xe00 + 0xa0);
else
result[i] = static_cast<unsigned char>(~0); // Same encoding as libthai uses for invalid chars
}
result[len] = 0;
}
/*
* Thai Attributes: computes Word Break, Word Boundary and Char stop for THAI.
*/
static void thaiAssignAttributes(const char16_t *string, qsizetype len, QCharAttributes *attributes)
{
char s[128];
char *cstr = s;
int *break_positions = nullptr;
int brp[128];
int brp_size = 0;
qsizetype numbreaks, i, j, cell_length;
struct thcell_t tis_cell;
if (!init_libthai())
return ;
if (len >= 128)
cstr = static_cast<char *>(malloc (len * sizeof(char) + 1));
to_tis620(string, len, cstr);
for (i = 0; i < len; ++i) {
attributes[i].wordBreak = false;
attributes[i].wordStart = false;
attributes[i].wordEnd = false;
attributes[i].lineBreak = false;
}
if (len > 128) {
break_positions = static_cast<int *>(malloc (sizeof(int) * len));
memset (break_positions, 0, sizeof(int) * len);
brp_size = len;
}
else {
break_positions = brp;
brp_size = 128;
}
if (break_positions) {
attributes[0].wordBreak = true;
attributes[0].wordStart = true;
attributes[0].wordEnd = false;
numbreaks = th_brk(reinterpret_cast<const unsigned char *>(cstr), break_positions, brp_size);
for (i = 0; i < numbreaks; ++i) {
attributes[break_positions[i]].wordBreak = true;
attributes[break_positions[i]].wordStart = true;
attributes[break_positions[i]].wordEnd = true;
attributes[break_positions[i]].lineBreak = true;
}
if (numbreaks > 0)
attributes[break_positions[numbreaks - 1]].wordStart = false;
if (break_positions != brp)
free(break_positions);
}
/* manage grapheme boundaries */
i = 0;
while (i < len) {
cell_length = static_cast<uint>(th_next_cell(reinterpret_cast<const unsigned char *>(cstr) + i, len - i, &tis_cell, true));
attributes[i].graphemeBoundary = true;
for (j = 1; j < cell_length; j++)
attributes[i + j].graphemeBoundary = false;
/* Set graphemeBoundary for SARA AM */
if (cstr[i + cell_length - 1] == static_cast<char>(0xd3))
attributes[i + cell_length - 1].graphemeBoundary = true;
i += cell_length;
}
if (len >= 128)
free(cstr);
}
static void thaiAttributes(QChar::Script script, const char16_t *text, qsizetype from, qsizetype len, QCharAttributes *attributes)
{
assert(script == QChar::Script_Thai);
const char16_t *uc = text + from;
attributes += from;
Q_UNUSED(script);
thaiAssignAttributes(uc, len, attributes);
}
/*
tibetan syllables are of the form:
head position consonant
first sub-joined consonant
....intermediate sub-joined consonants (if any)
last sub-joined consonant
sub-joined vowel (a-chung U+0F71)
standard or compound vowel sign (or 'virama' for devanagari transliteration)
*/
typedef enum {
TibetanOther,
TibetanHeadConsonant,
TibetanSubjoinedConsonant,
TibetanSubjoinedVowel,
TibetanVowel
} TibetanForm;
/* this table starts at U+0f40 */
static const unsigned char tibetanForm[0x80] = {
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
TibetanOther, TibetanOther, TibetanOther, TibetanOther,
TibetanOther, TibetanVowel, TibetanVowel, TibetanVowel,
TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
TibetanOther, TibetanOther, TibetanOther, TibetanOther,
TibetanOther, TibetanOther, TibetanOther, TibetanOther,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
TibetanSubjoinedConsonant, TibetanOther, TibetanOther, TibetanOther
};
#define tibetan_form(c) \
((c) >= 0x0f40 && (c) < 0x0fc0 ? (TibetanForm)tibetanForm[(c) - 0x0f40] : TibetanOther)
static qsizetype tibetan_nextSyllableBoundary(const char16_t *s, qsizetype start, qsizetype end, bool *invalid)
{
const char16_t *uc = s + start;
qsizetype pos = 0;
TibetanForm state = tibetan_form(*uc);
/* qDebug("state[%d]=%d (uc=%4x)", pos, state, uc[pos]);*/
pos++;
if (state != TibetanHeadConsonant) {
if (state != TibetanOther)
*invalid = true;
goto finish;
}
while (pos < end - start) {
TibetanForm newState = tibetan_form(uc[pos]);
switch (newState) {
case TibetanSubjoinedConsonant:
case TibetanSubjoinedVowel:
if (state != TibetanHeadConsonant &&
state != TibetanSubjoinedConsonant)
goto finish;
state = newState;
break;
case TibetanVowel:
if (state != TibetanHeadConsonant &&
state != TibetanSubjoinedConsonant &&
state != TibetanSubjoinedVowel)
goto finish;
break;
case TibetanOther:
case TibetanHeadConsonant:
goto finish;
}
pos++;
}
finish:
*invalid = false;
return start+pos;
}
static void tibetanAttributes(QChar::Script script, const char16_t *text, qsizetype from, qsizetype len, QCharAttributes *attributes)
{
qsizetype end = from + len;
const char16_t *uc = text + from;
qsizetype i = 0;
Q_UNUSED(script);
attributes += from;
while (i < len) {
bool invalid;
qsizetype boundary = tibetan_nextSyllableBoundary(text, from+i, end, &invalid) - from;
attributes[i].graphemeBoundary = true;
if (boundary > len-1) boundary = len;
i++;
while (i < boundary) {
attributes[i].graphemeBoundary = false;
++uc;
++i;
}
assert(i == boundary);
}
}
enum MymrCharClassValues {
Mymr_CC_RESERVED = 0,
Mymr_CC_CONSONANT = 1, /* Consonant of type 1, that has subscript form */
Mymr_CC_CONSONANT2 = 2, /* Consonant of type 2, that has no subscript form */
Mymr_CC_NGA = 3, /* Consonant NGA */
Mymr_CC_YA = 4, /* Consonant YA */
Mymr_CC_RA = 5, /* Consonant RA */
Mymr_CC_WA = 6, /* Consonant WA */
Mymr_CC_HA = 7, /* Consonant HA */
Mymr_CC_IND_VOWEL = 8, /* Independent vowel */
Mymr_CC_ZERO_WIDTH_NJ_MARK = 9, /* Zero Width non joiner character (0x200C) */
Mymr_CC_VIRAMA = 10, /* Subscript consonant combining character */
Mymr_CC_PRE_VOWEL = 11, /* Dependent vowel, prebase (Vowel e) */
Mymr_CC_BELOW_VOWEL = 12, /* Dependent vowel, prebase (Vowel u, uu) */
Mymr_CC_ABOVE_VOWEL = 13, /* Dependent vowel, prebase (Vowel i, ii, ai) */
Mymr_CC_POST_VOWEL = 14, /* Dependent vowel, prebase (Vowel aa) */
Mymr_CC_SIGN_ABOVE = 15,
Mymr_CC_SIGN_BELOW = 16,
Mymr_CC_SIGN_AFTER = 17,
Mymr_CC_ZERO_WIDTH_J_MARK = 18, /* Zero width joiner character */
Mymr_CC_COUNT = 19 /* This is the number of character classes */
};
enum MymrCharClassFlags {
Mymr_CF_CLASS_MASK = 0x0000FFFF,
Mymr_CF_CONSONANT = 0x01000000, /* flag to speed up comparing */
Mymr_CF_MEDIAL = 0x02000000, /* flag to speed up comparing */
Mymr_CF_IND_VOWEL = 0x04000000, /* flag to speed up comparing */
Mymr_CF_DEP_VOWEL = 0x08000000, /* flag to speed up comparing */
Mymr_CF_DOTTED_CIRCLE = 0x10000000, /* add a dotted circle if a character with this flag is the
first in a syllable */
Mymr_CF_VIRAMA = 0x20000000, /* flag to speed up comparing */
/* position flags */
Mymr_CF_POS_BEFORE = 0x00080000,
Mymr_CF_POS_BELOW = 0x00040000,
Mymr_CF_POS_ABOVE = 0x00020000,
Mymr_CF_POS_AFTER = 0x00010000,
Mymr_CF_POS_MASK = 0x000f0000,
Mymr_CF_AFTER_KINZI = 0x00100000
};
/* Characters that get refrered to by name */
enum MymrChar
{
Mymr_C_SIGN_ZWNJ = 0x200C,
Mymr_C_SIGN_ZWJ = 0x200D,
Mymr_C_DOTTED_CIRCLE = 0x25CC,
Mymr_C_RA = 0x101B,
Mymr_C_YA = 0x101A,
Mymr_C_NGA = 0x1004,
Mymr_C_VOWEL_E = 0x1031,
Mymr_C_VIRAMA = 0x1039
};
enum
{
Mymr_xx = Mymr_CC_RESERVED,
Mymr_c1 = Mymr_CC_CONSONANT | Mymr_CF_CONSONANT | Mymr_CF_POS_BELOW,
Mymr_c2 = Mymr_CC_CONSONANT2 | Mymr_CF_CONSONANT,
Mymr_ng = Mymr_CC_NGA | Mymr_CF_CONSONANT | Mymr_CF_POS_ABOVE,
Mymr_ya = Mymr_CC_YA | Mymr_CF_CONSONANT | Mymr_CF_MEDIAL | Mymr_CF_POS_AFTER | Mymr_CF_AFTER_KINZI,
Mymr_ra = Mymr_CC_RA | Mymr_CF_CONSONANT | Mymr_CF_MEDIAL | Mymr_CF_POS_BEFORE,
Mymr_wa = Mymr_CC_WA | Mymr_CF_CONSONANT | Mymr_CF_MEDIAL | Mymr_CF_POS_BELOW,
Mymr_ha = Mymr_CC_HA | Mymr_CF_CONSONANT | Mymr_CF_MEDIAL | Mymr_CF_POS_BELOW,
Mymr_id = Mymr_CC_IND_VOWEL | Mymr_CF_IND_VOWEL,
Mymr_vi = Mymr_CC_VIRAMA | Mymr_CF_VIRAMA | Mymr_CF_POS_ABOVE | Mymr_CF_DOTTED_CIRCLE,
Mymr_dl = Mymr_CC_PRE_VOWEL | Mymr_CF_DEP_VOWEL | Mymr_CF_POS_BEFORE | Mymr_CF_DOTTED_CIRCLE | Mymr_CF_AFTER_KINZI,
Mymr_db = Mymr_CC_BELOW_VOWEL | Mymr_CF_DEP_VOWEL | Mymr_CF_POS_BELOW | Mymr_CF_DOTTED_CIRCLE | Mymr_CF_AFTER_KINZI,
Mymr_da = Mymr_CC_ABOVE_VOWEL | Mymr_CF_DEP_VOWEL | Mymr_CF_POS_ABOVE | Mymr_CF_DOTTED_CIRCLE | Mymr_CF_AFTER_KINZI,
Mymr_dr = Mymr_CC_POST_VOWEL | Mymr_CF_DEP_VOWEL | Mymr_CF_POS_AFTER | Mymr_CF_DOTTED_CIRCLE | Mymr_CF_AFTER_KINZI,
Mymr_sa = Mymr_CC_SIGN_ABOVE | Mymr_CF_DOTTED_CIRCLE | Mymr_CF_POS_ABOVE | Mymr_CF_AFTER_KINZI,
Mymr_sb = Mymr_CC_SIGN_BELOW | Mymr_CF_DOTTED_CIRCLE | Mymr_CF_POS_BELOW | Mymr_CF_AFTER_KINZI,
Mymr_sp = Mymr_CC_SIGN_AFTER | Mymr_CF_DOTTED_CIRCLE | Mymr_CF_AFTER_KINZI
};
typedef int MymrCharClass;
static const MymrCharClass mymrCharClasses[] =
{
Mymr_c1, Mymr_c1, Mymr_c1, Mymr_c1, Mymr_ng, Mymr_c1, Mymr_c1, Mymr_c1,
Mymr_c1, Mymr_c1, Mymr_c2, Mymr_c1, Mymr_c1, Mymr_c1, Mymr_c1, Mymr_c1, /* 1000 - 100F */
Mymr_c1, Mymr_c1, Mymr_c1, Mymr_c1, Mymr_c1, Mymr_c1, Mymr_c1, Mymr_c1,
Mymr_c1, Mymr_c1, Mymr_ya, Mymr_ra, Mymr_c1, Mymr_wa, Mymr_c1, Mymr_ha, /* 1010 - 101F */
Mymr_c2, Mymr_c2, Mymr_xx, Mymr_id, Mymr_id, Mymr_id, Mymr_id, Mymr_id,
Mymr_xx, Mymr_id, Mymr_id, Mymr_xx, Mymr_dr, Mymr_da, Mymr_da, Mymr_db, /* 1020 - 102F */
Mymr_db, Mymr_dl, Mymr_da, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_sa, Mymr_sb,
Mymr_sp, Mymr_vi, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, /* 1030 - 103F */
Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx,
Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, /* 1040 - 104F */
Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx,
Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, Mymr_xx, /* 1050 - 105F */
};
static MymrCharClass
getMyanmarCharClass (ushort ch)
{
if (ch == Mymr_C_SIGN_ZWJ)
return Mymr_CC_ZERO_WIDTH_J_MARK;
if (ch == Mymr_C_SIGN_ZWNJ)
return Mymr_CC_ZERO_WIDTH_NJ_MARK;
if (ch < 0x1000 || ch > 0x105f)
return Mymr_CC_RESERVED;
return mymrCharClasses[ch - 0x1000];
}
static const signed char mymrStateTable[][Mymr_CC_COUNT] =
{
/* xx c1, c2 ng ya ra wa ha id zwnj vi dl db da dr sa sb sp zwj */
{ 1, 4, 4, 2, 4, 4, 4, 4, 24, 1, 27, 17, 18, 19, 20, 21, 1, 1, 4}, /* 0 - ground state */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 1 - exit state (or sp to the right of the syllable) */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 3, 17, 18, 19, 20, 21, -1, -1, 4}, /* 2 - NGA */
{-1, 4, 4, 4, 4, 4, 4, 4, -1, 23, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 3 - Virama after NGA */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 5, 17, 18, 19, 20, 21, 1, 1, -1}, /* 4 - Base consonant */
{-2, 6, -2, -2, 7, 8, 9, 10, -2, 23, -2, -2, -2, -2, -2, -2, -2, -2, -2}, /* 5 - First virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 25, 17, 18, 19, 20, 21, -1, -1, -1}, /* 6 - c1 after virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 12, 17, 18, 19, 20, 21, -1, -1, -1}, /* 7 - ya after virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 12, 17, 18, 19, 20, 21, -1, -1, -1}, /* 8 - ra after virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 12, 17, 18, 19, 20, 21, -1, -1, -1}, /* 9 - wa after virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 17, 18, 19, 20, 21, -1, -1, -1}, /* 10 - ha after virama */
{-1, -1, -1, -1, 7, 8, 9, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 11 - Virama after NGA+zwj */
{-2, -2, -2, -2, -2, -2, 13, 14, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2}, /* 12 - Second virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 15, 17, 18, 19, 20, 21, -1, -1, -1}, /* 13 - wa after virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 17, 18, 19, 20, 21, -1, -1, -1}, /* 14 - ha after virama */
{-2, -2, -2, -2, -2, -2, -2, 16, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2}, /* 15 - Third virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 17, 18, 19, 20, 21, -1, -1, -1}, /* 16 - ha after virama */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 20, 21, 1, 1, -1}, /* 17 - dl, Dependent vowel e */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 19, -1, 21, 1, 1, -1}, /* 18 - db, Dependent vowel u,uu */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1}, /* 19 - da, Dependent vowel i,ii,ai */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 22, -1, -1, -1, -1, -1, 1, 1, -1}, /* 20 - dr, Dependent vowel aa */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1}, /* 21 - sa, Sign anusvara */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, 23, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 22 - atha */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1}, /* 23 - zwnj for atha */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1}, /* 24 - Independent vowel */
{-2, -2, -2, -2, 26, 26, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2}, /* 25 - Virama after subscript consonant */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 12, 17, 18, 19, 20, 21, -1, 1, -1}, /* 26 - ra/ya after subscript consonant + virama */
{-1, 6, -1, -1, 7, 8, 9, 10, -1, 23, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 27 - Virama after ground state */
/* exit state -2 is for invalid order of medials and combination of invalids
with virama where virama should treat as start of next syllable
*/
};
/*#define MYANMAR_DEBUG */
#ifdef MYANMAR_DEBUG
#define MMDEBUG qDebug
#else
# define MMDEBUG \
if (0) \
printf
#endif
/*
// 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.
*/
static qsizetype myanmar_nextSyllableBoundary(const char16_t *s, qsizetype start, qsizetype end, bool *invalid)
{
const char16_t *uc = s + start;
int state = 0;
qsizetype pos = start;
*invalid = false;
while (pos < end) {
MymrCharClass charClass = getMyanmarCharClass(*uc);
state = mymrStateTable[state][charClass & Mymr_CF_CLASS_MASK];
if (pos == start)
*invalid = (bool)(charClass & Mymr_CF_DOTTED_CIRCLE);
MMDEBUG("state[%d]=%d class=%8x (uc=%4x)", int(pos - start), state, charClass, *uc);
if (state < 0) {
if (state < -1)
--pos;
break;
}
++uc;
++pos;
}
return pos;
}
static void myanmarAttributes(QChar::Script script, const char16_t *text, qsizetype from, qsizetype len, QCharAttributes *attributes)
{
qsizetype end = from + len;
const char16_t *uc = text + from;
qsizetype i = 0;
Q_UNUSED(script);
attributes += from;
while (i < len) {
bool invalid;
qsizetype boundary = myanmar_nextSyllableBoundary(text, from+i, end, &invalid) - from;
attributes[i].graphemeBoundary = true;
attributes[i].lineBreak = true;
if (boundary > len-1)
boundary = len;
i++;
while (i < boundary) {
attributes[i].graphemeBoundary = false;
++uc;
++i;
}
assert(i == boundary);
}
}
/*
// Vocabulary
// Base -> A consonant or an independent vowel in its full (not subscript) form. It is the
// center of the syllable, it can be surrounded by coeng (subscript) consonants, vowels,
// split vowels, signs... but there is only one base in a syllable, it has to be coded as
// the first character of the syllable.
// split vowel --> vowel that has two parts placed separately (e.g. Before and after the consonant).
// Khmer language has five of them. Khmer split vowels either have one part before the
// base and one after the base or they have a part before the base and a part above the base.
// The first part of all Khmer split vowels is the same character, identical to
// the glyph of Khmer dependent vowel SRA EI
// coeng --> modifier used in Khmer to construct coeng (subscript) consonants
// Differently than indian languages, the coeng modifies the consonant that follows it,
// not the one preceding it Each consonant has two forms, the base form and the subscript form
// the base form is the normal one (using the consonants code-point), the subscript form is
// displayed when the combination coeng + consonant is encountered.
// Consonant of type 1 -> A consonant which has subscript for that only occupies space under a base consonant
// Consonant of type 2.-> Its subscript form occupies space under and before the base (only one, RO)
// Consonant of Type 3 -> Its subscript form occupies space under and after the base (KHO, CHHO, THHO, BA, YO, SA)
// Consonant shifter -> Khmer has to series of consonants. The same dependent vowel has different sounds
// if it is attached to a consonant of the first series or a consonant of the second series
// Most consonants have an equivalent in the other series, but some of theme exist only in
// one series (for example SA). If we want to use the consonant SA with a vowel sound that
// can only be done with a vowel sound that corresponds to a vowel accompanying a consonant
// of the other series, then we need to use a consonant shifter: TRIISAP or MUSIKATOAN
// x17C9 y x17CA. TRIISAP changes a first series consonant to second series sound and
// MUSIKATOAN a second series consonant to have a first series vowel sound.
// Consonant shifter are both normally supercript marks, but, when they are followed by a
// superscript, they change shape and take the form of subscript dependent vowel SRA U.
// If they are in the same syllable as a coeng consonant, Unicode 3.0 says that they
// should be typed before the coeng. Unicode 4.0 breaks the standard and says that it should
// be placed after the coeng consonant.
// Dependent vowel -> In khmer dependent vowels can be placed above, below, before or after the base
// Each vowel has its own position. Only one vowel per syllable is allowed.
// Signs -> Khmer has above signs and post signs. Only one above sign and/or one post sign are
// Allowed in a syllable.
//
//
// order is important here! This order must be the same that is found in each horizontal
// line in the statetable for Khmer (see khmerStateTable) .
*/
enum KhmerCharClassValues {
CC_RESERVED = 0,
CC_CONSONANT = 1, /* Consonant of type 1 or independent vowel */
CC_CONSONANT2 = 2, /* Consonant of type 2 */
CC_CONSONANT3 = 3, /* Consonant of type 3 */
CC_ZERO_WIDTH_NJ_MARK = 4, /* Zero Width non joiner character (0x200C) */
CC_CONSONANT_SHIFTER = 5,
CC_ROBAT = 6, /* Khmer special diacritic accent -treated differently in state table */
CC_COENG = 7, /* Subscript consonant combining character */
CC_DEPENDENT_VOWEL = 8,
CC_SIGN_ABOVE = 9,
CC_SIGN_AFTER = 10,
CC_ZERO_WIDTH_J_MARK = 11, /* Zero width joiner character */
CC_COUNT = 12 /* This is the number of character classes */
};
enum KhmerCharClassFlags {
CF_CLASS_MASK = 0x0000FFFF,
CF_CONSONANT = 0x01000000, /* flag to speed up comparing */
CF_SPLIT_VOWEL = 0x02000000, /* flag for a split vowel -> the first part is added in front of the syllable */
CF_DOTTED_CIRCLE = 0x04000000, /* add a dotted circle if a character with this flag is the first in a syllable */
CF_COENG = 0x08000000, /* flag to speed up comparing */
CF_SHIFTER = 0x10000000, /* flag to speed up comparing */
CF_ABOVE_VOWEL = 0x20000000, /* flag to speed up comparing */
/* position flags */
CF_POS_BEFORE = 0x00080000,
CF_POS_BELOW = 0x00040000,
CF_POS_ABOVE = 0x00020000,
CF_POS_AFTER = 0x00010000,
CF_POS_MASK = 0x000f0000
};
/* Characters that get referred to by name */
enum KhmerChar {
C_SIGN_ZWNJ = 0x200C,
C_SIGN_ZWJ = 0x200D,
C_RO = 0x179A,
C_VOWEL_AA = 0x17B6,
C_SIGN_NIKAHIT = 0x17C6,
C_VOWEL_E = 0x17C1,
C_COENG = 0x17D2
};
/*
// 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 independently displayed, should be displayed with a dotted-circle to
// indicate error in syllable construction
*/
enum {
_xx = CC_RESERVED,
_sa = CC_SIGN_ABOVE | CF_DOTTED_CIRCLE | CF_POS_ABOVE,
_sp = CC_SIGN_AFTER | CF_DOTTED_CIRCLE| CF_POS_AFTER,
_c1 = CC_CONSONANT | CF_CONSONANT,
_c2 = CC_CONSONANT2 | CF_CONSONANT,
_c3 = CC_CONSONANT3 | CF_CONSONANT,
_rb = CC_ROBAT | CF_POS_ABOVE | CF_DOTTED_CIRCLE,
_cs = CC_CONSONANT_SHIFTER | CF_DOTTED_CIRCLE | CF_SHIFTER,
_dl = CC_DEPENDENT_VOWEL | CF_POS_BEFORE | CF_DOTTED_CIRCLE,
_db = CC_DEPENDENT_VOWEL | CF_POS_BELOW | CF_DOTTED_CIRCLE,
_da = CC_DEPENDENT_VOWEL | CF_POS_ABOVE | CF_DOTTED_CIRCLE | CF_ABOVE_VOWEL,
_dr = CC_DEPENDENT_VOWEL | CF_POS_AFTER | CF_DOTTED_CIRCLE,
_co = CC_COENG | CF_COENG | CF_DOTTED_CIRCLE,
/* split vowel */
_va = _da | CF_SPLIT_VOWEL,
_vr = _dr | CF_SPLIT_VOWEL
};
/*
// Character class: a character class value
// ORed with character class flags.
*/
typedef unsigned long KhmerCharClass;
/*
// 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 which the first part is before the base and the second one above the base
// _vr Khmer split vowel in which the first part is before the base and the second one behind (right of) the base
*/
static const KhmerCharClass 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 */
};
/* this enum must reflect the range of khmerCharClasses */
enum KhmerCharClassesRange {
KhmerFirstChar = 0x1780,
KhmerLastChar = 0x17df
};
/*
// 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
*/
static KhmerCharClass getKhmerCharClass(ushort uc)
{
if (uc == C_SIGN_ZWJ) {
return CC_ZERO_WIDTH_J_MARK;
}
if (uc == C_SIGN_ZWNJ) {
return CC_ZERO_WIDTH_NJ_MARK;
}
if (uc < KhmerFirstChar || uc > KhmerLastChar) {
return CC_RESERVED;
}
return khmerCharClasses[uc - KhmerFirstChar];
}
/*
// 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. 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 signed char khmerStateTable[][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 */
};
/* #define KHMER_DEBUG */
#ifdef KHMER_DEBUG
#define KHDEBUG qDebug
#else
# define KHDEBUG \
if (0) \
printf
#endif
/*
// 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.
*/
static qsizetype khmer_nextSyllableBoundary(const char16_t *s, qsizetype start, qsizetype end, bool *invalid)
{
const char16_t *uc = s + start;
int state = 0;
qsizetype pos = start;
*invalid = false;
while (pos < end) {
KhmerCharClass charClass = getKhmerCharClass(*uc);
if (pos == start) {
*invalid = (charClass > 0) && ! (charClass & CF_CONSONANT);
}
state = khmerStateTable[state][charClass & CF_CLASS_MASK];
KHDEBUG("state[%d]=%d class=%8lx (uc=%4x)", int(pos - start), state,
charClass, *uc );
if (state < 0) {
break;
}
++uc;
++pos;
}
return pos;
}
static void khmerAttributes(QChar::Script script, const char16_t *text, qsizetype from, qsizetype len, QCharAttributes *attributes)
{
qsizetype end = from + len;
const char16_t *uc = text + from;
qsizetype i = 0;
Q_UNUSED(script);
attributes += from;
while ( i < len ) {
bool invalid;
qsizetype boundary = khmer_nextSyllableBoundary( text, from+i, end, &invalid ) - from;
attributes[i].graphemeBoundary = true;
if ( boundary > len-1 ) boundary = len;
i++;
while ( i < boundary ) {
attributes[i].graphemeBoundary = false;
++uc;
++i;
}
assert( i == boundary );
}
}
const CharAttributeFunction charAttributeFunction[] = {
// Script_Unknown,
nullptr,
// Script_Inherited,
nullptr,
// Script_Common,
nullptr,
// Script_Latin,
nullptr,
// Script_Greek,
nullptr,
// Script_Cyrillic,
nullptr,
// Script_Armenian,
nullptr,
// Script_Hebrew,
nullptr,
// Script_Arabic,
nullptr,
// Script_Syriac,
nullptr,
// Script_Thaana,
nullptr,
// Script_Devanagari,
indicAttributes,
// Script_Bengali,
indicAttributes,
// Script_Gurmukhi,
indicAttributes,
// Script_Gujarati,
indicAttributes,
// Script_Oriya,
indicAttributes,
// Script_Tamil,
indicAttributes,
// Script_Telugu,
indicAttributes,
// Script_Kannada,
indicAttributes,
// Script_Malayalam,
indicAttributes,
// Script_Sinhala,
indicAttributes,
// Script_Thai,
thaiAttributes,
// Script_Lao,
nullptr,
// Script_Tibetan,
tibetanAttributes,
// Script_Myanmar,
myanmarAttributes,
// Script_Georgian,
nullptr,
// Script_Hangul,
nullptr,
// Script_Ethiopic,
nullptr,
// Script_Cherokee,
nullptr,
// Script_CanadianAboriginal,
nullptr,
// Script_Ogham,
nullptr,
// Script_Runic,
nullptr,
// Script_Khmer,
khmerAttributes
};
static void getCharAttributes(const char16_t *string, qsizetype stringLength,
const QUnicodeTools::ScriptItem *items, qsizetype numItems,
QCharAttributes *attributes)
{
if (stringLength == 0)
return;
for (qsizetype i = 0; i < numItems; ++i) {
QChar::Script script = items[i].script;
if (script > QChar::Script_Khmer)
script = QChar::Script_Common;
CharAttributeFunction attributeFunction = charAttributeFunction[script];
if (!attributeFunction)
continue;
qsizetype end = i < numItems - 1 ? items[i + 1].position : stringLength;
attributeFunction(script, string, items[i].position, end - items[i].position, attributes);
}
}
}
Q_CORE_EXPORT void initCharAttributes(QStringView string,
const ScriptItem *items, qsizetype numItems,
QCharAttributes *attributes, CharAttributeOptions options)
{
if (string.size() <= 0)
return;
if (!(options & DontClearAttributes))
::memset(attributes, 0, (string.size() + 1) * sizeof(QCharAttributes));
if (options & GraphemeBreaks)
getGraphemeBreaks(string.utf16(), string.size(), attributes);
if (options & WordBreaks)
getWordBreaks(string.utf16(), string.size(), attributes);
if (options & SentenceBreaks)
getSentenceBreaks(string.utf16(), string.size(), attributes);
if (options & LineBreaks)
getLineBreaks(string.utf16(), string.size(), attributes, options);
if (options & WhiteSpaces)
getWhiteSpaces(string.utf16(), string.size(), attributes);
if (!qt_initcharattributes_default_algorithm_only) {
if (!items || numItems <= 0)
return;
Tailored::getCharAttributes(string.utf16(), string.size(), items, numItems, attributes);
}
}
// ----------------------------------------------------------------------------
//
// The Unicode script property. See http://www.unicode.org/reports/tr24/tr24-24.html
//
// ----------------------------------------------------------------------------
Q_CORE_EXPORT void initScripts(QStringView string, ScriptItemArray *scripts)
{
qsizetype sor = 0;
qsizetype eor = 0;
QChar::Script script = QChar::Script_Common;
for (qsizetype i = 0; i < string.size(); ++i, eor = i) {
char32_t ucs4 = string[i].unicode();
if (QChar::isHighSurrogate(ucs4) && i + 1 < string.size()) {
ushort low = string[i + 1].unicode();
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++i;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QChar::Script nscript = QChar::Script(prop->script);
if (Q_LIKELY(nscript == script || nscript <= QChar::Script_Common))
continue;
// inherit preceding Common-s
if (Q_UNLIKELY(script <= QChar::Script_Common)) {
// also covers a case where the base character of Common script followed
// by one or more combining marks of non-Inherited, non-Common script
script = nscript;
continue;
}
// Never break between a combining mark (gc= Mc, Mn or Me) and its base character.
// Thus, a combining mark - whatever its script property value is - should inherit
// the script property value of its base character.
static const int test = (FLAG(QChar::Mark_NonSpacing) | FLAG(QChar::Mark_SpacingCombining) | FLAG(QChar::Mark_Enclosing));
if (Q_UNLIKELY(FLAG(prop->category) & test))
continue;
Q_ASSERT(script > QChar::Script_Common);
Q_ASSERT(sor < eor);
scripts->append(ScriptItem{sor, script});
sor = eor;
script = nscript;
}
Q_ASSERT(script >= QChar::Script_Common);
Q_ASSERT(eor == string.size());
scripts->append(ScriptItem{sor, script});
}
} // namespace QUnicodeTools
QT_END_NAMESPACE
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