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|
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qunicodetools_p.h"
#include "qunicodetables_p.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 http://www.unicode.org/reports/tr29/tr29-19.html
//
// -----------------------------------------------------------------------------------------------------
namespace GB {
static const uchar breakTable[QUnicodeTables::GraphemeBreakLVT + 1][QUnicodeTables::GraphemeBreakLVT + 1] = {
// Other CR LF Control Extend Prepend S-Mark L V T LV LVT
{ true , true , true , true , false, true , false, true , true , true , true , true }, // Other
{ true , true , false, true , true , true , true , true , true , true , true , true }, // CR
{ true , true , true , true , true , true , true , true , true , true , true , true }, // LF
{ true , true , true , true , true , true , true , true , true , true , true , true }, // Control
{ true , true , true , true , false, true , false, true , true , true , true , true }, // Extend
{ false, true , true , true , false, false, false, false, false, false, false, false }, // Prepend
{ true , true , true , true , false, true , false, true , true , true , true , true }, // SpacingMark
{ true , true , true , true , false, true , false, false, false, true , false, false }, // L
{ true , true , true , true , false, true , false, true , false, false, true , true }, // V
{ true , true , true , true , false, true , false, true , true , false, true , true }, // T
{ true , true , true , true , false, true , false, true , false, false, true , true }, // LV
{ true , true , true , true , false, true , false, true , true , false, true , true }, // LVT
};
} // namespace GB
static void getGraphemeBreaks(const ushort *string, quint32 len, HB_CharAttributes *attributes)
{
QUnicodeTables::GraphemeBreak lcls = QUnicodeTables::GraphemeBreakLF; // to meet GB1
for (quint32 i = 0; i != len; ++i) {
quint32 pos = 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;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::GraphemeBreak cls = (QUnicodeTables::GraphemeBreak) prop->graphemeBreak;
attributes[pos].charStop = GB::breakTable[lcls][cls];
lcls = cls;
}
}
namespace WB {
enum Action {
NoBreak = 0,
Break = 1,
Lookup = 2
};
static const uchar breakTable[QUnicodeTables::WordBreakExtendNumLet + 1][QUnicodeTables::WordBreakExtendNumLet + 1] = {
// Other CR LF Newline Format Katakana ALetter MidNumLet MidLetter MidNum Numeric ExtendNumLet
{ Break , Break , Break , Break , NoBreak, Break , Break , Break , Break , Break , Break , Break }, // Other
{ Break , Break , NoBreak, Break , Break , Break , Break , Break , Break , Break , Break , Break }, // CR
{ 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 }, // Newline
{ Break , Break , Break , Break , NoBreak, Break , Break , Break , Break , Break , Break , Break }, // Format
{ Break , Break , Break , Break , NoBreak, NoBreak, Break , Break , Break , Break , Break , NoBreak }, // Katakana
{ Break , Break , Break , Break , NoBreak, Break , NoBreak, Lookup , Lookup , Break , NoBreak, NoBreak }, // ALetter
{ Break , Break , Break , Break , NoBreak, Break , Break , Break , Break , Break , Break , Break }, // MidNumLet
{ Break , Break , Break , Break , NoBreak, Break , Break , Break , Break , Break , Break , Break }, // MidLetter
{ Break , Break , Break , Break , NoBreak, Break , Break , Break , Break , Break , Break , Break }, // MidNum
{ Break , Break , Break , Break , NoBreak, Break , NoBreak, Lookup , Break , Lookup , NoBreak, NoBreak }, // Numeric
{ Break , Break , Break , Break , NoBreak, NoBreak, NoBreak, Break , Break , Break , NoBreak, NoBreak }, // ExtendNumLet
};
} // namespace WB
static void getWordBreaks(const ushort *string, quint32 len, HB_CharAttributes *attributes)
{
QUnicodeTables::WordBreak cls = QUnicodeTables::WordBreakLF; // to meet WB1
for (quint32 i = 0; i != len; ++i) {
quint32 pos = 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;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::WordBreak ncls = (QUnicodeTables::WordBreak) prop->wordBreak;
uchar action = WB::breakTable[cls][ncls];
if (ncls == QUnicodeTables::WordBreakFormat) {
// WB4: X(Extend|Format)* -> X
if (action != WB::Break)
continue;
} else {
if (action == WB::Lookup) {
action = WB::Break;
for (quint32 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::WordBreak tcls = (QUnicodeTables::WordBreak) prop->wordBreak;
if (tcls == QUnicodeTables::WordBreakFormat)
continue;
if (tcls == cls) {
i = lookahead;
ncls = tcls;
action = WB::NoBreak;
}
break;
}
}
}
cls = ncls;
if (action == WB::Break)
attributes[pos].wordBoundary = true;
}
}
namespace SB {
enum State {
Initial,
Upper,
UpATerm,
ATerm,
ATermC,
ACS,
STerm,
STermC,
SCS,
BAfterC,
BAfter,
Break,
Lookup
};
static const uchar breakTable[BAfter + 1][QUnicodeTables::SentenceBreakClose + 1] = {
// Other CR LF Sep Format Sp Lower Upper OLetter Numeric ATerm SContinue STerm Close
{ Initial, BAfterC, BAfter , BAfter , Initial, Initial, Initial, Upper , Initial, Initial, ATerm , Initial, STerm , Initial }, // Initial
{ Initial, BAfterC, BAfter , BAfter , Upper , Initial, Initial, Upper , Initial, Initial, UpATerm, STerm , STerm , Initial }, // Upper
{ Lookup , BAfterC, BAfter , BAfter , UpATerm, ACS , Initial, Upper , Break , Initial, ATerm , STerm , STerm , ATermC }, // UpATerm
{ 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 ushort *string, quint32 len, HB_CharAttributes *attributes)
{
uchar state = SB::BAfter; // to meet SB1
for (quint32 i = 0; i != len; ++i) {
quint32 pos = 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;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::SentenceBreak ncls = (QUnicodeTables::SentenceBreak) prop->sentenceBreak;
Q_ASSERT(state <= SB::BAfter);
state = SB::breakTable[state][ncls];
if (state == SB::Lookup) { // SB8
state = SB::Break;
for (quint32 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::SentenceBreak tcls = (QUnicodeTables::SentenceBreak) prop->sentenceBreak;
switch (tcls) {
case QUnicodeTables::SentenceBreakOther:
case QUnicodeTables::SentenceBreakFormat:
case QUnicodeTables::SentenceBreakSp:
case QUnicodeTables::SentenceBreakNumeric:
case QUnicodeTables::SentenceBreakSContinue:
case QUnicodeTables::SentenceBreakClose:
continue;
case QUnicodeTables::SentenceBreakLower:
i = lookahead;
state = SB::Initial;
break;
default:
break;
}
break;
}
}
if (state == SB::Break) {
attributes[pos].sentenceBoundary = true;
state = SB::breakTable[SB::Initial][ncls];
}
}
}
// -----------------------------------------------------------------------------------------------------
//
// The line breaking algorithm. See http://www.unicode.org/reports/tr14/tr14-28.html
//
// -----------------------------------------------------------------------------------------------------
namespace LB {
// 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
enum Action {
ProhibitedBreak, PB = ProhibitedBreak,
DirectBreak, DB = DirectBreak,
IndirectBreak, IB = IndirectBreak,
CombiningIndirectBreak, CI = CombiningIndirectBreak,
CombiningProhibitedBreak, CP = CombiningProhibitedBreak
};
static const uchar breakTable[QUnicodeTables::LineBreak_JT + 1][QUnicodeTables::LineBreak_JT + 1] = {
/* 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 */
/* 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 },
/* CL */ { DB, PB, PB, IB, IB, PB, PB, PB, PB, IB, IB, DB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB },
/* CP */ { DB, PB, PB, IB, IB, PB, PB, PB, PB, IB, IB, IB, IB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB },
/* 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 },
/* 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 },
/* 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 },
/* EX */ { 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 },
/* SY */ { DB, PB, PB, IB, IB, IB, PB, PB, PB, DB, DB, IB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB },
/* IS */ { 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 },
/* PR */ { IB, 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 },
/* PO */ { IB, 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 },
/* 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 },
/* AL */ { 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 },
/* HL */ { 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 },
/* 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 },
/* 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 },
/* HY */ { DB, PB, PB, IB, DB, IB, PB, PB, PB, DB, DB, IB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB },
/* BA */ { DB, PB, PB, IB, DB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 },
/* 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 }
};
} // namespace LB
static void getLineBreaks(const ushort *string, quint32 len, HB_CharAttributes *attributes)
{
uint lucs4 = 0;
QUnicodeTables::LineBreakClass lcls = QUnicodeTables::LineBreak_LF; // to meet LB10
QUnicodeTables::LineBreakClass cls = lcls;
for (quint32 i = 0; i != len; ++i) {
quint32 pos = 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;
}
}
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::LineBreakClass ncls = (QUnicodeTables::LineBreakClass) prop->line_break_class;
if (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 (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;
}
HB_LineBreakType lineBreakType = HB_NoBreak;
if (lcls >= QUnicodeTables::LineBreak_CR) {
// LB4: BK!, LB5: (CRxLF|CR|LF|NL)!
if (lcls > QUnicodeTables::LineBreak_CR || ncls != QUnicodeTables::LineBreak_LF)
lineBreakType = HB_ForcedBreak;
goto next;
}
if (ncls >= QUnicodeTables::LineBreak_SP) {
if (ncls > QUnicodeTables::LineBreak_SP)
goto next; // LB6: x(BK|CR|LF|NL)
goto next_no_cls_update; // LB7: xSP
}
// 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 (cls >= QUnicodeTables::LineBreak_SA)
cls = QUnicodeTables::LineBreak_AL;
switch (LB::breakTable[cls][ncls < QUnicodeTables::LineBreak_SA ? ncls : QUnicodeTables::LineBreak_AL]) {
case LB::DirectBreak:
lineBreakType = HB_Break;
if (lucs4 == 0x00ad) // soft hyphen
lineBreakType = HB_SoftHyphen;
break;
case LB::IndirectBreak:
if (lcls == QUnicodeTables::LineBreak_SP)
lineBreakType = HB_Break;
break;
case LB::CombiningIndirectBreak:
if (lcls != QUnicodeTables::LineBreak_SP)
goto next_no_cls_update;
lineBreakType = HB_Break;
break;
case LB::CombiningProhibitedBreak:
if (lcls != QUnicodeTables::LineBreak_SP)
goto next_no_cls_update;
break;
case LB::ProhibitedBreak:
// nothing to do
default:
break;
}
next:
cls = ncls;
lucs4 = ucs4;
next_no_cls_update:
lcls = ncls;
if (lineBreakType != HB_NoBreak)
attributes[pos].lineBreakType = lineBreakType;
}
attributes[0].lineBreakType = HB_NoBreak; // LB2
}
static void getWhiteSpaces(const ushort *string, quint32 len, HB_CharAttributes *attributes)
{
for (quint32 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 (QChar::isSpace(ucs4))
attributes[i].whiteSpace = true;
}
}
Q_CORE_EXPORT void initCharAttributes(const ushort *string, int length,
const HB_ScriptItem *items, int numItems,
HB_CharAttributes *attributes, CharAttributeOptions options)
{
if (length <= 0)
return;
if (!(options & DontClearAttributes))
::memset(attributes, 0, length * sizeof(HB_CharAttributes));
if (options & GraphemeBreaks)
getGraphemeBreaks(string, length, attributes);
if (options & WordBreaks)
getWordBreaks(string, length, attributes);
if (options & SentenceBreaks)
getSentenceBreaks(string, length, attributes);
if (options & LineBreaks)
getLineBreaks(string, length, attributes);
if (options & WhiteSpaces)
getWhiteSpaces(string, length, attributes);
if (!items || numItems <= 0)
return;
if (!qt_initcharattributes_default_algorithm_only)
HB_GetTailoredCharAttributes(string, length, items, numItems, attributes);
}
} // namespace QUnicodeTools
QT_END_NAMESPACE
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