--- a/graphicsdeviceinterface/gdi/sgdi/LinebreakComplex.cpp Wed Aug 25 08:17:25 2010 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,388 +0,0 @@
-// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
-// All rights reserved.
-// This component and the accompanying materials are made available
-// under the terms of "Eclipse Public License v1.0"
-// which accompanies this distribution, and is available
-// at the URL "http://www.eclipse.org/legal/epl-v10.html".
-//
-// Initial Contributors:
-// Nokia Corporation - initial contribution.
-//
-// Contributors:
-//
-// Description:
-//
-
-
-#include <e32std.h>
-#include <e32svr.h>
-#include "LineBreak.h"
-#include "LineBreakImp.h"
-#include "GlyphSel.h"
-
-const TText16 KThaiCodePageStart = 0x0E00;
-const TText16 KThaiCodePageEnd = 0x0E5C;
-const TUint KNumThaiCharacters = KThaiCodePageEnd - KThaiCodePageStart;
-
-/**
- Ecanpsulates rules for when Thai character sequence line breaking.
-@internalComponent
-*/
-class ThaiLinebreakRules
- {
-public:
- enum TCharClassification
- {
- EOutOfRange,
-
- EConsOAng,
- EConsYoYak,
- EConsHoHip,
- EConsWoWean,
- EConsDigraph,
- EConsOther,
-
- EPostVowelA,
- EPostVowelAA,
- EPostVowelOther,
- EPreVowel,
-
- EDepMaiHanAkat,
- EDepSaraI,
- EDepOther,
-
- // marker for end
- EMaxClassification
- };
- enum
- {
- KOutOfRangeFlag = 1 << EOutOfRange,
- KConsOAngFlag = 1 << EConsOAng,
- KConsYoYakFlag = 1 << EConsYoYak,
- KConsHoHipFlag = 1 << EConsHoHip,
- KConsWoWeanFlag = 1 << EConsWoWean,
- KConsDigraphFlag = 1 << EConsDigraph,
- KConsOtherFlag = 1 << EConsOther,
- KPostVowelAFlag = 1 << EPostVowelA,
- KPostVowelAAFlag = 1 << EPostVowelAA,
- KPostVowelOtherFlag = 1 << EPostVowelOther,
- KPreVowelFlag = 1 << EPreVowel,
- KDepMaiHanAkatFlag = 1 << EDepMaiHanAkat,
- KDepSaraIFlag = 1 << EDepSaraI,
- KDepOtherFlag = 1 << EDepOther,
-
- KSpecialDepFlags = KDepMaiHanAkatFlag | KDepSaraIFlag,
- KPostVowelFlags = KPostVowelAFlag | KPostVowelAAFlag | KPostVowelOtherFlag,
- KConsFlags = KConsOtherFlag | KConsDigraphFlag | KConsWoWeanFlag
- | KConsHoHipFlag | KConsYoYakFlag | KConsOAngFlag,
- KAllFlags = KOutOfRangeFlag | KConsOAngFlag | KConsYoYakFlag
- | KConsHoHipFlag | KConsWoWeanFlag | KConsDigraphFlag
- | KConsOtherFlag | KPostVowelAFlag | KPostVowelAAFlag
- | KPostVowelOtherFlag | KPreVowelFlag | KDepMaiHanAkatFlag
- | KDepSaraIFlag | KDepOtherFlag
- };
-
- /** Returns the Thai linebreaking class of the character. */
- static TCharClassification Class(TInt aChar);
- /** Returns true if aChar is a combining character according to aBreaker. */
- static TBool IsCombiningChar(TInt aChar, const MLineBreaker& aBreaker);
- /** Returns the Thai linebreaking class of the character at (*aChar),
- searching backwards for the base character if it is foreign and of type CM.
- @param aChar The position of the character within the string.
- @param aStart The start of the string.
- @param aBreaker The line breaker to query for line breaking class.
- */
- static TCharClassification DerivedClass(const TText* aChar,
- const TText* aStart, const MLineBreaker& aBreaker);
- /**
- Gets the line break rule for the previous and current character pair
- @param aPrevClass Class of the previous character.
- @param aClass Class of the current character.
- @return the rule code corresponding to the input pair.
- */
- static TBool BreakAllowedBetween(
- TCharClassification aPrevClass, TCharClassification aClass);
- /** Returns whether a line break is allowed before the SA character at
- (*aChar).
- @param aChar The position of the character within the string.
- @param aStart The start of the string.
- @param aBreaker The line breaker to query for line breaking class.
- */
- static TBool BreakAllowedAt(const TText* aChar,
- const TText* aStart, const MLineBreaker& aBreaker);
-
- /**
- Classification of each character
- */
- static const TUint8 KCharClassifications[KNumThaiCharacters];
-
- /**
- Rules table of prev to next character
- */
- static const TUint32 KRules[EMaxClassification];
- };
-
-const TUint8 ThaiLinebreakRules::KCharClassifications[KNumThaiCharacters] =
- {
- EOutOfRange, // 0x0E00
- EConsOther, // 0x0E01
- EConsOther, // 0x0E02
- EConsOther, // 0x0E03
- EConsOther, // 0x0E04
- EConsOther, // 0x0E05
- EConsOther, // 0x0E06
- EConsDigraph, // 0x0E07
- EConsOther, // 0x0E08
- EConsOther, // 0x0E09
- EConsOther, // 0x0E0A
- EConsOther, // 0x0E0B
- EConsOther, // 0x0E0C
- EConsOther, // 0x0E0D
- EConsOther, // 0x0E0E
- EConsOther, // 0x0E0F
-
- EConsOther, // 0x0E10
- EConsOther, // 0x0E11
- EConsOther, // 0x0E12
- EConsOther, // 0x0E13
- EConsOther, // 0x0E14
- EConsOther, // 0x0E15
- EConsOther, // 0x0E16
- EConsOther, // 0x0E17
- EConsOther, // 0x0E18
- EConsDigraph, // 0x0E19
- EConsOther, // 0x0E1A
- EConsOther, // 0x0E1B
- EConsOther, // 0x0E1C
- EConsOther, // 0x0E1D
- EConsOther, // 0x0E1E
- EConsOther, // 0x0E1F
-
- EConsOther, // 0x0E20
- EConsDigraph, // 0x0E21
- EConsYoYak, // 0x0E22
- EConsDigraph, // 0x0E23
- EConsOther, // 0x0E24
- EConsDigraph, // 0x0E25
- EConsOther, // 0x0E26
- EConsWoWean, // 0x0E27
- EConsOther, // 0x0E28
- EConsOther, // 0x0E29
- EConsOther, // 0x0E2A
- EConsHoHip, // 0x0E2B
- EConsOther, // 0x0E2C
- EConsOAng, // 0x0E2D
- EConsOther, // 0x0E2E
- EOutOfRange, // 0x0E2F
-
- EPostVowelA, // 0x0E30
- EDepMaiHanAkat, // 0x0E31
- EPostVowelAA, // 0x0E32
- EPostVowelOther,// 0x0E33
-
- EDepSaraI, // 0x0E34
- EDepOther, // 0x0E35
- EDepOther, // 0x0E36
- EDepOther, // 0x0E37
- EDepOther, // 0x0E38
- EDepOther, // 0x0E39
- EDepOther, // 0x0E3A
-
- EOutOfRange, // 0x0E3B
- EOutOfRange, // 0x0E3C
- EOutOfRange, // 0x0E3D
- EOutOfRange, // 0x0E3E
- EOutOfRange, // 0x0E3F
-
- EPreVowel, // 0x0E40
- EPreVowel, // 0x0E41
- EPreVowel, // 0x0E42
- EPreVowel, // 0x0E43
- EPreVowel, // 0x0E44
-
- EPostVowelOther,// 0x0E45
- EOutOfRange, // 0x0E46
-
- EDepOther, // 0x0E47
- EDepOther, // 0x0E48
- EDepOther, // 0x0E49
- EDepOther, // 0x0E4A
- EDepOther, // 0x0E4B
- EDepOther, // 0x0E4C
- EDepOther, // 0x0E4D
- EDepOther, // 0x0E4E
- EOutOfRange, // 0x0E4F
-
- EOutOfRange, // 0x0E50
- EOutOfRange, // 0x0E51
- EOutOfRange, // 0x0E52
- EOutOfRange, // 0x0E53
- EOutOfRange, // 0x0E54
- EOutOfRange, // 0x0E55
- EOutOfRange, // 0x0E56
- EOutOfRange, // 0x0E57
- EOutOfRange, // 0x0E58
- EOutOfRange, // 0x0E59
- EOutOfRange, // 0x0E5A
- EOutOfRange // 0x0E5B
- };
-
-const TUint32 KNormalBreaksBeforeCons =
- ThaiLinebreakRules::KPreVowelFlag
- | ThaiLinebreakRules::KConsOtherFlag
- | ThaiLinebreakRules::KConsDigraphFlag
- | ThaiLinebreakRules::KConsHoHipFlag
- | ThaiLinebreakRules::KOutOfRangeFlag;
-const TUint32 KNormalBreaksBeforePostVowel =
- ThaiLinebreakRules::KPreVowelFlag
- | ThaiLinebreakRules::KPostVowelFlags
- | ThaiLinebreakRules::KConsFlags
- | ThaiLinebreakRules::KOutOfRangeFlag;
-const TUint32 ThaiLinebreakRules::KRules[EMaxClassification] =
- {
- /* Prev Char EOutOfRange */
- KAllFlags - KOutOfRangeFlag,
- /* Prev Char EConsOAng */
- KNormalBreaksBeforeCons,
- /* Prev Char EConsYoYak */
- KNormalBreaksBeforeCons,
- /* Prev Char EConsHoHip */
- KNormalBreaksBeforeCons - KConsDigraphFlag,
- /* Prev Char EConsWoWean */
- KNormalBreaksBeforeCons - KConsDigraphFlag - KConsHoHipFlag,
- /* Prev Char EConsDigraph */
- KNormalBreaksBeforeCons,
- /* Prev Char EConsOther */
- KNormalBreaksBeforeCons,
- /* Prev Char EPostVowelA */
- KNormalBreaksBeforePostVowel,
- /* Prev Char EPostVowelAA */
- KNormalBreaksBeforePostVowel - KPostVowelAFlag,
- /* Prev Char EPostVowelOther */
- KNormalBreaksBeforePostVowel,
- /* Prev Char EPreVowel */
- KPreVowelFlag | KPostVowelFlags | KOutOfRangeFlag,
- /* Prev Char EDepMaiHanAkat */
- KSpecialDepFlags | KPreVowelFlag | KPostVowelAAFlag
- | KPostVowelAFlag | KOutOfRangeFlag,
- /* Prev Char EDepSaraI */
- KSpecialDepFlags | KPreVowelFlag | KPostVowelAAFlag
- | KPostVowelAFlag | KOutOfRangeFlag,
- /* Prev Char EDepOther */
- KSpecialDepFlags | KPreVowelFlag | KPostVowelAAFlag
- | KPostVowelAFlag | KConsOtherFlag | KConsDigraphFlag
- | KConsWoWeanFlag | KConsHoHipFlag | KOutOfRangeFlag
- };
-
-ThaiLinebreakRules::TCharClassification ThaiLinebreakRules::Class(TInt a)
- {
- return static_cast<TCharClassification>(
- (KThaiCodePageStart <= a && a < KThaiCodePageEnd) ?
- KCharClassifications[a - KThaiCodePageStart] :
- EOutOfRange);
- }
-
-TBool ThaiLinebreakRules::IsCombiningChar(TInt aChar,
- const MLineBreaker& aBreaker)
- {
- TUint dummy1, dummy2;
- return aBreaker.LineBreakClass(aChar, dummy1, dummy2) == MLineBreaker::ECmLineBreakClass;
- }
-
-ThaiLinebreakRules::TCharClassification ThaiLinebreakRules::DerivedClass(
- const TText* aChar, const TText* aStart, const MLineBreaker& aBreaker)
- {
- ThaiLinebreakRules::TCharClassification c = Class(*aChar);
- while (c == EOutOfRange && aChar != aStart
- && IsCombiningChar(*aChar, aBreaker))
- {
- --aChar;
- c = Class(*aChar);
- }
- return c;
- }
-
-TBool ThaiLinebreakRules::BreakAllowedBetween(
- ThaiLinebreakRules::TCharClassification aClass,
- ThaiLinebreakRules::TCharClassification aNextClass)
- {
- return KRules[aClass] & (1 << aNextClass);
- }
-
-TBool ThaiLinebreakRules::BreakAllowedAt(const TText* aChar,
- const TText* aStart, const MLineBreaker& aBreaker)
- {
- __ASSERT_DEBUG(aStart < aChar, User::Invariant());
- TCharClassification c = Class(*aChar);
- if (c == EOutOfRange && IsCombiningChar(*aChar, aBreaker))
- return EFalse;
- return BreakAllowedBetween(DerivedClass(aChar - 1, aStart, aBreaker), c);
- }
-
-/**
- Returns whether a line break is possible within a run of characters all having
- the class ESaLineBreakClass (Complex content). Languages with Unicocde
- characters having such a class include: Thai, Lao, Myanmar and Khmer. This
- default implementation of the GetLineBreakInContext() method only supports the
- Thai script. Breaks are determined in Thai based on a simple understanding of
- syllable boundaries. When characters from the other unsupported Sa class
- languages are found the method exits with EFalse.
-@param aText
- The text to be searched, which is a contiguous run of characters of class SA
- (or CM attatched to SA). The break position may be restricted further by
- aMinBreakPos and aMaxBreakPos, but more text is provided for extra context
- should it be needed.
-@param aMinBreakPos
- The start of the text to be considered for line breaks.
-@param aMaxBreakPos
- The end of the text to be considered for line breaks.
-@param aForwards
- ETrue if aBreakPos is to be set with the first legal break position,
- EFalse if aBreakPos is to be set with the last legal break position.
-@param aBreakPos
- If break position found on exit its value is >= Min and <= Max
- positions supplied.
-@return TBool
- ETrue if and only if a legal break was found, EFalse otherwise.
-@publishedAll
-@released
-*/
-EXPORT_C TBool MLineBreaker::GetLineBreakInContext(const TDesC16& aText,
- TInt aMinBreakPos, TInt aMaxBreakPos, TBool aForwards,
- TInt& aBreakPos) const
- {
- __ASSERT_DEBUG (0 <= aMinBreakPos && aMaxBreakPos <= aText.Length(),
- Panic(ELineBreakPanic_InvalidInputParam));
-
- TInt length = aText.Length();
-
- if (aMinBreakPos < 1)
- aMinBreakPos = 1;
- if (length - 1 < aMaxBreakPos)
- aMaxBreakPos = length - 1;
- if (aMaxBreakPos < aMinBreakPos)
- return EFalse;
-
- const TText16* text = aText.Ptr();
-
- if (*text == KZeroWidthSpace)
- {
- aBreakPos = aMinBreakPos;
- return ETrue;
- }
- else if (*(text+length-1) == KZeroWidthSpace)
- return EFalse;
-
- TInt start = aForwards? aMinBreakPos : aMaxBreakPos;
- TInt end = aForwards? aMaxBreakPos + 1 : aMinBreakPos - 1;
- TInt direction = aForwards? 1 : -1;
- for (TInt i = start; i != end; i += direction)
- {
- if (ThaiLinebreakRules::BreakAllowedAt(text + i, text, *this))
- {
- aBreakPos = i;
- return ETrue;
- }
- }
- return EFalse;
- }