author | Pat Downey <patrick.downey@nokia.com> |
Thu, 25 Jun 2009 15:59:54 +0100 | |
changeset 1 | 0a7b44b10206 |
child 2 | 806186ab5e14 |
permissions | -rw-r--r-- |
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// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Symbian Foundation License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// e32\euser\unicode\unicode.cpp |
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// The implementation of the base-level Unicode character classification functions. These are members of |
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// a class called TUnicode that contains a Unicode value. |
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// |
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// |
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|
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#include <unicode.h> |
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#include "compareimp.h" |
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|
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static const TUnicodeData TheDefaultUnicodeData = |
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{ TChar::ECnCategory, TChar::EOtherNeutral, 0, 0, 0, TUnicodeData::ENonNumeric }; |
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|
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// Fill in a TChar::TCharInfo structure with category information about the character. |
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void TUnicode::GetInfo(TChar::TCharInfo& aInfo,const TUnicodeDataSet *aOverridingDataSet) const |
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{ |
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const TUnicodeData& data = GetData(aOverridingDataSet); |
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aInfo.iCategory = (TChar::TCategory)data.iCategory; |
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aInfo.iBdCategory = (TChar::TBdCategory)data.iBdCategory; |
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aInfo.iCombiningClass = data.iCombiningClass; |
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aInfo.iLowerCase = iCode; |
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aInfo.iUpperCase = iCode; |
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aInfo.iTitleCase = iCode; |
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if (data.iFlags & TUnicodeData::EHasLowerCase) |
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aInfo.iLowerCase = GetLowerCase(data); |
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if (data.iFlags & TUnicodeData::EHasUpperCase) |
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aInfo.iUpperCase = GetUpperCase(data); |
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if (data.iFlags & TUnicodeData::EHasTitleCase) |
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aInfo.iTitleCase = GetTitleCase(data); |
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aInfo.iMirrored = data.iFlags & TUnicodeData::EMirrored; |
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if (data.iFlags & TUnicodeData::ENumericFlags) |
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aInfo.iNumericValue = GetNumericValue(data); |
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else |
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aInfo.iNumericValue = -1; |
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} |
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|
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/* |
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Get the data describing a character. If "aOverridingDataSet" is non-null, look in that |
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data set before searching the standard data set. |
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*/ |
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const TUnicodeData& TUnicode::GetData(const TUnicodeDataSet *aOverridingDataSet) const |
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{ |
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const TUnicodeData *result = NULL; |
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if (aOverridingDataSet) |
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result = GetDataFromDataSet(*aOverridingDataSet); |
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if (result == NULL) |
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{ |
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if (0xFFFF < iCode) |
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// for now we have no data for values above U+FFFF |
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return TheDefaultUnicodeData; |
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int index = TheStandardUnicodeDataSet.iIndex1[iCode >> 4]; |
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if (index & 0x8000) // high bit set means all values in block have the same value, and it's in the index |
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index &= ~0x8000; |
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else |
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index = TheStandardUnicodeDataSet.iIndex2[index + (iCode & 0x000F)]; |
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return TheStandardUnicodeDataSet.iData[index]; |
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} |
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|
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return *result; |
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} |
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|
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/* |
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Given a character data set, get the data referring to this character. |
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Return NULL if no data is available in this data set. |
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*/ |
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const TUnicodeData *TUnicode::GetDataFromDataSet(const TUnicodeDataSet& aDataSet) const |
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{ |
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// Perform a binary chop to find the range containing this character. |
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TInt n = aDataSet.iRanges; |
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const TUnicodeDataRange *base = aDataSet.iRange; |
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const TUnicodeDataRange *last = base + n - 1; |
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const TUnicodeDataRange *r = base; |
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|
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while (n > 1) |
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{ |
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TInt pivot = n / 2; |
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r += pivot; |
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if (iCode < r->iRangeStart) // it's before this range |
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n = pivot; |
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else if (r < last && iCode >= r[1].iRangeStart) // it's after this range |
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{ |
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base = r + 1; |
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n -= pivot + 1; |
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} |
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else // it's in this range |
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break; |
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r = base; |
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} |
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|
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if (r->iIndex >= 0) |
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return &aDataSet.iData[r->iIndex]; // index >= 0: data available |
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else |
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return NULL; // index < 0: no data available |
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} |
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|
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EXPORT_C TChar::TCategory TUnicode::GetCategory(const TUnicodeDataSet *aOverridingDataSet) const |
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{ |
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return (TChar::TCategory)GetData(aOverridingDataSet).iCategory; |
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} |
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|
112 |
|
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113 |
TChar::TBdCategory TUnicode::GetBdCategory(const TUnicodeDataSet *aOverridingDataSet) const |
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114 |
{ |
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115 |
return (TChar::TBdCategory)GetData(aOverridingDataSet).iBdCategory; |
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116 |
} |
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117 |
|
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118 |
TInt TUnicode::GetCombiningClass(const TUnicodeDataSet *aOverridingDataSet) const |
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119 |
{ |
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120 |
return GetData(aOverridingDataSet).iCombiningClass; |
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121 |
} |
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122 |
|
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123 |
EXPORT_C TUint TUnicode::GetLowerCase(const TUnicodeDataSet *aOverridingDataSet) const |
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124 |
{ |
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125 |
return GetLowerCase(GetData(aOverridingDataSet)); |
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126 |
} |
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127 |
|
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128 |
EXPORT_C TUint TUnicode::GetUpperCase(const TUnicodeDataSet *aOverridingDataSet) const |
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129 |
{ |
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130 |
return GetUpperCase(GetData(aOverridingDataSet)); |
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131 |
} |
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132 |
|
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133 |
TUint TUnicode::GetLowerCase(const TUnicodeData& aData) const |
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134 |
{ |
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135 |
if (aData.iFlags & TUnicodeData::EHasLowerCase) |
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136 |
return iCode + aData.iCaseOffset; |
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137 |
else |
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138 |
return iCode; |
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139 |
} |
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140 |
|
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141 |
TUint TUnicode::GetUpperCase(const TUnicodeData& aData) const |
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142 |
{ |
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143 |
if (aData.iFlags & TUnicodeData::EHasUpperCase) |
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144 |
return iCode - aData.iCaseOffset; |
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145 |
else |
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146 |
return iCode; |
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147 |
} |
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|
148 |
|
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149 |
TUint TUnicode::GetTitleCase(const TUnicodeDataSet *aOverridingDataSet) const |
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150 |
{ |
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151 |
return GetTitleCase(GetData(aOverridingDataSet)); |
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152 |
} |
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|
153 |
|
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154 |
TUint TUnicode::GetTitleCase(const TUnicodeData& aData) const |
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155 |
{ |
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156 |
// Handle the very few characters with distinct title case variants. |
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157 |
if (aData.iFlags & TUnicodeData::EHasTitleCase) |
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158 |
{ |
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|
159 |
// If the character has no upper case variant add one to get the title case form. |
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160 |
if (!(aData.iFlags & TUnicodeData::EHasUpperCase)) |
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161 |
return iCode + 1; |
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162 |
// If the character has no lower case variant subtract one to get the title case form. |
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163 |
if (!(aData.iFlags & TUnicodeData::EHasLowerCase)) |
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164 |
return iCode - 1; |
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|
165 |
// Both upper and lower case forms exist so the character itself must be title case. |
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166 |
return iCode; |
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|
167 |
} |
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|
168 |
|
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|
169 |
// All other characters have title case forms that are the same as their upper case forms. |
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|
170 |
return GetUpperCase(aData); |
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|
171 |
} |
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|
172 |
|
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|
173 |
TBool TUnicode::IsMirrored(const TUnicodeDataSet *aOverridingDataSet) const |
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|
174 |
{ |
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|
175 |
return GetData(aOverridingDataSet).iFlags & TUnicodeData::EMirrored; |
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|
176 |
} |
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|
177 |
|
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|
178 |
TInt TUnicode::GetNumericValue(const TUnicodeDataSet *aOverridingDataSet) const |
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|
179 |
{ |
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|
180 |
return GetNumericValue(GetData(aOverridingDataSet)); |
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|
181 |
} |
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|
182 |
|
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|
183 |
/* |
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|
184 |
Return the integer numeric value of this character. |
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|
185 |
Return -1 if the character is not numeric, or -2 if it has a fractional value. |
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|
186 |
*/ |
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|
187 |
TInt TUnicode::GetNumericValue(const TUnicodeData& aData) const |
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|
188 |
{ |
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|
189 |
switch (aData.iFlags & TUnicodeData::ENumericFlags) |
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|
190 |
{ |
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|
191 |
case TUnicodeData::ENonNumeric: return -1; |
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|
192 |
case TUnicodeData::ESmallNumeric: return (iCode + aData.iDigitOffset) & 0xFF; |
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|
193 |
case TUnicodeData::EFiveHundred: return 500; |
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|
194 |
case TUnicodeData::EOneThousand: return 1000; |
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|
195 |
case TUnicodeData::EFiveThousand: return 5000; |
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|
196 |
case TUnicodeData::ETenThousand: return 10000; |
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|
197 |
case TUnicodeData::EHundredThousand: return 100000; |
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|
198 |
case TUnicodeData::EFraction: return -2; |
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|
199 |
default: return -1; // we should never come here |
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|
200 |
} |
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|
201 |
} |
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changeset
|
202 |
|
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|
203 |
struct TWidthInfo |
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|
204 |
{ |
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|
205 |
TUint iStart; |
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|
206 |
TUint iEnd; |
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|
207 |
TChar::TCjkWidth iWidth; |
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|
208 |
}; |
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|
209 |
|
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|
210 |
static const TWidthInfo TheWidthInfoTable[] = |
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|
211 |
{ |
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|
212 |
{ 0x0020, 0x007F, TChar::ENarrow }, |
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|
213 |
{ 0x00A2, 0x00A4, TChar::ENarrow }, |
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|
214 |
{ 0x00A5, 0x00A7, TChar::ENarrow }, |
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|
215 |
{ 0x00AF, 0x00B0, TChar::ENarrow }, |
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|
216 |
{ 0x00B1, 0x1100, TChar::ENeutralWidth }, |
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|
217 |
{ 0x1100, 0x1160, TChar::EWide }, |
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|
218 |
{ 0x1160, 0x2E80, TChar::ENeutralWidth }, |
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|
219 |
{ 0x2E80, 0xD7A4, TChar::EWide }, |
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|
220 |
{ 0xF900, 0xFA2E, TChar::EWide }, |
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|
221 |
{ 0xFE30, 0xFE6C, TChar::EWide }, |
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|
222 |
{ 0xFF01, 0xFF5F, TChar::EFullWidth }, |
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|
223 |
{ 0xFF61, 0xFFDD, TChar::EHalfWidth }, |
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|
224 |
{ 0xFFE0, 0xFFE7, TChar::EFullWidth }, |
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225 |
{ 0xFFE8, 0xFFEF, TChar::EHalfWidth } |
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226 |
}; |
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227 |
|
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228 |
const TInt TheWidthInfos = sizeof(TheWidthInfoTable) / sizeof(TheWidthInfoTable[0]); |
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229 |
|
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230 |
/* |
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231 |
Get the notional width used by East Asian encoding systems. No check is made that the character is assigned. |
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232 |
No separate 'ambiguous width' is returned; ambiguous characters are treated as neutral except for those |
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233 |
in the CJK range, which are treated as wide. This is a big simplification, but the cost of an exhaustive table |
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234 |
is too great to justify at the moment. |
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235 |
*/ |
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236 |
TChar::TCjkWidth TUnicode::GetCjkWidth() const |
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237 |
{ |
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238 |
const TWidthInfo* w = TheWidthInfoTable; |
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239 |
for (int i = 0; i < TheWidthInfos; i++, w++) |
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240 |
if (iCode >= w->iStart && iCode < w->iEnd) |
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241 |
return w->iWidth; |
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242 |
return TChar::ENeutralWidth; |
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243 |
} |
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244 |
|
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245 |
/* |
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246 |
Convert a Unicode character into a form most likely to be equal to another character, while |
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247 |
still preserving the essential meaning of the character. Possible folding operations include |
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248 |
converting to lower case (TChar::EFoldCase), stripping accents (TChar::EFoldAccents) and others. |
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249 |
The flag value has a default, TChar::EFoldStandard, which performs the folding operations done |
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250 |
by calling Fold functions with no flags argument, and there is also TChar::EFoldAll, |
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251 |
which performs all possible folding operations. |
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252 |
|
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253 |
Note that the difference between folding and collation is that folding is |
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254 |
* character-based |
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255 |
* biased towards yielding equality where possible |
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256 |
while collation is |
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257 |
* string-based |
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258 |
* designed to yield a non-equal ordering |
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259 |
|
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260 |
Typically, folding will be used when searching for a match, while collation will be used when |
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261 |
sorting a list. |
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262 |
*/ |
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263 |
EXPORT_C TUint TUnicode::Fold(TInt aFlags,const TUnicodeDataSet *aOverridingDataSet) const |
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264 |
{ |
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265 |
TUint result = iCode; |
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266 |
|
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267 |
/* |
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268 |
Fold CJK width variants. This only applies to characters 0xFF00 and above so we can use |
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269 |
a built-in table. |
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270 |
*/ |
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271 |
if (result >= 0xFF00 && (aFlags & TChar::EFoldWidth)) |
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272 |
result = CjkWidthFoldTable[result & 0xFF]; |
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273 |
|
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274 |
/* |
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275 |
If the character is <= 0x00FF and the flags include folding case and stripping accents, |
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276 |
and there is no overriding character data, we can use the built-in fold table. |
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277 |
*/ |
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278 |
const TUnicodeData* data = NULL; |
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279 |
if (aOverridingDataSet) |
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280 |
data = GetDataFromDataSet(*aOverridingDataSet); |
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281 |
if (data == NULL && result < 256 && |
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282 |
(aFlags & (TChar::EFoldCase | TChar::EFoldAccents)) == (TChar::EFoldCase | TChar::EFoldAccents)) |
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|
283 |
return FoldTable[result]; |
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|
284 |
|
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|
285 |
/* |
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|
286 |
Other characters have to be dealt with laboriously. |
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|
287 |
The first operations are those that, if successful, tell us that nothing more |
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|
288 |
need be done. If a value is folded to a space or a digit or converted to Katakana |
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|
289 |
it cannot have anything else done to it. |
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|
290 |
*/ |
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|
291 |
if (aFlags & TChar::EFoldKana) |
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|
292 |
{ |
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|
293 |
if ((result >= 0x3041 && result <= 0x3094) || result == 0x309D || result == 0x309E) |
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|
294 |
return result += 0x0060; |
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|
295 |
} |
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|
296 |
if (data == NULL) |
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|
297 |
data = &GetData(NULL); |
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|
298 |
if (aFlags & TChar::EFoldSpaces) |
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|
299 |
{ |
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|
300 |
if (data->iCategory == TChar::EZsCategory) |
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|
301 |
return 0x0020; |
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|
302 |
} |
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|
303 |
if (aFlags & TChar::EFoldDigits) |
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|
304 |
{ |
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|
305 |
TInt n = GetNumericValue(*data); |
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|
306 |
if (n >= 0 && n <= 9) |
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|
307 |
return 0x0030 + n; |
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|
308 |
} |
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|
309 |
|
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|
310 |
/* |
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|
311 |
The final operations are the relatively rare and expensive ones (after the special |
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|
312 |
case dealt with above) of accent removal and case conversion. |
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|
313 |
*/ |
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|
314 |
if ((aFlags & TChar::EFoldAccents) && (result < 0x2000)) |
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|
315 |
{ |
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|
316 |
/* |
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|
317 |
Throw away characters other than the first if all are accents. For the moment these |
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|
318 |
are defined as characters in the range 0x0300..0x0361. This definition may need |
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|
319 |
to be modified; or I may decide to store a flag in the decomposition table indicating |
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|
320 |
whether or not the decomposition consists of base + accent(s). |
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|
321 |
*/ |
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|
322 |
TPtrC16 decomposition; |
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|
323 |
if (::DecomposeChar(iCode, decomposition)) |
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|
324 |
{ |
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|
325 |
TBool all_accents = TRUE; |
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|
326 |
for (TInt i = 1; all_accents && i < decomposition.Length(); ++i) |
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|
327 |
{ |
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|
328 |
if (decomposition[i] < 0x0300 || decomposition[i] > 0x0361) |
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|
329 |
all_accents = FALSE; |
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|
330 |
} |
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|
331 |
if (all_accents) |
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|
332 |
result = decomposition[0]; |
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|
333 |
} |
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|
334 |
} |
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|
335 |
|
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|
336 |
if (aFlags & TChar::EFoldCase) |
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|
337 |
{ |
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338 |
if (aOverridingDataSet == NULL && result < 256) |
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result = FoldTable[result]; |
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340 |
else |
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341 |
result = TUnicode(result).GetLowerCase(aOverridingDataSet); |
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342 |
} |
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343 |
|
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344 |
return result; |
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345 |
} |
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346 |
|
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347 |
/* |
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348 |
Compare two Unicode strings naively by Unicode value. This is NOT the same as a comparison |
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349 |
of null-terminated strings; the strings can contain null characters (Unicode 0x0000) and they |
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350 |
compare greater than no character. This means that the string { 0x0001 0x0000 } always comes |
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351 |
after the string { 0x0001 }. |
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352 |
|
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353 |
This function exists to make it easier to search tables of Unicode strings (like the composition |
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354 |
buffer) using the binary chop method. It is also used by READTYPE when sorting the compose table. |
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355 |
|
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356 |
The return values are: 0 for equality, < 0 if aString1 < aString2, > 0 if aString1 > aString2. |
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357 |
*/ |
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358 |
TInt TUnicode::Compare(const TUint16 *aString1,TInt aLength1,const TUint16 *aString2,TInt aLength2) |
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359 |
{ |
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360 |
for (TInt i = 0; i < aLength1 || i < aLength2; i++, aString1++, aString2++) |
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361 |
{ |
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362 |
TInt x = i < aLength1 ? *aString1 : -1; |
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363 |
TInt y = i < aLength2 ? *aString2 : -1; |
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364 |
if (x != y) |
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365 |
return x - y; |
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366 |
} |
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367 |
return 0; |
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Catch up of Symbian tools for @1627812
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368 |
} |
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Catch up of Symbian tools for @1627812
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|
369 |