author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 09:29:21 +0200 | |
changeset 0 | e35f40988205 |
permissions | -rw-r--r-- |
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// Copyright (c) 2001-2009 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 "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-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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// MDXMLEntityConverter.cpp |
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// @file |
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// This class represents a generic entity converter for an XML parser or composer. |
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// |
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// |
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#include <f32file.h> |
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#include <stringpool.h> |
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#include <gmxmlconstants.h> |
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#include <gmxmlcomposer.h> |
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#include <gmxmlentityconverter.h> |
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#include "xmlentityreferences.h" |
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const TInt KMaxBuiltinEntityLength = 20; |
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// |
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// CMDXMLEntityConverter // |
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// |
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EXPORT_C CMDXMLEntityConverter::CMDXMLEntityConverter() |
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// |
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// Constructor |
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// |
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{ |
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} |
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EXPORT_C CMDXMLEntityConverter::~CMDXMLEntityConverter() |
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{ |
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} |
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//================================================================================== |
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TInt CMDXMLEntityConverter::EntityToTextL(TDes& aTextToConvert) |
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// |
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// Takes a block of text and converts any entity references found to the |
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// appropriate text. Because built-in and character entity references are |
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// longer than the replacement text, this takes place in-situ. |
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// @param aTextToConvert Text to be converted - replacement text goes |
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// out in the same |
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// |
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{ |
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TInt error = KErrNone; |
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TInt beginEntityOffset = 0; |
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TInt beginSearchOffset = 0; |
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TPtrC searchPtr = TPtrC(aTextToConvert); |
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// Need to convert all entity refs in this bit of data. Don't want to convert |
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// things more than once so we keep a marker and move it on so each time round |
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// the loop we start looking for entity references after the end of the previous |
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// one. |
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while((beginEntityOffset = searchPtr.Locate('&')) != KErrNotFound) |
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{ |
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searchPtr.Set(aTextToConvert.Mid(beginSearchOffset + beginEntityOffset)); |
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TInt endEntityOffset = searchPtr.Locate(';'); |
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if(endEntityOffset == KErrNotFound) |
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{ |
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// No point continuing past here - even if we find more & they can't be |
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// terminated either. |
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error = KErrXMLBadEntity; |
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break; |
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} |
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endEntityOffset += beginEntityOffset; |
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// Can't construct a modifiable descriptor that's just part of another one. Looks |
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// like we need to copy the section containing the reference and twiddle that, then |
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// copy the result back if it's valid. |
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HBufC* entityRef = searchPtr.Mid(0, (endEntityOffset - beginEntityOffset)+1).AllocLC(); |
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TInt convertErr = KErrNone; |
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TPtr entityRefDes = entityRef->Des(); |
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if((convertErr = ConvertEntityRefL(entityRefDes)) == KErrNotSupported) |
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{ |
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convertErr = DTDEntityToText(entityRefDes); |
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} |
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|
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if(!convertErr) |
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{ |
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// We need to replace this section of aTextToConvert with entityRefDes |
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// we don't know whether DTDEntityToText has actually changed anything - |
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// because of constraints on the published behaviour of DTDEntityToText we |
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// can't compel DTDEntityToText to return KErrUnsupported - it thinks it |
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// could be dealing with multiple entity refs and just cos it doesn't support |
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// one of them doesn't mean it doesn't support the rest. Probably true that |
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// the entity ref will be a builtin, so won't need to call DTDEntityToText |
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// anyway. ConvertEntityRefL will return KErrNone only if it converted so |
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// we probably won't be copying things gratuitously in the common case. |
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aTextToConvert.Replace(beginEntityOffset + beginSearchOffset, (endEntityOffset - beginEntityOffset)+1, entityRefDes); |
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} |
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else |
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{ |
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error = KErrXMLBadEntity; |
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} |
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105 |
|
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106 |
beginSearchOffset += beginEntityOffset + entityRefDes.Length(); |
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searchPtr.Set(aTextToConvert.Mid(beginSearchOffset)); |
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108 |
CleanupStack::PopAndDestroy(entityRef); |
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109 |
} |
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110 |
|
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111 |
return error; |
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112 |
} |
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113 |
|
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114 |
//================================================================================== |
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115 |
|
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116 |
EXPORT_C TInt CMDXMLEntityConverter::OutputComposedTextL( CMDXMLComposer* aComposer, const TDesC& aTextToConvert) |
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117 |
// |
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118 |
// Outputs a block of text to a composer with offending characters replaced by |
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119 |
// entity references. |
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120 |
// @param aComposer the composer to be used for output |
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121 |
// @param aTextToConvert The text to be converted. |
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// @return Returns KErrNone if successful or a file write error |
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// @leave can Leave due to OOM |
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124 |
// |
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125 |
{ |
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126 |
TBuf<1> oneChar; |
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TInt offset = 0; |
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TInt error = KErrNone; |
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TInt textLen = aTextToConvert.Length(); |
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130 |
|
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while(error == KErrNone && (offset < textLen)) |
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132 |
{ |
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oneChar = aTextToConvert.Mid(offset, 1); |
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offset++; |
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135 |
|
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136 |
// Built in entities |
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137 |
RStringPool pool; |
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CleanupClosePushL(pool); |
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139 |
pool.OpenL(XMLEntityReferences::Table); |
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140 |
|
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141 |
|
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142 |
TBool found = EFalse; |
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143 |
for (TUint i=0; i<XMLEntityReferences::Table.iCount; i++) |
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144 |
{ |
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RStringF entity = pool.StringF(i, XMLEntityReferences::Table); |
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146 |
TBuf<KMaxBuiltinEntityLength> buf; |
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147 |
buf.Copy(entity.DesC()); |
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148 |
TLex string(buf); |
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149 |
|
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150 |
TPtrC entityRef = string.NextToken(); |
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151 |
if(oneChar.Compare(string.NextToken()) == 0) |
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152 |
{ |
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error = aComposer->OutputDataL(entityRef); |
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154 |
found = ETrue; |
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155 |
break; |
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156 |
} |
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157 |
|
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158 |
} |
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159 |
|
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160 |
CleanupStack::PopAndDestroy(); // close pool |
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161 |
|
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162 |
if(!found) |
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163 |
error = aComposer->OutputDataL(oneChar); |
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164 |
else |
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165 |
found = EFalse; |
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166 |
|
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167 |
} |
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168 |
|
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169 |
return error; |
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170 |
} |
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171 |
|
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172 |
//================================================================================== |
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173 |
|
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174 |
TInt CMDXMLEntityConverter::DTDEntityToText(TDes& /*aTextToConvert*/) |
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175 |
// |
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176 |
// DTD Specific entity to text converter |
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// Takes a block of text and converts any entity references found to the |
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// appropriate text. We hope that this can happen in-situ. |
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179 |
// @param aTextToConvert Text to be converted - replacement text goes |
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180 |
// out in the same |
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181 |
// |
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182 |
{ // Nothing in the generic case. |
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183 |
return KErrNone; |
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184 |
} |
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185 |
|
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186 |
//================================================================================== |
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187 |
|
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188 |
TInt CMDXMLEntityConverter::ConvertEntityRefL(TDes& aTextToConvert) |
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189 |
{ |
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190 |
#ifdef _DEBUG |
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191 |
_LIT(KEntityConverter, "GMXML Entity Converter"); |
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192 |
__ASSERT_ALWAYS(aTextToConvert.Length() > 1, User::Panic(KEntityConverter, KErrArgument)); |
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193 |
#endif |
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194 |
|
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195 |
TInt err = KErrNotSupported; |
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196 |
TBool charRef = EFalse; |
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197 |
TInt idLen = 0; |
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198 |
TRadix elementRadix = EDecimal; |
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199 |
|
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200 |
if(aTextToConvert.Find(KXMLHexidecimalId) != KErrNotFound) |
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201 |
{ |
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202 |
charRef = ETrue; |
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203 |
idLen = TPtrC(KXMLHexidecimalId).Length(); |
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204 |
elementRadix = EHex; |
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205 |
} |
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206 |
else if(aTextToConvert.Find(KXMLDecimalId) != KErrNotFound) |
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207 |
{ |
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208 |
charRef = ETrue; |
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209 |
idLen = TPtrC(KXMLDecimalId).Length(); |
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210 |
elementRadix = EDecimal; |
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211 |
} |
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212 |
|
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if(charRef) |
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{ |
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// Character entities |
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/* |
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algorithm explanation: |
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The entity reference in the descriptor holding the string is known by it's positions. |
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offset = offset to beginning of '&#x' from start of supplied descriptor. (0 indicates start of descriptor) |
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entitylen = offset to ';' character from the start of the entity reference. |
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221 |
|
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the length of the entity preamble (&#x in this case) is known. |
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|
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The algorithm assigns the required portion of the descriptor to a TLex16 object so that the |
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value of the code can be read out. |
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|
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The math for the assign is as follows: |
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start of number = offset + length of preamble |
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num of characters to take = entityLen - length of preamble |
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230 |
|
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The entity is then deleted from the string, and the new code is inserted in the |
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correct location. |
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The deleted characters are 'entityLen' charcters from 'offset'. |
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|
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235 |
|
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e.g. for the string <a href="http://www.symbian.com"> |
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237 |
|
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offset = 16 |
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entitylen = 5 |
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string assigned to lexer = '77' |
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code = 0x77 (extracted from lexer) |
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|
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descriptor after delete operation: |
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244 |
|
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<a href="http://&ww.symbian.com"> |
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|
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array dereference fills in the descriptor such that the ampersand is replaced. |
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<a href="http://www.symbian.com"> |
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*/ |
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TInt entityLen = aTextToConvert.Length(); |
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|
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TLex16 element; |
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element.Assign(aTextToConvert.Mid(idLen, (entityLen - idLen))); |
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|
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TUint16 code; |
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err = element.Val(code, elementRadix); |
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|
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if(!err) |
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{ |
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aTextToConvert.Delete(1, entityLen); |
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aTextToConvert[0] = code; |
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} |
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} |
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else |
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{ |
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// Built in entities |
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RStringPool pool; |
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CleanupClosePushL(pool); |
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pool.OpenL(XMLEntityReferences::Table); |
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|
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|
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for (TUint i=0; (i<XMLEntityReferences::Table.iCount) && (err != KErrNone); i++) |
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{ |
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RStringF entity = pool.StringF(i, XMLEntityReferences::Table); |
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TBuf<KMaxBuiltinEntityLength> buf; |
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buf.Copy(entity.DesC()); |
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TLex string(buf); |
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|
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TPtrC token = string.NextToken(); |
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TInt offset; |
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if((offset = aTextToConvert.Find(token)) != KErrNotFound) |
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{ |
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aTextToConvert.Replace(offset, token.Length(), string.NextToken()); |
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err = KErrNone; |
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} |
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} |
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CleanupStack::PopAndDestroy(); //close pool |
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} |
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|
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return err; |
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} |
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|
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293 |
// End Of File |