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Fix for bug 68824 (XMLParser::getDocumentFromURI returns empty documents for missing pages). r=Pike, sr=bz.

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peterv%propagandism.org 2005-08-31 12:01:29 +00:00
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Коммит c2a93e1136
1 изменённых файлов: 0 добавлений и 452 удалений
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452
extensions/transformiix/source/xml/parser/txXMLParser.cpp
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@ -1,452 +0,0 @@
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is TransforMiiX XSLT processor code.
*
* The Initial Developer of the Original Code is
* The MITRE Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Tom Kneeland <tomk@mitre.org> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "txXMLParser.h"
#include "txURIUtils.h"
#include "txXPathTreeWalker.h"
#ifndef TX_EXE
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsISyncLoadDOMService.h"
#include "nsNetUtil.h"
#else
#include "expat_config.h"
#include "expat.h"
#include "XMLUtils.h"
#endif
#ifdef TX_EXE
/**
* Implementation of an In-Memory DOM based XML parser. The actual XML
* parsing is provided by EXPAT.
*/
class txXMLParser
{
public:
nsresult parse(istream& aInputStream, const nsAString& aUri,
txXPathNode** aResultDoc);
const nsAString& getErrorString();
/**
* Expat handlers
*/
int StartElement(const XML_Char *aName, const XML_Char **aAtts);
int EndElement(const XML_Char* aName);
void CharacterData(const XML_Char* aChars, int aLength);
void Comment(const XML_Char* aChars);
int ProcessingInstruction(const XML_Char *aTarget, const XML_Char *aData);
int ExternalEntityRef(const XML_Char *aContext, const XML_Char *aBase,
const XML_Char *aSystemId,
const XML_Char *aPublicId);
protected:
void createErrorString();
nsString mErrorString;
Document* mDocument;
Node* mCurrentNode;
XML_Parser mExpatParser;
};
#endif
nsresult
txParseDocumentFromURI(const nsAString& aHref, const nsAString& aReferrer,
const txXPathNode& aLoader, nsAString& aErrMsg,
txXPathNode** aResult)
{
NS_ENSURE_ARG_POINTER(aResult);
*aResult = nsnull;
#ifndef TX_EXE
nsCOMPtr<nsIURI> documentURI;
nsresult rv = NS_NewURI(getter_AddRefs(documentURI), aHref);
NS_ENSURE_SUCCESS(rv, rv);
nsIDocument* loaderDocument = txXPathNativeNode::getDocument(aLoader);
nsCOMPtr<nsILoadGroup> loadGroup = loaderDocument->GetDocumentLoadGroup();
nsIURI *loaderUri = loaderDocument->GetDocumentURI();
NS_ENSURE_TRUE(loaderUri, NS_ERROR_FAILURE);
nsCOMPtr<nsIChannel> channel;
rv = NS_NewChannel(getter_AddRefs(channel), documentURI, nsnull,
loadGroup);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIHttpChannel> http = do_QueryInterface(channel);
if (http) {
nsCOMPtr<nsIURI> refUri;
NS_NewURI(getter_AddRefs(refUri), aReferrer);
if (refUri) {
http->SetReferrer(refUri);
}
http->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
NS_LITERAL_CSTRING("text/xml,application/xml,application/xhtml+xml,*/*;q=0.1"),
PR_FALSE);
}
nsCOMPtr<nsISyncLoadDOMService> loader =
do_GetService("@mozilla.org/content/syncload-dom-service;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
// Raw pointer, we want the resulting txXPathNode to hold a reference to
// the document.
nsIDOMDocument* theDocument = nsnull;
rv = loader->LoadDocumentAsXML(channel, loaderUri, &theDocument);
if (NS_FAILED(rv) || !theDocument) {
aErrMsg.Append(NS_LITERAL_STRING("Document load of ") +
aHref + NS_LITERAL_STRING(" failed."));
return rv;
}
*aResult = txXPathNativeNode::createXPathNode(theDocument);
if (!*aResult) {
NS_RELEASE(theDocument);
return NS_ERROR_FAILURE;
}
return NS_OK;
#else
istream* xslInput = URIUtils::getInputStream(aHref, aErrMsg);
if (!xslInput) {
return NS_ERROR_FAILURE;
}
return txParseFromStream(*xslInput, aHref, aErrMsg, aResult);
#endif
}
#ifdef TX_EXE
nsresult
txParseFromStream(istream& aInputStream, const nsAString& aUri,
nsAString& aErrorString, txXPathNode** aResult)
{
NS_ENSURE_ARG_POINTER(aResult);
txXMLParser parser;
nsresult rv = parser.parse(aInputStream, aUri, aResult);
aErrorString = parser.getErrorString();
return rv;
}
/**
* expat C stub handlers
*/
// shortcut macro for redirection into txXMLParser method calls
#define TX_XMLPARSER(_userData) NS_STATIC_CAST(txXMLParser*, _userData)
#define TX_ENSURE_DATA(_userData) \
PR_BEGIN_MACRO \
if (!aUserData) { \
NS_WARNING("no userData in comment handler"); \
return; \
} \
PR_END_MACRO
PR_STATIC_CALLBACK(void)
startElement(void *aUserData, const XML_Char *aName, const XML_Char **aAtts)
{
TX_ENSURE_DATA(aUserData);
TX_XMLPARSER(aUserData)->StartElement(aName, aAtts);
}
PR_STATIC_CALLBACK(void)
endElement(void *aUserData, const XML_Char* aName)
{
TX_ENSURE_DATA(aUserData);
TX_XMLPARSER(aUserData)->EndElement(aName);
}
PR_STATIC_CALLBACK(void)
charData(void* aUserData, const XML_Char* aChars, int aLength)
{
TX_ENSURE_DATA(aUserData);
TX_XMLPARSER(aUserData)->CharacterData(aChars, aLength);
}
PR_STATIC_CALLBACK(void)
commentHandler(void* aUserData, const XML_Char* aChars)
{
TX_ENSURE_DATA(aUserData);
TX_XMLPARSER(aUserData)->Comment(aChars);
}
PR_STATIC_CALLBACK(void)
piHandler(void *aUserData, const XML_Char *aTarget, const XML_Char *aData)
{
TX_ENSURE_DATA(aUserData);
TX_XMLPARSER(aUserData)->ProcessingInstruction(aTarget, aData);
}
PR_STATIC_CALLBACK(int)
externalEntityRefHandler(XML_Parser aParser,
const XML_Char *aContext,
const XML_Char *aBase,
const XML_Char *aSystemId,
const XML_Char *aPublicId)
{
// aParser is aUserData is the txXMLParser,
// we set that in txXMLParser::parse
NS_ENSURE_TRUE(aParser, XML_ERROR_NONE);
return ((txXMLParser*)aParser)->ExternalEntityRef(aContext, aBase,
aSystemId, aPublicId);
}
/**
* Parses the given input stream and returns a DOM Document.
* A NULL pointer will be returned if errors occurred
*/
nsresult
txXMLParser::parse(istream& aInputStream, const nsAString& aUri,
txXPathNode** aResultDoc)
{
mErrorString.Truncate();
*aResultDoc = nsnull;
if (!aInputStream) {
mErrorString.AppendLiteral("unable to parse xml: invalid or unopen stream encountered.");
return NS_ERROR_FAILURE;
}
static const XML_Memory_Handling_Suite memsuite = {
(void *(*)(size_t))PR_Malloc,
(void *(*)(void *, size_t))PR_Realloc,
PR_Free
};
static const PRUnichar expatSeparator = kExpatSeparatorChar;
mExpatParser = XML_ParserCreate_MM(nsnull, &memsuite, &expatSeparator);
if (!mExpatParser) {
return NS_ERROR_OUT_OF_MEMORY;
}
mDocument = new Document();
if (!mDocument) {
XML_ParserFree(mExpatParser);
return NS_ERROR_OUT_OF_MEMORY;
}
mDocument->documentBaseURI = aUri;
mCurrentNode = mDocument;
XML_SetReturnNSTriplet(mExpatParser, XML_TRUE);
XML_SetUserData(mExpatParser, this);
XML_SetElementHandler(mExpatParser, startElement, endElement);
XML_SetCharacterDataHandler(mExpatParser, charData);
XML_SetProcessingInstructionHandler(mExpatParser, piHandler);
XML_SetCommentHandler(mExpatParser, commentHandler);
#ifdef XML_DTD
XML_SetParamEntityParsing(mExpatParser, XML_PARAM_ENTITY_PARSING_ALWAYS);
#endif
XML_SetExternalEntityRefHandler(mExpatParser, externalEntityRefHandler);
XML_SetExternalEntityRefHandlerArg(mExpatParser, this);
XML_SetBase(mExpatParser,
(const XML_Char*)(PromiseFlatString(aUri).get()));
const int bufferSize = 1024;
char buf[bufferSize];
PRBool done;
do {
aInputStream.read(buf, bufferSize);
done = aInputStream.eof();
if (!XML_Parse(mExpatParser, buf, aInputStream.gcount(), done)) {
createErrorString();
done = MB_TRUE;
delete mDocument;
mDocument = nsnull;
}
} while (!done);
aInputStream.clear();
// clean up
XML_ParserFree(mExpatParser);
// ownership to the caller
*aResultDoc = txXPathNativeNode::createXPathNode(mDocument);
mDocument = nsnull;
return *aResultDoc ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
const nsAString&
txXMLParser::getErrorString()
{
return mErrorString;
}
int
txXMLParser::StartElement(const XML_Char *aName, const XML_Char **aAtts)
{
nsCOMPtr<nsIAtom> prefix, localName;
PRInt32 nsID;
XMLUtils::splitExpatName(aName, getter_AddRefs(prefix),
getter_AddRefs(localName), &nsID);
Element* newElement = mDocument->createElementNS(prefix, localName, nsID);
if (!newElement) {
return XML_ERROR_NO_MEMORY;
}
const XML_Char** theAtts = aAtts;
while (*theAtts) {
XMLUtils::splitExpatName(*theAtts++, getter_AddRefs(prefix),
getter_AddRefs(localName), &nsID);
nsDependentString attValue(*theAtts++);
nsresult rv = newElement->appendAttributeNS(prefix, localName, nsID,
attValue);
if (NS_FAILED(rv)) {
return XML_ERROR_NO_MEMORY;
}
}
int idx;
if ((idx = XML_GetIdAttributeIndex(mExpatParser)) > -1) {
nsDependentString idName((const PRUnichar*)*(aAtts + idx));
nsDependentString idValue((const PRUnichar*)*(aAtts + idx + 1));
// make sure IDs are unique
if (!idValue.IsEmpty()) {
mDocument->setElementID(idValue, newElement);
}
}
mCurrentNode->appendChild(newElement);
mCurrentNode = newElement;
return XML_ERROR_NONE;
}
int
txXMLParser::EndElement(const XML_Char* aName)
{
if (mCurrentNode->getParentNode()) {
mCurrentNode = mCurrentNode->getParentNode();
}
return XML_ERROR_NONE;
}
void
txXMLParser::CharacterData(const XML_Char* aChars, int aLength)
{
Node* prevSib = mCurrentNode->getLastChild();
const PRUnichar* pChars = NS_STATIC_CAST(const PRUnichar*, aChars);
if (prevSib && prevSib->getNodeType() == Node::TEXT_NODE) {
NS_STATIC_CAST(NodeDefinition*, prevSib)->appendData(pChars, aLength);
}
else {
// aChars is not null-terminated so we use Substring here.
Node* node = mDocument->createTextNode(Substring(pChars,
pChars + aLength));
mCurrentNode->appendChild(node);
}
}
void
txXMLParser::Comment(const XML_Char* aChars)
{
Node* node = mDocument->createComment(
nsDependentString(NS_STATIC_CAST(const PRUnichar*, aChars)));
mCurrentNode->appendChild(node);
}
int
txXMLParser::ProcessingInstruction(const XML_Char *aTarget,
const XML_Char *aData)
{
nsCOMPtr<nsIAtom> target = do_GetAtom(aTarget);
nsDependentString data((const PRUnichar*)aData);
Node* node = mDocument->createProcessingInstruction(target, data);
mCurrentNode->appendChild(node);
return XML_ERROR_NONE;
}
int
txXMLParser::ExternalEntityRef(const XML_Char *aContext,
const XML_Char *aBase,
const XML_Char *aSystemId,
const XML_Char *aPublicId)
{
if (aPublicId) {
// not supported, this is "http://some.site.net/foo.dtd" stuff
return XML_ERROR_EXTERNAL_ENTITY_HANDLING;
}
nsAutoString absUrl;
URIUtils::resolveHref(nsDependentString((PRUnichar*)aSystemId),
nsDependentString((PRUnichar*)aBase), absUrl);
istream* extInput = URIUtils::getInputStream(absUrl, mErrorString);
if (!extInput) {
return XML_ERROR_EXTERNAL_ENTITY_HANDLING;
}
XML_Parser parent = mExpatParser;
mExpatParser =
XML_ExternalEntityParserCreate(mExpatParser, aContext, nsnull);
if (!mExpatParser) {
mExpatParser = parent;
delete extInput;
return XML_ERROR_EXTERNAL_ENTITY_HANDLING;
}
XML_SetBase(mExpatParser, absUrl.get());
const int bufSize = 1024;
char buffer[bufSize];
int result;
PRBool done;
do {
extInput->read(buffer, bufSize);
done = extInput->eof();
if (!(result =
XML_Parse(mExpatParser, buffer, extInput->gcount(), done))) {
createErrorString();
mErrorString.Append(PRUnichar('\n'));
done = MB_TRUE;
}
} while (!done);
delete extInput;
XML_ParserFree(mExpatParser);
mExpatParser = parent;
return result;
}
void
txXMLParser::createErrorString()
{
XML_Error errCode = XML_GetErrorCode(mExpatParser);
mErrorString.AppendWithConversion(XML_ErrorString(errCode));
mErrorString.AppendLiteral(" at line ");
mErrorString.AppendInt(XML_GetCurrentLineNumber(mExpatParser));
mErrorString.AppendLiteral(" in ");
mErrorString.Append((const PRUnichar*)XML_GetBase(mExpatParser));
}
#endif