mirror of
https://github.com/rn10950/RetroZilla.git
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427 lines
13 KiB
C++
427 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is TransforMiiX XSLT processor code.
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*
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* The Initial Developer of the Original Code is
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* The MITRE Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Tom Kneeland <tomk@mitre.org> (Original Author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "txXMLParser.h"
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#include "txURIUtils.h"
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#include "txXPathTreeWalker.h"
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#ifndef TX_EXE
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#include "nsIDocument.h"
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#include "nsIDOMDocument.h"
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#include "nsISyncLoadDOMService.h"
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#include "nsNetUtil.h"
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#else
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#include "expat_config.h"
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#include "expat.h"
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#endif
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#ifdef TX_EXE
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/**
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* Implementation of an In-Memory DOM based XML parser. The actual XML
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* parsing is provided by EXPAT.
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*/
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class txXMLParser
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{
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public:
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nsresult parse(istream& aInputStream, const nsAString& aUri,
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txXPathNode** aResultDoc);
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const nsAString& getErrorString();
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/**
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* Expat handlers
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*/
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int StartElement(const XML_Char *aName, const XML_Char **aAtts);
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int EndElement(const XML_Char* aName);
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void CharacterData(const XML_Char* aChars, int aLength);
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void Comment(const XML_Char* aChars);
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int ProcessingInstruction(const XML_Char *aTarget, const XML_Char *aData);
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int ExternalEntityRef(const XML_Char *aContext, const XML_Char *aBase,
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const XML_Char *aSystemId,
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const XML_Char *aPublicId);
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protected:
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void createErrorString();
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nsString mErrorString;
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Document* mDocument;
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Node* mCurrentNode;
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XML_Parser mExpatParser;
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};
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#endif
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nsresult
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txParseDocumentFromURI(const nsAString& aHref, const txXPathNode& aLoader,
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nsAString& aErrMsg, txXPathNode** aResult)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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*aResult = nsnull;
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#ifndef TX_EXE
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nsCOMPtr<nsIURI> documentURI;
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nsresult rv = NS_NewURI(getter_AddRefs(documentURI), aHref);
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NS_ENSURE_SUCCESS(rv, rv);
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nsIDocument* loaderDocument = txXPathNativeNode::getDocument(aLoader);
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nsCOMPtr<nsILoadGroup> loadGroup = loaderDocument->GetDocumentLoadGroup();
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nsIURI *loaderUri = loaderDocument->GetDocumentURI();
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NS_ENSURE_TRUE(loaderUri, NS_ERROR_FAILURE);
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nsCOMPtr<nsIChannel> channel;
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rv = NS_NewChannel(getter_AddRefs(channel), documentURI, nsnull,
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loadGroup);
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsIHttpChannel> http = do_QueryInterface(channel);
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if (http) {
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http->SetReferrer(loaderUri);
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}
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nsCOMPtr<nsISyncLoadDOMService> loader =
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do_GetService("@mozilla.org/content/syncload-dom-service;1", &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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// Raw pointer, we want the resulting txXPathNode to hold a reference to
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// the document.
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nsIDOMDocument* theDocument = nsnull;
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rv = loader->LoadDocumentAsXML(channel, loaderUri, &theDocument);
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if (NS_FAILED(rv)) {
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aErrMsg.Append(NS_LITERAL_STRING("Document load of ") +
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aHref + NS_LITERAL_STRING(" failed."));
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return NS_FAILED(rv) ? rv : NS_ERROR_FAILURE;
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}
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*aResult = txXPathNativeNode::createXPathNode(theDocument);
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if (!*aResult) {
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NS_RELEASE(theDocument);
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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#else
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istream* xslInput = URIUtils::getInputStream(aHref, aErrMsg);
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if (!xslInput) {
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return NS_ERROR_FAILURE;
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}
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return txParseFromStream(*xslInput, aHref, aErrMsg, aResult);
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#endif
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}
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#ifdef TX_EXE
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nsresult
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txParseFromStream(istream& aInputStream, const nsAString& aUri,
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nsAString& aErrorString, txXPathNode** aResult)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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txXMLParser parser;
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nsresult rv = parser.parse(aInputStream, aUri, aResult);
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aErrorString = parser.getErrorString();
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return rv;
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}
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/**
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* expat C stub handlers
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*/
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// shortcut macro for redirection into txXMLParser method calls
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#define TX_XMLPARSER(_userData) NS_STATIC_CAST(txXMLParser*, _userData)
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#define TX_ENSURE_DATA(_userData) \
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PR_BEGIN_MACRO \
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if (!aUserData) { \
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NS_WARNING("no userData in comment handler"); \
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return; \
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} \
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PR_END_MACRO
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PR_STATIC_CALLBACK(void)
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startElement(void *aUserData, const XML_Char *aName, const XML_Char **aAtts)
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{
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TX_ENSURE_DATA(aUserData);
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TX_XMLPARSER(aUserData)->StartElement(aName, aAtts);
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}
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PR_STATIC_CALLBACK(void)
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endElement(void *aUserData, const XML_Char* aName)
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{
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TX_ENSURE_DATA(aUserData);
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TX_XMLPARSER(aUserData)->EndElement(aName);
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}
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PR_STATIC_CALLBACK(void)
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charData(void* aUserData, const XML_Char* aChars, int aLength)
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{
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TX_ENSURE_DATA(aUserData);
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TX_XMLPARSER(aUserData)->CharacterData(aChars, aLength);
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}
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PR_STATIC_CALLBACK(void)
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commentHandler(void* aUserData, const XML_Char* aChars)
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{
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TX_ENSURE_DATA(aUserData);
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TX_XMLPARSER(aUserData)->Comment(aChars);
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}
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PR_STATIC_CALLBACK(void)
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piHandler(void *aUserData, const XML_Char *aTarget, const XML_Char *aData)
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{
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TX_ENSURE_DATA(aUserData);
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TX_XMLPARSER(aUserData)->ProcessingInstruction(aTarget, aData);
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}
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PR_STATIC_CALLBACK(int)
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externalEntityRefHandler(XML_Parser aParser,
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const XML_Char *aContext,
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const XML_Char *aBase,
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const XML_Char *aSystemId,
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const XML_Char *aPublicId)
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{
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// aParser is aUserData is the txXMLParser,
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// we set that in txXMLParser::parse
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NS_ENSURE_TRUE(aParser, XML_ERROR_NONE);
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return ((txXMLParser*)aParser)->ExternalEntityRef(aContext, aBase,
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aSystemId, aPublicId);
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}
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/**
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* Parses the given input stream and returns a DOM Document.
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* A NULL pointer will be returned if errors occurred
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*/
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nsresult
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txXMLParser::parse(istream& aInputStream, const nsAString& aUri,
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txXPathNode** aResultDoc)
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{
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mErrorString.Truncate();
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*aResultDoc = nsnull;
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if (!aInputStream) {
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mErrorString.AppendLiteral("unable to parse xml: invalid or unopen stream encountered.");
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return NS_ERROR_FAILURE;
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}
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mExpatParser = XML_ParserCreate(nsnull);
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if (!mExpatParser) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mDocument = new Document();
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if (!mDocument) {
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XML_ParserFree(mExpatParser);
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mDocument->documentBaseURI = aUri;
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mCurrentNode = mDocument;
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XML_SetUserData(mExpatParser, this);
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XML_SetElementHandler(mExpatParser, startElement, endElement);
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XML_SetCharacterDataHandler(mExpatParser, charData);
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XML_SetProcessingInstructionHandler(mExpatParser, piHandler);
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XML_SetCommentHandler(mExpatParser, commentHandler);
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#ifdef XML_DTD
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XML_SetParamEntityParsing(mExpatParser, XML_PARAM_ENTITY_PARSING_ALWAYS);
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#endif
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XML_SetExternalEntityRefHandler(mExpatParser, externalEntityRefHandler);
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XML_SetExternalEntityRefHandlerArg(mExpatParser, this);
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XML_SetBase(mExpatParser,
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(const XML_Char*)(PromiseFlatString(aUri).get()));
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const int bufferSize = 1024;
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char buf[bufferSize];
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PRBool done;
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do {
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aInputStream.read(buf, bufferSize);
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done = aInputStream.eof();
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if (!XML_Parse(mExpatParser, buf, aInputStream.gcount(), done)) {
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createErrorString();
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done = MB_TRUE;
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delete mDocument;
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mDocument = nsnull;
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}
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} while (!done);
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aInputStream.clear();
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// clean up
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XML_ParserFree(mExpatParser);
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// ownership to the caller
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*aResultDoc = txXPathNativeNode::createXPathNode(mDocument);
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mDocument = nsnull;
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return *aResultDoc ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
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}
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const nsAString&
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txXMLParser::getErrorString()
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{
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return mErrorString;
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}
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int
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txXMLParser::StartElement(const XML_Char *aName, const XML_Char **aAtts)
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{
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const XML_Char** theAtts = aAtts;
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Element* newElement =
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mDocument->createElement(nsDependentString((const PRUnichar*)aName));
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if (!newElement) {
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return XML_ERROR_NO_MEMORY;
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}
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while (*theAtts) {
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nsDependentString attName((const PRUnichar*)*theAtts++);
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nsDependentString attValue((const PRUnichar*)*theAtts++);
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newElement->setAttribute(attName, attValue);
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}
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int idx;
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if ((idx = XML_GetIdAttributeIndex(mExpatParser)) > -1) {
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nsDependentString idName((const PRUnichar*)*(aAtts + idx));
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nsDependentString idValue((const PRUnichar*)*(aAtts + idx + 1));
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// make sure IDs are unique
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if (!idValue.IsEmpty()) {
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mDocument->setElementID(idValue, newElement);
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}
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}
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mCurrentNode->appendChild(newElement);
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mCurrentNode = newElement;
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return XML_ERROR_NONE;
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}
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int
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txXMLParser::EndElement(const XML_Char* aName)
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{
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if (mCurrentNode->getParentNode()) {
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mCurrentNode = mCurrentNode->getParentNode();
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}
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return XML_ERROR_NONE;
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}
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void
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txXMLParser::CharacterData(const XML_Char* aChars, int aLength)
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{
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Node* prevSib = mCurrentNode->getLastChild();
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const PRUnichar* pChars = NS_STATIC_CAST(const PRUnichar*, aChars);
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if (prevSib && prevSib->getNodeType() == Node::TEXT_NODE) {
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NS_STATIC_CAST(NodeDefinition*, prevSib)->appendData(pChars, aLength);
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}
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else {
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// aChars is not null-terminated so we use Substring here.
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Node* node = mDocument->createTextNode(Substring(pChars,
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pChars + aLength));
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mCurrentNode->appendChild(node);
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}
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}
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void
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txXMLParser::Comment(const XML_Char* aChars)
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{
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Node* node = mDocument->createComment(
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nsDependentString(NS_STATIC_CAST(const PRUnichar*, aChars)));
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mCurrentNode->appendChild(node);
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}
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int
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txXMLParser::ProcessingInstruction(const XML_Char *aTarget,
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const XML_Char *aData)
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{
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nsDependentString target((const PRUnichar*)aTarget);
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nsDependentString data((const PRUnichar*)aData);
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Node* node = mDocument->createProcessingInstruction(target, data);
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mCurrentNode->appendChild(node);
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return XML_ERROR_NONE;
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}
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int
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txXMLParser::ExternalEntityRef(const XML_Char *aContext,
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const XML_Char *aBase,
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const XML_Char *aSystemId,
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const XML_Char *aPublicId)
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{
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if (aPublicId) {
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// not supported, this is "http://some.site.net/foo.dtd" stuff
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return XML_ERROR_EXTERNAL_ENTITY_HANDLING;
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}
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nsAutoString absUrl;
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URIUtils::resolveHref(nsDependentString((PRUnichar*)aSystemId),
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nsDependentString((PRUnichar*)aBase), absUrl);
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istream* extInput = URIUtils::getInputStream(absUrl, mErrorString);
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if (!extInput) {
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return XML_ERROR_EXTERNAL_ENTITY_HANDLING;
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}
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XML_Parser parent = mExpatParser;
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mExpatParser =
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XML_ExternalEntityParserCreate(mExpatParser, aContext, nsnull);
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if (!mExpatParser) {
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mExpatParser = parent;
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delete extInput;
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return XML_ERROR_EXTERNAL_ENTITY_HANDLING;
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}
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XML_SetBase(mExpatParser, absUrl.get());
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const int bufSize = 1024;
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char buffer[bufSize];
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int result;
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PRBool done;
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do {
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extInput->read(buffer, bufSize);
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done = extInput->eof();
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if (!(result =
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XML_Parse(mExpatParser, buffer, extInput->gcount(), done))) {
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createErrorString();
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mErrorString.Append(PRUnichar('\n'));
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done = MB_TRUE;
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}
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} while (!done);
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delete extInput;
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XML_ParserFree(mExpatParser);
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mExpatParser = parent;
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return result;
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}
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void
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txXMLParser::createErrorString()
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{
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XML_Error errCode = XML_GetErrorCode(mExpatParser);
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mErrorString.AppendWithConversion(XML_ErrorString(errCode));
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mErrorString.AppendLiteral(" at line ");
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mErrorString.AppendInt(XML_GetCurrentLineNumber(mExpatParser));
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mErrorString.AppendLiteral(" in ");
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mErrorString.Append((const PRUnichar*)XML_GetBase(mExpatParser));
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}
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#endif
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