RetroZilla/extensions/transformiix/source/xpath/nsXPathExpression.cpp

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2015-10-21 05:03:22 +02:00
/* -*- 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
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Peter Van der Beken <peterv@propagandism.org>
*
* 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 "nsXPathExpression.h"
#include "Expr.h"
#include "ExprResult.h"
#include "nsDOMError.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMClassInfo.h"
#include "nsIDOMDocument.h"
#include "nsIDOMXPathNamespace.h"
#include "nsXPathResult.h"
#include "nsDOMError.h"
#include "txURIUtils.h"
#include "txXPathTreeWalker.h"
NS_IMPL_ADDREF(nsXPathExpression)
NS_IMPL_RELEASE(nsXPathExpression)
NS_INTERFACE_MAP_BEGIN(nsXPathExpression)
NS_INTERFACE_MAP_ENTRY(nsIDOMXPathExpression)
NS_INTERFACE_MAP_ENTRY(nsIDOMNSXPathExpression)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMXPathExpression)
NS_INTERFACE_MAP_ENTRY_EXTERNAL_DOM_CLASSINFO(XPathExpression)
NS_INTERFACE_MAP_END
nsXPathExpression::nsXPathExpression(nsAutoPtr<Expr>& aExpression,
txResultRecycler* aRecycler)
: mExpression(aExpression),
mRecycler(aRecycler)
{
}
nsXPathExpression::~nsXPathExpression()
{
}
NS_IMETHODIMP
nsXPathExpression::Evaluate(nsIDOMNode *aContextNode,
PRUint16 aType,
nsISupports *aInResult,
nsISupports **aResult)
{
return EvaluateWithContext(aContextNode, 1, 1, aType, aInResult, aResult);
}
NS_IMETHODIMP
nsXPathExpression::EvaluateWithContext(nsIDOMNode *aContextNode,
PRUint32 aContextPosition,
PRUint32 aContextSize,
PRUint16 aType,
nsISupports *aInResult,
nsISupports **aResult)
{
NS_ENSURE_ARG(aContextNode);
if (aContextPosition > aContextSize)
return NS_ERROR_FAILURE;
if (!URIUtils::CanCallerAccess(aContextNode))
return NS_ERROR_DOM_SECURITY_ERR;
nsresult rv;
PRUint16 nodeType;
rv = aContextNode->GetNodeType(&nodeType);
NS_ENSURE_SUCCESS(rv, rv);
if (nodeType == nsIDOMNode::TEXT_NODE ||
nodeType == nsIDOMNode::CDATA_SECTION_NODE) {
nsCOMPtr<nsIDOMCharacterData> textNode = do_QueryInterface(aContextNode);
NS_ENSURE_TRUE(textNode, NS_ERROR_FAILURE);
if (textNode) {
PRUint32 textLength;
textNode->GetLength(&textLength);
if (textLength == 0)
return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
}
// XXX Need to get logical XPath text node for CDATASection
// and Text nodes.
}
else if (nodeType != nsIDOMNode::DOCUMENT_NODE &&
nodeType != nsIDOMNode::ELEMENT_NODE &&
nodeType != nsIDOMNode::ATTRIBUTE_NODE &&
nodeType != nsIDOMNode::COMMENT_NODE &&
nodeType != nsIDOMNode::PROCESSING_INSTRUCTION_NODE &&
nodeType != nsIDOMXPathNamespace::XPATH_NAMESPACE_NODE) {
return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
}
NS_ENSURE_ARG(aResult);
*aResult = nsnull;
nsAutoPtr<txXPathNode> contextNode(txXPathNativeNode::createXPathNode(aContextNode));
if (!contextNode) {
return NS_ERROR_OUT_OF_MEMORY;
}
EvalContextImpl eContext(*contextNode, aContextPosition, aContextSize,
mRecycler);
nsRefPtr<txAExprResult> exprResult;
rv = mExpression->evaluate(&eContext, getter_AddRefs(exprResult));
NS_ENSURE_SUCCESS(rv, rv);
PRUint16 resultType = aType;
if (aType == nsIDOMXPathResult::ANY_TYPE) {
short exprResultType = exprResult->getResultType();
switch (exprResultType) {
case txAExprResult::NUMBER:
resultType = nsIDOMXPathResult::NUMBER_TYPE;
break;
case txAExprResult::STRING:
resultType = nsIDOMXPathResult::STRING_TYPE;
break;
case txAExprResult::BOOLEAN:
resultType = nsIDOMXPathResult::BOOLEAN_TYPE;
break;
case txAExprResult::NODESET:
resultType = nsIDOMXPathResult::UNORDERED_NODE_ITERATOR_TYPE;
break;
case txAExprResult::RESULT_TREE_FRAGMENT:
NS_ERROR("Can't return a tree fragment!");
return NS_ERROR_FAILURE;
}
}
// We need a result object and it must be our implementation.
nsCOMPtr<nsIXPathResult> xpathResult = do_QueryInterface(aInResult);
if (!xpathResult) {
// Either no aInResult or not one of ours.
xpathResult = new nsXPathResult();
NS_ENSURE_TRUE(xpathResult, NS_ERROR_OUT_OF_MEMORY);
}
rv = xpathResult->SetExprResult(exprResult, resultType);
NS_ENSURE_SUCCESS(rv, rv);
return CallQueryInterface(xpathResult, aResult);
}
/*
* Implementation of the txIEvalContext private to nsXPathExpression
* EvalContextImpl bases on only one context node and no variables
*/
nsresult
nsXPathExpression::EvalContextImpl::getVariable(PRInt32 aNamespace,
nsIAtom* aLName,
txAExprResult*& aResult)
{
aResult = 0;
return NS_ERROR_INVALID_ARG;
}
MBool nsXPathExpression::EvalContextImpl::isStripSpaceAllowed(const txXPathNode& aNode)
{
return MB_FALSE;
}
void* nsXPathExpression::EvalContextImpl::getPrivateContext()
{
// we don't have a private context here.
return nsnull;
}
txResultRecycler* nsXPathExpression::EvalContextImpl::recycler()
{
return mRecycler;
}
void nsXPathExpression::EvalContextImpl::receiveError(const nsAString& aMsg,
nsresult aRes)
{
mLastError = aRes;
// forward aMsg to console service?
}
const txXPathNode& nsXPathExpression::EvalContextImpl::getContextNode()
{
return mContextNode;
}
PRUint32 nsXPathExpression::EvalContextImpl::size()
{
return mContextSize;
}
PRUint32 nsXPathExpression::EvalContextImpl::position()
{
return mContextPosition;
}