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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef __TX_I_XPATH_CONTEXT
#define __TX_I_XPATH_CONTEXT
#include "txCore.h"
class FunctionCall;
class nsIAtom;
class txAExprResult;
class txResultRecycler;
class txXPathNode;
/*
* txIParseContext
*
* This interface describes the context needed to create
* XPath Expressions and XSLT Patters.
* (not completely though. key() requires the ProcessorState, which is
* not part of this interface.)
*/
class txIParseContext
{
public:
virtual ~txIParseContext()
{
}
/*
* Return a namespaceID for a given prefix.
*/
virtual nsresult resolveNamespacePrefix(nsIAtom* aPrefix, int32_t& aID) = 0;
/*
* Create a FunctionCall, needed for extension function calls and
* XSLT. XPath function calls are resolved by the Parser.
*/
virtual nsresult resolveFunctionCall(nsIAtom* aName, int32_t aID,
FunctionCall** aFunction) = 0;
/**
* Should nametests parsed in this context be case-sensitive
*/
virtual bool caseInsensitiveNameTests() = 0;
/*
* Callback to be used by the Parser if errors are detected.
*/
virtual void SetErrorOffset(uint32_t aOffset) = 0;
enum Allowed {
KEY_FUNCTION = 1 << 0
};
virtual bool allowed(Allowed aAllowed)
{
return true;
}
};
/*
* txIMatchContext
*
* Interface used for matching XSLT Patters.
* This is the part of txIEvalContext (see below), that is independent
* of the context node when evaluating a XPath expression, too.
* When evaluating a XPath expression, |txIMatchContext|s are used
* to transport the information from Step to Step.
*/
class txIMatchContext
{
public:
virtual ~txIMatchContext()
{
}
/*
* Return the ExprResult associated with the variable with the
* given namespace and local name.
*/
virtual nsresult getVariable(int32_t aNamespace, nsIAtom* aLName,
txAExprResult*& aResult) = 0;
/*
* Is whitespace stripping allowed for the given node?
* See http://www.w3.org/TR/xslt#strip
*/
virtual bool isStripSpaceAllowed(const txXPathNode& aNode) = 0;
/**
* Returns a pointer to the private context
*/
virtual void* getPrivateContext() = 0;
virtual txResultRecycler* recycler() = 0;
/*
* Callback to be used by the expression/pattern if errors are detected.
*/
virtual void receiveError(const nsAString& aMsg, nsresult aRes) = 0;
};
#define TX_DECL_MATCH_CONTEXT \
nsresult getVariable(int32_t aNamespace, nsIAtom* aLName, \
txAExprResult*& aResult); \
bool isStripSpaceAllowed(const txXPathNode& aNode); \
void* getPrivateContext(); \
txResultRecycler* recycler(); \
void receiveError(const nsAString& aMsg, nsresult aRes)
class txIEvalContext : public txIMatchContext
{
public:
/*
* Get the context node.
*/
virtual const txXPathNode& getContextNode() = 0;
/*
* Get the size of the context node set.
*/
virtual uint32_t size() = 0;
/*
* Get the position of the context node in the context node set,
* starting with 1.
*/
virtual uint32_t position() = 0;
};
#define TX_DECL_EVAL_CONTEXT \
TX_DECL_MATCH_CONTEXT; \
const txXPathNode& getContextNode(); \
uint32_t size(); \
uint32_t position()
#endif // __TX_I_XPATH_CONTEXT
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