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/*
* expression.h - Copyright 2005 Frerich Raabe <raabe@kde.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef EXPRESSION_H
#define EXPRESSION_H
#include "util.h"
#include <QHash>
#include <QList>
#include <dom/dom_string.h>
#include <xml/dom_stringimpl.h>
#include <xml/dom_nodelistimpl.h>
#include <misc/shared.h>
namespace DOM
{
class NodeImpl;
}
namespace khtml
{
class XPathNSResolverImpl;
namespace XPath
{
struct EvaluationContext {
EvaluationContext()
{
reset(nullptr, nullptr);
}
void reset(DOM::NodeImpl *ctx, XPathNSResolverImpl *res)
{
node = ctx;
resolver = res;
size = 1;
position = 1;
exceptionCode = 0;
}
DOM::NodeImpl *node;
unsigned long size;
unsigned long position;
QHash<DOM::DOMString, DOM::DOMString> variableBindings;
// reports only first one.
void reportException(int ec)
{
if (!exceptionCode) {
exceptionCode = ec;
}
}
int exceptionCode;
/* The function library is globally accessible through
* FunctionLibrary::self()
*/
XPathNSResolverImpl *resolver;
};
class Value
{
public:
enum Type {
Nodeset, Boolean, Number, String
};
Value();
explicit Value(DOM::NodeImpl *value);
explicit Value(const DomNodeList &value);
explicit Value(bool value);
explicit Value(double value);
explicit Value(const DOM::DOMString &value);
Type type() const;
bool isNodeset() const;
bool isBoolean() const;
bool isNumber() const;
bool isString() const;
DomNodeList &toNodeset(); // may return 0
const DomNodeList &toNodeset() const;
bool toBoolean() const;
double toNumber() const;
DOM::DOMString toString() const;
QString dump() const;
private:
// Catch undesired conversions -- this manages to go to bool otherwise!
explicit Value(const char *);
Type m_type;
DomNodeList m_nodeset;
bool m_bool;
double m_number;
DOM::DOMString m_string;
};
class Expression
{
public:
static EvaluationContext &evaluationContext();
Expression();
virtual ~Expression();
virtual Value evaluate() const;
void addSubExpression(Expression *expr);
void optimize();
virtual bool isConstant() const;
virtual QString dump() const = 0;
static void reportInvalidExpressionErr();
static void reportNamespaceErr();
protected:
unsigned int subExprCount() const;
Expression *subExpr(unsigned int i);
const Expression *subExpr(unsigned int i) const;
private:
virtual Value doEvaluate() const = 0;
QList<Expression *> m_subExpressions;
Value *m_constantValue;
};
} // namespace XPath
} // namespace khtml
#endif // EXPRESSION_H
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