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/*
* Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006, 2009 Apple Inc.
*
* 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 XPathExpressionNode_h
#define XPathExpressionNode_h
#include "base/macros.h"
#include "core/CoreExport.h"
#include "core/dom/Node.h"
#include "core/xml/XPathValue.h"
#include "platform/wtf/HashMap.h"
#include "platform/wtf/Vector.h"
#include "platform/wtf/text/StringHash.h"
namespace blink {
namespace XPath {
struct CORE_EXPORT EvaluationContext {
STACK_ALLOCATED();
public:
explicit EvaluationContext(Node&);
Member<Node> node;
unsigned long size;
unsigned long position;
HashMap<String, String> variable_bindings;
bool had_type_conversion_error;
};
class CORE_EXPORT ParseNode : public GarbageCollectedFinalized<ParseNode> {
public:
virtual ~ParseNode() = default;
virtual void Trace(blink::Visitor* visitor) {}
};
class CORE_EXPORT Expression : public ParseNode {
public:
Expression();
~Expression() override;
virtual void Trace(blink::Visitor*);
virtual Value Evaluate(EvaluationContext&) const = 0;
void AddSubExpression(Expression* expr) {
is_context_node_sensitive_ |= expr->is_context_node_sensitive_;
is_context_position_sensitive_ |= expr->is_context_position_sensitive_;
is_context_size_sensitive_ |= expr->is_context_size_sensitive_;
sub_expressions_.push_back(expr);
}
bool IsContextNodeSensitive() const { return is_context_node_sensitive_; }
bool IsContextPositionSensitive() const {
return is_context_position_sensitive_;
}
bool IsContextSizeSensitive() const { return is_context_size_sensitive_; }
void SetIsContextNodeSensitive(bool value) {
is_context_node_sensitive_ = value;
}
void SetIsContextPositionSensitive(bool value) {
is_context_position_sensitive_ = value;
}
void SetIsContextSizeSensitive(bool value) {
is_context_size_sensitive_ = value;
}
virtual Value::Type ResultType() const = 0;
protected:
unsigned SubExprCount() const { return sub_expressions_.size(); }
Expression* SubExpr(unsigned i) { return sub_expressions_[i].Get(); }
const Expression* SubExpr(unsigned i) const {
return sub_expressions_[i].Get();
}
private:
HeapVector<Member<Expression>> sub_expressions_;
// Evaluation details that can be used for optimization.
bool is_context_node_sensitive_;
bool is_context_position_sensitive_;
bool is_context_size_sensitive_;
DISALLOW_COPY_AND_ASSIGN(Expression);
};
} // namespace XPath
} // namespace blink
#endif // XPathExpressionNode_h