Source/WebCore/xml/XPathPredicate.h

/*
 * Copyright 2005 Frerich Raabe <raabe@kde.org>
 * Copyright (C) 2006-2024 Apple Inc. All rights reserved.
 *
 * 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.
 */

#pragma once

#include "XPathExpressionNode.h"
#include <wtf/TZoneMalloc.h>

namespace WebCore {
namespace XPath {

class Number final : public Expression {
    WTF_MAKE_TZONE_ALLOCATED(Number);
public:
    explicit Number(double);

private:
    Value evaluate() const override;
    Value::Type resultType() const override { return Value::Type::Number; }

    Value m_value;
};

class StringExpression final : public Expression {
    WTF_MAKE_TZONE_ALLOCATED(StringExpression);
public:
    explicit StringExpression(String&&);

private:
    Value evaluate() const override;
    Value::Type resultType() const override { return Value::Type::String; }

    Value m_value;
};

class Negative final : public Expression {
    WTF_MAKE_TZONE_ALLOCATED(Negative);
public:
    explicit Negative(std::unique_ptr<Expression>);

private:
    Value evaluate() const override;
    Value::Type resultType() const override { return Value::Type::Number; }
};

class NumericOp final : public Expression {
    WTF_MAKE_TZONE_ALLOCATED(NumericOp);
public:
    enum class Opcode : uint8_t { Add, Sub, Mul, Div, Mod };
    NumericOp(Opcode, std::unique_ptr<Expression> lhs, std::unique_ptr<Expression> rhs);

private:
    Value evaluate() const override;
    Value::Type resultType() const override { return Value::Type::Number; }

    Opcode m_opcode;
};

class EqTestOp final : public Expression {
    WTF_MAKE_TZONE_ALLOCATED(EqTestOp);
public:
    enum class Opcode : uint8_t { Eq, Ne, Gt, Lt, Ge, Le };
    EqTestOp(Opcode, std::unique_ptr<Expression> lhs, std::unique_ptr<Expression> rhs);
    Value evaluate() const override;

private:
    Value::Type resultType() const override { return Value::Type::Boolean; }
    bool compare(const Value&, const Value&) const;

    Opcode m_opcode;
};

class LogicalOp final : public Expression {
    WTF_MAKE_TZONE_ALLOCATED(LogicalOp);
public:
    enum class Opcode : bool { And, Or };
    LogicalOp(Opcode, std::unique_ptr<Expression> lhs, std::unique_ptr<Expression> rhs);

private:
    Value::Type resultType() const override { return Value::Type::Boolean; }
    bool shortCircuitOn() const;
    Value evaluate() const override;

    Opcode m_opcode;
};

class Union final : public Expression {
    WTF_MAKE_TZONE_ALLOCATED(Union);
public:
    Union(std::unique_ptr<Expression>, std::unique_ptr<Expression>);

private:
    Value evaluate() const override;
    Value::Type resultType() const override { return Value::Type::NodeSet; }
};

bool evaluatePredicate(const Expression&);
bool predicateIsContextPositionSensitive(const Expression&);

} // namespace XPath
} // namespace WebCore