lazyconditionwalker.hpp

/* Copyright (c) 2014, The Nuria Project
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *    1. The origin of this software must not be misrepresented; you must not
 *       claim that you wrote the original software. If you use this software
 *       in a product, an acknowledgment in the product documentation would be
 *       appreciated but is not required.
 *    2. Altered source versions must be plainly marked as such, and must not be
 *       misrepresented as being the original software.
 *    3. This notice may not be removed or altered from any source
 *       distribution.
 */

#ifndef NURIA_LAZYCONDITIONWALKER_HPP
#define NURIA_LAZYCONDITIONWALKER_HPP

#include <QSharedData>

#include "lazyevaluation.hpp"
#include "essentials.hpp"
#include "callback.hpp"

namespace Nuria {

class LazyConditionWalkerPrivate;

class NURIA_CORE_EXPORT LazyConditionWalker {
public:
    
    LazyConditionWalker ();
    
    LazyConditionWalker (const LazyConditionWalker &other);
    
    ~LazyConditionWalker ();
    
    LazyConditionWalker &operator= (const LazyConditionWalker &other);
    
    void onCondition (LazyCondition::Type type, const Callback &method);
    
    void onField (int fieldType, const Callback &method);
    
    void onVariant (int userType, const Callback &method);
    
    LazyCondition walk (const LazyCondition &condition, bool walkArguments = false);
    
private:
    bool walkVariant (QVariant &variant, QVariantList &stack, bool walkArguments);
    bool walkCondition (QVariant &conditionVariant, QVariantList &stack, bool walkArguments);
    bool walkField (QVariant &fieldVariant, QVariantList &stack, bool walkArguments);
    bool walkTestCall (QVariant &callVariant, QVariantList &stack, bool walkArguments);
    
    QSharedDataPointer< LazyConditionWalkerPrivate > d;
    
};

}

#endif // NURIA_LAZYCONDITIONWALKER_HPP