VariableManipulator.h

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/*
Copyright (c) 2013, Komodo Does Inc
All rights reserved.
 
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- Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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 VARIABLE_MANIPULATOR_H
#define VARIABLE_MANIPULATOR_H
 
#ifndef STACK_OPERATOR_H
#include "StackOperator.h"
#endif // STACK_OPERATOR_H
 
namespace Calculator {
 
  /** Variable Modifier for Variable Operations
   *
   * Support multiple operations distinguished by the Operation parameter.
   *
   * Operations support separate variable-element manipulations
   */
  class VariableManipulator : public StackOperator {
  public:
    typedef std::shared_ptr<VariableManipulator> Ptr;
 
    /** \enum Operation Operations supported */
    enum class Operation {
      /** Write the value in next-to-top to variable in top*/
      WRITE,
 
    /** Replace the top variable with its value */
    READ
      };
    
    /** Create to perform operation.
     *
     * @param op to perform
     *
     * @return VariableManipulator created
     */
    static VariableManipulator::Ptr create(Operation op);
 
    ~VariableManipulator();
 
  protected:
    /** Create to perform operation.
     *
     * @param op to perform
     */
    VariableManipulator(Operation op);
    
    VariableManipulator(const VariableManipulator&) = delete;
    VariableManipulator(VariableManipulator&&) = delete;
    VariableManipulator& operator=(const VariableManipulator&) = delete;
    VariableManipulator& operator=(VariableManipulator&&) = delete;
 
    virtual Result operator()(Stack& stack, StackOperator::Ptr ofThis);
    
  private:
    const Operation op;
  };
 
  /** Create VariableManipulator from a string */
  class VariableManipulatorCreator : public StackOperatorCreator {
  public:
    virtual ~VariableManipulatorCreator();
 
    virtual std::string getHelp() const;
    virtual StackOperator::Ptr create(const std::string& str);
  };
} // namespace Calculator
 
#endif // VARIABLE_MANIPULATOR_H