State_Exercise.cpp

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#include <iostream>
 
#include "helpers/formatstring.h"
#include "helpers/split.h"
#include "helpers/stringlist.h"
 
#include "State_Exercise.h"
#include "State_Class.h"
 
 
namespace // Anonymous
{
    using namespace DesignPatternExamples_cpp;
    
    void _State_DisplayText(const std::string& textToDisplay)
    {
        StringList lines = Helpers::split(textToDisplay, "\n");
        int lineNumber = 1;
        for (std::string line : lines)
        {
            std::cout << Helpers::formatstring("    %2d) %s", lineNumber, line.c_str()) << std::endl;
            ++lineNumber;
        }
    }
 
} // end namespace Anonmyous
 
 
namespace DesignPatternExamples_cpp
{
 
    // ! [Using State in C++]
    void State_Exercise()
    {
        std::cout << std::endl;
        std::cout << "State Exercise" << std::endl;
 
        StateContext_Class filterContext;
        std::string textToFilter =
            "/*####################  Block Comment  #################################*/\n"
            "//####################  Line Comment  ####################################\n"
            "// A comment.  /* A nested comment */\n"
            "\n"
            "void State_Exercise() // An exercise in state machines\n"
            "{\n"
            "    char character = '\\\"';\n"
            "    std::cout << std::endl;\n"
            "    std::cout << \"\\\"State\\\" /*Exercise*/\" << std::endl;\n"
            "\n"
            "    StateContext_Class filterContext;\n"
            "\n"
            "    std::cout << \"\\t\\tDone. //(No, really)//\" << std::endl;\n"
            "}";
 
        std::cout << "  Text to filter:" << std::endl;
        _State_DisplayText(textToFilter);
 
        std::cout << "  Filtering text..." << std::endl;
        std::string filteredText = filterContext.RemoveComments(textToFilter);
 
        std::cout << "  Filtered text:" << std::endl;
        _State_DisplayText(filteredText);
 
        std::cout << "  Done." << std::endl;
    }
    // ! [Using State in C++]
 
} // end namespace