comparator.h

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#pragma once
 
// FIXME: Replace C++ headers when GCCv5+ C++ headers are installed
#include <string.h>
#include <PropWare/utility/utility.h>
 
namespace PropWare {
 
template<typename T>
class Comparator {
    public:
        virtual bool valid (const T *lhs) const = 0;
};
 
class NonNegativeIntegerComparator : public Comparator<int> {
    public:
        NonNegativeIntegerComparator () {
        }
 
        bool valid (const int *lhs) const {
            return 0 <= *lhs;
        }
};
 
class YesNoComparator : public Comparator<char> {
    public:
        YesNoComparator () {
        }
 
        virtual bool valid (const char *userInput) const {
            char buffer[16];
            strcpy(buffer, userInput);
            Utility::to_lower(buffer);
            return 0 == strcmp("n", buffer) ||
                    0 == strcmp("no", buffer) ||
                    0 == strcmp("y", buffer) ||
                    0 == strcmp("yes", buffer);
        }
};
 
}
 
extern const PropWare::NonNegativeIntegerComparator NON_NEGATIVE_COMP;
 
extern const PropWare::YesNoComparator YES_NO_COMP;