caseinsensitivecomparer.h

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#ifndef TAG_PARSER_CASEINSENSITIVECOMPARER
#define TAG_PARSER_CASEINSENSITIVECOMPARER
 
#include "./global.h"
 
#include <string>
 
#include <iostream>
 
namespace TagParser {

struct TAG_PARSER_EXPORT CaseInsensitiveCharComparer {
    static constexpr unsigned char toLower(const unsigned char c)
    {
        return (c >= 'A' && c <= 'Z') ? (c + ('a' - 'A')) : c;
    }
 
    bool operator()(const unsigned char lhs, const unsigned char rhs) const
    {
        return toLower(lhs) < toLower(rhs);
    }
};

struct TAG_PARSER_EXPORT CaseInsensitiveStringComparer {
    bool operator()(const std::string &lhs, const std::string &rhs) const
    {
        return std::lexicographical_compare(lhs.cbegin(), lhs.cend(), rhs.cbegin(), rhs.cend(), CaseInsensitiveCharComparer());
    }
    bool operator()(std::string_view lhs, std::string_view rhs) const
    {
        return std::lexicographical_compare(lhs.cbegin(), lhs.cend(), rhs.cbegin(), rhs.cend(), CaseInsensitiveCharComparer());
    }
};
 
} // namespace TagParser
 
#endif // TAG_PARSER_CASEINSENSITIVECOMPARER