44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
#ifndef TAG_PARSER_CASEINSENSITIVECOMPARER
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#define TAG_PARSER_CASEINSENSITIVECOMPARER
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#include "./global.h"
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#include <string>
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#include <iostream>
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namespace TagParser {
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/*!
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* \brief The CaseInsensitiveCharComparer struct defines a method for case-insensivive character comparison (less).
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*/
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struct TAG_PARSER_EXPORT CaseInsensitiveCharComparer {
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static constexpr unsigned char toLower(const unsigned char c)
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{
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return (c >= 'A' && c <= 'Z') ? (c + ('a' - 'A')) : c;
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}
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bool operator()(const unsigned char lhs, const unsigned char rhs) const
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{
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return toLower(lhs) < toLower(rhs);
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}
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};
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/*!
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* \brief The CaseInsensitiveStringComparer struct defines a method for case-insensivive string comparison (less).
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*/
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struct TAG_PARSER_EXPORT CaseInsensitiveStringComparer {
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bool operator()(const std::string &lhs, const std::string &rhs) const
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{
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return std::lexicographical_compare(lhs.cbegin(), lhs.cend(), rhs.cbegin(), rhs.cend(), CaseInsensitiveCharComparer());
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}
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bool operator()(std::string_view lhs, std::string_view rhs) const
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{
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return std::lexicographical_compare(lhs.cbegin(), lhs.cend(), rhs.cbegin(), rhs.cend(), CaseInsensitiveCharComparer());
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}
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};
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} // namespace TagParser
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#endif // TAG_PARSER_CASEINSENSITIVECOMPARER
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