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62 lines
2.7 KiB
C++
62 lines
2.7 KiB
C++
#ifndef COMPONENTS_MISC_STRINGS_LOWER_H
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#define COMPONENTS_MISC_STRINGS_LOWER_H
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#include <string>
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#include <string_view>
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namespace Misc::StringUtils
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{
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/* Mapping table to go from uppercase to lowercase for plain ASCII.*/
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static constexpr unsigned char tolowermap[256] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46,
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47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 97, 98, 99, 100, 101, 102, 103, 104,
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105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 91, 92, 93, 94, 95,
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96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118,
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119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140,
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141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162,
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163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184,
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185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206,
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207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228,
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229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250,
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251, 252, 253, 254, 255 };
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/// Plain and simple locale-unaware toLower. Anything from A to Z is lower-cased, multibyte characters are
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/// unchanged. Don't use std::tolower(char, locale&) because that is abysmally slow. Don't use tolower(int) because
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/// that depends on global locale.
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inline constexpr char toLower(char c)
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{
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return tolowermap[static_cast<unsigned char>(c)];
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}
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inline constexpr char8_t toLower(char8_t c)
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{
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return tolowermap[static_cast<unsigned char>(c)];
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}
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/// Transforms input string to lower case w/o copy
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inline void lowerCaseInPlace(std::string& str)
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{
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for (auto& ch : str)
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ch = toLower(ch);
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}
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inline void lowerCaseInPlace(std::u8string& str)
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{
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for (auto& ch : str)
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ch = toLower(ch);
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}
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/// Returns lower case copy of input string
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inline std::string lowerCase(std::string_view in)
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{
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std::string out(in);
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lowerCaseInPlace(out);
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return out;
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}
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inline std::u8string lowerCase(std::u8string_view in)
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{
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std::u8string out(in);
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lowerCaseInPlace(out);
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return out;
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}
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}
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#endif
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