180 lines
9.5 KiB
C++
180 lines
9.5 KiB
C++
#ifndef ARBUTILS_STRINGVIEW_HPP
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#define ARBUTILS_STRINGVIEW_HPP
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#include <cstring>
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#include <memory>
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#include "../Ensure.hpp"
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#include "BasicStringView.hpp"
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#if WINDOWS
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#define STDSTRINGCONSTEXPR
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#else
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#define STDSTRINGCONSTEXPR constexpr
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#endif
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namespace ArbUt {
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class __ConstStringCharHolder {
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char* non_null _value = 0;
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__ConstStringCharHolder(const __ConstStringCharHolder& o) = delete;
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__ConstStringCharHolder& operator=(const __ConstStringCharHolder& other) = delete;
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public:
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__ConstStringCharHolder(const char* non_null value, size_t length) : _value(new char[length + 1]) {
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EnsureNotNull(value);
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// For GCC we need to disable a diagnostic that does not like this.
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#if defined(__GNUC__) && !defined(__clang__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wstringop-truncation"
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#endif
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strncpy(_value, value, length);
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#if defined(__GNUC__) && !defined(__clang__)
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#pragma GCC diagnostic pop
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#endif
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_value[length] = 0;
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}
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~__ConstStringCharHolder() noexcept { delete[] _value; }
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inline constexpr const char* non_null GetValue() const noexcept { return _value; }
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};
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}
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constexpr u32 crc_table[256] = {
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0, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832,
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0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
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0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A,
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0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
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0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3,
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0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
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0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB,
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0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
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0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4,
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0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
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0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074,
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0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
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0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525,
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0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
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0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615,
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0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
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0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76,
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0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
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0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6,
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0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
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0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7,
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0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
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0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7,
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0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
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0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278,
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0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
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0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330,
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0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
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0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D};
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inline static constexpr char charToLower(const char c) { return (c >= 'A' && c <= 'Z') ? c + ('a' - 'A') : c; }
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static u32 constexpr Hash(const char* non_null str, size_t size) {
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u32 crc = 0xffffffff;
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for (size_t i = 0; i < size; ++i) {
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crc = (crc >> 8) ^ crc_table[(crc ^ charToLower(str[i])) & 0xff];
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}
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return crc ^ 0xffffffff;
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};
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static int constexpr CalcLength(const char* non_null str) { return *str ? 1 + CalcLength(str + 1) : 0; }
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namespace ArbUt {
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/// \ingroup Strings
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/// @brief A constant, non-editable string that allows copies to share the same string object.
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class StringView final : public BasicStringView {
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private:
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static std::shared_ptr<__ConstStringCharHolder> __emptyString;
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static inline const std::shared_ptr<__ConstStringCharHolder>& GetEmptyString() { return __emptyString; }
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std::shared_ptr<__ConstStringCharHolder> _str = GetEmptyString();
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public:
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/// @brief Instantiate a StringView using a C string.
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/// @param str A null-terminated C string.
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StringView(const char* non_null str)
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: BasicStringView(CalcLength(str), Hash(str, CalcLength(str))), _str(new __ConstStringCharHolder(str, CalcLength(str))) {}
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/// @brief Instantiate a StringView using a C string, as well as it's length.
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/// @param str A null-terminated C string.
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/// @param length The length of the C string
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StringView(const char* non_null str, size_t length)
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: BasicStringView(length, Hash(str, length)), _str(new __ConstStringCharHolder(str, length)) {}
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StringView() noexcept : BasicStringView(0, Hash("", 0)) {}
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/* Copy operators */
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/// @brief Copy operator
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/// @param other Other StringView
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StringView(const StringView& other) noexcept : BasicStringView(other._length, other._hash), _str(other._str) {}
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/// @brief Special constructor of stringview, specifically designed for use of conversion from StringViewLiteral
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/// to StringView.
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/// @param other Other StringView
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/// @param c A null-terminated C string.
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/// @param length The length of the C string.
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StringView(const BasicStringView& other, const char* non_null c, size_t length) noexcept
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: BasicStringView(length, other.GetHash()), _str(new __ConstStringCharHolder(c, length)) {}
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/// @brief Assignment operator.
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/// @param other Stringview to assign.
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/// @return current stringview.
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StringView& operator=(const StringView& other) noexcept {
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if (this == &other || _str == other._str) {
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return *this;
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}
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_str = other._str;
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_length = other._length;
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_hash = other._hash;
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return *this;
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}
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/// @brief Returns null-terminated C string.
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/// @return Null-terminated C string.
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[[nodiscard]] inline const char* non_null c_str() const noexcept final { return _str->GetValue(); }
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/// @brief Returns std string_view of internal C string.
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/// @return std::string_view.
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[[nodiscard]] inline std::string_view std_str() const noexcept final { return _str->GetValue(); }
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/// @brief Check equality with standard C++ string.
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inline constexpr bool operator==(const std::string_view& rhs) const noexcept final {
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return _hash == Hash(rhs.data(), rhs.size());
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}
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/// @brief Check inequality with standard C++ string.
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inline constexpr bool operator!=(const std::string_view& rhs) const noexcept final {
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return _hash != Hash(rhs.data(), rhs.size());
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}
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/// @brief Check equality with standard C style string.
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inline constexpr bool operator==(const char* non_null rhs) const noexcept final { return _hash == Hash(rhs, CalcLength(rhs)); }
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/// @brief Check inequality with standard C style string.
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inline constexpr bool operator!=(const char* non_null rhs) const noexcept final { return _hash != Hash(rhs, CalcLength(rhs)); }
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/// @brief Calculates the hash for a given C string.
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/// @param val A null-terminated C string.
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/// @return A hash of the given string.
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[[maybe_unused]] [[nodiscard]] inline static constexpr u32 CalculateHash(const char* non_null val) noexcept {
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return Hash(val, CalcLength(val));
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}
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/// @brief Calculates the hash for a given std string.
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/// @param val A std string.
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/// @return A hash of the given string.
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[[maybe_unused]] [[nodiscard]] inline static constexpr u32 CalculateHash(const std::string_view& val) noexcept {
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return Hash(val.data(), val.size());
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}
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/// @brief Returns an empty string.
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/// @return An empty string.
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static const StringView& EmptyString();
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};
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}
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namespace std {
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/// @brief Helper class for hashing string views.
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template <> struct hash<ArbUt::StringView> {
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/// @brief Returns the hash of a stringview.
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/// @param s a StringView.
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/// @return The hash of the StringView.
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constexpr std::size_t operator()(ArbUt::StringView const& s) const noexcept { return s.GetHash(); }
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};
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}
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#endif // ARBUTILS_STRINGVIEW_HPP
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