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230 lines
7.7 KiB
C++
230 lines
7.7 KiB
C++
#include <Columns/ColumnString.h>
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#include <Poco/UTF8Encoding.h>
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#if __SSE2__
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#include <emmintrin.h>
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#endif
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namespace DB
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{
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namespace
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{
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/// xor or do nothing
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template <bool>
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UInt8 xor_or_identity(const UInt8 c, const int mask)
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{
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return c ^ mask;
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}
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template <>
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inline UInt8 xor_or_identity<false>(const UInt8 c, const int)
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{
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return c;
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}
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/// It is caller's responsibility to ensure the presence of a valid cyrillic sequence in array
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template <bool to_lower>
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inline void UTF8CyrillicToCase(const UInt8 *& src, UInt8 *& dst)
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{
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if (src[0] == 0xD0u && (src[1] >= 0x80u && src[1] <= 0x8Fu))
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{
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/// ЀЁЂЃЄЅІЇЈЉЊЋЌЍЎЏ
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*dst++ = xor_or_identity<to_lower>(*src++, 0x1);
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*dst++ = xor_or_identity<to_lower>(*src++, 0x10);
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}
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else if (src[0] == 0xD1u && (src[1] >= 0x90u && src[1] <= 0x9Fu))
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{
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/// ѐёђѓєѕіїјљњћќѝўџ
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*dst++ = xor_or_identity<!to_lower>(*src++, 0x1);
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*dst++ = xor_or_identity<!to_lower>(*src++, 0x10);
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}
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else if (src[0] == 0xD0u && (src[1] >= 0x90u && src[1] <= 0x9Fu))
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{
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/// А-П
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*dst++ = *src++;
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*dst++ = xor_or_identity<to_lower>(*src++, 0x20);
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}
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else if (src[0] == 0xD0u && (src[1] >= 0xB0u && src[1] <= 0xBFu))
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{
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/// а-п
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*dst++ = *src++;
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*dst++ = xor_or_identity<!to_lower>(*src++, 0x20);
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}
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else if (src[0] == 0xD0u && (src[1] >= 0xA0u && src[1] <= 0xAFu))
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{
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/// Р-Я
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*dst++ = xor_or_identity<to_lower>(*src++, 0x1);
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*dst++ = xor_or_identity<to_lower>(*src++, 0x20);
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}
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else if (src[0] == 0xD1u && (src[1] >= 0x80u && src[1] <= 0x8Fu))
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{
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/// р-я
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*dst++ = xor_or_identity<!to_lower>(*src++, 0x1);
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*dst++ = xor_or_identity<!to_lower>(*src++, 0x20);
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}
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}
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}
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/** If the string contains UTF-8 encoded text, convert it to the lower (upper) case.
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* Note: It is assumed that after the character is converted to another case,
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* the length of its multibyte sequence in UTF-8 does not change.
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* Otherwise, the behavior is undefined.
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*/
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template <char not_case_lower_bound,
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char not_case_upper_bound,
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int to_case(int),
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void cyrillic_to_case(const UInt8 *&, UInt8 *&)>
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struct LowerUpperUTF8Impl
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{
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static void vector(
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const ColumnString::Chars_t & data,
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const ColumnString::Offsets & offsets,
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ColumnString::Chars_t & res_data,
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ColumnString::Offsets & res_offsets)
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{
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res_data.resize(data.size());
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res_offsets.assign(offsets);
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array(data.data(), data.data() + data.size(), res_data.data());
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}
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static void vector_fixed(const ColumnString::Chars_t & data, size_t /*n*/, ColumnString::Chars_t & res_data)
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{
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res_data.resize(data.size());
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array(data.data(), data.data() + data.size(), res_data.data());
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}
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static void constant(const std::string & data, std::string & res_data)
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{
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res_data.resize(data.size());
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array(reinterpret_cast<const UInt8 *>(data.data()),
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reinterpret_cast<const UInt8 *>(data.data() + data.size()),
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reinterpret_cast<UInt8 *>(res_data.data()));
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}
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/** Converts a single code point starting at `src` to desired case, storing result starting at `dst`.
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* `src` and `dst` are incremented by corresponding sequence lengths. */
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static void toCase(const UInt8 *& src, const UInt8 * src_end, UInt8 *& dst)
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{
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if (src[0] <= ascii_upper_bound)
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{
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if (*src >= not_case_lower_bound && *src <= not_case_upper_bound)
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*dst++ = *src++ ^ flip_case_mask;
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else
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*dst++ = *src++;
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}
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else if (src + 1 < src_end
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&& ((src[0] == 0xD0u && (src[1] >= 0x80u && src[1] <= 0xBFu)) || (src[0] == 0xD1u && (src[1] >= 0x80u && src[1] <= 0x9Fu))))
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{
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cyrillic_to_case(src, dst);
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}
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else if (src + 1 < src_end && src[0] == 0xC2u)
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{
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/// Punctuation U+0080 - U+00BF, UTF-8: C2 80 - C2 BF
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*dst++ = *src++;
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*dst++ = *src++;
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}
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else if (src + 2 < src_end && src[0] == 0xE2u)
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{
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/// Characters U+2000 - U+2FFF, UTF-8: E2 80 80 - E2 BF BF
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = *src++;
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}
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else
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{
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static const Poco::UTF8Encoding utf8;
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if (const auto chars = utf8.convert(to_case(utf8.convert(src)), dst, src_end - src))
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{
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src += chars;
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dst += chars;
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}
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else
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{
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++src;
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++dst;
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}
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}
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}
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private:
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static constexpr auto ascii_upper_bound = '\x7f';
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static constexpr auto flip_case_mask = 'A' ^ 'a';
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static void array(const UInt8 * src, const UInt8 * src_end, UInt8 * dst)
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{
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#if __SSE2__
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const auto bytes_sse = sizeof(__m128i);
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auto src_end_sse = src + (src_end - src) / bytes_sse * bytes_sse;
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/// SSE2 packed comparison operate on signed types, hence compare (c < 0) instead of (c > 0x7f)
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const auto v_zero = _mm_setzero_si128();
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const auto v_not_case_lower_bound = _mm_set1_epi8(not_case_lower_bound - 1);
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const auto v_not_case_upper_bound = _mm_set1_epi8(not_case_upper_bound + 1);
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const auto v_flip_case_mask = _mm_set1_epi8(flip_case_mask);
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while (src < src_end_sse)
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{
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const auto chars = _mm_loadu_si128(reinterpret_cast<const __m128i *>(src));
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/// check for ASCII
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const auto is_not_ascii = _mm_cmplt_epi8(chars, v_zero);
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const auto mask_is_not_ascii = _mm_movemask_epi8(is_not_ascii);
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/// ASCII
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if (mask_is_not_ascii == 0)
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{
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const auto is_not_case
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= _mm_and_si128(_mm_cmpgt_epi8(chars, v_not_case_lower_bound), _mm_cmplt_epi8(chars, v_not_case_upper_bound));
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const auto mask_is_not_case = _mm_movemask_epi8(is_not_case);
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/// everything in correct case ASCII
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if (mask_is_not_case == 0)
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst), chars);
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else
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{
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/// ASCII in mixed case
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/// keep `flip_case_mask` only where necessary, zero out elsewhere
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const auto xor_mask = _mm_and_si128(v_flip_case_mask, is_not_case);
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/// flip case by applying calculated mask
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const auto cased_chars = _mm_xor_si128(chars, xor_mask);
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/// store result back to destination
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst), cased_chars);
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}
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src += bytes_sse;
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dst += bytes_sse;
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}
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else
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{
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/// UTF-8
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const auto expected_end = src + bytes_sse;
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while (src < expected_end)
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toCase(src, src_end, dst);
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/// adjust src_end_sse by pushing it forward or backward
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const auto diff = src - expected_end;
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if (diff != 0)
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{
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if (src_end_sse + diff < src_end)
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src_end_sse += diff;
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else
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src_end_sse -= bytes_sse - diff;
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}
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}
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}
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#endif
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/// handle remaining symbols
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while (src < src_end)
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toCase(src, src_end, dst);
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}
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};
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}
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