mirror of https://github.com/orefkov/simstr.git
1472 lines
57 KiB
C++
1472 lines
57 KiB
C++
/*
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* (c) Проект "SimStr", Александр Орефков orefkov@gmail.com
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* ver. 1.0
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* Реализация строковых функций
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*/
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#include "simstr/simple_unicode.h"
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#include "simstr/sstring.h"
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#include <simdutf.h>
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namespace simstr {
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template class sstring<u8s>;
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template class sstring<uws>;
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template class sstring<u16s>;
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template class sstring<u32s>;
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// from sqlite.c
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/*
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** Notes On Invalid UTF-8:
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**
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** * This routine never allows a 7-bit character (0x00 through 0x7f) to
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** be encoded as a multi-byte character. Any multi-byte character that
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** attempts to encode a value between 0x00 and 0x7f is rendered as 0xfffd.
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**
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** * This routine never allows a UTF16 surrogate value to be encoded.
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** If a multi-byte character attempts to encode a value between
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** 0xd800 and 0xe000 then it is rendered as 0xfffd.
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**
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** * Bytes in the range of 0x80 through 0xbf which occur as the first
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** byte of a character are interpreted as single-byte characters
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** and rendered as themselves even though they are technically
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** invalid characters.
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**
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** * This routine accepts over-length UTF8 encodings
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** for unicode values 0x80 and greater. It does not change over-length
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** encodings to 0xfffd as some systems recommend.
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*/
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static const uu8s sqlite3Utf8Trans1[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
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0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
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0x0c, 0x0d, 0x0e, 0x0f, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
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};
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u32s readUtf8Symbol(const uu8s*& ptr, const uu8s* end) {
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u32s us = static_cast<u32s>(*ptr++);
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if (us >= 0xC0) {
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us = sqlite3Utf8Trans1[us - 0xC0];
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while (ptr < end && (*ptr & 0xC0) == 0x80)
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us = (us << 6) + (0x3F & *(ptr++));
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if (us < 0x80 || (us & 0xFFFFF800) == 0xD800 || (us & 0xFFFFFFFE) == 0xFFFE) {
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us = 0xFFFD;
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}
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}
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return us;
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}
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void writeUtf8Symbol(uu8s*& write, u32s us) {
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using u8 = uu8s;
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if (us <= 0x80)
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*write++ = (u8)us;
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else if (us < 0x00800) {
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*write++ = 0xC0 + (u8)((us >> 6) & 0x1F);
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*write++ = 0x80 + (u8)(us & 0x3F);
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} else if (us < 0x10000) {
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*write++ = 0xE0 + (u8)((us >> 12) & 0x0F);
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*write++ = 0x80 + (u8)((us >> 6) & 0x3F);
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*write++ = 0x80 + (u8)(us & 0x3F);
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} else {
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*write++ = 0xF0 + (u8)((us >> 18) & 0x07);
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*write++ = 0x80 + (u8)((us >> 12) & 0x3F);
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*write++ = 0x80 + (u8)((us >> 6) & 0x3F);
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*write++ = 0x80 + (u8)(us & 0x3F);
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}
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}
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u32s readUtf16Symbol(const u16s*& ptr, const u16s* end) {
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u32s us = static_cast<u32s>(*ptr++);
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if (us >= 0xD800) {
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if (us < 0xDC00 && ptr < end) {
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if (u32s s = static_cast<u32s>(*ptr++); s >= 0xDC00 && s < 0xE000) {
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return ((us & 0x3ff) << 10) + (s & 0x3ff) + 0x10000;
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}
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}
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return 0xFFFD;
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}
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return us;
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}
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void writeUtf16Symbol(u16s*& ptr, u32s s) {
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if (s < 0x10000) {
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*ptr++ = static_cast<u16s>(s);
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} else {
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s -= 0x10000;
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*ptr++ = 0xD800 + ((s >> 10) & 0x3FF);
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*ptr++ = 0xDC00 + (s & 0x3FF);
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}
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}
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size_t utf8len(u32s us) {
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if (us <= 0x80)
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return 1;
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else if (us < 0x00800)
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return 2;
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else if (us < 0x10000)
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return 3;
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else
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return 4;
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}
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SIMSTR_API size_t utf_convert_selector<u8s, u16s>::need_len(const u8s*src, size_t srcLen) {
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return simdutf::utf16_length_from_utf8(src, srcLen);
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}
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SIMSTR_API size_t utf_convert_selector<u8s, u16s>::convert(const u8s* src, size_t srcLen, u16s* dest) {
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return simdutf::convert_utf8_to_utf16(src, srcLen, dest);
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}
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SIMSTR_API size_t utf_convert_selector<u8s, u32s>::need_len(const u8s*src, size_t srcLen) {
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return simdutf::utf32_length_from_utf8(src, srcLen);
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}
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SIMSTR_API size_t utf_convert_selector<u8s, u32s>::convert(const u8s* src, size_t srcLen, u32s* dest) {
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return simdutf::convert_utf8_to_utf32(src, srcLen, dest);
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}
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SIMSTR_API size_t utf_convert_selector<u16s, u8s>::need_len(const u16s*src, size_t srcLen) {
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return simdutf::utf8_length_from_utf16(src, srcLen);
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}
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SIMSTR_API size_t utf_convert_selector<u16s, u8s>::convert(const u16s* src, size_t srcLen, u8s* dest) {
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return simdutf::convert_utf16_to_utf8(src, srcLen, dest);
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}
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SIMSTR_API size_t utf_convert_selector<u16s, u32s>::need_len(const u16s*src, size_t srcLen) {
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return simdutf::utf32_length_from_utf16(src, srcLen);
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}
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SIMSTR_API size_t utf_convert_selector<u16s, u32s>::convert(const u16s* src, size_t srcLen, u32s* dest) {
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return simdutf::convert_utf16_to_utf32(src, srcLen, dest);
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}
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SIMSTR_API size_t utf_convert_selector<u32s, u8s>::need_len(const u32s*src, size_t srcLen) {
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return simdutf::utf8_length_from_utf32(src, srcLen);
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}
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SIMSTR_API size_t utf_convert_selector<u32s, u8s>::convert(const u32s* src, size_t srcLen, u8s* dest) {
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return simdutf::convert_utf32_to_utf8(src, srcLen, dest);
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}
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SIMSTR_API size_t utf_convert_selector<u32s, u16s>::need_len(const u32s*src, size_t srcLen) {
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return simdutf::utf16_length_from_utf32(src, srcLen);
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}
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SIMSTR_API size_t utf_convert_selector<u32s, u16s>::convert(const u32s* src, size_t srcLen, u16s* dest) {
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return simdutf::convert_utf32_to_utf16(src, srcLen, dest);
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}
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inline u32s makeLowerU(u32s s) {
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if (isAsciiUpper(s))
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return s | 0x20;
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else if (s > 127 && s < 0x10000)
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return simpleUnicodeLower(static_cast<uint16_t>(s));
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else
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return s;
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}
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inline u32s makeUpperU(u32s s) {
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if (isAsciiLower(s))
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return s & ~0x20;
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else if (s > 127 && s < 0x10000)
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return simpleUnicodeUpper(static_cast<uint16_t>(s));
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else
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return s;
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}
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inline u32s makeFoldU(u32s s) {
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if (isAsciiUpper(s))
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return s | 0x20;
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else if (s > 127 && s < 0x10000)
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return simpleUnicodeFold(static_cast<uint16_t>(s));
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else
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return s;
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}
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/*
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* Поиск utf-8 symbols, которые меняют свою длину при upper/lower преобразовании
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* вот они нашлись
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* "İiıIſSȺⱥȾⱦɐⱯɑⱭɫⱢɱⱮɽⱤẞßιΙΩωKkÅåⱢɫⱤɽⱥȺⱦȾⱭɑⱮɱⱯɐ"
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l2u ıIſSɐⱯɑⱭɫⱢɱⱮɽⱤιΙⱥȺⱦȾ
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u2l İiȺⱥȾⱦẞßΩωKkÅåⱢɫⱤɽⱭɑⱮɱⱯɐ
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void findStrange() {
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u16s badsL2U[100], * pBadslu = badsL2U;
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u16s badsU2L[100], * pBadsul = badsU2L;
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uu8s buf[20];
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size_t allToUpper = 0, allToLower = 0, lowerbadshorter = 0, upperbadshorter = 0, lowerbadlonger = 0, upperbadlonger = 0;
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for (u32s s = 128; s <= 0xFFFF; s++) {
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u16s upper = makeUpperU(s);
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if (upper != s) {
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allToUpper++;
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uu8s* pTest = buf;
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writeUtf8Symbol(pTest, s);
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size_t len1 = pTest - buf;
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pTest = buf;
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writeUtf8Symbol(pTest, upper);
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size_t len2 = pTest - buf;
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if (len1 != len2) {
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*pBadslu++ = s;
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*pBadslu++ = upper;
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if (len1 > len2) {
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upperbadshorter++;
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} else if (len1 < len2) {
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upperbadlonger++;
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}
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}
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}
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u16s lower = makeLowerU(s);
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if (lower != s) {
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allToLower++;
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uu8s* pTest = buf;
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writeUtf8Symbol(pTest, s);
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size_t len1 = pTest - buf;
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pTest = buf;
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writeUtf8Symbol(pTest, lower);
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size_t len2 = pTest - buf;
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if (len1 != len2) {
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*pBadsul++ = s;
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*pBadsul++ = lower;
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if (len1 > len2) {
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lowerbadshorter++;
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} else if (len1 < len2) {
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lowerbadlonger++;
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}
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}
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}
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}
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*pBadsul = 0;
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*pBadslu = 0;
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return;
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}
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*/
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template<auto Op>
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size_t utf8_case_change(const u8s*& src, size_t len, u8s*& dest, size_t lenBuffer) {
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// Допущение для оптимизации - считается, что выделенный буфер записи всегда не меньше длины буфера чтения
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// и что буфер записи не начинается внутри буфера чтения
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// то есть если символ считан, и длина записываемого символа не больше считанного, то он поместится в буфер записи
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// и не перетрет символы, которые еще не прочитали
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// По другому работать откажемся
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if (lenBuffer < len || (dest > src && dest < src + len))
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return len;
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const uu8s *beginReadPos = reinterpret_cast<const uu8s*>(src), *readPos = beginReadPos, *endReadPos = beginReadPos + len,
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*readFromPos = readPos;
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uu8s *beginWritePos = reinterpret_cast<uu8s*>(dest), *writePos = beginWritePos, *endWritePos = writePos + lenBuffer, *tempWrite;
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size_t state = 0, writedSymbolLen, needExtraLen = 0;
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u32s readedSymbol, writedSymbol;
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lstringa<4096> tempStore;
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while (readPos < endReadPos) {
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readedSymbol = readUtf8Symbol(readPos, endReadPos), writedSymbol = Op(readedSymbol);
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writedSymbolLen = utf8len(writedSymbol);
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switch (state) {
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case 0: // начальное состояние
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// Так как выделенный буфер записи всегда не меньше длины буфера чтения
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// то если символ считан, и длина записываемого символа не больше считанного,
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// то он поместится в буфер записи, можно не проверять
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// оптимизация для inplace конвертации в идеальном случае
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if (writePos == readFromPos && readedSymbol == writedSymbol) {
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writePos = const_cast<uu8s*>(readPos);
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readFromPos = readPos;
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continue;
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}
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if (writePos + writedSymbolLen <= endWritePos && (writePos > readPos || writePos + writedSymbolLen <= readPos)) {
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// всё отлично
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writeUtf8Symbol(writePos, writedSymbol);
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} else {
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state = 1;
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goto state1;
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}
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break;
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case 1:
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state1:
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// До этого когда-то был считан символ, при записи ставший длиннее.
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// Можно его писать, но надо проверять, что записываемый символ:
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// - не перезатрёт читаемые
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// - не выйдет за границы буфера записи
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// - восстановит обычный режим, если записываемый символ короче прочитанного
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if (writePos + writedSymbolLen > endWritePos) {
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// Записываемый символ не поместится в буфер записи
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// Запомним, где это произошло, подсчитаем символы далее
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src = reinterpret_cast<const u8s*>(readFromPos);
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dest = reinterpret_cast<u8s*>(writePos);
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needExtraLen = 0;
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state = 2;
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goto state2;
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} else if (writePos < readPos && writePos + writedSymbolLen > readPos) {
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// Совсем плохой случай - записываемый символ перезатрет следующий читаемый
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// Запомним, где это произошло, подсчитаем символы далее
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src = reinterpret_cast<const u8s*>(readFromPos);
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dest = reinterpret_cast<u8s*>(writePos);
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needExtraLen = 0;
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if (lenBuffer > len) {
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// считаем, что это второй вызов, и места в буфере в итоге хватит
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// поэтому будем сохранять считанные символы в свой буфер, а потом скопируем их в результат
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tempWrite = reinterpret_cast<uu8s*>(tempStore.reserve(lenBuffer - static_cast<size_t>(writePos - beginWritePos)));
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state = 3;
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goto state3;
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} else {
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// Это первый вызов, будем просто считать нужное место
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state = 2;
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goto state2;
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}
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} else {
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// Можем записать прочитанный символ
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writeUtf8Symbol(writePos, writedSymbol);
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// Возможно, мы выровнялись по прочитанным/записанным байтам, тогда можно снова писать в буфер
|
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// в обычном состоянии
|
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size_t allReaded = static_cast<size_t>(readPos - beginReadPos);
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size_t allWrite = static_cast<size_t>(writePos - beginWritePos);
|
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if (allReaded >= allWrite) {
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// вернулись в обычное состояние
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state = 0;
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}
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}
|
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break;
|
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case 2:
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state2:
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// Место в буфере кончилось, просто считаем нужное место
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needExtraLen += writedSymbolLen;
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break;
|
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case 3:
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state3:
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// Был прочитан удлинившийся символ, который мог перезатереть читаемые.
|
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// Конец буфера записи не достигнут, но писать туда нельзя.
|
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// При этом известно, что место в буфере выделено
|
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// с нужным запасом, и сейчас мы просто запоминаем считанные символы, чтобы
|
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// потом вписать их когда позволит указатель чтения
|
||
if (writePos + writedSymbolLen <= readPos || readPos == endReadPos) {
|
||
// Опа, символ стал короче и снова влезает в буфер. Или все прочитали, можно записывать
|
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std::char_traits<u8s>::copy(dest, tempStore.symbols(), needExtraLen);
|
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writeUtf8Symbol(writePos, writedSymbol);
|
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state = 0;
|
||
} else {
|
||
if (writePos + writedSymbolLen > endWritePos) {
|
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// Таки всё-равно не влезем в буфер
|
||
state = 2;
|
||
goto state2;
|
||
}
|
||
writeUtf8Symbol(tempWrite, writedSymbol);
|
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writePos += writedSymbolLen;
|
||
needExtraLen += writedSymbolLen;
|
||
}
|
||
break;
|
||
}
|
||
readFromPos = readPos;
|
||
}
|
||
if (state == 0 || state == 1) {
|
||
// все отлично, можно возвращать получившуюся длину
|
||
src = reinterpret_cast<const u8s*>(readFromPos);
|
||
dest = reinterpret_cast<u8s*>(writePos);
|
||
return static_cast<size_t>(writePos - beginWritePos);
|
||
} else {
|
||
size_t writedCount = static_cast<size_t>(dest - (u8s*)beginWritePos);
|
||
size_t needBuffer = writedCount + needExtraLen;
|
||
if (needBuffer <= lenBuffer) {
|
||
// значит попали во 2ое состояние и считали символы, так как перезатирали читаемые
|
||
// но видимо потом попались укоротившиеся и по итогу всё-равно все влезет, только
|
||
// нужно временно сохранять символы. Запустим еще раз
|
||
size_t readedCount = static_cast<size_t>((uu8s*)src - beginReadPos);
|
||
len -= readedCount;
|
||
lenBuffer -= writedCount; // по идее они должны быть одинаковые
|
||
utf8_case_change<Op>(src, len, dest, lenBuffer + 1);
|
||
}
|
||
// в dest и src уже сохранены последние позиции. Вернем нужную длину
|
||
return needBuffer;
|
||
}
|
||
}
|
||
|
||
SIMSTR_API size_t unicode_traits<u8s>::upper(const u8s*& src, size_t len, u8s*& dest, size_t lenBuffer) {
|
||
return utf8_case_change<makeUpperU>(src, len, dest, lenBuffer);
|
||
}
|
||
|
||
SIMSTR_API size_t unicode_traits<u8s>::lower(const u8s*& src, size_t len, u8s*& dest, size_t lenBuffer) {
|
||
return utf8_case_change<makeLowerU>(src, len, dest, lenBuffer);
|
||
}
|
||
|
||
template<auto Op>
|
||
void utf16_change_case(const u16s* src, size_t len, u16s* dest) {
|
||
if (dest != src) {
|
||
// не inplace - надо писать все символы
|
||
for (size_t l = 0; l < len; l++)
|
||
dest[l] = static_cast<u16s>(Op(src[l]));
|
||
} else {
|
||
// inplace - будем писать только измененные символы
|
||
for (size_t l = 0; l < len; l++) {
|
||
u16s s = src[l], s1 = static_cast<u16s>(Op(s));
|
||
if (s != s1)
|
||
dest[l] = s1;
|
||
}
|
||
}
|
||
}
|
||
|
||
void unicode_traits<u16s>::upper(const u16s* src, size_t len, u16s* dest) {
|
||
utf16_change_case<makeUpperU>(src, len, dest);
|
||
}
|
||
|
||
void unicode_traits<u16s>::lower(const u16s* src, size_t len, u16s* dest) {
|
||
utf16_change_case<makeLowerU>(src, len, dest);
|
||
}
|
||
|
||
template<auto Op>
|
||
void utf32_change_case(const u32s* src, size_t len, u32s* dest) {
|
||
if (dest != src) {
|
||
// не inplace - надо писать все символы
|
||
for (size_t l = 0; l < len; l++)
|
||
*dest++ = Op(*src++);
|
||
} else {
|
||
// inplace - будем писать только измененные символы
|
||
for (size_t l = 0; l < len; l++, src++, dest++) {
|
||
u32s s = *src, s1 = Op(s);
|
||
if (s != s1)
|
||
*dest = s1;
|
||
}
|
||
}
|
||
}
|
||
|
||
SIMSTR_API void unicode_traits<u32s>::upper(const u32s* src, size_t len, u32s* dest) {
|
||
utf32_change_case<makeUpperU>(src, len, dest);
|
||
}
|
||
|
||
SIMSTR_API void unicode_traits<u32s>::lower(const u32s* src, size_t len, u32s* dest) {
|
||
utf32_change_case<makeLowerU>(src, len, dest);
|
||
}
|
||
|
||
SIMSTR_API int unicode_traits<u8s>::compareiu(const u8s* text1, size_t len1, const u8s* text2, size_t len2) {
|
||
if (!len1) {
|
||
return len2 == 0 ? 0 : -1;
|
||
} else if (!len2)
|
||
return 1;
|
||
const uu8s *ptr1 = reinterpret_cast<const uu8s*>(text1), *ptr2 = reinterpret_cast<const uu8s*>(text2),
|
||
*ptr1End = ptr1 + len1, *ptr2End = ptr2 + len2;
|
||
|
||
for (;;) {
|
||
u32s s1 = makeFoldU(readUtf8Symbol(ptr1, ptr1End)), s2 = makeFoldU(readUtf8Symbol(ptr2, ptr2End));
|
||
if (s1 > s2)
|
||
return 1;
|
||
else if (s1 < s2)
|
||
return -1;
|
||
else if (ptr1 >= ptr1End)
|
||
return ptr2 >= ptr2End ? 0 : -1;
|
||
else if (ptr2 >= ptr2End)
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
SIMSTR_API int unicode_traits<u16s>::compareiu(const u16s* text1, size_t len1, const u16s* text2, size_t len2) {
|
||
if (!len1) {
|
||
return len2 == 0 ? 0 : -1;
|
||
} else if (!len2)
|
||
return 1;
|
||
const u16s *ptr1End = text1 + len1, *ptr2End = text2 + len2;
|
||
|
||
for (;;) {
|
||
u32s s1 = makeFoldU(readUtf16Symbol(text1, ptr1End)), s2 = makeFoldU(readUtf16Symbol(text2, ptr2End));
|
||
if (s1 > s2)
|
||
return 1;
|
||
else if (s1 < s2)
|
||
return -1;
|
||
else if (text1 >= ptr1End)
|
||
return text2 >= ptr2End ? 0 : -1;
|
||
else if (text2 >= ptr2End)
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
SIMSTR_API int unicode_traits<u32s>::compareiu(const u32s* text1, size_t len1, const u32s* text2, size_t len2) {
|
||
if (!len1) {
|
||
return len2 == 0 ? 0 : -1;
|
||
} else if (!len2)
|
||
return 1;
|
||
const u32s *ptr1End = text1 + len1, *ptr2End = text2 + len2;
|
||
|
||
for (;;) {
|
||
u32s s1 = makeFoldU(*text1++), s2 = makeFoldU(*text2++);
|
||
if (s1 > s2)
|
||
return 1;
|
||
else if (s1 < s2)
|
||
return -1;
|
||
else if (text1 > ptr1End)
|
||
return text2 >= ptr2End ? 0 : -1;
|
||
else if (text2 > ptr2End)
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
SIMSTR_API size_t unicode_traits<u8s>::hashia(const u8s* src, size_t l) {
|
||
size_t h = fnv::basis;
|
||
for (size_t i = 0; i < l; i++) {
|
||
h = (h ^ (uu8s)makeAsciiLower(src[i])) * fnv::prime;
|
||
}
|
||
return h;
|
||
}
|
||
|
||
SIMSTR_API size_t unicode_traits<u8s>::hashiu(const u8s* src, size_t l) {
|
||
size_t h = fnv::basis;
|
||
const uu8s *ptr = (const uu8s*)src, *pEnd = ptr + l;
|
||
|
||
while (ptr < pEnd) {
|
||
h = (h ^ makeFoldU(readUtf8Symbol(ptr, pEnd))) * fnv::prime;
|
||
}
|
||
return h;
|
||
}
|
||
|
||
SIMSTR_API size_t unicode_traits<u16s>::hashia(const u16s* src, size_t l) {
|
||
size_t h = fnv::basis;
|
||
for (size_t i = 0; i < l; i++) {
|
||
h = (h ^ makeAsciiLower(src[i])) * fnv::prime;
|
||
}
|
||
return h;
|
||
}
|
||
|
||
SIMSTR_API size_t unicode_traits<u16s>::hashiu(const u16s* src, size_t l) {
|
||
size_t h = fnv::basis;
|
||
const u16s* pEnd = src + l;
|
||
|
||
while (src < pEnd) {
|
||
h = (h ^ makeFoldU(readUtf16Symbol(src, pEnd))) * fnv::prime;
|
||
}
|
||
return h;
|
||
}
|
||
|
||
SIMSTR_API size_t unicode_traits<u32s>::hashia(const u32s* src, size_t l) {
|
||
size_t h = fnv::basis;
|
||
for (size_t i = 0; i < l; i++) {
|
||
h = (h ^ makeAsciiLower(src[i])) * fnv::prime;
|
||
}
|
||
return h;
|
||
}
|
||
|
||
SIMSTR_API size_t unicode_traits<u32s>::hashiu(const u32s* src, size_t l) {
|
||
size_t h = fnv::basis;
|
||
for (size_t i = 0; i < l; i++) {
|
||
h = (h ^ makeFoldU(src[i])) * fnv::prime;
|
||
}
|
||
return h;
|
||
}
|
||
|
||
namespace {
|
||
// Based on simdjson sources https://github.com/simdjson/simdjson/blob/667d0ed3c77f55cbda2082b034168d69898d1f88/include/simdjson/compile_time_json-inl.h#L189
|
||
|
||
// Counts the number of leading zeros in a 64-bit integer.
|
||
int leading_zeroes(uint64_t input_num) {
|
||
|
||
#if defined __has_builtin
|
||
# if __has_builtin (__builtin_clzll)
|
||
# define HAS_BLT_CLZ
|
||
# endif
|
||
#endif
|
||
#ifdef HAS_BLT_CLZ
|
||
return __builtin_clzll(input_num);
|
||
#else
|
||
int last_bit = 0;
|
||
|
||
if (input_num & uint64_t(0xffffffff00000000)) {
|
||
input_num >>= 32;
|
||
last_bit |= 32;
|
||
}
|
||
if (input_num & uint64_t(0xffff0000)) {
|
||
input_num >>= 16;
|
||
last_bit |= 16;
|
||
}
|
||
if (input_num & uint64_t(0xff00)) {
|
||
input_num >>= 8;
|
||
last_bit |= 8;
|
||
}
|
||
if (input_num & uint64_t(0xf0)) {
|
||
input_num >>= 4;
|
||
last_bit |= 4;
|
||
}
|
||
if (input_num & uint64_t(0xc)) {
|
||
input_num >>= 2;
|
||
last_bit |= 2;
|
||
}
|
||
if (input_num & uint64_t(0x2)) { /* input_num >>= 1; */
|
||
last_bit |= 1;
|
||
}
|
||
return 63 - last_bit;
|
||
#endif
|
||
}
|
||
|
||
// Multiplies two 32-bit unsigned integers and returns a 64-bit result.
|
||
uint64_t emulu(uint32_t x, uint32_t y) {
|
||
return x * (uint64_t)y;
|
||
}
|
||
|
||
uint64_t umul128_generic(uint64_t ab, uint64_t cd, uint64_t* hi) {
|
||
uint64_t ad = emulu((uint32_t)(ab >> 32), (uint32_t)cd);
|
||
uint64_t bd = emulu((uint32_t)ab, (uint32_t)cd);
|
||
uint64_t adbc = ad + emulu((uint32_t)ab, (uint32_t)(cd >> 32));
|
||
uint64_t adbc_carry = (uint64_t)(adbc < ad);
|
||
uint64_t lo = bd + (adbc << 32);
|
||
*hi = emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) + (adbc_carry << 32) + (uint64_t)(lo < bd);
|
||
return lo;
|
||
}
|
||
|
||
// Represents a 128-bit unsigned integer as two 64-bit parts.
|
||
// We have a value128 struct elsewhere in the simdjson, but we
|
||
// use a separate one here for clarity.
|
||
struct value128 {
|
||
uint64_t low;
|
||
uint64_t high;
|
||
|
||
constexpr value128(uint64_t _low, uint64_t _high) : low(_low), high(_high) {}
|
||
constexpr value128() : low(0), high(0) {}
|
||
};
|
||
|
||
// Multiplies two 64-bit integers and returns a 128-bit result as value128.
|
||
value128 full_multiplication(uint64_t a, uint64_t b) {
|
||
value128 answer;
|
||
answer.low = umul128_generic(a, b, &answer.high);
|
||
return answer;
|
||
}
|
||
|
||
// Converts mantissa and exponent to a double, considering the sign.
|
||
double to_double(uint64_t mantissa, int64_t exponent, bool negative) {
|
||
uint64_t sign_bit = negative ? (1ULL << 63) : 0;
|
||
uint64_t exponent_bits = (uint64_t(exponent) & 0x7FF) << 52;
|
||
uint64_t bits = sign_bit | exponent_bits | (mantissa & ((1ULL << 52) - 1));
|
||
return std::bit_cast<double>(bits);
|
||
}
|
||
|
||
constexpr int smallest_power = -342;
|
||
constexpr int largest_power = 308;
|
||
|
||
// Precomputed powers of ten from 10^0 to 10^22. These
|
||
// can be represented exactly using the double type.
|
||
const double power_of_ten[] = {
|
||
1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11,
|
||
1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22
|
||
};
|
||
|
||
/**
|
||
* When mapping numbers from decimal to binary,
|
||
* we go from w * 10^q to m * 2^p but we have
|
||
* 10^q = 5^q * 2^q, so effectively
|
||
* we are trying to match
|
||
* w * 2^q * 5^q to m * 2^p. Thus the powers of two
|
||
* are not a concern since they can be represented
|
||
* exactly using the binary notation, only the powers of five
|
||
* affect the binary significand.
|
||
*/
|
||
// The truncated powers of five from 5^-342 all the way to 5^308
|
||
// The mantissa is truncated to 128 bits, and
|
||
// never rounded up. Uses about 10KB.
|
||
const uint64_t power_of_five_128[]= {
|
||
0xeef453d6923bd65a,0x113faa2906a13b3f,
|
||
0x9558b4661b6565f8,0x4ac7ca59a424c507,
|
||
0xbaaee17fa23ebf76,0x5d79bcf00d2df649,
|
||
0xe95a99df8ace6f53,0xf4d82c2c107973dc,
|
||
0x91d8a02bb6c10594,0x79071b9b8a4be869,
|
||
0xb64ec836a47146f9,0x9748e2826cdee284,
|
||
0xe3e27a444d8d98b7,0xfd1b1b2308169b25,
|
||
0x8e6d8c6ab0787f72,0xfe30f0f5e50e20f7,
|
||
0xb208ef855c969f4f,0xbdbd2d335e51a935,
|
||
0xde8b2b66b3bc4723,0xad2c788035e61382,
|
||
0x8b16fb203055ac76,0x4c3bcb5021afcc31,
|
||
0xaddcb9e83c6b1793,0xdf4abe242a1bbf3d,
|
||
0xd953e8624b85dd78,0xd71d6dad34a2af0d,
|
||
0x87d4713d6f33aa6b,0x8672648c40e5ad68,
|
||
0xa9c98d8ccb009506,0x680efdaf511f18c2,
|
||
0xd43bf0effdc0ba48,0x212bd1b2566def2,
|
||
0x84a57695fe98746d,0x14bb630f7604b57,
|
||
0xa5ced43b7e3e9188,0x419ea3bd35385e2d,
|
||
0xcf42894a5dce35ea,0x52064cac828675b9,
|
||
0x818995ce7aa0e1b2,0x7343efebd1940993,
|
||
0xa1ebfb4219491a1f,0x1014ebe6c5f90bf8,
|
||
0xca66fa129f9b60a6,0xd41a26e077774ef6,
|
||
0xfd00b897478238d0,0x8920b098955522b4,
|
||
0x9e20735e8cb16382,0x55b46e5f5d5535b0,
|
||
0xc5a890362fddbc62,0xeb2189f734aa831d,
|
||
0xf712b443bbd52b7b,0xa5e9ec7501d523e4,
|
||
0x9a6bb0aa55653b2d,0x47b233c92125366e,
|
||
0xc1069cd4eabe89f8,0x999ec0bb696e840a,
|
||
0xf148440a256e2c76,0xc00670ea43ca250d,
|
||
0x96cd2a865764dbca,0x380406926a5e5728,
|
||
0xbc807527ed3e12bc,0xc605083704f5ecf2,
|
||
0xeba09271e88d976b,0xf7864a44c633682e,
|
||
0x93445b8731587ea3,0x7ab3ee6afbe0211d,
|
||
0xb8157268fdae9e4c,0x5960ea05bad82964,
|
||
0xe61acf033d1a45df,0x6fb92487298e33bd,
|
||
0x8fd0c16206306bab,0xa5d3b6d479f8e056,
|
||
0xb3c4f1ba87bc8696,0x8f48a4899877186c,
|
||
0xe0b62e2929aba83c,0x331acdabfe94de87,
|
||
0x8c71dcd9ba0b4925,0x9ff0c08b7f1d0b14,
|
||
0xaf8e5410288e1b6f,0x7ecf0ae5ee44dd9,
|
||
0xdb71e91432b1a24a,0xc9e82cd9f69d6150,
|
||
0x892731ac9faf056e,0xbe311c083a225cd2,
|
||
0xab70fe17c79ac6ca,0x6dbd630a48aaf406,
|
||
0xd64d3d9db981787d,0x92cbbccdad5b108,
|
||
0x85f0468293f0eb4e,0x25bbf56008c58ea5,
|
||
0xa76c582338ed2621,0xaf2af2b80af6f24e,
|
||
0xd1476e2c07286faa,0x1af5af660db4aee1,
|
||
0x82cca4db847945ca,0x50d98d9fc890ed4d,
|
||
0xa37fce126597973c,0xe50ff107bab528a0,
|
||
0xcc5fc196fefd7d0c,0x1e53ed49a96272c8,
|
||
0xff77b1fcbebcdc4f,0x25e8e89c13bb0f7a,
|
||
0x9faacf3df73609b1,0x77b191618c54e9ac,
|
||
0xc795830d75038c1d,0xd59df5b9ef6a2417,
|
||
0xf97ae3d0d2446f25,0x4b0573286b44ad1d,
|
||
0x9becce62836ac577,0x4ee367f9430aec32,
|
||
0xc2e801fb244576d5,0x229c41f793cda73f,
|
||
0xf3a20279ed56d48a,0x6b43527578c1110f,
|
||
0x9845418c345644d6,0x830a13896b78aaa9,
|
||
0xbe5691ef416bd60c,0x23cc986bc656d553,
|
||
0xedec366b11c6cb8f,0x2cbfbe86b7ec8aa8,
|
||
0x94b3a202eb1c3f39,0x7bf7d71432f3d6a9,
|
||
0xb9e08a83a5e34f07,0xdaf5ccd93fb0cc53,
|
||
0xe858ad248f5c22c9,0xd1b3400f8f9cff68,
|
||
0x91376c36d99995be,0x23100809b9c21fa1,
|
||
0xb58547448ffffb2d,0xabd40a0c2832a78a,
|
||
0xe2e69915b3fff9f9,0x16c90c8f323f516c,
|
||
0x8dd01fad907ffc3b,0xae3da7d97f6792e3,
|
||
0xb1442798f49ffb4a,0x99cd11cfdf41779c,
|
||
0xdd95317f31c7fa1d,0x40405643d711d583,
|
||
0x8a7d3eef7f1cfc52,0x482835ea666b2572,
|
||
0xad1c8eab5ee43b66,0xda3243650005eecf,
|
||
0xd863b256369d4a40,0x90bed43e40076a82,
|
||
0x873e4f75e2224e68,0x5a7744a6e804a291,
|
||
0xa90de3535aaae202,0x711515d0a205cb36,
|
||
0xd3515c2831559a83,0xd5a5b44ca873e03,
|
||
0x8412d9991ed58091,0xe858790afe9486c2,
|
||
0xa5178fff668ae0b6,0x626e974dbe39a872,
|
||
0xce5d73ff402d98e3,0xfb0a3d212dc8128f,
|
||
0x80fa687f881c7f8e,0x7ce66634bc9d0b99,
|
||
0xa139029f6a239f72,0x1c1fffc1ebc44e80,
|
||
0xc987434744ac874e,0xa327ffb266b56220,
|
||
0xfbe9141915d7a922,0x4bf1ff9f0062baa8,
|
||
0x9d71ac8fada6c9b5,0x6f773fc3603db4a9,
|
||
0xc4ce17b399107c22,0xcb550fb4384d21d3,
|
||
0xf6019da07f549b2b,0x7e2a53a146606a48,
|
||
0x99c102844f94e0fb,0x2eda7444cbfc426d,
|
||
0xc0314325637a1939,0xfa911155fefb5308,
|
||
0xf03d93eebc589f88,0x793555ab7eba27ca,
|
||
0x96267c7535b763b5,0x4bc1558b2f3458de,
|
||
0xbbb01b9283253ca2,0x9eb1aaedfb016f16,
|
||
0xea9c227723ee8bcb,0x465e15a979c1cadc,
|
||
0x92a1958a7675175f,0xbfacd89ec191ec9,
|
||
0xb749faed14125d36,0xcef980ec671f667b,
|
||
0xe51c79a85916f484,0x82b7e12780e7401a,
|
||
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|
||
0xfe0efb53d30dd4d7,0xed238cd383aa0110,
|
||
0x9ec95d1463e8a506,0xf4363804324a40aa,
|
||
0xc67bb4597ce2ce48,0xb143c6053edcd0d5,
|
||
0xf81aa16fdc1b81da,0xdd94b7868e94050a,
|
||
0x9b10a4e5e9913128,0xca7cf2b4191c8326,
|
||
0xc1d4ce1f63f57d72,0xfd1c2f611f63a3f0,
|
||
0xf24a01a73cf2dccf,0xbc633b39673c8cec,
|
||
0x976e41088617ca01,0xd5be0503e085d813,
|
||
0xbd49d14aa79dbc82,0x4b2d8644d8a74e18,
|
||
0xec9c459d51852ba2,0xddf8e7d60ed1219e,
|
||
0x93e1ab8252f33b45,0xcabb90e5c942b503,
|
||
0xb8da1662e7b00a17,0x3d6a751f3b936243,
|
||
0xe7109bfba19c0c9d,0xcc512670a783ad4,
|
||
0x906a617d450187e2,0x27fb2b80668b24c5,
|
||
0xb484f9dc9641e9da,0xb1f9f660802dedf6,
|
||
0xe1a63853bbd26451,0x5e7873f8a0396973,
|
||
0x8d07e33455637eb2,0xdb0b487b6423e1e8,
|
||
0xb049dc016abc5e5f,0x91ce1a9a3d2cda62,
|
||
0xdc5c5301c56b75f7,0x7641a140cc7810fb,
|
||
0x89b9b3e11b6329ba,0xa9e904c87fcb0a9d,
|
||
0xac2820d9623bf429,0x546345fa9fbdcd44,
|
||
0xd732290fbacaf133,0xa97c177947ad4095,
|
||
0x867f59a9d4bed6c0,0x49ed8eabcccc485d,
|
||
0xa81f301449ee8c70,0x5c68f256bfff5a74,
|
||
0xd226fc195c6a2f8c,0x73832eec6fff3111,
|
||
0x83585d8fd9c25db7,0xc831fd53c5ff7eab,
|
||
0xa42e74f3d032f525,0xba3e7ca8b77f5e55,
|
||
0xcd3a1230c43fb26f,0x28ce1bd2e55f35eb,
|
||
0x80444b5e7aa7cf85,0x7980d163cf5b81b3,
|
||
0xa0555e361951c366,0xd7e105bcc332621f,
|
||
0xc86ab5c39fa63440,0x8dd9472bf3fefaa7,
|
||
0xfa856334878fc150,0xb14f98f6f0feb951,
|
||
0x9c935e00d4b9d8d2,0x6ed1bf9a569f33d3,
|
||
0xc3b8358109e84f07,0xa862f80ec4700c8,
|
||
0xf4a642e14c6262c8,0xcd27bb612758c0fa,
|
||
0x98e7e9cccfbd7dbd,0x8038d51cb897789c,
|
||
0xbf21e44003acdd2c,0xe0470a63e6bd56c3,
|
||
0xeeea5d5004981478,0x1858ccfce06cac74,
|
||
0x95527a5202df0ccb,0xf37801e0c43ebc8,
|
||
0xbaa718e68396cffd,0xd30560258f54e6ba,
|
||
0xe950df20247c83fd,0x47c6b82ef32a2069,
|
||
0x91d28b7416cdd27e,0x4cdc331d57fa5441,
|
||
0xb6472e511c81471d,0xe0133fe4adf8e952,
|
||
0xe3d8f9e563a198e5,0x58180fddd97723a6,
|
||
0x8e679c2f5e44ff8f,0x570f09eaa7ea7648,
|
||
};
|
||
|
||
// Attempts to compute i * 10^(power) exactly; and if "negative" is
|
||
// true, negate the result.
|
||
// Returns true on success, false on failure.
|
||
// Failure suggests and invalid input or out-of-range result.
|
||
bool compute_float_64(int64_t power, uint64_t i, bool negative, double& d) {
|
||
if (i == 0) {
|
||
d = negative ? -0.0 : 0.0;
|
||
return true;
|
||
}
|
||
int64_t exponent = (((152170 + 65536) * power) >> 16) + 1024 + 63;
|
||
int lz = leading_zeroes(i);
|
||
i <<= lz;
|
||
const uint32_t index = 2 * uint32_t(power - smallest_power);
|
||
value128 firstproduct = full_multiplication(i, power_of_five_128[index]);
|
||
if ((firstproduct.high & 0x1FF) == 0x1FF) {
|
||
value128 secondproduct = full_multiplication(i, power_of_five_128[index + 1]);
|
||
firstproduct.low += secondproduct.high;
|
||
if (secondproduct.high > firstproduct.low) {
|
||
firstproduct.high++;
|
||
}
|
||
}
|
||
uint64_t lower = firstproduct.low;
|
||
uint64_t upper = firstproduct.high;
|
||
uint64_t upperbit = upper >> 63;
|
||
uint64_t mantissa = upper >> (upperbit + 9);
|
||
lz += int(1 ^ upperbit);
|
||
int64_t real_exponent = exponent - lz;
|
||
if (real_exponent <= 0) {
|
||
if (-real_exponent + 1 >= 64) {
|
||
d = negative ? -0.0 : 0.0;
|
||
return true;
|
||
}
|
||
mantissa >>= -real_exponent + 1;
|
||
mantissa += (mantissa & 1);
|
||
mantissa >>= 1;
|
||
real_exponent = (mantissa < (uint64_t(1) << 52)) ? 0 : 1;
|
||
d = to_double(mantissa, real_exponent, negative);
|
||
return true;
|
||
}
|
||
if ((lower <= 1) && (power >= -4) && (power <= 23) && ((mantissa & 3) == 1)) {
|
||
if ((mantissa << (upperbit + 64 - 53 - 2)) == upper) {
|
||
mantissa &= ~1;
|
||
}
|
||
}
|
||
mantissa += mantissa & 1;
|
||
mantissa >>= 1;
|
||
if (mantissa >= (1ULL << 53)) {
|
||
mantissa = (1ULL << 52);
|
||
real_exponent++;
|
||
}
|
||
mantissa &= ~(1ULL << 52);
|
||
if (real_exponent > 2046) {
|
||
return false;
|
||
}
|
||
d = to_double(mantissa, real_exponent, negative);
|
||
return true;
|
||
}
|
||
|
||
// Parses a single digit character and updates the integer value.
|
||
template<typename K>
|
||
bool parse_digit(const K c, uint64_t& i) {
|
||
auto digit = int_convert::toDigit<K, 10>(c);
|
||
if (digit > 9) {
|
||
return false;
|
||
}
|
||
i = 10 * i + digit;
|
||
return true;
|
||
}
|
||
|
||
} // namespace
|
||
|
||
template<typename K>
|
||
SIMSTR_API std::optional<double> impl_to_double(const K* start, const K* end) {
|
||
auto get_value = [&](const K* pointer) -> K {
|
||
if (pointer == end) {
|
||
return '\0';
|
||
}
|
||
return *pointer;
|
||
};
|
||
const K* srcinit = start;
|
||
bool negative = (get_value(start) == '-');
|
||
start += (uint8_t)negative;
|
||
if (end - start == 3) {
|
||
if (!negative && (start[0] | 0x20) == K('n')) {
|
||
if ((start[1] | 0x20) == K('a') && (start[2] | 0x20) == K('n')) {
|
||
return std::nan("0");
|
||
}
|
||
} else if ((start[0] | 0x20) == K('i') && (start[1] | 0x20) == K('n') && (start[2] | 0x20) == K('f')) {
|
||
return negative ? -std::numeric_limits<double>::infinity() : std::numeric_limits<double>::infinity();
|
||
}
|
||
}
|
||
uint64_t digits = 0;
|
||
const K* p = start;
|
||
p += parse_digit(get_value(p), digits);
|
||
bool leading_zero = (digits == 0);
|
||
while (parse_digit(get_value(p), digits)) {
|
||
p++;
|
||
}
|
||
if (p == start) {
|
||
return {};
|
||
}
|
||
if ((leading_zero && p != start + 1)) {
|
||
return {};
|
||
}
|
||
int64_t exponent = 0;
|
||
int max_digits = 19;
|
||
bool overflow;
|
||
if (get_value(p) == '.') {
|
||
p++;
|
||
const K* start_decimal_digits = p;
|
||
if (!parse_digit(get_value(p), digits)) {
|
||
return {};
|
||
} // no decimal digits
|
||
p++;
|
||
while (parse_digit(get_value(p), digits)) {
|
||
p++;
|
||
}
|
||
exponent = -(p - start_decimal_digits);
|
||
overflow = p - start - 1 > max_digits;
|
||
if (overflow && leading_zero) {
|
||
const K* start_digits = start + 2;
|
||
while (get_value(start_digits) == '0') {
|
||
start_digits++;
|
||
}
|
||
overflow = p - start_digits > max_digits;
|
||
}
|
||
} else {
|
||
overflow = p - start > max_digits;
|
||
}
|
||
if (overflow) {
|
||
return {};
|
||
}
|
||
if ((get_value(p) | 0x20) == K('e')) {
|
||
p++;
|
||
bool exp_neg = get_value(p) == '-';
|
||
p += exp_neg || get_value(p) == '+';
|
||
uint64_t exp = 0;
|
||
const K* start_exp_digits = p;
|
||
while (parse_digit(get_value(p), exp)) {
|
||
p++;
|
||
}
|
||
if (p - start_exp_digits == 0 || p - start_exp_digits > max_digits) {
|
||
return {};
|
||
}
|
||
exponent += exp_neg ? 0 - exp : exp;
|
||
}
|
||
|
||
if (exponent < smallest_power || exponent > largest_power || p != end) {
|
||
return {};
|
||
}
|
||
double d;
|
||
if (!compute_float_64(exponent, digits, negative, d)) {
|
||
return {};
|
||
}
|
||
return d;
|
||
}
|
||
|
||
template SIMSTR_API std::optional<double> impl_to_double<u8s>(const u8s* start, const u8s* end);
|
||
template SIMSTR_API std::optional<double> impl_to_double<u16s>(const u16s* start, const u16s* end);
|
||
template SIMSTR_API std::optional<double> impl_to_double<u32s>(const u32s* start, const u32s* end);
|
||
template SIMSTR_API std::optional<double> impl_to_double<uws>(const uws* start, const uws* end);
|
||
|
||
} // namespace simstr
|