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-rw-r--r--src/utf8/unchecked.h228
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diff --git a/src/utf8/unchecked.h b/src/utf8/unchecked.h
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-// Copyright 2006 Nemanja Trifunovic
-
-/*
-Permission is hereby granted, free of charge, to any person or organization
-obtaining a copy of the software and accompanying documentation covered by
-this license (the "Software") to use, reproduce, display, distribute,
-execute, and transmit the Software, and to prepare derivative works of the
-Software, and to permit third-parties to whom the Software is furnished to
-do so, all subject to the following:
-
-The copyright notices in the Software and this entire statement, including
-the above license grant, this restriction and the following disclaimer,
-must be included in all copies of the Software, in whole or in part, and
-all derivative works of the Software, unless such copies or derivative
-works are solely in the form of machine-executable object code generated by
-a source language processor.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
-SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
-FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.
-*/
-
-
-#ifndef UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
-#define UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
-
-#include "core.h"
-
-namespace utf8
-{
- namespace unchecked
- {
- template <typename octet_iterator>
- octet_iterator append(uint32_t cp, octet_iterator result)
- {
- if (cp < 0x80) // one octet
- *(result++) = static_cast<uint8_t>(cp);
- else if (cp < 0x800) { // two octets
- *(result++) = static_cast<uint8_t>((cp >> 6) | 0xc0);
- *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
- }
- else if (cp < 0x10000) { // three octets
- *(result++) = static_cast<uint8_t>((cp >> 12) | 0xe0);
- *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
- *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
- }
- else { // four octets
- *(result++) = static_cast<uint8_t>((cp >> 18) | 0xf0);
- *(result++) = static_cast<uint8_t>(((cp >> 12) & 0x3f)| 0x80);
- *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
- *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
- }
- return result;
- }
-
- template <typename octet_iterator>
- uint32_t next(octet_iterator& it)
- {
- uint32_t cp = utf8::internal::mask8(*it);
- typename std::iterator_traits<octet_iterator>::difference_type length = utf8::internal::sequence_length(it);
- switch (length) {
- case 1:
- break;
- case 2:
- it++;
- cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
- break;
- case 3:
- ++it;
- cp = ((cp << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
- ++it;
- cp += (*it) & 0x3f;
- break;
- case 4:
- ++it;
- cp = ((cp << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
- ++it;
- cp += (utf8::internal::mask8(*it) << 6) & 0xfff;
- ++it;
- cp += (*it) & 0x3f;
- break;
- }
- ++it;
- return cp;
- }
-
- template <typename octet_iterator>
- uint32_t peek_next(octet_iterator it)
- {
- return utf8::unchecked::next(it);
- }
-
- template <typename octet_iterator>
- uint32_t prior(octet_iterator& it)
- {
- while (utf8::internal::is_trail(*(--it))) ;
- octet_iterator temp = it;
- return utf8::unchecked::next(temp);
- }
-
- // Deprecated in versions that include prior, but only for the sake of consistency (see utf8::previous)
- template <typename octet_iterator>
- inline uint32_t previous(octet_iterator& it)
- {
- return utf8::unchecked::prior(it);
- }
-
- template <typename octet_iterator, typename distance_type>
- void advance (octet_iterator& it, distance_type n)
- {
- for (distance_type i = 0; i < n; ++i)
- utf8::unchecked::next(it);
- }
-
- template <typename octet_iterator>
- typename std::iterator_traits<octet_iterator>::difference_type
- distance (octet_iterator first, octet_iterator last)
- {
- typename std::iterator_traits<octet_iterator>::difference_type dist;
- for (dist = 0; first < last; ++dist)
- utf8::unchecked::next(first);
- return dist;
- }
-
- template <typename u16bit_iterator, typename octet_iterator>
- octet_iterator utf16to8 (u16bit_iterator start, u16bit_iterator end, octet_iterator result)
- {
- while (start != end) {
- uint32_t cp = utf8::internal::mask16(*start++);
- // Take care of surrogate pairs first
- if (utf8::internal::is_lead_surrogate(cp)) {
- uint32_t trail_surrogate = utf8::internal::mask16(*start++);
- cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
- }
- result = utf8::unchecked::append(cp, result);
- }
- return result;
- }
-
- template <typename u16bit_iterator, typename octet_iterator>
- u16bit_iterator utf8to16 (octet_iterator start, octet_iterator end, u16bit_iterator result)
- {
- while (start < end) {
- uint32_t cp = utf8::unchecked::next(start);
- if (cp > 0xffff) { //make a surrogate pair
- *result++ = static_cast<uint16_t>((cp >> 10) + internal::LEAD_OFFSET);
- *result++ = static_cast<uint16_t>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
- }
- else
- *result++ = static_cast<uint16_t>(cp);
- }
- return result;
- }
-
- template <typename octet_iterator, typename u32bit_iterator>
- octet_iterator utf32to8 (u32bit_iterator start, u32bit_iterator end, octet_iterator result)
- {
- while (start != end)
- result = utf8::unchecked::append(*(start++), result);
-
- return result;
- }
-
- template <typename octet_iterator, typename u32bit_iterator>
- u32bit_iterator utf8to32 (octet_iterator start, octet_iterator end, u32bit_iterator result)
- {
- while (start < end)
- (*result++) = utf8::unchecked::next(start);
-
- return result;
- }
-
- // The iterator class
- template <typename octet_iterator>
- class iterator : public std::iterator <std::bidirectional_iterator_tag, uint32_t> {
- octet_iterator it;
- public:
- iterator () {}
- explicit iterator (const octet_iterator& octet_it): it(octet_it) {}
- // the default "big three" are OK
- octet_iterator base () const { return it; }
- uint32_t operator * () const
- {
- octet_iterator temp = it;
- return utf8::unchecked::next(temp);
- }
- bool operator == (const iterator& rhs) const
- {
- return (it == rhs.it);
- }
- bool operator != (const iterator& rhs) const
- {
- return !(operator == (rhs));
- }
- iterator& operator ++ ()
- {
- ::std::advance(it, utf8::internal::sequence_length(it));
- return *this;
- }
- iterator operator ++ (int)
- {
- iterator temp = *this;
- ::std::advance(it, utf8::internal::sequence_length(it));
- return temp;
- }
- iterator& operator -- ()
- {
- utf8::unchecked::prior(it);
- return *this;
- }
- iterator operator -- (int)
- {
- iterator temp = *this;
- utf8::unchecked::prior(it);
- return temp;
- }
- }; // class iterator
-
- } // namespace utf8::unchecked
-} // namespace utf8
-
-
-#endif // header guard
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 06:11:28 +0000