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