327 lines
12 KiB
C++
327 lines
12 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_CHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
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#define UTF8_FOR_CPP_CHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
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#include "core.h"
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#include <stdexcept>
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namespace utf8
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{
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// Base for the exceptions that may be thrown from the library
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class exception : public ::std::exception {
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};
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// Exceptions that may be thrown from the library functions.
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class invalid_code_point : public exception {
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uint32_t cp;
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public:
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invalid_code_point(uint32_t cp) : cp(cp) {}
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virtual const char* what() const throw() { return "Invalid code point"; }
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uint32_t code_point() const {return cp;}
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};
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class invalid_utf8 : public exception {
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uint8_t u8;
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public:
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invalid_utf8 (uint8_t u) : u8(u) {}
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virtual const char* what() const throw() { return "Invalid UTF-8"; }
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uint8_t utf8_octet() const {return u8;}
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};
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class invalid_utf16 : public exception {
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uint16_t u16;
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public:
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invalid_utf16 (uint16_t u) : u16(u) {}
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virtual const char* what() const throw() { return "Invalid UTF-16"; }
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uint16_t utf16_word() const {return u16;}
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};
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class not_enough_room : public exception {
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public:
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virtual const char* what() const throw() { return "Not enough space"; }
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};
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/// The library API - functions intended to be called by the users
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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 (!utf8::internal::is_code_point_valid(cp))
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throw invalid_code_point(cp);
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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, typename output_iterator>
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output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out, uint32_t replacement)
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{
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while (start != end) {
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octet_iterator sequence_start = start;
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internal::utf_error err_code = utf8::internal::validate_next(start, end);
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switch (err_code) {
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case internal::UTF8_OK :
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for (octet_iterator it = sequence_start; it != start; ++it)
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*out++ = *it;
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break;
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case internal::NOT_ENOUGH_ROOM:
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throw not_enough_room();
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case internal::INVALID_LEAD:
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out = utf8::append (replacement, out);
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++start;
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break;
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case internal::INCOMPLETE_SEQUENCE:
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case internal::OVERLONG_SEQUENCE:
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case internal::INVALID_CODE_POINT:
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out = utf8::append (replacement, out);
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++start;
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// just one replacement mark for the sequence
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while (start != end && utf8::internal::is_trail(*start))
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++start;
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break;
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}
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}
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return out;
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}
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template <typename octet_iterator, typename output_iterator>
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inline output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out)
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{
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static const uint32_t replacement_marker = utf8::internal::mask16(0xfffd);
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return utf8::replace_invalid(start, end, out, replacement_marker);
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}
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template <typename octet_iterator>
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uint32_t next(octet_iterator& it, octet_iterator end)
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{
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uint32_t cp = 0;
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internal::utf_error err_code = utf8::internal::validate_next(it, end, cp);
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switch (err_code) {
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case internal::UTF8_OK :
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break;
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case internal::NOT_ENOUGH_ROOM :
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throw not_enough_room();
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case internal::INVALID_LEAD :
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case internal::INCOMPLETE_SEQUENCE :
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case internal::OVERLONG_SEQUENCE :
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throw invalid_utf8(*it);
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case internal::INVALID_CODE_POINT :
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throw invalid_code_point(cp);
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}
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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, octet_iterator end)
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{
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return utf8::next(it, end);
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}
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template <typename octet_iterator>
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uint32_t prior(octet_iterator& it, octet_iterator start)
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{
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// can't do much if it == start
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if (it == start)
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throw not_enough_room();
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octet_iterator end = it;
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// Go back until we hit either a lead octet or start
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while (utf8::internal::is_trail(*(--it)))
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if (it == start)
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throw invalid_utf8(*it); // error - no lead byte in the sequence
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return utf8::peek_next(it, end);
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}
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/// Deprecated in versions that include "prior"
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template <typename octet_iterator>
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uint32_t previous(octet_iterator& it, octet_iterator pass_start)
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{
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octet_iterator end = it;
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while (utf8::internal::is_trail(*(--it)))
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if (it == pass_start)
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throw invalid_utf8(*it); // error - no lead byte in the sequence
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octet_iterator temp = it;
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return utf8::next(temp, end);
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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, octet_iterator end)
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{
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for (distance_type i = 0; i < n; ++i)
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utf8::next(it, end);
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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::next(first, last);
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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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if (start != end) {
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uint32_t trail_surrogate = utf8::internal::mask16(*start++);
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if (utf8::internal::is_trail_surrogate(trail_surrogate))
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cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
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else
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throw invalid_utf16(static_cast<uint16_t>(trail_surrogate));
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}
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else
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throw invalid_utf16(static_cast<uint16_t>(cp));
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}
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// Lone trail surrogate
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else if (utf8::internal::is_trail_surrogate(cp))
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throw invalid_utf16(static_cast<uint16_t>(cp));
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result = utf8::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::next(start, end);
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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::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::next(start, end);
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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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octet_iterator range_start;
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octet_iterator range_end;
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public:
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iterator () {}
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explicit iterator (const octet_iterator& octet_it,
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const octet_iterator& range_start,
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const octet_iterator& range_end) :
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it(octet_it), range_start(range_start), range_end(range_end)
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{
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if (it < range_start || it > range_end)
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throw std::out_of_range("Invalid utf-8 iterator position");
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}
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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::next(temp, range_end);
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}
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bool operator == (const iterator& rhs) const
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{
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if (range_start != rhs.range_start || range_end != rhs.range_end)
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throw std::logic_error("Comparing utf-8 iterators defined with different ranges");
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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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utf8::next(it, range_end);
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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::next(it, range_end);
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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::prior(it, range_start);
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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::prior(it, range_start);
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return temp;
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}
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}; // class iterator
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} // namespace utf8
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#endif //header guard
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