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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
// Copyright (c) 2021-2025 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/locale/boundary.hpp>
#include <boost/locale/generator.hpp>
#include "../util/encoding.hpp"
#include "all_generator.hpp"
#include "cdata.hpp"
#include "icu_util.hpp"
#include "uconv.hpp"
#if BOOST_LOCALE_ICU_VERSION >= 5502
# include <unicode/utext.h>
#endif
#include <memory>
#include <unicode/brkiter.h>
#include <unicode/rbbi.h>
#include <vector>
#ifdef BOOST_MSVC
# pragma warning(disable : 4244) // 'argument' : conversion from 'int'
# pragma warning(disable : 4267) // 'argument' : conversion from 'size_t'
#endif
#if BOOST_LOCALE_ICU_VERSION >= 5502
namespace std {
template<>
struct default_delete<UText> {
using pointer = UText*;
void operator()(pointer ptr) { utext_close(ptr); }
};
} // namespace std
#endif
namespace boost { namespace locale {
namespace boundary { namespace impl_icu {
using namespace boost::locale::impl_icu;
index_type map_direct(boundary_type t, icu::BreakIterator* it, int reserve)
{
index_type indx;
indx.reserve(reserve);
#if U_ICU_VERSION_MAJOR_NUM >= 52
icu::BreakIterator* rbbi = it;
#else
icu::RuleBasedBreakIterator* rbbi = icu_cast<icu::RuleBasedBreakIterator>(it);
#endif
indx.push_back(break_info());
it->first();
int pos = 0;
while((pos = it->next()) != icu::BreakIterator::DONE) {
indx.push_back(break_info(pos));
// Character does not have any specific break types
if(t != character && rbbi) {
std::vector<int32_t> buffer;
int32_t membuf[8] = {0}; // try not to use memory allocation if possible
int32_t* buf = membuf;
UErrorCode err = U_ZERO_ERROR;
int n = rbbi->getRuleStatusVec(buf, 8, err);
if(err == U_BUFFER_OVERFLOW_ERROR) {
buffer.resize(n, 0);
buf = buffer.data();
n = rbbi->getRuleStatusVec(buf, buffer.size(), err);
}
check_and_throw_icu_error(err);
for(int i = 0; i < n; i++) {
switch(t) {
case word:
if(UBRK_WORD_NONE <= buf[i] && buf[i] < UBRK_WORD_NONE_LIMIT)
indx.back().rule |= word_none;
else if(UBRK_WORD_NUMBER <= buf[i] && buf[i] < UBRK_WORD_NUMBER_LIMIT)
indx.back().rule |= word_number;
else if(UBRK_WORD_LETTER <= buf[i] && buf[i] < UBRK_WORD_LETTER_LIMIT)
indx.back().rule |= word_letter;
else if(UBRK_WORD_KANA <= buf[i] && buf[i] < UBRK_WORD_KANA_LIMIT)
indx.back().rule |= word_kana;
else if(UBRK_WORD_IDEO <= buf[i] && buf[i] < UBRK_WORD_IDEO_LIMIT)
indx.back().rule |= word_ideo;
break;
case line:
if(UBRK_LINE_SOFT <= buf[i] && buf[i] < UBRK_LINE_SOFT_LIMIT)
indx.back().rule |= line_soft;
else if(UBRK_LINE_HARD <= buf[i] && buf[i] < UBRK_LINE_HARD_LIMIT)
indx.back().rule |= line_hard;
break;
case sentence:
if(UBRK_SENTENCE_TERM <= buf[i] && buf[i] < UBRK_SENTENCE_TERM_LIMIT)
indx.back().rule |= sentence_term;
else if(UBRK_SENTENCE_SEP <= buf[i] && buf[i] < UBRK_SENTENCE_SEP_LIMIT)
indx.back().rule |= sentence_sep;
break;
case character: BOOST_UNREACHABLE_RETURN(0);
}
}
} else
indx.back().rule |= character_any; // Basic mark... for character
}
return indx;
}
std::unique_ptr<icu::BreakIterator> get_iterator(boundary_type t, const icu::Locale& loc)
{
UErrorCode err = U_ZERO_ERROR;
std::unique_ptr<icu::BreakIterator> bi;
switch(t) {
case character: bi.reset(icu::BreakIterator::createCharacterInstance(loc, err)); break;
case word: bi.reset(icu::BreakIterator::createWordInstance(loc, err)); break;
case sentence: bi.reset(icu::BreakIterator::createSentenceInstance(loc, err)); break;
case line: bi.reset(icu::BreakIterator::createLineInstance(loc, err)); break;
}
check_and_throw_icu_error(err);
if(!bi)
throw std::runtime_error("Failed to create break iterator");
return bi;
}
template<typename CharType>
index_type do_map(boundary_type t,
const CharType* begin,
const CharType* end,
const icu::Locale& loc,
const std::string& encoding)
{
std::unique_ptr<icu::BreakIterator> bi = get_iterator(t, loc);
// Versions prior to ICU 55.2 returned wrong splits when used with UText input
#if BOOST_LOCALE_ICU_VERSION >= 5502
UErrorCode err = U_ZERO_ERROR;
BOOST_LOCALE_START_CONST_CONDITION
if(sizeof(CharType) == 2 || util::is_char8_t<CharType>::value
|| (sizeof(CharType) == 1 && util::normalize_encoding(encoding) == "utf8"))
{
UText ut_stack = UTEXT_INITIALIZER;
std::unique_ptr<UText> ut;
if(sizeof(CharType) == 1)
ut.reset(utext_openUTF8(&ut_stack, reinterpret_cast<const char*>(begin), end - begin, &err));
else {
static_assert(sizeof(UChar) == 2, "!");
ut.reset(utext_openUChars(&ut_stack, reinterpret_cast<const UChar*>(begin), end - begin, &err));
}
BOOST_LOCALE_END_CONST_CONDITION
check_and_throw_icu_error(err);
err = U_ZERO_ERROR;
if(!ut)
throw std::runtime_error("Failed to create UText");
bi->setText(ut.get(), err);
check_and_throw_icu_error(err);
return map_direct(t, bi.get(), end - begin);
} else
#endif
{
icu_std_converter<CharType> cvt(encoding);
const icu::UnicodeString str = cvt.icu(begin, end);
bi->setText(str);
const index_type indirect = map_direct(t, bi.get(), str.length());
index_type indx = indirect;
for(size_t i = 1; i < indirect.size(); i++) {
const size_t offset_indirect = indirect[i - 1].offset;
const size_t diff = indirect[i].offset - offset_indirect;
const size_t offset_direct = indx[i - 1].offset;
indx[i].offset = offset_direct + cvt.cut(str, begin, end, diff, offset_indirect, offset_direct);
}
return indx;
}
} // do_map
template<typename CharType>
class boundary_indexing_impl : public boundary_indexing<CharType> {
public:
boundary_indexing_impl(const cdata& data) : locale_(data.locale()), encoding_(data.encoding()) {}
index_type map(boundary_type t, const CharType* begin, const CharType* end) const
{
return do_map<CharType>(t, begin, end, locale_, encoding_);
}
private:
icu::Locale locale_;
std::string encoding_;
};
}} // namespace boundary::impl_icu
namespace impl_icu {
std::locale create_boundary(const std::locale& in, const cdata& cd, char_facet_t type)
{
using namespace boost::locale::boundary::impl_icu;
switch(type) {
case char_facet_t::nochar: break;
case char_facet_t::char_f: return std::locale(in, new boundary_indexing_impl<char>(cd));
case char_facet_t::wchar_f: return std::locale(in, new boundary_indexing_impl<wchar_t>(cd));
#ifdef __cpp_char8_t
case char_facet_t::char8_f: return std::locale(in, new boundary_indexing_impl<char8_t>(cd));
#endif
#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
case char_facet_t::char16_f: return std::locale(in, new boundary_indexing_impl<char16_t>(cd));
#endif
#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
case char_facet_t::char32_f: return std::locale(in, new boundary_indexing_impl<char32_t>(cd));
#endif
}
return in;
}
} // namespace impl_icu
}} // namespace boost::locale
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