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Speed up WordSplitter

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Only do utf8 decoding once per codepoint instead of twice, limit
the byte length instead of the codepoint length.
This commit is contained in:
Maxime Coste 2023-10-25 12:52:14 +11:00
parent b33b673f10
commit be33dee211
2 changed files with 11 additions and 20 deletions
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29
src/word_db.cc
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@ -34,30 +34,21 @@ struct WordSplitter
const auto* end = m_splitter->m_content.end();
auto extra_chars = m_splitter->m_extra_word_chars;
while (true)
do
{
m_word_begin = m_word_end;
while (m_word_begin != end and not is_word(utf8::codepoint(m_word_begin, end), extra_chars))
utf8::to_next(m_word_begin, end);
m_word_end = m_word_begin;
CharCount word_len = 0;
while (m_word_end != end and is_word(utf8::codepoint(m_word_end, end), extra_chars))
{
utf8::to_next(m_word_end, end);
++word_len;
}
if (m_word_begin == end or word_len < WordDB::max_word_len)
break;
}
auto it = m_word_begin = m_word_end;
while (it != end and not is_word(utf8::read_codepoint(it, end), extra_chars))
m_word_begin = it;
m_word_end = it;
while (it != end and is_word(utf8::read_codepoint(it, end), extra_chars))
m_word_end = it;
} while (m_word_begin != end and (m_word_end - m_word_begin) > WordDB::max_word_len);
return *this;
}
friend bool operator==(const Iterator& lhs, const Iterator& rhs)
{ return lhs.m_word_begin == rhs.m_word_begin and lhs.m_word_end == rhs.m_word_end; }
friend bool operator!=(const Iterator& lhs, const Iterator& rhs)
{ return not (lhs == rhs); }
friend bool operator==(const Iterator& lhs, const Iterator& rhs) = default;
const char* m_word_begin;
const char* m_word_end;

2
src/word_db.hh
View File

@ -18,7 +18,7 @@ class Buffer;
class WordDB : public OptionManagerWatcher
{
public:
static constexpr CharCount max_word_len = 50;
static constexpr ByteCount max_word_len = 50;
WordDB(const Buffer& buffer);
~WordDB();