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#include "word_db.hh"
#include "buffer.hh"
#include "line_modification.hh"
#include "unit_tests.hh"
#include "value.hh"
#include "word_splitter.hh"
namespace Kakoune
{
WordDB& get_word_db(const Buffer& buffer)
{
static const ValueId word_db_id = get_free_value_id();
Value& cache_val = buffer.values()[word_db_id];
if (not cache_val)
cache_val = Value(WordDB{buffer});
return cache_val.as<WordDB>();
}
static ConstArrayView<Codepoint> get_extra_word_chars(const Buffer& buffer)
{
return buffer.options()["extra_word_chars"].get<Vector<Codepoint, MemoryDomain::Options>>();
}
void WordDB::add_words(StringView line, ConstArrayView<Codepoint> extra_word_chars)
{
for (auto&& w : WordSplitter{line, extra_word_chars})
{
auto hash = hash_value(w);
auto index = m_words.find_index(w, hash);
if (index >= 0)
++m_words.item(index).value.refcount;
else
{
auto word = intern(w, hash);
auto view = word->strview();
m_words.insert({view, {std::move(word), used_letters(view), 1}}, hash);
}
}
}
void WordDB::remove_words(StringView line, ConstArrayView<Codepoint> extra_word_chars)
{
for (auto&& w : WordSplitter{line, extra_word_chars})
{
auto it = m_words.find(w);
kak_assert(it != m_words.end() and it->value.refcount > 0);
if (--it->value.refcount == 0)
m_words.unordered_remove(it->key);
}
}
WordDB::WordDB(const Buffer& buffer)
: m_buffer{&buffer}
{
buffer.options().register_watcher(*this);
rebuild_db();
}
WordDB::WordDB(WordDB&& other) noexcept
: m_buffer{std::move(other.m_buffer)},
m_timestamp{other.m_timestamp},
m_words{std::move(other.m_words)},
m_lines{std::move(other.m_lines)}
{
kak_assert(m_buffer);
m_buffer->options().unregister_watcher(other);
other.m_buffer = nullptr;
m_buffer->options().register_watcher(*this);
}
WordDB::~WordDB()
{
if (m_buffer)
m_buffer->options().unregister_watcher(*this);
}
void WordDB::rebuild_db()
{
auto& buffer = *m_buffer;
m_words.clear();
m_lines.clear();
m_lines.reserve((int)buffer.line_count());
auto extra_word_chars = get_extra_word_chars(buffer);
for (auto line = 0_line, end = buffer.line_count(); line < end; ++line)
{
m_lines.push_back(buffer.line_storage(line));
add_words(m_lines.back()->strview(), extra_word_chars);
}
m_timestamp = buffer.timestamp();
}
void WordDB::update_db()
{
auto& buffer = *m_buffer;
auto modifs = compute_line_modifications(buffer, m_timestamp);
m_timestamp = buffer.timestamp();
if (modifs.empty())
return;
Lines new_lines;
new_lines.reserve((int)buffer.line_count());
auto extra_word_chars = get_extra_word_chars(buffer);
auto old_line = 0_line;
for (auto& modif : modifs)
{
kak_assert(0_line <= modif.new_line and modif.new_line <= buffer.line_count());
kak_assert(modif.new_line < buffer.line_count() or modif.num_added == 0);
kak_assert(old_line <= modif.old_line);
while (old_line < modif.old_line)
new_lines.push_back(std::move(m_lines[(int)old_line++]));
kak_assert((int)new_lines.size() == (int)modif.new_line);
while (old_line < modif.old_line + modif.num_removed)
{
kak_assert(old_line < m_lines.size());
remove_words(m_lines[(int)old_line++]->strview(), extra_word_chars);
}
for (auto l = 0_line; l < modif.num_added; ++l)
{
new_lines.push_back(buffer.line_storage(modif.new_line + l));
add_words(new_lines.back()->strview(), extra_word_chars);
}
}
while (old_line != (int)m_lines.size())
new_lines.push_back(std::move(m_lines[(int)old_line++]));
m_lines = std::move(new_lines);
}
void WordDB::on_option_changed(const Option& option)
{
if (option.name() == "extra_word_chars")
rebuild_db();
}
int WordDB::get_word_occurences(StringView word) const
{
auto it = m_words.find(word);
if (it != m_words.end())
return it->value.refcount;
return 0;
}
RankedMatchList WordDB::find_matching(StringView query)
{
update_db();
const UsedLetters letters = used_letters(query);
RankedMatchList res;
for (auto&& word : m_words)
{
if (RankedMatch match{word.key, word.value.letters, query, letters})
res.push_back(match);
}
return res;
}
UnitTest test_word_db{[]()
{
auto cmp_words = [](const RankedMatch& lhs, const RankedMatch& rhs) {
return lhs.candidate() < rhs.candidate();
};
using WordList = Vector<StringView>;
auto eq = [](ArrayView<const RankedMatch> lhs, const WordList& rhs) {
return lhs.size() == rhs.size() and
std::equal(lhs.begin(), lhs.end(), rhs.begin(),
[](const RankedMatch& lhs, const StringView& rhs) {
return lhs.candidate() == rhs;
});
};
auto make_lines = [](auto&&... lines) { return BufferLines{StringData::create(lines)...}; };
Buffer buffer("test", Buffer::Flags::None,
make_lines("tchou mutch\n", "tchou kanaky tchou\n", "\n", "tchaa tchaa\n", "allo\n"));
WordDB word_db(buffer);
auto res = word_db.find_matching("");
std::sort(res.begin(), res.end(), cmp_words);
kak_assert(eq(res, WordList{ "allo", "kanaky", "mutch", "tchaa", "tchou" }));
kak_assert(word_db.get_word_occurences("tchou") == 3);
kak_assert(word_db.get_word_occurences("allo") == 1);
buffer.erase({1, 6}, {4, 0});
res = word_db.find_matching("");
std::sort(res.begin(), res.end(), cmp_words);
kak_assert(eq(res, WordList{ "allo", "mutch", "tchou" }));
buffer.insert({1, 0}, "re");
res = word_db.find_matching("");
std::sort(res.begin(), res.end(), cmp_words);
kak_assert(eq(res, WordList{ "allo", "mutch", "retchou", "tchou" }));
}};
}
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