Aegisub/libaegisub/common/thesaurus.cpp

111 lines
3.5 KiB
C++

// Copyright (c) 2012, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/// @file thesaurus.cpp
/// @brief MyThes-compatible thesaurus implementation
/// @ingroup libaegisub thesaurus
#include "libaegisub/thesaurus.h"
#include "libaegisub/charset_conv.h"
#include "libaegisub/file_mapping.h"
#include "libaegisub/line_iterator.h"
#include "libaegisub/make_unique.h"
#include <boost/algorithm/string/split.hpp>
#include <boost/interprocess/streams/bufferstream.hpp>
namespace agi {
Thesaurus::Thesaurus(agi::fs::path const& dat_path, agi::fs::path const& idx_path)
: dat(make_unique<read_file_mapping>(dat_path))
{
read_file_mapping idx_file(idx_path);
boost::interprocess::ibufferstream idx(idx_file.read(), static_cast<size_t>(idx_file.size()));
std::string encoding_name;
getline(idx, encoding_name);
std::string unused_entry_count;
getline(idx, unused_entry_count);
conv = make_unique<charset::IconvWrapper>(encoding_name.c_str(), "utf-8");
// Read the list of words and file offsets for those words
for (auto const& line : line_iterator<std::string>(idx, encoding_name)) {
auto pos = line.find('|');
if (pos != line.npos && line.find('|', pos + 1) == line.npos)
offsets[line.substr(0, pos)] = static_cast<size_t>(atoi(line.c_str() + pos + 1));
}
}
Thesaurus::~Thesaurus() { }
std::vector<Thesaurus::Entry> Thesaurus::Lookup(std::string const& word) {
std::vector<Entry> out;
if (!dat.get()) return out;
auto it = offsets.find(word);
if (it == offsets.end()) return out;
if (it->second >= dat->size()) return out;
auto len = dat->size() - it->second;
auto buff = dat->read(it->second, len);
auto buff_end = buff + len;
std::string temp;
auto read_line = [&] (std::string& temp) -> std::string * {
auto start = buff;
auto end = std::find(buff, buff_end, '\n');
buff = end < buff_end ? end + 1 : buff_end;
if (end > start && end[-1] == '\r') --end;
temp.clear();
conv->Convert(start, end - start, temp);
return &temp;
};
// First line is the word and meaning count
std::vector<std::string> header;
boost::split(header, *read_line(temp), [](char c) { return c == '|'; });
if (header.size() != 2) return out;
int meanings = atoi(header[1].c_str());
out.reserve(meanings);
for (int i = 0; i < meanings; ++i) {
std::vector<std::string> line;
boost::split(line, *read_line(temp), [](char c) { return c == '|'; });
if (line.size() < 2)
continue;
Entry e;
// The "definition" is just the part of speech (which may be empty)
// plus the word it's giving synonyms for (which may not be the passed word)
if (!line[0].empty())
e.first = line[0] + ' ';
e.first += line[1];
e.second.reserve(line.size() - 2);
for (size_t i = 2; i < line.size(); ++i) {
if (line[i].size())
e.second.emplace_back(std::move(line[i]));
}
out.emplace_back(std::move(e));
}
return out;
}
}