303 lines
8.5 KiB
C++
303 lines
8.5 KiB
C++
/* This file is part of epubgrep.
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* Copyright © 2021 tastytea <tastytea@tastytea.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "search.hpp"
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#include "fs-compat.hpp"
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#include "helpers.hpp"
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#include "log.hpp"
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#include "zip.hpp"
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#include <boost/regex.hpp>
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#include <fmt/format.h>
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#include <fmt/ostream.h> // For compatibility with fmt 4.
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#include <algorithm>
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#include <array>
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#include <iterator>
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#include <memory>
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#include <string>
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#include <string_view>
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#include <vector>
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namespace epubgrep::search
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{
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using fmt::format;
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using std::string;
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std::vector<match> search(const fs::path &filepath,
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const std::string_view regex, const settings &opts)
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{
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LOG(log::sev::info)
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<< format(R"(Starting search in {0:s} using regex "{1:s}")", filepath,
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regex);
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boost::regex::flag_type flags{};
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switch (opts.regex)
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{
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case options::regex_kind::basic:
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{
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flags = opts.grep_like ? boost::regex::grep : boost::regex::basic;
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break;
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}
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case options::regex_kind::extended:
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{
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flags = opts.grep_like ? boost::regex::egrep : boost::regex::extended;
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break;
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}
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case options::regex_kind::perl:
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{
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flags = boost::regex::perl;
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break;
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}
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}
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if (opts.ignore_case)
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{
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flags |= boost::regex::icase;
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}
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const boost::regex re(regex.data(), flags);
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std::vector<match> matches;
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std::vector<string> epub_filepaths{[&opts, &filepath]
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{
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if (!opts.raw)
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{
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return zip::list_spine(filepath);
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}
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return zip::list(filepath);
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}()};
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for (const auto &entry : epub_filepaths)
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{
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DEBUGLOG << "Processing " << entry;
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file_in_epub file;
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{
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const auto document{zip::read_file(filepath, entry)};
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if (!opts.raw)
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{
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file = cleanup_text(helpers::unescape_html(document));
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}
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else
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{
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file.text = document;
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}
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}
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string::const_iterator begin{file.text.begin()};
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string::const_iterator end{file.text.end()};
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auto begin_text{begin};
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boost::match_results<string::const_iterator> match_result;
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while (boost::regex_search(begin, end, match_result, re,
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boost::match_default))
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{
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match match; // FIXME: Rename variable or struct.
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match.filepath_epub = filepath;
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match.filepath_inside = entry;
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match.text = match_result[0];
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match.context = context(match_result, opts.context);
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const auto pos = static_cast<size_t>(
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std::distance(begin_text, match_result[0].begin()));
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match.headline = headline(file, pos);
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match.page = page(file, pos);
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matches.emplace_back(match);
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begin = match_result[0].end();
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}
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}
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return matches;
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}
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file_in_epub cleanup_text(const std::string_view text)
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{
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string output{text};
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static const boost::regex re_header_start{"<[hH][1-6]"};
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static const boost::regex re_header_end{"</[hH][1-6]"};
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static const boost::regex re_pagebreak{"[^>]+pagebreak[^>]+"
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"(title|aria-label)"
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"=\"([[:alnum:]]+)\""};
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// TODO: Make this more efficient, 3 → 1;
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size_t pos{0};
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while ((pos = output.find('\r', pos)) != string::npos)
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{
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output.erase(pos, 1);
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}
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pos = 0;
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while ((pos = output.find_first_of("\n\t", pos)) != string::npos)
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{
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output.replace(pos, 1, " ");
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}
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pos = 0;
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while ((pos = output.find(" ", pos)) != string::npos)
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{
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output.replace(pos, 2, " ");
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}
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pos = 0;
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file_in_epub file;
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size_t headline_start{string::npos};
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while ((pos = output.find('<', pos)) != string::npos)
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{
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auto endpos{output.find('>', pos) + 1};
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if (boost::regex_match(output.substr(pos, 3), re_header_start))
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{
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headline_start = pos;
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}
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else if (boost::regex_match(output.substr(pos, 4), re_header_end))
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{
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if (headline_start != string::npos)
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{
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file.headlines.insert(
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{headline_start,
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output.substr(headline_start, pos - headline_start)});
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headline_start = string::npos;
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}
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}
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else if (output.substr(pos, 6) == "<span ")
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{
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boost::match_results<string::const_iterator> match;
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using it_size_t = string::const_iterator::difference_type;
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string::const_iterator begin{output.begin()
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+ static_cast<it_size_t>(pos)};
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string::const_iterator end{output.begin()
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+ static_cast<it_size_t>(endpos)};
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if (boost::regex_search(begin, end, match, re_pagebreak))
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{
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file.pages.insert({pos, match[2].str()});
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}
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}
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else if (output.substr(pos, 7) == "<style "
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|| output.substr(pos, 8) == "<script ")
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{
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if (output.find("/>", pos) > endpos)
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{
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endpos = output.find('>', endpos) + 1;
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}
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}
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output.erase(pos, endpos - pos);
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}
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file.text = output;
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return file;
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}
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match_context context(const boost::match_results<string::const_iterator> &match,
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std::uint64_t words)
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{
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if (words == 0)
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{
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return {};
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}
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++words;
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const auto &rbegin_before{std::reverse_iterator(match.prefix().end())};
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const auto &rend_before{std::reverse_iterator(match.prefix().begin())};
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const auto &begin_after{match.suffix().begin()};
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const auto &end_after{match.suffix().end()};
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auto pos_before{rbegin_before};
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auto pos_after{begin_after};
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const std::array<char, 4> whitespace{' ', '\n', '\r', '\t'};
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while (words != 0)
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{
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if (pos_before != rend_before)
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{
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pos_before = std::find_first_of(pos_before, rend_before,
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whitespace.begin(),
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whitespace.end());
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while (pos_before != rend_before
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&& helpers::is_whitespace(*pos_before))
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{
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++pos_before;
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}
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}
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if (pos_after != end_after)
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{
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pos_after = std::find_first_of(pos_after, end_after,
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whitespace.begin(),
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whitespace.end());
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while (pos_after != end_after && helpers::is_whitespace(*pos_after))
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{
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++pos_after;
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}
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}
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words -= 1;
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}
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const string before_reversed(rbegin_before, pos_before);
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string before(before_reversed.rbegin(), before_reversed.rend());
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string after(begin_after, pos_after);
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while (helpers::is_whitespace(*before.begin()))
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{
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before.erase(0, 1);
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}
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while (helpers::is_whitespace(*after.rbegin()))
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{
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after.erase(after.size() - 1);
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}
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return {before, after};
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}
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std::string headline(const file_in_epub &file, const size_t pos)
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{
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std::string_view last;
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for (const auto &pair : file.headlines)
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{
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if (pair.first > pos)
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{
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break;
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}
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last = pair.second;
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}
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return string(last);
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}
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string page(const file_in_epub &file, const size_t pos)
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{
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std::string_view last;
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for (const auto &pair : file.pages)
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{
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if (pair.first > pos)
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{
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break;
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}
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last = pair.second;
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}
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return string(last);
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}
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} // namespace epubgrep::search
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