236 lines
6.0 KiB
C++
236 lines
6.0 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 "zip.hpp"
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#include <boost/regex.hpp>
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#include <algorithm>
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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 std::string;
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std::vector<match> search(const fs::path &filepath, std::string_view regex,
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const options &opts)
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{
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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 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 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 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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for (const auto &entry : zip::list(filepath))
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{
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auto document{zip::read_file(filepath, entry)};
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if (!opts.raw)
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{
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cleanup_text(document);
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}
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string::const_iterator begin{document.begin()};
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string::const_iterator end{document.end()};
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boost::match_results<string::const_iterator> match_result;
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string last_headline;
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string last_page;
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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 = 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 current_headline{headline(match_result.prefix().str())};
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if (!current_headline.empty())
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{
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last_headline = current_headline;
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}
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match.headline = last_headline;
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const auto current_page{page(match_result.prefix().str())};
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if (!current_page.empty())
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{
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last_page = current_page;
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}
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match.page = last_page;
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matches.emplace_back(match);
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begin = match_result[0].second;
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}
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}
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return matches;
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}
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void cleanup_text(string &text)
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{
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size_t pos{};
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while ((pos = text.find('<', pos)) != string::npos)
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{
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// Mark headlines. We need them later on.
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string replacement;
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if (boost::regex_match(text.substr(pos, 3), boost::regex{"<[hH][1-6]"}))
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{
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replacement = "<H>";
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}
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else if (boost::regex_match(text.substr(pos, 3),
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boost::regex{"</[hH]"}))
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{
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replacement = "</H>";
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}
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else if (text.substr(pos, 5) == "<span")
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{
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auto endpos{text.find('>')};
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boost::match_results<const char *> match;
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const boost::regex re_pagebreak{".+pagebreak.+(title|aria-label)"
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"=\"([[:alnum:]]+)\".*"};
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if (boost::regex_search(text.substr(pos, endpos).data(), match,
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re_pagebreak))
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{
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replacement = "<PAGE " + match[2] + ">";
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}
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}
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text.replace(pos, text.find('>', pos) + 1 - pos, replacement);
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pos += replacement.length();
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}
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pos = 0;
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while ((pos = text.find('\r', pos)) != string::npos)
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{
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text.erase(pos, 1);
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}
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pos = 0;
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while ((pos = text.find('\n', pos)) != string::npos)
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{
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text.replace(pos, 1, " ");
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}
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pos = 0;
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while ((pos = text.find(" ", pos)) != string::npos)
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{
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text.replace(pos, 2, " ");
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}
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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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const auto &prefix{match.prefix().str()};
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const auto &suffix{match.suffix().str()};
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size_t pos_before{prefix.length()};
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size_t pos_after{};
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++words;
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while (words != 0)
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{
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if (pos_before != 0)
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{
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pos_before = prefix.rfind(' ', pos_before);
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if (pos_before != string::npos)
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{
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--pos_before;
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}
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else
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{
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pos_before = 0;
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}
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}
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if (pos_after != string::npos)
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{
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pos_after = suffix.find(' ', pos_after);
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if (pos_after != string::npos)
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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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if (pos_before != 0)
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{
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pos_before += 2;
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}
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if (pos_after != string::npos)
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{
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pos_after -= 1;
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}
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return {prefix.substr(pos_before), suffix.substr(0, pos_after)};
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}
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string headline(const std::string_view prefix)
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{
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size_t pos{prefix.length()};
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while ((pos = prefix.rfind("<H>", pos)) != std::string_view::npos)
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{
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pos += 3;
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return string{prefix.substr(pos, prefix.find('<', pos) - pos)};
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}
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return {};
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}
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string page(const std::string_view prefix)
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{
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size_t pos{prefix.length()};
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while ((pos = prefix.rfind("<PAGE ", pos)) != std::string_view::npos)
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{
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pos += 6;
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return string{prefix.substr(pos, prefix.find('>', pos) - pos)};
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}
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return {};
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}
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} // namespace epubgrep::search
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