#include "helpers.hpp" #include #include #include #include #include #include namespace epubgrep::helpers { bool is_whitespace(const char check) { const std::array whitespace{' ', '\n', '\r', '\t'}; return std::any_of(whitespace.begin(), whitespace.end(), [&check](const char ws) { return check == ws; }); } std::string urldecode(const std::string_view url) { // RFC 3986, section 2.1. size_t pos{0}; size_t lastpos{0}; std::string decoded; while ((pos = url.find('%', pos)) != std::string_view::npos) { decoded += url.substr(lastpos, pos - lastpos); decoded += static_cast( std::stoul(std::string(url.substr(pos + 1, 2)), nullptr, 16)); pos += 3; lastpos = pos; } decoded += url.substr(lastpos); return decoded; } std::string unescape_html(const std::string_view html) { std::string output; output.reserve(html.size()); // Source: https://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_ // entity_references#Character_entity_references_in_HTML static const std::map names{{"exclamation", 0x0021}, {"quot", 0x0022}, {"percent", 0x0025}, {"amp", 0x0026}, {"apos", 0x0027}, {"add", 0x002B}, {"lt", 0x003C}, {"equal", 0x003D}, {"gt", 0x003E}, {"nbsp", 0x00A0}, {"iexcl", 0x00A1}, {"cent", 0x00A2}, {"pound", 0x00A3}, {"curren", 0x00A4}, {"yen", 0x00A5}, {"brvbar", 0x00A6}, {"sect", 0x00A7}, {"uml", 0x00A8}, {"copy", 0x00A9}, {"ordf", 0x00AA}, {"laquo", 0x00AB}, {"not", 0x00AC}, {"shy", 0x00AD}, {"reg", 0x00AE}, {"macr", 0x00AF}, {"deg", 0x00B0}, {"plusmn", 0x00B1}, {"sup2", 0x00B2}, {"sup3", 0x00B3}, {"acute", 0x00B4}, {"micro", 0x00B5}, {"para", 0x00B6}, {"middot", 0x00B7}, {"cedil", 0x00B8}, {"sup1", 0x00B9}, {"ordm", 0x00BA}, {"raquo", 0x00BB}, {"frac14", 0x00BC}, {"frac12", 0x00BD}, {"frac34", 0x00BE}, {"iquest", 0x00BF}, {"Agrave", 0x00C0}, {"Aacute", 0x00C1}, {"Acirc", 0x00C2}, {"Atilde", 0x00C3}, {"Auml", 0x00C4}, {"Aring", 0x00C5}, {"AElig", 0x00C6}, {"Ccedil", 0x00C7}, {"Egrave", 0x00C8}, {"Eacute", 0x00C9}, {"Ecirc", 0x00CA}, {"Euml", 0x00CB}, {"Igrave", 0x00CC}, {"Iacute", 0x00CD}, {"Icirc", 0x00CE}, {"Iuml", 0x00CF}, {"ETH", 0x00D0}, {"Ntilde", 0x00D1}, {"Ograve", 0x00D2}, {"Oacute", 0x00D3}, {"Ocirc", 0x00D4}, {"Otilde", 0x00D5}, {"Ouml", 0x00D6}, {"times", 0x00D7}, {"Oslash", 0x00D8}, {"Ugrave", 0x00D9}, {"Uacute", 0x00DA}, {"Ucirc", 0x00DB}, {"Uuml", 0x00DC}, {"Yacute", 0x00DD}, {"THORN", 0x00DE}, {"szlig", 0x00DF}, {"agrave", 0x00E0}, {"aacute", 0x00E1}, {"acirc", 0x00E2}, {"atilde", 0x00E3}, {"auml", 0x00E4}, {"aring", 0x00E5}, {"aelig", 0x00E6}, {"ccedil", 0x00E7}, {"egrave", 0x00E8}, {"eacute", 0x00E9}, {"ecirc", 0x00EA}, {"euml", 0x00EB}, {"igrave", 0x00EC}, {"iacute", 0x00ED}, {"icirc", 0x00EE}, {"iuml", 0x00EF}, {"eth", 0x00F0}, {"ntilde", 0x00F1}, {"ograve", 0x00F2}, {"oacute", 0x00F3}, {"ocirc", 0x00F4}, {"otilde", 0x00F5}, {"ouml", 0x00F6}, {"divide", 0x00F7}, {"oslash", 0x00F8}, {"ugrave", 0x00F9}, {"uacute", 0x00FA}, {"ucirc", 0x00FB}, {"uuml", 0x00FC}, {"yacute", 0x00FD}, {"thorn", 0x00FE}, {"yuml", 0x00FF}, {"OElig", 0x0152}, {"oelig", 0x0153}, {"Scaron", 0x0160}, {"scaron", 0x0161}, {"Yuml", 0x0178}, {"fnof", 0x0192}, {"circ", 0x02C6}, {"tilde", 0x02DC}, {"Alpha", 0x0391}, {"Beta", 0x0392}, {"Gamma", 0x0393}, {"Delta", 0x0394}, {"Epsilon", 0x0395}, {"Zeta", 0x0396}, {"Eta", 0x0397}, {"Theta", 0x0398}, {"Iota", 0x0399}, {"Kappa", 0x039A}, {"Lambda", 0x039B}, {"Mu", 0x039C}, {"Nu", 0x039D}, {"Xi", 0x039E}, {"Omicron", 0x039F}, {"Pi", 0x03A0}, {"Rho", 0x03A1}, {"Sigma", 0x03A3}, {"Tau", 0x03A4}, {"Upsilon", 0x03A5}, {"Phi", 0x03A6}, {"Chi", 0x03A7}, {"Psi", 0x03A8}, {"Omega", 0x03A9}, {"alpha", 0x03B1}, {"beta", 0x03B2}, {"gamma", 0x03B3}, {"delta", 0x03B4}, {"epsilon", 0x03B5}, {"zeta", 0x03B6}, {"eta", 0x03B7}, {"theta", 0x03B8}, {"iota", 0x03B9}, {"kappa", 0x03BA}, {"lambda", 0x03BB}, {"mu", 0x03BC}, {"nu", 0x03BD}, {"xi", 0x03BE}, {"omicron", 0x03BF}, {"pi", 0x03C0}, {"rho", 0x03C1}, {"sigmaf", 0x03C2}, {"sigma", 0x03C3}, {"tau", 0x03C4}, {"upsilon", 0x03C5}, {"phi", 0x03C6}, {"chi", 0x03C7}, {"psi", 0x03C8}, {"omega", 0x03C9}, {"thetasym", 0x03D1}, {"upsih", 0x03D2}, {"piv", 0x03D6}, {"ensp", 0x2002}, {"emsp", 0x2003}, {"thinsp", 0x2009}, {"zwnj", 0x200C}, {"zwj", 0x200D}, {"lrm", 0x200E}, {"rlm", 0x200F}, {"ndash", 0x2013}, {"mdash", 0x2014}, {"horbar", 0x2015}, {"lsquo", 0x2018}, {"rsquo", 0x2019}, {"sbquo", 0x201A}, {"ldquo", 0x201C}, {"rdquo", 0x201D}, {"bdquo", 0x201E}, {"dagger", 0x2020}, {"Dagger", 0x2021}, {"bull", 0x2022}, {"hellip", 0x2026}, {"permil", 0x2030}, {"prime", 0x2032}, {"Prime", 0x2033}, {"lsaquo", 0x2039}, {"rsaquo", 0x203A}, {"oline", 0x203E}, {"frasl", 0x2044}, {"euro", 0x20AC}, {"image", 0x2111}, {"weierp", 0x2118}, {"real", 0x211C}, {"trade", 0x2122}, {"alefsym", 0x2135}, {"larr", 0x2190}, {"uarr", 0x2191}, {"rarr", 0x2192}, {"darr", 0x2193}, {"harr", 0x2194}, {"crarr", 0x21B5}, {"lArr", 0x21D0}, {"uArr", 0x21D1}, {"rArr", 0x21D2}, {"dArr", 0x21D3}, {"hArr", 0x21D4}, {"forall", 0x2200}, {"part", 0x2202}, {"exist", 0x2203}, {"empty", 0x2205}, {"nabla", 0x2207}, {"isin", 0x2208}, {"notin", 0x2209}, {"ni", 0x220B}, {"prod", 0x220F}, {"sum", 0x2211}, {"minus", 0x2212}, {"lowast", 0x2217}, {"radic", 0x221A}, {"prop", 0x221D}, {"infin", 0x221E}, {"ang", 0x2220}, {"and", 0x2227}, {"or", 0x2228}, {"cap", 0x2229}, {"cup", 0x222A}, {"int", 0x222B}, {"there4", 0x2234}, {"sim", 0x223C}, {"cong", 0x2245}, {"asymp", 0x2248}, {"ne", 0x2260}, {"equiv", 0x2261}, {"le", 0x2264}, {"ge", 0x2265}, {"sub", 0x2282}, {"sup", 0x2283}, {"nsub", 0x2284}, {"sube", 0x2286}, {"supe", 0x2287}, {"oplus", 0x2295}, {"otimes", 0x2297}, {"perp", 0x22A5}, {"sdot", 0x22C5}, {"lceil", 0x2308}, {"rceil", 0x2309}, {"lfloor", 0x230A}, {"rfloor", 0x230B}, {"lang", 0x2329}, {"rang", 0x232A}, {"loz", 0x25CA}, {"spades", 0x2660}, {"clubs", 0x2663}, {"hearts", 0x2665}, {"diams", 0x2666}}; // Used to convert number to utf-8 char. std::wstring_convert, char32_t> u8c; // Matches numbered entities between 1 and 8 digits, decimal or hexadecimal, // or named entities. static const boost::regex re_entity{"&(#(x)?([[:alnum:]]{1,8})" "|[^;[:space:][:punct:]]+);"}; std::string::const_iterator begin{html.begin()}; std::string::const_iterator end{html.end()}; boost::match_results match; // Used for appending the rest of the text, after the last replacement. std::string::const_iterator end_last_match{begin}; while (boost::regex_search(begin, end, match, re_entity)) { output += match.prefix(); try { const char32_t codepoint{ [&match] { // If it doesn't start with a '#' it is a named entity. if (match[1].str()[0] != '#') { return names.at(match[1].str()); } // 'x' after '#' means the number is hexadecimal. if (match[2].length() == 1) { return static_cast( std::stoul(match[3].str(), nullptr, 16)); } // '#' without 'x' means the number is decimal. return static_cast( std::stoul(match[3].str(), nullptr, 10)); }()}; output += u8c.to_bytes(codepoint); } catch (const std::out_of_range &) // Named entity could not be found. { output += match.str(); } begin = match[0].end(); end_last_match = begin; } output += std::string(end_last_match, end); return output; } std::string_view get_env(const std::string_view name) { const char *env = std::getenv(name.data()); if (env != nullptr) { return env; } return {}; } } // namespace epubgrep::helpers