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/* This file is part of mastodonpp.
* Copyright © 2020 tastytea <tastytea@tastytea.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "helpers.hpp"
#include <codecvt>
#include <locale>
#include <map>
#include <regex>
#include <stdexcept>
#include <string_view>
namespace mastodonpp
{
using std::codecvt_utf8;
using std::map;
using std::move;
using std::regex;
using std::regex_search;
using std::smatch;
using std::stoul;
using std::string_view;
using std::wstring_convert;
string unescape_html(string html)
{
string buffer{move(html)};
string output;
// Source: https://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_
// entity_references#Character_entity_references_in_HTML
const map<string_view, char32_t>
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.
wstring_convert<codecvt_utf8<char32_t>, char32_t> u8c;
// Matches numbered entities between 1 and 8 digits, decimal or hexadecimal,
// or named entities.
const regex re_entity{"&(#(x)?([[:alnum:]]{1,8})"
"|[^;[:space:][:punct:]]+);"};
smatch match;
while (regex_search(buffer, match, re_entity))
{
output += match.prefix().str();
try
{
// clang-format off
const char32_t codepoint{[&match, &names]
{
// clang-format on
// 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<char32_t>(
stoul(match[3].str(), nullptr, 16));
}
// '#' without 'x' means the number is decimal.
return static_cast<char32_t>(
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();
}
buffer = match.suffix().str();
}
output += buffer;
return output;
}
} // namespace mastodonpp
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