// HTML 支持的数学符号
function strNumDiscode(str) {
  str = str.replace(/&forall;/g, '∀');
  str = str.replace(/&part;/g, '∂');
  str = str.replace(/&exist;/g, '∃');
  str = str.replace(/&empty;/g, '∅');
  str = str.replace(/&nabla;/g, '∇');
  str = str.replace(/&isin;/g, '∈');
  str = str.replace(/&notin;/g, '∉');
  str = str.replace(/&ni;/g, '∋');
  str = str.replace(/&prod;/g, '∏');
  str = str.replace(/&sum;/g, '∑');
  str = str.replace(/&minus;/g, '−');
  str = str.replace(/&lowast;/g, '∗');
  str = str.replace(/&radic;/g, '√');
  str = str.replace(/&prop;/g, '∝');
  str = str.replace(/&infin;/g, '∞');
  str = str.replace(/&ang;/g, '∠');
  str = str.replace(/&and;/g, '∧');
  str = str.replace(/&or;/g, '∨');
  str = str.replace(/&cap;/g, '∩');
  str = str.replace(/&cup;/g, '∪');
  str = str.replace(/&int;/g, '∫');
  str = str.replace(/&there4;/g, '∴');
  str = str.replace(/&sim;/g, '∼');
  str = str.replace(/&cong;/g, '≅');
  str = str.replace(/&asymp;/g, '≈');
  str = str.replace(/&ne;/g, '≠');
  str = str.replace(/&le;/g, '≤');
  str = str.replace(/&ge;/g, '≥');
  str = str.replace(/&sub;/g, '⊂');
  str = str.replace(/&sup;/g, '⊃');
  str = str.replace(/&nsub;/g, '⊄');
  str = str.replace(/&sube;/g, '⊆');
  str = str.replace(/&supe;/g, '⊇');
  str = str.replace(/&oplus;/g, '⊕');
  str = str.replace(/&otimes;/g, '⊗');
  str = str.replace(/&perp;/g, '⊥');
  str = str.replace(/&sdot;/g, '⋅');
  return str;
}

// HTML 支持的希腊字母
function strGreeceDiscode(str) {
  str = str.replace(/&Alpha;/g, 'Α');
  str = str.replace(/&Beta;/g, 'Β');
  str = str.replace(/&Gamma;/g, 'Γ');
  str = str.replace(/&Delta;/g, 'Δ');
  str = str.replace(/&Epsilon;/g, 'Ε');
  str = str.replace(/&Zeta;/g, 'Ζ');
  str = str.replace(/&Eta;/g, 'Η');
  str = str.replace(/&Theta;/g, 'Θ');
  str = str.replace(/&Iota;/g, 'Ι');
  str = str.replace(/&Kappa;/g, 'Κ');
  str = str.replace(/&Lambda;/g, 'Λ');
  str = str.replace(/&Mu;/g, 'Μ');
  str = str.replace(/&Nu;/g, 'Ν');
  str = str.replace(/&Xi;/g, 'Ν');
  str = str.replace(/&Omicron;/g, 'Ο');
  str = str.replace(/&Pi;/g, 'Π');
  str = str.replace(/&Rho;/g, 'Ρ');
  str = str.replace(/&Sigma;/g, 'Σ');
  str = str.replace(/&Tau;/g, 'Τ');
  str = str.replace(/&Upsilon;/g, 'Υ');
  str = str.replace(/&Phi;/g, 'Φ');
  str = str.replace(/&Chi;/g, 'Χ');
  str = str.replace(/&Psi;/g, 'Ψ');
  str = str.replace(/&Omega;/g, 'Ω');

  str = str.replace(/&alpha;/g, 'α');
  str = str.replace(/&beta;/g, 'β');
  str = str.replace(/&gamma;/g, 'γ');
  str = str.replace(/&delta;/g, 'δ');
  str = str.replace(/&epsilon;/g, 'ε');
  str = str.replace(/&zeta;/g, 'ζ');
  str = str.replace(/&eta;/g, 'η');
  str = str.replace(/&theta;/g, 'θ');
  str = str.replace(/&iota;/g, 'ι');
  str = str.replace(/&kappa;/g, 'κ');
  str = str.replace(/&lambda;/g, 'λ');
  str = str.replace(/&mu;/g, 'μ');
  str = str.replace(/&nu;/g, 'ν');
  str = str.replace(/&xi;/g, 'ξ');
  str = str.replace(/&omicron;/g, 'ο');
  str = str.replace(/&pi;/g, 'π');
  str = str.replace(/&rho;/g, 'ρ');
  str = str.replace(/&sigmaf;/g, 'ς');
  str = str.replace(/&sigma;/g, 'σ');
  str = str.replace(/&tau;/g, 'τ');
  str = str.replace(/&upsilon;/g, 'υ');
  str = str.replace(/&phi;/g, 'φ');
  str = str.replace(/&chi;/g, 'χ');
  str = str.replace(/&psi;/g, 'ψ');
  str = str.replace(/&omega;/g, 'ω');
  str = str.replace(/&thetasym;/g, 'ϑ');
  str = str.replace(/&upsih;/g, 'ϒ');
  str = str.replace(/&piv;/g, 'ϖ');
  str = str.replace(/&middot;/g, '·');
  return str;
}

function strcharacterDiscode(str) {
  // 加入常用解析
  str = str.replace(/&nbsp;/g, ' ');
  str = str.replace(/&ensp;/g, ' ');
  str = str.replace(/&emsp;/g, '　');
  str = str.replace(/&quot;/g, "'");
  str = str.replace(/&amp;/g, '&');
  str = str.replace(/&lt;/g, '<');
  str = str.replace(/&gt;/g, '>');
  str = str.replace(/&#8226;/g, '•');

  return str;
}

// HTML 支持的其他实体
function strOtherDiscode(str) {
  str = str.replace(/&OElig;/g, 'Œ');
  str = str.replace(/&oelig;/g, 'œ');
  str = str.replace(/&Scaron;/g, 'Š');
  str = str.replace(/&scaron;/g, 'š');
  str = str.replace(/&Yuml;/g, 'Ÿ');
  str = str.replace(/&fnof;/g, 'ƒ');
  str = str.replace(/&circ;/g, 'ˆ');
  str = str.replace(/&tilde;/g, '˜');
  str = str.replace(/&ensp;/g, '');
  str = str.replace(/&emsp;/g, '');
  str = str.replace(/&thinsp;/g, '');
  str = str.replace(/&zwnj;/g, '');
  str = str.replace(/&zwj;/g, '');
  str = str.replace(/&lrm;/g, '');
  str = str.replace(/&rlm;/g, '');
  str = str.replace(/&ndash;/g, '–');
  str = str.replace(/&mdash;/g, '—');
  str = str.replace(/&lsquo;/g, '‘');
  str = str.replace(/&rsquo;/g, '’');
  str = str.replace(/&sbquo;/g, '‚');
  str = str.replace(/&ldquo;/g, '“');
  str = str.replace(/&rdquo;/g, '”');
  str = str.replace(/&bdquo;/g, '„');
  str = str.replace(/&dagger;/g, '†');
  str = str.replace(/&Dagger;/g, '‡');
  str = str.replace(/&bull;/g, '•');
  str = str.replace(/&hellip;/g, '…');
  str = str.replace(/&permil;/g, '‰');
  str = str.replace(/&prime;/g, '′');
  str = str.replace(/&Prime;/g, '″');
  str = str.replace(/&lsaquo;/g, '‹');
  str = str.replace(/&rsaquo;/g, '›');
  str = str.replace(/&oline;/g, '‾');
  str = str.replace(/&euro;/g, '€');
  str = str.replace(/&trade;/g, '™');

  str = str.replace(/&larr;/g, '←');
  str = str.replace(/&uarr;/g, '↑');
  str = str.replace(/&rarr;/g, '→');
  str = str.replace(/&darr;/g, '↓');
  str = str.replace(/&harr;/g, '↔');
  str = str.replace(/&crarr;/g, '↵');
  str = str.replace(/&lceil;/g, '⌈');
  str = str.replace(/&rceil;/g, '⌉');

  str = str.replace(/&lfloor;/g, '⌊');
  str = str.replace(/&rfloor;/g, '⌋');
  str = str.replace(/&loz;/g, '◊');
  str = str.replace(/&spades;/g, '♠');
  str = str.replace(/&clubs;/g, '♣');
  str = str.replace(/&hearts;/g, '♥');

  str = str.replace(/&diams;/g, '♦');
  str = str.replace(/&#39;/g, "'");
  return str;
}

function strDiscode(str) {
  str = strNumDiscode(str);
  str = strGreeceDiscode(str);
  str = strcharacterDiscode(str);
  str = strOtherDiscode(str);
  return str;
}

function urlToHttpUrl(url, domain) {
  if (/^\/\//.test(url)) {
    return `https:${url}`;
  } else if (/^\//.test(url)) {
    return `https://${domain}${url}`;
  }
  return url;
}

export default {
  strDiscode,
  urlToHttpUrl,
};
