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using System.Collections.Generic;
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using System.Text;
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using ZeroLevel.Services.Text;
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namespace ZeroLevel.Services.Web
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{
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public static class HtmlUtility
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{
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#region Helpers
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private class SymToken
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{
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public readonly char Value;
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public readonly SymToken Preview;
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private SymToken _lazyNext = null;
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private readonly int _index;
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private readonly string _line;
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public SymToken Next
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{
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get
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{
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if (_line.Length == 0 || _index == _line.Length - 1)
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{
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return null;
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}
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else
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{
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if (_lazyNext == null)
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{
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_lazyNext = new SymToken(_line, _index + 1, this);
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}
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}
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return _lazyNext;
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}
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}
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public SymToken(string line, int index, SymToken preview)
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{
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_index = index;
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_line = line;
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if (_line.Length > _index)
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{
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Value = _line[_index];
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}
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else
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{
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Value = char.MinValue;
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}
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Preview = preview;
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}
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public bool Test(string testLine)
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{
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var cursor = this;
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for (int i = 0; i < testLine.Length; i++)
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{
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if (char.ToLowerInvariant(testLine[i]) != cursor.Value) return false;
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cursor = cursor.Next;
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}
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return true;
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}
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}
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private class StringCursor
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{
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public SymToken Token;
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public StringCursor(string line)
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{
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if (false == string.IsNullOrEmpty(line))
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{
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Token = new SymToken(line, 0, null);
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}
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else
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{
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Token = null;
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}
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}
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public char Preview
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{
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get
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{
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if (Token.Preview != null)
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{
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return Token.Preview.Value;
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}
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return char.MinValue;
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}
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}
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public char Current
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{
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get
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{
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if (Token != null)
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{
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return Token.Value;
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}
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return char.MinValue;
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}
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}
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public char Next
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{
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get
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{
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if (Token.Next != null)
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{
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return Token.Next.Value;
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}
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return char.MinValue;
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}
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}
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public bool Test(string testLine)
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{
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return Token.Test(testLine);
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}
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public void MoveAfter(string testLine)
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{
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for (int i = 0; i < testLine.Length; i++)
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{
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if (char.ToLowerInvariant(testLine[i]) == Token.Value)
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Token = Token.Next;
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}
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}
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public bool MoveNext()
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{
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if (Token != null)
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{
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Token = Token.Next;
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return true;
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}
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return false;
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}
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public bool EOF
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{
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get
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{
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return Token == null;
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}
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}
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}
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#endregion
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#region Mapping
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private readonly static Dictionary<string, string> _entityMap = new Dictionary<string, string>
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{
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{"quot;", "\""}, {"apos;", "'"}, {"amp;", "&"}, {"lt;", "<"},
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{"gt;", ">"}, {"nbsp;", ""}, {"iexcl;", "¡"}, {"cent;", "¢"},
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{"pound;", "£"}, {"curren;", "¤"}, {"yen;", "¥"}, {"brvbar;", "¦"},
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{"sect;", "§"}, {"uml;", "¨"}, {"copy;", "©"}, {"ordf;", "ª"},
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{"laquo;", "«"}, {"not;", "¬"}, {"shy;", ""}, {"reg;", "®"},
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{"macr;", "¯"}, {"deg;", "°"}, {"plusmn;", "±"}, {"sup2;", "²"},
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{"sup3;", "³"}, {"acute;", "´"}, {"micro;", "µ"}, {"para;", "¶"},
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{"middot;", "·"}, {"cedil;", "¸"}, {"sup1;", "¹"}, {"ordm;", "º"},
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{"raquo;", "»"}, {"frac14;", "¼"}, {"frac12;", "½"}, {"frac34;", "¾"},
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{"iquest;", "¿"}, {"times;", "×"}, {"divide;", "÷"}, {"Agrave;", "À"},
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{"Aacute;", "Á"}, {"Acirc;", "Â"}, {"Atilde;", "Ã"}, {"Auml;", "Ä"},
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{"Aring;", "Å"}, {"AElig;", "Æ"}, {"Ccedil;", "Ç"}, {"Egrave;", "È"},
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{"Eacute;", "É"}, {"Ecirc;", "Ê"}, {"Euml;", "Ë"}, {"Igrave;", "Ì"},
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{"Iacute;", "Í"}, {"Icirc;", "Î"}, {"Iuml;", "Ï"}, {"ETH;", "Ð"},
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{"Ntilde;", "Ñ"}, {"Ograve;", "Ò"}, {"Oacute;", "Ó"}, {"Ocirc;", "Ô"},
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{"Otilde;", "Õ"}, {"Ouml;", "Ö"}, {"Oslash;", "Ø"}, {"Ugrave;", "Ù"},
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{"Uacute;", "Ú"}, {"Ucirc;", "Û"}, {"Uuml;", "Ü"}, {"Yacute;", "Ý"},
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{"THORN;", "Þ"}, {"szlig;", "ß"}, {"agrave;", "à"}, {"aacute;", "á"},
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{"acirc;", "â"}, {"atilde;", "ã"}, {"auml;", "ä"}, {"aring;", "å"},
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{"aelig;", "æ"}, {"ccedil;", "ç"}, {"egrave;", "è"}, {"eacute;", "é"},
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{"ecirc;", "ê"}, {"euml;", "ë"}, {"igrave;", "ì"}, {"iacute;", "í"},
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{"icirc;", "î"}, {"iuml;", "ï"}, {"eth;", "ð"}, {"ntilde;", "ñ"},
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{"ograve;", "ò"}, {"oacute;", "ó"}, {"ocirc;", "ô"}, {"otilde;", "õ"},
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{"ouml;", "ö"}, {"oslash;", "ø"}, {"ugrave;", "ù"}, {"uacute;", "ú"},
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{"ucirc;", "û"}, {"uuml;", "ü"}, {"yacute;", "ý"}, {"thorn;", "þ"},
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{"yuml;", "ÿ"}
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};
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private readonly static Dictionary<string, string> _entityReverseMap = new Dictionary<string, string>
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{
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{"\"", """}, {"'", "'"}, {"&", "&"}, {"<", "<"},
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{">", ">"}, {"", " "}, {"¡", "¡"}, {"¢", "¢"},
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{"£", "£"}, {"¤", "¤"}, {"¥", "¥"}, {"¦", "¦"},
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{"§", "§"}, {"¨", "¨"}, {"©", "©"}, {"ª", "ª"},
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{"«", "«"}, {"¬", "¬"}, {"", "­"}, {"®", "®"},
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{"¯", "¯"}, {"°", "°"}, {"±", "±"}, {"²", "²"},
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{"³", "³"}, {"´", "´"}, {"µ", "µ"}, {"¶", "¶"},
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{"·", "·"}, {"¸", "¸"}, {"¹", "¹"}, {"º", "º"},
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{"»", "»"}, {"¼", "¼"}, {"½", "½"}, {"¾", "¾"},
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{"¿", "¿"}, {"×", "×"}, {"÷", "÷"}, {"À", "À"},
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{"Á", "Á"}, {"Â", "Â"}, {"Ã", "Ã"}, {"Ä", "Ä"},
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{"Å", "Å"}, {"Æ", "Æ"}, {"Ç", "Ç"}, {"È", "È"},
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{"É", "É"}, {"Ê", "Ê"}, {"Ë", "Ë"}, {"Ì", "Ì"},
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{"Í", "Í"}, {"Î", "Î"}, {"Ï", "Ï"}, {"Ð", "Ð"},
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{"Ñ", "Ñ"}, {"Ò", "Ò"}, {"Ó", "Ó"}, {"Ô", "Ô"},
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{"Õ", "Õ"}, {"Ö", "Ö"}, {"Ø", "Ø"}, {"Ù", "Ù"},
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{"Ú", "Ú"}, {"Û", "Û"}, {"Ü", "Ü"}, {"Ý", "Ý"},
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{"Þ", "Þ"}, {"ß", "ß"}, {"à", "à"}, {"á", "á"},
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{"â", "â"}, {"ã", "ã"}, {"ä", "ä"}, {"å", "å"},
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{"æ", "æ"}, {"ç", "ç"}, {"è", "è"}, {"é", "é"},
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{"ê", "ê"}, {"ë", "ë"}, {"ì", "ì"}, {"í", "í"},
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{"î", "î"}, {"ï", "ï"}, {"ð", "ð"}, {"ñ", "ñ"},
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{"ò", "ò"}, {"ó", "ó"}, {"ô", "ô"}, {"õ", "õ"},
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{"ö", "ö"}, {"ø", "ø"}, {"ù", "ù"}, {"ú", "ú"},
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{"û", "û"}, {"ü", "ü"}, {"ý", "ý"}, {"þ", "þ"},
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{"ÿ", "ÿ"}
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};
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private readonly static Dictionary<string, string> _hexMap = new Dictionary<string, string>
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{
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{"9;","\t"}, {"xa;","\n"}, {"xd;","\r"}, {"20;"," "},
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{"21;","!"}, {"22;","\""}, {"23;","#"}, {"24;","$"},
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{"25;","%"}, {"26;","&"}, {"27;","'"}, {"28;","("},
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{"29;",")"}, {"2a;","*"}, {"2b;","+"}, {"2c;",","},
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{"2d;","-"}, {"2e;","."}, {"2f;","/"}, {"3a;",":"},
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{"3b;",";"}, {"3c;","<"}, {"3d;","="}, {"3e;",">"},
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{"3f;","?"}, {"40;","@"}, {"5b;","["}, {"5c;","\\"},
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{"5d;","]"}, {"5e;","^"}, {"60;","`"}, {"7b;","{"},
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{"a0;"," "}, {"a1;","¡"}, {"a2;","¢"}, {"a3;","£"},
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{ "a4;","¤"}, {"a5;","¥"}, {"a6;","¦"}, {"a7;","§"},
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{"a9;","©"}, {"ab;","«"}, {"ae;","®"}, {"b0;","°"},
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{"b1;","±"}, {"b4;","´"}, {"b5;","µ"}, {"b6;","¶"},
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{"b7;","·"}, {"bb;","»"}, {"bc;","¼"}, {"bd;","½"},
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{"be;","¾"}, {"bf;","¿"}, {"f7;","÷"}, {"f8;","ø"}
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};
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private readonly static Dictionary<string, string> _numMap = new Dictionary<string, string>
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{
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{"9;","\t"}, {"10;","\n"}, {"13;","\r"}, {"32;"," "},
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{"33;","!"}, {"34;","\""}, {"35;","#"}, {"36;","$"},
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{"37;","%"}, {"38;","&"}, {"39;","'"}, {"40;","("},
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{"41;",")"}, {"42;","*"}, {"43;","+"}, {"44;",","},
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{"45;","-"}, {"46;","."}, {"47;","/"}, {"58;",":"},
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{"59;",";"}, {"60;","<"}, {"61;","="}, {"62;",">"},
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{"63;","?"}, {"64;","@"}, {"91;","["}, {"92;","\\"},
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{"93;","]"}, {"94;","^"}, {"96;","`"}, {"123;","{"},
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{"160;"," "}, {"161;","¡"}, {"162;","¢"}, {"163;","£"},
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{"164;","¤"}, {"165;","¥"}, {"166;","¦"}, {"167;","§"},
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{"169;","©"}, {"171;","«"}, {"174;","®"}, {"176;","°"},
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{"177;","±"}, {"180;","´"}, {"181;","µ"}, {"182;","¶"},
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{"183;","·"}, {"187;","»"}, {"188;","¼"}, {"189;","½"},
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{"190;","¾"}, {"191;","¿"}, {"247;","÷"}, {"248;","ø"}
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};
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#endregion
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public static string DecodeHtmlEntities(string line)
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{
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if (string.IsNullOrWhiteSpace(line)) return line;
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var result = new StringBuilder();
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var cursor = new StringCursor(line);
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bool found = false;
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do
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{
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found = false;
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if (cursor.EOF) break;
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switch (cursor.Current)
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{
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case '&':
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var buf = cursor.Token.Next.Next;
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switch (cursor.Next)
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{
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case '#': // HEX or DEC
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switch (buf.Value)
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{
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case 'x': // HEX
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buf = buf.Next;
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foreach (var hexPair in _hexMap)
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{
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if (buf.Test(hexPair.Key))
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{
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cursor.MoveNext();
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cursor.MoveNext();
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cursor.MoveNext();
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cursor.MoveAfter(hexPair.Key);
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result.Append(hexPair.Value);
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found = true;
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break;
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}
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}
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break;
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default: // DEC
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foreach (var decPair in _numMap)
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{
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if (buf.Test(decPair.Key))
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{
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cursor.MoveNext();
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cursor.MoveNext();
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cursor.MoveAfter(decPair.Key);
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result.Append(decPair.Value);
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found = true;
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break;
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}
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}
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break;
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}
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break;
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default: // Entity
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foreach (var pair in _entityMap)
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{
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if (cursor.Token.Next.Test(pair.Key))
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{
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cursor.MoveNext();
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cursor.MoveAfter(pair.Key);
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result.Append(pair.Value);
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found = true;
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break;
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}
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}
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break;
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}
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if (false == found)
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{
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result.Append(cursor.Current);
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}
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break;
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default:
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result.Append(cursor.Current);
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break;
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}
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} while (found || cursor.MoveNext());
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return result.ToString();
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}
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public static string EncodeHtmlEntities(string line)
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{
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if (string.IsNullOrWhiteSpace(line)) return line;
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var result = new StringBuilder();
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var cursor = new TStringReader(line);
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while (cursor.EOF == false)
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{
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if (cursor.Current == '&')
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{
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cursor.Move();
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var identity = cursor.ReadIdentity();
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cursor.MoveBack();
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if (_entityMap.ContainsKey(identity + ";"))
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{
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result.Append(cursor.Current);
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}
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else
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{
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result.Append(_entityReverseMap["&"]);
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}
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}
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else if (_entityReverseMap.ContainsKey(cursor.Current.ToString()))
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{
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result.Append(_entityReverseMap[cursor.Current.ToString()]);
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}
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else
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{
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result.Append(cursor.Current);
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}
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cursor.Move();
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}
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return result.ToString();
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}
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}
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}
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