实例介绍
【实例简介】
【实例截图】
【实例截图】
【核心代码】
namespace AngleSharp
{
using AngleSharp.Extensions;
using AngleSharp.Html;
using System;
using System.Collections.Generic;
using System.Text;
/// <summary>
/// Various HTML encoding helpers.
/// </summary>
static class TextEncoding
{
#region Fields
static readonly Dictionary<String, Encoding> encodings = new Dictionary<String, Encoding>(StringComparer.OrdinalIgnoreCase);
static readonly Dictionary<String, Encoding> suggestions = new Dictionary<String, Encoding>(StringComparer.OrdinalIgnoreCase);
#endregion
#region Encodings
/// <summary>
/// Gets the UTF-8 encoding.
/// </summary>
public static readonly Encoding Utf8 = Encoding.UTF8;
/// <summary>
/// Gets the UTF-16 (Big Endian) encoding.
/// </summary>
public static readonly Encoding Utf16Be = Encoding.BigEndianUnicode;
/// <summary>
/// Gets the UTF-16 (Little Endian) encoding.
/// </summary>
public static readonly Encoding Utf16Le = Encoding.Unicode;
/// <summary>
/// Gets the UTF-32 (Little Endian) encoding.
/// </summary>
public static readonly Encoding Utf32Le = GetEncoding("UTF-32LE");
/// <summary>
/// Gets the UTF-32 (Little Endian) encoding.
/// </summary>
public static readonly Encoding Utf32Be = GetEncoding("UTF-32BE");
/// <summary>
/// Gets the chinese government standard encoding.
/// </summary>
public static readonly Encoding Gb18030 = GetEncoding("GB18030");
/// <summary>
/// Gets the Big5 encoding.
/// </summary>
public static readonly Encoding Big5 = GetEncoding("big5");
/// <summary>
/// Gets the Windows-1252 encoding.
/// </summary>
public static readonly Encoding Windows1252 = GetEncoding("windows-1252");
#endregion
#region Initialization
static TextEncoding()
{
encodings.Add("unicode-1-1-utf-8", Utf8);
encodings.Add("utf-8", Utf8);
encodings.Add("utf8", Utf8);
encodings.Add("utf-16be", Utf16Be);
encodings.Add("utf-16", Utf16Le);
encodings.Add("utf-16le", Utf16Le);
var windows874 = GetEncoding("windows-874");
encodings.Add("dos-874", windows874);
encodings.Add("iso-8859-11", windows874);
encodings.Add("iso8859-11", windows874);
encodings.Add("iso885911", windows874);
encodings.Add("tis-620", windows874);
encodings.Add("windows-874", windows874);
var windows1250 = GetEncoding("windows-1250");
encodings.Add("cp1250", windows1250);
encodings.Add("windows-1250", windows1250);
encodings.Add("x-cp1250", windows1250);
var windows1251 = GetEncoding("windows-1251");
encodings.Add("cp1251", windows1251);
encodings.Add("windows-1251", windows1251);
encodings.Add("x-cp1251", windows1251);
encodings.Add("x-user-defined", Windows1252);
encodings.Add("ansi_x3.4-1968", Windows1252);
encodings.Add("ascii", Windows1252);
encodings.Add("cp1252", Windows1252);
encodings.Add("cp819", Windows1252);
encodings.Add("csisolatin1", Windows1252);
encodings.Add("ibm819", Windows1252);
encodings.Add("iso-8859-1", Windows1252);
encodings.Add("iso-ir-100", Windows1252);
encodings.Add("iso8859-1", Windows1252);
encodings.Add("iso88591", Windows1252);
encodings.Add("iso_8859-1", Windows1252);
encodings.Add("iso_8859-1:1987", Windows1252);
encodings.Add("l1", Windows1252);
encodings.Add("latin1", Windows1252);
encodings.Add("us-ascii", Windows1252);
encodings.Add("windows-1252", Windows1252);
encodings.Add("x-cp1252", Windows1252);
var windows1253 = GetEncoding("windows-1253");
encodings.Add("cp1253", windows1253);
encodings.Add("windows-1253", windows1253);
encodings.Add("x-cp1253", windows1253);
var windows1254 = GetEncoding("windows-1254");
encodings.Add("cp1254", windows1254);
encodings.Add("csisolatin5", windows1254);
encodings.Add("iso-8859-9", windows1254);
encodings.Add("iso-ir-148", windows1254);
encodings.Add("iso8859-9", windows1254);
encodings.Add("iso88599", windows1254);
encodings.Add("iso_8859-9", windows1254);
encodings.Add("iso_8859-9:1989", windows1254);
encodings.Add("l5", windows1254);
encodings.Add("latin5", windows1254);
encodings.Add("windows-1254", windows1254);
encodings.Add("x-cp1254", windows1254);
var windows1255 = GetEncoding("windows-1255");
encodings.Add("cp1255", windows1255);
encodings.Add("windows-1255", windows1255);
encodings.Add("x-cp1255", windows1255);
var windows1256 = GetEncoding("windows-1256");
encodings.Add("cp1256", windows1256);
encodings.Add("windows-1256", windows1256);
encodings.Add("x-cp1256", windows1256);
var windows1257 = GetEncoding("windows-1257");
encodings.Add("cp1257", windows1257);
encodings.Add("windows-1257", windows1257);
encodings.Add("x-cp1257", windows1257);
var w1258 = GetEncoding("windows-1258");
encodings.Add("cp1258", w1258);
encodings.Add("windows-1258", w1258);
encodings.Add("x-cp1258", w1258);
var macintosh = GetEncoding("macintosh");
encodings.Add("csmacintosh", macintosh);
encodings.Add("mac", macintosh);
encodings.Add("macintosh", macintosh);
encodings.Add("x-mac-roman", macintosh);
var maccyrillic = GetEncoding("x-mac-cyrillic"); ;
encodings.Add("x-mac-cyrillic", maccyrillic);
encodings.Add("x-mac-ukrainian", maccyrillic);
var i866 = GetEncoding("cp866");
encodings.Add("866", i866);
encodings.Add("cp866", i866);
encodings.Add("csibm866", i866);
encodings.Add("ibm866", i866);
var latin2 = GetEncoding("iso-8859-2");
encodings.Add("csisolatin2", latin2);
encodings.Add("iso-8859-2", latin2);
encodings.Add("iso-ir-101", latin2);
encodings.Add("iso8859-2", latin2);
encodings.Add("iso88592", latin2);
encodings.Add("iso_8859-2", latin2);
encodings.Add("iso_8859-2:1987", latin2);
encodings.Add("l2", latin2);
encodings.Add("latin2", latin2);
var latin3 = GetEncoding("iso-8859-3");
encodings.Add("csisolatin3", latin3);
encodings.Add("iso-8859-3", latin3);
encodings.Add("iso-ir-109", latin3);
encodings.Add("iso8859-3", latin3);
encodings.Add("iso88593", latin3);
encodings.Add("iso_8859-3", latin3);
encodings.Add("iso_8859-3:1988", latin3);
encodings.Add("l3", latin3);
encodings.Add("latin3", latin3);
var latin4 = GetEncoding("iso-8859-4");
encodings.Add("csisolatin4", latin4);
encodings.Add("iso-8859-4", latin4);
encodings.Add("iso-ir-110", latin4);
encodings.Add("iso8859-4", latin4);
encodings.Add("iso88594", latin4);
encodings.Add("iso_8859-4", latin4);
encodings.Add("iso_8859-4:1988", latin4);
encodings.Add("l4", latin4);
encodings.Add("latin4", latin4);
var latin5 = GetEncoding("iso-8859-5");
encodings.Add("csisolatincyrillic", latin5);
encodings.Add("cyrillic", latin5);
encodings.Add("iso-8859-5", latin5);
encodings.Add("iso-ir-144", latin5);
encodings.Add("iso8859-5", latin5);
encodings.Add("iso88595", latin5);
encodings.Add("iso_8859-5", latin5);
encodings.Add("iso_8859-5:1988", latin5);
var latin6 = GetEncoding("iso-8859-6");
encodings.Add("arabic", latin6);
encodings.Add("asmo-708", latin6);
encodings.Add("csiso88596e", latin6);
encodings.Add("csiso88596i", latin6);
encodings.Add("csisolatinarabic", latin6);
encodings.Add("ecma-114", latin6);
encodings.Add("iso-8859-6", latin6);
encodings.Add("iso-8859-6-e", latin6);
encodings.Add("iso-8859-6-i", latin6);
encodings.Add("iso-ir-127", latin6);
encodings.Add("iso8859-6", latin6);
encodings.Add("iso88596", latin6);
encodings.Add("iso_8859-6", latin6);
encodings.Add("iso_8859-6:1987", latin6);
var latin7 = GetEncoding("iso-8859-7");
encodings.Add("csisolatingreek", latin7);
encodings.Add("ecma-118", latin7);
encodings.Add("elot_928", latin7);
encodings.Add("greek", latin7);
encodings.Add("greek8", latin7);
encodings.Add("iso-8859-7", latin7);
encodings.Add("iso-ir-126", latin7);
encodings.Add("iso8859-7", latin7);
encodings.Add("iso88597", latin7);
encodings.Add("iso_8859-7", latin7);
encodings.Add("iso_8859-7:1987", latin7);
encodings.Add("sun_eu_greek", latin7);
var latin8 = GetEncoding("iso-8859-8");
encodings.Add("csiso88598e", latin8);
encodings.Add("csisolatinhebrew", latin8);
encodings.Add("hebrew", latin8);
encodings.Add("iso-8859-8", latin8);
encodings.Add("iso-8859-8-e", latin8);
encodings.Add("iso-ir-138", latin8);
encodings.Add("iso8859-8", latin8);
encodings.Add("iso88598", latin8);
encodings.Add("iso_8859-8", latin8);
encodings.Add("iso_8859-8:1988", latin8);
encodings.Add("visual", latin8);
var latini = GetEncoding("iso-8859-8-i");
encodings.Add("csiso88598i", latini);
encodings.Add("iso-8859-8-i", latini);
encodings.Add("logical", latini);
var latin13 = GetEncoding("iso-8859-13");
encodings.Add("iso-8859-13", latin13);
encodings.Add("iso8859-13", latin13);
encodings.Add("iso885913", latin13);
var latin15 = GetEncoding("iso-8859-15");
encodings.Add("csisolatin9", latin15);
encodings.Add("iso-8859-15", latin15);
encodings.Add("iso8859-15", latin15);
encodings.Add("iso885915", latin15);
encodings.Add("iso_8859-15", latin15);
encodings.Add("l9", latin15);
var kr = GetEncoding("koi8-r");
encodings.Add("cskoi8r", kr);
encodings.Add("koi", kr);
encodings.Add("koi8", kr);
encodings.Add("koi8-r", kr);
encodings.Add("koi8_r", kr);
encodings.Add("koi8-u", GetEncoding("koi8-u"));
var chinese = GetEncoding("x-cp20936");
encodings.Add("chinese", chinese);
encodings.Add("csgb2312", chinese);
encodings.Add("csiso58gb231280", chinese);
encodings.Add("gb2312", chinese);
encodings.Add("gb_2312", chinese);
encodings.Add("gb_2312-80", chinese);
encodings.Add("gbk", chinese);
encodings.Add("iso-ir-58", chinese);
encodings.Add("x-gbk", chinese);
encodings.Add("hz-gb-2312", GetEncoding("hz-gb-2312"));
encodings.Add("gb18030", Gb18030);
var big5 = GetEncoding("big5");
encodings.Add("big5", big5);
encodings.Add("big5-hkscs", big5);
encodings.Add("cn-big5", big5);
encodings.Add("csbig5", big5);
encodings.Add("x-x-big5", big5);
var isojp = GetEncoding("iso-2022-jp");
encodings.Add("csiso2022jp", isojp);
encodings.Add("iso-2022-jp", isojp);
var isokr = GetEncoding("iso-2022-kr");
encodings.Add("csiso2022kr", isokr);
encodings.Add("iso-2022-kr", isokr);
var isocn = GetEncoding("iso-2022-cn");
encodings.Add("iso-2022-cn", isocn);
encodings.Add("iso-2022-cn-ext", isocn);
encodings.Add("shift_jis", GetEncoding("shift_jis"));
var eucjp = Encoding.GetEncoding("euc-jp");
encodings.Add("euc-jp", eucjp);
suggestions.Add("ar", Utf8);
suggestions.Add("cy", Utf8);
suggestions.Add("fa", Utf8);
suggestions.Add("hr", Utf8);
suggestions.Add("kk", Utf8);
suggestions.Add("mk", Utf8);
suggestions.Add("or", Utf8);
suggestions.Add("ro", Utf8);
suggestions.Add("sr", Utf8);
suggestions.Add("vi", Utf8);
suggestions.Add("be", latin5);
suggestions.Add("bg", windows1251);
suggestions.Add("ru", windows1251);
suggestions.Add("uk", windows1251);
suggestions.Add("cs", latin2);
suggestions.Add("hu", latin2);
suggestions.Add("pl", latin2);
suggestions.Add("sl", latin2);
suggestions.Add("tr", windows1254);
suggestions.Add("ku", windows1254);
suggestions.Add("he", windows1255);
suggestions.Add("lv", GetEncoding("iso-8859-13"));
// Windows-31J ???? Replaced by something better anyway
suggestions.Add("ja", Utf8);
suggestions.Add("ko", GetEncoding("ks_c_5601-1987"));
suggestions.Add("lt", windows1257);
suggestions.Add("sk", windows1250);
suggestions.Add("th", windows874);
}
#endregion
#region Extensions
/// <summary>
/// Checks if the provided encoding is any UTF-16 encoding.
/// </summary>
/// <param name="encoding">The encoding to check.</param>
/// <returns>The result of the check (UTF-16BE, UTF-16LE).</returns>
public static Boolean IsUnicode(this Encoding encoding)
{
return encoding == Utf16Be || encoding == Utf16Le;
}
#endregion
#region Methods
/// <summary>
/// Tries to extract the encoding from the given http-equiv content string.
/// </summary>
/// <param name="content">The value of the attribute.</param>
/// <returns>The extracted encoding or null if the encoding is invalid.</returns>
public static Encoding Parse(String content)
{
var encoding = String.Empty;
var position = 0;
content = content.ToLowerInvariant();
for (int i = position; i < content.Length - 7; i )
{
if (content.Substring(i).StartsWith(AttributeNames.Charset))
{
position = i 7;
break;
}
}
if (position > 0 && position < content.Length)
{
for (int i = position; i < content.Length - 1; i )
{
if (content[i].IsSpaceCharacter())
position ;
else
break;
}
if (content[position] != Symbols.Equality)
return Parse(content.Substring(position));
position ;
for (int i = position; i < content.Length; i )
{
if (content[i].IsSpaceCharacter())
position ;
else
break;
}
if (position < content.Length)
{
if (content[position] == Symbols.DoubleQuote)
{
content = content.Substring(position 1);
var index = content.IndexOf(Symbols.DoubleQuote);
if (index != -1)
encoding = content.Substring(0, index);
}
else if (content[position] == Symbols.SingleQuote)
{
content = content.Substring(position 1);
var index = content.IndexOf(Symbols.SingleQuote);
if (index != -1)
encoding = content.Substring(0, index);
}
else
{
content = content.Substring(position);
var index = 0;
for (int i = 0; i < content.Length; i )
{
if (content[i].IsSpaceCharacter())
break;
else if (content[i] == ';')
break;
else
index ;
}
encoding = content.Substring(0, index);
}
}
}
if (!IsSupported(encoding))
return null;
return Resolve(encoding);
}
/// <summary>
/// Detects if a valid encoding has been found in the given charset string.
/// </summary>
/// <param name="charset">The parsed charset string.</param>
/// <returns>True if a valid encdoing has been found, otherwise false.</returns>
public static Boolean IsSupported(String charset)
{
return encodings.ContainsKey(charset);
}
/// <summary>
/// Resolves an Encoding instance given by the charset string.
/// If the desired encoding is not found (or supported), then
/// UTF-8 will be returned.
/// </summary>
/// <param name="charset">The charset string.</param>
/// <returns>An instance of the Encoding class or null.</returns>
public static Encoding Resolve(String charset)
{
Encoding encoding;
if (charset != null && encodings.TryGetValue(charset, out encoding))
return encoding;
return Utf8;
}
/// <summary>
/// Suggests an Encoding for the given local.
/// </summary>
/// <param name="local">The local defined by the BCP 47 language tag.</param>
/// <returns>The suggested encoding.</returns>
public static Encoding Suggest(String local)
{
if (!String.IsNullOrEmpty(local) && local.Length > 1)
{
Encoding encoding;
if (suggestions.TryGetValue(local.Substring(0, 2), out encoding))
return encoding;
else if (local.Equals("zh-cn", StringComparison.OrdinalIgnoreCase))
return Gb18030;
else if (local.Equals("zh-tw", StringComparison.OrdinalIgnoreCase))
return Big5;
}
return Windows1252;
}
/// <summary>
/// Gets the encoding for lesser used charsets. This might result in an
/// exception depending on the platform (mostly Windows Phone *).
/// Exceptions are handled by returning UTF8. That should work well in
/// most scenarios.
/// </summary>
/// <param name="name">The name of the charset.</param>
/// <returns>The encoding for the given charset.</returns>
static Encoding GetEncoding(String name)
{
try
{
return Encoding.GetEncoding(name);
}
catch
{
// We use a catch em all since WP8 does throw a different exception than W*.
return Utf8;
}
}
#endregion
#region Punycode
const Int32 PunycodeBase = 36;
const Int32 tmin = 1;
const Int32 tmax = 26;
static readonly String AcePrefix = "xn--";
static readonly Char[] PossibleDots = { '.', '\u3002', '\uFF0E', '\uFF61' };
static Boolean IsSupplementary(Int32 test)
{
return test >= 0x10000;
}
static Boolean IsDot(Char c)
{
return PossibleDots.Contains(c);
}
static Char EncodeDigit(Int32 d)
{
// 26-35 map to ASCII 0-9
if (d > 25)
return (Char)(d - 26 '0');
// 0-25 map to a-z or A-Z
return (Char)(d 'a');
}
static Char EncodeBasic(Char bcp)
{
if (Char.IsUpper(bcp))
bcp = (Char)('a' - 'A');
return bcp;
}
static Int32 AdaptChar(Int32 delta, Int32 numpoints, Boolean firsttime)
{
const Int32 Skew = 38;
const Int32 Damp = 700;
var k = 0u;
delta = firsttime ? delta / Damp : delta / 2;
delta = delta / numpoints;
for (k = 0; delta > ((PunycodeBase - tmin) * tmax) / 2; k = PunycodeBase)
delta /= PunycodeBase - tmin;
return (Int32)(k (PunycodeBase - tmin 1) * delta / (delta Skew));
}
public static String PunycodeEncode(String unicode)
{
const Int32 InitialBias = 72;
const Int32 InitialNumber = 0x80;
const Int32 MaxIntValue = 0x7ffffff;
const Int32 LabelLimit = 63;
const Int32 DefaultNameLimit = 255;
// 0 length strings aren't allowed
if (unicode.Length == 0)
return unicode;
var output = new StringBuilder(unicode.Length);
var iNextDot = 0;
var iAfterLastDot = 0;
var iOutputAfterLastDot = 0;
// Find the next dot
while (iNextDot < unicode.Length)
{
// Find end of this segment
iNextDot = unicode.IndexOfAny(PossibleDots, iAfterLastDot);
if (iNextDot < 0)
iNextDot = unicode.Length;
// Only allowed to have empty . section at end (www.microsoft.com.)
if (iNextDot == iAfterLastDot)
break;
// We'll need an Ace prefix
output.Append(AcePrefix);
var basicCount = 0;
var numProcessed = 0;
for (basicCount = iAfterLastDot; basicCount < iNextDot; basicCount )
{
if (unicode[basicCount] < 0x80)
{
output.Append(EncodeBasic(unicode[basicCount]));
numProcessed ;
}
else if (Char.IsSurrogatePair(unicode, basicCount))
basicCount ;
}
var numBasicCodePoints = numProcessed;
if (numBasicCodePoints == iNextDot - iAfterLastDot)
{
output.Remove(iOutputAfterLastDot, AcePrefix.Length);
}
else
{
// If it has some non-basic code points the input cannot start with xn--
if (unicode.Length - iAfterLastDot >= AcePrefix.Length && unicode.Substring(iAfterLastDot, AcePrefix.Length).Equals(AcePrefix, StringComparison.OrdinalIgnoreCase))
break;
// Need to do ACE encoding
var numSurrogatePairs = 0;
// Add a delimiter (-) if we had any basic code points (between basic and encoded pieces)
if (numBasicCodePoints > 0)
output.Append('-');
// Initialize the state
var n = InitialNumber;
var delta = 0;
var bias = InitialBias;
// Main loop
while (numProcessed < (iNextDot - iAfterLastDot))
{
var j = 0;
var m = 0;
var test = 0;
for (m = MaxIntValue, j = iAfterLastDot; j < iNextDot; j = IsSupplementary(test) ? 2 : 1)
{
test = unicode.ConvertToUtf32(j);
if (test >= n && test < m)
m = test;
}
/* Increase delta enough to advance the decoder's */
/* <n,i> state to <m,0>, but guard against overflow: */
delta = (m - n) * ((numProcessed - numSurrogatePairs) 1);
n = m;
for (j = iAfterLastDot; j < iNextDot; j = IsSupplementary(test) ? 2 : 1)
{
// Make sure we're aware of surrogates
test = unicode.ConvertToUtf32(j);
// Adjust for character position (only the chars in our string already, some
// haven't been processed.
if (test < n)
delta ;
if (test == n)
{
// Represent delta as a generalized variable-length integer:
int q, k;
for (q = delta, k = PunycodeBase; ; k = PunycodeBase)
{
int t = k <= bias ? tmin : k >= bias tmax ? tmax : k - bias;
if (q < t)
break;
output.Append(EncodeDigit(t (q - t) % (PunycodeBase - t)));
q = (q - t) / (PunycodeBase - t);
}
output.Append(EncodeDigit(q));
bias = AdaptChar(delta, (numProcessed - numSurrogatePairs) 1, numProcessed == numBasicCodePoints);
delta = 0;
numProcessed ;
if (IsSupplementary(m))
{
numProcessed ;
numSurrogatePairs ;
}
}
}
delta;
n;
}
}
// Make sure its not too big
if (output.Length - iOutputAfterLastDot > LabelLimit)
throw new ArgumentException();
// Done with this segment, add dot if necessary
if (iNextDot != unicode.Length)
output.Append(PossibleDots[0]);
iAfterLastDot = iNextDot 1;
iOutputAfterLastDot = output.Length;
}
var rest = IsDot(unicode[unicode.Length - 1]) ? 0 : 1;
var maxlength = DefaultNameLimit - rest;
// Throw if we're too long
if (output.Length > maxlength)
output.Remove(maxlength, output.Length - maxlength);
return output.ToString();
}
#endregion
}
}
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