/// <summary>
/// See 8.2.4.69 Tokenizing character references
/// </summary>
/// <param name="c">The next input character.</param>
/// <param name="allowedCharacter">The additionally allowed character if there is one.</param>
String CharacterReference(Char c, Char allowedCharacter = Specification.NULL)
{
if (c.IsSpaceCharacter() || c == Specification.LT || c == Specification.EOF || c == Specification.AMPERSAND || c == allowedCharacter)
{
_src.Back();
return null;
}
if (c == Specification.NUM)
{
var exp = 10;
var basis = 1;
var num = 0;
var nums = new List<Int32>();
c = _src.Next;
var isHex = c == 'x' || c == 'X';
if (isHex)
{
exp = 16;
while ((c = _src.Next).IsHex())
nums.Add(c.FromHex());
}
else
{
while (c.IsDigit())
{
nums.Add(c.FromHex());
c = _src.Next;
}
}
for (var i = nums.Count - 1; i >= 0; i--)
{
num += nums[i] * basis;
basis *= exp;
}
if (nums.Count == 0)
{
_src.Back(2);
if (isHex)
_src.Back();
RaiseErrorOccurred(ErrorCode.CharacterReferenceWrongNumber);
return null;
}
if (c != Specification.SC)
{
RaiseErrorOccurred(ErrorCode.CharacterReferenceSemicolonMissing);
_src.Back();
}
if (Entities.IsInCharacterTable(num))
{
RaiseErrorOccurred(ErrorCode.CharacterReferenceInvalidCode);
return Entities.GetSymbolFromTable(num);
}
if (Entities.IsInvalidNumber(num))
{
RaiseErrorOccurred(ErrorCode.CharacterReferenceInvalidNumber);
return Specification.REPLACEMENT.ToString();
}
if (Entities.IsInInvalidRange(num))
RaiseErrorOccurred(ErrorCode.CharacterReferenceInvalidRange);
return Entities.Convert(num);
}
else
{
var last = String.Empty;
var consumed = 0;
var start = _src.InsertionPoint - 1;
var reference = new Char[31];
var index = 0;
var chr = _src.Current;
do
{
if (chr == Specification.SC || !chr.IsName())
break;
reference[index++] = chr;
var value = new String(reference, 0, index);
chr = _src.Next;
consumed++;
value = chr == Specification.SC ? Entities.GetSymbol(value) : Entities.GetSymbolWithoutSemicolon(value);
if (value != null)
{
consumed = 0;
last = value;
}
}
while (!_src.IsEnded);
_src.Back(consumed);
chr = _src.Current;
if (chr != Specification.SC)
{
if (allowedCharacter != Specification.NULL && (chr == Specification.EQ || chr.IsAlphanumericAscii()))
{
if (chr == Specification.EQ)
RaiseErrorOccurred(ErrorCode.CharacterReferenceAttributeEqualsFound);
_src.InsertionPoint = start;
return null;
}
_src.Back();
RaiseErrorOccurred(ErrorCode.CharacterReferenceNotTerminated);
}
return last;
}
}
/// <summary>
/// See 8.2.4.69 Tokenizing character references
/// </summary>
/// <param name="c">The next input character.</param>
/// <param name="allowedCharacter">The additionally allowed character if there is one.</param>
void AppendCharacterReference(Char c, Char allowedCharacter = Symbols.Null)
{
if (c.IsSpaceCharacter() || c == Symbols.LessThan || c == Symbols.EndOfFile || c == Symbols.Ampersand || c == allowedCharacter)
{
Back();
_stringBuffer.Append(Symbols.Ampersand);
return;
}
var entity = default(String);
if (c == Symbols.Num)
{
var exp = 10;
var basis = 1;
var num = 0;
var nums = new List<Int32>();
c = GetNext();
var isHex = c == 'x' || c == 'X';
if (isHex)
{
exp = 16;
while ((c = GetNext()).IsHex())
nums.Add(c.FromHex());
}
else
{
while (c.IsDigit())
{
nums.Add(c.FromHex());
c = GetNext();
}
}
for (var i = nums.Count - 1; i >= 0; i--)
{
num += nums[i] * basis;
basis *= exp;
}
if (nums.Count == 0)
{
Back(2);
if (isHex)
Back();
RaiseErrorOccurred(HtmlParseError.CharacterReferenceWrongNumber);
_stringBuffer.Append(Symbols.Ampersand);
return;
}
if (c != Symbols.Semicolon)
{
RaiseErrorOccurred(HtmlParseError.CharacterReferenceSemicolonMissing);
Back();
}
if (Entities.IsInCharacterTable(num))
{
RaiseErrorOccurred(HtmlParseError.CharacterReferenceInvalidCode);
entity = Entities.GetSymbolFromTable(num);
}
else if (Entities.IsInvalidNumber(num))
{
RaiseErrorOccurred(HtmlParseError.CharacterReferenceInvalidNumber);
entity = Symbols.Replacement.ToString();
}
else
{
if (Entities.IsInInvalidRange(num))
RaiseErrorOccurred(HtmlParseError.CharacterReferenceInvalidRange);
entity = Entities.Convert(num);
}
}
else
{
var consumed = 0;
var start = InsertionPoint - 1;
var reference = new Char[31];
var index = 0;
var chr = Current;
do
{
if (chr == Symbols.Semicolon || !chr.IsName())
break;
reference[index++] = chr;
var value = new String(reference, 0, index);
chr = GetNext();
consumed++;
value = chr == Symbols.Semicolon ? Entities.GetSymbol(value) : Entities.GetSymbolWithoutSemicolon(value);
if (value != null)
{
consumed = 0;
entity = value;
}
}
while (chr != Symbols.EndOfFile && index < 31);
Back(consumed);
chr = Current;
if (chr != Symbols.Semicolon)
{
if (allowedCharacter != Symbols.Null && (chr == Symbols.Equality || chr.IsAlphanumericAscii()))
{
if (chr == Symbols.Equality)
RaiseErrorOccurred(HtmlParseError.CharacterReferenceAttributeEqualsFound);
InsertionPoint = start;
_stringBuffer.Append(Symbols.Ampersand);
return;
}
Back();
RaiseErrorOccurred(HtmlParseError.CharacterReferenceNotTerminated);
}
if (entity == null)
{
_stringBuffer.Append(Symbols.Ampersand);
return;
}
}
_stringBuffer.Append(entity);
}
private String GetNumericCharacterReference(Char c)
{
var exp = 10;
var basis = 1;
var num = 0;
var nums = new List<Int32>();
var isHex = c == 'x' || c == 'X';
if (isHex)
{
exp = 16;
while ((c = GetNext()).IsHex())
{
nums.Add(c.FromHex());
}
}
else
{
while (c.IsDigit())
{
nums.Add(c.FromHex());
c = GetNext();
}
}
for (var i = nums.Count - 1; i >= 0; i--)
{
num += nums[i] * basis;
basis *= exp;
}
if (nums.Count == 0)
{
Back(2);
if (isHex)
{
Back();
}
RaiseErrorOccurred(HtmlParseError.CharacterReferenceWrongNumber);
return null;
}
if (c != Symbols.Semicolon)
{
RaiseErrorOccurred(HtmlParseError.CharacterReferenceSemicolonMissing);
Back();
}
if (HtmlEntityService.IsInCharacterTable(num))
{
RaiseErrorOccurred(HtmlParseError.CharacterReferenceInvalidCode);
return HtmlEntityService.GetSymbolFromTable(num);
}
else if (HtmlEntityService.IsInvalidNumber(num))
{
RaiseErrorOccurred(HtmlParseError.CharacterReferenceInvalidNumber);
return Symbols.Replacement.ToString();
}
else if (HtmlEntityService.IsInInvalidRange(num))
{
RaiseErrorOccurred(HtmlParseError.CharacterReferenceInvalidRange);
}
return num.ConvertFromUtf32();
}