/// <summary>
/// Applies the token to the currently build value.
/// </summary>
/// <param name="token">The current token to apply.</param>
public void Apply(CssToken token)
{
switch (token.Type)
{
case CssTokenType.RoundBracketOpen:
_open++;
Add(token);
break;
case CssTokenType.Function: // e.g. "rgba(...)"
Add(token);
break;
case CssTokenType.Ident: // e.g. "auto"
_important = CheckImportant(token);
break;
case CssTokenType.RoundBracketClose:
_open--;
Add(token);
break;
case CssTokenType.Whitespace: // e.g. " "
if (_values.Count > 0 && IsSlash(_values[_values.Count - 1]) == false)
_buffer = token;
break;
case CssTokenType.Dimension: // e.g. "3px"
case CssTokenType.Percentage: // e.g. "5%"
case CssTokenType.Color:// e.g. "#ABCDEF"
case CssTokenType.Delim:// e.g. "#"
case CssTokenType.String:// e.g. "'i am a string'"
case CssTokenType.Url:// e.g. "url('this is a valid URL')"
case CssTokenType.Number: // e.g. "173"
case CssTokenType.Comma: // e.g. ","
Add(token);
break;
case CssTokenType.Comment:
// Should not be considered.
break;
default: // everything else is unexpected
_valid = false;
Add(token);
break;
}
}
/// <summary>
/// Called before the property name has been detected.
/// </summary>
public CssProperty CreateDeclarationWith(Func<String, CssProperty> createProperty, ref CssToken token)
{
var property = default(CssProperty);
if (token.Type == CssTokenType.Ident)
{
var propertyName = token.Data;
token = _tokenizer.Get();
if (token.Type != CssTokenType.Colon)
{
RaiseErrorOccurred(CssParseError.ColonMissing, token);
}
else
{
property = _parser.Options.IsIncludingUnknownDeclarations || _parser.Options.IsToleratingInvalidValues ?
new CssUnknownProperty(propertyName) : createProperty(propertyName);
if (property == null)
RaiseErrorOccurred(CssParseError.UnknownDeclarationName, token);
var important = false;
var val = CreateValue(ref token, out important);
if (val == null)
RaiseErrorOccurred(CssParseError.ValueMissing, token);
else if (property != null && property.TrySetValue(val))
property.IsImportant = important;
}
_tokenizer.JumpToEndOfDeclaration();
token = _tokenizer.Get();
}
else if (token.Type != CssTokenType.Eof)
{
RaiseErrorOccurred(CssParseError.IdentExpected, token);
_tokenizer.JumpToEndOfDeclaration();
token = _tokenizer.Get();
}
if (token.Type == CssTokenType.Semicolon)
token = _tokenizer.Get();
return property;
}
void Add(CssToken token)
{
if (_buffer != null && !IsCommaOrSlash(token))
{
_values.Add(_buffer);
}
else if (_values.Count != 0 && !IsComma(token) && IsComma(_values[_values.Count - 1]))
{
_values.Add(CssToken.Whitespace);
}
_buffer = null;
if (_important)
{
_valid = false;
}
_values.Add(token);
}
/// <summary>
/// Resets the builder for reprocessing.
/// </summary>
public CssValueBuilder Reset()
{
_open = 0;
_valid = true;
_buffer = null;
_important = false;
_values.Clear();
return this;
}
static Boolean IsExclamationMark(CssToken token)
{
return(token.Type == CssTokenType.Delim && token.Data.Has(Symbols.ExclamationMark));
}
static Boolean IsCommaOrSlash(CssToken token)
{
return(IsComma(token) || IsSlash(token));
}
public Boolean Finished(CssToken token)
{
return(OnToken(token));
}
/// <summary>
/// Checks if the provided token is neither of the first nor the second
/// type of token.
/// </summary>
/// <param name="token">The token to examine.</param>
/// <param name="a">The first type to unmatch.</param>
/// <param name="b">The alternative unmatch for the token.</param>
/// <returns>Result of the examination.</returns>
public static Boolean IsNot(this CssToken token, CssTokenType a, CssTokenType b)
{
var type = token.Type;
return(type != a && type != b);
}
private CssRule SkipDeclarations(CssToken token)
{
RaiseErrorOccurred(CssParseError.InvalidToken, token.Position);
JumpToRuleEnd(ref token);
return(default(CssRule));
}
/// <summary>
/// Scans the current medium for the @media or @import rule.
/// </summary>
public CssMedium CreateMedium(ref CssToken token)
{
var medium = new CssMedium();
CollectTrivia(ref token);
if (token.Type == CssTokenType.Ident)
{
var identifier = token.Data;
if (identifier.Isi(Keywords.Not))
{
medium.IsInverse = true;
token = NextToken();
CollectTrivia(ref token);
}
else if (identifier.Isi(Keywords.Only))
{
medium.IsExclusive = true;
token = NextToken();
CollectTrivia(ref token);
}
}
if (token.Type == CssTokenType.Ident)
{
medium.Type = token.Data;
token = NextToken();
CollectTrivia(ref token);
if (token.Type != CssTokenType.Ident || !token.Data.Isi(Keywords.And))
{
return(medium);
}
token = NextToken();
CollectTrivia(ref token);
}
do
{
if (token.Type != CssTokenType.RoundBracketOpen)
{
return(null);
}
token = NextToken();
CollectTrivia(ref token);
var feature = CreateFeature(ref token);
if (feature != null)
{
medium.AppendChild(feature);
}
if (token.Type != CssTokenType.RoundBracketClose)
{
return(null);
}
token = NextToken();
CollectTrivia(ref token);
if (feature == null)
{
return(null);
}
if (token.Type != CssTokenType.Ident || !token.Data.Isi(Keywords.And))
{
break;
}
token = NextToken();
CollectTrivia(ref token);
}while (token.Type != CssTokenType.EndOfFile);
return(medium);
}
/// <summary>
/// Called before the property name has been detected.
/// </summary>
public CssProperty CreateDeclaration(ref CssToken token)
{
CollectTrivia(ref token);
return(CreateDeclarationWith(Factory.Properties.Create, ref token));
}
/// <summary>
/// Called before the property name has been detected.
/// </summary>
public CssProperty CreateDeclarationWith(Func <String, CssProperty> createProperty, ref CssToken token)
{
var property = default(CssProperty);
var sb = Pool.NewStringBuilder();
var start = token.Position;
while (token.IsDeclarationName())
{
sb.Append(token.ToValue());
token = NextToken();
}
var propertyName = sb.ToPool();
if (propertyName.Length > 0)
{
property = _parser.Options.IsIncludingUnknownDeclarations ||
_parser.Options.IsToleratingInvalidValues ?
new CssUnknownProperty(propertyName) : createProperty(propertyName);
if (property == null)
{
RaiseErrorOccurred(CssParseError.UnknownDeclarationName, start);
}
else
{
_nodes.Push(property);
}
CollectTrivia(ref token);
if (token.Type == CssTokenType.Colon)
{
var important = false;
var value = CreateValue(CssTokenType.CurlyBracketClose, ref token, out important);
if (value == null)
{
RaiseErrorOccurred(CssParseError.ValueMissing, token.Position);
}
else if (property != null && property.TrySetValue(value))
{
property.IsImportant = important;
}
CollectTrivia(ref token);
}
else
{
RaiseErrorOccurred(CssParseError.ColonMissing, token.Position);
}
JumpToDeclEnd(ref token);
if (property != null)
{
_nodes.Pop();
}
}
else if (token.Type != CssTokenType.EndOfFile)
{
RaiseErrorOccurred(CssParseError.IdentExpected, start);
JumpToDeclEnd(ref token);
}
if (token.Type == CssTokenType.Semicolon)
{
token = NextToken();
}
return(property);
}
/// <summary>
/// Called before any token in the value regime had been seen.
/// </summary>
public IConditionFunction CreateCondition(ref CssToken token)
{
CollectTrivia(ref token);
return(AggregateCondition(ref token));
}
/// <summary>
/// Creates a single value. Does not care about the !important flag.
/// </summary>
public CssValue CreateValue(ref CssToken token)
{
var important = false;
return(CreateValue(CssTokenType.CurlyBracketClose, ref token, out important));
}
/// <summary>
/// 4.4.23. Unicode-range State
/// </summary>
CssToken UnicodeRange(Char current)
{
for (int i = 0; i < 6; i++)
{
if (!current.IsHex())
{
break;
}
_stringBuffer.Append(current);
current = Next;
}
if (_stringBuffer.Length != 6)
{
for (int i = 0; i < 6 - _stringBuffer.Length; i++)
{
if (current != Specification.QuestionMark)
{
current = Previous;
break;
}
_stringBuffer.Append(current);
current = Next;
}
var range = FlushBuffer();
var start = range.Replace(Specification.QuestionMark, '0');
var end = range.Replace(Specification.QuestionMark, 'F');
return(CssToken.Range(start, end));
}
else if (current == Specification.Minus)
{
current = Next;
if (current.IsHex())
{
var start = _stringBuffer.ToString();
_stringBuffer.Clear();
for (int i = 0; i < 6; i++)
{
if (!current.IsHex())
{
current = Previous;
break;
}
_stringBuffer.Append(current);
current = Next;
}
var end = FlushBuffer();
return(CssToken.Range(start, end));
}
else
{
Back(2);
return(CssToken.Range(FlushBuffer(), null));
}
}
else
{
Back();
return(CssToken.Range(FlushBuffer(), null));
}
}
static Boolean IsComma(CssToken token)
{
return token.Type == CssTokenType.Comma;
}
static Boolean IsSlash(CssToken token)
{
return token.Type == CssTokenType.Delim && token.Data.Has(Symbols.Solidus);
}
private List <IConditionFunction> MultipleConditions(IConditionFunction condition, String connector, ref CssToken token)
{
var list = new List <IConditionFunction>();
CollectTrivia(ref token);
list.Add(condition);
while (token.Type != CssTokenType.EndOfFile)
{
condition = ExtractCondition(ref token);
if (condition == null)
{
break;
}
list.Add(condition);
if (!token.Data.Isi(connector))
{
break;
}
token = NextToken();
CollectTrivia(ref token);
}
return(list);
}
/// <summary>
/// Tries to read and set media constraints for the provided medium.
/// </summary>
Boolean TrySetConstraint(CssMedium medium, ref CssToken token)
{
if (token.Type != CssTokenType.Ident)
{
_tokenizer.JumpToClosedArguments();
token = _tokenizer.Get();
return false;
}
var value = Pool.NewValueBuilder();
var featureName = token.Data;
token = _tokenizer.Get();
if (token.Type == CssTokenType.Colon)
{
_tokenizer.State = CssParseMode.Value;
token = _tokenizer.Get();
while (token.Type != CssTokenType.RoundBracketClose || value.IsReady == false)
{
if (token.Type == CssTokenType.Eof)
break;
value.Apply(token);
token = _tokenizer.Get();
}
_tokenizer.State = CssParseMode.Data;
var val = value.ToPool();
var feature = _parser.Options.IsToleratingInvalidConstraints ?
new UnknownMediaFeature(featureName) : Factory.MediaFeatures.Create(featureName);
if (feature == null || !feature.TrySetValue(val))
return false;
medium.AddConstraint(feature);
return true;
}
return token.Type != CssTokenType.Eof;
}
/// <summary>
/// Called before the property name has been detected.
/// </summary>
public CssProperty CreateDeclaration(ref CssToken token)
{
return CreateDeclarationWith(Factory.Properties.Create, ref token);
}
/// <summary>
/// 4.4.1. Data state
/// </summary>
CssToken Data(Char current)
{
switch (current)
{
case Symbols.LineFeed:
case Symbols.CarriageReturn:
case Symbols.Tab:
case Symbols.Space:
do
{
current = GetNext();
}while (current.IsSpaceCharacter());
if (_ignoreWs)
{
return(Data(current));
}
Back();
return(CssSpecialCharacter.Whitespace);
case Symbols.DoubleQuote:
return(StringDQ());
case Symbols.Num:
return(HashStart());
case Symbols.Dollar:
current = GetNext();
if (current == Symbols.Equality)
{
return(CssMatchToken.Suffix);
}
return(CssToken.Delim(GetPrevious()));
case Symbols.SingleQuote:
return(StringSQ());
case Symbols.RoundBracketOpen:
return(CssBracketToken.OpenRound);
case Symbols.RoundBracketClose:
return(CssBracketToken.CloseRound);
case Symbols.Asterisk:
current = GetNext();
if (current == Symbols.Equality)
{
return(CssMatchToken.Substring);
}
return(CssToken.Delim(GetPrevious()));
case Symbols.Plus:
{
var c1 = GetNext();
if (c1 != Symbols.EndOfFile)
{
var c2 = GetNext();
Back(2);
if (c1.IsDigit() || (c1 == Symbols.Dot && c2.IsDigit()))
{
return(NumberStart(current));
}
}
else
{
Back();
}
return(CssToken.Delim(current));
}
case Symbols.Comma:
return(CssSpecialCharacter.Comma);
case Symbols.Dot:
{
var c = GetNext();
if (c.IsDigit())
{
return(NumberStart(GetPrevious()));
}
return(CssToken.Delim(GetPrevious()));
}
case Symbols.Minus:
{
var c1 = GetNext();
if (c1 != Symbols.EndOfFile)
{
var c2 = GetNext();
Back(2);
if (c1.IsDigit() || (c1 == Symbols.Dot && c2.IsDigit()))
{
return(NumberStart(current));
}
else if (c1.IsNameStart())
{
return(IdentStart(current));
}
else if (c1 == Symbols.ReverseSolidus && !c2.IsLineBreak() && c2 != Symbols.EndOfFile)
{
return(IdentStart(current));
}
else if (c1 == Symbols.Minus && c2 == Symbols.GreaterThan)
{
Advance(2);
if (_ignoreCs)
{
return(Data(GetNext()));
}
return(CssCommentToken.Close);
}
}
else
{
Back();
}
return(CssToken.Delim(current));
}
case Symbols.Solidus:
current = GetNext();
if (current == Symbols.Asterisk)
{
return(Comment());
}
return(CssToken.Delim(GetPrevious()));
case Symbols.ReverseSolidus:
current = GetNext();
if (current.IsLineBreak() || current == Symbols.EndOfFile)
{
RaiseErrorOccurred(current == Symbols.EndOfFile ? ErrorCode.EOF : ErrorCode.LineBreakUnexpected);
return(CssToken.Delim(GetPrevious()));
}
return(IdentStart(GetPrevious()));
case Symbols.Colon:
return(CssSpecialCharacter.Colon);
case Symbols.Semicolon:
return(CssSpecialCharacter.Semicolon);
case Symbols.LessThan:
current = GetNext();
if (current == Symbols.ExclamationMark)
{
current = GetNext();
if (current == Symbols.Minus)
{
current = GetNext();
if (current == Symbols.Minus)
{
if (_ignoreCs)
{
return(Data(GetNext()));
}
return(CssCommentToken.Open);
}
current = GetPrevious();
}
current = GetPrevious();
}
return(CssToken.Delim(GetPrevious()));
case Symbols.At:
return(AtKeywordStart());
case Symbols.SquareBracketOpen:
return(CssBracketToken.OpenSquare);
case Symbols.SquareBracketClose:
return(CssBracketToken.CloseSquare);
case Symbols.Accent:
current = GetNext();
if (current == Symbols.Equality)
{
return(CssMatchToken.Prefix);
}
return(CssToken.Delim(GetPrevious()));
case Symbols.CurlyBracketOpen:
return(CssBracketToken.OpenCurly);
case Symbols.CurlyBracketClose:
return(CssBracketToken.CloseCurly);
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return(NumberStart(current));
case 'U':
case 'u':
current = GetNext();
if (current == Symbols.Plus)
{
current = GetNext();
if (current.IsHex() || current == Symbols.QuestionMark)
{
return(UnicodeRange(current));
}
current = GetPrevious();
}
return(IdentStart(GetPrevious()));
case Symbols.Pipe:
current = GetNext();
if (current == Symbols.Equality)
{
return(CssMatchToken.Dash);
}
else if (current == Symbols.Pipe)
{
return(CssColumnToken.Instance);
}
return(CssToken.Delim(GetPrevious()));
case Symbols.Tilde:
current = GetNext();
if (current == Symbols.Equality)
{
return(CssMatchToken.Include);
}
return(CssToken.Delim(GetPrevious()));
case Symbols.EndOfFile:
return(null);
case Symbols.ExclamationMark:
current = GetNext();
if (current == Symbols.Equality)
{
return(CssMatchToken.Not);
}
return(CssToken.Delim(GetPrevious()));
default:
if (current.IsNameStart())
{
return(IdentStart(current));
}
return(CssToken.Delim(current));
}
}
/// <summary>
/// Scans the current medium for the @media or @import rule.
/// </summary>
public CssMedium CreateMedium(ref CssToken token)
{
var medium = new CssMedium();
if (token.Type == CssTokenType.Ident)
{
var identifier = token.Data;
if (identifier.Equals(Keywords.Not, StringComparison.OrdinalIgnoreCase))
{
medium.IsInverse = true;
token = _tokenizer.Get();
}
else if (identifier.Equals(Keywords.Only, StringComparison.OrdinalIgnoreCase))
{
medium.IsExclusive = true;
token = _tokenizer.Get();
}
}
if (token.Type == CssTokenType.Ident)
{
medium.Type = token.Data;
token = _tokenizer.Get();
if (token.Type != CssTokenType.Ident || String.Compare(token.Data, Keywords.And, StringComparison.OrdinalIgnoreCase) != 0)
return medium;
token = _tokenizer.Get();
}
do
{
if (token.Type != CssTokenType.RoundBracketOpen)
return null;
token = _tokenizer.Get();
var couldSetConstraint = TrySetConstraint(medium, ref token);
if (token.Type != CssTokenType.RoundBracketClose)
return null;
token = _tokenizer.Get();
if (couldSetConstraint == false)
return null;
if (token.Type != CssTokenType.Ident || String.Compare(token.Data, Keywords.And, StringComparison.OrdinalIgnoreCase) != 0)
break;
token = _tokenizer.Get();
}
while (token.Type != CssTokenType.Eof);
return medium;
}
protected abstract Boolean OnToken(CssToken token);
/// <summary>
/// Skips the current declaration.
/// </summary>
protected CssRule SkipDeclarations(CssToken token)
{
RaiseErrorOccurred(CssParseError.InvalidToken, token);
_tokenizer.SkipUnknownRule();
return null;
}
static Boolean IsComma(CssToken token)
{
return(token.Type == CssTokenType.Comma);
}
/// <summary>
/// State that is called once we are in a CSS selector.
/// </summary>
protected ISelector CreateSelector(ref CssToken token)
{
var selector = Pool.NewSelectorConstructor();
_tokenizer.State = CssParseMode.Selector;
var start = token;
while (token.IsNot(CssTokenType.Eof, CssTokenType.CurlyBracketOpen, CssTokenType.CurlyBracketClose))
{
selector.Apply(token);
token = _tokenizer.Get();
}
if (selector.IsValid == false)
RaiseErrorOccurred(CssParseError.InvalidSelector, start);
_tokenizer.State = CssParseMode.Data;
return selector.ToPool();
}
static Boolean IsSlash(CssToken token)
{
return(token.Type == CssTokenType.Delim && token.Data.Has(Symbols.Solidus));
}
/// <summary>
/// Called before any token in the value regime had been seen.
/// </summary>
protected CssValue CreateValue(ref CssToken token, out Boolean important)
{
var value = Pool.NewValueBuilder();
_tokenizer.State = CssParseMode.Value;
token = _tokenizer.Get();
while (token.Type != CssTokenType.Eof)
{
if (token.Is(CssTokenType.Semicolon, CssTokenType.CurlyBracketClose) ||
(token.Type == CssTokenType.RoundBracketClose && value.IsReady))
break;
value.Apply(token);
token = _tokenizer.Get();
}
important = value.IsImportant;
_tokenizer.State = CssParseMode.Data;
return value.ToPool();
}
Boolean CheckImportant(CssToken token)
{
if (_values.Count != 0 && token.Data == Keywords.Important)
{
var previous = _values[_values.Count - 1];
if (IsExclamationMark(previous))
{
do _values.RemoveAt(_values.Count - 1);
while (_values.Count > 0 && _values[_values.Count - 1].Type == CssTokenType.Whitespace);
return true;
}
}
Add(token);
return _important;
}
/// <summary>
/// Before the name of a rule has been detected.
/// </summary>
protected String GetRuleName(ref CssToken token)
{
var name = String.Empty;
if (token.Type == CssTokenType.Ident)
{
name = token.Data;
token = _tokenizer.Get();
}
return name;
}
static Boolean IsCommaOrSlash(CssToken token)
{
return IsComma(token) || IsSlash(token);
}
/// <summary>
/// Before any medium has been found for the @media or @import rule.
/// </summary>
protected void FillMediaList(MediaList list, ref CssToken token)
{
if (token.Type != CssTokenType.CurlyBracketOpen)
{
while (token.Type != CssTokenType.Eof)
{
var medium = CreateMedium(ref token);
if (medium != null)
list.Add(medium);
if (token.Type != CssTokenType.Comma)
break;
token = _tokenizer.Get();
}
if (token.Type != CssTokenType.CurlyBracketOpen)
{
do
{
if (token.Type == CssTokenType.Eof || token.Type == CssTokenType.Semicolon)
break;
token = _tokenizer.Get();
}
while (token.Type != CssTokenType.CurlyBracketOpen);
list.Clear();
}
if (list.Length == 0)
{
list.Add(new CssMedium
{
IsInverse = true,
Type = Keywords.All
});
}
}
}
static Boolean IsExclamationMark(CssToken token)
{
return token.Type == CssTokenType.Delim && token.Data.Has(Symbols.ExclamationMark);
}
/// <summary>
/// Fires an error occurred event.
/// </summary>
/// <param name="code">The associated error code.</param>
/// <param name="token">The associated token.</param>
protected void RaiseErrorOccurred(CssParseError code, CssToken token)
{
_tokenizer.RaiseErrorOccurred(code, token.Position);
}
public abstract CssRule Create(CssToken current);
/// <summary>
/// Checks if the provided token is either of the first or the second
/// type of token.
/// </summary>
/// <param name="token">The token to examine.</param>
/// <param name="a">The first type to match.</param>
/// <param name="b">The alternative match for the token.</param>
/// <returns>Result of the examination.</returns>
public static Boolean Is(this CssToken token, CssTokenType a, CssTokenType b)
{
var type = token.Type;
return(type == a || type == b);
}
