/// <summary>
/// If this next work from the current point in the given string navigator appears to be a recognised pseudo class then this will return a result that
/// will ensure that the current character is identified as a selector-or-property-name content rather than a property-name-value-separator colon (the
/// string navigator passed here will be for the position directly after the colon, which is what is currently being negotiated). Any whitespace at
/// the current position will be moved over when looking for pseudo class content. If the content does not appear to be for a pseudo class then null
/// will be returned and the caller may continue with whatever logic it wants to.
/// </summary>
private CharacterProcessorResult GetPseudoClassHandlingProcessResultIfApplicable(IWalkThroughStrings stringNavigatorAtStartOfPotentialPseudoClass)
{
if (stringNavigatorAtStartOfPotentialPseudoClass == null)
{
throw new ArgumentNullException("stringNavigator");
}
// If the first character of the possible-psuedo-class content is a ":" then it means that we've encountered a "::" (since the first ":" triggered
// this method to be called with the content after it) and that means that it's definitely a psuedo class and not a property name / value pair. As
// such we'll return a process that swallows this second ":" and then processes the next content as selector-or-style-content (and not as property
// name content)
if (stringNavigatorAtStartOfPotentialPseudoClass.CurrentCharacter == ':')
{
var contentProcessor = GetSelectorOrStyleCharacterProcessor();
return(new CharacterProcessorResult(
CharacterCategorisationOptions.SelectorOrStyleProperty,
new SkipCharactersSegment(CharacterCategorisationOptions.SelectorOrStyleProperty, 1, GetSelectorOrStyleCharacterProcessor())
));
}
// Skip over any whitespace to find the start of the next content
var whiteSpaceCharactersToSkipOver = 0;
while (true)
{
var character = stringNavigatorAtStartOfPotentialPseudoClass.CurrentCharacter;
if ((character == null) || !char.IsWhiteSpace(character.Value))
{
break;
}
stringNavigatorAtStartOfPotentialPseudoClass = stringNavigatorAtStartOfPotentialPseudoClass.Next;
whiteSpaceCharactersToSkipOver++;
}
// Determine whether that content (if there is any) matches any of the pseudo classes
if (PseudoClasses.Any(c => stringNavigatorAtStartOfPotentialPseudoClass.DoesCurrentContentMatch(c)))
{
IProcessCharacters contentProcessor = GetSelectorOrStyleCharacterProcessor();
if (whiteSpaceCharactersToSkipOver > 0)
{
contentProcessor = new SkipCharactersSegment(CharacterCategorisationOptions.Whitespace, whiteSpaceCharactersToSkipOver, contentProcessor);
}
return(new CharacterProcessorResult(
CharacterCategorisationOptions.SelectorOrStyleProperty,
contentProcessor
));
}
return(null);
}
