private StyleObject[] ReadPropertyValues(IStyleSheetLexer lexer)
{
List <StyleObject> values = new List <StyleObject>();
bool exitLoop = false;
while (!exitLoop && !lexer.EndOfStream)
{
IStyleSheetLexerToken token = lexer.Peek();
switch (token.Type)
{
case StyleSheetLexerTokenType.Value:
lexer.Read(out _); // Eat the token
values.Add(new StyleObject(token.Value));
break;
case StyleSheetLexerTokenType.Function:
lexer.Read(out _); // Eat the token
values.Add(ReadFunction(lexer, token.Value));
break;
case StyleSheetLexerTokenType.PropertyEnd:
lexer.Read(out _); // Eat the token
exitLoop = true;
break;
case StyleSheetLexerTokenType.DeclarationEnd:
// Don't eat the token, so that it can be seen by ReadStream.
// Encountering this token means the style sheet is malformed, but we want to handle it gracefully.
exitLoop = true;
break;
}
}
return(values.ToArray());
}
private StyleObject ReadFunction(IStyleSheetLexer lexer, string functionName)
{
List <StyleObject> functionArgs = new List <StyleObject>();
bool exitLoop = false;
while (!exitLoop && lexer.Read(out IStyleSheetLexerToken token))
{
switch (token.Type)
{
case StyleSheetLexerTokenType.Value:
functionArgs.Add(new StyleObject(token.Value));
break;
case StyleSheetLexerTokenType.Function:
functionArgs.Add(ReadFunction(lexer, token.Value));
break;
case StyleSheetLexerTokenType.FunctionArgumentsStart:
break;
case StyleSheetLexerTokenType.FunctionArgumentSeparator:
break;
case StyleSheetLexerTokenType.FunctionArgumentsEnd:
exitLoop = true;
break;
default:
throw new UnexpectedTokenException($"Unexpected token: {token.Type}.");
}
}
StyleObject returnValue = PropertyUtilities.EvaluateFunction(functionName, functionArgs.ToArray(), options.FileReader);
if (returnValue.Type == StyleObjectType.Image)
{
disposableResources.Add(returnValue.GetImage());
}
return(returnValue);
}
private ISelector ReadSelector(IStyleSheetLexer lexer)
{
return(Selector.FromLexer(lexer));
}
public static ISelector FromLexer(IStyleSheetLexer lexer)
{
SelectorBuilder builder = new SelectorBuilder();
bool exitLoop = false;
while (!exitLoop && !lexer.EndOfStream)
{
IStyleSheetLexerToken token = lexer.Peek();
switch (token.Type)
{
case StyleSheetLexerTokenType.Class:
builder.AddClass(token.Value);
break;
case StyleSheetLexerTokenType.PseudoClass:
builder.AddPseudoClass(token.Value);
break;
case StyleSheetLexerTokenType.PseudoElement:
builder.AddPseudoElement(token.Value);
break;
case StyleSheetLexerTokenType.Id:
builder.AddId(token.Value);
break;
case StyleSheetLexerTokenType.Tag:
builder.AddTag(token.Value);
break;
case StyleSheetLexerTokenType.DescendantCombinator:
builder.AddDescendantCombinator();
break;
case StyleSheetLexerTokenType.ChildCombinator:
builder.AddChildCombinator();
break;
case StyleSheetLexerTokenType.AdjacentSiblingCombinator:
builder.AddAdjacentSiblingCombinator();
break;
case StyleSheetLexerTokenType.GeneralSiblingCombinator:
builder.AddGeneralSiblingCombinator();
break;
case StyleSheetLexerTokenType.SelectorSeparator:
builder.AddSelector();
break;
default:
exitLoop = true;
break;
}
if (!exitLoop)
{
lexer.Read(out _);
}
}
return(builder.Build());
}
