private void ReadStream(Stream stream)
{
using (IStyleSheetLexer lexer = new StyleSheetLexer(stream)) {
IRuleset currentRuleset = null;
string currentPropertyName = string.Empty;
while (!lexer.EndOfStream)
{
IStyleSheetLexerToken token = lexer.Peek();
switch (token.Type)
{
case StyleSheetLexerTokenType.DeclarationEnd:
rulesets.Add(currentRuleset);
break;
case StyleSheetLexerTokenType.PropertyName:
currentPropertyName = token.Value;
break;
case StyleSheetLexerTokenType.Value:
case StyleSheetLexerTokenType.Function: {
StyleObject[] propertyValues = ReadPropertyValues(lexer);
IProperty property = null;
try {
property = Property.Create(currentPropertyName, propertyValues);
}
catch (Exception ex) {
if (!options.IgnoreInvalidProperties)
{
throw ex;
}
}
if (property != null)
{
currentRuleset.AddProperty(property);
}
}
continue;
case StyleSheetLexerTokenType.Tag:
case StyleSheetLexerTokenType.Class:
case StyleSheetLexerTokenType.Id:
currentRuleset = new Ruleset(ReadSelector(lexer));
continue;
}
// Consume the current token.
lexer.Read(out _);
}
}
}
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());
}
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());
}