public Token(TokenDescriptor descriptor, int line, int column, string value)
{
Descriptor = descriptor;
Line = line;
Column = column;
Value = value;
}
public ParsingState <T> WhenNextTokenIs(TokenDescriptor descriptor, Action <ParsingState <T> > action)
{
// Ignore white spaces
InvokeIfMatching(descriptor, action);
return(this);
}
private bool IsDeclModifier(TokenDescriptor tokenDescriptor)
{
return(tokenDescriptor.Kind == TokenKind.Keyword &&
(tokenDescriptor == TokenDescriptor.InternalKeyword ||
tokenDescriptor == TokenDescriptor.PublicKeyword ||
tokenDescriptor == TokenDescriptor.ProtectedKeyword ||
tokenDescriptor == TokenDescriptor.PrivateKeyword ||
tokenDescriptor == TokenDescriptor.AbstractKeyword
));
}
public ParsingState <T> Expect(TokenDescriptor descriptor, Action <ParsingState <T> >?action = null)
{
if (InvokeIfMatching(descriptor, action))
{
return(this);
}
var actualToken = _lexer.PeekToken();
throw new CaliParseException($"Expected '{descriptor.ReportableName}' but found '{actualToken.Value}'", 0,
0);
}
private bool InvokeIfMatching(TokenDescriptor descriptor, Action <ParsingState <T> >?action)
{
// Ignore white spaces
while (_lexer.PeekToken().Descriptor == TokenDescriptor.Space)
{
_lexer.NextToken();
}
if (_lexer.PeekToken().Descriptor == descriptor)
{
action?.Invoke(this);
return(true);
}
return(false);
}
public ParsingState <T> Expect(TokenDescriptor descriptor, Action <T, Token> action)
{
// Ignore white spaces
while (_lexer.PeekToken().Descriptor == TokenDescriptor.Space)
{
_lexer.NextToken();
}
if (_lexer.PeekToken().Descriptor == descriptor)
{
action(Syntax, _lexer.NextToken());
}
else
{
throw new CaliParseException(
$"Expecting '{descriptor.ReportableName}' but found '{_lexer.PeekToken().Value}'",
_lexer.PeekToken());
}
return(this);
}
internal TokenState(Lexer lexer, TokenDescriptor descriptor)
{
_lexer = lexer;
Descriptor = descriptor;
}