private DirectiveTriviaSyntax ParseElseDirective(SyntaxToken hash, SyntaxToken keyword, bool isActive, bool endIsActive)
{
var eod = ParseEndOfDirective(false);
if (_directiveStack.HasPreviousIfOrElif())
{
var branchTaken = endIsActive && !_directiveStack.PreviousBranchTaken();
return(new ElseDirectiveTriviaSyntax(
hash,
keyword,
eod,
endIsActive, branchTaken));
}
if (_directiveStack.HasUnfinishedIf())
{
return(WithDiagnostic(new BadDirectiveTriviaSyntax(hash, keyword, eod, isActive), DiagnosticId.EndIfDirectiveExpected, $"Expected #endif directive"));
}
return(WithDiagnostic(new BadDirectiveTriviaSyntax(hash, keyword, eod, isActive), DiagnosticId.UnexpectedDirective, $"Unexpected directive: '{keyword}'"));
}
private void ReadToken()
{
switch (_charReader.Current)
{
case '\0':
if (_includeStack.Count == 1 && _directives.HasUnfinishedIf())
{
_diagnostics.Add(Diagnostic.Create(HlslMessageProvider.Instance, CurrentSpanStart, (int)DiagnosticId.EndIfDirectiveExpected));
}
_kind = SyntaxKind.EndOfFileToken;
break;
case '~':
_kind = SyntaxKind.TildeToken;
NextChar();
break;
case '&':
NextChar();
if (_charReader.Current == '&')
{
_kind = SyntaxKind.AmpersandAmpersandToken;
NextChar();
}
else if (_charReader.Current == '=')
{
_kind = SyntaxKind.AmpersandEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.AmpersandToken;
}
break;
case '|':
NextChar();
if (_charReader.Current == '|')
{
_kind = SyntaxKind.BarBarToken;
NextChar();
}
else if (_charReader.Current == '=')
{
_kind = SyntaxKind.BarEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.BarToken;
}
break;
case '^':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.CaretEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.CaretToken;
}
break;
case '?':
_kind = SyntaxKind.QuestionToken;
NextChar();
break;
case '(':
_kind = SyntaxKind.OpenParenToken;
NextChar();
break;
case ')':
_kind = SyntaxKind.CloseParenToken;
NextChar();
break;
case '[':
_kind = SyntaxKind.OpenBracketToken;
NextChar();
break;
case ']':
_kind = SyntaxKind.CloseBracketToken;
NextChar();
break;
case '{':
_kind = SyntaxKind.OpenBraceToken;
NextChar();
break;
case '}':
_kind = SyntaxKind.CloseBraceToken;
NextChar();
break;
case '.':
if (Char.IsDigit(_charReader.Peek()))
{
ReadNumber();
}
else
{
_kind = SyntaxKind.DotToken;
NextChar();
}
break;
case '+':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.PlusEqualsToken;
NextChar();
}
else if (_charReader.Current == '+')
{
_kind = SyntaxKind.PlusPlusToken;
NextChar();
}
else
{
_kind = SyntaxKind.PlusToken;
}
break;
case '-':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.MinusEqualsToken;
NextChar();
}
else if (_charReader.Current == '-')
{
_kind = SyntaxKind.MinusMinusToken;
NextChar();
}
else
{
_kind = SyntaxKind.MinusToken;
}
break;
case '*':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.AsteriskEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.AsteriskToken;
}
break;
case '/':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.SlashEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.SlashToken;
}
break;
case '%':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.PercentEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.PercentToken;
}
break;
case ',':
_kind = SyntaxKind.CommaToken;
NextChar();
break;
case ';':
_kind = SyntaxKind.SemiToken;
NextChar();
break;
case ':':
NextChar();
if (_charReader.Current == ':')
{
_kind = SyntaxKind.ColonColonToken;
NextChar();
}
else
{
_kind = SyntaxKind.ColonToken;
}
break;
case '=':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.EqualsEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.EqualsToken;
}
break;
case '!':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.ExclamationEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.NotToken;
}
break;
case '<':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.LessThanEqualsToken;
NextChar();
}
else if (_charReader.Current == '<')
{
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.LessThanLessThanEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.LessThanLessThanToken;
}
}
else
{
_kind = SyntaxKind.LessThanToken;
}
break;
case '>':
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.GreaterThanEqualsToken;
NextChar();
}
else if (_charReader.Current == '>')
{
NextChar();
if (_charReader.Current == '=')
{
_kind = SyntaxKind.GreaterThanGreaterThanEqualsToken;
NextChar();
}
else
{
_kind = SyntaxKind.GreaterThanGreaterThanToken;
}
}
else
{
_kind = SyntaxKind.GreaterThanToken;
}
break;
case '"':
ReadString();
break;
default:
if (Char.IsLetter(_charReader.Current) || _charReader.Current == '_')
{
ReadIdentifierOrKeyword();
}
else if (Char.IsDigit(_charReader.Current))
{
ReadNumber();
}
else
{
ReadInvalidCharacter();
}
break;
}
}
