private MemberSyntax ParseFunctionDeclaration(List <SyntaxToken> prefixes)
{
var isPublic = false;
var isVirtual = false;
var isOverride = false;
foreach (SyntaxToken s in prefixes)
{
switch (s.Kind)
{
case SyntaxKind.SetKeyword:
if (!isPublic)
{
isPublic = true;
}
else
{
_diagnostics.ReportMemberAlreadyRecieved(s.Location, s.Text);
}
break;
case SyntaxKind.VirtualKeyword:
if (!isVirtual)
{
isVirtual = true;
}
else
{
_diagnostics.ReportMemberAlreadyRecieved(s.Location, s.Text);
}
break;
case SyntaxKind.OverrideKeyword:
if (!isOverride)
{
isOverride = true;
}
else
{
_diagnostics.ReportMemberAlreadyRecieved(s.Location, s.Text);
}
break;
case SyntaxKind.AbstractKeyword:
_diagnostics.ReportFunctionCantBeAbstract(s.Location);
break;
default:
_diagnostics.ReportMemberCantUseModifier(s.Location, "Class", s.Text);
break;
}
}
var functionKeyword = MatchToken(SyntaxKind.FunctionKeyword);
var identifier = MatchToken(SyntaxKind.IdentifierToken);
var openParenthesisToken = MatchToken(SyntaxKind.OpenParenthesisToken);
var parameters = ParseParameterList();
var closeParenthesisToken = MatchToken(SyntaxKind.CloseParenthesisToken);
var type = ParseOptionalTypeClause();
var body = ParseBlockStatement();
return(new FunctionDeclarationSyntax(_syntaxTree, functionKeyword, identifier, openParenthesisToken, parameters, closeParenthesisToken, type, body, isPublic, isVirtual, isOverride));
}
