private ExpressionNode ParsePrimaryExpression()
{
Token tok = curtok;
ExpressionNode result; // TODO: handle error cases (result = null)
switch (curtok.ID)
{
#region Literals
case TokenID.Null:
result = new NullPrimitive(curtok);
Advance();
break;
case TokenID.True:
result = new BooleanPrimitive(true, curtok);
Advance();
break;
case TokenID.False:
result = new BooleanPrimitive(false, curtok);
Advance();
break;
case TokenID.IntLiteral:
result = new IntegralPrimitive(strings[curtok.Data], IntegralType.Int, curtok);
Advance();
break;
case TokenID.UIntLiteral:
result = new IntegralPrimitive(strings[curtok.Data], IntegralType.UInt, curtok);
Advance();
break;
case TokenID.LongLiteral:
result = new IntegralPrimitive(strings[curtok.Data], IntegralType.Long, curtok);
Advance();
break;
case TokenID.ULongLiteral:
result = new IntegralPrimitive(strings[curtok.Data], IntegralType.ULong, curtok);
Advance();
break;
case TokenID.RealLiteral:
result = new RealPrimitive(strings[curtok.Data], curtok);
Advance();
break;
case TokenID.CharLiteral:
result = new CharPrimitive(strings[curtok.Data], curtok);
Advance();
break;
case TokenID.StringLiteral:
result = new StringPrimitive(strings[curtok.Data], curtok);
Advance();
break;
#endregion
#region Predefined Types
case TokenID.Bool:
case TokenID.Byte:
case TokenID.Char:
case TokenID.Decimal:
case TokenID.Double:
case TokenID.Float:
case TokenID.Int:
case TokenID.Long:
case TokenID.Object:
case TokenID.SByte:
case TokenID.Short:
case TokenID.String:
case TokenID.UInt:
case TokenID.ULong:
case TokenID.UShort:
result = new PredefinedTypeNode(tok.ID, tok);
Advance();
result = ParseMemberAccess(result);
break;
#endregion
#region Keywords
case TokenID.This:
{
Advance();
IdentifierExpression idExpr = new IdentifierExpression("this", tok);
idExpr.StartingPredefinedType = tok.ID;
result = idExpr;
break;
}
case TokenID.Base:
Advance(); // over base
if (curtok.ID == TokenID.LBracket) // base indexer expression
{
Advance();
result = new ElementAccessExpression(new IdentifierExpression("base", tok), ParseExpressionList());
AssertAndAdvance(TokenID.RBracket);
break;
}
if (curtok.ID != TokenID.Dot)
{
RecoverFromError(TokenID.Dot, TokenID.LBracket);
result = null;
break;
}
// base access expression
Advance(); // advance over dot
result = new BaseAccessExpression(ParseMember(false));
break;
case TokenID.Checked:
Advance();
AssertAndAdvance(TokenID.LParen);
result = new CheckedExpression(ParseExpression());
AssertAndAdvance(TokenID.RParen);
break;
case TokenID.Unchecked:
Advance();
AssertAndAdvance(TokenID.LParen);
result = new UncheckedExpression(ParseExpression());
AssertAndAdvance(TokenID.RParen);
break;
case TokenID.Default:
Advance();
AssertAndAdvance(TokenID.LParen);
result = new DefaultConstantExpression(ParseType(false));
AssertAndAdvance(TokenID.RParen);
break;
case TokenID.New:
Advance();
isNewStatement = true;
IType newType = ParseType(false);
//ApplyTypeParameters(newType); -> not sure, but a type pointer can not be generic!
if (curtok.ID == TokenID.LParen)
{
Advance();
result = new ObjectCreationExpression(newType, ParseArgumentList(), tok);
AssertAndAdvance(TokenID.RParen);
}
else if (curtok.ID == TokenID.LBracket)
{
result = ParseArrayCreation(newType);
}
else
{
RecoverFromError(TokenID.LParen, TokenID.LBracket);
result = null;
}
isNewStatement = false;
break;
case TokenID.Typeof:
Advance();
AssertAndAdvance(TokenID.LParen);
result = new TypeOfExpression(ParseType(false));
CheckRankSpecifier(result);
AssertAndAdvance(TokenID.RParen);
break;
case TokenID.Sizeof:
Advance();
AssertAndAdvance(TokenID.LParen);
result = new SizeOfExpression(ParseType(false));
AssertAndAdvance(TokenID.RParen);
break;
case TokenID.Delegate: //anonymous method
Advance();
result = ParseAnonymousMethod();
break;
#endregion Keywords
case TokenID.Ident:
result = ParseIdentifierOrKeyword(false, false, false, false, false);
if (curtok.ID == TokenID.ColonColon)
{
// id :: id type-parameter-list_opt . id type-parameter-list_opt
QualifiedIdentifierExpression qualID = new QualifiedIdentifierExpression(curtok); // TODO: Replace by QualifiedAliasMember instance
qualID.IsNamespaceAliasQualifier = true;
qualID.Expressions.Add(result);
Advance(); // over ColonColon
qualID.Expressions.Add(ParseMember(false));
result = ParseMemberAccess(qualID);
}
else if (ParsePossibleTypeParameterNode(false, false, false, false))
{
result = new TypeNode(result);
ApplyTypeParameters((TypeNode)result);
}
break;
case TokenID.LParen:
Advance();
result = ParseCastOrGroup();
break;
default:
RecoverFromError("Unexpected token in primary expression");
return null; // TODO: Invalid expression
}
return result;
}
public virtual object VisitNullPrimitive(NullPrimitive nullPrimitive, object data)
{
return(null);
}
public virtual object VisitNullPrimitive(NullPrimitive nullPrimitive, object data)
{
return null;
}