private Expression ParseElementAccess(Expression expr)
{
int errorPos = Token.Position;
if (Token.Text[0] != '[')
{
throw Error.ParseError(Token, Res.OpenBracketExpected);
}
NextToken();
Expression[] args;
if (this.Token.Is(TokenId.Identifier))
{
args = new[] { Expression.Constant(Token.Text) };
NextToken();
}
else
{
args = ParseArguments();
}
Token.Validate(TokenId.CloseBracket, Res.CloseBracketOrCommaExpected);
NextToken();
if (expr.Type.IsArray)
{
if (expr.Type.GetArrayRank() != 1 || args.Length != 1)
{
throw Error.ParseError(errorPos, Res.CannotIndexMultiDimArray);
}
Expression index = ExpressionUtility.PromoteExpression(args[0], typeof(int), true);
if (index == null)
{
throw Error.ParseError(errorPos, Res.InvalidIndex);
}
return(Expression.ArrayIndex(expr, index));
}
else
{
MethodBase mb;
switch (TypeUtility.FindIndexer(expr.Type, args, out mb))
{
case 0:
throw Error.ParseError(errorPos, Res.NoApplicableIndexer,
TypeUtility.GetTypeName(expr.Type));
case 1:
return(Expression.Call(expr, (MethodInfo)mb, args));
default:
throw Error.ParseError(errorPos, Res.AmbiguousIndexerInvocation,
TypeUtility.GetTypeName(expr.Type));
}
}
}
