public PrinterNode Visit(IndexNode node)
{
var pNode = new PrinterNode("Index");
pNode.AddChild(node.Operand.Accept(this));
pNode.AddChild(node.IndexExpr.Accept(this));
return(pNode);
}
public bool Visit(IndexNode node)
{
if (node.Type != null)
{
return(true);
}
node.Operand.Accept(this);
node.IndexExpr.Accept(this);
var token = ExprNode.GetClosestToken(node.Operand);
if (node.Operand.Type is SymArray arrayType)
{
node.Type = arrayType.Type;
}
else if (node.Operand.Type is OpenArray openArrayType)
{
node.Type = openArrayType.InnerType;
}
else
{
throw new ArrayExpectedException(node.Operand.Type, token.Lexeme, token.Line, token.Column);
}
node.IsLvalue = true;
_typeChecker.RequireCast(_stack.SymInt, ref node.IndexExpr);
//try to compute index value
var indexEvalVisitor = new EvalConstExprVisitor(ExprNode.GetClosestToken(node.IndexExpr), _stack);
try {
var indexConst = node.IndexExpr.Accept(indexEvalVisitor) as SymIntConst;
// requireCast above guarantees that it is not null
node.IndexExpr = new IntegerNode(new IntegerToken(indexConst.Value, token.Line, token.Column));
if (!(node.Operand.Type is SymArray arrayT))
{
return(true);
}
if (!(arrayT.MinIndex.Value <= indexConst.Value && indexConst.Value <= arrayT.MaxIndex.Value))
{
throw new RangeCheckErrorException(indexConst.Value, arrayT.MinIndex.Value,
arrayT.MaxIndex.Value, token.Line, token.Column);
}
}
catch (ConstExprEvalException) {
return(true);
}
return(true);
}