public bool Visit(Ident node)
{
if (node.SymType != null)
{
return(true);
}
var sym = !_inLastNamespace
? _symStack.FindIdent(node.ToString())
: _symStack.FindIdentInScope(node.ToString()) ?? _symStack.FindIdent(node.ToString());
if (sym == null)
{
if (node.ToString() == "result" && _inLastNamespace)
{
throw new Exception(string.Format(
"({0}, {1}) semantic error: procedure does not have return variable '{2}'",
node.Token.Line, node.Token.Column, node.Token.Lexeme));
}
else if (_inLastNamespace)
{
throw new Exception(string.Format(
"({0}, {1}) semantic error: field '{2}' is not defined in this scope",
node.Token.Line, node.Token.Column, node.Token.Lexeme));
}
else
{
throw new Exception(string.Format(
"({0}, {1}) semantic error: identifier '{2}' is not defined",
node.Token.Line, node.Token.Column, node.Token.Lexeme));
}
}
node.SymVar = sym;
node.SymType = sym.VarSymType;
node.IsLValue = !(sym is SymConstant);
return(true);
}
