/// <summary>
/// Parses a print term node.
/// Expects that there is an expression node and possibly next print term node.
/// Together it creates a chain of print expressions.
/// </summary>
public void Visit(SelectPrintTermNode node)
{
if (node.exp == null)
{
throw new ArgumentNullException($"{this.GetType()}, failed to access expression.");
}
else
{
node.exp.Accept(this);
}
if (node.next != null)
{
node.next.Accept(this);
}
}
/// <summary>
/// Parses a select print term node.
/// Expecting: expression, expression
/// </summary>
/// <returns> A chain of variable nodes. </returns>
static private Node ParseSelectPrintTerm(ref int position, List <Token> tokens)
{
SelectPrintTermNode selectPrintTermNode = new SelectPrintTermNode();
var expression = ParseExpressionNode(ref position, tokens);
if (expression == null)
{
ThrowError("Select parser", "Expected expression.", position, tokens);
}
else
{
selectPrintTermNode.AddExpression(expression);
}
// Comma signals there is another expression node, next expression must follow.
if (CheckToken(position, Token.TokenType.Comma, tokens))
{
position++;
selectPrintTermNode.AddNext(ParseNextSelectPrintNode(ref position, tokens));
}
return(selectPrintTermNode);
}
public void Visit(SelectPrintTermNode node)
{
throw new NotImplementedException();
}