/// <summary>
/// Checks the static semantic constraints of an IOPrintNode.
/// </summary>
/// <returns>An ISemanticCheckValue.</returns>
/// <param name="node">Node.</param>
public ISemanticCheckValue VisitIOPrintNode(IOPrintNode node)
{
// check the expression of this node
node.Expression.Accept(this.typeChecker).asProperty();
return(voidProperty);
}
public IOPrintNode CreateIOPrintNode(StatementsNode statementsNode, Token t)
{
IOPrintNode ioPrintNode = new IOPrintNode(t);
statementsNode.Statement = ioPrintNode;
return(ioPrintNode);
}
/// <summary>
/// Visits the IO print node.
/// </summary>
/// <returns>An ISemanticCheckValue.</returns>
/// <param name="node">Node.</param>
public ISemanticCheckValue VisitIOPrintNode(IOPrintNode node)
{
// evaluate the expression and the print it
IProperty evaluation = node.Expression.Accept(this).asProperty();
printer.print(evaluation.asString());
return(voidProperty);
}
/// <summary>
/// Parses a print statement into an IOPrintNode
/// </summary>
/// <returns>The next token.</returns>
/// <param name="token">Token.</param>
/// <param name="statementsNode">A StatementsNode.</param>
private Token ParsePrint(Token token, StatementsNode statementsNode)
{
try {
// build the print statement node
IOPrintNode printNode = nodeBuilder.CreateIOPrintNode(statementsNode, token);
// parse the expression to print
return(ParseExpression(scanner.getNextToken(token), printNode));
} catch (UnexpectedTokenException ex) {
return(FastForwardToStatementEnd(ex));
}
}
/// <summary>
/// Visits the IO print node.
/// </summary>
/// <returns>An ISemanticCheckValue.</returns>
/// <param name="node">Node.</param>
public ISemanticCheckValue VisitIOPrintNode(IOPrintNode node)
{
// nothing to evaluate here, it's done from the ExecutionVisitor
return(voidProperty);
}
/// <summary>
/// Visits the IO print node.
/// </summary>
/// <returns>An ISemanticCheckValue.</returns>
/// <param name="node">Node.</param>
public ISemanticCheckValue VisitIOPrintNode(IOPrintNode node)
{
// return the node's expression's evaluation
return(node.Expression.Accept(this));
}