//An "if" statement.
public override object VisitStat_if([NotNull] algoParser.Stat_ifContext context)
{
//Evaluate the check.
AlgoValue checkReturned = (AlgoValue)VisitCheck(context.check());
bool mainCheck = AlgoComparators.GetBooleanValue(checkReturned, context);
//Did it pass? If so, eval the if.
if (mainCheck)
{
//Create scope.
Scopes.AddScope();
//Evaluate the main statement body.
foreach (var statement in context.statement())
{
AlgoValue returned = (AlgoValue)VisitStatement(statement);
if (returned != null)
{
Scopes.RemoveScope();
return(returned);
}
}
//Delete scope.
Scopes.RemoveScope();
//Return.
return(null);
}
//Maincheck failed, complete all the "else if" checks if they exist.
if (context.stat_elif().Length != 0)
{
foreach (var elseifblock in context.stat_elif())
{
//Does the check pass?
var checkContext = elseifblock.check();
AlgoValue elifCheckReturned = (AlgoValue)VisitCheck(checkContext);
bool elseifCheck = AlgoComparators.GetBooleanValue(elifCheckReturned, context);
if (elseifCheck)
{
//Create scope.
Scopes.AddScope();
//Evaluate statements.
foreach (var statement in elseifblock.statement())
{
AlgoValue returned = (AlgoValue)VisitStatement(statement);
if (returned != null)
{
Scopes.RemoveScope();
return(returned);
}
}
//Remove scope.
Scopes.RemoveScope();
//Return.
return(null);
}
}
}
//Is there an else?
if (context.stat_else() != null)
{
//Create a scope.
Scopes.AddScope();
//Evaluate statements.
foreach (var statement in context.stat_else().statement())
{
AlgoValue returned = (AlgoValue)VisitStatement(statement);
if (returned != null)
{
Scopes.RemoveScope();
return(returned);
}
}
//Deleting scope.
Scopes.RemoveScope();
}
//Returning.
return(null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.stat_if"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitStat_if([NotNull] algoParser.Stat_ifContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.stat_if"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitStat_if([NotNull] algoParser.Stat_ifContext context)
{
}
