protected override AbstractSyntaxTree GenerateCodeForValue(CodeGenContext context, EvaluationIntention purpose)
{
var functionToCall = Left.GenerateCodeForValueWithPrettyPrint(context, EvaluationIntention.ValueOrNode);
// NB: Function calls are binary operators in the sense that they have two arguments.
// The first argument is the function to call, and the second is:
// possibly null -- if no arguments are supplied, or,
// a single parameter -- if one argument is supplied, or,
// a tree of ArgumentSeparator, whose left is
// a single parameter, or,
// a tree of ArugmentSeparator ...
// and whose Right is a single parameter.
var argCount = context.EvaluateArgumentList(Right);
if (functionToCall == null)
{
context.GenerateInstruction("ICALL", string.Format("#{0}", argCount));
}
else if (functionToCall is VariableTreeNode variable)
{
context.GenerateInstruction("CALL", variable.Value.ToString(), string.Format("#{0}", argCount));
}
else
{
throw new AssertionFailedException("unknown function");
}
if (purpose == EvaluationIntention.SideEffectsOnly)
{
context.GenerateInstruction("POP");
}
return(null);
}
