// handles emiting the correct instructions for the function
public override int VisitFunction_call(YarnSpinnerParser.Function_callContext context)
{
string functionName = context.FUNC_ID().GetText();
this.GenerateCodeForFunctionCall(functionName, context, context.expression());
return(0);
}
// emits the required bytecode for the function call
private void GenerateCodeForFunctionCall(string functionName, YarnSpinnerParser.Function_callContext functionContext, YarnSpinnerParser.ExpressionContext[] parameters)
{
// generate the instructions for all of the parameters
foreach (var parameter in parameters)
{
this.Visit(parameter);
}
// push the number of parameters onto the stack
this.compiler.Emit(OpCode.PushFloat, functionContext.Start, new Operand(parameters.Length));
// then call the function itself
this.compiler.Emit(OpCode.CallFunc, functionContext.Start, new Operand(functionName));
}
public override string VisitFunction_call([NotNull] YarnSpinnerParser.Function_callContext context)
{
var functionName = context.FUNC_ID().GetText();
if (functionName.Equals("visited") || functionName.Equals("visited_count"))
{
// we aren't bothering to test anything about the value itself
// if it isn't a static string we'll get back null so can ignore it
// if the func has more than one parameter later on it will cause an error so again can ignore
var result = Visit(context.expression()[0]);
if (result != null)
{
TrackingNode.Add(result);
}
}
return(null);
}
/// <summary>
/// Exit a parse tree produced by <see cref="YarnSpinnerParser.function_call"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitFunction_call([NotNull] YarnSpinnerParser.Function_callContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="YarnSpinnerParser.function_call"/>.
/// <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 VisitFunction_call([NotNull] YarnSpinnerParser.Function_callContext context)
{
return(VisitChildren(context));
}