//Get an AlgoValue of type EmulatedFunction by supplying an external function load context.
public AlgoValue GetEmulatedFuncValue(algoParser.Stat_loadFuncExtContext context)
{
//Attempt to get the text (as array) of the class and function from obj_access.
if (context.particle().Length != 1)
{
Error.Fatal(context, "Import function is invalid, must be in the form \"Class.Function\".");
return(null);
}
string className = context.IDENTIFIER()[1].GetText();
string funcName = context.particle()[0].IDENTIFIER().GetText();
//Attempt to grab the plugin from the plugins manager.
if (!PluginExists(className))
{
Error.Fatal(context, "Plugin name '" + className + "' is invalid or not loaded.");
return(null);
}
IFunctionPlugin classPlugin = GetPlugin(className);
//Does the plugin contain a function with the given name?
if (classPlugin.Functions.FindIndex(x => x.Name == funcName) == -1)
{
Error.Fatal(context, "Plugin '" + className + "' does not contain a function of name '" + funcName + "', so cannot load it.");
return(null);
}
//Return an EmulatedFunction AlgoValue.
return(new AlgoValue()
{
Type = AlgoValueType.EmulatedFunction,
Value = classPlugin.Functions.Find(x => x.Name == funcName)
});
}
//When an external or internal plugin library function is loaded.
public override object VisitStat_loadFuncExt([NotNull] algoParser.Stat_loadFuncExtContext context)
{
//Get the value of the function.
AlgoValue func = Plugins.GetEmulatedFuncValue(context);
//Check if a variable with the supplied name already exists in scope.
if (Scopes.VariableExists(context.IDENTIFIER()[0].GetText()))
{
Error.Fatal(context, "A variable with the name '" + context.IDENTIFIER()[0].GetText() + "' already exists, can't redefine it.");
return(null);
}
//Add to scope.
Scopes.AddVariable(context.IDENTIFIER()[0].GetText(), func);
return(null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.stat_loadFuncExt"/>.
/// <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_loadFuncExt([NotNull] algoParser.Stat_loadFuncExtContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.stat_loadFuncExt"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitStat_loadFuncExt([NotNull] algoParser.Stat_loadFuncExtContext context)
{
}
