//When a function is defined.
public override object VisitStat_functionDef([NotNull] algoParser.Stat_functionDefContext context)
{
//Does a variable with this name already exist?
if (Scopes.VariableExistsLowest(context.IDENTIFIER().GetText()))
{
Error.Fatal(context, "A variable with this name already exists, cannot create function with this name.");
return(null);
}
//Getting parameters.
List <string> params_ = new List <string>();
if (context.abstract_params() != null)
{
foreach (var param in context.abstract_params().IDENTIFIER())
{
//Check if param already exists.
if (params_.Contains(param.GetText()))
{
Error.Fatal(context, "The parameter with name '" + param.GetText() + "' is already defined in the function.");
return(null);
}
params_.Add(param.GetText());
}
}
//No, it doesn't exist. Define it.
AlgoFunction func = new AlgoFunction(context.statement().ToList(), params_, context.IDENTIFIER().GetText());
AlgoValue funcValue = new AlgoValue()
{
Type = AlgoValueType.Function,
Value = func
};
//Add to scope.
Scopes.AddVariable(context.IDENTIFIER().GetText(), funcValue);
return(null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.stat_functionDef"/>.
/// <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_functionDef([NotNull] algoParser.Stat_functionDefContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.stat_functionDef"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitStat_functionDef([NotNull] algoParser.Stat_functionDefContext context)
{
}
