//When an enum is first defined.
public override object VisitStat_enumDef([NotNull] algoParser.Stat_enumDefContext context)
{
//Check if the variable already exists at local scope.
if (Scopes.VariableExistsLowest(context.IDENTIFIER().GetText()))
{
Error.Fatal(context, "A variable with the name '" + context.IDENTIFIER().GetText() + "'already exists, cannot create a duplicate.");
return(null);
}
//Create an object for the enum.
AlgoObject enumObj = new AlgoObject();
//For each enum member, create a child in the object with an integer value.
BigInteger enumIndex = 0;
if (context.abstract_params() != null)
{
foreach (var id in context.abstract_params().IDENTIFIER())
{
//Does a member with this name already exist?
if (enumObj.ObjectScopes.VariableExists(id.GetText()))
{
Error.Fatal(context, "An enum member with the name '" + id.GetText() + "' already exists.");
return(null);
}
//Add member.
enumObj.ObjectScopes.AddVariable(id.GetText(), new AlgoValue()
{
Type = AlgoValueType.Integer,
Value = enumIndex
});
enumIndex++;
}
}
//Create an enum variable with this name.
Scopes.AddVariable(context.IDENTIFIER().GetText(), new AlgoValue()
{
Type = AlgoValueType.Object,
Value = enumObj
});
return(null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.stat_enumDef"/>.
/// <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_enumDef([NotNull] algoParser.Stat_enumDefContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.stat_enumDef"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitStat_enumDef([NotNull] algoParser.Stat_enumDefContext context)
{
}
