public override Expression VisitVariable(CMMParser.VariableContext context)
{
var text = context.GetText();
if (_fields.TryGetValue(text, out var expr))
{
return(expr);
}
_fields.Add(text, null);
return(null);
}
/// <summary>
/// Exit a parse tree produced by the <c>Variable</c>
/// labeled alternative in <see cref="CMMParser.expression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitVariable([NotNull] CMMParser.VariableContext context)
{
}
/// <summary>
/// Visit a parse tree produced by the <c>Variable</c>
/// labeled alternative in <see cref="CMMParser.expression"/>.
/// <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 VisitVariable([NotNull] CMMParser.VariableContext context)
{
return(VisitChildren(context));
}
