openscad-graph-editor

using System.Linq;
using GodotExt;
using OpenScadGraphEditor.Library;
using OpenScadGraphEditor.Utils;

namespace OpenScadGraphEditor.Refactorings
{
    public class DeleteVariableRefactoring : Refactoring
    {
        private readonly VariableDescription _description;

        public DeleteVariableRefactoring(VariableDescription description)
        {
            _description = description;
        }

        public override void PerformRefactoring(RefactoringContext context)
        {
            // find all nodes that somehow refer to this variable
            context.Project.FindAllReferencingNodes(_description)
                // create a deletion refactoring for them
                .Select(it => new DeleteNodeRefactoring(it.Graph, it.Node) )
                .ToList() // avoid modifying the project while still reading it
                // and perform the deletion refactorings
                .ForAll(context.PerformRefactoring);

            if (context.Project.IsDefinedInThisProject(_description))
            {
                // finally delete the variable entry from the project
                context.Project.RemoveVariable(_description);
            }
            else
            {
                // find the external reference that defined it
                if (context.Project.TryGetExternalReferenceHolding(_description, out var externalReference))
                {
                    externalReference.Variables.Remove(externalReference.Variables.First(it => it.Id == _description.Id));
                }
                else
                {
                    GdAssert.That(false, "Could not find external reference holding the variable");
                }
            }
        }
    }
}