vendor tsgo

tools/tsgo/internal/project/dirty/box.go

@@ -0,0 +1,62 @@
+package dirty
+
+type Box[T Cloneable[T]] struct {
+	original T
+	value    T
+	dirty    bool
+	delete   bool
+}
+
+func NewBox[T Cloneable[T]](original T) *Box[T] {
+	return &Box[T]{original: original, value: original}
+}
+
+func (b *Box[T]) Value() T {
+	if b.delete {
+		var zero T
+		return zero
+	}
+	return b.value
+}
+
+func (b *Box[T]) Original() T {
+	return b.original
+}
+
+func (b *Box[T]) Dirty() bool {
+	return b.dirty
+}
+
+func (b *Box[T]) Set(value T) {
+	b.value = value
+	b.delete = false
+	b.dirty = true
+}
+
+func (b *Box[T]) Change(apply func(T)) {
+	if !b.dirty {
+		b.value = b.value.Clone()
+		b.dirty = true
+	}
+	apply(b.value)
+}
+
+func (b *Box[T]) ChangeIf(cond func(T) bool, apply func(T)) bool {
+	if cond(b.value) {
+		b.Change(apply)
+		return true
+	}
+	return false
+}
+
+func (b *Box[T]) Delete() {
+	b.delete = true
+}
+
+func (b *Box[T]) Locked(fn func(Value[T])) {
+	fn(b)
+}
+
+func (b *Box[T]) Finalize() (T, bool) {
+	return b.Value(), b.dirty || b.delete
+}