wip: move things into a "shared" object

packages/core/src/childiter.rs

@@ -1,91 +0,0 @@
-/// This iterator iterates through a list of virtual children and only returns real children (Elements or Text).
-///
-/// This iterator is useful when it's important to load the next real root onto the top of the stack for operations like
-/// "InsertBefore".
-struct RealChildIterator<'a> {
-    scopes: &'a SharedArena,
-
-    // Heuristcally we should never bleed into 5 completely nested fragments/components
-    // Smallvec lets us stack allocate our little stack machine so the vast majority of cases are sane
-    stack: smallvec::SmallVec<[(u16, &'a VNode<'a>); 5]>,
-}
-
-impl<'a> RealChildIterator<'a> {
-    fn new(starter: &'a VNode<'a>, scopes: &'a SharedArena) -> Self {
-        Self {
-            scopes,
-            stack: smallvec::smallvec![(0, starter)],
-        }
-    }
-}
-
-impl<'a> Iterator for RealChildIterator<'a> {
-    type Item = &'a VNode<'a>;
-
-    fn next(&mut self) -> Option<&'a VNode<'a>> {
-        let mut should_pop = false;
-        let mut returned_node = None;
-        let mut should_push = None;
-
-        while returned_node.is_none() {
-            if let Some((count, node)) = self.stack.last_mut() {
-                match node {
-                    // We can only exit our looping when we get "real" nodes
-                    // This includes fragments and components when they're empty (have a single root)
-                    VNode::Element(_) | VNode::Text(_) => {
-                        // We've recursed INTO an element/text
-                        // We need to recurse *out* of it and move forward to the next
-                        should_pop = true;
-                        returned_node = Some(&**node);
-                    }
-
-                    // If we get a fragment we push the next child
-                    VNode::Fragment(frag) => {
-                        let subcount = *count as usize;
-
-                        if frag.children.len() == 0 {
-                            should_pop = true;
-                            returned_node = Some(&**node);
-                        }
-
-                        if subcount >= frag.children.len() {
-                            should_pop = true;
-                        } else {
-                            should_push = Some(&frag.children[subcount]);
-                        }
-                    }
-
-                    // Immediately abort suspended nodes - can't do anything with them yet
-                    // VNode::Suspended => should_pop = true,
-                    VNode::Suspended { real } => todo!(),
-
-                    // For components, we load their root and push them onto the stack
-                    VNode::Component(sc) => {
-                        let scope = self.scopes.try_get(sc.ass_scope.get().unwrap()).unwrap();
-
-                        // Simply swap the current node on the stack with the root of the component
-                        *node = scope.root();
-                    }
-                }
-            } else {
-                // If there's no more items on the stack, we're done!
-                return None;
-            }
-
-            if should_pop {
-                self.stack.pop();
-                if let Some((id, _)) = self.stack.last_mut() {
-                    *id += 1;
-                }
-                should_pop = false;
-            }
-
-            if let Some(push) = should_push {
-                self.stack.push((0, push));
-                should_push = None;
-            }
-        }
-
-        returned_node
-    }
-}