From 76cb9c2a39d477a64824a985ade40507e3bbade1 Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@adammathes.com>
Date: Fri, 13 Feb 2026 21:34:48 -0800
Subject: feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

---
 .../parse5/dist/parser/formatting-element-list.js  | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 vanilla/node_modules/parse5/dist/parser/formatting-element-list.js

(limited to 'vanilla/node_modules/parse5/dist/parser/formatting-element-list.js')

diff --git a/vanilla/node_modules/parse5/dist/parser/formatting-element-list.js b/vanilla/node_modules/parse5/dist/parser/formatting-element-list.js
new file mode 100644
index 0000000..b9ce95b
--- /dev/null
+++ b/vanilla/node_modules/parse5/dist/parser/formatting-element-list.js
@@ -0,0 +1,110 @@
+//Const
+const NOAH_ARK_CAPACITY = 3;
+export var EntryType;
+(function (EntryType) {
+    EntryType[EntryType["Marker"] = 0] = "Marker";
+    EntryType[EntryType["Element"] = 1] = "Element";
+})(EntryType || (EntryType = {}));
+const MARKER = { type: EntryType.Marker };
+//List of formatting elements
+export class FormattingElementList {
+    constructor(treeAdapter) {
+        this.treeAdapter = treeAdapter;
+        this.entries = [];
+        this.bookmark = null;
+    }
+    //Noah Ark's condition
+    //OPTIMIZATION: at first we try to find possible candidates for exclusion using
+    //lightweight heuristics without thorough attributes check.
+    _getNoahArkConditionCandidates(newElement, neAttrs) {
+        const candidates = [];
+        const neAttrsLength = neAttrs.length;
+        const neTagName = this.treeAdapter.getTagName(newElement);
+        const neNamespaceURI = this.treeAdapter.getNamespaceURI(newElement);
+        for (let i = 0; i < this.entries.length; i++) {
+            const entry = this.entries[i];
+            if (entry.type === EntryType.Marker) {
+                break;
+            }
+            const { element } = entry;
+            if (this.treeAdapter.getTagName(element) === neTagName &&
+                this.treeAdapter.getNamespaceURI(element) === neNamespaceURI) {
+                const elementAttrs = this.treeAdapter.getAttrList(element);
+                if (elementAttrs.length === neAttrsLength) {
+                    candidates.push({ idx: i, attrs: elementAttrs });
+                }
+            }
+        }
+        return candidates;
+    }
+    _ensureNoahArkCondition(newElement) {
+        if (this.entries.length < NOAH_ARK_CAPACITY)
+            return;
+        const neAttrs = this.treeAdapter.getAttrList(newElement);
+        const candidates = this._getNoahArkConditionCandidates(newElement, neAttrs);
+        if (candidates.length < NOAH_ARK_CAPACITY)
+            return;
+        //NOTE: build attrs map for the new element, so we can perform fast lookups
+        const neAttrsMap = new Map(neAttrs.map((neAttr) => [neAttr.name, neAttr.value]));
+        let validCandidates = 0;
+        //NOTE: remove bottommost candidates, until Noah's Ark condition will not be met
+        for (let i = 0; i < candidates.length; i++) {
+            const candidate = candidates[i];
+            // We know that `candidate.attrs.length === neAttrs.length`
+            if (candidate.attrs.every((cAttr) => neAttrsMap.get(cAttr.name) === cAttr.value)) {
+                validCandidates += 1;
+                if (validCandidates >= NOAH_ARK_CAPACITY) {
+                    this.entries.splice(candidate.idx, 1);
+                }
+            }
+        }
+    }
+    //Mutations
+    insertMarker() {
+        this.entries.unshift(MARKER);
+    }
+    pushElement(element, token) {
+        this._ensureNoahArkCondition(element);
+        this.entries.unshift({
+            type: EntryType.Element,
+            element,
+            token,
+        });
+    }
+    insertElementAfterBookmark(element, token) {
+        const bookmarkIdx = this.entries.indexOf(this.bookmark);
+        this.entries.splice(bookmarkIdx, 0, {
+            type: EntryType.Element,
+            element,
+            token,
+        });
+    }
+    removeEntry(entry) {
+        const entryIndex = this.entries.indexOf(entry);
+        if (entryIndex !== -1) {
+            this.entries.splice(entryIndex, 1);
+        }
+    }
+    /**
+     * Clears the list of formatting elements up to the last marker.
+     *
+     * @see https://html.spec.whatwg.org/multipage/parsing.html#clear-the-list-of-active-formatting-elements-up-to-the-last-marker
+     */
+    clearToLastMarker() {
+        const markerIdx = this.entries.indexOf(MARKER);
+        if (markerIdx === -1) {
+            this.entries.length = 0;
+        }
+        else {
+            this.entries.splice(0, markerIdx + 1);
+        }
+    }
+    //Search
+    getElementEntryInScopeWithTagName(tagName) {
+        const entry = this.entries.find((entry) => entry.type === EntryType.Marker || this.treeAdapter.getTagName(entry.element) === tagName);
+        return entry && entry.type === EntryType.Element ? entry : null;
+    }
+    getElementEntry(element) {
+        return this.entries.find((entry) => entry.type === EntryType.Element && entry.element === element);
+    }
+}
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