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16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 18x 2x 2x 2x 16x 18x 256x 256x 256x 256x 256x 256x 1609x 1579x 1581x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1609x 256x 256x 256x 256x 256x 256x 256x 6x 6x 6x 12x 12x 12x 6x 256x 256x 256x 256x 256x 256x 256x 201x 191x 191x 201x 421x 421x 191x 201x 256x 256x 256x 256x 256x 256x 256x 612x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 612x 256x 256x 256x 256x 256x 256x 1324x 172x 6x 6x 6x 6x 6x 6x 6x 6x 6x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 6x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 6x 6x 6x 1324x 256x | import { AvenxErrorCodes, formatMessage } from '../runtime/AvenxError.js';
import { sanitizeUrlAttribute, isUrlAttribute } from '../security/urlPolicy.js';
import { isEventHandlerAttribute } from '../security/eventAttributes.js';
import { logger } from '../runtime/AvenxLogger.js';
import { HtmlEscaper, SafeHtml } from '../security/escapeHtml.js';
import { isBooleanAttribute } from './constants.js';
import { profile, getComponentProfilingInfo } from '../utils/profiler.js';
import { tracer } from '../trace/tracer.js';
import { traceDomOp, clampDomValue } from '../trace/dom.js';
import { findScope } from './bindingScope.js';
const escaper = new HtmlEscaper();
/**
* Compares two class attribute strings as unordered token sets, ignoring extra
* whitespace and token order, so redundant DOM mutations are skipped when the
* effective class list is unchanged.
* @param {string|null} a
* @param {string|null} b
* @returns {boolean}
*/
function classTokensEqual(a, b) {
const tokensOf = (value) => {
if (value == null) return [];
return Array.from(new Set(String(value).trim().split(/\s+/).filter(Boolean))).sort();
};
const aTokens = tokensOf(a);
const bTokens = tokensOf(b);
if (aTokens.length !== bTokens.length) {
return false;
}
return aTokens.every((token, index) => token === bTokens[index]);
}
/**
* Helper to compute transition/animation duration from element computed styles.
* @param {Element} el
* @returns {number} duration in ms
*/
function getTransitionDuration(el) {
if (!el || typeof window === 'undefined' || !window.getComputedStyle) return 0;
const styles = window.getComputedStyle(el);
const transitionDelay = styles.transitionDelay || '';
const transitionDuration = styles.transitionDuration || '';
const animationDelay = styles.animationDelay || '';
const animationDuration = styles.animationDuration || '';
const parseTime = (timeStr) => {
if (!timeStr) return 0;
const times = timeStr.split(',').map((t) => {
const match = t.trim().match(/^([0-9.]+)(s|ms)$/i);
if (!match) return 0;
const val = parseFloat(match[1]);
const unit = match[2].toLowerCase();
return unit === 'ms' ? val : val * 1000;
});
return Math.max(...times, 0);
};
const tDuration = parseTime(transitionDuration);
const tDelay = parseTime(transitionDelay);
const aDuration = parseTime(animationDuration);
const aDelay = parseTime(animationDelay);
return Math.max(tDuration + tDelay, aDuration + aDelay);
}
/**
* The DOMParser used for every patch.
*
* One instance rather than one per patch. Constructing a DOMParser is not free,
* and the update path runs it on every component on every flush.
* @type {DOMParser|null}
*/
let parserInstance = null;
/**
* Returns the shared DOMParser, creating it on first use.
* @returns {DOMParser} The parser.
*/
function sharedParser() {
if (!parserInstance) {
parserInstance = new DOMParser();
}
return parserInstance;
}
/**
* Applies the URL policy to every URL-bearing attribute in a parsed tree.
* @param {Element} root - The root of the freshly parsed render output.
*/
function sanitizeUrlsIn(root) {
if (!root || typeof root.querySelectorAll !== 'function') {
return;
}
const elements = [root, ...Array.from(root.querySelectorAll('*'))];
for (const el of elements) {
if (!el || !el.attributes || typeof el.setAttribute !== 'function') continue;
// Copied first: sanitising mutates the collection being iterated.
const attrs = Array.from(el.attributes);
for (const attr of attrs) {
if (!isUrlAttribute(attr.name)) continue;
const safe = sanitizeUrlAttribute(attr.name, attr.value);
if (safe !== attr.value) {
el.setAttribute(attr.name, safe);
}
}
}
}
/**
* Handles patching the DOM with new HTML content using a simple diffing algorithm.
* This approach is more efficient than innerHTML as it preserves existing DOM nodes.
*/
export class DomPatcher {
/**
* Patches the target element with the provided HTML.
* @param {Element} target - The element to patch.
* @param {string} html - The new HTML content.
* @param {function(string): any} [resolveExpression] - Function to evaluate expressions.
* @param {object} [app] - The application context.
*/
patch(target, html, resolveExpression, app) {
const { enableProfiling, componentName } = getComponentProfilingInfo(target);
profile(enableProfiling, componentName, 'patch', () => {
const newDoc = sharedParser().parseFromString(html, 'text/html');
const parserError =
newDoc && typeof newDoc.querySelector === 'function' ? newDoc.querySelector('parsererror') : null;
if (parserError) {
const errorMsg = parserError.textContent ? parserError.textContent.trim() : 'Unknown parsing error';
logger.warn(formatMessage(AvenxErrorCodes.DOM_PARSING_FAILED, errorMsg, html));
return;
}
const newRoot = newDoc.body;
// Sanitised here, on the whole parsed tree, because this is the one point
// every rendered node passes through. Doing it only in the attribute-sync
// path missed the first render, where nodes are inserted wholesale rather
// than attribute by attribute -- so a javascript: href was live until
// something else caused that attribute to be re-set.
sanitizeUrlsIn(newRoot);
this.flattenTransitionTags(newRoot);
const prevSession = this.sessionElements;
const prevRoot = this.patchRoot;
this.sessionElements = new Set();
this.patchRoot = target;
try {
this.#patchNode(target, newRoot, true, true, resolveExpression, app);
this.flushLifecycleHooks(app);
} finally {
this.sessionElements = prevSession;
this.patchRoot = prevRoot;
}
});
}
/**
* Patches an existing element with a new element structure in-place.
* @param {Element} oldElement - The existing element.
* @param {Element} newElement - The new element structure.
* @param {function(string): any} [resolveExpression] - Function to evaluate expressions.
* @param {object} [app] - The application context.
*/
patchElement(oldElement, newElement, resolveExpression, app) {
const { enableProfiling, componentName } = getComponentProfilingInfo(oldElement);
profile(enableProfiling, componentName, 'patch', () => {
this.flattenTransitionTags(newElement);
const prevSession = this.sessionElements;
const prevRoot = this.patchRoot;
this.sessionElements = new Set();
this.patchRoot = oldElement;
try {
this.#patchNode(oldElement, newElement, false, true, resolveExpression, app);
this.flushLifecycleHooks(app);
} finally {
this.sessionElements = prevSession;
this.patchRoot = prevRoot;
}
});
}
/**
* Recursively diffs and patches two nodes.
* @param {Node} oldNode - The existing DOM node.
* @param {Node} newNode - The new node structure.
* @param {boolean} [isBodyWrapper] - Whether the new node is a temporary body wrapper.
* @param {boolean} [isPatchRoot] - Whether this is the root node of the patching operation.
* @param {function(string): any} [resolveExpression] - Function to evaluate expressions.
* @param {object} [app] - The application context.
* @private
*/
#patchNode(oldNode, newNode, isBodyWrapper = false, isPatchRoot = false, resolveExpression, app) {
if (
!isPatchRoot &&
oldNode.nodeType === Node.ELEMENT_NODE &&
oldNode.nodeName === 'SLOT' &&
oldNode.hasAttribute('data-avenx-transcluded')
) {
if (newNode.nodeType === Node.ELEMENT_NODE) {
this.#patchAttributes(oldNode, newNode);
oldNode.setAttribute('data-avenx-transcluded', 'true');
if (resolveExpression) {
this.#applyDirectives(oldNode, resolveExpression, app);
}
}
return;
}
if (
!isPatchRoot &&
oldNode.nodeType === Node.ELEMENT_NODE &&
(oldNode.hasAttribute('data-avenx-comp') || oldNode.hasAttribute('data-avenx-comp-dynamic'))
) {
if (newNode.nodeType === Node.ELEMENT_NODE) {
this.#patchAttributes(oldNode, newNode);
const compInstance = oldNode.__avenx_comp_instance;
if (compInstance && typeof compInstance.__updateTranscludedContent === 'function') {
compInstance.__updateTranscludedContent(newNode.childNodes);
}
if (resolveExpression) {
this.#applyDirectives(oldNode, resolveExpression, app);
}
}
return;
}
if (
!isPatchRoot &&
oldNode.nodeType === Node.ELEMENT_NODE &&
(oldNode.tagName.toLowerCase() === 'template' || oldNode.tagName.toLowerCase() === '@for')
) {
if (newNode.nodeType === Node.ELEMENT_NODE) {
this.#patchAttributes(oldNode, newNode);
}
return;
}
if (!isPatchRoot && oldNode.nodeType === Node.ELEMENT_NODE && oldNode.hasAttribute('data-ax-static')) {
return;
}
if (
!isPatchRoot &&
oldNode.nodeType === Node.ELEMENT_NODE &&
newNode.nodeType === Node.ELEMENT_NODE &&
oldNode.hasAttribute('data-ax-memo') &&
typeof oldNode.isEqualNode === 'function' &&
oldNode.isEqualNode(newNode)
) {
return;
}
if (
!isPatchRoot &&
oldNode.nodeType === Node.ELEMENT_NODE &&
oldNode.hasAttribute('data-ax-deadlock') &&
typeof oldNode.querySelector === 'function' &&
oldNode.querySelector('.ax-deadlock-fallback')
) {
return;
}
// 1. Update attributes if it's an element (skip if it is the temporary body wrapper)
let skipChildren = false;
if (!isBodyWrapper && oldNode.nodeType === Node.ELEMENT_NODE && newNode.nodeType === Node.ELEMENT_NODE) {
this.#patchAttributes(oldNode, newNode);
if (resolveExpression) {
skipChildren = this.#applyDirectives(oldNode, resolveExpression, app);
}
}
if (skipChildren) {
return;
}
// 2. Diff children
const oldChildrenRaw = Array.from(oldNode.childNodes).filter((child) => !child._isLeaving);
const newChildrenRaw = Array.from(newNode.childNodes);
const oldChildren = [];
for (const child of oldChildrenRaw) {
if (child.nodeType === Node.TEXT_NODE) {
const last = oldChildren[oldChildren.length - 1];
if (last && last.nodeType === Node.TEXT_NODE) {
last.textContent += child.textContent;
if (child.parentNode) {
child.parentNode.removeChild(child);
}
} else {
oldChildren.push(child);
}
} else {
oldChildren.push(child);
}
}
const newChildren = [];
for (const child of newChildrenRaw) {
if (child.nodeType === Node.TEXT_NODE) {
const last = newChildren[newChildren.length - 1];
if (last && last.nodeType === Node.TEXT_NODE) {
last.textContent += child.textContent;
if (child.parentNode) {
child.parentNode.removeChild(child);
}
} else {
newChildren.push(child);
}
} else {
newChildren.push(child);
}
}
let oldIndex = 0;
let newIndex = 0;
while (newIndex < newChildren.length) {
const newChild = newChildren[newIndex];
let oldChild = oldChildren[oldIndex];
// Skip items managed by ListManager in the old DOM
while (oldChild && oldChild.nodeType === Node.ELEMENT_NODE && oldChild.hasAttribute('data-ax-list-item')) {
oldIndex++;
oldChild = oldChildren[oldIndex];
}
if (!oldChild) {
// Add remaining new children
const isParentSvg =
oldNode &&
oldNode.nodeType === Node.ELEMENT_NODE &&
(oldNode.namespaceURI === 'http://www.w3.org/2000/svg' || oldNode.tagName.toLowerCase() === 'svg');
const prepared = this.#prepareNode(newChild, isParentSvg, resolveExpression, app);
oldNode.appendChild(prepared);
if (tracer.on) {
traceDomOp('insert', prepared, { into: oldNode.tagName && oldNode.tagName.toLowerCase() });
}
this.triggerEnter(prepared, resolveExpression);
} else if (this.#isSameNodeType(oldChild, newChild)) {
// Nodes are same type, patch them
if (oldChild.nodeType === Node.TEXT_NODE) {
if (oldChild.textContent !== newChild.textContent) {
const previousText = oldChild.textContent;
oldChild.textContent = newChild.textContent;
if (tracer.on) {
traceDomOp('text', oldChild, {
from: clampDomValue(previousText),
to: clampDomValue(newChild.textContent),
});
}
}
} else {
this.#patchNode(oldChild, newChild, false, false, resolveExpression, app);
}
oldIndex++;
} else {
// Nodes are different, replace
const isParentSvg =
oldNode &&
oldNode.nodeType === Node.ELEMENT_NODE &&
(oldNode.namespaceURI === 'http://www.w3.org/2000/svg' || oldNode.tagName.toLowerCase() === 'svg');
const prepared = this.#prepareNode(newChild, isParentSvg, resolveExpression, app);
const transitionName = this.getTransitionName(oldChild, resolveExpression);
if (transitionName) {
oldNode.insertBefore(prepared, oldChild);
this.triggerLeave(oldChild, resolveExpression, () => {
if (oldChild.parentNode === oldNode) {
if (tracer.on) {
traceDomOp('remove', oldChild);
}
oldNode.removeChild(oldChild);
}
}, app);
} else {
this.triggerUnmounted(oldChild, app);
if (tracer.on) {
traceDomOp('replace', oldChild, { with: prepared.nodeName && prepared.nodeName.toLowerCase() });
}
oldNode.replaceChild(prepared, oldChild);
}
this.triggerEnter(prepared, resolveExpression);
oldIndex++;
}
newIndex++;
}
// Re-sync select value after dynamic options are patched.
if (
oldNode.nodeType === Node.ELEMENT_NODE &&
oldNode.nodeName === 'SELECT' &&
newNode.nodeType === Node.ELEMENT_NODE
) {
const valueAttr = newNode.getAttribute('value');
if (valueAttr !== null && oldNode.value !== valueAttr) {
oldNode.value = valueAttr;
}
}
// Remove remaining old children (that are not managed by ListManager)
while (oldIndex < oldChildren.length) {
const oldChild = oldChildren[oldIndex];
if (!(oldChild.nodeType === Node.ELEMENT_NODE && oldChild.hasAttribute('data-ax-list-item'))) {
this.triggerLeave(oldChild, resolveExpression, () => {
if (oldChild.parentNode === oldNode) {
if (tracer.on) {
traceDomOp('remove', oldChild);
}
oldNode.removeChild(oldChild);
}
}, app);
}
oldIndex++;
}
}
/**
* Checks if two nodes are of the same type and name.
* @param {Node} nodeA
* @param {Node} nodeB
* @private
*/
#isSameNodeType(nodeA, nodeB) {
return nodeA.nodeType === nodeB.nodeType && nodeA.nodeName === nodeB.nodeName;
}
/**
* Syncs attributes from newNode to oldNode.
* @param {Element} oldNode
* @param {Element} newNode
* @private
*/
#patchAttributes(oldNode, newNode) {
const oldAttrs = oldNode.attributes;
const newAttrs = newNode.attributes;
// Track dynamic attribute names for clean attribute removal when dynamic attribute names change
const newDynAttrStr = newNode.getAttribute ? newNode.getAttribute('data-ax-dyn-attrs') : null;
const newDynAttrs = newDynAttrStr !== null ? newDynAttrStr.split(',').filter(Boolean) : null;
let prevDynAttrs = oldNode.__avenxDynAttrs || [];
if (oldNode.getAttribute && oldNode.hasAttribute('data-ax-dyn-attrs')) {
const attrVal = oldNode.getAttribute('data-ax-dyn-attrs');
const fromAttr = attrVal ? attrVal.split(',').filter(Boolean) : [];
prevDynAttrs = Array.from(new Set([...prevDynAttrs, ...fromAttr]));
}
if (newDynAttrs !== null) {
for (const oldDynName of prevDynAttrs) {
if (!newDynAttrs.includes(oldDynName)) {
if (oldNode.hasAttribute(oldDynName)) {
oldNode.removeAttribute(oldDynName);
if (isBooleanAttribute(oldDynName)) {
oldNode[oldDynName] = false;
}
}
}
}
oldNode.__avenxDynAttrs = newDynAttrs;
}
// Remove old attributes that are gone
for (let i = oldAttrs.length - 1; i >= 0; i--) {
const attr = oldAttrs[i];
if (!newNode.hasAttribute(attr.name)) {
oldNode.removeAttribute(attr.name);
if (tracer.on) {
traceDomOp('remove-attr', oldNode, { name: attr.name, from: clampDomValue(attr.value) });
}
if (isBooleanAttribute(attr.name)) {
oldNode[attr.name] = false;
}
if (attr.name === 'value' && ['INPUT', 'TEXTAREA', 'SELECT'].includes(oldNode.nodeName)) {
oldNode.value = '';
}
}
}
// Add or update attributes
for (let i = 0; i < newAttrs.length; i++) {
const attr = newAttrs[i];
const isBoolean = isBooleanAttribute(attr.name);
if (isBoolean) {
const isFalsy = attr.value === 'false' || attr.value === null || attr.value === undefined;
if (isFalsy) {
if (oldNode.hasAttribute(attr.name)) {
oldNode.removeAttribute(attr.name);
}
oldNode[attr.name] = false;
} else {
if (oldNode.getAttribute(attr.name) !== attr.value) {
const previous = oldNode.getAttribute(attr.name);
oldNode.setAttribute(attr.name, sanitizeUrlAttribute(attr.name, attr.value));
if (tracer.on) {
traceDomOp('attr', oldNode, {
name: attr.name,
from: clampDomValue(previous),
to: clampDomValue(attr.value),
});
}
}
oldNode[attr.name] = true;
}
} else {
const oldValue = oldNode.getAttribute(attr.name);
const shouldUpdate =
attr.name === 'class' ? !classTokensEqual(oldValue, attr.value) : oldValue !== attr.value;
if (shouldUpdate) {
// Escaping made the value safe *as an attribute*; only the scheme
// check makes it safe as a URL. See lib/core/security/urlPolicy.js.
oldNode.setAttribute(attr.name, sanitizeUrlAttribute(attr.name, attr.value));
if (tracer.on) {
traceDomOp('attr', oldNode, {
name: attr.name,
from: clampDomValue(oldValue),
to: clampDomValue(attr.value),
});
}
}
if (attr.name === 'value' && ['INPUT', 'TEXTAREA', 'SELECT'].includes(oldNode.nodeName)) {
if (oldNode.value !== attr.value) {
oldNode.value = attr.value;
}
}
}
}
}
/**
* Cleans an element by removing boolean attributes that evaluate to false.
* @param {Element} element - The element to clean.
* @returns {Element} The cleaned element.
*/
cleanElement(element) {
if (element && element.nodeType === Node.ELEMENT_NODE) {
this.flattenTransitionTags(element);
this.#cleanBooleanAttributes(element);
}
return element;
}
/**
* Recursively finds and cleans boolean attributes that evaluate to false in a subtree.
* @param {Element} element - The root element to clean.
* @private
*/
#cleanBooleanAttributes(element) {
const elements = [element, ...element.querySelectorAll('*')];
for (const el of elements) {
const attrs = Array.from(el.attributes);
for (const attr of attrs) {
if (isBooleanAttribute(attr.name)) {
const isFalsy = attr.value === 'false' || attr.value === null || attr.value === undefined;
if (isFalsy) {
el.removeAttribute(attr.name);
el[attr.name] = false;
} else {
el[attr.name] = true;
}
}
}
}
}
/**
* Cleans boolean attributes of a single element in-place.
* @param {Element} el
* @private
*/
#cleanBooleanAttributesForNode(el) {
const attrs = Array.from(el.attributes);
for (const attr of attrs) {
if (isBooleanAttribute(attr.name)) {
const isFalsy = attr.value === 'false' || attr.value === null || attr.value === undefined;
if (isFalsy) {
el.removeAttribute(attr.name);
el[attr.name] = false;
} else {
el[attr.name] = true;
}
}
}
}
/**
* Prepares a node for insertion into the DOM by cleaning its boolean attributes
* and ensuring correct namespaces for SVG elements.
* If a node already has the correct namespace, it is prepared in-place without cloning.
* @param {Node} node - The node to prepare.
* @param {boolean} [isSvg] - Whether the node is within an SVG context.
* @param {function(string): any} [resolveExpression] - Function to evaluate expressions.
* @param {object} [app] - The application context.
* @returns {Node} The prepared node.
* @private
*/
#prepareNode(node, isSvg = false, resolveExpression, app) {
if (node.nodeType === Node.ELEMENT_NODE) {
const tagName = node.tagName.toLowerCase();
if (tagName === 'template' || tagName === '@for') {
return node;
}
const currentIsSvg = isSvg || tagName === 'svg';
let skipChildren = false;
if (resolveExpression) {
skipChildren = this.#applyDirectives(node, resolveExpression, app);
}
if (currentIsSvg) {
if (node.namespaceURI === 'http://www.w3.org/2000/svg') {
this.#cleanBooleanAttributesForNode(node);
if (!skipChildren) {
const children = Array.from(node.childNodes);
for (const child of children) {
this.#prepareNode(child, currentIsSvg, resolveExpression, app);
}
}
return node;
} else {
const svgElement = document.createElementNS('http://www.w3.org/2000/svg', tagName);
const attrs = node.attributes;
if (attrs) {
for (let i = 0; i < attrs.length; i++) {
const attr = attrs[i];
const isBoolean = isBooleanAttribute(attr.name);
const isFalsy = attr.value === 'false' || attr.value === null || attr.value === undefined;
if (isBoolean && isFalsy) {
svgElement[attr.name] = false;
} else {
svgElement.setAttribute(attr.name, sanitizeUrlAttribute(attr.name, attr.value));
if (isBoolean) {
svgElement[attr.name] = true;
}
}
}
}
if (resolveExpression) {
this.#applyDirectives(svgElement, resolveExpression, app);
}
if (!skipChildren) {
const children = Array.from(node.childNodes);
for (const child of children) {
svgElement.appendChild(this.#prepareNode(child, currentIsSvg, resolveExpression, app));
}
}
return svgElement;
}
} else {
this.#cleanBooleanAttributesForNode(node);
if (!skipChildren) {
const children = Array.from(node.childNodes);
for (const child of children) {
this.#prepareNode(child, false, resolveExpression, app);
}
}
return node;
}
}
return node;
}
/**
* Resolves the scope an element's bindings belong to.
*
* A scoped slot was the first thing to need this; a `<@for>` row needs
* exactly the same answer, so the walk lives in one module now and both stamp
* through it.
* @param {Element} el - The element a binding is attached to.
* @returns {object|null} The nearest enclosing derived scope, or null.
* @private
*/
#getSlotScope(el) {
return findScope(el);
}
/**
* Evaluates and applies directives on a single element.
* @param {Element} el - The element to evaluate directives on.
* @param {function(string): any} resolveExpression - The expression evaluator.
* @param {object} [app] - The application context.
* @returns {boolean} Whether children evaluation/diffing should be skipped.
* @private
*/
#applyDirectives(el, resolveExpression, app) {
if (!resolveExpression || el.nodeType !== Node.ELEMENT_NODE) {
return false;
}
const slotScope = this.#getSlotScope(el);
const localResolve = slotScope ? (expr) => resolveExpression(expr, slotScope) : resolveExpression;
let skipChildren = false;
// 1. data-ax-html
if (el.hasAttribute('data-ax-html')) {
const expr = el.getAttribute('data-ax-html');
try {
const value = localResolve(expr);
let resolvedHtml = '';
if (value instanceof SafeHtml) {
resolvedHtml = value.toString();
} else if (value == null) {
resolvedHtml = '';
} else {
resolvedHtml = escaper.escape(value);
}
if (el.innerHTML !== resolvedHtml) {
el.innerHTML = resolvedHtml;
}
skipChildren = true;
} catch (err) {
logger.warn(
formatMessage(AvenxErrorCodes.DIRECTIVE_HTML_EVALUATION_FAILED, expr, err.message || err)
);
}
}
// 2. data-ax-show
if (el.hasAttribute('data-ax-show')) {
const expr = el.getAttribute('data-ax-show');
try {
const value = !!localResolve(expr);
const hasOriginal = typeof el.__originalDisplay !== 'undefined';
if (!hasOriginal) {
el.__originalDisplay = el.style.display || '';
}
const isCurrentlyVisible = el.style.display !== 'none';
if (!el.axShowInitialized) {
el.style.display = value ? el.__originalDisplay : 'none';
el.axShowInitialized = true;
} else if (value !== isCurrentlyVisible) {
const transitionName = this.getTransitionName(el, resolveExpression);
if (transitionName) {
if (value) {
el.style.display = el.__originalDisplay;
this.enter(el, transitionName);
} else {
this.leave(el, transitionName, () => {
el.style.display = 'none';
});
}
} else {
el.style.display = value ? el.__originalDisplay : 'none';
}
}
} catch (err) {
logger.warn(
formatMessage(AvenxErrorCodes.DIRECTIVE_SHOW_EVALUATION_FAILED, expr, err.message || err)
);
}
}
// 3. data-ax-class
if (el.hasAttribute('data-ax-class')) {
const expr = el.getAttribute('data-ax-class');
try {
const value = localResolve(expr);
// Clean up classes added by previous data-ax-class evaluation
if (el.__lastAxClasses) {
for (const cls of el.__lastAxClasses) {
el.classList.remove(cls);
}
}
const newClasses = [];
if (typeof value === 'string') {
newClasses.push(...value.split(/\s+/).filter(Boolean));
} else if (value && typeof value === 'object') {
for (const [cls, enabled] of Object.entries(value)) {
if (enabled) {
newClasses.push(cls);
}
}
}
for (const cls of newClasses) {
el.classList.add(cls);
}
el.__lastAxClasses = newClasses;
} catch (err) {
logger.warn(
formatMessage(AvenxErrorCodes.DIRECTIVE_CLASS_EVALUATION_FAILED, expr, err.message || err)
);
}
}
// 4. Dynamic Attribute Name Binding (:[attrName]="attrValue")
const elAttrs = Array.from(el.attributes || []);
const currentDynAttrs = [];
for (const attr of elAttrs) {
const match = attr.name.match(/^:\[(.*)\]$/);
if (match) {
const nameExpr = match[1];
const valExpr = attr.value;
let resolvedName = null;
try {
resolvedName = localResolve(nameExpr);
} catch (err) {
logger.warn(`Failed to evaluate dynamic attribute name expression "${nameExpr}": ${err.message || err}`);
}
if (resolvedName != null && String(resolvedName).trim() !== '') {
const attrName = String(resolvedName).trim();
// A dynamic name (:[expr]) that resolves to an on* handler would set
// an inline handler from a value -- the one on* path the build cannot
// see. Refuse it, matching the compiled path's AVX_C28.
if (isEventHandlerAttribute(attrName)) {
logger.warn(formatMessage(AvenxErrorCodes.SECURITY_BLOCKED_EVENT_ATTRIBUTE, attrName));
continue;
}
let resolvedVal = null;
if (valExpr) {
try {
resolvedVal = localResolve(valExpr);
} catch (err) {
logger.warn(`Failed to evaluate dynamic attribute value expression "${valExpr}": ${err.message || err}`);
}
}
if (resolvedVal !== false && resolvedVal != null) {
currentDynAttrs.push(attrName);
if (resolvedVal === true) {
el.setAttribute(attrName, 'true');
if (isBooleanAttribute(attrName)) {
el[attrName] = true;
}
} else {
el.setAttribute(attrName, sanitizeUrlAttribute(attrName, String(resolvedVal)));
}
} else {
currentDynAttrs.push(attrName);
if (el.hasAttribute(attrName)) {
el.removeAttribute(attrName);
if (isBooleanAttribute(attrName)) {
el[attrName] = false;
}
}
}
}
el.removeAttribute(attr.name);
}
}
const prevDynAttrs = el.__avenxDynAttrs || [];
for (const oldName of prevDynAttrs) {
if (!currentDynAttrs.includes(oldName)) {
if (el.hasAttribute(oldName)) {
el.removeAttribute(oldName);
if (isBooleanAttribute(oldName)) {
el[oldName] = false;
}
}
}
}
if (currentDynAttrs.length > 0 || prevDynAttrs.length > 0) {
el.__avenxDynAttrs = currentDynAttrs;
}
// 5. Custom Directives
if (app && app.directives) {
const attrs = Array.from(el.attributes || []);
for (const attr of attrs) {
if (attr.name.startsWith('data-ax-')) {
// Split dot-notation modifiers off the directive name, mirroring the
// event modifier convention in core/events/bindEvents.js.
const attrKey = attr.name.slice(8);
const parts = attrKey.split('.');
const dirName = parts[0];
// Ignore built-in core directives
if (
dirName === 'show' ||
dirName === 'class' ||
dirName === 'html' ||
dirName === 'static' ||
dirName === 'transition' ||
dirName === 'for' ||
dirName === 'as' ||
dirName === 'key' ||
dirName === 'list-item' ||
dirName === 'key-val' ||
dirName === 'validate' ||
dirName === 'validate-messages'
) {
continue;
}
if (app.directives.has(dirName)) {
const expr = attr.value;
let value;
if (expr) {
try {
value = localResolve(expr);
} catch (err) {
logger.warn(
`Failed to evaluate custom directive ${dirName} expression "${expr}": ${err.message || err}`
);
}
}
if (!el.__avenx_directives) {
el.__avenx_directives = new Map();
}
// Keyed by the full attribute suffix so that two modifier variants of
// the same directive on one element do not overwrite each other.
const oldInfo = el.__avenx_directives.get(attrKey);
if (!oldInfo) {
const modifiers = {};
for (let i = 1; i < parts.length; i++) {
if (parts[i]) modifiers[parts[i]] = true;
}
el.__avenx_directives.set(attrKey, {
name: dirName,
value,
oldValue: undefined,
expression: expr,
modifiers,
mountedCalled: false,
valueChanged: false,
});
} else {
const oldValue = oldInfo.value;
if (value !== oldValue) {
oldInfo.oldValue = oldValue;
oldInfo.value = value;
oldInfo.expression = expr;
oldInfo.valueChanged = true;
} else {
// The directive value has not changed.
// Make sure a previous update flag cannot trigger
// another updated() lifecycle call.
oldInfo.valueChanged = false;
}
}
if (this.sessionElements) {
this.sessionElements.add(el);
}
}
}
}
}
return skipChildren;
}
/**
* Recursively applies custom directives to an element and its children.
* @param {Element} element - The element tree root.
* @param {function(string): any} resolveExpression - The expression evaluator.
* @param {object} [app] - The application context.
*/
applyDirectives(element, resolveExpression, app) {
const prevSession = this.sessionElements;
const prevRoot = this.patchRoot;
this.sessionElements = new Set();
this.patchRoot = element;
try {
this.applyDirectivesInternal(element, resolveExpression, app);
this.flushLifecycleHooks(app);
} finally {
this.sessionElements = prevSession;
this.patchRoot = prevRoot;
}
}
/**
* Recursively applies directives to an element and its children.
* @param {Element} element - The target element.
* @param {Function} resolveExpression - Expression resolver callback.
* @param {object} [app] - The application context.
*/
applyDirectivesInternal(element, resolveExpression, app) {
const skip = this.#applyDirectives(element, resolveExpression, app);
if (!skip) {
const children = Array.from(element.childNodes);
for (const child of children) {
if (child.nodeType === Node.ELEMENT_NODE) {
this.applyDirectivesInternal(child, resolveExpression, app);
}
}
}
}
/**
* Applies the enter transition classes and triggers animation/transition.
* @param {Element} el - The element to animate.
* @param {string} transitionName - The transition name (e.g. 'fade').
*/
enter(el, transitionName) {
if (el.nodeType !== Node.ELEMENT_NODE) return;
const name = transitionName || 'ax';
const enterClass = `${name}-enter`;
const enterActiveClass = `${name}-enter-active`;
const enterToClass = `${name}-enter-to`;
if (el._cleanupTransition) {
el._cleanupTransition();
}
el.classList.add(enterClass);
el.classList.add(enterActiveClass);
let resolved = false;
let timeoutId = null;
const done = () => {
if (resolved) return;
resolved = true;
el.classList.remove(enterActiveClass);
el.classList.remove(enterToClass);
el.removeEventListener('transitionend', done);
el.removeEventListener('animationend', done);
if (timeoutId) clearTimeout(timeoutId);
delete el._cleanupTransition;
};
el._cleanupTransition = done;
el.addEventListener('transitionend', done);
el.addEventListener('animationend', done);
requestAnimationFrame(() => {
requestAnimationFrame(() => {
if (resolved) return;
el.classList.remove(enterClass);
el.classList.add(enterToClass);
const duration = getTransitionDuration(el);
if (duration === 0) {
done();
} else {
timeoutId = setTimeout(done, duration + 50);
}
});
});
}
/**
* Applies the leave transition classes, triggers animation, and cleans up when complete.
* @param {Element} el - The element to animate.
* @param {string} transitionName - The transition name (e.g. 'fade').
* @param {function(): void} removeCallback - Callback invoked when the leave transition completes.
*/
leave(el, transitionName, removeCallback) {
if (el.nodeType !== Node.ELEMENT_NODE) {
if (removeCallback) removeCallback();
return;
}
const name = transitionName || 'ax';
const leaveClass = `${name}-leave`;
const leaveActiveClass = `${name}-leave-active`;
const leaveToClass = `${name}-leave-to`;
if (el._cleanupTransition) {
el._cleanupTransition();
}
el._isLeaving = true;
el.classList.add(leaveClass);
el.classList.add(leaveActiveClass);
let resolved = false;
let timeoutId = null;
const done = () => {
if (resolved) return;
resolved = true;
el.classList.remove(leaveActiveClass);
el.classList.remove(leaveToClass);
el.removeEventListener('transitionend', done);
el.removeEventListener('animationend', done);
if (timeoutId) clearTimeout(timeoutId);
delete el._cleanupTransition;
delete el._isLeaving;
if (removeCallback) removeCallback();
};
el._cleanupTransition = done;
el.addEventListener('transitionend', done);
el.addEventListener('animationend', done);
requestAnimationFrame(() => {
requestAnimationFrame(() => {
if (resolved) return;
el.classList.remove(leaveClass);
el.classList.add(leaveToClass);
const duration = getTransitionDuration(el);
if (duration === 0) {
done();
} else {
timeoutId = setTimeout(done, duration + 50);
}
});
});
}
/**
* Resolves the transition name for an element.
* @param {Element} el - The element.
* @param {function(string): any} [resolveExpression] - The expression evaluator.
* @returns {string|null} The resolved transition name, or null.
*/
getTransitionName(el, resolveExpression) {
if (!el || el.nodeType !== Node.ELEMENT_NODE) return null;
if (!el.hasAttribute('data-ax-transition')) return null;
const expr = el.getAttribute('data-ax-transition');
if (!expr) return 'ax';
if (!resolveExpression) return expr;
const slotScope = this.#getSlotScope(el);
const localResolve = slotScope ? (e) => resolveExpression(e, slotScope) : resolveExpression;
try {
const val = localResolve(expr);
return typeof val === 'string' ? val : expr;
} catch {
return expr;
}
}
/**
* Triggers the enter transition if transition configurations are present.
* @param {Element} el - The element.
* @param {function(string): any} [resolveExpression] - The expression evaluator.
*/
triggerEnter(el, resolveExpression) {
if (el.nodeType !== Node.ELEMENT_NODE) return;
const transitionName = this.getTransitionName(el, resolveExpression);
if (transitionName) {
el._transitionName = transitionName;
this.enter(el, transitionName);
}
}
/**
* Triggers the leave transition or asynchronous unmounting of an element.
* @param {Element} el - The element leaving.
* @param {Function} resolveExpression - Expression evaluator callback.
* @param {Function} removeCallback - Callback to remove element from DOM.
* @param {object} [app] - The application context.
*/
triggerLeave(el, resolveExpression, removeCallback, app) {
if (el.nodeType !== Node.ELEMENT_NODE) {
if (removeCallback) removeCallback();
return;
}
const compInstance = el.__avenx_comp_instance;
const proceedWithRemoval = () => {
const done = () => {
this.triggerUnmounted(el, app);
if (removeCallback) removeCallback();
};
const transitionName = el._transitionName || this.getTransitionName(el, resolveExpression);
if (transitionName) {
this.leave(el, transitionName, done);
} else {
done();
}
};
if (compInstance && typeof compInstance.unmount === 'function') {
const unmountResult = compInstance.unmount();
if (unmountResult instanceof Promise) {
unmountResult.then(proceedWithRemoval);
return;
}
}
proceedWithRemoval();
}
/**
* Flattens <transition> elements inside a root element.
* @param {Element} node - The root element.
*/
flattenTransitionTags(node) {
if (!node || node.nodeType !== Node.ELEMENT_NODE) return;
const transitions = Array.from(node.querySelectorAll('transition'));
for (const trans of transitions) {
const nameAttr = trans.getAttribute('name');
let transitionValue = 'ax';
if (nameAttr) {
if (nameAttr.startsWith('{{') && nameAttr.endsWith('}}')) {
transitionValue = nameAttr.slice(2, -2).trim();
} else {
transitionValue = nameAttr;
}
}
const children = Array.from(trans.childNodes);
for (const child of children) {
if (child.nodeType === Node.ELEMENT_NODE) {
child.setAttribute('data-ax-transition', transitionValue);
}
trans.parentNode.insertBefore(child, trans);
}
trans.parentNode.removeChild(trans);
}
}
/**
* Checks if a node is in the currently patched DOM tree.
* @param {Element} el
* @returns {boolean}
*/
isNodeInPatchTree(el) {
if (!this.patchRoot) return false;
let curr = el;
while (curr) {
if (curr === this.patchRoot) return true;
curr = curr.parentNode || (curr.host && curr.host.nodeType === 1 ? curr.host : null);
}
return false;
}
/**
* Triggers the unmounted hook recursively on a node and its descendants.
* @param {Node} node
* @param {object} app
*/
triggerUnmounted(node, app) {
if (!node || node.nodeType !== Node.ELEMENT_NODE) return;
const descendants = Array.from(node.querySelectorAll('*'));
for (const desc of descendants) {
this.triggerUnmountedForElement(desc, app);
}
this.triggerUnmountedForElement(node, app);
}
/**
* Triggers the unmounted hook on a single element.
* @param {Element} el
* @param {object} app
*/
triggerUnmountedForElement(el, app) {
if (el.__avenx_directives) {
for (const [dirName, info] of el.__avenx_directives.entries()) {
if (info.mountedCalled) {
const dirDef = app && app.directives && app.directives.get(info.name);
if (dirDef && typeof dirDef.unmounted === 'function') {
try {
dirDef.unmounted(el, {
value: info.value,
oldValue: info.value,
expression: info.expression,
modifiers: info.modifiers,
});
} catch (err) {
logger.warn(`Error in unmounted hook of directive ${dirName}: ${err.message || err}`);
}
}
info.mountedCalled = false;
}
}
}
}
/**
* Flushes all lifecycle hooks collected during the patch session.
* @param {object} app
*/
flushLifecycleHooks(app) {
if (!this.sessionElements || !app) return;
for (const el of this.sessionElements) {
if (!el.__avenx_directives) continue;
const isConnected = this.isNodeInPatchTree(el);
if (isConnected) {
for (const [dirName, info] of el.__avenx_directives.entries()) {
const dirDef = app.directives.get(info.name);
if (!dirDef) continue;
if (!info.mountedCalled) {
if (typeof dirDef.mounted === 'function') {
try {
dirDef.mounted(el, {
value: info.value,
expression: info.expression,
modifiers: info.modifiers,
});
} catch (err) {
logger.error(`Error in mounted hook of directive ${dirName}: ${err.message || err}`);
}
}
info.mountedCalled = true;
} else if (info.valueChanged) {
if (typeof dirDef.updated === 'function') {
try {
dirDef.updated(el, {
value: info.value,
oldValue: info.oldValue,
expression: info.expression,
modifiers: info.modifiers,
});
} catch (err) {
logger.error(`Error in updated hook of directive ${dirName}: ${err.message || err}`);
}
}
info.valueChanged = false;
}
}
} else {
this.triggerUnmounted(el, app);
}
}
}
}
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