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/**
* Checks if a given DOM element belongs to the component defined by root.
* Deals with nested component boundaries and transcluded slots.
* @param {Element} element
* @param {Element} root
* @returns {boolean}
*/
function belongsToComponent(element, root) {
if (element === root) {
return !(root.hasAttribute && (root.hasAttribute('data-avenx-comp') || root.hasAttribute('data-avenx-comp-dynamic')));
}
let current = element;
let isTranscluded = false;
while (current && current !== root) {
if (current.nodeType === 1) {
if (current.nodeName === 'SLOT' && current.hasAttribute && current.hasAttribute('data-avenx-transcluded')) {
isTranscluded = true;
} else if (
current.hasAttribute &&
(current.hasAttribute('data-avenx-comp') || current.hasAttribute('data-avenx-comp-dynamic'))
) {
if (isTranscluded) {
isTranscluded = false;
} else if (current !== element) {
return false;
}
}
}
current = current.parentNode;
}
return !isTranscluded;
}
/**
* Responsible for binding event listeners to DOM elements based on attributes.
* Uses event delegation on the root element.
*/
export class EventBinder {
/**
* Stores bound events and handlers.
* @type {WeakMap<Element, Map<string, {handler: Function, options: object}>>}
* @private
*/
#boundEvents = new WeakMap();
/**
* Builds addEventListener options from OR'd passive/capture flags.
* @param {object} flags
* @returns {object}
* @private
*/
#toListenerOptions(flags) {
const options = {};
if (flags && flags.passive) options.passive = true;
if (flags && flags.capture) options.capture = true;
return options;
}
/**
* ORs `.passive` / `.capture` modifiers into an options flags object.
* @param {{passive: boolean, capture: boolean}} flags
* @param {string[]} modifiers
* @private
*/
#orListenerFlags(flags, modifiers) {
if (modifiers.includes('passive')) flags.passive = true;
if (modifiers.includes('capture')) flags.capture = true;
}
/**
* Stores elements and executed modifier keys for once handlers.
* @type {WeakMap<Element, Set<string>>}
* @private
*/
#onceExecuted = new WeakMap();
/**
* Reads all event handlers (including delegation metadata) from an element.
* Supports both data-ax-event and traditional @event attributes.
* @param {Element} el
* @returns {Array<{fullName: string, value: string, attrName: string}>}
* @private
*/
#getEventHandlers(el) {
const handlers = [];
if (!el) return handlers;
if (el.hasAttribute && el.hasAttribute('data-ax-event')) {
const attrVal = el.getAttribute('data-ax-event');
try {
const parsed = JSON.parse(attrVal);
for (const [key, val] of Object.entries(parsed)) {
handlers.push({
fullName: key,
value: val,
attrName: `data-ax-event:${key}`
});
}
} catch {
// Ignored
}
}
if (el.attributes) {
Array.from(el.attributes).forEach((attr) => {
if (attr.name.startsWith('@')) {
handlers.push({
fullName: attr.name.substring(1),
value: attr.value,
attrName: attr.name
});
}
});
}
return handlers;
}
/**
* Binds event listeners to all elements under the root that have attributes starting with '@'.
* Uses event delegation on Element roots, falls back to direct binding on DocumentFragments.
* @param {Element|DocumentFragment} root - The root element to bind events on.
* @param {object} dispatcher - The object responsible for executing the event handler.
* @param {function(string, Event): void} dispatcher.execute - Method to execute the event.
*/
bind(root, dispatcher) {
if (!root) return;
if (root.nodeType === 11) {
this.#bindDirect(root, dispatcher);
} else {
this.#bindDelegated(root, dispatcher);
}
}
/**
* Removes all event listeners for the given root.
* @param {Element|DocumentFragment} root
*/
unbind(root) {
if (!root) return;
if (root.nodeType === 11) {
this.#unbindDirect(root);
} else {
this.#unbindDelegated(root);
this.#unbindDirect(root);
}
}
/**
* @param {Element} root
* @param {object} dispatcher
*/
#bindDelegated(root, dispatcher) {
const COMMON_EVENTS = ['click', 'input', 'change', 'keydown'];
const eventNames = new Set(COMMON_EVENTS);
/** @type {Map<string, {passive: boolean, capture: boolean}>} */
const eventFlags = new Map();
const ensureFlags = (eventName) => {
if (!eventFlags.has(eventName)) {
eventFlags.set(eventName, { passive: false, capture: false });
}
return eventFlags.get(eventName);
};
COMMON_EVENTS.forEach((name) => ensureFlags(name));
const traverse = (node) => {
if (node.nodeType !== 1) return;
const handlers = this.#getEventHandlers(node);
handlers.forEach((h) => {
const parts = h.fullName.split('.');
const baseEventName = parts[0];
eventNames.add(baseEventName);
this.#orListenerFlags(ensureFlags(baseEventName), parts.slice(1));
});
if (node.nodeName === 'SLOT' && node.hasAttribute && node.hasAttribute('data-avenx-transcluded')) {
return;
}
if (
node !== root &&
node.hasAttribute &&
(node.hasAttribute('data-avenx-comp') || node.hasAttribute('data-avenx-comp-dynamic'))
) {
return;
}
const children = node.childNodes || node.children;
if (children) {
for (let i = 0; i < children.length; i++) {
traverse(children[i]);
}
}
};
traverse(root);
if (!root.__avenxDelegatedListeners) {
root.__avenxDelegatedListeners = new Map();
}
const delegatedMap = root.__avenxDelegatedListeners;
const existing = this.#boundEvents.get(root) || new Map();
eventNames.forEach((eventName) => {
if (delegatedMap.has(eventName)) {
const oldEntry = delegatedMap.get(eventName);
const oldHandler = typeof oldEntry === 'function' ? oldEntry : oldEntry.handler;
const oldOptions = typeof oldEntry === 'function' ? undefined : oldEntry.options;
if (typeof root.removeEventListener === 'function') {
root.removeEventListener(eventName, oldHandler, oldOptions);
}
delegatedMap.delete(eventName);
existing.delete(eventName);
}
const handler = (event) => {
let current = (event && event.target) || root;
while (current) {
if (belongsToComponent(current, root)) {
if (current.hasAttribute && current.hasAttribute('data-ax-validate')) {
if (dispatcher && typeof dispatcher.validate === 'function') {
dispatcher.validate(current);
}
}
const handlers = this.#getEventHandlers(current);
handlers.forEach((h) => {
const parts = h.fullName.split('.');
const baseEventName = parts[0];
if (baseEventName === eventName) {
const modifiers = parts.slice(1);
if (h.value) {
this.#executeWithModifiers(dispatcher, h.value, event, modifiers, current, h.attrName);
}
}
});
}
if (current === root) {
break;
}
current = current.parentNode;
if (event.cancelBubble) {
break;
}
}
};
const options = this.#toListenerOptions(eventFlags.get(eventName));
if (typeof root.addEventListener === 'function') {
root.addEventListener(eventName, handler, options);
}
const entry = { handler, options };
delegatedMap.set(eventName, entry);
existing.set(eventName, entry);
this.#boundEvents.set(root, existing);
});
}
/**
* @param {Element} root
*/
#unbindDelegated(root) {
if (root.__avenxDelegatedListeners) {
root.__avenxDelegatedListeners.forEach((entry, eventName) => {
const handler = typeof entry === 'function' ? entry : entry.handler;
const options = typeof entry === 'function' ? undefined : entry.options;
if (typeof root.removeEventListener === 'function') {
root.removeEventListener(eventName, handler, options);
}
});
delete root.__avenxDelegatedListeners;
}
const existing = this.#boundEvents.get(root);
if (existing) {
existing.forEach((entry, eventName) => {
const handler = typeof entry === 'function' ? entry : entry.handler;
const options = typeof entry === 'function' ? undefined : entry.options;
if (typeof root.removeEventListener === 'function') {
root.removeEventListener(eventName, handler, options);
}
});
this.#boundEvents.delete(root);
}
}
/**
* @param {Element|DocumentFragment} root
* @param {object} dispatcher
*/
#bindDirect(root, dispatcher) {
const elements = [];
const traverse = (node) => {
if (node.nodeType !== 1 && node.nodeType !== 11) return;
if (node.nodeType === 1) {
elements.push(node);
}
if (node.nodeName === 'SLOT' && node.hasAttribute && node.hasAttribute('data-avenx-transcluded')) {
return;
}
const children = node.childNodes || node.children;
if (children) {
for (let i = 0; i < children.length; i++) {
traverse(children[i]);
}
}
};
traverse(root);
elements.forEach((el) => {
if (!el.__avenxDirectListeners) {
el.__avenxDirectListeners = new Map();
}
const directMap = el.__avenxDirectListeners;
const existing = this.#boundEvents.get(el) || new Map();
const handlers = this.#getEventHandlers(el);
// Remove any existing direct listeners on el before binding new ones
directMap.forEach((oldEntry, baseEventName) => {
const oldHandler = typeof oldEntry === 'function' ? oldEntry : oldEntry.handler;
const oldOptions = typeof oldEntry === 'function' ? undefined : oldEntry.options;
if (typeof el.removeEventListener === 'function') {
el.removeEventListener(baseEventName, oldHandler, oldOptions);
}
});
directMap.clear();
existing.clear();
/** @type {Map<string, {passive: boolean, capture: boolean}>} */
const eventFlags = new Map();
handlers.forEach((h) => {
const parts = h.fullName.split('.');
const baseEventName = parts[0];
if (!eventFlags.has(baseEventName)) {
eventFlags.set(baseEventName, { passive: false, capture: false });
}
this.#orListenerFlags(eventFlags.get(baseEventName), parts.slice(1));
});
handlers.forEach((h) => {
const parts = h.fullName.split('.');
const baseEventName = parts[0];
if (!directMap.has(baseEventName)) {
const handler = (event) => {
const currentHandlers = this.#getEventHandlers(el);
currentHandlers.forEach((ch) => {
const cp = ch.fullName.split('.');
const cbEventName = cp[0];
if (cbEventName === baseEventName) {
const mods = cp.slice(1);
if (ch.value) {
this.#executeWithModifiers(dispatcher, ch.value, event, mods, el, ch.attrName);
}
}
});
};
const options = this.#toListenerOptions(eventFlags.get(baseEventName));
if (typeof el.addEventListener === 'function') {
el.addEventListener(baseEventName, handler, options);
}
const entry = { handler, options };
directMap.set(baseEventName, entry);
existing.set(baseEventName, entry);
this.#boundEvents.set(el, existing);
}
});
});
}
/**
* 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);
}
/**
* Executes the handler expression if modifiers permit, and applies modifier effects.
* @param {object} dispatcher
* @param {string} handlerExpression
* @param {Event} event
* @param {string[]} modifiers
* @param {Element} el
* @param {string} attrName
* @private
*/
#executeWithModifiers(dispatcher, handlerExpression, event, modifiers, el, attrName) {
// 0. Check self modifier
if (modifiers.includes('self')) {
if (event && event.target && event.target !== el) {
return;
}
}
// 1. Check once modifier
if (modifiers.includes('once')) {
let executedSet = this.#onceExecuted.get(el);
if (!executedSet) {
executedSet = new Set();
this.#onceExecuted.set(el, executedSet);
}
if (executedSet.has(attrName)) {
return;
}
executedSet.add(attrName);
}
// 2. Check system key modifiers
const SYSTEM_MODIFIER_MAP = {
ctrl: 'ctrlKey',
alt: 'altKey',
shift: 'shiftKey',
meta: 'metaKey',
cmd: 'metaKey',
};
const systemModifiers = modifiers.filter(m => Object.prototype.hasOwnProperty.call(SYSTEM_MODIFIER_MAP, m));
if (systemModifiers.some(mod => !event || event[SYSTEM_MODIFIER_MAP[mod]] !== true)) {
return;
}
// 3. Check key modifiers for keyboard events
const KEY_MODIFIER_MAP = {
enter: 'Enter',
esc: 'Escape',
escape: 'Escape',
space: ' ',
tab: 'Tab',
delete: 'Delete',
};
const keyModifiers = modifiers.filter(m => Object.prototype.hasOwnProperty.call(KEY_MODIFIER_MAP, m));
if (keyModifiers.length > 0) {
if (!event || typeof event.key !== 'string') {
return;
}
const matches = keyModifiers.some(mod => event.key === KEY_MODIFIER_MAP[mod]);
if (!matches) {
return;
}
}
// 4. Apply prevent & stop modifiers
// Skip preventDefault when .passive is present — browsers ignore it on passive listeners
if (
modifiers.includes('prevent') &&
!modifiers.includes('passive') &&
event &&
typeof event.preventDefault === 'function'
) {
event.preventDefault();
}
if (modifiers.includes('stop') && event && typeof event.stopPropagation === 'function') {
event.stopPropagation();
}
// 4. Execute handler
const slotScope = this.#getSlotScope(el);
dispatcher.execute(handlerExpression, event, slotScope);
}
/**
* @param {Element|DocumentFragment} root
*/
#unbindDirect(root) {
const elements = [];
const traverse = (node) => {
if (node.nodeType !== 1 && node.nodeType !== 11) return;
if (node.nodeType === 1) {
elements.push(node);
}
if (node.nodeName === 'SLOT' && node.hasAttribute && node.hasAttribute('data-avenx-transcluded')) {
return;
}
const children = node.childNodes || node.children;
if (children) {
for (let i = 0; i < children.length; i++) {
traverse(children[i]);
}
}
};
traverse(root);
elements.forEach((el) => {
if (el.__avenxDirectListeners) {
el.__avenxDirectListeners.forEach((entry, eventName) => {
const handler = typeof entry === 'function' ? entry : entry.handler;
const options = typeof entry === 'function' ? undefined : entry.options;
if (typeof el.removeEventListener === 'function') {
el.removeEventListener(eventName, handler, options);
}
});
delete el.__avenxDirectListeners;
}
const existing = this.#boundEvents.get(el);
if (existing) {
existing.forEach((entry, eventName) => {
const handler = typeof entry === 'function' ? entry : entry.handler;
const options = typeof entry === 'function' ? undefined : entry.options;
if (typeof el.removeEventListener === 'function') {
el.removeEventListener(eventName, handler, options);
}
});
this.#boundEvents.delete(el);
}
});
}
/**
* Resets internal WeakMaps to release any remaining element-handler references.
*/
teardown() {
this.#boundEvents = new WeakMap();
this.#onceExecuted = new WeakMap();
}
}
|