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* Virtual node helpers shared by hydration, mismatch detection and patching.
*
* A component's children are not a list of DOM nodes: they may contain null,
* booleans, nested arrays, function components and adjacent strings that the
* server merges into one text node. Everything that walks the virtual tree
* next to the DOM must first reduce children to what the server actually
* emitted, or indexes drift — a `null` before a button binds that button's
* handler to the next element.
*
* @module @coherent.js/client/hydration/vnode
*/
/** Elements the server renders without content or a closing tag. */
export const VOID_ELEMENTS = new Set([
'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input',
'link', 'meta', 'param', 'source', 'track', 'wbr',
]);
/**
* Content marked with core's dangerouslySetInnerContent(), emitted verbatim.
* @param {*} value
* @returns {boolean}
*/
export function isTrustedContent(value) {
// Same brand core's dangerouslySetInnerContent() sets: plain objects with
// __trusted/__html keys (e.g. from JSON) are not trusted.
return Boolean(value) &&
typeof value === 'object' &&
value[Symbol.for('coherent.js.trustedContent')] === true &&
typeof value.__html === 'string';
}
/**
* Call a function component the way core's renderer does: with no arguments,
* following returned functions.
* @returns {{ ok: boolean, value?: * }}
*/
function callFunctionComponent(fn) {
let result = fn;
for (let guard = 0; typeof result === 'function'; guard++) {
Iif (guard > 100) {
return { ok: false };
}
try {
result = result();
} catch {
// On the server a throwing component either failed the render or was
// replaced through render()'s onError; neither is reproducible here,
// so treat it as an opaque region.
return { ok: false };
}
}
return { ok: true, value: result };
}
/** What core's isCoherentObject (core/object-utils.js) accepts as a tag name. */
const TAG_NAME = /^[a-zA-Z][a-zA-Z0-9-]*$/;
/**
* Whether a value is an element virtual node (`{ tagName: props }`), as core
* decides it: a non-empty object whose keys are all tag names. Core renders
* an object with any other key (`{ my_tag: ... }`) as nothing.
* @param {*} vNode
* @returns {boolean}
*/
export function isElementVNode(vNode) {
Iif (!vNode || typeof vNode !== 'object' || Array.isArray(vNode) || isTrustedContent(vNode)) {
return false;
}
const keys = Object.keys(vNode);
return keys.length > 0 && keys.every((key) => TAG_NAME.test(key));
}
/**
* Split an element virtual node into its tag name and props, normalising the
* shorthand forms core accepts (`{ span: 'text' }`, `{ br: null }`, function
* content).
*
* Only the first key is read: an object with several keys is several sibling
* elements, which getRenderedChildren() lists one by one.
* @param {Object} vNode - Element virtual node
* @returns {{ tagName: string, props: Object }}
*/
export function readElement(vNode) {
const tagName = Object.keys(vNode)[0];
let content = vNode[tagName];
if (typeof content === 'function') {
const called = callFunctionComponent(content);
content = called.ok ? called.value : null;
}
if (content === null || content === undefined) {
return { tagName, props: {} };
}
if (typeof content !== 'object') {
return { tagName, props: { text: content } };
}
return { tagName, props: content };
}
function flatten(node, out) {
if (node === null || node === undefined || typeof node === 'boolean') {
return;
}
if (typeof node === 'string' || typeof node === 'number') {
out.push({ type: 'text', text: String(node) });
return;
}
if (Array.isArray(node)) {
for (const child of node) flatten(child, out);
return;
}
if (typeof node === 'function') {
const called = callFunctionComponent(node);
if (called.ok) flatten(called.value, out);
else Eout.push({ type: 'opaque' });
return;
}
if (isTrustedContent(node)) {
out.push({ type: 'opaque', html: node.__html });
return;
}
// A lazy() value: core renders what evaluate() returns.
if (node.__isLazy === true && typeof node.evaluate === 'function') {
const called = callFunctionComponent(() => node.evaluate());
if (called.ok) flatten(called.value, out);
else Eout.push({ type: 'opaque' });
return;
}
if (!isElementVNode(node)) {
return;
}
// Every key is an element: `{ span: ..., button: ... }` renders a span and
// then a button, as core's renderer does.
const tagNames = Object.keys(node);
for (const tagName of tagNames) {
out.push({ type: 'element', vNode: tagNames.length === 1 ? node : { [tagName]: node[tagName] } });
}
}
/**
* Evaluate an attribute value the way core's formatAttributes does: functions
* are called with no arguments (a throwing one yields '').
* @param {*} value
* @returns {*}
*/
export function resolveAttributeValue(value) {
if (typeof value !== 'function') return value;
try {
return value();
} catch {
return '';
}
}
/** Props that are content or identity, never attributes. */
const NON_ATTRIBUTE_PROPS = new Set(['children', 'text', 'html', 'key']);
/** Prop names that differ from their attribute name. */
const ATTRIBUTE_NAMES = { className: 'class', htmlFor: 'for' };
/**
* Enumerated attributes whose `false` is a value that must be written out,
* as in core's ENUMERATED_BOOLEAN_ATTRIBUTES (core/html-utils.js).
*/
const ENUMERATED_BOOLEAN_ATTRIBUTES = new Set(['spellcheck', 'draggable', 'contenteditable']);
function isEventProp(name, value) {
return name.startsWith('on') && typeof value === 'function';
}
function toKebabCase(property) {
return property.startsWith('--')
? property
: property.replace(/[A-Z]/g, (m) => `-${m.toLowerCase()}`);
}
/**
* Serialise a style object like core's formatAttributes does.
* @param {Object} style
* @returns {string}
*/
function styleToCss(style) {
return Object.entries(style)
.filter(([, value]) => value !== null && value !== undefined && value !== false)
.map(([property, value]) => `${toKebabCase(property)}: ${value}`)
.join('; ');
}
/**
* Normalise a class value like core's normalizeClassValue
* (core/html-utils.js): strings as-is, arrays flattened with falsy entries
* dropped, objects as the keys whose values are truthy (clsx-style).
* @param {*} value
* @returns {string}
*/
function normalizeClassValue(value) {
if (Array.isArray(value)) {
return value.map(normalizeClassValue).filter(Boolean).join(' ');
}
if (value && typeof value === 'object') {
return Object.keys(value).filter((name) => value[name]).join(' ');
}
if (value === null || value === undefined || value === false) return '';
return String(value);
}
/**
* The attributes a props object renders, as name → string ('' for a bare
* attribute), in the order core's formatAttributes writes them. Omitted
* names are absent.
*
* Functions are called, except `on*` handlers, which are not attributes;
* `className`/`class` arrays and objects are joined like clsx, and the two
* props together make one class attribute; style objects become
* `prop: value` declarations; `true` is a bare attribute and `false`, `null`
* and `undefined` omit it, except on `aria-*` and enumerated attributes
* (`spellcheck`, `draggable`, `contenteditable`), where booleans are the
* values "true" and "false".
*
* @param {Object} props
* @returns {Map<string, string>}
*/
export function renderedAttributes(props) {
const attributes = new Map();
// Both given: one class attribute, in `class`'s place, `className` last
const mergeClass = props.class !== undefined && props.className !== undefined;
for (const [name, raw] of Object.entries(props)) {
if (NON_ATTRIBUTE_PROPS.has(name) || isEventProp(name, raw)) continue;
if (mergeClass && name === 'className') continue;
const attrName = ATTRIBUTE_NAMES[name] ?? name;
let value = mergeClass && name === 'class'
? [raw, props.className].map((v) => normalizeClassValue(resolveAttributeValue(v))).filter(Boolean).join(' ')
: resolveAttributeValue(raw);
if (attrName === 'class' && value !== null && typeof value === 'object') {
value = normalizeClassValue(value);
}
if (
typeof value === 'boolean' &&
(attrName.startsWith('aria-') || ENUMERATED_BOOLEAN_ATTRIBUTES.has(attrName.toLowerCase()))
) {
value = String(value);
}
if (attrName === 'style' && value && typeof value === 'object') {
const css = styleToCss(value);
if (css) attributes.set('style', css);
} else if (value === true) {
attributes.set(attrName, '');
} else if (value !== false && value !== null && value !== undefined) {
attributes.set(attrName, String(value));
}
}
return attributes;
}
/**
* The children an element's server output contains, in order: element nodes,
* text nodes (adjacent strings merged, whitespace-only dropped) and opaque
* regions (raw HTML or components whose output cannot be reproduced).
*
* Null, undefined and booleans render nothing (as does `text: null`); nested
* arrays are flattened; an object with several tag keys is one element per
* key, in key order; `text` precedes `children`; an `html` prop replaces both.
* Each element entry's `vNode` has a single key.
*
* @param {string} tagName
* @param {Object} props
* @returns {Array<{type: 'element', vNode: Object}|{type: 'text', text: string}|{type: 'opaque', html?: string}>}
* an opaque region carries its `html` when it is raw HTML rather than a
* component this module cannot run
*/
export function getRenderedChildren(tagName, props) {
if (!props || VOID_ELEMENTS.has(String(tagName).toLowerCase())) {
return [];
}
// Null (or a function returning it) means "no raw HTML" / "no text" to
// core, not the string "null"
const html = resolveAttributeValue(props.html);
if (html !== undefined && html !== null) {
return [{ type: 'opaque', html: isTrustedContent(html) ? html.__html : String(html) }];
}
const text = resolveAttributeValue(props.text);
Iif (isTrustedContent(text)) {
return [{ type: 'opaque', html: text.__html }];
}
const raw = [];
if (text !== undefined && text !== null) {
raw.push({ type: 'text', text: String(text) });
}
flatten(props.children, raw);
// Merge adjacent text the way the HTML parser does.
const merged = [];
for (const item of raw) {
const last = merged[merged.length - 1];
if (item.type === 'text' && last?.type === 'text') {
last.text += item.text;
} else {
merged.push(item.type === 'text' ? { ...item } : item);
}
}
return merged.filter((item) => item.type !== 'text' || item.text.trim() !== '');
}
/**
* DOM children that correspond to rendered children: elements and text nodes
* that are not whitespace-only.
* @param {Node} element
* @returns {Node[]}
*/
export function getSignificantDOMChildren(element) {
Iif (!element || !element.childNodes) return [];
return Array.from(element.childNodes).filter((node) => {
if (node.nodeType === 1) return true;
Eif (node.nodeType === 3) {
return typeof node.textContent === 'string' && node.textContent.trim().length > 0;
}
return false;
});
}
/**
* Pair virtual children with DOM children.
*
* Without opaque regions the lists pair by position. Around opaque regions
* only the children before the first one (from the start) and after the last
* one (from the end) can be paired.
*
* @template V, D
* @param {Array<V & {type: string}>} vList
* @param {D[]} dList
* @returns {{ pairs: Array<[V, D, number]>, exact: boolean }} `exact` is false
* when opaque regions made the lengths incomparable
*/
export function alignChildren(vList, dList) {
const firstOpaque = vList.findIndex((item) => item.type === 'opaque');
const pairs = [];
if (firstOpaque === -1) {
const length = Math.min(vList.length, dList.length);
for (let i = 0; i < length; i++) pairs.push([vList[i], dList[i], i]);
return { pairs, exact: true };
}
let lastOpaque = firstOpaque;
for (let i = vList.length - 1; i > firstOpaque; i--) {
Iif (vList[i].type === 'opaque') {
lastOpaque = i;
break;
}
}
for (let i = 0; i < firstOpaque && i < dList.length; i++) {
pairs.push([vList[i], dList[i], i]);
}
const tail = vList.length - 1 - lastOpaque;
for (let k = 1; k <= tail && dList.length - k >= firstOpaque; k++) {
const vIndex = vList.length - k;
pairs.push([vList[vIndex], dList[dList.length - k], vIndex]);
}
return { pairs, exact: false };
}
/**
* Pair an element's virtual element children with its DOM element children,
* ignoring text entirely — what handler binding needs.
* @param {string} tagName
* @param {Object} props
* @param {Element} domElement
* @returns {Array<[Object, Element]>} [child vNode, DOM element] pairs
*/
export function pairElementChildren(tagName, props, domElement) {
const vElements = getRenderedChildren(tagName, props).filter((item) => item.type !== 'text');
const dElements = Array.from(domElement?.childNodes ?? []).filter((node) => node.nodeType === 1);
return alignChildren(vElements, dElements).pairs
.filter(([item]) => item.type === 'element')
.map(([item, node]) => [item.vNode, node]);
}
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