next
Version:
The React Framework
173 lines (171 loc) • 6.8 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
0 && (module.exports = {
default: null,
isEqualNode: null
});
function _export(target, all) {
for(var name in all)Object.defineProperty(target, name, {
enumerable: true,
get: all[name]
});
}
_export(exports, {
default: function() {
return initHeadManager;
},
isEqualNode: function() {
return isEqualNode;
}
});
const _setattributesfromprops = require("./set-attributes-from-props");
function reactElementToDOM(param) {
let { type, props } = param;
const el = document.createElement(type);
(0, _setattributesfromprops.setAttributesFromProps)(el, props);
const { children, dangerouslySetInnerHTML } = props;
if (dangerouslySetInnerHTML) {
el.innerHTML = dangerouslySetInnerHTML.__html || '';
} else if (children) {
el.textContent = typeof children === 'string' ? children : Array.isArray(children) ? children.join('') : '';
}
return el;
}
function isEqualNode(oldTag, newTag) {
if (oldTag instanceof HTMLElement && newTag instanceof HTMLElement) {
const nonce = newTag.getAttribute('nonce');
// Only strip the nonce if `oldTag` has had it stripped. An element's nonce attribute will not
// be stripped if there is no content security policy response header that includes a nonce.
if (nonce && !oldTag.getAttribute('nonce')) {
const cloneTag = newTag.cloneNode(true);
cloneTag.setAttribute('nonce', '');
cloneTag.nonce = nonce;
return nonce === oldTag.nonce && oldTag.isEqualNode(cloneTag);
}
}
return oldTag.isEqualNode(newTag);
}
let updateElements;
if (process.env.__NEXT_STRICT_NEXT_HEAD) {
updateElements = (type, components)=>{
const headEl = document.querySelector('head');
if (!headEl) return;
const oldTags = new Set(headEl.querySelectorAll("" + type + "[data-next-head]"));
if (type === 'meta') {
const metaCharset = headEl.querySelector('meta[charset]');
if (metaCharset !== null) {
oldTags.add(metaCharset);
}
}
const newTags = [];
for(let i = 0; i < components.length; i++){
const component = components[i];
const newTag = reactElementToDOM(component);
newTag.setAttribute('data-next-head', '');
let isNew = true;
for (const oldTag of oldTags){
if (isEqualNode(oldTag, newTag)) {
oldTags.delete(oldTag);
isNew = false;
break;
}
}
if (isNew) {
newTags.push(newTag);
}
}
for (const oldTag of oldTags){
var _oldTag_parentNode;
(_oldTag_parentNode = oldTag.parentNode) == null ? void 0 : _oldTag_parentNode.removeChild(oldTag);
}
for (const newTag of newTags){
// meta[charset] must be first element so special case
if (newTag.tagName.toLowerCase() === 'meta' && newTag.getAttribute('charset') !== null) {
headEl.prepend(newTag);
}
headEl.appendChild(newTag);
}
};
} else {
updateElements = (type, components)=>{
const headEl = document.getElementsByTagName('head')[0];
const headCountEl = headEl.querySelector('meta[name=next-head-count]');
if (process.env.NODE_ENV !== 'production') {
if (!headCountEl) {
console.error('Warning: next-head-count is missing. https://nextjs.org/docs/messages/next-head-count-missing');
return;
}
}
const headCount = Number(headCountEl.content);
const oldTags = [];
for(let i = 0, j = headCountEl.previousElementSibling; i < headCount; i++, j = (j == null ? void 0 : j.previousElementSibling) || null){
var _j_tagName;
if ((j == null ? void 0 : (_j_tagName = j.tagName) == null ? void 0 : _j_tagName.toLowerCase()) === type) {
oldTags.push(j);
}
}
const newTags = components.map(reactElementToDOM).filter((newTag)=>{
for(let k = 0, len = oldTags.length; k < len; k++){
const oldTag = oldTags[k];
if (isEqualNode(oldTag, newTag)) {
oldTags.splice(k, 1);
return false;
}
}
return true;
});
oldTags.forEach((t)=>{
var _t_parentNode;
return (_t_parentNode = t.parentNode) == null ? void 0 : _t_parentNode.removeChild(t);
});
newTags.forEach((t)=>headEl.insertBefore(t, headCountEl));
headCountEl.content = (headCount - oldTags.length + newTags.length).toString();
};
}
function initHeadManager() {
return {
mountedInstances: new Set(),
updateHead: (head)=>{
const tags = {};
head.forEach((h)=>{
if (// If the font tag is loaded only on client navigation
// it won't be inlined. In this case revert to the original behavior
h.type === 'link' && h.props['data-optimized-fonts']) {
if (document.querySelector('style[data-href="' + h.props['data-href'] + '"]')) {
return;
} else {
h.props.href = h.props['data-href'];
h.props['data-href'] = undefined;
}
}
const components = tags[h.type] || [];
components.push(h);
tags[h.type] = components;
});
const titleComponent = tags.title ? tags.title[0] : null;
let title = '';
if (titleComponent) {
const { children } = titleComponent.props;
title = typeof children === 'string' ? children : Array.isArray(children) ? children.join('') : '';
}
if (title !== document.title) document.title = title;
[
'meta',
'base',
'link',
'style',
'script'
].forEach((type)=>{
updateElements(type, tags[type] || []);
});
}
};
}
if ((typeof exports.default === 'function' || (typeof exports.default === 'object' && exports.default !== null)) && typeof exports.default.__esModule === 'undefined') {
Object.defineProperty(exports.default, '__esModule', { value: true });
Object.assign(exports.default, exports);
module.exports = exports.default;
}
//# sourceMappingURL=head-manager.js.map