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wcc.js
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wcc.js
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/* eslint-disable max-depth */
// this must come first
import './dom-shim.js';
import * as acorn from 'acorn';
import * as walk from 'acorn-walk';
import { generate } from '@projectevergreen/escodegen-esm';
import { getParser, parseJsx } from './jsx-loader.js';
import { parse, parseFragment, serialize } from 'parse5';
import fs from 'fs';
function getParse(html) {
return html.indexOf('<html>') >= 0 || html.indexOf('<body>') >= 0 || html.indexOf('<head>') >= 0
? parse
: parseFragment;
}
function isCustomElementDefinitionNode(node) {
const { expression } = node;
return expression.type === 'CallExpression' && expression.callee && expression.callee.object
&& expression.callee.property && expression.callee.object.name === 'customElements'
&& expression.callee.property.name === 'define';
}
async function renderComponentRoots(tree, definitions) {
for (const node of tree.childNodes) {
if (node.tagName && node.tagName.indexOf('-') > 0) {
const { tagName } = node;
if (definitions[tagName]) {
const { moduleURL } = definitions[tagName];
const elementInstance = await initializeCustomElement(moduleURL, tagName, node.attrs, definitions);
const elementHtml = elementInstance.shadowRoot
? elementInstance.getInnerHTML({ includeShadowRoots: true })
: elementInstance.innerHTML;
const elementTree = parseFragment(elementHtml);
node.childNodes = node.childNodes.length === 0
? elementTree.childNodes
: [...elementTree.childNodes, ...node.childNodes];
} else {
console.warn(`WARNING: customElement <${tagName}> is not defined. You may not have imported it yet.`);
}
}
if (node.childNodes && node.childNodes.length > 0) {
await renderComponentRoots(node, definitions);
}
// does this only apply to `<template>` tags?
if (node.content && node.content.childNodes && node.content.childNodes.length > 0) {
await renderComponentRoots(node.content, definitions);
}
}
return tree;
}
function registerDependencies(moduleURL, definitions, depth = 0) {
const moduleContents = fs.readFileSync(moduleURL, 'utf-8');
const nextDepth = depth += 1;
const customParser = getParser(moduleURL);
const parser = customParser ? customParser.parser : acorn;
const config = customParser ? customParser.config : {
...walk.base
};
walk.simple(parser.parse(moduleContents, {
ecmaVersion: 'latest',
sourceType: 'module'
}), {
ImportDeclaration(node) {
const specifier = node.source.value;
const isBareSpecifier = specifier.indexOf('.') !== 0 && specifier.indexOf('/') !== 0;
const extension = specifier.split('.').pop();
// TODO would like to decouple .jsx from the core, ideally
if (!isBareSpecifier && ['js', 'jsx'].includes(extension)) {
const dependencyModuleURL = new URL(node.source.value, moduleURL);
registerDependencies(dependencyModuleURL, definitions, nextDepth);
}
},
ExpressionStatement(node) {
if (isCustomElementDefinitionNode(node)) {
const { arguments: args } = node.expression;
const tagName = args[0].type === 'Literal'
? args[0].value // single and double quotes
: args[0].quasis[0].value.raw; // template literal
const tree = parseJsx(moduleURL);
const isEntry = nextDepth - 1 === 1;
definitions[tagName] = {
instanceName: args[1].name,
moduleURL,
source: generate(tree),
url: moduleURL,
isEntry
};
}
}
}, config);
}
async function getTagName(moduleURL) {
const moduleContents = await fs.promises.readFile(moduleURL, 'utf-8');
const customParser = getParser(moduleURL);
const parser = customParser ? customParser.parser : acorn;
const config = customParser ? customParser.config : {
...walk.base
};
let tagName;
walk.simple(parser.parse(moduleContents, {
ecmaVersion: 'latest',
sourceType: 'module'
}), {
ExpressionStatement(node) {
if (isCustomElementDefinitionNode(node)) {
tagName = node.expression.arguments[0].value;
}
}
}, config);
return tagName;
}
async function initializeCustomElement(elementURL, tagName, attrs = [], definitions = [], isEntry, props = {}) {
if (!tagName) {
const depth = isEntry ? 1 : 0;
registerDependencies(elementURL, definitions, depth);
}
// https://github.com/ProjectEvergreen/wcc/pull/67/files#r902061804
const { pathname } = elementURL;
const element = customElements.get(tagName) ?? (await import(pathname)).default;
const dataLoader = (await import(pathname)).getData;
const data = props
? props
: dataLoader
? await dataLoader(props)
: {};
if (element) {
const elementInstance = new element(data); // eslint-disable-line new-cap
attrs.forEach((attr) => {
elementInstance.setAttribute(attr.name, attr.value);
if (attr.name === 'hydrate') {
definitions[tagName].hydrate = attr.value;
}
});
await elementInstance.connectedCallback();
return elementInstance;
}
}
async function renderToString(elementURL, wrappingEntryTag = true, props = {}) {
const definitions = [];
const elementTagName = wrappingEntryTag && await getTagName(elementURL);
const isEntry = !!elementTagName;
const elementInstance = await initializeCustomElement(elementURL, undefined, undefined, definitions, isEntry, props);
let html;
// in case the entry point isn't valid
if (elementInstance) {
const elementHtml = elementInstance.shadowRoot
? elementInstance.getInnerHTML({ includeShadowRoots: true })
: elementInstance.innerHTML;
const elementTree = getParse(elementHtml)(elementHtml);
const finalTree = await renderComponentRoots(elementTree, definitions);
html = wrappingEntryTag && elementTagName ? `
<${elementTagName}>
${serialize(finalTree)}
</${elementTagName}>
`
: serialize(finalTree);
} else {
console.warn('WARNING: No custom element class found for this entry point.');
}
return {
html,
metadata: definitions
};
}
async function renderFromHTML(html, elements = []) {
const definitions = [];
for (const url of elements) {
await initializeCustomElement(url, undefined, undefined, definitions, true);
}
const elementTree = getParse(html)(html);
const finalTree = await renderComponentRoots(elementTree, definitions);
return {
html: serialize(finalTree),
metadata: definitions
};
}
export {
renderToString,
renderFromHTML
};