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107 lines
2.5 KiB
107 lines
2.5 KiB
// @flow
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import {Transformer} from '@parcel/plugin';
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import type {AST} from '@parcel/types';
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import {parser as parse} from 'posthtml-parser';
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import nullthrows from 'nullthrows';
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import type {PostHTMLExpression, PostHTMLNode} from 'posthtml';
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import PostHTML from 'posthtml';
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import {render} from 'posthtml-render';
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import semver from 'semver';
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import collectDependencies from './dependencies';
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import extractInlineAssets from './inline';
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export default (new Transformer({
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canReuseAST({ast}) {
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return ast.type === 'posthtml' && semver.satisfies(ast.version, '^0.4.0');
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},
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async parse({asset}) {
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return {
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type: 'posthtml',
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version: '0.4.1',
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program: parse(await asset.getCode(), {
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lowerCaseTags: true,
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lowerCaseAttributeNames: true,
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sourceLocations: true,
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xmlMode: asset.type === 'xhtml',
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}),
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};
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},
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async transform({asset, options}) {
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if (asset.type === 'htm') {
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asset.type = 'html';
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}
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asset.bundleBehavior = 'isolated';
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let ast = nullthrows(await asset.getAST());
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let hasScripts = collectDependencies(asset, ast);
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const {
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assets: inlineAssets,
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hasScripts: hasInlineScripts,
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} = extractInlineAssets(asset, ast);
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const result = [asset, ...inlineAssets];
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// empty <script></script> is added to make sure HMR is working even if user
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// didn't add any.
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if (options.hmrOptions && !(hasScripts || hasInlineScripts)) {
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const script = {
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tag: 'script',
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attrs: {
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src: asset.addURLDependency('hmr.js', {
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priority: 'parallel',
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}),
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},
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content: [],
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};
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const found = findFirstMatch(ast, [{tag: 'body'}, {tag: 'html'}]);
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if (found) {
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found.content = found.content || [];
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found.content.push(script);
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} else {
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// Insert at the very end.
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ast.program.push(script);
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}
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asset.setAST(ast);
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result.push({
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type: 'js',
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content: '',
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uniqueKey: 'hmr.js',
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});
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}
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return result;
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},
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generate({ast, asset}) {
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return {
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content: render(ast.program, {
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closingSingleTag: asset.type === 'xhtml' ? 'slash' : undefined,
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}),
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};
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},
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}): Transformer);
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function findFirstMatch(
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ast: AST,
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expressions: PostHTMLExpression[],
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): ?PostHTMLNode {
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let found;
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for (const expression of expressions) {
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PostHTML().match.call(ast.program, expression, node => {
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found = node;
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return node;
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});
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if (found) {
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return found;
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}
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}
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}
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