84 lines
2.5 KiB
JavaScript
84 lines
2.5 KiB
JavaScript
'use strict';
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const CONSTANTS = require('./constants.js');
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const SYNC = 'sync';
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const ATTRIBUTE_PRIORITIES = [SYNC, 'async', 'defer'];
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const common = require('./common.js');
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const debug = common.debug;
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const isScript = common.isScript;
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const matches = common.matches;
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const getScriptName = common.getScriptName;
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const shouldUpdate = (options) => {
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if (ATTRIBUTE_PRIORITIES.indexOf(options.defaultAttribute) < 0) {
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throw new Error(`${CONSTANTS.PLUGIN}: invalid default attribute`);
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}
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return !(options.defaultAttribute === SYNC &&
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options.inline.test.length === 0 &&
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options.async.test.length === 0 &&
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options.defer.test.length === 0 &&
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options.module.test.length === 0);
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};
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const update = (assets, options, tags) => {
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const update = updateElement.bind(null, assets, options);
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return tags.map(update);
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};
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const updateElement = (assets, options, tag) => {
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return (isScript(tag))
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? updateScriptElement(assets, options, tag)
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: tag;
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};
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const updateScriptElement = (assets, options, tag) => {
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debug(`${CONSTANTS.EVENT}: processing <script> element: ${JSON.stringify(tag)}`);
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return (isInline(options, tag))
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? replaceWithInlineElement(assets, options, tag)
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: updateSrcElement(options, tag);
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};
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const isInline = (options, tag) =>
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matches(getScriptName(options, tag), options.inline.test);
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const replaceWithInlineElement = (assets, options, tag) => {
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const scriptName = getScriptName(options, tag);
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const asset = assets[scriptName];
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if (!asset) throw new Error(`${CONSTANTS.PLUGIN}: no asset with href '${scriptName}'`);
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const newTag = {
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tagName: 'script',
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closeTag: true,
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innerHTML: asset.source()
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};
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debug(`${CONSTANTS.PLUGIN}: replaced by: ${JSON.stringify(newTag)}`);
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return newTag;
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};
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const updateSrcElement = (options, tag) => {
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const scriptName = getScriptName(options, tag);
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// select new attribute, if any, by priority
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let newAttribute;
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ATTRIBUTE_PRIORITIES.some(attribute => {
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if (matches(scriptName, options[attribute].test)) {
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newAttribute = attribute;
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return true;
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}
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});
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if (!newAttribute) newAttribute = options.defaultAttribute;
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if (newAttribute !== SYNC) {
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tag.attributes[newAttribute] = true;
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}
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// possibly overwrite existing type attribute
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if (matches(scriptName, options.module.test)) {
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tag.attributes.type = 'module';
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}
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debug(`${CONSTANTS.PLUGIN}: updated to: ${JSON.stringify(tag)}`);
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return tag;
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};
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module.exports = {
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shouldUpdate,
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update
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};
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