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utils.js
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utils.js
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/**
* Copyright 2019 IBM Corp. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import "/assets/marked/marked.min.js"
import {generateToC} from "./toc.js";
export function withUtils(superclass) {
class HtmlMixin extends superclass {
constructor() {
super()
this.attributeChangedHandlers = {}
}
$(selector) {
let element
if (this.shadowRoot) {
element = this.shadowRoot.querySelector(selector)
} else {
element = document.querySelector(selector)
}
if (element) {
return enhanceElement(element)
}
}
attributeChangedCallback(name, oldValue, newValue) {
const callback = this.attributeChangedHandlers[name]
if (callback) {
callback(newValue)
}
}
onAttributeChanged(attribute, callback) {
if(!this.constructor.observedAttributes || !this.constructor.observedAttributes.includes(attribute)) {
throw new Error(`Attribute '${attribute}' must be added to the list of observedAttributes`)
}
this.attributeChangedHandlers[attribute] = callback
}
bindAttribute(attribute, callback) {
if(!this.constructor.observedAttributes || !this.constructor.observedAttributes.includes(attribute)) {
throw new Error(`Attribute '${attribute}' must be added to the list of observedAttributes`)
}
this.attributeChangedHandlers[attribute] = callback
callback(this.getAttribute(attribute))
}
}
return HtmlMixin
}
function enhanceElement(element) {
element.clear = function () {
while (this.firstChild) {
this.removeChild(this.firstChild);
}
}
element.show = function () {
this.style.display = 'block'
}
element.hide = function () {
this.style.display = 'none'
}
element.enable = function () {
this.removeAttribute('disabled')
}
element.disable = function () {
this.setAttribute('disabled', '')
}
element.remove = function () {
this.parentElement.removeChild(this)
}
return element
}
export function formToJSON( elem ) {
let output = {};
new FormData( elem ).forEach(
( value, key ) => {
// Check if property already exist
if ( Object.prototype.hasOwnProperty.call( output, key ) ) {
let current = output[ key ];
if ( !Array.isArray( current ) ) {
// If it's not an array, convert it to an array.
current = output[ key ] = [ current ];
}
current.push( value ); // Add the new value to the array.
} else {
output[ key ] = value;
}
}
);
return output;
}
const tocLiteral = '[TOC]'
const generateTocLinkHref = (pageAnchor) => `javascript:document.querySelector('markdown-container').shadowRoot.getElementById('${pageAnchor}').scrollIntoView()`
export const fetchMarkdownAsHtml = async (fileName) => {
let fileContent = await (await fetch(fileName)).text()
marked.setOptions({
highlight: function(code, lang) {
try {
return hljs.highlight(lang, code).value;
} catch(e) {
return code
}
},
})
let html = marked(fileContent)
html = html.replace(/href=\"(.*?).md/g,'href=\"?$1.md')
if (fileContent.includes(tocLiteral)) {
const remainingMarkdown = fileContent.substring(fileContent.indexOf(tocLiteral))
const tocMarkdown = generateToC(remainingMarkdown, { generateTocLinkHref : generateTocLinkHref, maxLevel: 3 })
const tocHtml = marked(tocMarkdown)
html = html.replace(tocLiteral, tocHtml)
}
return html
}
export function $(selector) {
return enhanceElement(document.querySelector(selector))
}