oe-ui-misc/oe-markdown-link.js

collection of miscellaneous oe-ui Polymer components

/**
 * @license
 * ©2018-2019 EdgeVerve Systems Limited (a fully owned Infosys subsidiary),
 * Bangalore, India. All Rights Reserved.
 */
import { html, PolymerElement } from "@polymer/polymer/polymer-element.js";
import "oe-ajax/oe-ajax.js";
import "@polymer/marked-element/marked-element.js";
import { OECommonMixin } from "oe-mixins/oe-common-mixin.js";


/**
 * `oe-markdown-link` loads a mark-down file and displays as content. 
 * Uses Polymer's [marked-element](https://elements.polymer-project.org/elements/marked-element) for rendering. A wrapper is required since  [marked-element](https://elements.polymer-project.org/elements/marked-element) does not allow specifying a url.
 *
 * @customElement
 * @polymer
 * @appliesMixin OECommonMixin
 * @demo demo/demo-oe-markdown-link.html
 * 
 */
class OeMarkDownLink extends OECommonMixin(PolymerElement) {
  static get is() {
    return 'oe-markdown-link';
  }
  static get template() {
    return html`
    <style>
    .markdown-html {
      -ms-text-size-adjust: 100%;
      -webkit-text-size-adjust: 100%;
      color: var(--primary-text-color);
      font-size: 18px;
      line-height: 1.2;
      word-wrap: break-word;
      font-weight: 400;
    }
    .markdown-html table {
      font-weight: 400;
    }
    .markdown-html a {
      background: transparent;
    }

    .markdown-html a:active,
    .markdown-html a:hover {
      outline: 0;
    }
    .markdown-html strong {
      font-weight: bold;
    }

    .markdown-html h1 {
      font-size: 2em;
      margin: 0.67em 0;
    }

    .markdown-html img {
      border: 0;
    }

    .markdown-html hr {
      -moz-box-sizing: content-box;
      box-sizing: content-box;
      height: 0;
    }

    .markdown-html pre {
      overflow: auto;
    }
    .markdown-html code,
      .markdown-html kbd,
      .markdown-html pre {
        font-size: 1em;
      }

      .markdown-html input {
        color: inherit;
        font: inherit;
        margin: 0;
      }

      .markdown-html html input[disabled] {
        cursor: default;
      }

      .markdown-html input {
        line-height: normal;
      }

      .markdown-html input[type="checkbox"] {
        -moz-box-sizing: border-box;
        box-sizing: border-box;
        padding: 0;
      }
      .markdown-html table {
        border-collapse: collapse;
        border-spacing: 0;
      }

      .markdown-html td,
      .markdown-html th {
        padding: 0;
        line-height: 22px;
      }

      .markdown-html * {
        -moz-box-sizing: border-box;
        box-sizing: border-box;
      }

      .markdown-html input {
        font: "SansPro-Regular";
      }

      .markdown-html a {
        color: #4183c4;
        text-decoration: none;
      }

      .markdown-html a:hover,
      .markdown-html a:focus,
      .markdown-html a:active {
        text-decoration: underline;
      }

      .markdown-html hr {
        height: 0;
        margin: 15px 0;
        overflow: hidden;
        background: transparent;
        border: 0;
        border-bottom: 1px solid #ddd;
      }
      .markdown-html hr::before {
        display: table;
        content: "";
      }
      .markdown-html hr::after {
        display: table;
        clear: both;
        content: "";
      }
      .markdown-html h1,
      .markdown-html h2,
      .markdown-html h3,
      .markdown-html h4,
      .markdown-html h5,
      .markdown-html h6 {
        margin-top: 15px;
        margin-bottom: 15px;
        line-height: 1.1;
        font-weight: normal;
      }
      .markdown-html h1 {
        font-size: 30px;
      }

      .markdown-html h2 {
        font-size: 21px;
      }

      .markdown-html h3 {
        font-size: 16px;
      }

      .markdown-html h4 {
        font-size: 14px;
      }

      .markdown-html h5 {
        font-size: 12px;
      }

      .markdown-html h6 {
        font-size: 11px;
      }
      .markdown-html blockquote {
        margin: 0;
      }

      .markdown-html ul,
      .markdown-html ol {
        padding: 0;
        margin-top: 0;
        margin-bottom: 0;
      }

      .markdown-html ol ol,
      .markdown-html ul ol {
        list-style-type: lower-roman;
      }

      .markdown-html ul ul ol,
      .markdown-html ul ol ol,
      .markdown-html ol ul ol,
      .markdown-html ol ol ol {
        list-style-type: lower-alpha;
      }

      .markdown-html dd {
        margin-left: 0;
      }
      .markdown-html code {
        font: 12px Consolas, "Liberation Mono", Menlo, Courier, "SansPro-Regular";
      }

      .markdown-html pre {
        margin-top: 0;
        margin-bottom: 0;
        font: 12px Consolas, "Liberation Mono", Menlo, Courier, "SansPro-Regular";
      }

      .markdown-html .octicon {
        font: normal normal 16px octicons-anchor;
        line-height: 1;
        display: inline-block;
        text-decoration: none;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
      }
      .markdown-html .octicon-link::before {
        content: '\f05c';
      }
      .markdown-html > *:first-child {
        margin-top: 0 !important;
      }

      .markdown-html > *:last-child {
        margin-bottom: 0 !important;
      }

      .markdown-html .anchor {
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        display: block;
        padding-right: 6px;
        padding-left: 30px;
        margin-left: -30px;
      }
      .markdown-html .anchor:focus {
        outline: none;
      }

      .markdown-html h1,
      .markdown-html h2,
      .markdown-html h3,
      .markdown-html h4,
      .markdown-html h5,
      .markdown-html h6 {
        position: relative;
        margin-top: 1em;
        margin-bottom: 16px;
        font-weight: normal;
        line-height: 1.4;
      }

      .markdown-html h1 .octicon-link,
      .markdown-html h2 .octicon-link,
      .markdown-html h3 .octicon-link,
      .markdown-html h4 .octicon-link,
      .markdown-html h5 .octicon-link,
      .markdown-html h6 .octicon-link {
        display: none;
        color: #000;
        vertical-align: middle;
      }
      .markdown-html h1:hover .anchor,
      .markdown-html h2:hover .anchor,
      .markdown-html h3:hover .anchor,
      .markdown-html h4:hover .anchor,
      .markdown-html h5:hover .anchor,
      .markdown-html h6:hover .anchor {
        padding-left: 8px;
        margin-left: -30px;
        line-height: 1;
        text-decoration: none;
      }

      .markdown-html h1:hover .anchor .octicon-link,
      .markdown-html h2:hover .anchor .octicon-link,
      .markdown-html h3:hover .anchor .octicon-link,
      .markdown-html h4:hover .anchor .octicon-link,
      .markdown-html h5:hover .anchor .octicon-link,
      .markdown-html h6:hover .anchor .octicon-link {
        display: inline-block;
      }
      .markdown-html h1 {
        padding-bottom: 0.3em;
        font-size: 2.25em;
        line-height: 1.2;
        border-bottom: 1px solid #eee;
      }

      .markdown-html h2 {
        padding-bottom: 0.3em;
        font-size: 1.75em;
        line-height: 1.225;
        border-bottom: 1px solid #eee;
      }

      .markdown-html h3 {
        font-size: 1.5em;
        line-height: 1.43;
      }
      .markdown-html h4 {
        font-size: 1.25em;
      }

      .markdown-html h5 {
        font-size: 1em;
      }

      .markdown-html h6 {
        font-size: 1em;
        color: #777;
      }

      .markdown-html p,
      .markdown-html blockquote,
      .markdown-html ul,
      .markdown-html ol,
      .markdown-html dl,
      .markdown-html table,
      .markdown-html pre {
        margin-top: 0;
        margin-bottom: 16px;
      }
      .markdown-html hr {
        height: 4px;
        padding: 0;
        margin: 16px 0;
        background-color: #e7e7e7;
        border: 0 none;
      }

      .markdown-html ul,
      .markdown-html ol {
        padding-left: 2em;
      }

      .markdown-html ul ul,
      .markdown-html ul ol,
      .markdown-html ol ol,
      .markdown-html ol ul {
        margin-top: 0;
        margin-bottom: 0;
      }
      .markdown-html li > p {
        margin-top: 16px;
      }

      .markdown-html dl {
        padding: 0;
      }

      .markdown-html dl dt {
        padding: 0;
        margin-top: 16px;
        font-size: 1em;
        font-style: italic;
        font-weight: bold;
      }

      .markdown-html dl dd {
        padding: 0 16px;
        margin-bottom: 16px;
      }
      .markdown-html blockquote {
        padding: 0 15px;
        color: #777;
        border-left: 4px solid #ddd;
      }

      .markdown-html blockquote > :first-child {
        margin-top: 0;
      }

      .markdown-html blockquote > :last-child {
        margin-bottom: 0;
      }

      .markdown-html table {
        display: block;
        width: 100%;
        overflow: auto;
        word-break: normal;
        word-break: keep-all;
      }
      .markdown-html table th {
        font-weight: bold;
      }

      .markdown-html table th,
      .markdown-html table td {
        padding: 6px 13px;
        border: 1px solid #ddd;
      }

      .markdown-html table tr {
        background-color: #fff;
        border-top: 1px solid #ccc;
      }

      .markdown-html table tr:nth-child(2n) {
        background-color: #f8f8f8;
      }
      .markdown-html img {
        max-width: 100%;
        -moz-box-sizing: border-box;
        box-sizing: border-box;
      }

      .markdown-html code {
        padding: 0;
        padding-top: 0.2em;
        padding-bottom: 0.2em;
        margin: 0;
        font-size: 85%;
        background-color: rgba(0, 0, 0, 0.04);
        border-radius: 3px;
      }

      .markdown-html code::before,
      .markdown-html code::after {
        letter-spacing: -0.2em;
        content: "";
      }
      .markdown-html pre > code {
        padding: 0;
        margin: 0;
        font-size: 100%;
        word-break: normal;
        white-space: pre;
        background: transparent;
        border: 0;
      }

      .markdown-html .highlight {
        margin-bottom: 16px;
      }

      .markdown-html .highlight pre,
      .markdown-html pre {
        padding: 16px;
        overflow: auto;
        font-size: 85%;
        line-height: 1.45;
        background-color: #f7f7f7;
        border-radius: 3px;
      }
      .markdown-html .highlight pre {
        margin-bottom: 0;
        word-break: normal;
      }

      .markdown-html pre {
        word-wrap: normal;
      }

      .markdown-html pre code {
        display: inline;
        max-width: initial;
        padding: 0;
        margin: 0;
        overflow: initial;
        line-height: inherit;
        word-wrap: normal;
        background-color: transparent;
        border: 0;
      }
      .markdown-html pre code::before,
      .markdown-html pre code::after {
        content: normal;
      }
      .markdown-html .pl-c {
        color: #969896;
      }

      .markdown-html .pl-c1,
      .markdown-html .pl-mdh,
      .markdown-html .pl-mm,
      .markdown-html .pl-mp,
      .markdown-html .pl-mr,
      .markdown-html .pl-s1 .pl-v,
      .markdown-html .pl-s3,
      .markdown-html .pl-sc,
      .markdown-html .pl-sv {
        color: #0086b3;
      }

      .markdown-html .pl-e,
      .markdown-html .pl-en {
        color: #795da3;
      }
      .markdown-html .pl-s1 .pl-s2,
      .markdown-html .pl-smi,
      .markdown-html .pl-smp,
      .markdown-html .pl-stj,
      .markdown-html .pl-vo,
      .markdown-html .pl-vpf {
        color: #333;
      }

      .markdown-html .pl-ent {
        color: #63a35c;
      }

      .markdown-html .pl-k,
      .markdown-html .pl-s,
      .markdown-html .pl-st {
        color: #a71d5d;
      }

      .markdown-html .pl-pds,
      .markdown-html .pl-s1,
      .markdown-html .pl-s1 .pl-pse .pl-s2,
      .markdown-html .pl-sr,
      .markdown-html .pl-sr .pl-cce,
      .markdown-html .pl-sr .pl-sra,
      .markdown-html .pl-sr .pl-sre,
      .markdown-html .pl-src,
      .markdown-html .pl-v {
        color: #df5000;
      }
      .markdown-html .pl-id {
        color: #b52a1d;
      }

      .markdown-html .pl-ii {
        background-color: #b52a1d;
        color: #f8f8f8;
      }

      .markdown-html .pl-sr .pl-cce {
        color: #63a35c;
        font-weight: bold;
      }

      .markdown-html .pl-ml {
        color: #693a17;
      }

      .markdown-html .pl-mh,
      .markdown-html .pl-mh .pl-en,
      .markdown-html .pl-ms {
        color: #1d3e81;
        font-weight: bold;
      }
      .markdown-html .pl-mq {
        color: #008080;
      }

      .markdown-html .pl-mi {
        color: #333;
        font-style: italic;
      }

      .markdown-html .pl-mb {
        color: #333;
        font-weight: bold;
      }

      .markdown-html .pl-md,
      .markdown-html .pl-mdhf {
        background-color: #ffecec;
        color: #bd2c00;
      }

      .markdown-html .pl-mdht,
      .markdown-html .pl-mi1 {
        background-color: #eaffea;
        color: #55a532;
      }
      .markdown-html .pl-mdr {
        color: #795da3;
        font-weight: bold;
      }

      .markdown-html .pl-mo {
        color: #1d3e81;
      }

      .markdown-html kbd {
        background-color: #e7e7e7;
        background-image: -webkit-linear-gradient(#fefefe, #e7e7e7);
        background-image: linear-gradient(#fefefe, #e7e7e7);
        background-repeat: repeat-x;
        display: inline-block;
        padding: 3px 5px;
        font: 11px Consolas, "Liberation Mono", Menlo, Courier, "SansPro-Regular";
        line-height: 10px;
        color: #000;
        border: 1px solid #cfcfcf;
        border-radius: 2px;
      }
      .markdown-html .task-list-item {
        list-style-type: none;
      }

      .markdown-html .task-list-item + .task-list-item {
        margin-top: 3px;
      }

      .markdown-html .task-list-item input {
        float: left;
        margin: 0.3em 0 0.25em -1.6em;
        vertical-align: middle;
      }

    </style>

  <oe-ajax auto verbose url=[[markdownUrl]] last-response={{markdown}} handle-as="text" content-type="text/html"></oe-ajax>

  <marked-element id="_markdown" markdown={{markdown}}>
    <div class="markdown-html" slot="markdown-html"></div>
    <slot></slot>
  </marked-element>
    `;
  }
  static get properties() {
    return {
       /**
        * markdown to render
        */
      markdown: {
        type: String
      },

      /**
       * url to load the markdown data from
       */
      markdownUrl: {
        type: String,
        notify: true
      }
    }; 
  }
  /**
   * Render post process
   */
  /*global someFunction _renderPostProcess:true*/
  /*eslint no-undef: "error"*/
  _renderPostProcess() {
   
    var self = this;
    var allAnchors = this.shadowRoot.querySelectorAll('a');
    var regex = new RegExp('(?:^[a-z][a-z0-9+.-]*:|\/\/)');

    for (var i = 0, l = allAnchors.length; i < l; i++) {
      var anchor = allAnchors[i];
      var href = anchor.getAttribute('href');
      var isAbsolute = regex.test(href);
      var isMD = href.endsWith('.md') || href.endsWith('.MD');

      //relative .MD path specified in href
      if (!isAbsolute && isMD) {
        anchor.addEventListener('click', function (e) {
          var markdownUrl = self.markdownUrl || '';
          var parts = markdownUrl.split('/');
          //remove current markdown file name.
          parts.pop();

          markdownUrl = parts.join('/');
          if (markdownUrl[markdownUrl.length - 1] === '/' || e.target.getAttribute('href')[0] === '/') {
            markdownUrl += e.target.getAttribute('href');
          } else {
            markdownUrl = markdownUrl + '/' + e.target.getAttribute('href');
          }
          self.set('markdownUrl', markdownUrl);
          e.preventDefault();
        });
      }
    }
    
    self.fire('oe-marked-render-complete');
  }
   /**
    * Connected callback to handle templating if custom template is present.
    */
  connectedCallback() {
    super.connectedCallback();
    this.addEventListener('marked-render-complete', this._renderPostProcess.bind(this));
  }
  
  
}

window.customElements.define(OeMarkDownLink.is, OeMarkDownLink);