Refactor(es2015 & RegExp) (#97)

* Auto Refactoring from lebab
* Remove no use Groups
* Remove namespace object
* indexOf to startsWith
* Reduce prot scope

Author: segayuu

lib/renderer.js

@@ -1,12 +1,9 @@
 'use strict';
 
-var marked = require('marked');
-var stripIndent = require('strip-indent');
-var util = require('hexo-util');
-
-var highlight = util.highlight;
-var stripHTML = util.stripHTML;
-var MarkedRenderer = marked.Renderer;
+const marked = require('marked');
+const stripIndent = require('strip-indent');
+const { stripHTML, highlight, slugize } = require('hexo-util');
+const MarkedRenderer = marked.Renderer;
 
 function Renderer() {
   MarkedRenderer.apply(this);
@@ -18,29 +15,29 @@ require('util').inherits(Renderer, MarkedRenderer);
 
 // Add id attribute to headings
 Renderer.prototype.heading = function(text, level) {
-  var transformOption = this.options.modifyAnchors;
-  var id = anchorId(stripHTML(text), transformOption);
-  var headingId = this._headingId;
+  const transformOption = this.options.modifyAnchors;
+  let id = anchorId(stripHTML(text), transformOption);
+  const headingId = this._headingId;
 
   // Add a number after id if repeated
   if (headingId[id]) {
-    id += '-' + headingId[id]++;
+    id += `-${headingId[id]++}`;
   } else {
     headingId[id] = 1;
   }
   // add headerlink
-  return '<h' + level + ' id="' + id + '"><a href="#' + id + '" class="headerlink" title="' + stripHTML(text) + '"></a>' + text + '</h' + level + '>';
+  return `<h${level} id="${id}"><a href="#${id}" class="headerlink" title="${stripHTML(text)}"></a>${text}</h${level}>`;
 };
 
 function anchorId(str, transformOption) {
-  return util.slugize(str.trim(), {transform: transformOption});
+  return slugize(str.trim(), {transform: transformOption});
 }
 
 // Support AutoLink option
 Renderer.prototype.link = function(href, title, text) {
-  var prot;
-
   if (this.options.sanitize) {
+    let prot;
+
     try {
       prot = decodeURIComponent(unescape(href))
           .replace(/[^\w:]/g, '')
@@ -49,7 +46,7 @@ Renderer.prototype.link = function(href, title, text) {
       return '';
     }
 
-    if (prot.indexOf('javascript:') === 0 || prot.indexOf('vbscript:') === 0 || prot.indexOf('data:') === 0) {
+    if (prot.startsWith('javascript:') || prot.startsWith('vbscript:') || prot.startsWith('data:')) {
       return '';
     }
   }
@@ -58,41 +55,34 @@ Renderer.prototype.link = function(href, title, text) {
     return href;
   }
 
-  var out = '<a href="' + href + '"';
+  let out = `<a href="${href}"`;
 
   if (title) {
-    out += ' title="' + title + '"';
+    out += ` title="${title}"`;
   }
 
-  out += '>' + text + '</a>';
+  out += `>${text}</a>`;
   return out;
 };
 
 // Support Basic Description Lists
-Renderer.prototype.paragraph = function(text) {
-  var result = '';
-  var dlTest = /(^|\s)(\S.+)(<br>:(\s+))(\S.+)/;
-
-  var dl
-    = '<dl>'
-      + '<dt>$2</dt>'
-      + '<dd>$5</dd>'
-    + '</dl>';
-
-  if (text.match(dlTest)) {
-    result = text.replace(dlTest, dl);
-  } else {
-    result = '<p>' + text + '</p>\n';
+Renderer.prototype.paragraph = text => {
+  const dlTest = /(?:^|\s)(\S.+)<br>:\s+(\S.+)/;
+
+  const dl = '<dl><dt>$1</dt><dd>$2</dd></dl>';
+
+  if (dlTest.test(text)) {
+    return text.replace(dlTest, dl);
   }
 
-  return result;
+  return `<p>${text}</p>\n`;
 };
 
 marked.setOptions({
   langPrefix: '',
-  highlight: function(code, lang) {
+  highlight(code, lang) {
     return highlight(stripIndent(code), {
-      lang: lang,
+      lang,
       gutter: false,
       wrap: false
     });