From 2368e502bf9eacb3feec5e23a42c60d6b6de3cc4 Mon Sep 17 00:00:00 2001
From: segayuu <segayuu@gmail.com>
Date: Tue, 10 Apr 2018 14:29:12 +0900
Subject: [PATCH] refactor: Do not use arguments object (#3102)

* refactor: split function

* lodash.toArray to rest param

* remove arguments

* no use arguments

* fix param

* forTag.compile() does not use thisArg.
---
 lib/plugins/console/generate.js               |  4 +-
 .../before_post_render/backtick_code_block.js | 13 ++-
 lib/plugins/renderer/swig.js                  |  4 +-
 lib/plugins/tag/code.js                       | 86 ++++++++++---------
 lib/plugins/tag/include_code.js               | 13 ++-
 5 files changed, 59 insertions(+), 61 deletions(-)

diff --git a/lib/plugins/console/generate.js b/lib/plugins/console/generate.js
index 599b42c51f..0407567409 100644
--- a/lib/plugins/console/generate.js
+++ b/lib/plugins/console/generate.js
@@ -8,7 +8,6 @@ const chalk = require('chalk');
 const tildify = require('tildify');
 const Transform = require('stream').Transform;
 const PassThrough = require('stream').PassThrough;
-const _ = require('lodash');
 const util = require('hexo-util');
 
 const join = pathFn.join;
@@ -165,8 +164,7 @@ function generateConsole(args = {}) {
 }
 
 // Pipe a stream from one to another
-function pipeStream() {
-  const args = _.toArray(arguments);
+function pipeStream(...args) {
   const src = args.shift();
 
   return new Promise((resolve, reject) => {
diff --git a/lib/plugins/filter/before_post_render/backtick_code_block.js b/lib/plugins/filter/before_post_render/backtick_code_block.js
index 01bd27ebd3..3dd879181f 100644
--- a/lib/plugins/filter/before_post_render/backtick_code_block.js
+++ b/lib/plugins/filter/before_post_render/backtick_code_block.js
@@ -11,11 +11,8 @@ const rLangCaption = /([^\s]+)\s*(.+)?/;
 function backtickCodeBlock(data) {
   const config = this.config.highlight || {};
   if (!config.enable) return;
-  data.content = data.content.replace(rBacktick, function() {
-    const start = arguments[1];
-    const end = arguments[5];
-    const args = arguments[3].split('=').shift();
-    let content = arguments[4];
+  data.content = data.content.replace(rBacktick, ($0, start, $2, _args, content, end) => {
+    const args = _args.split('=').shift();
 
     const options = {
       hljs: config.hljs,
@@ -29,11 +26,11 @@ function backtickCodeBlock(data) {
       if (config.first_line_number === 'inline') {
 
         // setup line number by inline
-        arguments[3] = arguments[3].replace('=+', '=');
-        options.gutter = arguments[3].includes('=');
+        _args = _args.replace('=+', '=');
+        options.gutter = _args.includes('=');
 
         // setup fiestLineNumber;
-        options.firstLine = options.gutter ? arguments[3].split('=')[1] || 1 : 0;
+        options.firstLine = options.gutter ? _args.split('=')[1] || 1 : 0;
       }
     }
 
diff --git a/lib/plugins/renderer/swig.js b/lib/plugins/renderer/swig.js
index cf7b6d7261..d272df7a0c 100644
--- a/lib/plugins/renderer/swig.js
+++ b/lib/plugins/renderer/swig.js
@@ -23,8 +23,8 @@ swig.setDefaults({
 });
 
 // Hack: Override for tag of Swig
-swig.setTag('for', forTag.parse, function(compiler, args, content, parents, options, blockName) {
-  const compile = forTag.compile.apply(this, arguments).split('\n');
+swig.setTag('for', forTag.parse, (...args) => {
+  const compile = forTag.compile(...args).split('\n');
 
   compile.splice(3, 0, '  if (!Array.isArray(__l) && typeof __l.toArray === "function") { __l = __l.toArray(); }');
 
diff --git a/lib/plugins/tag/code.js b/lib/plugins/tag/code.js
index 36972b2c89..a07d23cbeb 100644
--- a/lib/plugins/tag/code.js
+++ b/lib/plugins/tag/code.js
@@ -25,60 +25,43 @@ const rMark = /\s*mark:([0-9,-]+)/i;
  *   {% endcodeblock %}
  */
 
-module.exports = ctx => function codeTag(args, content) {
-  let arg = args.join(' ');
-  const config = ctx.config.highlight || {};
-  let enable = config.enable;
-
-  if (rHighlight.test(arg)) {
-    arg = arg.replace(rHighlight, function() {
-      enable = arguments[1] === 'true';
-      return '';
-    });
-  }
-
-  if (!enable) {
-    content = escapeHTML(content);
-    return `<pre><code>${content}</code></pre>`;
-  }
+function getHighlightOptions(config, arg) {
 
-  let caption = '';
   let lang = '';
-  let line_number = config.line_number;
-  let first_line = 1;
-  let mark = [];
-  let match;
-
   if (rLang.test(arg)) {
-    arg = arg.replace(rLang, function() {
-      lang = arguments[1];
+    arg = arg.replace(rLang, (match, _lang) => {
+      lang = _lang;
       return '';
     });
   }
 
+  let line_number = config.line_number;
   if (rLineNumber.test(arg)) {
-    arg = arg.replace(rLineNumber, function() {
-      line_number = arguments[1] === 'true';
+    arg = arg.replace(rLineNumber, (match, _line_number) => {
+      line_number = _line_number === 'true';
       return '';
     });
   }
 
+  let first_line = 1;
   if (rFirstLine.test(arg)) {
-    arg = arg.replace(rFirstLine, function() {
-      first_line = arguments[1];
+    arg = arg.replace(rFirstLine, (match, _first_line) => {
+      first_line = _first_line;
       return '';
     });
   }
 
+  let mark = [];
   if (rMark.test(arg)) {
-    arg = arg.replace(rMark, function() {
-      mark = arguments[1].split(',').reduce(function getMarkedLines(prev, cur) {
-        let a, b, temp;
+    arg = arg.replace(rMark, (match, _mark) => {
+      mark = _mark.split(',').reduce(function getMarkedLines(prev, cur) {
         if (/-/.test(cur)) {
-          a = Number(cur.substr(0, cur.indexOf('-')));
-          b = Number(cur.substr(cur.indexOf('-') + 1));
+          let a = Number(cur.substr(0, cur.indexOf('-')));
+          let b = Number(cur.substr(cur.indexOf('-') + 1));
           if (b < a) { // switch a & b
-            temp = a; a = b; b = temp;
+            const temp = a;
+            a = b;
+            b = temp;
           }
 
           for (; a <= b; a++) {
@@ -96,20 +79,19 @@ module.exports = ctx => function codeTag(args, content) {
     });
   }
 
+  let caption = '';
   if (rCaptionUrlTitle.test(arg)) {
-    match = arg.match(rCaptionUrlTitle);
+    const match = arg.match(rCaptionUrlTitle);
     caption = `<span>${match[1]}</span><a href="${match[2]}${match[3]}">${match[4]}</a>`;
   } else if (rCaptionUrl.test(arg)) {
-    match = arg.match(rCaptionUrl);
+    const match = arg.match(rCaptionUrl);
     caption = `<span>${match[1]}</span><a href="${match[2]}${match[3]}">link</a>`;
   } else if (rCaption.test(arg)) {
-    match = arg.match(rCaption);
+    const match = arg.match(rCaption);
     caption = `<span>${match[1]}</span>`;
   }
 
-  content = stripIndent(content);
-
-  content = highlight(content, {
+  return {
     lang,
     firstLine: first_line,
     caption,
@@ -118,7 +100,29 @@ module.exports = ctx => function codeTag(args, content) {
     mark,
     tab: config.tab_replace,
     autoDetect: config.auto_detect
-  });
+  };
+}
+
+module.exports = ctx => function codeTag(args, content) {
+  let arg = args.join(' ');
+  const config = ctx.config.highlight || {};
+  let enable = config.enable;
+
+  if (rHighlight.test(arg)) {
+    arg = arg.replace(rHighlight, (match, _enable) => {
+      enable = _enable === 'true';
+      return '';
+    });
+  }
+
+  if (!enable) {
+    content = escapeHTML(content);
+    return `<pre><code>${content}</code></pre>`;
+  }
+
+  content = stripIndent(content);
+
+  content = highlight(content, getHighlightOptions(config, arg));
 
   content = content.replace(/{/g, '&#123;')
     .replace(/}/g, '&#125;');
diff --git a/lib/plugins/tag/include_code.js b/lib/plugins/tag/include_code.js
index 6ea6163db6..8c321bf50c 100644
--- a/lib/plugins/tag/include_code.js
+++ b/lib/plugins/tag/include_code.js
@@ -20,21 +20,20 @@ module.exports = ctx => function includeCodeTag(args) {
   const config = ctx.config.highlight || {};
   let codeDir = ctx.config.code_dir;
   let arg = args.join(' ');
-  let path = '';
-  let title = '';
-  let lang = '';
-  let caption = '';
 
   // Add trailing slash to codeDir
   if (codeDir[codeDir.length - 1] !== '/') codeDir += '/';
 
+  let lang = '';
   if (rLang.test(arg)) {
-    arg = arg.replace(rLang, function() {
-      lang = arguments[1];
+    arg = arg.replace(rLang, (match, _lang) => {
+      lang = _lang;
       return '';
     });
   }
 
+  let title = '';
+  let path = '';
   if (rCaptionTitleFile.test(arg)) {
     const match = arg.match(rCaptionTitleFile);
     title = match[1];
@@ -63,7 +62,7 @@ module.exports = ctx => function includeCodeTag(args) {
     // If the language is not defined, use file extension instead
     lang = lang || pathFn.extname(path).substring(1);
 
-    caption = `<span>${title}</span><a href="${ctx.config.root}${codeDir}${path}">view raw</a>`;
+    const caption = `<span>${title}</span><a href="${ctx.config.root}${codeDir}${path}">view raw</a>`;
 
     return highlight(code, {
       lang,