Refactor basic plugins with visitor api (#1518)

- cleanupAttrs
- convertEllipseToCircle
- removeDesc
- removeDoctype
- removeEmptyText
- removeMetadata
- removeRasterImages
- removeScriptElement
- removeStyleElement
- removeTitle
- removeXMLProcInst

plugins/removeRasterImages.js

@@ -1,9 +1,9 @@
 'use strict';
 
-exports.type = 'perItem';
+const { detachNodeFromParent } = require('../lib/xast.js');
 
+exports.type = 'visitor';
 exports.active = false;
-
 exports.description = 'removes raster images (disabled by default)';
 
 /**
@@ -11,18 +11,20 @@ exports.description = 'removes raster images (disabled by default)';
  *
  * @see https://bugs.webkit.org/show_bug.cgi?id=63548
  *
- * @param {Object} item current iteration item
- * @return {Boolean} if false, item will be filtered out
- *
  * @author Kir Belevich
  */
-exports.fn = function (item) {
-  if (
-    item.type === 'element' &&
-    item.name === 'image' &&
-    item.attributes['xlink:href'] != null &&
-    /(\.|image\/)(jpg|png|gif)/.test(item.attributes['xlink:href'])
-  ) {
-    return false;
-  }
+exports.fn = () => {
+  return {
+    element: {
+      enter: (node, parentNode) => {
+        if (
+          node.name === 'image' &&
+          node.attributes['xlink:href'] != null &&
+          /(\.|image\/)(jpg|png|gif)/.test(node.attributes['xlink:href'])
+        ) {
+          detachNodeFromParent(node, parentNode);
+        }
+      },
+    },
+  };
 };