schnee effeckt und fehler Korektur

node_modules/svgo/plugins/removeUnusedNS.js

@@ -1,107 +1,61 @@
 'use strict';
 
-exports.type = 'full';
-
+exports.type = 'visitor';
+exports.name = 'removeUnusedNS';
 exports.active = true;
-
 exports.description = 'removes unused namespaces declaration';
 
 /**
- * Remove unused namespaces declaration.
- *
- * @param {Object} item current iteration item
- * @return {Boolean} if false, item will be filtered out
+ * Remove unused namespaces declaration from svg element
+ * which are not used in elements or attributes
  *
  * @author Kir Belevich
+ *
+ * @type {import('../lib/types').Plugin<void>}
  */
-exports.fn = function(data) {
-
-    var svgElem,
-        xmlnsCollection = [];
-
-    /**
-     * Remove namespace from collection.
-     *
-     * @param {String} ns namescape name
-     */
-    function removeNSfromCollection(ns) {
-
-        var pos = xmlnsCollection.indexOf(ns);
-
-        // if found - remove ns from the namespaces collection
-        if (pos > -1) {
-            xmlnsCollection.splice(pos, 1);
-        }
-
-    }
-
-    /**
-     * Bananas!
-     *
-     * @param {Array} items input items
-     *
-     * @return {Array} output items
-     */
-    function monkeys(items) {
-
-        var i = 0,
-            length = items.content.length;
-
-        while(i < length) {
-
-            var item = items.content[i];
-
-            if (item.isElem('svg')) {
-
-                item.eachAttr(function(attr) {
-                    // collect namespaces
-                    if (attr.prefix === 'xmlns' && attr.local) {
-                        xmlnsCollection.push(attr.local);
-                    }
-                });
-
-                // if svg element has ns-attr
-                if (xmlnsCollection.length) {
-                    // save svg element
-                    svgElem = item;
-                }
-
-            } else if (xmlnsCollection.length) {
-
-                // check item for the ns-attrs
-                if (item.prefix) {
-                    removeNSfromCollection(item.prefix);
-                }
-
-                // check each attr for the ns-attrs
-                item.eachAttr(function(attr) {
-                    removeNSfromCollection(attr.prefix);
-                });
-
+exports.fn = () => {
+  /**
+   * @type {Set<string>}
+   */
+  const unusedNamespaces = new Set();
+  return {
+    element: {
+      enter: (node, parentNode) => {
+        // collect all namespaces from svg element
+        // (such as xmlns:xlink="http://www.w3.org/1999/xlink")
+        if (node.name === 'svg' && parentNode.type === 'root') {
+          for (const name of Object.keys(node.attributes)) {
+            if (name.startsWith('xmlns:')) {
+              const local = name.slice('xmlns:'.length);
+              unusedNamespaces.add(local);
             }
-
-            // if nothing is found - go deeper
-            if (xmlnsCollection.length && item.content) {
-                monkeys(item);
-            }
-
-            i++;
-
+          }
         }
-
-        return items;
-
-    }
-
-    data = monkeys(data);
-
-    // remove svg element ns-attributes if they are not used even once
-    if (xmlnsCollection.length) {
-        xmlnsCollection.forEach(function(name) {
-            svgElem.removeAttr('xmlns:' + name);
-        });
-    }
-
-    return data;
-
+        if (unusedNamespaces.size !== 0) {
+          // preserve namespace used in nested elements names
+          if (node.name.includes(':')) {
+            const [ns] = node.name.split(':');
+            if (unusedNamespaces.has(ns)) {
+              unusedNamespaces.delete(ns);
+            }
+          }
+          // preserve namespace used in nested elements attributes
+          for (const name of Object.keys(node.attributes)) {
+            if (name.includes(':')) {
+              const [ns] = name.split(':');
+              unusedNamespaces.delete(ns);
+            }
+          }
+        }
+      },
+      exit: (node, parentNode) => {
+        // remove unused namespace attributes from svg element
+        if (node.name === 'svg' && parentNode.type === 'root') {
+          for (const name of unusedNamespaces) {
+            delete node.attributes[`xmlns:${name}`];
+          }
+        }
+      },
+    },
+  };
 };