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backend/node_modules/svgo/plugins/removeEmptyContainers.js

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+'use strict';
+
+const { detachNodeFromParent } = require('../lib/xast.js');
+const { elemsGroups } = require('./_collections.js');
+
+exports.name = 'removeEmptyContainers';
+exports.description = 'removes empty container elements';
+
+/**
+ * Remove empty containers.
+ *
+ * @see https://www.w3.org/TR/SVG11/intro.html#TermContainerElement
+ *
+ * @example
+ * <defs/>
+ *
+ * @example
+ * <g><marker><a/></marker></g>
+ *
+ * @author Kir Belevich
+ *
+ * @type {import('./plugins-types').Plugin<'removeEmptyContainers'>}
+ */
+exports.fn = () => {
+  return {
+    element: {
+      exit: (node, parentNode) => {
+        // remove only empty non-svg containers
+        if (
+          node.name === 'svg' ||
+          !elemsGroups.container.has(node.name) ||
+          node.children.length !== 0
+        ) {
+          return;
+        }
+        // empty patterns may contain reusable configuration
+        if (
+          node.name === 'pattern' &&
+          Object.keys(node.attributes).length !== 0
+        ) {
+          return;
+        }
+        // The <g> may not have content, but the filter may cause a rectangle
+        // to be created and filled with pattern.
+        if (node.name === 'g' && node.attributes.filter != null) {
+          return;
+        }
+        // empty <mask> hides masked element
+        if (node.name === 'mask' && node.attributes.id != null) {
+          return;
+        }
+        if (parentNode.type === 'element' && parentNode.name === 'switch') {
+          return;
+        }
+        detachNodeFromParent(node, parentNode);
+      },
+    },
+  };
+};