flow like the river

VISUALIZACION/node_modules/svgo/plugins/removeUselessDefs.js

@@ -0,0 +1,53 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes elements in <defs> without id';
+
+var nonRendering = require('./_collections').elemsGroups.nonRendering;
+
+/**
+ * Removes content of defs and properties that aren't rendered directly without ids.
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Lev Solntsev
+ */
+exports.fn = function(item) {
+
+    if (item.isElem('defs')) {
+
+        if (item.content) {
+            item.content = getUsefulItems(item, []);
+        }
+        
+        if (item.isEmpty()) return false;
+
+    } else if (item.isElem(nonRendering) && !item.hasAttr('id')) {
+
+        return false;
+
+    }
+
+};
+
+function getUsefulItems(item, usefulItems) {
+
+    item.content.forEach(function(child) {
+        if (child.hasAttr('id') || child.isElem('style')) {
+
+            usefulItems.push(child);
+            child.parentNode = item;
+
+        } else if (!child.isEmpty()) {
+
+            child.content = getUsefulItems(child, usefulItems);
+
+        }
+    });
+
+    return usefulItems;
+}