go!

plugins/moveElemsAttrsToGroup.js

@@ -0,0 +1,57 @@
+var intersectAttrs = require('../lib/tools').intersectAttrs;
+
+/**
+ * Collapse content's intersected attributes to the existing group wrapper.
+ *
+ * @example
+ * <g attr1="val1">
+ *     <g attr2="val2">
+ *         text
+ *     </g>
+ *     <circle attr2="val2" attr3="val3"/>
+ * </g>
+ *              ⬇
+ * <g attr1="val1" attr2="val2">
+ *     <g>
+ *         text
+ *     </g>
+ *    <circle attr3="val3"/>
+ * </g>
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.moveElemsAttrsToGroup = function(item, params) {
+
+    if (item.isElem('g') && !item.isEmpty() && item.content.length > 1) {
+
+        var intersection = {},
+            every = item.content.every(function(g) {
+                if (g.isElem() && g.hasAttr()) {
+                    if (!Object.keys(intersection).length) {
+                        intersection = g.attrs;
+                    } else {
+                        intersection = intersectAttrs(intersection, g.attrs)
+                    }
+
+                    return true;
+                }
+            });
+
+        if (every && Object.keys(intersection).length) {
+
+            item.content.forEach(function(g) {
+                for (var name in intersection) {
+                    g.removeAttr(name);
+                    item.addAttr(intersection[name]);
+                }
+            });
+
+        }
+
+    }
+
+};