refactor methods into root class

Framework/IJSVG/IJSVG/Source/Nodes/IJSVGNode.h

@@ -198,4 +198,7 @@ void IJSVGAssertPaintableObject(id object);
 - (BOOL)matchesTraits:(IJSVGNodeTraits)traits;
 - (void)computeTraits;
 
+- (instancetype)parentNodeMatchingClass:(Class)class;
+- (instancetype)rootNodeMatchingClass:(Class)class;
+
 @end

Framework/IJSVG/IJSVG/Source/Nodes/IJSVGNode.m

@@ -507,4 +507,31 @@
     return (IJSVGRootNode*)parent;
 }
 
+- (instancetype)parentNodeMatchingClass:(Class)class
+{
+    IJSVGNode* parent = self.parentNode;
+    if([parent isKindOfClass:class] == YES) {
+        return parent;
+    }
+    return [parent parentNodeMatchingClass:class];
+}
+
+- (instancetype)rootNodeMatchingClass:(Class)class
+{
+    IJSVGRootNode* rootNode = self.rootNode;
+    IJSVGNode* parentNode = self.parentNode;
+    IJSVGNode* foundNode = nil;
+    while(parentNode != nil) {
+        // break on root node or if its matching
+        if(parentNode == rootNode || parentNode == nil) {
+            break;
+        }
+        if([parentNode isKindOfClass:class] == YES) {
+            foundNode = parentNode;
+        }
+        parentNode = parentNode.parentNode;
+    }
+    return foundNode;
+}
+
 @end

Framework/IJSVG/IJSVG/Source/Nodes/IJSVGPattern.m

@@ -22,25 +22,6 @@
     return self;
 }
 
-- (IJSVGPattern*)rootPattern
-{
-    IJSVGRootNode* rootNode = self.rootNode;
-    IJSVGNode* parentNode = self.parentNode;
-    IJSVGPattern* parentPattern = nil;
-    while(parentNode != nil) {
-        if(parentNode == rootNode || parentNode == nil) {
-            break;
-        }
-        // actual check the type, if it Pattern, just store
-        // reference to it and keep going up the chain
-        if([parentNode isKindOfClass:IJSVGPattern.class]) {
-            parentPattern = (IJSVGPattern*)parentNode;
-        }
-        parentNode = parentNode.parentNode;
-    }
-    return parentPattern;
-}
-
 - (IJSVGUnitType)contentUnitsWithReferencingNodeBounds:(CGRect*)bounds
 {
     // as far as I can tell, units are inherited, so we need to go to the root
@@ -48,7 +29,7 @@
     // units as the actual units, but the bounds are based on the units of current
     // units defined on this node... wtf?!
     IJSVGNode* node = nil;
-    IJSVGPattern* parentPattern = [self rootPattern];
+    IJSVGPattern* parentPattern = [self rootNodeMatchingClass:self.class];
     IJSVGUnitType units = [self contentUnitsWithReferencingNode:&node];
     if(units == IJSVGUnitUserSpaceOnUse) {
         *bounds = node.rootNode.bounds;