feat: optimise detection of data and svg names (#1058)

Co-authored-by: chris <chris@bumblehead.com>

src/h.ts

@@ -16,7 +16,7 @@ export type VNodeChildren = ArrayOrElement<VNodeChildElement>;
 export function addNS(
   data: any,
   children: Array<VNode | string> | undefined,
-  sel: string | undefined
+  sel: string | undefined,
 ): void {
   data.ns = "http://www.w3.org/2000/svg";
   if (sel !== "foreignObject" && children !== undefined) {
@@ -37,7 +37,7 @@ export function h(sel: string, children: VNodeChildren): VNode;
 export function h(
   sel: string,
   data: VNodeData | null,
-  children: VNodeChildren
+  children: VNodeChildren,
 ): VNode;
 export function h(sel: any, b?: any, c?: any): VNode {
   let data: VNodeData = {};
@@ -74,14 +74,12 @@ export function h(sel: any, b?: any, c?: any): VNode {
           undefined,
           undefined,
           children[i],
-          undefined
+          undefined,
         );
     }
   }
   if (
-    sel[0] === "s" &&
+    sel.startsWith("svg") &&
-    sel[1] === "v" &&
-    sel[2] === "g" &&
     (sel.length === 3 || sel[3] === "." || sel[3] === "#")
   ) {
     addNS(data, children, sel);

src/tovnode.ts

@@ -21,13 +21,7 @@ export function toVNode(node: Node, domApi?: DOMAPI): VNode {
     const elmChildren = node.childNodes;
     for (i = 0, n = elmAttrs.length; i < n; i++) {
       name = elmAttrs[i].nodeName;
-      if (
+      if (name.startsWith("data-")) {
-        name[0] === "d" &&
-        name[1] === "a" &&
-        name[2] === "t" &&
-        name[3] === "a" &&
-        name[4] === "-"
-      ) {
         dataset[name.slice(5)] = elmAttrs[i].nodeValue || "";
       } else if (name !== "id" && name !== "class") {
         attrs[name] = elmAttrs[i].nodeValue;
@@ -41,9 +35,7 @@ export function toVNode(node: Node, domApi?: DOMAPI): VNode {
     if (Object.keys(dataset).length > 0) data.dataset = dataset;
 
     if (
-      sel[0] === "s" &&
+      sel.startsWith("svg") &&
-      sel[1] === "v" &&
-      sel[2] === "g" &&
       (sel.length === 3 || sel[3] === "." || sel[3] === "#")
     ) {
       addNS(data, children, sel);