refactor(ivy): Use AttributeMarker instead of NS (#23899)

- Removes NS enum
- Uses existing AttributeMarker
- Adds enum value NAMESPACE_URI

PR Close #23899

packages/core/src/render3/di.ts

@@ -262,7 +262,7 @@ export function injectAttribute(attrNameToInject: string): string|undefined {
     for (let i = 0; i < attrs.length; i = i + 2) {
       let attrName = attrs[i];
       if (attrName === AttributeMarker.SELECT_ONLY) break;
-      if (attrName === 0) {  // NS.FULL
+      if (attrName === AttributeMarker.NAMESPACE_URI) {
         attrName = attrs[i += 2];
       }
       if (attrName == attrNameToInject) {

packages/core/src/render3/instructions.ts

@@ -843,8 +843,7 @@ function setUpAttributes(native: RElement, attrs: TAttributes): void {
   const isProc = isProceduralRenderer(renderer);
   for (let i = 0; i < attrs.length; i += 2) {
     let attrName = attrs[i];
-    if (attrName === 0) {  // NS.FULL
-      // Namespaced attribute
+    if (attrName === AttributeMarker.NAMESPACE_URI) {
       const attrNS = attrs[i + 1] as string;
       attrName = attrs[i + 2] as string;
       const attrVal = attrs[i + 3] as string;
@@ -1516,7 +1515,7 @@ function generateInitialInputs(
   const attrs = tNode.attrs !;
   for (let i = 0; i < attrs.length; i += 2) {
     const first = attrs[i];
-    const attrName = first === 0 ? attrs[i += 2] : first;  // 0 = NS.FULL
+    const attrName = first === AttributeMarker.NAMESPACE_URI ? attrs[i += 2] : first;
     const minifiedInputName = inputs[attrName];
     const attrValue = attrs[i + 1];
 

packages/core/src/render3/interfaces/node.ts

@@ -12,18 +12,6 @@ import {LQueries} from './query';
 import {RElement, RNode, RText} from './renderer';
 import {LView, TData, TView} from './view';
 
-
-/**
- * Namespace attribute flags.
- */
-export const enum NS {
-  /**
-   * Use the next value as the full namespaces URI, the values after that
-   * are then the name and the value, respectively.
-   */
-  FULL = 0,
-}
-
 /**
  * TNodeType corresponds to the TNode.type property. It contains information
  * on how to map a particular set of bits in LNode.flags to the node type.
@@ -172,7 +160,11 @@ export interface LProjectionNode extends LNode {
  * items are not regular attributes and the processing should be adapted accordingly.
  */
 export const enum AttributeMarker {
-  NS = 0,  // namespace. Has to be repeated.
+  /**
+   * Use the next value as the full namespaces URI, the values after that
+   * are then the name and the value, respectively.
+   */
+  NAMESPACE_URI = 0,  // namespace. Has to be repeated.
 
   /**
    * This marker indicates that the following attribute names were extracted from bindings (ex.:
@@ -188,7 +180,7 @@ export const enum AttributeMarker {
  * - attribute names and values
  * - special markers acting as flags to alter attributes processing.
  */
-export type TAttributes = (string | AttributeMarker | NS)[];
+export type TAttributes = (string | AttributeMarker)[];
 
 /**
  * LNode binding data (flyweight) for a particular node that is shared between all templates

packages/core/src/render3/node_selector_matcher.ts

@@ -107,8 +107,7 @@ function findAttrIndexInNode(name: string, attrs: TAttributes | null): number {
   if (attrs === null) return -1;
   for (let i = 0; i < attrs.length; i += step) {
     const attrName = attrs[i];
-    if (attrName === 0) {
-      // NS.FULL
+    if (attrName === AttributeMarker.NAMESPACE_URI) {
       step = 2;
     } else if (attrName === name) {
       return i;