add initial marp implementation with sample content and build configuration

node_modules/speech-rule-engine/mjs/walker/walker_util.js

@@ -0,0 +1,33 @@
+import * as DomUtil from '../common/dom_util.js';
+import { Attribute } from '../enrich_mathml/enrich_attr.js';
+export function splitAttribute(attr) {
+    return !attr ? [] : attr.split(/,/);
+}
+export function getAttribute(node, attr) {
+    return node.getAttribute(attr);
+}
+export function getSemanticRoot(node) {
+    if (node.hasAttribute(Attribute.TYPE) &&
+        !node.hasAttribute(Attribute.PARENT)) {
+        return node;
+    }
+    const semanticNodes = DomUtil.querySelectorAllByAttr(node, Attribute.TYPE);
+    for (let i = 0, semanticNode; (semanticNode = semanticNodes[i]); i++) {
+        if (!semanticNode.hasAttribute(Attribute.PARENT)) {
+            return semanticNode;
+        }
+    }
+    return node;
+}
+export function getBySemanticId(root, id) {
+    if (root.getAttribute(Attribute.ID) === id) {
+        return root;
+    }
+    return DomUtil.querySelectorAllByAttrValue(root, Attribute.ID, id)[0];
+}
+export function getAllBySemanticId(root, id) {
+    if (root.getAttribute(Attribute.ID) === id) {
+        return [root];
+    }
+    return DomUtil.querySelectorAllByAttrValue(root, Attribute.ID, id);
+}