1 files changed, 102 insertions, 0 deletions
diff --git a/services/blog/nuldoc-src/dom.ts b/services/blog/nuldoc-src/dom.ts
new file mode 100644
index 00000000..ed7ffd31
--- /dev/null
+++ b/services/blog/nuldoc-src/dom.ts
@@ -0,0 +1,102 @@
+export type Text = {
+  kind: "text";
+  content: string;
+  raw: false;
+};
+
+export type RawHTML = {
+  kind: "text";
+  content: string;
+  raw: true;
+};
+
+export type Element = {
+  kind: "element";
+  name: string;
+  attributes: Map<string, string>;
+  children: Node[];
+};
+
+export type Node = Element | Text | RawHTML;
+
+export function addClass(e: Element, klass: string) {
+  const classes = e.attributes.get("class");
+  if (classes === undefined) {
+    e.attributes.set("class", klass);
+  } else {
+    const classList = classes.split(" ");
+    classList.push(klass);
+    classList.sort();
+    e.attributes.set("class", classList.join(" "));
+  }
+}
+
+export function findFirstChildElement(
+  e: Element,
+  name: string,
+): Element | null {
+  for (const c of e.children) {
+    if (c.kind === "element" && c.name === name) {
+      return c;
+    }
+  }
+  return null;
+}
+
+export function findChildElements(e: Element, name: string): Element[] {
+  const cs = [];
+  for (const c of e.children) {
+    if (c.kind === "element" && c.name === name) {
+      cs.push(c);
+    }
+  }
+  return cs;
+}
+
+export function innerText(e: Element): string {
+  let t = "";
+  forEachChild(e, (c) => {
+    if (c.kind === "text") {
+      t += c.content;
+    }
+  });
+  return t;
+}
+
+export function forEachChild(e: Element, f: (n: Node) => void) {
+  for (const c of e.children) {
+    f(c);
+  }
+}
+
+export async function forEachChildAsync(
+  e: Element,
+  f: (n: Node) => Promise<void>,
+): Promise<void> {
+  for (const c of e.children) {
+    await f(c);
+  }
+}
+
+export function forEachChildRecursively(e: Element, f: (n: Node) => void) {
+  const g = (c: Node) => {
+    f(c);
+    if (c.kind === "element") {
+      forEachChild(c, g);
+    }
+  };
+  forEachChild(e, g);
+}
+
+export async function forEachChildRecursivelyAsync(
+  e: Element,
+  f: (n: Node) => Promise<void>,
+): Promise<void> {
+  const g = async (c: Node) => {
+    await f(c);
+    if (c.kind === "element") {
+      await forEachChildAsync(c, g);
+    }
+  };
+  await forEachChildAsync(e, g);
+}