From 88ba6cfe220216f371f8756921059fac51a21262 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Fri, 23 Dec 2022 23:27:09 +0900
Subject: AsciiDoc to DocBook

---
 nuldoc-src/dom.ts | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 nuldoc-src/dom.ts

(limited to 'nuldoc-src/dom.ts')

diff --git a/nuldoc-src/dom.ts b/nuldoc-src/dom.ts
new file mode 100644
index 0000000..51ef25a
--- /dev/null
+++ b/nuldoc-src/dom.ts
@@ -0,0 +1,79 @@
+export type Text = {
+  kind: "text";
+  content: string;
+};
+
+export type Element = {
+  kind: "element";
+  name: string;
+  attributes: Map<string, string>;
+  children: Node[];
+};
+
+export type Node = Element | Text;
+
+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 removeChildElements(e: Element, name: string) {
+  e.children = e.children.filter((c) =>
+    c.kind !== "element" || c.name !== name
+  );
+}
+
+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 function forEachChildRecursively(e: Element, f: (n: Node) => void) {
+  const g = (c: Node) => {
+    f(c);
+    if (c.kind === "element") {
+      forEachChild(c, g);
+    }
+  };
+  forEachChild(e, g);
+}
-- 
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