From b0cb51367d8c68eabafaa57c2967587007aa79bd Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Mon, 20 Mar 2023 21:20:21 +0900
Subject: feat(nuldoc): support XML comments

---
 nuldoc-src/xml.ts | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/nuldoc-src/xml.ts b/nuldoc-src/xml.ts
index f07161f..13ec5d6 100644
--- a/nuldoc-src/xml.ts
+++ b/nuldoc-src/xml.ts
@@ -56,12 +56,19 @@ function parseChildNodes(p: Parser): Node[] {
   const nodes = [];
   while (true) {
     const c = peek(p);
-    const c2 = peek2(p);
+    const c2 = peekN(p, 2);
+    const c3 = peekN(p, 3);
     if (c === "<") {
       if (c2 === "/") {
         break;
       } else if (c2 === "!") {
-        nodes.push(parseCdata(p));
+        if (c3 === "[") {
+          // <![CDATA[
+          nodes.push(parseCdata(p));
+        } else {
+          // <!--
+          skipComment(p);
+        }
       } else {
         nodes.push(parseXmlElement(p));
       }
@@ -92,6 +99,12 @@ function parseCdata(p: Parser): Text {
   };
 }
 
+function skipComment(p: Parser) {
+  expect(p, "<!--");
+  skipTo(p, "-->");
+  next(p, "-->".length);
+}
+
 function formatCdata(s: string): string {
   // <![CDATA[
   //   foo
@@ -218,11 +231,11 @@ function skipWhitespaces(p: Parser) {
 }
 
 function peek(p: Parser): string | null {
-  return (p.index < p.source.length) ? p.source[p.index] : null;
+  return peekN(p, 1);
 }
 
-function peek2(p: Parser): string | null {
-  return (p.index + 1 < p.source.length) ? p.source[p.index + 1] : null;
+function peekN(p: Parser, n: number): string | null {
+  return (p.index + n - 1 < p.source.length) ? p.source[p.index + n - 1] : null;
 }
 
 function next(p: Parser, n = 1) {
-- 
cgit v1.2.3-70-g09d2