fix: allow list markers indented by up to 4 spaces

src/rules.ts

@@ -68,11 +68,11 @@ export const other = {
   notSpaceStart: /^\S*/,
   endingNewline: /\n$/,
   listItemRegex: (bull: string) => new RegExp(`^( {0,3}${bull})((?:[\t ][^\\n]*)?(?:\\n|$))`),
-  nextBulletRegex: (indent: number) => new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:[*+-]|\\d{1,9}[.)])((?:[ \t][^\\n]*)?(?:\\n|$))`),
-  hrRegex: (indent: number) => new RegExp(`^ {0,${Math.min(3, indent - 1)}}((?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$)`),
-  fencesBeginRegex: (indent: number) => new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:\`\`\`|~~~)`),
-  headingBeginRegex: (indent: number) => new RegExp(`^ {0,${Math.min(3, indent - 1)}}#`),
-  htmlBeginRegex: (indent: number) => new RegExp(`^ {0,${Math.min(3, indent - 1)}}<(?:[a-z].*>|!--)`, 'i'),
+  nextBulletRegex: (indent: number) => new RegExp(`^ {0,${indent}}(?:[*+-]|\\d{1,9}[.)])((?:[ \t][^\\n]*)?(?:\\n|$))`),
+  hrRegex: (indent: number) => new RegExp(`^ {0,${indent}}((?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$)`),
+  fencesBeginRegex: (indent: number) => new RegExp(`^ {0,${indent}}(?:\`\`\`|~~~)`),
+  headingBeginRegex: (indent: number) => new RegExp(`^ {0,${indent}}#`),
+  htmlBeginRegex: (indent: number) => new RegExp(`^ {0,${indent}}<(?:[a-z].*>|!--)`, 'i'),
 };
 
 /**
@@ -112,7 +112,7 @@ const def = edit(/^ {0,3}\[(label)\]: *(?:\n[ \t]*)?([^<\s][^\s]*|<.*?>)(?:(?: +
   .replace('title', /(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/)
   .getRegex();
 
-const list = edit(/^( {0,3}bull)([ \t][^\n]+?)?(?:\n|$)/)
+const list = edit(/^( {0,4}bull)([ \t][^\n]+?)?(?:\n|$)/)
   .replace(/bull/g, bullet)
   .getRegex();
 

test/unit/Lexer.test.js

@@ -1045,15 +1045,15 @@ paragraph
             items: [
               {
                 type: 'list_item',
-                raw: '- item 1\n  - item 2',
+                raw: '- item 1\n',
                 task: false,
                 checked: undefined,
                 loose: false,
-                text: 'item 1\n- item 2',
+                text: 'item 1',
                 tokens: [
                   {
                     type: 'text',
-                    raw: 'item 1\n',
+                    raw: 'item 1',
                     text: 'item 1',
                     tokens: [
                       {
@@ -1064,35 +1064,26 @@ paragraph
                       },
                     ],
                   },
+                ],
+              },
+              {
+                type: 'list_item',
+                raw: '  - item 2\n',
+                task: false,
+                checked: null,
+                loose: false,
+                text: 'item 2',
+                tokens: [
                   {
-                    type: 'list',
-                    raw: '- item 2',
-                    ordered: false,
-                    start: '',
-                    loose: false,
-                    items: [
+                    type: 'text',
+                    raw: 'item 2',
+                    text: 'item 2',
+                    tokens: [
                       {
-                        type: 'list_item',
-                        raw: '- item 2',
-                        task: false,
-                        checked: undefined,
-                        loose: false,
+                        type: 'text',
+                        raw: 'item 2',
                         text: 'item 2',
-                        tokens: [
-                          {
-                            type: 'text',
-                            raw: 'item 2',
-                            text: 'item 2',
-                            tokens: [
-                              {
-                                type: 'text',
-                                raw: 'item 2',
-                                text: 'item 2',
-                                escaped: false,
-                              },
-                            ],
-                          },
-                        ],
+                        escaped: false,
                       },
                     ],
                   },

test/unit/nested-list-indentation.test.js

@@ -0,0 +1,25 @@
+import { Marked } from '../../lib/marked.esm.js';
+import assert from 'node:assert';
+import { describe, it } from 'node:test';
+
+describe('nested list indentation', () => {
+  const marked = new Marked();
+
+  it('should parse nested list with 4-space indentation correctly', () => {
+    const markdown = `- title
+    - desc
+    -`;
+    const expected = '<ul>\n<li>title</li>\n<li>desc</li>\n<li></li>\n</ul>\n';
+    const result = marked.parse(markdown);
+    assert.strictEqual(result, expected);
+  });
+
+  it('should parse nested list with 2-space indentation correctly', () => {
+    const markdown = `- title
+  - desc
+  -`;
+    const expected = '<ul>\n<li>title</li>\n<li>desc</li>\n<li></li>\n</ul>\n';
+    const result = marked.parse(markdown);
+    assert.strictEqual(result, expected);
+  });
+});