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Asterisks surrounded by spaces are parsed as emphasis (`a * b * c` → `a <em> b </em> c`)

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评估

难度
3/5
预计耗时
1-2 天
新手友好度
55/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
markdown, typescript
领域
content

调研方向

Start by reproducing with renderHtml('a * b * c') from the @tanstack/markdown/html entry point. The fault is in how unescaped * delimiters are classified as left- or right-flanking when whitespace sits on both sides, so look at the inline emphasis delimiter handling in the parser that renderHtml calls. Done means both repro inputs render as literal asterisks, real italic still becomes emphasis, and escaped asterisks are unchanged.

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描述

Version: @tanstack/markdown 1.0.0 (renderHtml and the React adapter)

Repro

import { renderHtml } from '@tanstack/markdown/html'

renderHtml('5 * 4 * 3 = 60')
// actual:   <p>5 <em> 4 </em> 3 = 60</p>
// expected: <p>5 * 4 * 3 = 60</p>

renderHtml('a * b * c')
// actual:   <p>a <em> b </em> c</p>
// expected: <p>a * b * c</p>

Expected

Under CommonMark's delimiter-run rules, a * followed by whitespace is not left-flanking, so it can't open emphasis. A * preceded by whitespace is not right-flanking, so it can't close emphasis. Both delimiters here have whitespace on both sides, so the text should render literally.

Other parsers agree:

Input commonmark.js 0.31.2 markdown-it 15.0.2 micromark 4.0.3 @tanstack/markdown 1.0.0
5 * 4 * 3 = 60 5 * 4 * 3 = 60 5 * 4 * 3 = 60 5 * 4 * 3 = 60 5 <em> 4 </em> 3 = 60
a * b * c a * b * c a * b * c a * b * c a <em> b </em> c
*real italic* <em>real italic</em> <em>real italic</em> <em>real italic</em> <em>real italic</em>

Why it matters

Arithmetic and multiplication in plain text (2 * 3, width * height) are common in user-written notes, and they silently turn into italics.

Escaped asterisks (5 \* 4 \* 3) render correctly. Only the flanking check on unescaped delimiters is affected.

主要语言
TypeScript
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环境准备

  • 没有 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 阅读贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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