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.
由索引模型根据 Issue 内容生成。
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.
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