otabekoff
commented
3 months ago When I explain my issue to ChatGPT, I've got this:
Report: Handling Headers Inside Anchor Tags in Turndown
Issue Summary
In HTML-to-Markdown conversion using Turndown, headers that are nested inside anchor tags (<a>) result in incorrect Markdown output. This issue arises from the fact that Markdown does not support headers inside links, leading to inconsistencies in rendering when the content is converted.
Description
When Turndown processes HTML containing headers nested within anchor tags, the resulting Markdown output includes the link text incorrectly formatted. For example, an HTML structure like:
<a href="/foo"><h3>bar</h3></a>is converted to:
### bar
](/foo)`This results in an undesirable format when rendered, as GitHub and other Markdown processors display:
[bar](/foo)This output is inconsistent with standard Markdown behavior and can be confusing for users.
Proposed Solution
To address this issue, a custom rule was proposed to handle links inside headers by stripping out the link elements and preserving only the text content. The revised rule ensures that headers are formatted correctly without including the link markup. The proposed solution involves:
- Filtering Headings: Identifying HTML heading elements (
<h1>to<h6>) for processing. - Removing Links: Extracting and removing links and other inline elements within the heading while preserving text content.
- Formatting Output: Constructing the Markdown heading with the appropriate level and cleaned text content.
Implementation
The updated custom rule is added to the Turndown service as follows:
// Custom rule to remove links from headings
turndownService.addRule('removeLinksFromHeadings', {
filter: function (node) {
return node.nodeName.match(/^H[1-6]$/);
},
replacement: function (content, node) {
const level = Number(node.nodeName.charAt(1));
const prefix = '#'.repeat(level);
let textContent = '';
node.childNodes.forEach(child => {
if (child.nodeType === Node.TEXT_NODE) {
textContent += child.textContent;
} else if (child.nodeType === Node.ELEMENT_NODE) {
if (child.nodeName === 'A') {
textContent += child.textContent;
} else {
textContent += new TurndownService().turndown(child.outerHTML);
}
}
});
return `\n\n${prefix} ${textContent.trim()}\n\n`;
}
});Key Points
- Heading Detection: The rule targets heading elements and processes their content.
- Link Handling: Links inside headings are removed, and their text content is preserved.
- Markdown Formatting: The output is formatted according to Markdown standards, ensuring correct rendering.
Impact
The custom rule effectively resolves the issue of incorrect Markdown output for headers inside anchor tags. By removing links and ensuring proper heading formatting, it improves the consistency and readability of the converted Markdown content.
Next Steps
- Testing: Validate the rule with various HTML inputs to ensure robust handling of different cases.
- Documentation: Update documentation to reflect the custom rule and its purpose.
- Feedback: Gather feedback from users to identify any further improvements or adjustments needed.
This solution enhances Turndown's capability to handle complex HTML structures and provides a more reliable conversion to Markdown.
pavelhoral
the-djmaze
martincizek
I'm having issue of getting links of HTML headings. I've just tested it with Turndown README file on GitHub and NPMJS.
Generated content
Expected to get
I've implemented a PasteAsMarkdown.vue component page/view and my rules are not working.
Here is the full code:
```vue