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solonovamax opened this issue May 20, 2025 · 1 comment
Open

xml stylesheets do not properly support html features #10166

solonovamax opened this issue May 20, 2025 · 1 comment

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@solonovamax
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🐛 bug report

*.xslt files included via <?xml-stylesheet ...?> do not properly support all html features, such as:

  • dependencies
  • inline scripts/styles
  • posthtml minification
  • etc.

Also somewhat related, but .xsl and .xslt files cannot be processed directly by parcel. Right now they can only be referenced via <?xml-stylesheet ...?>.
It would be super nice if they could just be processed directly, eg. parcel build file.xslt.
My usecase for this is that my rss feeds are dynamically generated, and I just want to insert a reference to the stylesheet at the top of them.

Sample stylesheet:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:atom="http://www.w3.org/2005/Atom">
    <xsl:output method="html" version="1.0" encoding="UTF-8" indent="yes"/>
    <xsl:template match="/">
        <html>
            <head>
                <meta name="viewport" content="width=device-width, initial-scale=1"/>
                <meta name="referrer" content="unsafe-url"/>
                <title>
                    <xsl:value-of select="/atom:feed/atom:title"/>
                </title>
                <link rel="stylesheet" href="/src/assets/scss/water/core.scss"/>
            </head>
        </html>
    </xsl:template>
</xsl:stylesheet>

🤔 Expected Behavior

html is properly processed.

Expected output:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:atom="http://www.w3.org/2005/Atom">
    <xsl:output method="html" version="1.0" encoding="UTF-8" indent="yes"/>
    <xsl:template match="/">
        <html>
            <head>
                <meta name="viewport" content="width=device-width, initial-scale=1"/>
                <meta name="referrer" content="unsafe-url"/>
                <title>
                    <xsl:value-of select="/atom:feed/atom:title"/>
                </title>
                <link rel="stylesheet" href="file.[hash].css"/>
            </head>
        </html>
    </xsl:template>
</xsl:stylesheet>

😯 Current Behavior

html is not properly processed.

Actual output:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:atom="http://www.w3.org/2005/Atom">
    <xsl:output method="html" version="1.0" encoding="UTF-8" indent="yes"/>
    <xsl:template match="/">
        <html>
            <head>
                <meta name="viewport" content="width=device-width, initial-scale=1"/>
                <meta name="referrer" content="unsafe-url"/>
                <title>
                    <xsl:value-of select="/atom:feed/atom:title"/>
                </title>
                <link rel="stylesheet" href="/src/assets/scss/water/core.scss"/>
            </head>
        </html>
    </xsl:template>
</xsl:stylesheet>

💁 Possible Solution

A solution to this is probably somewhat complicated.

I tried hacking something together myself, however the main issue I ran into was that if I processed the file as if it were html, then all of the xsl-prefixed tags get removed.

🔦 Context

I'm trying to include a stylesheet in rss & atom feeds.
For example, see: https://www.rss.style/

Example feed: https://www.rss.style/example.xml?feedurl=https%3A%2F%2Fnews.ycombinator.com%2Frss

💻 Code Sample

I don't have a full code sample atm, as I'm working in a project with a lot of stuff and it's very late.
I'll provide a full code sample later (remind me if I forget)

🌍 Your Environment

Software Version(s)
Parcel 2.15.1
Node 22.15.0
npm/Yarn 4.8.1
Operating System Arch Linux 6.14.4-arch1-2 x86_64
@devongovett
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You could probably write a custom transformer plugin for this. Take a look at the XML transformer (which supports rss/atom feeds at the moment) for inspiration: https://github.com/parcel-bundler/parcel/blob/v2/packages/transformers/xml/src/XMLTransformer.js

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@devongovett @solonovamax