Markdown Support

[suxin2017]

markdown is also already in prettify and is what you need.

So our markdown support is also important, using this pr to support basic markdown

For now, I'm going to use this ebnf syntax and see if I can match it with prettify later.

https://www.mediawiki.org/wiki/Markup_spec/EBNF

Why not an existing library?

Because converting from an existing ast to biome's cst and ast is tedious and not always possible, just like the css implementation, we can achieve a more fine-grained improvement by doing it ourselves.

This pr only implements the ast part of markdown, we will add support for format/lint when the ast part is stable

#3718

Reference Links

https://www.mediawiki.org/wiki/Markup_spec/EBNF

https://github.github.com/gfm/

https://github.com/syntax-tree/mdast

https://commonmark.org/

Progress tracking

• project struct init feat(markdown): support markdown grammar code generation #3775

  • grammer support
  • support commonmark grammer defined

• grammer implementation

  • block

    • leaf block
    • 4.1Thematic breaks feat(markdown/parser): support thematic break block parser #3982
    • 4.2ATX headings
    • 4.3Setext headings
    • 4.4Indented code blocks
    • 4.5Fenced code blocks
    • 4.6HTML blocks
    • 4.7Link reference definitions
    • 4.8Paragraphs
    • 4.9Blank lines
    • container bloock
    • 5.1Block quotes
    • 5.2List items
    • 5.3Lists

  • inline block

    • 6.1Code spans
    • 6.2Emphasis and strong emphasis
    • 6.3Links
    • 6.4Images
    • 6.5Autolinks
    • 6.6Raw HTML
    • 6.7Hard line breaks
    • 6.8Soft line breaks
    • 6.9Textual content
    • Appendix: A parsing strategy

• extension support

  • gfm support

[Conaclos]

Are we aiming for compliance to the CommonMark spec?

[suxin2017]

The ultimate goal is to finish making commonmark spec at https://github.github.com/gfm/