lezer-markdown

This is an incremental Markdown (CommonMark with support for extension) parser that integrates well with the Lezer parser system. It does not in fact use the Lezer runtime (that runs LR parsers, and Markdown can't really be parsed that way), but it produces Lezer-style compact syntax trees and consumes fragments of such trees for its incremental parsing.

Note that this only parses the document, producing a data structure that represents its syntactic form, and doesn't help with outputting HTML. Also, in order to be single-pass and incremental, it doesn't do some things that a conforming CommonMark parser is expected to do—specifically, it doesn't validate link references, so it'll parse [a][b] and similar as a link, even if no [b] reference is declared.

The @codemirror/lang-markdown package integrates this parser with CodeMirror to provide Markdown editor support.

The code is licensed under an MIT license.

Interface

GitHub Flavored Markdown

Other extensions

Extension

The parser can, to a certain extent, be extended to handle additional syntax.