Building a single-pass rich-text DSL parser (no regex)

I built this while trying to replace Markdown in my personal blog. Markdown is convenient, but once you start adding custom syntax, parsing rules quickly become hard to reason about. I wanted something with: predictable parsing behavior nested structures without ambiguity extensible semantics minimal syntax surface So instead of a regex-driven approach, I implemented a single-pass recursive descent parser with no backtracking. The parser handles three forms — inline, block, and raw — all using the same core state machine. For example: $bold(hello)$ $info()* This is a block tag *end$ Handlers are pluggable, so the grammar stays small while behavior is defined externally. This keeps the parser focused on structure, not rendering. The result is a lightweight DSL that works well for structured rich text, especially in static site generators or blog engines. GitHub: https://github.com/chiba233/yumeDSL npm: https://www.npmjs.com/package/yume-dsl-rich-text demo: https://qwwq.org/blog/dsl-