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chord-progression-parser

A converter from chord progression strings to AST built in Rust that outputs wasm, so it can be used from JavaScript too.

NOTE: This library releases multiple packages. GitHub release (latest SemVer)

Example

You can try it on CodeSandbox

example gif

Documents

How to use

Rust

  • Install

    cargo add chord-progression-parser

  • And use

    use chord_progression_parser::parse_chord_progression_string;

fn main() {
  let input: &str = "
@section=Intro
[key=E]E - C#m(7) - Bm(7) - C#(7)
F#m(7) - Am(7) - F#(7) - B

@section=Verse
E - C#m(7) - Bm(7) - C#(7)
F#m(7) - Am(7) - F#(7) - B
";

    let result = parse_chord_progression_string(input);
    println!("{:#?}", result);
}

JavaScript/TypeScript (using bundler, like Vite, or If you are using Next.js)

  • Install (example, use with Vite)

    npm install @lainnao/chord-progression-parser-bundler
npm install -D vite-plugin-wasm

  • Edit vite.config.js

    import { defineConfig } from "vite";
import wasm from "vite-plugin-wasm";

export default defineConfig({
  plugins: [wasm()],
});

  • And use

    import { parseChordProgressionString } from "@lainnao/chord-progression-parser-bundler/chord_progression_parser";

const result = parseChordProgressionString("C");
console.log(result);

JavaScript/TypeScript (server like Node.js, Bun)

  • Install

    npm install @lainnao/chord-progression-parser-node

  • And use

    import { parseChordProgressionString } from "@lainnao/chord-progression-parser-node/chord_progression_parser";

const result = parseChordProgressionString("C");
console.log(result);

JavaScript(CDN)

  • index.html

    <!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <h1>load wasm directly example</h1>
    <h2>parse C</h2>
    <pre id="result"></pre>
    <script type="module">
      import * as mod from "https://cdn.jsdelivr.net/npm/@lainnao/chord-progression-parser-web@0.6.0/chord_progression_parser.js";

      (async () => {
        // initialize wasm
        await mod.default();
        // use
        const result = mod.parseChordProgressionString("C");
        console.log(result);
        document.querySelector("#result").innerHTML = JSON.stringify(
          result,
          null,
          2
        );
      })();
    </script>
  </body>
</html>

Article