Polsia

Polsia is a small experimental data language parser written in Rust using the chumsky parser combinator library.

Language features

• # comments
• trailing commas in arrays and objects
• unquoted identifiers as keys
• optional commas and braces for single objects
• chained keys like foo: bar: 1 for nested objects
• basic type annotations (Int, Float, String, Boolean, Any, Nothing)

Examples

# simple object without braces
foo: 1
bar: [1, 2, 3,]

# using types and chains
person: {
  name: String,
}
person: name: "Jane"

Testing

Run the formatter, lints and tests:

just test

Web playground

The playground is a small React application in the playground/ directory built with Vite. To run it locally:

just playground dev

The site will be available at the URL printed by Vite (usually http://localhost:5173/polsia/).