Bacon

A toy programming language for building web APIs in Norwegian Bokmål.

Inspired by Brunost which a colleague shared. Another colleague joked we should make our own called Bacon, and I may or may not have taken it a little bit too seriously.

Status

Bacon is a working programming language with web API support. Programs run as console apps or as HTTP servers serving JSON APIs.

Try a console program

dotnet run --project src/Bacon.Cli/Bacon.Cli.csproj examples/hello.bacon
dotnet run --project src/Bacon.Cli/Bacon.Cli.csproj examples/fakultet.bacon
dotnet run --project src/Bacon.Cli/Bacon.Cli.csproj examples/bil.bacon

Try the web API

dotnet run --project src/Bacon.Cli/Bacon.Cli.csproj -- --serve examples/bil_api.bacon

In another terminal:

curl http://localhost:5000/bil/123
# {"id":"123","modell":"Volvo V40","årsmodell":2018}

Example: web API

besetning Bil {
    fast id : tekst
    fast modell : tekst
    fast årsmodell : heltall
}

prosess hent_bil(bil_id) {
    leverer Bil(bil_id, "Volvo V40", 2018)
}

rute GET "/bil/{id}" {
    leverer hent_bil(parameter.id)
}

Documentation

See LANGUAGE.md for full syntax reference.

What's done

• Lexer with multi-word operators (større enn, er ikke, etc.)
• Recursive descent parser with Pratt-style expression precedence
• AST nodes for the full language
• AstPrinter for debugging
• Tree-walker evaluator with lexical scoping and closures
• User-defined types (besetning) with field immutability
• Builtin functions: skriv, lengde, til_tekst
• ASP.NET web runtime with route mapping and JSON responses
• Path parameters via parameter.x syntax
• CLI for running and serving .bacon files
• 100+ unit tests

What's next

• Status codes (leverer status 404)
• Body binding (mottar data : NyBil)
• Query parameters
• Named constructor arguments (Bil(id: "1", modell: "Volvo"))
• String escapes (\n, \t)
• More stdlib functions

Project structure

src/
    Bacon.Compiler/       Lexer, parser, AST, evaluator
    Bacon.Web/            ASP.NET integration
    Bacon.Cli/            CLI for running and serving .bacon files
    tests/
        Bacon.Compiler.Tests/ xUnit tests
examples/               Sample Bacon programs

Build

dotnet build
dotnet test