Nabla

Warning: Work in Progress

Nabla is a statically typed configuration language. It aimes to be developer-friendly and human-readable, while compiling to machine-readable formats like JSON, XML and YAML.

Example

Let's define our configuration options for an example program. Our program takes a mandatory input file. Furthermore, an output folder and the used version can be supplied. But the latter two are optional because default values are provided. Also note that only version 1 and 2 are possible values. Specifying version 3 (or any other number) would lead to an error.

def Config = {
    input_file: String
    output_folder: String = "out/"
    version: 1 | 2 = 2
}

The config could be instantiated as follows. The mandatory input file is supplied and the default output folder is overwritten.

Config {
    input_file = "input.txt"
    output_folder = "build/"
}

Nabla can then compile the result to the following JSON. Since no version was specified, it will fall back on the default value for this key.

{
    "input_file": "input.txt",
    "output_folder": "build/",
    "version": 2
}

Supported Targets

• JSON
• YAML
• XML
• TOML