Tomlyn

Tomlyn is a TOML parser, validator and authoring library for .NET Framework and .NET Core.

What is TOML?

A config file format for humans. TOML aims to be a minimal configuration file format that's easy to read due to obvious semantics. TOML is designed to map unambiguously to a hash table. TOML should be easy to parse into data structures in a wide variety of languages.

• See the official website https://toml.io/en/ for more details.
• Example and specifications are available at TOML v1.0.0

Features

• Very fast parser, GC friendly.
• Compatible with the latest TOML v1.0.0 specs.
• Allow to map a TOML string to a default runtime model via Toml.ToModel(string)
• Allow to map a TOML string to a custom runtime model via Toml.ToModel<T>(string)
  • Very convenient for loading custom configurations for example.
• Allow to generate a TOML string from a runtime model via string Toml.FromModel(object)
  • Preserve comments, by default with the default runtime model, or by implementing the ITomlMetadataProvider.
• Allow to parse to a DocumentSyntax via Toml.Parse(string).
  • Preserve all spaces, new line, comments but also invalid characters/tokens.
  • Can roundtrip to text with exact representation.
• Provides a validator with the Toml.Validate method.
• Supports for .NET Standard 2.0+ and provides an API with nullable annotations.

Documentation

See the documentation for more details.

Install

Tomlyn is delivered as a NuGet Package.

Usage

var toml = @"global = ""this is a string""
# This is a comment of a table
[my_table]
key = 1 # Comment a key
value = true
list = [4, 5, 6]
";

// Parse the TOML string to the default runtime model `TomlTable`
var model = Toml.ToModel(toml);
// Fetch the string
var global = (string)model["global"]!;
// Prints: found global = "this is a string"
Console.WriteLine($"found global = \"{global}\"");
// Generates a TOML string from the model
var tomlOut = Toml.FromModel(model);
// Output the generated TOML
Console.WriteLine(tomlOut);

This will print the original TOML by preserving most the comments:

global = "this is a string"
# This is a comment of a table
[my_table]
key = 1 # Comment a key
value = true
list = [4, 5, 6]

NOTICE: By default, when mapping to a custom model, Tomlyn is using the PascalToSnakeCase naming convention (e.g ThisIsFine to this_is_fine). This behavior can be changed by overriding the TomlModelOptions.ConvertPropertyName delegate.

License

This software is released under the BSD-Clause 2 license.

Credits

Modified version of the logo Thor by Mike Rowe from the Noun Project (Creative Commons)

Author

Alexandre Mutel aka xoofx.