Ron

Ron, aka Rusty Object Notation, is a data notation created in 2015 by Juniper Tyree.

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RON is a simple readable data serialization format that looks similar to Rust syntax. It's designed to support all of Serde's data model, so structs, enums, tuples, arrays, generic maps, and primitive values.

Ron is developed on GitHub and has 2,045 stars
Ron first developed in https://github.com/ron-rs
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Example from the web:

GameConfig( // optional struct name
    window_size: (800, 600),
    window_title: "PAC-MAN",
    fullscreen: false,
    
    mouse_sensitivity: 1.4,
    key_bindings: {
        "up": Up,
        "down": Down,
        "left": Left,
        "right": Right,
        
        // Uncomment to enable WASD controls
        /*
        "W": Up,
        "A": Down,
        "S": Left,
        "D": Right,
        */
    },
    
    difficulty_options: (
        start_difficulty: Easy,
        adaptive: false,
    ),
)

Feature	Supported	Token	Example
MultiLine Comments	✓	/* */	/* A comment */
Comments	✓		// A comment
Line Comments	✓	//	// A comment
Semantic Indentation	X

Ron - Data notation

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