plantuml_encoding

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Encoding and decoding text plantuml diagrams to facilitate communication of them through URL.

Overview

Consider the next plain text plantuml diagram:

plantuml @startuml PUML -> RUST: HELLO @enduml

It can be encoded to 0IO0sVz0StHXSdHrRMmAK5LDJ20jFY1ILLDKEY18HKnCJo0AG6LkP7LjR000 and with the help of the plantuml server (https://www.plantuml.com/plantuml/uml/) it can be shared through URL.

Also, it can be decoded in the opposite direction.

Plantuml declares support for the following compression algorithms:

• deflate
• brotli
• hex

But in fact, plantuml supports only deflate (with additional transformations close to base64) and hex (with additional prefix ~h). brotli is turned off. So the crate supports only deflate and hex too.

Installation

In order to use this crate, you have to add it under [dependencies] to your Cargo.toml:

toml [dependencies] plantuml_encoding = "2.0.3"

Article

There is an article very close describing the library under the hood.

Examples

```rust use plantumlencoding::{ decodeplantumldeflate, decodeplantumlhex, encodeplantumldeflate, encodeplantuml_hex, FromPlantumlError, };

fn main() -> Result<(), FromPlantumlError> { // original puml println!("--- Original puml ---");

let puml = "@startuml\nPUML -> RUST\n@enduml";

println!("Original puml:\n{}\n", puml);

// deflate
println!("--- Deflate ---");

let encoded_deflate = encode_plantuml_deflate(puml)?;
let decoded_deflate = decode_plantuml_deflate(&encoded_deflate)?;

println!("Encoded deflate: {}", encoded_deflate);
println!("Decoded deflate:\n{}\n", decoded_deflate);

// hex
println!("--- Hex ---");

let encoded_hex = encode_plantuml_hex(puml)?;
let decoded_hex = decode_plantuml_hex(&encoded_hex)?;

println!("Encoded hex: {}", encoded_hex);
println!("Decoded hex:\n{}\n", decoded_hex);

// deflate errors
println!("--- Deflate errors ---");

let empty_encoded_deflate = "";

let decoded_deflate = decode_plantuml_deflate(empty_encoded_deflate)
    .unwrap_or_else(|_| "It's not decoded deflate".to_string());

println!("Decoded deflate error:\n{}\n", decoded_deflate);

let decoded_deflate = match decode_plantuml_deflate(empty_encoded_deflate) {
    Ok(plantuml) => plantuml,
    Err(FromPlantumlError(err)) => {
        eprintln!("Decoded deflate error: {:?}", err);
        String::from("Result from deflate error")
    }
};

println!("Match decoded deflate error result:\n{}\n", decoded_deflate);

// hex errors
println!("--- Hex errors ---");

let decoded_hex = match decode_plantuml_hex("12345") {
    Ok(plantuml) => plantuml,
    Err(FromPlantumlError(err)) => {
        eprintln!("Decoded hex error: {:?}", err);
        String::from("Result from hex error")
    }
};

println!("Match decoded hex error result:\n{}", decoded_hex);

Ok(())

} ```

And console output after cargo run for these examples:

```console --- Original puml --- Original puml: @startuml PUML -> RUST @enduml

--- Deflate --- Encoded deflate: SoWkIImgAStDuGe8zVLHqBLJ20eD3k5oICrB0Ge20000 Decoded deflate: @startuml PUML -> RUST @enduml

--- Hex --- Encoded hex: ~h407374617274756d6c0a50554d4c202d3e20525553540a40656e64756d6c Decoded hex: @startuml PUML -> RUST @enduml

--- Deflate errors --- Decoded deflate error: It's not decoded deflate

Decoded deflate error: "there is a problem during deflate decoding: deflate decompression error" Match decoded deflate error result: Result from deflate error

--- Hex errors --- Decoded hex error: "there is a problem during hex decoding: Odd number of digits" Match decoded hex error result: Result from hex error ```

Also, you can consider tests inside the files.