https://github.com/jordy25519/casey

Case transforming macros for idents
https://github.com/jordy25519/casey

case-transforming-macros macros rust

Last synced: 2 months ago
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Case transforming macros for idents

• Host: GitHub
• URL: https://github.com/jordy25519/casey
• Owner: jordy25519
• License: mit
• Created: 2019-05-01T05:43:18.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2024-12-28T03:10:51.000Z (6 months ago)
• Last Synced: 2025-03-29T16:03:28.800Z (3 months ago)
• Topics: case-transforming-macros, macros, rust
• Language: Rust
• Size: 36.1 KB
• Stars: 39
• Watchers: 2
• Forks: 4
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE-MIT

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README

        
# Casey

[![Build](https://github.com/jordy25519/casey/actions/workflows/build.yml/badge.svg)](https://github.com/jordy25519/casey/actions/workflows/build.yml)  

Case transforming macros  

Casey transforms the case of given input `ident`s.  

Niche but maybe useful in other macros.  

```rust

use casey::{pascal, lower, shouty, snake, upper};

lower!(ABC);    // renders: `abc`

upper!(abc);    // `ABC`

snake!(ABC);    // `a_b_c`

pascal!(ab_c);  // `AbC`

shouty!(a_b_c); // `A_B_C`

```

## Token Stream

Casey macros can operate on `TokenStream`s e.g.  

```rust

    snake!(

        #[derive(PartialEq)]

        struct MockStruct {}

        impl MockStruct {

            fn test() -> bool { true }

        }

    );

    assert!(mock_struct::test());

    assert!(mock_struct::test() == mock_struct::test())

```

All `ident` tokens in the stream will have the case transformation applied (keywords and attribute macros will be ignored).  

### Gotchas

Type names, including built-in types are not considered keywords e.g. `bool`, `usize`, `i32` etc. and **will** be transformed by casey.  

```rust

pascal!(let test: bool = true); // renders: `let Test: Bool = true;`

```