C Defines To Enum

Turn C Style #define statement into enum in Rust.

Usage

Providing exactly one enum name. And string literal with name content to generate enums from C defines.

Content could be evaluated from macros like include_str!.

This crate is crafted to use under no_std environment.

use c_defines_to_enum::parse_c_defines_to_enum;
use std::convert::TryFrom;

parse_c_defines_to_enum!(
            TestEnum,
            to_lower = true,
            content = include_str!("test.h")
        );

fn it_works() {
    println!("{:?}", TestEnum::try_from(1234));
    let value: usize = TestEnum::test1.into();
    println!("{:?} = {}", TestEnum::test1, value);
}

Result:

Ok(test1)
test1 = 1234

Support attributes

• to_lower
  • bool, turn C defines' name into lowercase.
• to_upper
  • bool, turn C defines' name into uppercase.
• remove_prefix
  • str, remove prefix of C defines' name.
• remove_suffix
  • str, remove suffix of C defines' name.

Known Issue

• Not support cascading ahead like:

#define A B
#define B 1000

• If any duplicated values detected, enum is not stored with actual value by rust. You should use trait of Into<usize>
• #[repr(usize)] and TryFrom<usize>/Into<usize> are fixed.
• Generated enum is always pub