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#![no_std]

//! A macro for creating c-style u16 wide strings at compile time.
//!
//! ## Example
//! ```rust
//! use u16cstr::{u16cstr, u16str};
//! use widestring::{U16CString, U16String, U16CStr, U16Str};
//!
//! // c-style terminated wide string
//! const wide_c_string: &U16CStr = u16cstr!("Test");
//! assert_eq!(wide_c_string, U16CString::from_str("Test").unwrap().as_ucstr());
//!
//! // non-terminated wide string
//! const wide_string: &U16Str = u16str!("Test");
//! assert_eq!(wide_string, U16String::from_str("Test").as_ustr());
//! ```

pub extern crate wchar;
pub extern crate widestring;

/// A macro for creating c-style u16 wide strings at compile time.
///
/// ## Example
/// ```rust
/// use u16cstr::u16cstr;
/// use widestring::{U16CString, U16CStr};
///
/// const wide_c_string: &U16CStr = u16cstr!("Test");
/// assert_eq!(wide_c_string, U16CString::from_str("Test").unwrap().as_ucstr());
/// ```
#[macro_export]
macro_rules! u16cstr {
    ($expression:expr) => {{
        // the following would be nice to use but it is sadly not const.
        // unsafe { $crate::widestring::U16CStr::from_slice_unchecked($crate::wchar::wchz!(u16, $expression)) }

        unsafe { ::core::mem::transmute::<&'static [u16], &'static $crate::widestring::U16CStr>($crate::wchar::wchz!(u16, $expression)) }
    }};
}

/// A macro for creating u16 wide strings at compile time.
///
/// ## Example
/// ```rust
/// use u16cstr::{u16cstr, u16str};
/// use widestring::{U16String, U16Str};
///
/// const wide_string: &U16Str = u16str!("Test");
/// assert_eq!(wide_string, U16String::from_str("Test").as_ustr());
/// ```
#[macro_export]
macro_rules! u16str {
    ($expression:expr) => {{
        // the following would be nice to use but it is sadly not const.
        // unsafe { $crate::widestring::U16Str::from_slice($crate::wchar::wch!(u16, $expression)) }

        unsafe {
            ::core::mem::transmute::<&'static [u16], &'static $crate::widestring::U16Str>(
                $crate::wchar::wch!(u16, $expression),
            )
        }
    }};
}