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//! Helpers and duals for [`UnicodeVersionProvider`] and [`UnicodeHandling`].
//!
//! [`UnicodeHandling`]: crate::xterm::UnicodeHandling
//! [`UnicodeVersionProvider`]: crate::xterm::UnicodeVersionProvider

use super::{interface, IntoJsInterface};
use crate::xterm::{
    Str, UnicodeHandling, UnicodeVersionProvider, WideCharacterWidth,
};

interface! {
    pub trait XtermUnicodeVersionProvider mirrors UnicodeVersionProvider {
        /// Gets a string indicating the Unicode version provided.
        fn version(&self) -> Str;

        /// Unicode version dependent `wcwidth` implementation.
        fn wcwidth(&self, codepoint: u32) -> WideCharacterWidth;
    }
}

impl UnicodeHandling {
    /// Registers a [custom Unicode version provider].
    ///
    /// This supports [Rust defined providers](XtermUnicodeVersionProvider) as
    /// well as [JS defined providers](UnicodeVersionProvider) as is otherwise
    /// identical to [`UnicodeHandling::register`].
    ///
    /// [custom Unicode version provider]: XtermUnicodeVersionProvider
    pub fn register_version_provider<P>(&self, provider: &P)
    where
        P: IntoJsInterface<UnicodeVersionProvider>,
    {
        self.register(provider.by_ref())
    }
}