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//! Dialect handles, instances, and registry.

pub mod arith;
pub mod cf;
mod handle;
pub mod llvm;
mod registry;

pub use self::{handle::Handle, registry::Registry};
use crate::mlir_sys::{
    mlirDialectEqual, mlirDialectGetContext, mlirDialectGetNamespace, MlirDialect,
};
use crate::{
    context::{Context, ContextRef},
    string_ref::StringRef,
};
use std::marker::PhantomData;

/// A dialect.
#[derive(Clone, Copy, Debug)]
pub struct Dialect<'c> {
    raw: MlirDialect,
    _context: PhantomData<&'c Context>,
}

impl<'c> Dialect<'c> {
    /// Gets a context.
    pub fn context(&self) -> ContextRef<'c> {
        unsafe { ContextRef::from_raw(mlirDialectGetContext(self.raw)) }
    }

    /// Gets a namespace.
    // TODO Return &str.
    pub fn namespace(&self) -> StringRef {
        unsafe { StringRef::from_raw(mlirDialectGetNamespace(self.raw)) }
    }

    pub(crate) unsafe fn from_raw(dialect: MlirDialect) -> Self {
        Self {
            raw: dialect,
            _context: Default::default(),
        }
    }
}

impl<'c> PartialEq for Dialect<'c> {
    fn eq(&self, other: &Self) -> bool {
        unsafe { mlirDialectEqual(self.raw, other.raw) }
    }
}

impl<'c> Eq for Dialect<'c> {}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn equal() {
        let context = Context::new();

        assert_eq!(
            Handle::func().load_dialect(&context),
            Handle::func().load_dialect(&context)
        );
    }

    #[test]
    fn not_equal() {
        let context = Context::new();

        assert_ne!(
            Handle::func().load_dialect(&context),
            Handle::llvm().load_dialect(&context)
        );
    }
}