glaredb_core 25.6.3

use std::fmt;

use super::Expression;
use crate::explain::context_display::{ContextDisplay, ContextDisplayMode, ContextDisplayWrapper};

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum IsOperator {
    IsTrue,
    IsFalse,
    IsNull,
    IsNotNull,
}

impl fmt::Display for IsOperator {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::IsTrue => write!(f, "IS TRUE"),
            Self::IsFalse => write!(f, "IS FALSE"),
            Self::IsNull => write!(f, "IS NULL"),
            Self::IsNotNull => write!(f, "IS NOT NULL"),
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct IsExpr {
    pub op: IsOperator,
    pub input: Box<Expression>,
}

impl ContextDisplay for IsExpr {
    fn fmt_using_context(
        &self,
        mode: ContextDisplayMode,
        f: &mut fmt::Formatter<'_>,
    ) -> fmt::Result {
        write!(
            f,
            "{} {}",
            ContextDisplayWrapper::with_mode(self.input.as_ref(), mode),
            self.op
        )
    }
}