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use crate::{CodeBuffer, Expression};

/// An element with expression parameters.
pub trait WithParams {
    /// Gets the parameters.
    fn params(&self) -> &[Box<dyn Expression>];

    /// Adds the parameter.
    fn with_param<P>(self, param: P) -> Self
    where
        P: 'static + Expression;

    /// Adds the parameter.
    fn add_param<P>(&mut self, param: P)
    where
        P: 'static + Expression;

    /// Writes the parameters.
    fn write_params(&self, b: &mut CodeBuffer) {
        if let Some((first, rest)) = self.params().split_first() {
            first.write(b);
            for param in rest {
                b.write(", ");
                param.write(b);
            }
        }
    }

    /// Writes the parameters with parentheses.
    fn write_params_with_parens(&self, b: &mut CodeBuffer) {
        b.write("(");
        self.write_params(b);
        b.write(")");
    }
}