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//! Macros for use with the Moniker library

/// Assert that two expressions are alpha equivalent to each other (using
/// `BoundTerm::term_eq`).
///
/// On panic, this macro will print the values of the expressions with their
/// debug representations.
///
/// Like `assert!`, this macro has a second form, where a custom
/// panic message can be provided.
#[macro_export]
macro_rules! assert_term_eq {
    ($left:expr, $right:expr) => ({
        match (&$left, &$right) {
            (left_val, right_val) => {
                if !::moniker::BoundTerm::term_eq(left_val, right_val) {
                    panic!(r#"assertion failed: `<_>::term_eq(&left, &right)`
  left: `{:?}`,
 right: `{:?}`"#, left_val, right_val)
                }
            }
        }
    });
    ($left:expr, $right:expr,) => ({
        assert_term_eq!($left, $right)
    });
    ($left:expr, $right:expr, $($arg:tt)+) => ({
        match (&($left), &($right)) {
            (left_val, right_val) => {
                if !::moniker::BoundTerm::term_eq(left_val, right_val) {
                    panic!(r#"assertion failed: `<_>::term_eq(&left, &right)`
  left: `{:?}`,
 right: `{:?}`: {}"#, left_val, right_val,
                           format_args!($($arg)+))
                }
            }
        }
    });
}

/// Assert that two expressions are alpha equivalent to each other (using
/// `BoundPattern::pattern_eq`).
///
/// On panic, this macro will print the values of the expressions with their
/// debug representations.
///
/// Like `assert!`, this macro has a second form, where a custom
/// panic message can be provided.
#[macro_export]
macro_rules! assert_pattern_eq {
    ($left:expr, $right:expr) => ({
        match (&$left, &$right) {
            (left_val, right_val) => {
                if !::moniker::BoundPattern::pattern_eq(left_val, right_val) {
                    panic!(r#"assertion failed: `<_>::pattern_eq(&left, &right)`
  left: `{:?}`,
 right: `{:?}`"#, left_val, right_val)
                }
            }
        }
    });
    ($left:expr, $right:expr,) => ({
        assert_pattern_eq!($left, $right)
    });
    ($left:expr, $right:expr, $($arg:tt)+) => ({
        match (&($left), &($right)) {
            (left_val, right_val) => {
                if !::moniker::BoundPattern::pattern_eq(left_val, right_val) {
                    panic!(r#"assertion failed: `<_>::pattern_eq(&left, &right)`
  left: `{:?}`,
 right: `{:?}`: {}"#, left_val, right_val,
                           format_args!($($arg)+))
                }
            }
        }
    });
}