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use super::Navigation;
pub fn new_navigation<TOption>(
active_option: Option<TOption>,
options: Vec<TOption>,
) -> Navigation<TOption>
where
TOption: Clone + PartialEq,
{
let active_option_index = active_option.clone().map_or(Option::None, |active_option| {
options.iter().position(|option| option.eq(&active_option))
});
if let Some(active_option_index) = active_option_index {
let split = options.split_at(active_option_index);
Navigation {
options_before_active: split.0.to_vec(),
active_option,
options_after_active: split.1.split_at(1).1.to_vec(),
}
} else {
Navigation {
options_before_active: options,
active_option,
options_after_active: vec![],
}
}
}
#[cfg(test)]
mod test {
use super::Navigation;
#[test]
fn when_active_option_at_start_of_options_then_finds_active_option() {
let navigation = Navigation::new(Some(1), vec![1, 2, 3, 4, 5]);
assert_eq!(Vec::<i32>::new(), navigation.options_before_active);
assert_eq!(Some(1), navigation.active_option);
assert_eq!(vec![2, 3, 4, 5], navigation.options_after_active);
}
#[test]
fn when_active_option_in_middle_of_options_then_finds_active_option() {
let navigation = Navigation::new(Some(3), vec![1, 2, 3, 4, 5]);
assert_eq!(vec![1, 2], navigation.options_before_active);
assert_eq!(Some(3), navigation.active_option);
assert_eq!(vec![4, 5], navigation.options_after_active);
}
#[test]
fn when_active_option_at_end_of_options_then_finds_active_option() {
let navigation = Navigation::new(Some(5), vec![1, 2, 3, 4, 5]);
assert_eq!(vec![1, 2, 3, 4], navigation.options_before_active);
assert_eq!(Some(5), navigation.active_option);
assert_eq!(Vec::<i32>::new(), navigation.options_after_active);
}
#[test]
fn when_active_option_not_in_options_then_appends_active_option() {
let navigation = Navigation::new(Some(6), vec![1, 2, 3, 4, 5]);
assert_eq!(vec![1, 2, 3, 4, 5], navigation.options_before_active);
assert_eq!(Some(6), navigation.active_option);
assert_eq!(Vec::<i32>::new(), navigation.options_after_active);
}
#[test]
fn when_no_active_option_then_all_options_are_before_active_option() {
let navigation = Navigation::new(None, vec![1, 2, 3, 4, 5]);
assert_eq!(vec![1, 2, 3, 4, 5], navigation.options_before_active);
assert_eq!(None, navigation.active_option);
assert_eq!(Vec::<i32>::new(), navigation.options_after_active);
}
}
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