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/// Register selection and configuration
///
/// This is a kind a of specialized `Option<char>` for register selection.
/// Point is to keep whether the register selection has been explicitely
/// set or not while being convenient by knowing the default register name.
pub struct RegisterSelection {
selected: char,
default_name: char,
}
impl RegisterSelection {
pub fn new(default_name: char) -> Self {
Self {
selected: default_name,
default_name,
}
}
pub fn select(&mut self, name: char) {
self.selected = name;
}
pub fn take(&mut self) -> Self {
Self {
selected: std::mem::replace(&mut self.selected, self.default_name),
default_name: self.default_name,
}
}
pub fn is_default(&self) -> bool {
self.selected == self.default_name
}
pub fn name(&self) -> char {
self.selected
}
}
impl Default for RegisterSelection {
fn default() -> Self {
let default_name = '"';
Self {
selected: default_name,
default_name,
}
}
}
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