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