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Ensure OptIdentifier::Multi(names) can never be empty

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a dinosaur
2025-11-01 22:25:05 +11:00
parent b846d9be6e
commit e496a8063d
2 changed files with 15 additions and 6 deletions
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19
src/option.rs
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@@ -29,29 +29,38 @@ pub struct Opt<ID> {
// TODO: Improve this interface by making the name field take AsOptIdentifier when const traits are stabilised
impl<ID> Opt<ID> {
#[inline]
const fn new(id: ID, names: OptIdentifier, value_name: Option<&'static str>, help_string: &'static str, r#type: OptType, required: bool) -> Self {
assert!(match names {
OptIdentifier::Single(_) => true,
OptIdentifier::Multi(names) => !names.is_empty(),
}, "Option names cannot be an empty slice");
Self { id, names, value_name, help_string, r#type, required }
}
/// A positional argument that is parsed sequentially without being invoked by an option flag
pub const fn positional(id: ID, name: &'static str, help_string: &'static str) -> Self {
Self { id, names: OptIdentifier::Single(name), value_name: None, help_string, r#type: OptType::Positional, required: false }
}
/// A required positional argument that is parsed sequentially without being invoked by an option flag
pub const fn positional_required(id: ID, name: &'static str, help_string: &'static str) -> Self {
Self { id, names: OptIdentifier::Single(name), value_name: None, help_string, r#type: OptType::Positional, required: true }
Self::new(id, OptIdentifier::Single(name), None, help_string, OptType::Positional, true)
}
/// A flag-type option that takes no value
pub const fn flag(id: ID, names: &'static[&'static str], help_string: &'static str) -> Self {
Self { id, names: OptIdentifier::Multi(names), value_name: None, help_string, r#type: OptType::Flag, required: false }
Self::new(id, OptIdentifier::Multi(names), None, help_string, OptType::Flag, false)
}
/// A required flag-type option that takes no value
pub const fn flag_required(id: ID, names: &'static[&'static str], help_string: &'static str) -> Self {
Self { id, names: OptIdentifier::Multi(names), value_name: None, help_string, r#type: OptType::Flag, required: true }
Self::new(id, OptIdentifier::Multi(names), None, help_string, OptType::Flag, true)
}
/// An option argument that takes a value
pub const fn value(id: ID, names: &'static[&'static str], value_name: &'static str, help_string: &'static str) -> Self {
Self { id, names: OptIdentifier::Multi(names), value_name: Some(value_name), help_string, r#type: OptType::Value, required: false }
Self::new(id, OptIdentifier::Multi(names), Some(value_name), help_string, OptType::Value, false)
}
/// A required option argument that takes a value
pub const fn value_required(id: ID, names: &'static[&'static str], value_name: &'static str, help_string: &'static str) -> Self {
Self { id, names: OptIdentifier::Multi(names), value_name: Some(value_name), help_string, r#type: OptType::Value, required: true }
Self::new(id, OptIdentifier::Multi(names), Some(value_name), help_string, OptType::Value, true)
}
}

2
src/std.rs
View File

@@ -74,7 +74,7 @@ impl Opts<&'static str> {
pub fn parse_map<'a, S: AsRef<str> + 'a, I: Iterator<Item = S>>(&self, program_name: &str, args: I,
error: impl FnOnce(&str, ParseError)) -> ParseMapResult {
let mut out: BTreeMap<&'static str, String> = BTreeMap::new();
match self.parse(&program_name, args, |program_name, id, _opt, _name, arg| {
match self.parse(&program_name, args, |_program_name, id, _opt, _name, arg| {
out.insert(id, arg.into());
Ok(ParseControl::Continue)
}, error) {