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use crate::{
Pickable, PickerArg, PickerArgAttr, PickerArgResult, SinglePickable, TagPhaseContext,
matcher_needed::Matcher,
parselib::{MultiArgMatcher, ParserStyle},
};
/// Boundary check for multi-value positional parameters.
pub trait BoundaryCheck {
fn check_boundary(raw: &str) -> bool;
}
/// Trait for multi-value parameters.
pub trait MultiPickableWithBoundary: Sized {
type Checker: BoundaryCheck;
fn pick_multi(raw: Vec<String>) -> PickerArgResult<Self>;
}
/// Marker: unit type that always accepts — no boundary.
pub struct NoBoundary;
impl BoundaryCheck for NoBoundary {
#[inline(always)]
fn check_boundary(_raw: &str) -> bool {
false
}
}
/// `Vec<T>` is greedy — it takes everything with `NoBoundary`.
impl<T: SinglePickable> MultiPickableWithBoundary for Vec<T> {
type Checker = NoBoundary;
fn pick_multi(raw: Vec<String>) -> PickerArgResult<Self> {
let mut result = Vec::with_capacity(raw.len());
for s in &raw {
match T::pick_single(Some(s)) {
PickerArgResult::Parsed(v) => result.push(v),
PickerArgResult::NotFound => return PickerArgResult::NotFound,
PickerArgResult::Unparsed => {}
}
}
PickerArgResult::Parsed(result)
}
}
/// If the first raw string looks like a named flag (starts with the
/// style's long or short prefix), strip it — it's the flag, not a value.
fn strip_flag<'a>(raw_strs: &'a [&'a str]) -> &'a [&'a str] {
if let Some(first) = raw_strs.first() {
let style = ParserStyle::global_style();
if first.starts_with(style.long_prefix) || first.starts_with(style.short_prefix) {
return &raw_strs[1..];
}
}
raw_strs
}
// Pickable impl for Vec<T>
impl<'a, T> Pickable<'a> for Vec<T>
where
T: SinglePickable,
{
fn get_attr(flag: &'a PickerArg<'a, Self>) -> PickerArgAttr {
PickerArgAttr::positional_or_multi(flag)
}
fn tag(ctx: TagPhaseContext) -> Vec<usize> {
MultiArgMatcher::match_all(ctx.into())
}
fn pick(raw_strs: &[&str]) -> PickerArgResult<Self> {
let strs = strip_flag(raw_strs);
let owned: Vec<String> = strs.iter().map(|&s| s.to_string()).collect();
<Vec<T> as MultiPickableWithBoundary>::pick_multi(owned)
}
}
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