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use std::marker::PhantomData;
use std::ops::{Deref, DerefMut};
use crate::{
BoundaryCheck, MultiPickableWithBoundary, Pickable, PickerArg, PickerArgAttr, PickerArgResult,
SinglePickable, TagPhaseContext,
matcher_needed::Matcher,
parselib::{MultiArgMatcher, ParserStyle},
};
/// A `Vec`-like container that stops collecting when [`BoundaryCheck`]
/// returns `true`.
///
/// This type exists to signal "I know what I'm doing with boundaries"
/// at the type level (as opposed to `Vec<T>` which greedily takes
/// everything).
#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct VecUntil<T> {
pub(crate) inner: Vec<T>,
_marker: PhantomData<T>,
}
impl<T> VecUntil<T> {
pub fn into_inner(self) -> Vec<T> {
self.inner
}
}
impl<T> From<Vec<T>> for VecUntil<T> {
fn from(v: Vec<T>) -> Self {
VecUntil {
inner: v,
_marker: PhantomData,
}
}
}
impl<T> From<VecUntil<T>> for Vec<T> {
fn from(v: VecUntil<T>) -> Self {
v.inner
}
}
impl<T> Deref for VecUntil<T> {
type Target = Vec<T>;
fn deref(&self) -> &Vec<T> {
&self.inner
}
}
impl<T> DerefMut for VecUntil<T> {
fn deref_mut(&mut self) -> &mut Vec<T> {
&mut self.inner
}
}
// MultiPickableWithBoundary impl
impl<T> MultiPickableWithBoundary for VecUntil<T>
where
T: SinglePickable + BoundaryCheck,
{
type Checker = T;
fn pick_multi(raw: Vec<String>) -> PickerArgResult<Self> {
let mut inner = Vec::with_capacity(raw.len());
for s in &raw {
match T::pick_single(Some(s)) {
PickerArgResult::Parsed(v) => inner.push(v),
PickerArgResult::NotFound => return PickerArgResult::NotFound,
PickerArgResult::Unparsed => {}
}
}
PickerArgResult::Parsed(VecUntil {
inner,
_marker: PhantomData,
})
}
}
// Pickable impl
impl<'a, T> Pickable<'a> for VecUntil<T>
where
T: SinglePickable + BoundaryCheck,
{
fn get_attr(flag: &'a PickerArg<'a, Self>) -> PickerArgAttr {
PickerArgAttr::positional_or_multi(flag)
}
fn tag(ctx: TagPhaseContext) -> Vec<usize> {
let args = ctx.args;
let is_positional = ctx.arg_info.positional;
let positions = MultiArgMatcher::match_all(ctx.into());
if positions.is_empty() {
return positions;
}
let start = if is_positional { 0 } else { 1 };
if start >= positions.len() {
return positions;
}
let mut cut = start;
for &idx in &positions[start..] {
if let Some(raw) = args.get(idx)
&& T::check_boundary(raw)
{
break;
}
cut += 1;
}
positions[..cut].to_vec()
}
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();
<VecUntil<T> as MultiPickableWithBoundary>::pick_multi(owned)
}
}
/// 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
}
|
