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// --------------------------------------------------------------------------------------------
// I have to say, the code generated by this `internal_repeat!` macro is really UGLY.
//
// But I have to admit, this is a **trade-off**. To achieve the syntax of `pick().pick().pick()`
// while ensuring type safety, this is the best approach I could think of.
//
// P.S. If there's a better way, please let me know. Thanks!
// --------------------------------------------------------------------------------------------
//
// Then, I must disable `clippy::type_complexity` — this guy is way too noisy.
#![allow(clippy::type_complexity)]
use crate::{Pickable, PickerArgAttr, PickerArgInfo, PickerArgResult, PickerArgs, TagPhaseContext};
use arg_picker_macros::internal_repeat;
internal_repeat!(1..=32 => {
use crate::PickerPattern$;
use crate::PickerResult$;
});
internal_repeat!(1..=32 => {
impl<'a, (T$,+), Route> PickerPattern$<'a, (T$,+), Route>
where (T$: Pickable<'a>,+) {
/// Unwraps the result, panicking if a route was selected or a required
/// value is missing.
///
/// # Panics
///
/// Panics if a route was selected, or if a required argument was not
/// provided by the user.
pub fn unwrap(self) -> ((T$,+)) {
let p = self.parse();
((p.v$.expect(concat!("missing required argument at position ", $)),+))
}
/// Returns the parsed values, using the default values for any missing
/// required arguments, or panicking if a route was selected.
///
/// # Panics
///
/// Panics if a route was selected.
///
/// # Type Constraints
///
/// All types in the tuple must implement [`Default`].
pub fn unwrap_or_default(self) -> ((T$,+))
where
(
T$: Default,
+) {
let p = self.parse();
((p.v$.unwrap_or_default(),+))
}
/// Returns the parsed values, using the provided closure to generate
/// default values for any missing required arguments, or panicking if
/// a route was selected.
///
/// # Panics
///
/// Panics if a route was selected.
pub fn unwrap_or_else<F>(self, op: F) -> ((T$,+))
where
F: FnOnce(Route) -> ((T$,+)),
{
let r = self.to_result();
r.unwrap_or_else(op)
}
/// Returns the parsed values, or panics with the given message if
/// a route was selected.
///
/// # Panics
///
/// Panics if a route was selected, with the provided message.
///
/// # Type Constraints
///
/// `Route` must implement [`std::fmt::Debug`] so that the error
/// message can include the route value.
pub fn expect(self, msg: &str) -> ((T$,+)) where Route: std::fmt::Debug {
self.to_result().expect(msg)
}
/// Returns the individual option values without checking the route.
pub fn unpack(self) -> ((Option<T$>,+)) {
let p = self.parse();
((p.v$,+))
}
/// Converts to a `Result`, returning `Err(route)` if a route was selected,
/// or `Ok(values)` otherwise.
pub fn to_result(self) -> Result<((T$,+)), Route> {
let p = self.parse();
if let Some(r) = p.route {
return Err(r);
}
Ok(p.unwrap())
}
/// Converts to an `Option`, returning `None` if a route was selected,
/// or `Some(values)` otherwise.
pub fn to_option(self) -> Option<((T$,+))> {
let p = self.parse();
if p.route.is_some() {
return None;
}
Some(p.unwrap())
}
}
});
internal_repeat!(1..=32 => {
impl<'a, (T$,+), Route> PickerPattern$<'a, (T$,+), Route>
where (T$: Pickable<'a>,+)
{
pub fn parse(mut self) -> PickerResult$<(T$,+), Route> {
// ArgInfos
let arg_infos: [PickerArgInfo; $] = [
(
PickerArgInfo::from(self.arg_$),
+)
];
let mut bundle: [
(
// Arg Attr
PickerArgAttr,
// Tag Func
Box<dyn FnOnce(&PickerArgs<'a>, &[u8]) -> Vec<usize>>,
// Pick Func
Box<dyn FnOnce(&[&str], &mut Option<Route>)>,
// Index
usize
)
; $] = [
(
(
// Arg Attr
T$::get_attr(self.arg_$),
// Tag Func
Box::new(|args, mask| {
let ctx = TagPhaseContext {
arg_info: &arg_infos[$-],
args,
mask
};
T$::tag(ctx)
}),
// Pick Func
Box::new(|args, error_route| {
self.result_$ = match T$::pick(args) {
PickerArgResult::Parsed(mut value) => {
// Postprocess
if let Some(post) = self.post_$ {
value = post(value);
}
PickerArgResult::Parsed(value)
},
other => {
if let Some(get_default) = self.default_$ {
let mut value = get_default();
// Postprocess
if let Some(post) = self.post_$ {
value = post(value);
}
PickerArgResult::Parsed(value)
} else {
if error_route.is_none() {
if let Some(get_route) = self.route_$ {
*error_route = Some(get_route().into());
}
}
other
}
},
}
}),
// Index
$
),
+)
];
// Sort by Bundle Ord (descending)
bundle.sort_by(|a, b| b.0.cmp(&a.0));
// Mask — size = number of args (not args), so use args length
let mut mask: Vec<u8> = vec![0u8; self.args.len()];
// Parsing
for (_, tag_func, pick_func, _idx) in bundle {
// Tag phase
let tagged = tag_func(&self.args, mask.as_slice());
let mut args_to_pick: Vec<&str> = vec![];
for i in tagged {
mask[i] = 1;
// Update args to pick
args_to_pick.push(self.args.get(i).unwrap_or_default());
}
// Pick phase
pick_func(args_to_pick.as_slice(), &mut self.error_route);
}
// Combine Result
let result: PickerResult$<(T$,+), Route> = PickerResult$ {
route: self.error_route,
(
v$: self.result_$.to_option(),
+)
};
result
}
}
});
|
