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|
use mingling_picker_macros::internal_repeat;
use crate::{Pickable, Picker, PickerArgs, PickerFlag, PickerResult};
internal_repeat!(1..=32 => {
pub struct PickerPattern$<'a, (T$,+)>
where (T$: Pickable + Default,+)
{
pub args: PickerArgs<'a>,
(
pub flag_$: &'a PickerFlag<'a, T$>,
pub result_$: PickerResult<T$>,
pub default_$: Option<Box<dyn FnOnce() -> T$>>,
pub post_$: Option<Box<dyn FnOnce(T$) -> T$>>,
+)
}
});
internal_repeat!(1..=32 => {
impl<'a, (T$,+)> PickerPattern$<'a, (T$,+)>
where (T$: Pickable + Default,+)
{
/// Sets a default value provider for this flag.
///
/// If the flag is not provided by the user at runtime, the given closure will be
/// called to produce a default value. The closure is expected to return `T$`.
///
/// # Example
///
/// ```ignore
/// let pattern = picker
/// .pick(&my_flag)
/// .or(|| 42);
/// ```
#[allow(clippy::type_complexity)]
pub fn or<F>(mut self, func: F) -> Self
where
F: FnMut() -> T$,
F: 'static,
{
self.default_$ = Some(Box::new(func));
self
}
/// Attaches a post-processing function to this flag.
///
/// After the flag's value is parsed (or defaulted), the given closure will be
/// invoked with the parsed value and its return value will be used as the final
/// result. This allows transforming or validating the parsed value.
///
/// # Example
///
/// ```ignore
/// let pattern = picker
/// .pick(&my_flag)
/// .post(|val| val * 2);
/// ```
#[allow(clippy::type_complexity)]
pub fn post<F>(mut self, func: F) -> Self
where
F: FnMut(T$) -> T$,
F: 'static,
{
self.post_$ = Some(Box::new(func));
self
}
}
});
internal_repeat!(1..32 => {
impl<'a, (T$,+)> PickerPattern$<'a, (T$,+)>
where (T$: Pickable + Default,+)
{
#[allow(clippy::type_complexity)]
/// Adds a new flag to the picking chain, returning a new `PickerPattern` with one more type parameter.
///
/// This method extends the current picking pattern by appending an additional flag.
/// The previous flags and their results are preserved as part of the new pattern.
/// The new flag's result is initially `Unparsed`.
pub fn pick<N>(self, flag: &'a PickerFlag<'a, N>) -> PickerPattern$+<'a, (T$,+), N>
where
N: Pickable + Default,
{
PickerPattern$+ {
// Args
args: self.args,
// Current
flag_$+: flag,
result_$+: PickerResult::Unparsed,
default_$+: None,
post_$+: None,
// Prev
(
flag_$: self.flag_$,
result_$: self.result_$,
default_$: self.default_$,
post_$: self.post_$,
+)
}
}
}
});
impl<'a> Picker<'a> {
/// Creates a `PickerPattern1` from the given flag to start a picking chain.
///
/// This method initiates a parameter picking chain with one flag.
/// The result is initially `Unparsed`.
pub fn pick<N>(self, flag: &'a PickerFlag<'a, N>) -> PickerPattern1<'a, N>
where
N: Pickable + Default,
{
PickerPattern1 {
args: self.args,
flag_1: flag,
result_1: PickerResult::Unparsed,
default_1: None,
post_1: None,
}
}
}
|
