prune 0.1.6

prune struct
Documentation 
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#![feature(test)]
// Copyright 2019 YechaoLi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#[macro_use]
extern crate lazy_static;

pub mod trim;

pub trait Prune: IsNone {
    fn prune(self) -> Self;
}

pub trait IsNone {
    fn is_none(&self) -> bool {
        false
    }
}

impl<T> IsNone for Option<T> {
    fn is_none(&self) -> bool {
        self.is_none()
    }
}

impl<T> Prune for Option<T>
where
    T: Prune + IsNone,
{
    fn prune(self) -> Self {
        match self {
            None => None,
            Some(s) => {
                let s = s.prune();
                if s.is_none() {
                    None
                } else {
                    Some(s)
                }
            }
        }
    }
}

impl<T> IsNone for Vec<T> {}

impl<T> Prune for Vec<T>
where
    T: Prune,
{
    fn prune(self) -> Self {
        self.into_iter().map(Prune::prune).collect()
    }
}

#[derive(Debug)]
pub enum Operator {
    Trim,
    TrimStart,
    TrimEnd,
    NoWhitespace,
    Nested,
    Custom(String),
}

macro_rules! tuple_impls {
    ($(
        ($(($idx:tt)),+)
    )+) => {
        tuple_impls! {
            $(
                ($((T, $idx)),+)
            )+
        }
    };
    ($(
        ($(($T:ident, $idx:tt)),+)
    )+) => {
        $(
            impl<T> IsNone for ($($T),+) {}

            impl<T> Prune for ($($T),+) where T: Prune {
                fn prune(self) -> Self {
                    (
                        $(self.$idx.prune()),+
                    )
                }
            }
        )+
    };
}

tuple_impls! {
    ((0), (1))
    ((0), (1), (2))
    ((0), (1), (2), (3))
    ((0), (1), (2), (3), (4))
    ((0), (1), (2), (3), (4), (5))
    ((0), (1), (2), (3), (4), (5), (6))
    ((0), (1), (2), (3), (4), (5), (6), (7))
    ((0), (1), (2), (3), (4), (5), (6), (7), (8))
    ((0), (1), (2), (3), (4), (5), (6), (7), (8), (9))
    ((0), (1), (2), (3), (4), (5), (6), (7), (8), (9), (10))
    ((0), (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11))
    ((0), (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12))
}