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use crate::direction::Orientation; use std::iter; /// A generic structure with a value for each axis. #[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)] pub struct XY<T> { /// X-axis value pub x: T, /// Y-axis value pub y: T, } impl<T> IntoIterator for XY<T> { type Item = T; type IntoIter = iter::Chain<iter::Once<T>, iter::Once<T>>; /// Iterate over x, then y. fn into_iter(self) -> Self::IntoIter { iter::once(self.x).chain(iter::once(self.y)) } } impl<T> XY<T> { /// Creates a new `XY` from the given values. pub fn new(x: T, y: T) -> Self { XY { x, y } } /// Swaps the x and y values. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// assert_eq!(xy.swap(), XY::new(2, 1)); /// ``` pub fn swap(self) -> Self { XY::new(self.y, self.x) } /// Returns `f(self.x, self.y)` /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// /// assert_eq!(xy.fold(std::ops::Add::add), 3); /// assert_eq!(xy.fold(std::ops::Mul::mul), 2); /// assert_eq!(xy.fold(|x, y| x < y), true); /// ``` pub fn fold<U, F>(self, f: F) -> U where F: FnOnce(T, T) -> U, { f(self.x, self.y) } /// Creates a new `XY` by applying `f` to `x` and `y`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// /// assert_eq!(xy.map(|v| v * 2), XY::new(2, 4)); /// assert_eq!(xy.map(|v| v > 1), XY::new(false, true)); /// ``` pub fn map<U, F>(self, f: F) -> XY<U> where F: Fn(T) -> U, { XY::new(f(self.x), f(self.y)) } /// Applies `f` on axis where `condition` is true. /// /// Carries over `self` otherwise. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// let cond = XY::new(true, false); /// /// assert_eq!(xy.map_if(cond, |v| v * 3), XY::new(3, 2)); /// ``` pub fn map_if<F>(self, condition: XY<bool>, f: F) -> Self where F: Fn(T) -> T, { self.zip_map(condition, |v, c| if c { f(v) } else { v }) } /// Applies `f` on axis where `condition` is true. /// /// Returns `None` otherwise. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// let cond = XY::new(true, false); /// /// assert_eq!(xy.run_if(cond, |v| v * 3), XY::new(Some(3), None)); /// ``` pub fn run_if<F, U>(self, condition: XY<bool>, mut f: F) -> XY<Option<U>> where F: FnMut(T) -> U, { self.zip_map(condition, |v, c| if c { Some(f(v)) } else { None }) } /// Creates a new `XY` by applying `f` to `x`, and carrying `y` over. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// assert_eq!(xy.map_x(|x| x * 10), XY::new(10, 2)); /// ``` pub fn map_x<F>(self, f: F) -> Self where F: FnOnce(T) -> T, { XY::new(f(self.x), self.y) } /// Creates a new `XY` by applying `f` to `y`, and carrying `x` over. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// assert_eq!(xy.map_y(|y| y * 10), XY::new(1, 20)); /// ``` pub fn map_y<F>(self, f: F) -> Self where F: FnOnce(T) -> T, { XY::new(self.x, f(self.y)) } /// Destructure self into a pair. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// let (x, y) = xy.pair(); /// assert_eq!((x, y), (1, 2)); /// ``` pub fn pair(self) -> (T, T) { (self.x, self.y) } /// Returns a `XY` with references to this one's values. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// fn longer(xy: &XY<String>, l: usize) -> XY<bool> { /// // `XY::map` takes ownership /// // So we need to get a XY<&String> from a &XY<String> /// let by_ref: XY<&String> = xy.as_ref(); /// by_ref.map(|s| s.len() > l) /// } /// /// let xy = XY::new(String::from("a"), String::from("bbb")); /// /// assert_eq!(longer(&xy, 2), XY::new(false, true)); /// ``` pub fn as_ref(&self) -> XY<&T> { XY::new(&self.x, &self.y) } /// Returns a `XY` with mutable references to this one's values. pub fn as_ref_mut(&mut self) -> XY<&mut T> { XY::new(&mut self.x, &mut self.y) } /// Creates an iterator that returns references to `x`, then `y`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// let vec: Vec<bool> = xy.iter().map(|&i| i > 1).collect(); /// assert_eq!(vec, vec![false, true]); /// ``` pub fn iter(&self) -> iter::Chain<iter::Once<&T>, iter::Once<&T>> { iter::once(&self.x).chain(iter::once(&self.y)) } /// Returns a reference to the value on the given axis. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// # use cursive_core::direction::Orientation; /// let xy = XY::new(1, 2); /// assert_eq!(xy.get(Orientation::Horizontal), &1); /// assert_eq!(xy.get(Orientation::Vertical), &2); /// ``` pub fn get(&self, o: Orientation) -> &T { match o { Orientation::Horizontal => &self.x, Orientation::Vertical => &self.y, } } /// Returns a mutable reference to the value on the given axis. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// # use cursive_core::direction::Orientation; /// let mut xy = XY::new(1, 2); /// *xy.get_mut(Orientation::Horizontal) = 10; /// /// assert_eq!(xy, XY::new(10, 2)); /// ``` pub fn get_mut(&mut self, o: Orientation) -> &mut T { match o { Orientation::Horizontal => &mut self.x, Orientation::Vertical => &mut self.y, } } /// Returns a new `XY` of tuples made by zipping `self` and `other`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let a = XY::new(1, 2); /// let b = XY::new(true, false); /// assert_eq!(a.zip(b), XY::new((1, true), (2, false))); /// ``` pub fn zip<U>(self, other: XY<U>) -> XY<(T, U)> { XY::new((self.x, other.x), (self.y, other.y)) } /// Returns a new `XY` of tuples made by zipping `self`, `a` and `b`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let a = XY::new(1, 2); /// let b = XY::new(true, false); /// let c = XY::new("x", "y"); /// assert_eq!(a.zip3(b, c), XY::new((1, true, "x"), (2, false, "y"))); /// ``` pub fn zip3<U, V>(self, a: XY<U>, b: XY<V>) -> XY<(T, U, V)> { XY::new((self.x, a.x, b.x), (self.y, a.y, b.y)) } /// Returns a new `XY` of tuples made by zipping `self`, `a`, `b` and `c`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let a = XY::new(1, 2); /// let b = XY::new(true, false); /// let c = XY::new("x", "y"); /// let d = XY::new(vec![1], vec![2, 3, 4]); /// assert_eq!( /// XY::zip4(a, b, c, d), /// XY::new((1, true, "x", vec![1]), (2, false, "y", vec![2, 3, 4])) /// ); /// ``` pub fn zip4<U, V, W>( self, a: XY<U>, b: XY<V>, c: XY<W>, ) -> XY<(T, U, V, W)> { XY::new((self.x, a.x, b.x, c.x), (self.y, a.y, b.y, c.y)) } /// Returns a new `XY` of tuples made by zipping `self`, `a`, `b`, `c` and `d`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let a = XY::new(1, 2); /// let b = XY::new(true, false); /// let c = XY::new("x", "y"); /// let d = XY::new(vec![1], vec![2, 3, 4]); /// let e = XY::new('a', 'b'); /// /// let xy: XY<Option<char>> = /// XY::zip5(a, b, c, d, e).map(|(a, b, c, d, e)| { /// if b && d.contains(&a) { /// Some(e) /// } else { /// c.chars().next() /// } /// }); /// assert_eq!(xy, XY::new(Some('a'), Some('y'))); /// ``` pub fn zip5<U, V, W, Z>( self, a: XY<U>, b: XY<V>, c: XY<W>, d: XY<Z>, ) -> XY<(T, U, V, W, Z)> { XY::new((self.x, a.x, b.x, c.x, d.x), (self.y, a.y, b.y, c.y, d.y)) } /// Returns a new `XY` by calling `f` on `self` and `other` for each axis. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let a = XY::new((1, 10), (2, 20)); /// let b = XY::new(true, false); /// let xy = a.zip_map(b, |(a1, a2), b| if b { a1 } else { a2 }); /// assert_eq!(xy, XY::new(1, 20)); /// ``` pub fn zip_map<U, V, F>(self, other: XY<U>, mut f: F) -> XY<V> where F: FnMut(T, U) -> V, { XY::new(f(self.x, other.x), f(self.y, other.y)) } /// For each axis, keep the element from `self` if `keep` is `true`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(1, 2); /// let cond = XY::new(true, false); /// /// assert_eq!(xy.keep(cond), XY::new(Some(1), None)); /// ``` pub fn keep(self, keep: XY<bool>) -> XY<Option<T>> { keep.select(self) } } impl<T: Clone> XY<T> { /// Returns a new `XY` with the axis `o` set to `value`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// # use cursive_core::direction::Orientation; /// let xy = XY::new(1, 2).with_axis(Orientation::Horizontal, 42); /// /// assert_eq!(xy, XY::new(42, 2)); /// ``` pub fn with_axis(&self, o: Orientation, value: T) -> Self { let mut new = self.clone(); *o.get_ref(&mut new) = value; new } /// Returns a new `XY` with the axis `o` set to the value from `other`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// # use cursive_core::direction::Orientation; /// let other = XY::new(3, 4); /// let xy = XY::new(1, 2).with_axis_from(Orientation::Horizontal, &other); /// /// assert_eq!(xy, XY::new(3, 2)); /// ``` pub fn with_axis_from(&self, o: Orientation, other: &Self) -> Self { let mut new = self.clone(); new.set_axis_from(o, other); new } /// Sets the axis `o` on `self` to the value from `other`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// # use cursive_core::direction::Orientation; /// let mut xy = XY::new(1, 2); /// let other = XY::new(3, 4); /// xy.set_axis_from(Orientation::Horizontal, &other); /// /// assert_eq!(xy, XY::new(3, 2)); /// ``` pub fn set_axis_from(&mut self, o: Orientation, other: &Self) { *o.get_ref(self) = o.get(other); } /// Creates a `XY` with both `x` and `y` set to `value`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::both_from(42); /// /// assert_eq!(xy, XY::new(42, 42)); /// ``` pub fn both_from(value: T) -> Self { let x = value.clone(); let y = value; XY::new(x, y) } } impl<T> XY<Option<T>> { /// Returns a new `XY` by calling `unwrap_or` on each axis. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let xy = XY::new(Some(1), None); /// assert_eq!(xy.unwrap_or(XY::new(10, 20)), XY::new(1, 20)); /// ``` pub fn unwrap_or(self, other: XY<T>) -> XY<T> { self.zip_map(other, Option::unwrap_or) } /// Returns a new `XY` if both components are present in `self`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// assert_eq!(XY::new(Some(1), None).both(), None); /// assert_eq!(XY::new(Some(1), Some(2)).both(), Some(XY::new(1, 2))); /// ``` pub fn both(self) -> Option<XY<T>> { match self { XY { x: Some(x), y: Some(y), } => Some(XY::new(x, y)), _ => None, } } } impl XY<bool> { // Could also be called "either" /// Returns `true` if any of `x` or `y` is `true`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// assert_eq!(XY::new(true, false).any(), true); /// assert_eq!(XY::new(false, false).any(), false); /// assert_eq!(XY::new('a', 'b').map(|c| c == 'a').any(), true); /// ``` pub fn any(self) -> bool { use std::ops::BitOr; self.fold(BitOr::bitor) } // Could also be called "all" /// Returns `true` if both `x` and `y` are `true`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// assert_eq!(XY::new(true, false).both(), false); /// assert_eq!(XY::new(true, true).both(), true); /// assert_eq!(XY::new("abc", "de").map(|s| s.len() > 2).both(), false); /// ``` pub fn both(self) -> bool { use std::ops::BitAnd; self.fold(BitAnd::bitand) } /// For each axis, keeps elements from `other` if `self` is `true`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let choice = XY::new(true, false); /// let values = XY::new(1, 2); /// let selection = choice.select(values); /// /// assert_eq!(selection, XY::new(Some(1), None)); /// ``` pub fn select<T>(self, other: XY<T>) -> XY<Option<T>> { self.zip_map(other, |keep, o| if keep { Some(o) } else { None }) } /// For each axis, selects `if_true` if `self` is true, else `if_false`. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let choice = XY::new(true, false); /// let values = XY::new(1, 2); /// let fallback = XY::new(3, 4); /// let selection = choice.select_or(values, fallback); /// /// assert_eq!(selection, XY::new(1, 4)); /// ``` pub fn select_or<T>(self, if_true: XY<T>, if_false: XY<T>) -> XY<T> { self.select(if_true).unwrap_or(if_false) } /// Returns a term-by-term AND operation. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let a = XY::new(true, false); /// let b = XY::new(true, true); /// assert_eq!(a.and(b), XY::new(true, false)); /// ``` pub fn and(self, other: Self) -> Self { self.zip_map(other, |s, o| s && o) } /// Returns a term-by-term OR operation. /// /// # Examples /// /// ```rust /// # use cursive_core::XY; /// let a = XY::new(true, false); /// let b = XY::new(true, true); /// assert_eq!(a.or(b), XY::new(true, true)); /// ``` pub fn or(self, other: Self) -> Self { self.zip_map(other, |s, o| s || o) } } impl<T> From<(T, T)> for XY<T> { /// A pair is assumed to be (x, y) fn from((x, y): (T, T)) -> Self { XY::new(x, y) } } impl<T, U> From<(XY<T>, XY<U>)> for XY<(T, U)> { /// Easily zip a pair of XY into a XY of pair fn from((t, u): (XY<T>, XY<U>)) -> Self { t.zip(u) } }