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use crate::{AlignCenterLeft, AlignCenterRight, AlignLeft, AlignRight, Pad, Width};
use core::fmt::{Display, Error, Formatter};
/// Where the place the pad blocks.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Alignment {
/// Pad to the right, content to the left.
///
/// **Example:**
///
/// ```
/// # use pretty_assertions::assert_eq;
/// use zero_copy_pads::{Alignment::Left, PaddedValue, PanicOnExcess};
/// let padded_value = PaddedValue {
/// pad: Left,
/// value: "abcdef",
/// pad_block: '-',
/// total_width: 9,
/// handle_excess: PanicOnExcess,
/// };
/// assert_eq!(padded_value.to_string(), "abcdef---");
/// ```
Left,
/// Pad to the left, content to the right.
///
/// **Example:**
///
/// ```
/// # use pretty_assertions::assert_eq;
/// use zero_copy_pads::{Alignment::Right, PaddedValue, PanicOnExcess};
/// let padded_value = PaddedValue {
/// pad: Right,
/// value: "abcdef",
/// pad_block: '-',
/// total_width: 9,
/// handle_excess: PanicOnExcess,
/// };
/// assert_eq!(padded_value.to_string(), "---abcdef");
/// ```
Right,
/// Pad to both sides, place content in the middle, but shift to the left one
/// block if it can't be exactly central.
///
/// **Example:**
///
/// ```
/// # #[cfg(feature = "std")] fn main() {
/// # use pretty_assertions::assert_eq;
/// use zero_copy_pads::{Alignment::CenterLeft, PaddedColumn, PanicOnExcess};
/// let values = [
/// "Rust", "C", "C++", "C#", "JavaScript",
/// "TypeScript", "Java", "Kotlin", "Go",
/// ];
/// let padded_column = PaddedColumn {
/// pad: CenterLeft,
/// values: values.iter(),
/// pad_block: '-',
/// };
/// let padded_values: Vec<_> = padded_column
/// .into_iter()
/// .map(|x| x.to_string())
/// .collect();
/// let expected = [
/// "---Rust---", "----C-----", "---C++----",
/// "----C#----", "JavaScript", "TypeScript",
/// "---Java---", "--Kotlin--", "----Go----",
/// ];
/// assert_eq!(padded_values, expected);
/// # }
/// # #[cfg(not(feature = "std"))] fn main() {}
/// ```
CenterLeft,
/// Pad to both sides, place content in the middle, but shift to the right one
/// block if it can't be exactly central.
///
/// **Example:**
///
/// ```
/// # #[cfg(feature = "std")] fn main() {
/// # use pretty_assertions::assert_eq;
/// use zero_copy_pads::{Alignment::CenterRight, PaddedColumn, PanicOnExcess};
/// let values = [
/// "Rust", "C", "C++", "C#", "JavaScript",
/// "TypeScript", "Java", "Kotlin", "Go",
/// ];
/// let padded_column = PaddedColumn {
/// pad: CenterRight,
/// values: values.iter(),
/// pad_block: '-',
/// };
/// let padded_values: Vec<_> = padded_column
/// .into_iter()
/// .map(|x| x.to_string())
/// .collect();
/// let expected = [
/// "---Rust---", "-----C----", "----C++---",
/// "----C#----", "JavaScript", "TypeScript",
/// "---Java---", "--Kotlin--", "----Go----",
/// ];
/// assert_eq!(padded_values, expected);
/// # }
/// # #[cfg(not(feature = "std"))] fn main() {}
/// ```
CenterRight,
}
impl<Value: Width, PadBlock: Display> Pad<Value, PadBlock> for Alignment {
fn fmt(
&self,
formatter: &mut Formatter<'_>,
value: &Value,
pad_block: &PadBlock,
pad_width: usize,
) -> Result<(), Error> {
use Alignment::*;
macro_rules! call {
($name:ident) => {
$name.fmt(formatter, value, pad_block, pad_width)
};
}
match *self {
Left => call!(AlignLeft),
Right => call!(AlignRight),
CenterLeft => call!(AlignCenterLeft),
CenterRight => call!(AlignCenterRight),
}
}
}