127 lines
3.3 KiB
Rust
127 lines
3.3 KiB
Rust
// `Self` cannot be used where type takes generic arguments
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#![allow(clippy::use_self)]
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use crate::common::*;
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pub struct List<T: Display, I: Iterator<Item = T> + Clone> {
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conjunction: &'static str,
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values: I,
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}
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impl<T: Display, I: Iterator<Item = T> + Clone> List<T, I> {
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pub fn or<II: IntoIterator<Item = T, IntoIter = I>>(values: II) -> List<T, I> {
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List {
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conjunction: "or",
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values: values.into_iter(),
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}
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}
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pub fn and<II: IntoIterator<Item = T, IntoIter = I>>(values: II) -> List<T, I> {
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List {
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conjunction: "and",
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values: values.into_iter(),
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}
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}
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pub fn or_ticked<II: IntoIterator<Item = T, IntoIter = I>>(
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values: II,
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) -> List<Enclosure<T>, impl Iterator<Item = Enclosure<T>> + Clone> {
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List::or(values.into_iter().map(Enclosure::tick))
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}
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pub fn and_ticked<II: IntoIterator<Item = T, IntoIter = I>>(
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values: II,
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) -> List<Enclosure<T>, impl Iterator<Item = Enclosure<T>> + Clone> {
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List::and(values.into_iter().map(Enclosure::tick))
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}
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}
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impl<T: Display, I: Iterator<Item = T> + Clone> Display for List<T, I> {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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let mut values = self.values.clone().fuse();
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if let Some(first) = values.next() {
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write!(f, "{}", first)?;
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} else {
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return Ok(());
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}
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let second = values.next();
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if second.is_none() {
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return Ok(());
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}
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let third = values.next();
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if let (Some(second), None) = (second.as_ref(), third.as_ref()) {
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write!(f, " {} {}", self.conjunction, second)?;
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return Ok(());
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}
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let mut current = second;
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let mut next = third;
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loop {
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match (current, next) {
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(Some(c), Some(n)) => {
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write!(f, ", {}", c)?;
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current = Some(n);
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next = values.next();
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}
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(Some(c), None) => {
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write!(f, ", {} {}", self.conjunction, c)?;
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return Ok(());
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}
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_ => unreachable!("Iterator was fused, but returned Some after None"),
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}
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn or() {
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assert_eq!("1", List::or(&[1]).to_string());
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assert_eq!("1 or 2", List::or(&[1, 2]).to_string());
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assert_eq!("1, 2, or 3", List::or(&[1, 2, 3]).to_string());
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assert_eq!("1, 2, 3, or 4", List::or(&[1, 2, 3, 4]).to_string());
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}
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#[test]
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fn and() {
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assert_eq!("1", List::and(&[1]).to_string());
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assert_eq!("1 and 2", List::and(&[1, 2]).to_string());
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assert_eq!("1, 2, and 3", List::and(&[1, 2, 3]).to_string());
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assert_eq!("1, 2, 3, and 4", List::and(&[1, 2, 3, 4]).to_string());
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}
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#[test]
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fn or_ticked() {
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assert_eq!("`1`", List::or_ticked(&[1]).to_string());
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assert_eq!("`1` or `2`", List::or_ticked(&[1, 2]).to_string());
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assert_eq!("`1`, `2`, or `3`", List::or_ticked(&[1, 2, 3]).to_string());
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assert_eq!(
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"`1`, `2`, `3`, or `4`",
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List::or_ticked(&[1, 2, 3, 4]).to_string()
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);
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}
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#[test]
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fn and_ticked() {
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assert_eq!("`1`", List::and_ticked(&[1]).to_string());
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assert_eq!("`1` and `2`", List::and_ticked(&[1, 2]).to_string());
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assert_eq!(
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"`1`, `2`, and `3`",
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List::and_ticked(&[1, 2, 3]).to_string()
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);
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assert_eq!(
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"`1`, `2`, `3`, and `4`",
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List::and_ticked(&[1, 2, 3, 4]).to_string()
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);
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}
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}
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