Refuse to translate if set2 contains > 1 unique characters

src/uu/tr/src/operation.rs

@@ -35,6 +35,7 @@ pub enum BadSequence {
  EmptySet2WhenNotTruncatingSet1,
  ClassExceptLowerUpperInSet2,
  ClassInSet2NotMatchedBySet1,
+ ComplementMoreThanOneUniqueInSet2,
 }
 
 impl Display for BadSequence {
@@ -62,6 +63,9 @@ impl Display for BadSequence {
  Self::ClassInSet2NotMatchedBySet1 => {
  write!(f, "when translating, every 'upper'/'lower' in set2 must be matched by a 'upper'/'lower' in the same position in set1")
  }
+ Self::ComplementMoreThanOneUniqueInSet2 => {
+ write!(f, "when translating with complemented character classes,\nstring2 must map all characters in the domain to one")
+ }
  }
  }
 }
@@ -220,7 +224,6 @@ impl Sequence {
  .count();
 
  let star_compensate_len = set1_len.saturating_sub(set2_len);
-
  //Replace CharStar with CharRepeat
  set2 = set2
  .iter()
@@ -258,6 +261,17 @@ impl Sequence {
  .flat_map(Self::flatten_all)
  .filter_map(to_u8)
  .collect();
+ let mut set2_uniques = set2_solved.clone();
+ set2_uniques.sort();
+ set2_uniques.dedup();
+
+ if set1.iter().any(|x| matches!(x, Self::Class(_)))
+ && translating
+ && complement_flag
+ && set2_uniques.len() > 1
+ {
+ return Err(BadSequence::ComplementMoreThanOneUniqueInSet2);
+ }
 
  //Truncation is done dead last. It has no influence on the other conversion steps
  if truncate_set1_flag {