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expr: fix panic for "empty substitution" test case

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This commit is contained in:
Joseph Jon Booker 2024-03-25 22:03:26 -05:00
parent aa010b71b8
commit 0ba9a301b0
1 changed files with 11 additions and 1 deletions
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12
src/uu/expr/src/syntax_tree.rs
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@ -148,7 +148,7 @@ impl StringOp {
.map_err(|_| ExprError::InvalidRegexExpression)?; .map_err(|_| ExprError::InvalidRegexExpression)?;
Ok(if re.captures_len() > 0 { Ok(if re.captures_len() > 0 {
re.captures(&left) re.captures(&left)
.map(|captures| captures.at(1).unwrap()) .and_then(|captures| captures.at(1))
.unwrap_or("") .unwrap_or("")
.to_string() .to_string()
} else { } else {
@ -609,4 +609,14 @@ mod test {
Err(ExprError::ExpectedClosingBraceInsteadOf("a".to_string())) Err(ExprError::ExpectedClosingBraceInsteadOf("a".to_string()))
); );
} }
#[test]
fn empty_substitution() {
// causes a panic in 0.0.25
let result = AstNode::parse(&["a", ":", r"\(b\)*"])
.unwrap()
.eval()
.unwrap();
assert_eq!(result.eval_as_string(), "");
}
} }