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expr: Simplify parsing a range quantifier

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Teemu Pätsi 2025-05-27 14:53:05 +03:00
parent ce0c2320ea
commit 210f4f7154
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1 changed files with 7 additions and 9 deletions
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16
src/uu/expr/src/syntax_tree.rs
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@ -282,27 +282,25 @@ fn verify_range_quantifier<I>(pattern_chars: &I) -> Result<(), ExprError>
where
I: Iterator<Item = char> + Clone,
{
// Parse the string between braces
let mut quantifier = String::new();
let mut pattern_chars_clone = pattern_chars.clone().peekable();
let Some(mut prev) = pattern_chars_clone.next() else {
return Err(ExprError::UnmatchedOpeningBrace);
};
if pattern_chars_clone.peek().is_none() {
return Err(ExprError::UnmatchedOpeningBrace);
}
let mut prev_is_escaped = false;
// Parse the string between braces
let mut quantifier = String::new();
let mut prev = '\0';
let mut curr_is_escaped = false;
while let Some(curr) = pattern_chars_clone.next() {
if prev == '\\' && curr == '}' && !prev_is_escaped {
curr_is_escaped = prev == '\\' && !curr_is_escaped;
if curr_is_escaped && curr == '}' {
break;
}
if pattern_chars_clone.peek().is_none() {
return Err(ExprError::UnmatchedOpeningBrace);
}
quantifier.push(prev);
prev_is_escaped = prev == '\\' && !prev_is_escaped;
quantifier.push(curr);
prev = curr;
}