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expr: Handle special cases for $ in regex

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Enable fixed test `test_bre11`
This commit is contained in:
Teemu Pätsi 2025-05-23 15:24:17 +03:00
parent f664578a4b
commit 29332865a9
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2 changed files with 34 additions and 4 deletions
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25
src/uu/expr/src/syntax_tree.rs
View file

@ -156,7 +156,7 @@ impl StringOp {
re_string.push('^');
// Handle first character from the input pattern
let mut pattern_chars = right.chars();
let mut pattern_chars = right.chars().peekable();
let first = pattern_chars.next();
match first {
Some('^') => {} // Start of string anchor is already added
@ -166,10 +166,9 @@ impl StringOp {
};
// Handle the rest of the input pattern.
// Escaped previous character should not affect the current.
let mut prev = first.unwrap_or_default();
let mut prev_is_escaped = false;
for curr in pattern_chars {
while let Some(curr) = pattern_chars.next() {
match curr {
'^' => match (prev, prev_is_escaped) {
// Start of a capturing group
@ -181,6 +180,26 @@ impl StringOp {
// Explicitly escaped caret
| ('\\', false) => re_string.push(curr),
_ => re_string.push_str(r"\^"),
},
'$' => {
if let Some('\\') = pattern_chars.peek() {
// The next character was checked to be a backslash
let backslash = pattern_chars.next().unwrap_or_default();
match pattern_chars.peek() {
// End of a capturing group
Some(')') => re_string.push('$'),
// End of an alternative pattern
Some('|') => re_string.push('$'),
_ => re_string.push_str(r"\$"),
}
re_string.push(backslash);
} else if (prev_is_escaped || prev != '\\')
&& pattern_chars.peek().is_some()
{
re_string.push_str(r"\$");
} else {
re_string.push('$');
}
}
_ => re_string.push(curr),
}

13
tests/by-util/test_expr.rs
View file

@ -294,6 +294,14 @@ fn test_regex() {
.args(&["a$b", ":", "a\\$b"])
.succeeds()
.stdout_only("3\n");
new_ucmd!()
.args(&["a", ":", "a$\\|b"])
.succeeds()
.stdout_only("1\n");
new_ucmd!()
.args(&["ab", ":", "a\\(b$\\)"])
.succeeds()
.stdout_only("b\n");
new_ucmd!()
.args(&["abc", ":", "^abc"])
.succeeds()
@ -306,6 +314,10 @@ fn test_regex() {
.args(&["b^$ic", ":", "b^\\$ic"])
.succeeds()
.stdout_only("5\n");
new_ucmd!()
.args(&["a$c", ":", "a$\\c"])
.succeeds()
.stdout_only("3\n");
new_ucmd!()
.args(&["^^^^^^^^^", ":", "^^^"])
.succeeds()
@ -774,7 +786,6 @@ mod gnu_expr {
.stdout_only("3\n");
}
#[ignore]
#[test]
fn test_bre11() {
new_ucmd!()