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// SPDX-FileCopyrightText: 2025 Tomasz Kramkowski <tomasz@kramkow.ski>
// SPDX-License-Identifier: GPL-3.0-or-later
pub fn topic_match(filter: &str, topic: &str) -> bool {
// TODO: Should probably just be a panic or prevented using types
if filter.is_empty() || topic.is_empty() {
return false;
}
if topic.starts_with('$') && (filter.starts_with('+') || filter.starts_with('#')) {
return false;
}
// zip_longest would be nice
let mut topic = topic.split('/');
let mut filter = filter.split('/');
loop {
let topic_level = topic.next();
return match filter.next() {
Some("#") => filter.next().is_none(),
Some("+") => {
if topic_level.is_none() {
false
} else {
continue;
}
}
Some(filter_level) => match topic_level {
Some(topic_level) if topic_level == filter_level => {
continue;
}
_ => false,
},
None => topic_level.is_none(),
};
}
}
#[cfg(test)]
mod tests {
use super::topic_match;
#[test]
fn topic_match_basic() {
assert!(topic_match("foo/bar/baz", "foo/bar/baz"));
assert!(!topic_match("foo/bar/baz", "foo/bar/qux"));
assert!(!topic_match("foo/bar", "foo/bar/baz"));
assert!(!topic_match("foo/bar/baz", "foo/bar"));
}
#[test]
fn topic_match_wildcard_hash() {
assert!(topic_match("foo/bar/baz/#", "foo/bar/baz"));
assert!(topic_match("foo/bar/baz/#", "foo/bar/baz/qux"));
assert!(topic_match("foo/bar/baz/#", "foo/bar/baz/qux/quux"));
assert!(topic_match("#", "foo/bar/baz"));
assert!(topic_match("#", "foo"));
assert!(topic_match("#", "/"));
assert!(topic_match("#", "/foo"));
assert!(!topic_match("foo/bar/#", "foo/baz/bar"));
assert!(!topic_match("foo/bar/#", "foo"));
}
#[test]
fn topic_match_wildcard_plus() {
assert!(topic_match("foo/bar/+", "foo/bar/baz"));
assert!(topic_match("foo/bar/+", "foo/bar/qux"));
assert!(!topic_match("foo/bar/+", "foo/bar/baz/qux"));
assert!(topic_match("foo/+", "foo/"));
assert!(!topic_match("foo/+", "foo"));
assert!(topic_match("+", "foo"));
assert!(topic_match("+/bar/#", "foo/bar/baz/qux"));
assert!(topic_match("+/bar/#", "qux/bar"));
assert!(topic_match("foo/+/baz", "foo/bar/baz"));
assert!(topic_match("foo/+/baz", "foo/qux/baz"));
assert!(!topic_match("foo/+/baz", "foo/bar/qux"));
assert!(topic_match("+/+", "/foo"));
assert!(topic_match("/+", "/foo"));
assert!(!topic_match("+", "/foo"));
}
#[test]
fn topic_match_dollar() {
assert!(!topic_match("#", "$foo/bar"));
assert!(!topic_match("+/bar/baz", "$foo/bar/baz"));
assert!(topic_match("$foo/#", "$foo/bar"));
assert!(topic_match("$foo/#", "$foo/bar/baz"));
assert!(topic_match("$foo/#", "$foo"));
assert!(topic_match("$foo/bar/+", "$foo/bar/baz"));
assert!(!topic_match("$foo/#", "foo/bar"));
}
#[test]
fn topic_match_edge_cases() {
assert!(!topic_match("foo", "FOO"));
assert!(topic_match("foo bar", "foo bar"));
assert!(!topic_match("foo bar", "foo bar"));
assert!(!topic_match("foo bar", "foo bar"));
assert!(!topic_match("/foo", "foo"));
assert!(!topic_match("foo", "/foo"));
assert!(topic_match("foo//bar", "foo//bar"));
assert!(!topic_match("foo/bar", "foo//bar"));
assert!(!topic_match("foo//bar", "foo/bar"));
assert!(!topic_match("foo//baz", "foo/bar/baz"));
assert!(!topic_match("foo/bar/baz", "foo//baz"));
assert!(topic_match("foo/+/baz", "foo//baz"));
assert!(topic_match("/", "/"));
assert!(!topic_match("/", "foo"));
assert!(!topic_match("foo", "/"));
assert!(!topic_match("", ""));
assert!(!topic_match("+", ""));
assert!(!topic_match("#", ""));
assert!(!topic_match("foo/#/baz", "foo/bar/baz"));
}
}
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