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/// Result of checking `mlint(allow/warn/deny(...))` attributes.
#[derive(Clone, Copy, PartialEq, Eq)]
pub enum MlintLevelOverride {
Allow,
Warn,
Deny,
}
/// Parse `mlint(allow/warn/deny(lint_name))` from attributes.
/// Returns `None` if the lint is not mentioned in any mlint attribute.
pub fn get_mlint_override(attrs: &[syn::Attribute], lint_name: &str) -> Option<MlintLevelOverride> {
for attr in attrs {
if !attr.path().is_ident("mlint") {
continue;
}
let list = match attr.meta.require_list() {
Ok(l) => l,
Err(_) => continue,
};
// TokenStream::to_string() adds spaces between tokens,
// e.g. `allow(xxx)` → `allow ( xxx )`. Remove all spaces to compare.
let flat: String = list
.tokens
.to_string()
.chars()
.filter(|c| !c.is_whitespace())
.collect();
for (keyword, variant) in [
("allow", MlintLevelOverride::Allow),
("warn", MlintLevelOverride::Warn),
("deny", MlintLevelOverride::Deny),
] {
if flat.contains(&format!("{keyword}({lint_name})")) {
return Some(variant);
}
}
}
None
}
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