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Improve Attribute doc methods #101752

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Sep 13, 2022
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Improve Attribute doc methods #101752

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12 changes: 11 additions & 1 deletion compiler/rustc_ast/src/attr/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -233,14 +233,20 @@ impl AttrItem {

impl Attribute {
/// Returns `true` if it is a sugared doc comment (`///` or `//!` for example).
/// So `#[doc = "doc"]` will return `false`.
/// So `#[doc = "doc"]` (which is a doc comment) and `#[doc(...)]` (which is not
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#[doc = "doc"] is not a doc comment, and not a comment at all, it's a doc attribute.
I'm not sure why this causes confusion, the function name tells exactly what it does.

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Because /// is a doc comment and syntactic sugar over #[doc = "..."], so the confusion is still quite strong.

/// a doc comment) will return `false`.
pub fn is_doc_comment(&self) -> bool {
match self.kind {
AttrKind::Normal(..) => false,
AttrKind::DocComment(..) => true,
}
}

/// Returns the documentation and its kind if this is a doc comment or a sugared doc comment.
/// * `///doc` returns `Some(("doc", CommentKind::Line))`.
/// * `/** doc */` returns `Some(("doc", CommentKind::Block))`.
/// * `#[doc = "doc"]` returns `Some(("doc", CommentKind::Line))`.
/// * `#[doc(...)]` returns `None`.
pub fn doc_str_and_comment_kind(&self) -> Option<(Symbol, CommentKind)> {
match self.kind {
AttrKind::DocComment(kind, data) => Some((data, kind)),
Expand All @@ -253,6 +259,10 @@ impl Attribute {
}
}

/// Returns the documentation if this is a doc comment or a sugared doc comment.
/// * `///doc` returns `Some("doc")`.
/// * `#[doc = "doc"]` returns `Some("doc")`.
/// * `#[doc(...)]` returns `None`.
pub fn doc_str(&self) -> Option<Symbol> {
match self.kind {
AttrKind::DocComment(.., data) => Some(data),
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