Adjust rustdoc for literal boolean support

src/librustdoc/clean/cfg.rs

@@ -6,7 +6,7 @@
 use std::fmt::{self, Write};
 use std::{mem, ops};
 
-use rustc_ast::{LitKind, MetaItem, MetaItemKind, NestedMetaItem};
+use rustc_ast::{LitKind, MetaItem, MetaItemKind, MetaItemLit, NestedMetaItem};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_feature::Features;
 use rustc_session::parse::ParseSess;
@@ -48,6 +48,10 @@ fn parse_nested(
     ) -> Result<Option<Cfg>, InvalidCfgError> {
         match nested_cfg {
             NestedMetaItem::MetaItem(ref cfg) => Cfg::parse_without(cfg, exclude),
+            NestedMetaItem::Lit(MetaItemLit { kind: LitKind::Bool(b), .. }) => match *b {
+                true => Ok(Some(Cfg::True)),
+                false => Ok(Some(Cfg::False)),
+            },
             NestedMetaItem::Lit(ref lit) => {
                 Err(InvalidCfgError { msg: "unexpected literal", span: lit.span })
             }
@@ -120,8 +124,8 @@ pub(crate) fn parse_without(
     ///
     /// If the content is not properly formatted, it will return an error indicating what and where
     /// the error is.
-    pub(crate) fn parse(cfg: &MetaItem) -> Result<Cfg, InvalidCfgError> {
-        Self::parse_without(cfg, &FxHashSet::default()).map(|ret| ret.unwrap())
+    pub(crate) fn parse(cfg: &NestedMetaItem) -> Result<Cfg, InvalidCfgError> {
+        Self::parse_nested(cfg, &FxHashSet::default()).map(|ret| ret.unwrap())
     }
 
     /// Checks whether the given configuration can be matched in the current session.

src/librustdoc/clean/cfg/tests.rs

@@ -1,4 +1,5 @@
-use rustc_ast::{MetaItemLit, Path, Safety, StrStyle};
+use rustc_ast::ast::LitIntType;
+use rustc_ast::{MetaItemLit, NestedMetaItem, Path, Safety, StrStyle};
 use rustc_span::symbol::{Ident, kw};
 use rustc_span::{DUMMY_SP, create_default_session_globals_then};
 use thin_vec::thin_vec;
@@ -13,52 +14,52 @@ fn name_value_cfg(name: &str, value: &str) -> Cfg {
     Cfg::Cfg(Symbol::intern(name), Some(Symbol::intern(value)))
 }
 
-fn dummy_meta_item_word(name: &str) -> MetaItem {
-    MetaItem {
+fn dummy_lit(symbol: Symbol, kind: LitKind) -> NestedMetaItem {
+    NestedMetaItem::Lit(MetaItemLit { symbol, suffix: None, kind, span: DUMMY_SP })
+}
+
+fn dummy_meta_item_word(name: &str) -> NestedMetaItem {
+    NestedMetaItem::MetaItem(MetaItem {
         unsafety: Safety::Default,
         path: Path::from_ident(Ident::from_str(name)),
         kind: MetaItemKind::Word,
         span: DUMMY_SP,
-    }
+    })
 }
 
-fn dummy_meta_item_name_value(name: &str, symbol: Symbol, kind: LitKind) -> MetaItem {
+fn dummy_meta_item_name_value(name: &str, symbol: Symbol, kind: LitKind) -> NestedMetaItem {
     let lit = MetaItemLit { symbol, suffix: None, kind, span: DUMMY_SP };
-    MetaItem {
+    NestedMetaItem::MetaItem(MetaItem {
         unsafety: Safety::Default,
         path: Path::from_ident(Ident::from_str(name)),
         kind: MetaItemKind::NameValue(lit),
         span: DUMMY_SP,
-    }
+    })
 }
 
 macro_rules! dummy_meta_item_list {
     ($name:ident, [$($list:ident),* $(,)?]) => {
-        MetaItem {
+        NestedMetaItem::MetaItem(MetaItem {
             unsafety: Safety::Default,
             path: Path::from_ident(Ident::from_str(stringify!($name))),
             kind: MetaItemKind::List(thin_vec![
                 $(
-                    NestedMetaItem::MetaItem(
-                        dummy_meta_item_word(stringify!($list)),
-                    ),
+                    dummy_meta_item_word(stringify!($list)),
                 )*
             ]),
             span: DUMMY_SP,
-        }
+        })
     };
 
     ($name:ident, [$($list:expr),* $(,)?]) => {
-        MetaItem {
+        NestedMetaItem::MetaItem(MetaItem {
             unsafety: Safety::Default,
             path: Path::from_ident(Ident::from_str(stringify!($name))),
             kind: MetaItemKind::List(thin_vec![
-                $(
-                    NestedMetaItem::MetaItem($list),
-                )*
+                $($list,)*
             ]),
             span: DUMMY_SP,
-        }
+        })
     };
 }
 
@@ -251,6 +252,14 @@ fn test_cfg_or() {
 #[test]
 fn test_parse_ok() {
     create_default_session_globals_then(|| {
+        let r#true = Symbol::intern("true");
+        let mi = dummy_lit(r#true, LitKind::Bool(true));
+        assert_eq!(Cfg::parse(&mi), Ok(Cfg::True));
+
+        let r#false = Symbol::intern("false");
+        let mi = dummy_lit(r#false, LitKind::Bool(false));
+        assert_eq!(Cfg::parse(&mi), Ok(Cfg::False));
+
         let mi = dummy_meta_item_word("all");
         assert_eq!(Cfg::parse(&mi), Ok(word_cfg("all")));
 
@@ -309,6 +318,14 @@ fn test_parse_err() {
 
         let mi = dummy_meta_item_list!(not, [dummy_meta_item_list!(foo, []),]);
         assert!(Cfg::parse(&mi).is_err());
+
+        let c = Symbol::intern("e");
+        let mi = dummy_lit(c, LitKind::Char('e'));
+        assert!(Cfg::parse(&mi).is_err());
+
+        let five = Symbol::intern("5");
+        let mi = dummy_lit(five, LitKind::Int(5.into(), LitIntType::Unsuffixed));
+        assert!(Cfg::parse(&mi).is_err());
     })
 }
 

src/librustdoc/clean/types.rs

@@ -5,6 +5,7 @@
 use std::{fmt, iter};
 
 use arrayvec::ArrayVec;
+use rustc_ast::NestedMetaItem;
 use rustc_ast_pretty::pprust;
 use rustc_attr::{ConstStability, Deprecation, Stability, StabilityLevel, StableSince};
 use rustc_const_eval::const_eval::is_unstable_const_fn;
@@ -1016,7 +1017,7 @@ fn single<T: IntoIterator>(it: T) -> Option<T::Item> {
                 .peekable();
             if doc_cfg.peek().is_some() && doc_cfg_active {
                 doc_cfg
-                    .filter_map(|attr| Cfg::parse(attr.meta_item()?).ok())
+                    .filter_map(|attr| Cfg::parse(&attr).ok())
                     .fold(Cfg::True, |cfg, new_cfg| cfg & new_cfg)
             } else if doc_auto_cfg_active {
                 // If there is no `doc(cfg())`, then we retrieve the `cfg()` attributes (because
@@ -1072,7 +1073,7 @@ fn single<T: IntoIterator>(it: T) -> Option<T::Item> {
                     let mut meta = attr.meta_item().unwrap().clone();
                     meta.path = ast::Path::from_ident(Ident::with_dummy_span(sym::target_feature));
 
-                    if let Ok(feat_cfg) = Cfg::parse(&meta) {
+                    if let Ok(feat_cfg) = Cfg::parse(&NestedMetaItem::MetaItem(meta)) {
                         cfg &= feat_cfg;
                     }
                 }

src/librustdoc/visit_ast.rs

@@ -164,7 +164,7 @@ pub(crate) fn visit(mut self) -> Module<'tcx> {
                     .unwrap_or(&[])
                     .iter()
                     .filter_map(|attr| {
-                        Cfg::parse(attr.meta_item()?)
+                        Cfg::parse(attr)
                             .map_err(|e| self.cx.sess().dcx().span_err(e.span, e.msg))
                             .ok()
                     })

tests/rustdoc-ui/cfg-boolean-literal.rs

@@ -0,0 +1,19 @@
+//@ check-pass
+
+#![feature(cfg_boolean_literals)]
+#![feature(doc_cfg)]
+
+#[doc(cfg(false))]
+pub fn foo() {}
+
+#[doc(cfg(true))]
+pub fn bar() {}
+
+#[doc(cfg(any(true)))]
+pub fn zoo() {}
+
+#[doc(cfg(all(true)))]
+pub fn toy() {}
+
+#[doc(cfg(not(true)))]
+pub fn nay() {}