3 files changed, 22 insertions, 20 deletions

diff --git a/crates/ra_cfg/Cargo.toml b/crates/ra_cfg/Cargo.toml
index 9165076a5..6425cd6d6 100644
--- a/crates/ra_cfg/Cargo.toml
+++ b/crates/ra_cfg/Cargo.toml
@@ -3,6 +3,7 @@ edition = "2018"
 name = "ra_cfg"
 version = "0.1.0"
 authors = ["rust-analyzer developers"]
+license = "MIT OR Apache-2.0"
 
 [lib]
 doctest = false
diff --git a/crates/ra_cfg/src/cfg_expr.rs b/crates/ra_cfg/src/cfg_expr.rs
index 85b100c6a..f48928aee 100644
--- a/crates/ra_cfg/src/cfg_expr.rs
+++ b/crates/ra_cfg/src/cfg_expr.rs
@@ -5,7 +5,6 @@
 use std::slice::Iter as SliceIter;
 
 use ra_syntax::SmolStr;
-use tt::{Leaf, Subtree, TokenTree};
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum CfgExpr {
@@ -18,6 +17,9 @@ pub enum CfgExpr {
 }
 
 impl CfgExpr {
+    pub fn parse(tt: &tt::Subtree) -> CfgExpr {
+        next_cfg_expr(&mut tt.token_trees.iter()).unwrap_or(CfgExpr::Invalid)
+    }
     /// Fold the cfg by querying all basic `Atom` and `KeyValue` predicates.
     pub fn fold(&self, query: &dyn Fn(&SmolStr, Option<&SmolStr>) -> bool) -> Option<bool> {
         match self {
@@ -35,22 +37,18 @@ impl CfgExpr {
     }
 }
 
-pub fn parse_cfg(tt: &Subtree) -> CfgExpr {
-    next_cfg_expr(&mut tt.token_trees.iter()).unwrap_or(CfgExpr::Invalid)
-}
-
 fn next_cfg_expr(it: &mut SliceIter<tt::TokenTree>) -> Option<CfgExpr> {
     let name = match it.next() {
         None => return None,
-        Some(TokenTree::Leaf(Leaf::Ident(ident))) => ident.text.clone(),
+        Some(tt::TokenTree::Leaf(tt::Leaf::Ident(ident))) => ident.text.clone(),
         Some(_) => return Some(CfgExpr::Invalid),
     };
 
     // Peek
     let ret = match it.as_slice().first() {
-        Some(TokenTree::Leaf(Leaf::Punct(punct))) if punct.char == '=' => {
+        Some(tt::TokenTree::Leaf(tt::Leaf::Punct(punct))) if punct.char == '=' => {
             match it.as_slice().get(1) {
-                Some(TokenTree::Leaf(Leaf::Literal(literal))) => {
+                Some(tt::TokenTree::Leaf(tt::Leaf::Literal(literal))) => {
                     it.next();
                     it.next();
                     // FIXME: escape? raw string?
@@ -61,7 +59,7 @@ fn next_cfg_expr(it: &mut SliceIter<tt::TokenTree>) -> Option<CfgExpr> {
                 _ => return Some(CfgExpr::Invalid),
             }
         }
-        Some(TokenTree::Subtree(subtree)) => {
+        Some(tt::TokenTree::Subtree(subtree)) => {
             it.next();
             let mut sub_it = subtree.token_trees.iter();
             let mut subs = std::iter::from_fn(|| next_cfg_expr(&mut sub_it)).collect();
@@ -76,7 +74,7 @@ fn next_cfg_expr(it: &mut SliceIter<tt::TokenTree>) -> Option<CfgExpr> {
     };
 
     // Eat comma separator
-    if let Some(TokenTree::Leaf(Leaf::Punct(punct))) = it.as_slice().first() {
+    if let Some(tt::TokenTree::Leaf(tt::Leaf::Punct(punct))) = it.as_slice().first() {
         if punct.char == ',' {
             it.next();
         }
@@ -99,7 +97,8 @@ mod tests {
 
     fn assert_parse_result(input: &str, expected: CfgExpr) {
         let (tt, _) = get_token_tree_generated(input);
-        assert_eq!(parse_cfg(&tt), expected);
+        let cfg = CfgExpr::parse(&tt);
+        assert_eq!(cfg, expected);
     }
 
     #[test]
diff --git a/crates/ra_cfg/src/lib.rs b/crates/ra_cfg/src/lib.rs
index 57feabcb2..cd5a0a7b6 100644
--- a/crates/ra_cfg/src/lib.rs
+++ b/crates/ra_cfg/src/lib.rs
@@ -5,7 +5,7 @@ mod cfg_expr;
 use ra_syntax::SmolStr;
 use rustc_hash::FxHashSet;
 
-pub use cfg_expr::{parse_cfg, CfgExpr};
+pub use cfg_expr::CfgExpr;
 
 /// Configuration options used for conditional compilition on items with `cfg` attributes.
 /// We have two kind of options in different namespaces: atomic options like `unix`, and
@@ -31,19 +31,21 @@ impl CfgOptions {
         })
     }
 
-    pub fn is_cfg_enabled(&self, attr: &tt::Subtree) -> Option<bool> {
-        self.check(&parse_cfg(attr))
-    }
-
     pub fn insert_atom(&mut self, key: SmolStr) {
         self.atoms.insert(key);
     }
 
-    pub fn remove_atom(&mut self, name: &str) {
-        self.atoms.remove(name);
-    }
-
     pub fn insert_key_value(&mut self, key: SmolStr, value: SmolStr) {
         self.key_values.insert((key, value));
     }
+
+    pub fn append(&mut self, other: &CfgOptions) {
+        for atom in &other.atoms {
+            self.atoms.insert(atom.clone());
+        }
+
+        for (key, value) in &other.key_values {
+            self.key_values.insert((key.clone(), value.clone()));
+        }
+    }
 }