Merge #4876

4876: Syntactic highlighting of NAME_REF for injections r=matklad a=ltentrup

This commit adds a function that tries to determine the syntax highlighting class of NAME_REFs based on the usage.
It is used for highlighting injections (such as highlighting of doctests) as the semantic logic will most of the time result in unresolved references.
It also adds a color to unresolved references in HTML encoding.

Follow up of #4683.
Fixes #4809.

Co-authored-by: Leander Tentrup <[email protected]>

1 files changed, 12 insertions, 2 deletions

diff --git a/crates/ra_ide/src/syntax_highlighting/tests.rs b/crates/ra_ide/src/syntax_highlighting/tests.rs
index 070b24f45..062b3ff4a 100644
--- a/crates/ra_ide/src/syntax_highlighting/tests.rs
+++ b/crates/ra_ide/src/syntax_highlighting/tests.rs
@@ -287,7 +287,13 @@ fn main() {
 fn test_highlight_doctest() {
     check_highlighting(
         r#"
+struct Foo {
+    bar: bool,
+}
+
 impl Foo {
+    pub const bar: bool = true;
+
     /// Constructs a new `Foo`.
     ///
     /// # Examples
@@ -297,7 +303,7 @@ impl Foo {
     /// let mut foo: Foo = Foo::new();
     /// ```
     pub const fn new() -> Foo {
-        Foo { }
+        Foo { bar: true }
     }
 
     /// `bar` method on `Foo`.
@@ -305,11 +311,15 @@ impl Foo {
     /// # Examples
     ///
     /// ```
+    /// use x::y;
+    ///
     /// let foo = Foo::new();
     ///
     /// // calls bar on foo
     /// assert!(foo.bar());
     ///
+    /// let bar = foo.bar || Foo::bar;
+    ///
     /// /* multi-line
     ///        comment */
     ///
@@ -330,7 +340,7 @@ impl Foo {
         .trim(),
         "crates/ra_ide/src/snapshots/highlight_doctest.html",
         false,
-    )
+    );
 }
 
 /// Highlights the code given by the `ra_fixture` argument, renders the