Add the rust-analyzer.semanticHighlighting.comments.enable configuration value

crates/ide/src/lib.rs

@@ -703,6 +703,20 @@ impl Analysis {
         })
     }
 
+    /// Computes syntax highlighting for the given file.
+    pub fn highlight_as_html_with_config(
+        &self,
+        config: HighlightConfig,
+        file_id: FileId,
+        rainbow: bool,
+    ) -> Cancellable<String> {
+        // highlighting may construct a new database for "speculative" execution, so we can't currently attach the database
+        // highlighting instead sets up the attach hook where neceesary for the trait solver
+        Cancelled::catch(|| {
+            syntax_highlighting::highlight_as_html_with_config(&self.db, config, file_id, rainbow)
+        })
+    }
+
     /// Computes syntax highlighting for the given file.
     pub fn highlight_as_html(&self, file_id: FileId, rainbow: bool) -> Cancellable<String> {
         // highlighting may construct a new database for "speculative" execution, so we can't currently attach the database

crates/ide/src/syntax_highlighting.rs

@@ -35,6 +35,7 @@ use crate::{
 };
 
 pub(crate) use html::highlight_as_html;
+pub(crate) use html::highlight_as_html_with_config;
 
 #[derive(Debug, Clone, Copy)]
 pub struct HlRange {
@@ -47,6 +48,8 @@ pub struct HlRange {
 pub struct HighlightConfig {
     /// Whether to highlight strings
     pub strings: bool,
+    /// Whether to highlight comments
+    pub comments: bool,
     /// Whether to highlight punctuation
     pub punctuation: bool,
     /// Whether to specialize punctuation highlights
@@ -588,6 +591,7 @@ fn descend_token(
 fn filter_by_config(highlight: &mut Highlight, config: HighlightConfig) -> bool {
     match &mut highlight.tag {
         HlTag::StringLiteral if !config.strings => return false,
+        HlTag::Comment if !config.comments => return false,
         // If punctuation is disabled, make the macro bang part of the macro call again.
         tag @ HlTag::Punctuation(HlPunct::MacroBang) => {
             if !config.macro_bang {

crates/ide/src/syntax_highlighting/html.rs

@@ -10,7 +10,12 @@ use crate::{
     syntax_highlighting::{HighlightConfig, highlight},
 };
 
-pub(crate) fn highlight_as_html(db: &RootDatabase, file_id: FileId, rainbow: bool) -> String {
+pub(crate) fn highlight_as_html_with_config(
+    db: &RootDatabase,
+    config: HighlightConfig,
+    file_id: FileId,
+    rainbow: bool,
+) -> String {
     let sema = Semantics::new(db);
     let file_id = sema
         .attach_first_edition(file_id)
@@ -27,21 +32,7 @@ pub(crate) fn highlight_as_html(db: &RootDatabase, file_id: FileId, rainbow: boo
         )
     }
 
-    let hl_ranges = highlight(
+    let hl_ranges = highlight(db, config, file_id.file_id(db), None);
-        db,
-        HighlightConfig {
-            strings: true,
-            punctuation: true,
-            specialize_punctuation: true,
-            specialize_operator: true,
-            operator: true,
-            inject_doc_comment: true,
-            macro_bang: true,
-            syntactic_name_ref_highlighting: false,
-        },
-        file_id.file_id(db),
-        None,
-    );
     let text = file.to_string();
     let mut buf = String::new();
     buf.push_str(STYLE);
@@ -66,6 +57,25 @@ pub(crate) fn highlight_as_html(db: &RootDatabase, file_id: FileId, rainbow: boo
     buf
 }
 
+pub(crate) fn highlight_as_html(db: &RootDatabase, file_id: FileId, rainbow: bool) -> String {
+    highlight_as_html_with_config(
+        db,
+        HighlightConfig {
+            strings: true,
+            comments: true,
+            punctuation: true,
+            specialize_punctuation: true,
+            specialize_operator: true,
+            operator: true,
+            inject_doc_comment: true,
+            macro_bang: true,
+            syntactic_name_ref_highlighting: false,
+        },
+        file_id,
+        rainbow,
+    )
+}
+
 //FIXME: like, real html escaping
 fn html_escape(text: &str) -> String {
     text.replace('<', "&lt;").replace('>', "&gt;")

crates/ide/src/syntax_highlighting/inject.rs

@@ -80,6 +80,7 @@ pub(super) fn ra_fixture(
         .highlight(
             HighlightConfig {
                 syntactic_name_ref_highlighting: false,
+                comments: true,
                 punctuation: true,
                 operator: true,
                 strings: true,
@@ -250,6 +251,7 @@ pub(super) fn doc_comment(
             db,
             HighlightConfig {
                 syntactic_name_ref_highlighting: true,
+                comments: true,
                 punctuation: true,
                 operator: true,
                 strings: true,

crates/ide/src/syntax_highlighting/test_data/highlight_comments_disabled.html

@@ -0,0 +1,48 @@
+
+<style>
+body                { margin: 0; }
+pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padding: 0.4em; }
+
+.lifetime           { color: #DFAF8F; font-style: italic; }
+.label              { color: #DFAF8F; font-style: italic; }
+.comment            { color: #7F9F7F; }
+.documentation      { color: #629755; }
+.intra_doc_link     { font-style: italic; }
+.injected           { opacity: 0.65 ; }
+.struct, .enum      { color: #7CB8BB; }
+.enum_variant       { color: #BDE0F3; }
+.string_literal     { color: #CC9393; }
+.field              { color: #94BFF3; }
+.function           { color: #93E0E3; }
+.parameter          { color: #94BFF3; }
+.text               { color: #DCDCCC; }
+.type               { color: #7CB8BB; }
+.builtin_type       { color: #8CD0D3; }
+.type_param         { color: #DFAF8F; }
+.attribute          { color: #94BFF3; }
+.numeric_literal    { color: #BFEBBF; }
+.bool_literal       { color: #BFE6EB; }
+.macro              { color: #94BFF3; }
+.proc_macro         { color: #94BFF3; text-decoration: underline; }
+.derive             { color: #94BFF3; font-style: italic; }
+.module             { color: #AFD8AF; }
+.value_param        { color: #DCDCCC; }
+.variable           { color: #DCDCCC; }
+.format_specifier   { color: #CC696B; }
+.mutable            { text-decoration: underline; }
+.escape_sequence    { color: #94BFF3; }
+.keyword            { color: #F0DFAF; font-weight: bold; }
+.control            { font-style: italic; }
+.reference          { font-style: italic; font-weight: bold; }
+.const              { font-weight: bolder; }
+.unsafe             { color: #BC8383; }
+
+.invalid_escape_sequence { color: #FC5555; text-decoration: wavy underline; }
+.unresolved_reference    { color: #FC5555; text-decoration: wavy underline; }
+</style>
+<pre><code>// This is a regular comment
+/// This is a doc comment
+<span class="keyword">fn</span> <span class="function declaration">main</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
+    // Another comment
+    <span class="unresolved_reference">println</span><span class="macro_bang">!</span><span class="parenthesis">(</span><span class="string_literal">"Hello, world!"</span><span class="parenthesis">)</span><span class="semicolon">;</span>
+<span class="brace">}</span></code></pre>

crates/ide/src/syntax_highlighting/tests.rs

@@ -9,6 +9,7 @@ use crate::{FileRange, HighlightConfig, HlTag, TextRange, fixture};
 
 const HL_CONFIG: HighlightConfig = HighlightConfig {
     strings: true,
+    comments: true,
     punctuation: true,
     specialize_punctuation: true,
     specialize_operator: true,
@@ -1220,14 +1221,23 @@ fn foo(x: &fn(&dyn Trait)) {}
 /// Highlights the code given by the `ra_fixture` argument, renders the
 /// result as HTML, and compares it with the HTML file given as `snapshot`.
 /// Note that the `snapshot` file is overwritten by the rendered HTML.
+fn check_highlighting_with_config(
+    #[rust_analyzer::rust_fixture] ra_fixture: &str,
+    config: HighlightConfig,
+    expect: ExpectFile,
+    rainbow: bool,
+) {
+    let (analysis, file_id) = fixture::file(ra_fixture.trim());
+    let actual_html = &analysis.highlight_as_html_with_config(config, file_id, rainbow).unwrap();
+    expect.assert_eq(actual_html)
+}
+
 fn check_highlighting(
     #[rust_analyzer::rust_fixture] ra_fixture: &str,
     expect: ExpectFile,
     rainbow: bool,
 ) {
-    let (analysis, file_id) = fixture::file(ra_fixture.trim());
+    check_highlighting_with_config(ra_fixture, HL_CONFIG, expect, rainbow)
-    let actual_html = &analysis.highlight_as_html(file_id, rainbow).unwrap();
-    expect.assert_eq(actual_html)
 }
 
 #[test]
@@ -1435,3 +1445,24 @@ fn main() {
         false,
     );
 }
+
+#[test]
+fn test_comment_highlighting_disabled() {
+    // Test that comments are not highlighted when disabled
+    check_highlighting_with_config(
+        r#"
+// This is a regular comment
+/// This is a doc comment
+fn main() {
+    // Another comment
+    println!("Hello, world!");
+}
+"#,
+        HighlightConfig {
+            comments: false, // Disable comment highlighting
+            ..HL_CONFIG
+        },
+        expect_file!["./test_data/highlight_comments_disabled.html"],
+        false,
+    );
+}

crates/rust-analyzer/src/config.rs

@@ -382,6 +382,13 @@ config_data! {
         /// Exclude tests from find-all-references and call-hierarchy.
         references_excludeTests: bool = false,
 
+        /// Use semantic tokens for comments.
+        ///
+        /// In some editors (e.g. vscode) semantic tokens override other highlighting grammars.
+        /// By disabling semantic tokens for comments, other grammars can be used to highlight
+        /// their contents.
+        semanticHighlighting_comments_enable: bool = true,
+
         /// Inject additional highlighting into doc comments.
         ///
         /// When enabled, rust-analyzer will highlight rust source in doc comments as well as intra
@@ -1968,6 +1975,7 @@ impl Config {
     pub fn highlighting_config(&self) -> HighlightConfig {
         HighlightConfig {
             strings: self.semanticHighlighting_strings_enable().to_owned(),
+            comments: self.semanticHighlighting_comments_enable().to_owned(),
             punctuation: self.semanticHighlighting_punctuation_enable().to_owned(),
             specialize_punctuation: self
                 .semanticHighlighting_punctuation_specialization_enable()

docs/book/src/configuration_generated.md

@@ -1378,6 +1378,17 @@ Enables the use of rustfmt's unstable range formatting command for the
 available on a nightly build.
 
 
+## rust-analyzer.semanticHighlighting.comments.enable {#semanticHighlighting.comments.enable}
+
+Default: `true`
+
+Use semantic tokens for comments.
+
+In some editors (e.g. vscode) semantic tokens override other highlighting grammars.
+By disabling semantic tokens for comments, other grammars can be used to highlight
+their contents.
+
+
 ## rust-analyzer.semanticHighlighting.doc.comment.inject.enable {#semanticHighlighting.doc.comment.inject.enable}
 
 Default: `true`

editors/code/package.json

@@ -2850,6 +2850,16 @@
                     }
                 }
             },
+            {
+                "title": "Semantic Highlighting",
+                "properties": {
+                    "rust-analyzer.semanticHighlighting.comments.enable": {
+                        "markdownDescription": "Use semantic tokens for comments.\n\nIn some editors (e.g. vscode) semantic tokens override other highlighting grammars.\nBy disabling semantic tokens for comments, other grammars can be used to highlight\ntheir contents.",
+                        "default": true,
+                        "type": "boolean"
+                    }
+                }
+            },
             {
                 "title": "Semantic Highlighting",
                 "properties": {