rust-lang · ChayimFriedman2 · Jan 9, 2026 · Jan 8, 2026
diff --git a/crates/ide/src/syntax_highlighting.rs b/crates/ide/src/syntax_highlighting.rs
@@ -513,21 +513,21 @@ fn string_injections(
             );
 
             if !string.is_raw() {
-                highlight_escape_string(hl, &string);
+                highlight_escape_string(hl, config, &string);
             }
         }
     } else if let Some(byte_string) = ast::ByteString::cast(token.clone()) {
         if !byte_string.is_raw() {
-            highlight_escape_string(hl, &byte_string);
+            highlight_escape_string(hl, config, &byte_string);
         }
     } else if let Some(c_string) = ast::CString::cast(token.clone()) {
         if !c_string.is_raw() {
-            highlight_escape_string(hl, &c_string);
+            highlight_escape_string(hl, config, &c_string);
         }
     } else if let Some(char) = ast::Char::cast(token.clone()) {
-        highlight_escape_char(hl, &char)
+        highlight_escape_char(hl, config, &char)
     } else if let Some(byte) = ast::Byte::cast(token) {
-        highlight_escape_byte(hl, &byte)
+        highlight_escape_byte(hl, config, &byte)
     }
     ControlFlow::Continue(())
 }
@@ -586,7 +586,11 @@ 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::StringLiteral | HlTag::EscapeSequence | HlTag::InvalidEscapeSequence
+            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) => {

diff --git a/crates/ide/src/syntax_highlighting/escape.rs b/crates/ide/src/syntax_highlighting/escape.rs
@@ -1,10 +1,14 @@
 //! Syntax highlighting for escape sequences
 use crate::syntax_highlighting::highlights::Highlights;
-use crate::{HlRange, HlTag};
+use crate::{HighlightConfig, HlRange, HlTag};
 use syntax::ast::{Byte, Char, IsString};
 use syntax::{AstToken, TextRange, TextSize};
 
-pub(super) fn highlight_escape_string<T: IsString>(stack: &mut Highlights, string: &T) {
+pub(super) fn highlight_escape_string<T: IsString>(
+    stack: &mut Highlights,
+    config: &HighlightConfig<'_>,
+    string: &T,
+) {
     let text = string.text();
     let start = string.syntax().text_range().start();
     string.escaped_char_ranges(&mut |piece_range, char| {
@@ -13,16 +17,23 @@ pub(super) fn highlight_escape_string<T: IsString>(stack: &mut Highlights, strin
                 Ok(_) => HlTag::EscapeSequence,
                 Err(_) => HlTag::InvalidEscapeSequence,
             };
-            stack.add(HlRange {
-                range: piece_range + start,
-                highlight: highlight.into(),
-                binding_hash: None,
-            });
+            stack.add_with(
+                config,
+                HlRange {
+                    range: piece_range + start,
+                    highlight: highlight.into(),
+                    binding_hash: None,
+                },
+            );
         }
     });
 }
 
-pub(super) fn highlight_escape_char(stack: &mut Highlights, char: &Char) {
+pub(super) fn highlight_escape_char(
+    stack: &mut Highlights,
+    config: &HighlightConfig<'_>,
+    char: &Char,
+) {
     if char.value().is_err() {
         // We do not emit invalid escapes highlighting here. The lexer would likely be in a bad
         // state and this token contains junk, since `'` is not a reliable delimiter (consider
@@ -43,10 +54,17 @@ pub(super) fn highlight_escape_char(stack: &mut Highlights, char: &Char) {
         char.syntax().text_range().start() + TextSize::from(1),
         TextSize::from(text.len() as u32),
     );
-    stack.add(HlRange { range, highlight: HlTag::EscapeSequence.into(), binding_hash: None })
+    stack.add_with(
+        config,
+        HlRange { range, highlight: HlTag::EscapeSequence.into(), binding_hash: None },
+    )
 }
 
-pub(super) fn highlight_escape_byte(stack: &mut Highlights, byte: &Byte) {
+pub(super) fn highlight_escape_byte(
+    stack: &mut Highlights,
+    config: &HighlightConfig<'_>,
+    byte: &Byte,
+) {
     if byte.value().is_err() {
         // See `highlight_escape_char` for why no error highlighting here.
         return;
@@ -65,5 +83,8 @@ pub(super) fn highlight_escape_byte(stack: &mut Highlights, byte: &Byte) {
         byte.syntax().text_range().start() + TextSize::from(2),
         TextSize::from(text.len() as u32),
     );
-    stack.add(HlRange { range, highlight: HlTag::EscapeSequence.into(), binding_hash: None })
+    stack.add_with(
+        config,
+        HlRange { range, highlight: HlTag::EscapeSequence.into(), binding_hash: None },
+    )
 }
diff --git a/crates/ide/src/syntax_highlighting/highlights.rs b/crates/ide/src/syntax_highlighting/highlights.rs
@@ -4,7 +4,7 @@ use std::iter;
 use stdx::equal_range_by;
 use syntax::TextRange;
 
-use crate::{HlRange, HlTag};
+use crate::{HighlightConfig, HlRange, HlTag};
 
 pub(super) struct Highlights {
     root: Node,
@@ -26,6 +26,12 @@ impl Highlights {
         self.root.add(hl_range);
     }
 
+    pub(super) fn add_with(&mut self, config: &HighlightConfig<'_>, mut hl_range: HlRange) {
+        if super::filter_by_config(&mut hl_range.highlight, config) {
+            self.root.add(hl_range);
+        }
+    }
+
     pub(super) fn to_vec(&self) -> Vec<HlRange> {
         let mut res = Vec::new();
         self.root.flatten(&mut res);

diff --git a/crates/ide/src/syntax_highlighting/test_data/highlight_strings_disabled.html b/crates/ide/src/syntax_highlighting/test_data/highlight_strings_disabled.html
@@ -0,0 +1,47 @@
+
+<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; }
+.deprecated         { text-decoration: line-through; }
+
+.invalid_escape_sequence { color: #FC5555; text-decoration: wavy underline; }
+.unresolved_reference    { color: #FC5555; text-decoration: wavy underline; }
+</style>
+<pre><code><span class="keyword">fn</span> <span class="function declaration">main</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
+    <span class="macro default_library library">format_args</span><span class="macro_bang">!</span><span class="parenthesis">(</span>"foo\nbar"<span class="parenthesis">)</span><span class="semicolon">;</span>
+    <span class="macro default_library library">format_args</span><span class="macro_bang">!</span><span class="parenthesis">(</span>"foo\invalid"<span class="parenthesis">)</span><span class="semicolon">;</span>
+<span class="brace">}</span></code></pre>
diff --git a/crates/ide/src/syntax_highlighting/tests.rs b/crates/ide/src/syntax_highlighting/tests.rs
@@ -1498,6 +1498,23 @@ fn main() {
     );
 }
 
+#[test]
+fn test_strings_highlighting_disabled() {
+    // Test that comments are not highlighted when disabled
+    check_highlighting_with_config(
+        r#"
+//- minicore: fmt
+fn main() {
+    format_args!("foo\nbar");
+    format_args!("foo\invalid");
+}
+"#,
+        HighlightConfig { strings: false, ..HL_CONFIG },
+        expect_file!["./test_data/highlight_strings_disabled.html"],
+        false,
+    );
+}
+
 #[test]
 fn regression_20952() {
     check_highlighting(