1 files changed, 21 insertions, 17 deletions
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/utils.rs b/src/tools/rust-analyzer/crates/ide-assists/src/utils.rs
index 7add66064..f323ebcf7 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/utils.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/utils.rs
@@ -208,23 +208,6 @@ pub(crate) fn render_snippet(_cap: SnippetCap, node: &SyntaxNode, cursor: Cursor
     }
 }
 
-/// Escapes text that should be rendered as-is, typically those that we're copy-pasting what the
-/// users wrote.
-///
-/// This function should only be used when the text doesn't contain snippet **AND** the text
-/// wouldn't be included in a snippet.
-pub(crate) fn escape_non_snippet(text: &mut String) {
-    // While we *can* escape `}`, we don't really have to in this specific case. We only need to
-    // escape it inside `${}` to disambiguate it from the ending token of the syntax, but after we
-    // escape every occurrence of `$`, we wouldn't have `${}` in the first place.
-    //
-    // This will break if the text contains snippet or it will be included in a snippet (hence doc
-    // comment). Compare `fn escape(buf)` in `render_snippet()` above, where the escaped text is
-    // included in a snippet.
-    stdx::replace(text, '\\', r"\\");
-    stdx::replace(text, '$', r"\$");
-}
-
 pub(crate) fn vis_offset(node: &SyntaxNode) -> TextSize {
     node.children_with_tokens()
         .find(|it| !matches!(it.kind(), WHITESPACE | COMMENT | ATTR))
@@ -758,3 +741,24 @@ pub(crate) fn convert_param_list_to_arg_list(list: ast::ParamList) -> ast::ArgLi
     }
     make::arg_list(args)
 }
+
+/// Calculate the number of hashes required for a raw string containing `s`
+pub(crate) fn required_hashes(s: &str) -> usize {
+    let mut res = 0usize;
+    for idx in s.match_indices('"').map(|(i, _)| i) {
+        let (_, sub) = s.split_at(idx + 1);
+        let n_hashes = sub.chars().take_while(|c| *c == '#').count();
+        res = res.max(n_hashes + 1)
+    }
+    res
+}
+#[test]
+fn test_required_hashes() {
+    assert_eq!(0, required_hashes("abc"));
+    assert_eq!(0, required_hashes("###"));
+    assert_eq!(1, required_hashes("\""));
+    assert_eq!(2, required_hashes("\"#abc"));
+    assert_eq!(0, required_hashes("#abc"));
+    assert_eq!(3, required_hashes("#ab\"##c"));
+    assert_eq!(5, required_hashes("#ab\"##\"####c"));
+}