Correct quick fix message for W605

crates/ruff_linter/src/rules/pycodestyle/rules/invalid_escape_sequence.rs

@@ -5,7 +5,7 @@ use ruff_macros::{derive_message_formats, violation};
 use ruff_python_index::Indexer;
 use ruff_python_parser::Tok;
 use ruff_source_file::Locator;
-use ruff_text_size::{Ranged, TextLen, TextRange, TextSize};
+use ruff_text_size::{TextLen, TextRange, TextSize};
 
 use crate::fix::edits::pad_start;
 
@@ -25,23 +25,51 @@ use crate::fix::edits::pad_start;
 /// regex = r"\.png$"
 /// ```
 ///
+/// Or, if the string already contains a valid escape sequence:
+/// ```python
+/// value = "new line\nand invalid escape \_ here"
+/// ```
+///
+/// Use instead:
+/// ```python
+/// value = "new line\nand invalid escape \\_ here"
+/// ```
+///
 /// ## References
 /// - [Python documentation: String and Bytes literals](https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals)
 #[violation]
-pub struct InvalidEscapeSequence(char);
+pub struct InvalidEscapeSequence {
+    ch: char,
+    fix_title: FixTitle,
+}
 
 impl AlwaysFixableViolation for InvalidEscapeSequence {
     #[derive_message_formats]
     fn message(&self) -> String {
-        let InvalidEscapeSequence(char) = self;
-        format!("Invalid escape sequence: `\\{char}`")
+        let InvalidEscapeSequence { ch, .. } = self;
+        format!("Invalid escape sequence: `\\{ch}`")
     }
 
     fn fix_title(&self) -> String {
-        "Add backslash to escape sequence".to_string()
+        match self.fix_title {
+            FixTitle::AddBackslash => format!("Add backslash to escape sequence"),
+            FixTitle::UseRawStringLiteral => format!("Use a raw string literal"),
+        }
     }
 }
 
+#[derive(Debug, PartialEq, Eq)]
+enum FixTitle {
+    AddBackslash,
+    UseRawStringLiteral,
+}
+
+#[derive(Debug)]
+struct InvalidEscapeChar {
+    ch: char,
+    range: TextRange,
+}
+
 /// W605
 pub(crate) fn invalid_escape_sequence(
     diagnostics: &mut Vec<Diagnostic>,
@@ -67,7 +95,7 @@ pub(crate) fn invalid_escape_sequence(
     };
 
     let mut contains_valid_escape_sequence = false;
-    let mut invalid_escape_sequence = Vec::new();
+    let mut invalid_escape_chars = Vec::new();
 
     let mut prev = None;
     let bytes = token_source_code.as_bytes();
@@ -154,16 +182,28 @@ pub(crate) fn invalid_escape_sequence(
 
         let location = token_range.start() + TextSize::try_from(i).unwrap();
         let range = TextRange::at(location, next_char.text_len() + TextSize::from(1));
-        invalid_escape_sequence.push(Diagnostic::new(InvalidEscapeSequence(next_char), range));
+        invalid_escape_chars.push(InvalidEscapeChar {
+            ch: next_char,
+            range,
+        });
     }
 
+    let mut invalid_escape_sequence = Vec::new();
     if contains_valid_escape_sequence {
         // Escape with backslash.
-        for diagnostic in &mut invalid_escape_sequence {
-            diagnostic.set_fix(Fix::safe_edit(Edit::insertion(
+        for invalid_escape_char in &invalid_escape_chars {
+            let diagnostic = Diagnostic::new(
+                InvalidEscapeSequence {
+                    ch: invalid_escape_char.ch,
+                    fix_title: FixTitle::AddBackslash,
+                },
+                invalid_escape_char.range,
+            )
+            .with_fix(Fix::safe_edit(Edit::insertion(
                 r"\".to_string(),
-                diagnostic.start() + TextSize::from(1),
+                invalid_escape_char.range.start() + TextSize::from(1),
             )));
+            invalid_escape_sequence.push(diagnostic);
         }
     } else {
         let tok_start = if token.is_f_string_middle() {
@@ -178,14 +218,24 @@ pub(crate) fn invalid_escape_sequence(
             token_range.start()
         };
         // Turn into raw string.
-        for diagnostic in &mut invalid_escape_sequence {
-            // If necessary, add a space between any leading keyword (`return`, `yield`,
-            // `assert`, etc.) and the string. For example, `return"foo"` is valid, but
-            // `returnr"foo"` is not.
-            diagnostic.set_fix(Fix::safe_edit(Edit::insertion(
-                pad_start("r".to_string(), tok_start, locator),
-                tok_start,
-            )));
+        for invalid_escape_char in &invalid_escape_chars {
+            let diagnostic = Diagnostic::new(
+                InvalidEscapeSequence {
+                    ch: invalid_escape_char.ch,
+                    fix_title: FixTitle::UseRawStringLiteral,
+                },
+                invalid_escape_char.range,
+            )
+            .with_fix(
+                // If necessary, add a space between any leading keyword (`return`, `yield`,
+                // `assert`, etc.) and the string. For example, `return"foo"` is valid, but
+                // `returnr"foo"` is not.
+                Fix::safe_edit(Edit::insertion(
+                    pad_start("r".to_string(), tok_start, locator),
+                    tok_start,
+                )),
+            );
+            invalid_escape_sequence.push(diagnostic);
         }
     }
 

crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__W605_W605_0.py.snap

@@ -9,7 +9,7 @@ W605_0.py:2:10: W605 [*] Invalid escape sequence: `\.`
 3 | 
 4 | #: W605:2:1
   |
-  = help: Add backslash to escape sequence
+  = help: Use a raw string literal
 
 ℹ Fix
 1 1 | #: W605:1:10
@@ -27,7 +27,7 @@ W605_0.py:6:1: W605 [*] Invalid escape sequence: `\.`
   | ^^ W605
 7 | '''
   |
-  = help: Add backslash to escape sequence
+  = help: Use a raw string literal
 
 ℹ Fix
 2 2 | regex = '\.png$'
@@ -47,7 +47,7 @@ W605_0.py:11:6: W605 [*] Invalid escape sequence: `\_`
    |      ^^ W605
 12 | )
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 8  8  | 
@@ -68,7 +68,7 @@ W605_0.py:18:6: W605 [*] Invalid escape sequence: `\_`
 19 | in the middle
 20 | """
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 12 12 | )
@@ -107,7 +107,7 @@ W605_0.py:28:12: W605 [*] Invalid escape sequence: `\.`
 29 | 
 30 | #: Okay
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 25 25 | 

crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__W605_W605_1.py.snap

@@ -9,7 +9,7 @@ W605_1.py:2:10: W605 [*] Invalid escape sequence: `\.`
 3 | 
 4 | #: W605:2:1
   |
-  = help: Add backslash to escape sequence
+  = help: Use a raw string literal
 
 ℹ Fix
 1 1 | #: W605:1:10
@@ -27,7 +27,7 @@ W605_1.py:6:1: W605 [*] Invalid escape sequence: `\.`
   | ^^ W605
 7 | '''
   |
-  = help: Add backslash to escape sequence
+  = help: Use a raw string literal
 
 ℹ Fix
 2 2 | regex = '\.png$'
@@ -47,7 +47,7 @@ W605_1.py:11:6: W605 [*] Invalid escape sequence: `\_`
    |      ^^ W605
 12 | )
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 8  8  | 
@@ -68,7 +68,7 @@ W605_1.py:18:6: W605 [*] Invalid escape sequence: `\_`
 19 | in the middle
 20 | """
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 12 12 | )
@@ -89,7 +89,7 @@ W605_1.py:25:12: W605 [*] Invalid escape sequence: `\.`
 26 | 
 27 | #: Okay
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 22 22 | 

crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__W605_W605_2.py.snap

@@ -1,5 +1,5 @@
 ---
-source: crates/ruff/src/rules/pycodestyle/mod.rs
+source: crates/ruff_linter/src/rules/pycodestyle/mod.rs
 ---
 W605_2.py:4:11: W605 [*] Invalid escape sequence: `\.`
   |
@@ -9,7 +9,7 @@ W605_2.py:4:11: W605 [*] Invalid escape sequence: `\.`
 5 | 
 6 | #: W605:2:1
   |
-  = help: Add backslash to escape sequence
+  = help: Use a raw string literal
 
 ℹ Fix
 1 1 | # Same as `W605_0.py` but using f-strings instead.
@@ -29,7 +29,7 @@ W605_2.py:8:1: W605 [*] Invalid escape sequence: `\.`
   | ^^ W605
 9 | '''
   |
-  = help: Add backslash to escape sequence
+  = help: Use a raw string literal
 
 ℹ Fix
 4 4 | regex = f'\.png$'
@@ -49,7 +49,7 @@ W605_2.py:13:7: W605 [*] Invalid escape sequence: `\_`
    |       ^^ W605
 14 | )
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 10 10 | 
@@ -70,7 +70,7 @@ W605_2.py:20:6: W605 [*] Invalid escape sequence: `\_`
 21 | in the middle
 22 | """
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 14 14 | )
@@ -129,7 +129,7 @@ W605_2.py:44:11: W605 [*] Invalid escape sequence: `\{`
 45 | value = f'\{1}'
 46 | value = f'{1:\}'
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 41 41 | '''  # noqa
@@ -150,7 +150,7 @@ W605_2.py:45:11: W605 [*] Invalid escape sequence: `\{`
 46 | value = f'{1:\}'
 47 | value = f"{f"\{1}"}"
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 42 42 | 
@@ -171,7 +171,7 @@ W605_2.py:46:14: W605 [*] Invalid escape sequence: `\}`
 47 | value = f"{f"\{1}"}"
 48 | value = rf"{f"\{1}"}"
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 43 43 | regex = f'\\\_'
@@ -191,7 +191,7 @@ W605_2.py:47:14: W605 [*] Invalid escape sequence: `\{`
    |              ^^ W605
 48 | value = rf"{f"\{1}"}"
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 44 44 | value = f'\{{1}}'
@@ -212,7 +212,7 @@ W605_2.py:48:15: W605 [*] Invalid escape sequence: `\{`
 49 | 
 50 | # Okay
    |
-   = help: Add backslash to escape sequence
+   = help: Use a raw string literal
 
 ℹ Fix
 45 45 | value = f'\{1}'