fix-21295

crates/ruff_linter/resources/test/fixtures/flake8_logging_format/G004.py

@@ -64,3 +64,12 @@ import logging
 
 x = 1
 logging.error(f"{x} -> %s", x)
+
+# Test cases for control characters in f-strings
+bar = "bar"
+logging.getLogger().error(f"Lorem ipsum \n {bar}")
+
+value = "test"
+logging.info(f"Tab\t{value}")
+
+logging.info(f"CR\r{value}")

crates/ruff_linter/src/rules/flake8_logging_format/rules/logging_call.rs

@@ -14,6 +14,26 @@ use crate::rules::flake8_logging_format::violations::{
 };
 use crate::{Edit, Fix};
 
+/// Escape control characters and quotes for use in a Python string literal.
+/// Escapes newlines, tabs, carriage returns, backslashes, and quotes that match the quote style.
+fn escape_string_for_literal(text: &str, quote_char: char) -> String {
+    let mut escaped = String::with_capacity(text.len() * 2);
+    for ch in text.chars() {
+        match ch {
+            '\n' => escaped.push_str("\\n"),
+            '\t' => escaped.push_str("\\t"),
+            '\r' => escaped.push_str("\\r"),
+            '\\' => escaped.push_str("\\\\"),
+            ch if ch == quote_char => {
+                escaped.push('\\');
+                escaped.push(ch);
+            }
+            _ => escaped.push(ch),
+        }
+    }
+    escaped
+}
+
 fn logging_f_string(
     checker: &Checker,
     msg: &Expr,
@@ -50,6 +70,9 @@ fn logging_f_string(
         .next()
         .unwrap_or("\"");
 
+    // Extract the quote character for escaping
+    let quote_char = quote_str.chars().next().unwrap_or('"');
+
     for part in &f_string.value {
         match part {
             ast::FStringPart::Literal(literal) => {
@@ -57,7 +80,7 @@ fn logging_f_string(
                 if literal_text.contains('%') {
                     return;
                 }
-                format_string.push_str(literal_text);
+                format_string.push_str(&escape_string_for_literal(literal_text, quote_char));
             }
             ast::FStringPart::FString(f) => {
                 for element in &f.elements {
@@ -69,7 +92,10 @@ fn logging_f_string(
                             if lit.value.as_ref().contains('%') {
                                 return;
                             }
-                            format_string.push_str(lit.value.as_ref());
+                            format_string.push_str(&escape_string_for_literal(
+                                lit.value.as_ref(),
+                                quote_char,
+                            ));
                         }
                         InterpolatedStringElement::Interpolation(interpolated) => {
                             if interpolated.format_spec.is_some()

crates/ruff_linter/src/rules/flake8_logging_format/snapshots/ruff_linter__rules__flake8_logging_format__tests__G004.py.snap

@@ -217,5 +217,40 @@ G004 Logging statement uses f-string
 65 | x = 1
 66 | logging.error(f"{x} -> %s", x)
    |               ^^^^^^^^^^^^
+67 |
+68 | # Test cases for control characters in f-strings
+   |
+help: Convert to lazy `%` formatting
+
+G004 Logging statement uses f-string
+  --> G004.py:70:27
+   |
+68 | # Test cases for control characters in f-strings
+69 | bar = "bar"
+70 | logging.getLogger().error(f"Lorem ipsum \n {bar}")
+   |                           ^^^^^^^^^^^^^^^^^^^^^^^
+71 |
+72 | value = "test"
+   |
+help: Convert to lazy `%` formatting
+
+G004 Logging statement uses f-string
+  --> G004.py:73:14
+   |
+72 | value = "test"
+73 | logging.info(f"Tab\t{value}")
+   |              ^^^^^^^^^^^^^^^
+74 |
+75 | logging.info(f"CR\r{value}")
+   |
+help: Convert to lazy `%` formatting
+
+G004 Logging statement uses f-string
+  --> G004.py:75:14
+   |
+73 | logging.info(f"Tab\t{value}")
+74 |
+75 | logging.info(f"CR\r{value}")
+   |              ^^^^^^^^^^^^^^
    |
 help: Convert to lazy `%` formatting

crates/ruff_linter/src/rules/flake8_logging_format/snapshots/ruff_linter__rules__flake8_logging_format__tests__preview__G004_G004.py.snap

@@ -273,5 +273,60 @@ G004 Logging statement uses f-string
 65 | x = 1
 66 | logging.error(f"{x} -> %s", x)
    |               ^^^^^^^^^^^^
+67 |
+68 | # Test cases for control characters in f-strings
    |
 help: Convert to lazy `%` formatting
+
+G004 [*] Logging statement uses f-string
+  --> G004.py:70:27
+   |
+68 | # Test cases for control characters in f-strings
+69 | bar = "bar"
+70 | logging.getLogger().error(f"Lorem ipsum \n {bar}")
+   |                           ^^^^^^^^^^^^^^^^^^^^^^^
+71 |
+72 | value = "test"
+   |
+help: Convert to lazy `%` formatting
+67 | 
+68 | # Test cases for control characters in f-strings
+69 | bar = "bar"
+   - logging.getLogger().error(f"Lorem ipsum \n {bar}")
+70 + logging.getLogger().error("Lorem ipsum \n %s", bar)
+71 | 
+72 | value = "test"
+73 | logging.info(f"Tab\t{value}")
+
+G004 [*] Logging statement uses f-string
+  --> G004.py:73:14
+   |
+72 | value = "test"
+73 | logging.info(f"Tab\t{value}")
+   |              ^^^^^^^^^^^^^^^
+74 |
+75 | logging.info(f"CR\r{value}")
+   |
+help: Convert to lazy `%` formatting
+70 | logging.getLogger().error(f"Lorem ipsum \n {bar}")
+71 | 
+72 | value = "test"
+   - logging.info(f"Tab\t{value}")
+73 + logging.info("Tab\t%s", value)
+74 | 
+75 | logging.info(f"CR\r{value}")
+
+G004 [*] Logging statement uses f-string
+  --> G004.py:75:14
+   |
+73 | logging.info(f"Tab\t{value}")
+74 |
+75 | logging.info(f"CR\r{value}")
+   |              ^^^^^^^^^^^^^^
+   |
+help: Convert to lazy `%` formatting
+72 | value = "test"
+73 | logging.info(f"Tab\t{value}")
+74 | 
+   - logging.info(f"CR\r{value}")
+75 + logging.info("CR\r%s", value)