feat(linter): implement noOctalEscape

crates/biome_diagnostics_categories/src/categories.rs

@@ -150,9 +150,10 @@ define_categories! {
     "lint/nursery/noInvalidPositionAtImportRule": "https://biomejs.dev/linter/rules/no-invalid-position-at-import-rule",
     "lint/nursery/noIrregularWhitespace": "https://biomejs.dev/linter/rules/no-irregular-whitespace",
     "lint/nursery/noMissingGenericFamilyKeyword": "https://biomejs.dev/linter/rules/no-missing-generic-family-keyword",
+    "lint/nursery/noMissingVarFunction": "https://biomejs.dev/linter/rules/no-missing-var-function",
+    "lint/nursery/noOctalEscape": "https://biomejs.dev/linter/rules/no-octal-escape",
     "lint/nursery/noProcessEnv": "https://biomejs.dev/linter/rules/no-process-env",
     "lint/nursery/noReactSpecificProps": "https://biomejs.dev/linter/rules/no-react-specific-props",
-    "lint/nursery/noMissingVarFunction": "https://biomejs.dev/linter/rules/no-missing-var-function",
     "lint/nursery/noRestrictedImports": "https://biomejs.dev/linter/rules/no-restricted-imports",
     "lint/nursery/noRestrictedTypes": "https://biomejs.dev/linter/rules/no-restricted-types",
     "lint/nursery/noSecrets": "https://biomejs.dev/linter/rules/no-secrets",

crates/biome_js_analyze/src/lint/nursery.rs

@@ -8,6 +8,7 @@ pub mod no_dynamic_namespace_import_access;
 pub mod no_enum;
 pub mod no_exported_imports;
 pub mod no_irregular_whitespace;
+pub mod no_octal_escape;
 pub mod no_process_env;
 pub mod no_restricted_imports;
 pub mod no_restricted_types;
@@ -36,6 +37,7 @@ declare_lint_group! {
             self :: no_enum :: NoEnum ,
             self :: no_exported_imports :: NoExportedImports ,
             self :: no_irregular_whitespace :: NoIrregularWhitespace ,
+            self :: no_octal_escape :: NoOctalEscape ,
             self :: no_process_env :: NoProcessEnv ,
             self :: no_restricted_imports :: NoRestrictedImports ,
             self :: no_restricted_types :: NoRestrictedTypes ,

crates/biome_js_analyze/src/lint/nursery/no_octal_escape.rs

@@ -0,0 +1,84 @@
+use biome_analyze::{
+    context::RuleContext, declare_lint_rule, Ast, Rule, RuleDiagnostic, RuleSource,
+};
+use biome_console::markup;
+use biome_js_syntax::JsStringLiteralExpression;
+use biome_rowan::AstNode;
+
+declare_lint_rule! {
+    /// Disallow octal escape sequences in string literals
+    ///
+    /// As of the ECMAScript 5 specification, octal escape sequences in string literals are deprecated and should not be used.
+    /// Unicode escape sequences should be used instead.
+    ///
+    /// ### Examples
+    ///
+    /// ### Invalid
+    ///
+    /// ```js,expect_diagnostic
+    /// var foo = "Copyright \251";
+    /// ```
+    ///
+    /// ### Valid
+    ///
+    /// ```js
+    /// var foo = "Copyright \u00A9";   // unicode
+    ///
+    /// var foo = "Copyright \xA9";     // hexadecimal
+    /// ```
+    ///
+    pub NoOctalEscape {
+        version: "next",
+        name: "noOctalEscape",
+        language: "js",
+        sources: &[RuleSource::Eslint("no-octal-escape")],
+        recommended: false,
+    }
+}
+
+impl Rule for NoOctalEscape {
+    type Query = Ast<JsStringLiteralExpression>;
+    type State = ();
+    type Signals = Option<Self::State>;
+    type Options = ();
+
+    fn run(ctx: &RuleContext<Self>) -> Self::Signals {
+        let node = ctx.query();
+        let token = node.value_token().ok()?;
+        let text = token.text();
+
+        let bytes = text.as_bytes();
+        let mut byte_it = bytes.iter();
+        while let Some(&byte) = byte_it.next() {
+            if byte == b'\\' {
+                if let Some(&next_byte) = byte_it.next() {
+                    if (b'0'..=b'7').contains(&next_byte) {
+                        return Some(());
+                    }
+                }
+            }
+        }
+        None
+    }
+
+    fn diagnostic(ctx: &RuleContext<Self>, _state: &Self::State) -> Option<RuleDiagnostic> {
+        let node = ctx.query();
+        let token = node.value_token().ok()?;
+        let text = token.text();
+        Some(
+            RuleDiagnostic::new(
+                rule_category!(),
+                node.range(),
+                markup! {
+                    "Don't use "<Emphasis>"octal"</Emphasis>
+                },
+            )
+            .note(markup! {
+                "Don't use octal escape sequences: " {text}
+            })
+            .note(markup! {
+                "Use unicode or hexidecimal escape sequences instead."
+            }),
+        )
+    }
+}

crates/biome_js_analyze/tests/specs/nursery/noOctalEscape/invalid.js

@@ -0,0 +1,64 @@
+var foo = "foo \01 bar";
+var foo = "foo \000 bar";
+var foo = "foo \377 bar";
+var foo = "foo \378 bar";
+var foo = "foo \37a bar";
+var foo = "foo \381 bar";
+var foo = "foo \3a1 bar";
+var foo = "foo \251 bar";
+var foo = "foo \258 bar";
+var foo = "foo \25a bar";
+var foo = "\3s51";
+var foo = "\77";
+var foo = "\78";
+var foo = "\5a";
+var foo = "\751";
+var foo = "foo \400 bar";
+var foo = "foo \400 bar";
+var foo = "\t\1";
+var foo = "\\\751";
+'\0\1'
+'\0 \1'
+'\0\01'
+'\0 \01'
+'\0a\1'
+'\0a\01'
+'\0\08'
+'\1'
+'\2'
+'\7'
+'\00'
+'\01'
+'\02'
+'\07'
+'\08'
+'\09'
+'\10'
+'\12'
+' \1'
+'\1 '
+'a\1'
+'\1a'
+'a\1a'
+' \01'
+'\01 '
+'a\01'
+'\01a'
+'a\01a'
+'a\08a'
+'\n\1'
+'\n\01'
+'\n\08'
+'\\\1'
+'\\\01'
+'\\\08'
+'\\n\1'
+'\01\02'
+'\02\01'
+'\01\2'
+'\2\01'
+'\08\1'
+'foo \1 bar \2'
+
+
+