[Fix #9874] Fix a false positive for Style/RegexpLiteral

changelog/fix_false_positive_for_style_regexp_literal.md

@@ -0,0 +1 @@
+* [#9874](https://github.com/rubocop/rubocop/issues/9874): Fix a false positive for `Style/RegexpLiteral` when using `%r` regexp literal with `EnforcedStyle: omit_parentheses` of `Style/MethodCallWithArgsParentheses`. ([@koic][])

lib/rubocop/cop/style/regexp_literal.rb

@@ -117,7 +117,7 @@ def allowed_mixed_slash?(node)
         def allowed_percent_r_literal?(node)
           style == :slashes && contains_disallowed_slash?(node) ||
             style == :percent_r ||
-            allowed_mixed_percent_r?(node)
+            allowed_mixed_percent_r?(node) || omit_parentheses_style?(node)
         end
 
         def allowed_mixed_percent_r?(node)
@@ -149,6 +149,14 @@ def preferred_delimiters
           config.for_cop('Style/PercentLiteralDelimiters') ['PreferredDelimiters']['%r'].chars
         end
 
+        def omit_parentheses_style?(node)
+          return false unless node.parent&.call_type?
+
+          enforced_style = config.for_cop('Style/MethodCallWithArgsParentheses')['EnforcedStyle']
+
+          enforced_style == 'omit_parentheses'
+        end
+
         def correct_delimiters(node, corrector)
           replacement = calculate_replacement(node)
           corrector.replace(node.loc.begin, replacement.first)

spec/rubocop/cop/style/regexp_literal_spec.rb

@@ -5,10 +5,13 @@
     supported_styles = { 'SupportedStyles' => %w[slashes percent_r mixed] }
     RuboCop::Config.new('Style/PercentLiteralDelimiters' =>
                           percent_literal_delimiters_config,
+                        'Style/MethodCallWithArgsParentheses' =>
+                          method_call_with_args_parentheses_config,
                         'Style/RegexpLiteral' =>
                           cop_config.merge(supported_styles))
   end
   let(:percent_literal_delimiters_config) { { 'PreferredDelimiters' => { '%r' => '{}' } } }
+  let(:method_call_with_args_parentheses_config) { { 'EnforcedStyle' => 'require_parentheses' } }
 
   describe 'when regex contains slashes in interpolation' do
     let(:cop_config) { { 'EnforcedStyle' => 'slashes' } }
@@ -488,4 +491,108 @@
       end
     end
   end
+
+  context 'when `EnforcedStyle: require_parentheses` of `Style/MethodCallWithArgsParentheses` cop' do
+    let(:method_call_with_args_parentheses_config) { { 'EnforcedStyle' => 'require_parentheses' } }
+
+    context 'when using `%r` regexp with `EnforcedStyle: slashes`' do
+      let(:cop_config) { { 'EnforcedStyle' => 'slashes' } }
+
+      it 'registers an offense when used as a method argument' do
+        expect_offense(<<~RUBY)
+          do_something %r/regexp/
+                       ^^^^^^^^^^ Use `//` around regular expression.
+        RUBY
+      end
+
+      it 'registers an offense when used as a safe navigation method argument' do
+        expect_offense(<<~RUBY)
+          foo&.do_something %r/regexp/
+                            ^^^^^^^^^^ Use `//` around regular expression.
+        RUBY
+      end
+
+      it 'registers an offense when not used as a method argument' do
+        expect_offense(<<~RUBY)
+          %r/regexp/
+          ^^^^^^^^^^ Use `//` around regular expression.
+        RUBY
+      end
+    end
+
+    context 'when using `%r` regexp with `EnforcedStyle: mixed`' do
+      let(:cop_config) { { 'EnforcedStyle' => 'mixed' } }
+
+      it 'registers an offense when used as a method argument' do
+        expect_offense(<<~RUBY)
+          do_something %r/regexp/
+                       ^^^^^^^^^^ Use `//` around regular expression.
+        RUBY
+      end
+
+      it 'registers an offense when used as a safe navigation method argument' do
+        expect_offense(<<~RUBY)
+          foo&.do_something %r/regexp/
+                            ^^^^^^^^^^ Use `//` around regular expression.
+        RUBY
+      end
+
+      it 'registers an offense when not used as a method argument' do
+        expect_offense(<<~RUBY)
+          %r/regexp/
+          ^^^^^^^^^^ Use `//` around regular expression.
+        RUBY
+      end
+    end
+  end
+
+  context 'when `EnforcedStyle: omit_parentheses` of `Style/MethodCallWithArgsParentheses` cop' do
+    let(:method_call_with_args_parentheses_config) { { 'EnforcedStyle' => 'omit_parentheses' } }
+
+    context 'when using `%r` regexp with `EnforcedStyle: slashes`' do
+      let(:cop_config) { { 'EnforcedStyle' => 'slashes' } }
+
+      it 'does not register an offense when used as a method argument' do
+        expect_no_offenses(<<~RUBY)
+          do_something %r/regexp/
+        RUBY
+      end
+
+      it 'does not register an offense when used as a safe navigation method argument' do
+        expect_no_offenses(<<~RUBY)
+          foo&.do_something %r/regexp/
+        RUBY
+      end
+
+      it 'registers an offense when not used as a method argument' do
+        expect_offense(<<~RUBY)
+          %r/regexp/
+          ^^^^^^^^^^ Use `//` around regular expression.
+        RUBY
+      end
+    end
+
+    context 'when using `%r` regexp with `EnforcedStyle: mixed`' do
+      let(:cop_config) { { 'EnforcedStyle' => 'mixed' } }
+
+      it 'does not register an offense when used as a method argument' do
+        expect_no_offenses(<<~RUBY)
+          do_something %r/regexp/
+        RUBY
+      end
+
+      it 'does not register an offense when used as a safe navigation method argument' do
+        expect_no_offenses(<<~RUBY)
+          foo&.do_something %r/regexp/
+        RUBY
+      end
+
+      it 'registers an offense when not used as a method argument' do
+        expect_offense(<<~RUBY)
+          %r/regexp/
+          ^^^^^^^^^^ Use `//` around regular expression.
+        RUBY
+      end
+    end
+  end
 end