Add cop Style/RegexpLiteralMixedPreserve [RUN AS-IF-FOSS]

.rubocop.yml

@@ -644,3 +644,16 @@ Cop/UserAdmin:
 Performance/OpenStruct:
   Exclude:
     - 'ee/spec/**/*.rb'
+
+# See https://gitlab.com/gitlab-org/gitlab/-/issues/327495
+Style/RegexpLiteral:
+  Enabled: false
+
+Style/RegexpLiteralMixedPreserve:
+  Enabled: true
+  SupportedStyles:
+    - slashes
+    - percent_r
+    - mixed
+    - mixed_preserve
+  EnforcedStyle: mixed_preserve

.rubocop_manual_todo.yml

@@ -3337,3 +3337,60 @@ Gitlab/FeatureAvailableUsage:
     - 'ee/spec/models/project_spec.rb'
     - 'lib/api/helpers/related_resources_helpers.rb'
     - 'spec/models/concerns/featurable_spec.rb'
+
+# WIP See https://gitlab.com/gitlab-org/gitlab/-/issues/327490
+Style/RegexpLiteralMixedPreserve:
+  Exclude:
+    - 'app/controllers/projects/repositories_controller.rb'
+    - 'app/helpers/ci/variables_helper.rb'
+    - 'app/models/alert_management/alert.rb'
+    - 'app/models/application_setting.rb'
+    - 'app/models/blob_viewer/go_mod.rb'
+    - 'app/models/concerns/ci/maskable.rb'
+    - 'app/models/operations/feature_flag.rb'
+    - 'app/models/packages/go/module.rb'
+    - 'app/models/project_services/chat_message/base_message.rb'
+    - 'app/services/packages/conan/search_service.rb'
+    - 'app/services/projects/update_remote_mirror_service.rb'
+    - 'config/initializers/rspec_profiling.rb'
+    - 'ee/app/models/status_page/project_setting.rb'
+    - 'ee/app/presenters/vulnerability_presenter.rb'
+    - 'ee/lib/api/geo_nodes.rb'
+    - 'ee/lib/gitlab/vulnerabilities/standard_vulnerability.rb'
+    - 'ee/spec/controllers/concerns/ee/routable_actions/sso_enforcement_redirect_spec.rb'
+    - 'ee/spec/controllers/concerns/routable_actions_spec.rb'
+    - 'ee/spec/controllers/groups/groups_controller_spec.rb'
+    - 'ee/spec/features/groups/saml_enforcement_spec.rb'
+    - 'ee/spec/features/markdown/metrics_spec.rb'
+    - 'ee/spec/lib/gitlab/database/load_balancing/load_balancer_spec.rb'
+    - 'ee/spec/models/project_services/jira_service_spec.rb'
+    - 'ee/spec/services/jira/requests/issues/list_service_spec.rb'
+    - 'lib/api/invitations.rb'
+    - 'lib/gitlab/ci/pipeline/expression/lexeme/pattern.rb'
+    - 'lib/gitlab/metrics/requests_rack_middleware.rb'
+    - 'lib/gitlab/metrics/subscribers/active_record.rb'
+    - 'lib/gitlab/regex.rb'
+    - 'lib/gitlab/utils.rb'
+    - 'lib/product_analytics/tracker.rb'
+    - 'qa/qa/page/project/settings/advanced.rb'
+    - 'qa/spec/service/docker_run/gitlab_runner_spec.rb'
+    - 'rubocop/cop/gitlab/duplicate_spec_location.rb'
+    - 'spec/features/clusters/cluster_health_dashboard_spec.rb'
+    - 'spec/features/markdown/metrics_spec.rb'
+    - 'spec/features/search/user_searches_for_code_spec.rb'
+    - 'spec/features/snippets/embedded_snippet_spec.rb'
+    - 'spec/helpers/diff_helper_spec.rb'
+    - 'spec/helpers/releases_helper_spec.rb'
+    - 'spec/lib/gitlab/ci/reports/test_case_spec.rb'
+    - 'spec/lib/gitlab/consul/internal_spec.rb'
+    - 'spec/lib/gitlab/import_export/shared_spec.rb'
+    - 'spec/lib/gitlab/utils/usage_data_spec.rb'
+    - 'spec/presenters/ci/build_runner_presenter_spec.rb'
+    - 'spec/requests/api/projects_spec.rb'
+    - 'spec/services/jira/requests/projects/list_service_spec.rb'
+    - 'spec/support/capybara.rb'
+    - 'spec/support/helpers/grafana_api_helpers.rb'
+    - 'spec/support/helpers/query_recorder.rb'
+    - 'spec/support/helpers/require_migration.rb'
+    - 'spec/support/shared_examples/models/slack_mattermost_notifications_shared_examples.rb'
+    - 'spec/views/layouts/_head.html.haml_spec.rb'

.rubocop_todo.yml

@@ -922,13 +922,6 @@ Style/RedundantRegexpEscape:
 Style/RedundantSelf:
   Enabled: false
 
-# Offense count: 213
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, AllowInnerSlashes.
-# SupportedStyles: slashes, percent_r, mixed
-Style/RegexpLiteral:
-  Enabled: false
-
 # Offense count: 53
 # Cop supports --auto-correct.
 Style/RescueModifier:

app/views/projects/show.html.haml

-- current_route_path = request.fullpath.match(/-\/tree\/[^\/]+\/(.+$)/).to_a[1]
+- current_route_path = request.fullpath.match(%r{-/tree/[^/]+/(.+$)}).to_a[1]
 - add_page_startup_graphql_call('repository/path_last_commit', { projectPath: @project.full_path, ref: current_ref, path: current_route_path || "" })
 - @content_class = "limit-container-width" unless fluid_layout
 - @skip_current_level_breadcrumb = true

app/views/projects/tree/show.html.haml

-- current_route_path = request.fullpath.match(/-\/tree\/[^\/]+\/(.+$)/).to_a[1]
+- current_route_path = request.fullpath.match(%r{-/tree/[^/]+/(.+$)}).to_a[1]
 - add_page_startup_graphql_call('repository/path_last_commit', { projectPath: @project.full_path, ref: current_ref, path: current_route_path || "" })
 - add_page_startup_graphql_call('repository/permissions', { projectPath: @project.full_path })
 - add_page_startup_graphql_call('repository/files', { nextPageCursor: "", pageSize: 100, projectPath: @project.full_path, ref: current_ref, path: current_route_path || "/"})

rubocop/cop/style/regexp_literal_mixed_preserve.rb

+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    module Style
+      # This cop is based on `Style/RegexpLiteral` but adds a new
+      # `EnforcedStyle` option `mixed_preserve`.
+      #
+      # This cop will be removed once the upstream PR is merged and RuboCop upgraded.
+      #
+      # See https://github.com/rubocop/rubocop/pull/9688
+      class RegexpLiteralMixedPreserve < RuboCop::Cop::Style::RegexpLiteral
+        module Patch
+          private
+
+          def allowed_slash_literal?(node)
+            super || allowed_mixed_preserve?(node)
+          end
+
+          def allowed_percent_r_literal?(node)
+            super || allowed_mixed_preserve?(node)
+          end
+
+          def allowed_mixed_preserve?(node)
+            style == :mixed_preserve && !contains_disallowed_slash?(node)
+          end
+        end
+
+        prepend Patch
+      end
+    end
+  end
+end

spec/rubocop/cop/style/regexp_literal_mixed_preserve_spec.rb

+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+require_relative '../../../../rubocop/cop/style/regexp_literal_mixed_preserve'
+
+# This spec contains only relevant examples.
+#
+# See also https://github.com/rubocop/rubocop/pull/9688
+RSpec.describe RuboCop::Cop::Style::RegexpLiteralMixedPreserve, :config do
+  let(:config) do
+    supported_styles = { 'SupportedStyles' => %w[slashes percent_r mixed mixed_preserve] }
+    RuboCop::Config.new('Style/PercentLiteralDelimiters' =>
+                          percent_literal_delimiters_config,
+                        'Style/RegexpLiteralMixedPreserve' =>
+                          cop_config.merge(supported_styles))
+  end
+
+  let(:percent_literal_delimiters_config) { { 'PreferredDelimiters' => { '%r' => '{}' } } }
+
+  context 'when EnforcedStyle is set to mixed_preserve' do
+    let(:cop_config) { { 'EnforcedStyle' => 'mixed_preserve' } }
+
+    describe 'a single-line `//` regex without slashes' do
+      it 'is accepted' do
+        expect_no_offenses('foo = /a/')
+      end
+    end
+
+    describe 'a single-line `//` regex with slashes' do
+      it 'registers an offense and corrects' do
+        expect_offense(<<~'RUBY')
+          foo = /home\//
+                ^^^^^^^^ Use `%r` around regular expression.
+        RUBY
+
+        expect_correction(<<~'RUBY')
+          foo = %r{home/}
+        RUBY
+      end
+
+      describe 'when configured to allow inner slashes' do
+        before do
+          cop_config['AllowInnerSlashes'] = true
+        end
+
+        it 'is accepted' do
+          expect_no_offenses('foo = /home\\//')
+        end
+      end
+    end
+
+    describe 'a multi-line `//` regex without slashes' do
+      it 'is accepted' do
+        expect_no_offenses(<<~'RUBY')
+          foo = /
+            foo
+            bar
+          /x
+        RUBY
+      end
+    end
+
+    describe 'a multi-line `//` regex with slashes' do
+      it 'registers an offense and corrects' do
+        expect_offense(<<~'RUBY')
+          foo = /
+                ^ Use `%r` around regular expression.
+            https?:\/\/
+            example\.com
+          /x
+        RUBY
+
+        expect_correction(<<~'RUBY')
+          foo = %r{
+            https?://
+            example\.com
+          }x
+        RUBY
+      end
+    end
+
+    describe 'a single-line %r regex without slashes' do
+      it 'is accepted' do
+        expect_no_offenses(<<~RUBY)
+          foo = %r{a}
+        RUBY
+      end
+    end
+
+    describe 'a single-line %r regex with slashes' do
+      it 'is accepted' do
+        expect_no_offenses('foo = %r{home/}')
+      end
+
+      describe 'when configured to allow inner slashes' do
+        before do
+          cop_config['AllowInnerSlashes'] = true
+        end
+
+        it 'is accepted' do
+          expect_no_offenses(<<~RUBY)
+            foo = %r{home/}
+          RUBY
+        end
+      end
+    end
+
+    describe 'a multi-line %r regex without slashes' do
+      it 'is accepted' do
+        expect_no_offenses(<<~RUBY)
+          foo = %r{
+            foo
+            bar
+          }x
+        RUBY
+      end
+    end
+
+    describe 'a multi-line %r regex with slashes' do
+      it 'is accepted' do
+        expect_no_offenses(<<~RUBY)
+          foo = %r{
+            https?://
+            example\.com
+          }x
+        RUBY
+      end
+    end
+  end
+end