revert adding psych as runtime dependency

CHANGELOG.md

@@ -34,6 +34,7 @@
 * [#6917](https://github.com/rubocop-hq/rubocop/issues/6917): Bump Bundler dependency to >= 1.15.0. ([@koic][])
 * Add `--auto-gen-only-exclude` to the command outputted in `rubocop_todo.yml` if the option is specified. ([@dvandersluis][])
 * [#6887](https://github.com/rubocop-hq/rubocop/pull/6887): Allow `Lint/UnderscorePrefixedVariableName` cop to be configured to allow use of block keyword args. ([@dduugg][])
+* [#6885](https://github.com/rubocop-hq/rubocop/pull/6885): Revert adding psych >= 3.1 as runtime dependency. ([@andreaseger][])
 
 ## 0.67.2 (2019-04-05)
 
@@ -3963,3 +3964,4 @@
 [@Mange]: https://github.com/Mange
 [@jmanian]: https://github.com/jmanian
 [@vfonic]: https://github.com/vfonic
+[@andreaseger]: https://github.com/andreaseger

lib/rubocop/config_loader.rb

@@ -206,10 +206,16 @@ def check_duplication(yaml_code, absolute_path)
         smart_path = PathUtil.smart_path(absolute_path)
         YAMLDuplicationChecker.check(yaml_code, absolute_path) do |key1, key2|
           value = key1.value
-          line1 = key1.start_line + 1
-          line2 = key2.start_line + 1
-          message = "#{smart_path}:#{line1}: " \
-                    "`#{value}` is concealed by line #{line2}"
+          # .start_line is only available since ruby 2.5 / psych 3.0
+          message = if key1.respond_to? :start_line
+                      line1 = key1.start_line + 1
+                      line2 = key2.start_line + 1
+                      "#{smart_path}:#{line1}: " \
+                      "`#{value}` is concealed by line #{line2}"
+                    else
+                      "#{smart_path}: " \
+                        "`#{value}` is concealed by duplicate"
+                    end
           warn Rainbow(message).yellow
         end
       end
@@ -228,14 +234,17 @@ def yaml_safe_load(yaml_code, filename)
         if defined?(SafeYAML) && SafeYAML.respond_to?(:load)
           SafeYAML.load(yaml_code, filename,
                         whitelisted_tags: %w[!ruby/regexp])
-        else
+        # Ruby 2.6+
+        elsif Gem::Version.new(Psych::VERSION) >= Gem::Version.new('3.1.0')
           YAML.safe_load(
             yaml_code,
             permitted_classes: [Regexp, Symbol],
             permitted_symbols: [],
             aliases: false,
             filename: filename
           )
+        else
+          YAML.safe_load(yaml_code, [Regexp, Symbol], [], false, filename)
         end
       end
     end

lib/rubocop/yaml_duplication_checker.rb

@@ -5,7 +5,7 @@ module RuboCop
   module YAMLDuplicationChecker
     def self.check(yaml_string, filename, &on_duplicated)
       # Specify filename to display helpful message when it raises an error.
-      tree = YAML.parse(yaml_string, filename: filename)
+      tree = YAML.parse(yaml_string, filename)
       return unless tree
 
       traverse(tree, &on_duplicated)

rubocop.gemspec

@@ -36,7 +36,6 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency('jaro_winkler', '~> 1.5.1')
   s.add_runtime_dependency('parallel', '~> 1.10')
   s.add_runtime_dependency('parser', '>= 2.5', '!= 2.5.1.1')
-  s.add_runtime_dependency('psych', '>= 3.1.0')
   s.add_runtime_dependency('rainbow', '>= 2.2.2', '< 4.0')
   s.add_runtime_dependency('ruby-progressbar', '~> 1.7')
   s.add_runtime_dependency('unicode-display_width', '>= 1.4.0', '< 1.6')

spec/rubocop/config_loader_spec.rb

@@ -1049,19 +1049,39 @@ def cop_enabled?(cop_class)
       end
     end
 
-    context 'when the file has duplicated keys' do
-      it 'outputs a warning' do
-        create_file(configuration_path, <<-YAML.strip_indent)
-          Style/Encoding:
-            Enabled: true
+    context '< Ruby 2.5', if: RUBY_VERSION < '2.5' do
+      context 'when the file has duplicated keys' do
+        it 'outputs a warning' do
+          create_file(configuration_path, <<-YAML.strip_indent)
+            Style/Encoding:
+              Enabled: true
 
-          Style/Encoding:
-            Enabled: false
-        YAML
+            Style/Encoding:
+              Enabled: false
+          YAML
 
-        expect do
-          load_file
-        end.to output(%r{`Style/Encoding` is concealed by line 4}).to_stderr
+          expect do
+            load_file
+          end.to output(%r{`Style/Encoding` is concealed by duplicat}).to_stderr
+        end
+      end
+    end
+
+    context '>= Ruby 2.5', if: RUBY_VERSION >= '2.5' do
+      context 'when the file has duplicated keys' do
+        it 'outputs a warning' do
+          create_file(configuration_path, <<-YAML.strip_indent)
+            Style/Encoding:
+              Enabled: true
+
+            Style/Encoding:
+              Enabled: false
+          YAML
+
+          expect do
+            load_file
+          end.to output(%r{`Style/Encoding` is concealed by line 4}).to_stderr
+        end
       end
     end
   end

spec/rubocop/node_pattern_spec.rb

@@ -127,8 +127,7 @@
 
     describe 'yaml compatibility' do
       let(:instance) do
-        YAML.safe_load(YAML.dump(super()),
-                       permitted_classes: [described_class])
+        YAML.safe_load(YAML.dump(super()), [described_class])
       end
       let(:ruby) { 'obj.method' }
 

spec/rubocop/yaml_duplication_checker_spec.rb

@@ -26,17 +26,32 @@ def check(yaml, &block)
 
     include_examples 'call block'
 
-    it 'calls block with keys' do
-      key1 = nil
-      key2 = nil
-      check(yaml) do |key_a, key_b|
-        key1 = key_a
-        key2 = key_b
+    context '< Ruby 2.5', if: RUBY_VERSION < '2.5' do
+      it 'calls block with keys' do
+        key1 = nil
+        key2 = nil
+        check(yaml) do |key_a, key_b|
+          key1 = key_a
+          key2 = key_b
+        end
+        expect(key1.value).to eq('Layout/Tab')
+        expect(key2.value).to eq('Layout/Tab')
+      end
+    end
+
+    context '>= Ruby 2.5', if: RUBY_VERSION >= '2.5' do
+      it 'calls block with keys' do
+        key1 = nil
+        key2 = nil
+        check(yaml) do |key_a, key_b|
+          key1 = key_a
+          key2 = key_b
+        end
+        expect(key1.start_line).to eq(0)
+        expect(key2.start_line).to eq(3)
+        expect(key1.value).to eq('Layout/Tab')
+        expect(key2.value).to eq('Layout/Tab')
       end
-      expect(key1.start_line).to eq(0)
-      expect(key2.start_line).to eq(3)
-      expect(key1.value).to eq('Layout/Tab')
-      expect(key2.value).to eq('Layout/Tab')
     end
   end
 
@@ -49,17 +64,32 @@ def check(yaml, &block)
 
     include_examples 'call block'
 
-    it 'calls block with keys' do
-      key1 = nil
-      key2 = nil
-      check(yaml) do |key_a, key_b|
-        key1 = key_a
-        key2 = key_b
+    context '< Ruby 2.5', if: RUBY_VERSION < '2.5' do
+      it 'calls block with keys' do
+        key1 = nil
+        key2 = nil
+        check(yaml) do |key_a, key_b|
+          key1 = key_a
+          key2 = key_b
+        end
+        expect(key1.value).to eq('Enabled')
+        expect(key2.value).to eq('Enabled')
+      end
+    end
+
+    context '>= Ruby 2.5', if: RUBY_VERSION >= '2.5' do
+      it 'calls block with keys' do
+        key1 = nil
+        key2 = nil
+        check(yaml) do |key_a, key_b|
+          key1 = key_a
+          key2 = key_b
+        end
+        expect(key1.start_line).to eq(1)
+        expect(key2.start_line).to eq(2)
+        expect(key1.value).to eq('Enabled')
+        expect(key2.value).to eq('Enabled')
       end
-      expect(key1.start_line).to eq(1)
-      expect(key2.start_line).to eq(2)
-      expect(key1.value).to eq('Enabled')
-      expect(key2.value).to eq('Enabled')
     end
   end