Report symbol literals in Naming/AsciiIdentifiers rule

spec/ameba/rule/naming/ascii_identifiers_spec.cr

@@ -49,13 +49,35 @@ module Ameba::Rule::Naming
         CRYSTAL
     end
 
+    it "reports defs with parameter default values containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        def forest_adventure(animal_type = :🐺)
+                                         # ^^ error: Identifier contains non-ascii characters
+        end
+        CRYSTAL
+    end
+
     it "reports argument names containing non-ascii characters" do
       expect_issue subject, <<-CRYSTAL
         %w[wensleydale cheddar brie].each { |🧀| nil }
                                            # ^ error: Identifier contains non-ascii characters
         CRYSTAL
     end
 
+    it "reports calls with arguments containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        %i[🐺 🐿].index!(:🐺)
+                     # ^^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
+    it "reports calls with named arguments containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        %i[🐺 🐿].index!(obj: :🐺)
+                          # ^^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
     it "reports aliases with names containing non-ascii characters" do
       expect_issue subject, <<-CRYSTAL
         alias JSON🧀 = JSON::Any
@@ -84,11 +106,46 @@ module Ameba::Rule::Naming
         CRYSTAL
     end
 
+    it "reports assignments with symbol literals containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        foo = :신장
+            # ^^^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
+    it "reports multiple assignments with symbol literals containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        foo, bar = :신장, true
+                 # ^^^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
     it "passes for strings with non-ascii characters" do
       expect_no_issues subject, <<-CRYSTAL
         space = "👾"
         space = :invader # 👾
         CRYSTAL
     end
+
+    context "properties" do
+      context "#ignore_symbols" do
+        it "returns `false` by default" do
+          rule = AsciiIdentifiers.new
+          rule.ignore_symbols?.should be_false
+        end
+
+        it "stops reporting symbol literals if set to `true`" do
+          rule = AsciiIdentifiers.new
+          rule.ignore_symbols = true
+
+          expect_no_issues rule, <<-CRYSTAL
+            def forest_adventure(animal_type = :🐺); end
+            %i[🐺 🐿].index!(:🐺)
+            foo, bar = :신장, true
+            foo = :신장
+            CRYSTAL
+        end
+      end
+    end
   end
 end

src/ameba/ast/visitors/node_visitor.cr

@@ -32,6 +32,7 @@ module Ameba::AST
       IsA,
       LibDef,
       ModuleDef,
+      MultiAssign,
       NilLiteral,
       StringInterpolation,
       Unless,

src/ameba/rule/naming/ascii_identifiers.cr

@@ -20,10 +20,12 @@ module Ameba::Rule::Naming
   # ```
   # Naming/AsciiIdentifiers:
   #   Enabled: true
+  #   IgnoreSymbols: false
   # ```
   class AsciiIdentifiers < Base
     properties do
       description "Disallows non-ascii characters in identifiers"
+      ignore_symbols false
     end
 
     MSG = "Identifier contains non-ascii characters"
@@ -32,11 +34,21 @@ module Ameba::Rule::Naming
       if (target = node.target).is_a?(Crystal::Path)
         check_issue(source, target, target)
       end
+      check_symbol_literal(source, node.value)
     end
 
     def test(source, node : Crystal::MultiAssign)
-      node.targets.each do |target|
-        check_issue(source, target, target)
+      node.values.each do |value|
+        check_symbol_literal(source, value)
+      end
+    end
+
+    def test(source, node : Crystal::Call)
+      node.args.each do |arg|
+        check_symbol_literal(source, arg)
+      end
+      node.named_args.try &.each do |arg|
+        check_symbol_literal(source, arg.value)
       end
     end
 
@@ -45,6 +57,7 @@ module Ameba::Rule::Naming
 
       node.args.each do |arg|
         check_issue(source, arg, prefer_name_location: true)
+        check_symbol_literal(source, arg.default_value)
       end
     end
 
@@ -56,6 +69,13 @@ module Ameba::Rule::Naming
       check_issue(source, node.name, node.name)
     end
 
+    private def check_symbol_literal(source, node)
+      return if ignore_symbols?
+      return unless node.is_a?(Crystal::SymbolLiteral)
+
+      check_issue(source, node, node.value)
+    end
+
     private def check_issue(source, location, end_location, name)
       issue_for location, end_location, MSG unless name.to_s.ascii_only?
     end