Use frozen string literals

Co-authored-by: Jean Boussier <jean.boussier@gmail.com>

ext/json/lib/json.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 require 'json/common'
 
 ##

ext/json/lib/json/add/bigdecimal.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/complex.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/core.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 # This file requires the implementations of ruby core's custom objects for
 # serialisation/deserialisation.
 

ext/json/lib/json/add/date.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/date_time.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/exception.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/ostruct.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/range.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/rational.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/regexp.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/struct.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/symbol.rb

@@ -1,5 +1,4 @@
-
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/add/time.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end

ext/json/lib/json/common.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+#frozen_string_literal: true
 require 'json/version'
 
 module JSON
@@ -117,23 +117,17 @@ module JSON
     attr_accessor :state
   end
 
-  DEFAULT_CREATE_ID = 'json_class'.freeze
-  private_constant :DEFAULT_CREATE_ID
-
-  CREATE_ID_TLS_KEY = "JSON.create_id".freeze
-  private_constant :CREATE_ID_TLS_KEY
-
   # Sets create identifier, which is used to decide if the _json_create_
   # hook of a class should be called; initial value is +json_class+:
   #   JSON.create_id # => 'json_class'
   def self.create_id=(new_value)
-    Thread.current[CREATE_ID_TLS_KEY] = new_value.dup.freeze
+    Thread.current[:"JSON.create_id"] = new_value.dup.freeze
   end
 
   # Returns the current create identifier.
   # See also JSON.create_id=.
   def self.create_id
-    Thread.current[CREATE_ID_TLS_KEY] || DEFAULT_CREATE_ID
+    Thread.current[:"JSON.create_id"] || 'json_class'
   end
 
   NaN           = 0.0/0

ext/json/lib/json/generic_object.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 begin
   require 'ostruct'
 rescue LoadError

ext/json/lib/json/version.rb

@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 module JSON
   # JSON version
   VERSION         = '2.7.2'

ext/json/parser/extconf.rb

@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 require 'mkmf'
 
 have_func("rb_enc_raise", "ruby.h")

test/json/json_addition_test.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'test_helper'
 require 'json/add/core'
 require 'json/add/complex'
@@ -114,8 +114,7 @@ class JSONAdditionTest < Test::Unit::TestCase
   end
 
   def test_raw_strings
-    raw = ''
-    raw.respond_to?(:encode!) and raw.encode!(Encoding::ASCII_8BIT)
+    raw = ''.b
     raw_array = []
     for i in 0..255
       raw << i

test/json/json_common_interface_test.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'test_helper'
 require 'stringio'
 require 'tempfile'

test/json/json_encoding_test.rb

@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'test_helper'
 
 class JSONEncodingTest < Test::Unit::TestCase
@@ -26,8 +26,8 @@ class JSONEncodingTest < Test::Unit::TestCase
   end
 
   def test_generate
-    assert_equal @generated, JSON.generate(@parsed, :ascii_only => true)
-    assert_equal @generated, JSON.generate(@utf_16_data, :ascii_only => true)
+    assert_equal @generated, JSON.generate(@parsed, ascii_only: true)
+    assert_equal @generated, JSON.generate(@utf_16_data, ascii_only: true)
   end
 
   def test_unicode
@@ -39,35 +39,35 @@ class JSONEncodingTest < Test::Unit::TestCase
     assert_equal "\"#{0x7f.chr}\"", 0x7f.chr.to_json
     utf8 = [ "© ≠ €! \01" ]
     json = '["© ≠ €! \u0001"]'
-    assert_equal json, utf8.to_json(:ascii_only => false)
+    assert_equal json, utf8.to_json(ascii_only: false)
     assert_equal utf8, parse(json)
     json = '["\u00a9 \u2260 \u20ac! \u0001"]'
-    assert_equal json, utf8.to_json(:ascii_only => true)
+    assert_equal json, utf8.to_json(ascii_only: true)
     assert_equal utf8, parse(json)
     utf8 = ["\343\201\202\343\201\204\343\201\206\343\201\210\343\201\212"]
     json = "[\"\343\201\202\343\201\204\343\201\206\343\201\210\343\201\212\"]"
     assert_equal utf8, parse(json)
-    assert_equal json, utf8.to_json(:ascii_only => false)
+    assert_equal json, utf8.to_json(ascii_only: false)
     utf8 = ["\343\201\202\343\201\204\343\201\206\343\201\210\343\201\212"]
     assert_equal utf8, parse(json)
     json = "[\"\\u3042\\u3044\\u3046\\u3048\\u304a\"]"
-    assert_equal json, utf8.to_json(:ascii_only => true)
+    assert_equal json, utf8.to_json(ascii_only: true)
     assert_equal utf8, parse(json)
     utf8 = ['საქართველო']
     json = '["საქართველო"]'
-    assert_equal json, utf8.to_json(:ascii_only => false)
+    assert_equal json, utf8.to_json(ascii_only: false)
     json = "[\"\\u10e1\\u10d0\\u10e5\\u10d0\\u10e0\\u10d7\\u10d5\\u10d4\\u10da\\u10dd\"]"
-    assert_equal json, utf8.to_json(:ascii_only => true)
+    assert_equal json, utf8.to_json(ascii_only: true)
     assert_equal utf8, parse(json)
-    assert_equal '["Ã"]', generate(["Ã"], :ascii_only => false)
-    assert_equal '["\\u00c3"]', generate(["Ã"], :ascii_only => true)
+    assert_equal '["Ã"]', generate(["Ã"], ascii_only: false)
+    assert_equal '["\\u00c3"]', generate(["Ã"], ascii_only: true)
     assert_equal ["€"], parse('["\u20ac"]')
     utf8 = ["\xf0\xa0\x80\x81"]
     json = "[\"\xf0\xa0\x80\x81\"]"
-    assert_equal json, generate(utf8, :ascii_only => false)
+    assert_equal json, generate(utf8, ascii_only: false)
     assert_equal utf8, parse(json)
     json = '["\ud840\udc01"]'
-    assert_equal json, generate(utf8, :ascii_only => true)
+    assert_equal json, generate(utf8, ascii_only: true)
     assert_equal utf8, parse(json)
     assert_raise(JSON::ParserError) { parse('"\u"') }
     assert_raise(JSON::ParserError) { parse('"\ud800"') }
@@ -75,21 +75,21 @@ class JSONEncodingTest < Test::Unit::TestCase
 
   def test_chars
     (0..0x7f).each do |i|
-      json = '["\u%04x"]' % i
+      json = '"\u%04x"' % i
       i = i.chr
-      assert_equal i, parse(json).first[0]
+      assert_equal i, parse(json)[0]
       if i == ?\b
-        generated = generate(["" << i])
-        assert '["\b"]' == generated || '["\10"]' == generated
+        generated = generate(i)
+        assert '"\b"' == generated || '"\10"' == generated
       elsif [?\n, ?\r, ?\t, ?\f].include?(i)
-        assert_equal '[' << ('' << i).dump << ']', generate(["" << i])
+        assert_equal i.dump, generate(i)
       elsif i.chr < 0x20.chr
-        assert_equal json, generate(["" << i])
+        assert_equal json, generate(i)
       end
     end
     assert_raise(JSON::GeneratorError) do
-      generate(["\x80"], :ascii_only => true)
+      generate(["\x80"], ascii_only: true)
     end
-    assert_equal "\302\200", parse('["\u0080"]').first
+    assert_equal "\302\200", parse('"\u0080"')
   end
 end

test/json/json_ext_parser_test.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'test_helper'
 
 class JSONExtParserTest < Test::Unit::TestCase

test/json/json_fixtures_test.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'test_helper'
 
 class JSONFixturesTest < Test::Unit::TestCase

test/json/json_generator_test.rb

@@ -1,5 +1,5 @@
 #!/usr/bin/env ruby
-# frozen_string_literal: false
+# frozen_string_literal: true
 
 require_relative 'test_helper'
 
@@ -304,12 +304,12 @@ EOT
     state.configure(:indent => '1')
     assert_equal '1', state.indent
     state = JSON.state.new
-    foo = 'foo'
+    foo = 'foo'.dup
     assert_raise(TypeError) do
       state.configure(foo)
     end
     def foo.to_h
-      { :indent => '2' }
+      { indent: '2' }
     end
     state.configure(foo)
     assert_equal '2', state.indent

test/json/json_generic_object_test.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'test_helper'
 
 class JSONGenericObjectTest < Test::Unit::TestCase

test/json/json_parser_test.rb

@@ -1,5 +1,4 @@
-# encoding: utf-8
-# frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'test_helper'
 require 'stringio'
 require 'tempfile'
@@ -36,7 +35,8 @@ class JSONParserTest < Test::Unit::TestCase
     pend if RUBY_ENGINE == 'truffleruby'
 
     bug10705 = '[ruby-core:67386] [Bug #10705]'
-    json = ".\"\xE2\x88\x9A\"".force_encoding(Encoding::UTF_8)
+    json = ".\"\xE2\x88\x9A\""
+    assert_equal(Encoding::UTF_8, json.encoding)
     e = assert_raise(JSON::ParserError) {
       JSON::Ext::Parser.new(json).parse
     }

test/json/json_string_matching_test.rb

@@ -1,4 +1,4 @@
-#frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'test_helper'
 require 'time'
 

test/json/ractor_test.rb

@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 
 require_relative 'test_helper'