Add compatibility with --enable-frozen-string-literal

Fix: #168 Ref: https://bugs.ruby-lang.org/issues/20205 Ruby 3.4 will emit deprecation warnings when mutating string literals, and a future version is likely to make frozen string literals the default.
boazsegev · Mar 28, 2024 · bd8d5ef · bd8d5ef
1 parent fe11372
commit bd8d5ef
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Showing 15 changed files with 24 additions and 6 deletions.
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -9,7 +9,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["2.7", "3.0", "3.1", "3.2"]
+        ruby: ["2.7", "3.0", "3.1", "3.2", "3.3"]
+        rubyopt: [""]
+        include:
+          ruby: "3.3"
+          rubyopt: "--enable-frozen-string-literal --debug-frozen-string-literal"
 
     steps:
       - name: Checkout code

diff --git a/lib/combine_pdf.rb b/lib/combine_pdf.rb
@@ -1,4 +1,5 @@
 # -*- encoding : utf-8 -*-
+# frozen_string_literal: true
 
 require 'zlib'
 require 'securerandom'

diff --git a/lib/combine_pdf/api.rb b/lib/combine_pdf/api.rb
@@ -1,4 +1,5 @@
 # -*- encoding : utf-8 -*-
+# frozen_string_literal: true
 
 module CombinePDF
   module_function

diff --git a/lib/combine_pdf/basic_writer.rb b/lib/combine_pdf/basic_writer.rb
@@ -1,4 +1,5 @@
 # -*- encoding : utf-8 -*-
+# frozen_string_literal: true
 ########################################################
 ## Thoughts from reading the ISO 32000-1:2008
 ## this file is part of the CombinePDF library and the code

diff --git a/lib/combine_pdf/decrypt.rb b/lib/combine_pdf/decrypt.rb
@@ -1,4 +1,5 @@
 # -*- encoding : utf-8 -*-
+# frozen_string_literal: true
 ########################################################
 ## Thoughts from reading the ISO 32000-1:2008
 ## this file is part of the CombinePDF library and the code
@@ -137,7 +138,7 @@ def decrypt_AES(encrypted, encrypted_id, encrypted_generation, _encrypted_filter
       object_key = @key.dup
       object_key << [encrypted_id].pack('i')[0..2]
       object_key << [encrypted_generation].pack('i')[0..1]
-      object_key << 'sAlT'.force_encoding(Encoding::ASCII_8BIT)
+      object_key << 'sAlT'.b
       key_length = object_key.length < 16 ? object_key.length : 16
 
       begin

diff --git a/lib/combine_pdf/exceptions.rb b/lib/combine_pdf/exceptions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module CombinePDF
   class EncryptionError < StandardError
   end

diff --git a/lib/combine_pdf/filter.rb b/lib/combine_pdf/filter.rb
@@ -1,4 +1,5 @@
 # -*- encoding : utf-8 -*-
+# frozen_string_literal: true
 ########################################################
 ## Thoughts from reading the ISO 32000-1:2008
 ## this file is part of the CombinePDF library and the code

diff --git a/lib/combine_pdf/fonts.rb b/lib/combine_pdf/fonts.rb
@@ -1,4 +1,5 @@
 # -*- encoding : utf-8 -*-
+# frozen_string_literal: true
 ########################################################
 ## Thoughts from reading the ISO 32000-1:2008
 ## this file is part of the CombinePDF library and the code

diff --git a/lib/combine_pdf/page_methods.rb b/lib/combine_pdf/page_methods.rb
@@ -1,4 +1,5 @@
 # -*- encoding : utf-8 -*-
+# frozen_string_literal: true
 ########################################################
 ## Thoughts from reading the ISO 32000-1:2008
 ## this file is part of the CombinePDF library and the code

diff --git a/lib/combine_pdf/parser.rb b/lib/combine_pdf/parser.rb
@@ -262,7 +262,7 @@ def _parse_
         ##########################################
         elsif @scanner.scan(/\(/)
           # warn "Found a literal string"
-          str = ''.force_encoding(Encoding::ASCII_8BIT)
+          str = ''.b
           count = 1
           while count > 0 && @scanner.rest?
             scn = @scanner.scan_until(/[\(\)]/)

diff --git a/lib/combine_pdf/pdf_protected.rb b/lib/combine_pdf/pdf_protected.rb
@@ -1,4 +1,5 @@
 # -*- encoding : utf-8 -*-
+# frozen_string_literal: true
 ########################################################
 ## Thoughts from reading the ISO 32000-1:2008
 ## this file is part of the CombinePDF library and the code

diff --git a/lib/combine_pdf/pdf_public.rb b/lib/combine_pdf/pdf_public.rb
@@ -1,5 +1,6 @@
 # -*- encoding : utf-8 -*-
-########################################################
+## frozen_string_literal: true
+#######################################################
 ## Thoughts from reading the ISO 32000-1:2008
 ## this file is part of the CombinePDF library and the code
 ## is subject to the same license.

diff --git a/lib/combine_pdf/renderer.rb b/lib/combine_pdf/renderer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module CombinePDF
   ################################################################
   ## These are common functions, used within the different classes

diff --git a/lib/combine_pdf/version.rb b/lib/combine_pdf/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module CombinePDF
-  VERSION = '1.0.26'.freeze
+  VERSION = '1.0.26'
 end
diff --git a/test/combine_pdf/renderer_test.rb b/test/combine_pdf/renderer_test.rb
@@ -12,7 +12,7 @@ def test_object(object)
 
   def test_numeric_array_to_pdf
     input = [1.234567, 0.000054, 5, -0.000099]
-    expected = "[1.234567 0.000054 5 -0.000099]".force_encoding('BINARY')
+    expected = "[1.234567 0.000054 5 -0.000099]".b
     actual = TestRenderer.new.test_object(input)
 
     assert_equal(expected, actual)