https://git.ruby-lang.org/ruby.git/commit/?id=08e70126ae

From 08e70126aeca4edcdeab7dc292acda2f50cc41a1 Mon Sep 17 00:00:00 2001
From: Koichi ITO <koic.ito@g...>
Date: Thu, 4 Jun 2020 12:33:47 +0900
Subject: [ruby/csv] Add `invalid: :replace` for `CSV.open` (#130)

This PR adds `invalid: :replace` for `CSV.open`. It is a PR similar to #129.
https://github.com/ruby/csv/commit/5bf687341c

diff --git a/lib/csv.rb b/lib/csv.rb
index a06c92a..285f719 100644
--- a/lib/csv.rb
+++ b/lib/csv.rb
@@ -962,8 +962,10 @@ class CSV https://github.com/ruby/ruby/blob/trunk/lib/csv.rb#L962
     #
     # possible options elements:
     #   hash form:
-    #     :undef => :replace # replace undefined conversion
-    #     :replace => string # replacement string ("?" or "\uFFFD" if not specified)
+    #     :invalid => nil      # raise error on invalid byte sequence (default)
+    #     :invalid => :replace # replace invalid byte sequence
+    #     :undef => :replace   # replace undefined conversion
+    #     :replace => string   # replacement string ("?" or "\uFFFD" if not specified)
     #
     # This method opens an IO object, and wraps that with CSV. This is intended
     # as the primary interface for writing a CSV file.
@@ -1026,6 +1028,7 @@ class CSV https://github.com/ruby/ruby/blob/trunk/lib/csv.rb#L1028
       # wrap a File opened with the remaining +args+ with no newline
       # decorator
       file_opts = {universal_newline: false}.merge(options)
+      options.delete(:invalid)
       options.delete(:undef)
       options.delete(:replace)
 
diff --git a/test/csv/interface/test_read.rb b/test/csv/interface/test_read.rb
index a2bcced..b86c54f 100644
--- a/test/csv/interface/test_read.rb
+++ b/test/csv/interface/test_read.rb
@@ -135,6 +135,36 @@ class TestCSVInterfaceRead < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/csv/interface/test_read.rb#L135
     end
   end
 
+  def test_open_with_invalid_nil
+    CSV.open(@input.path, "w", encoding: Encoding::CP932, invalid: nil) do |rows|
+      error = assert_raise(Encoding::InvalidByteSequenceError) do
+        rows << ["\x82\xa0"]
+      end
+      assert_equal('"\x82" on UTF-8',
+                   error.message)
+    end
+  end
+
+  def test_open_with_invalid_replace
+    CSV.open(@input.path, "w", encoding: Encoding::CP932, invalid: :replace) do |rows|
+      rows << ["\x82\xa0".force_encoding(Encoding::UTF_8)]
+    end
+    CSV.open(@input.path, encoding: Encoding::CP932) do |csv|
+      assert_equal([["??"]],
+                   csv.to_a)
+    end
+  end
+
+  def test_open_with_invalid_replace_and_replace_string
+    CSV.open(@input.path, "w", encoding: Encoding::CP932, invalid: :replace, replace: "X") do |rows|
+      rows << ["\x82\xa0".force_encoding(Encoding::UTF_8)]
+    end
+    CSV.open(@input.path, encoding: Encoding::CP932) do |csv|
+      assert_equal([["XX"]],
+                   csv.to_a)
+    end
+  end
+
   def test_open_with_undef_replace
     # U+00B7 Middle Dot
     CSV.open(@input.path, "w", encoding: Encoding::CP932, undef: :replace) do |rows|
-- 
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