[ruby/csv] Don't raise on eof?

GitHub: fix #86

Reported by krororo. Thanks!!!

https://github.com/ruby/csv/commit/5a8d9d9297

lib/csv.rb

@@ -955,6 +955,8 @@ class CSV
       strip: strip,
     }
     @parser = nil
+    @parser_enumerator = nil
+    @eof_error = nil
 
     @writer_options = {
       encoding: @encoding,
@@ -1156,9 +1158,13 @@ class CSV
   end
 
   def eof?
+    return false if @eof_error
     begin
       parser_enumerator.peek
       false
+    rescue MalformedCSVError => error
+      @eof_error = error
+      false
     rescue StopIteration
       true
     end
@@ -1169,6 +1175,7 @@ class CSV
   def rewind
     @parser = nil
     @parser_enumerator = nil
+    @eof_error = nil
     @writer.rewind if @writer
     @io.rewind
   end
@@ -1264,6 +1271,10 @@ class CSV
   # The data source must be open for reading.
   #
   def shift
+    if @eof_error
+      eof_error, @eof_error = @eof_error, nil
+      raise eof_error
+    end
     begin
       parser_enumerator.next
     rescue StopIteration

test/csv/parse/test_invalid.rb

@@ -25,12 +25,15 @@ ggg,hhh,iii
                  csv.shift)
     assert_equal(CSV::Row.new(headers, ["aaa", "bbb", "ccc"]),
                  csv.shift)
+    assert_equal(false, csv.eof?)
     error = assert_raise(CSV::MalformedCSVError) do
       csv.shift
     end
     assert_equal("Illegal quoting in line 3.",
                  error.message)
+    assert_equal(false, csv.eof?)
     assert_equal(CSV::Row.new(headers, ["ggg", "hhh", "iii"]),
                  csv.shift)
+    assert_equal(true, csv.eof?)
   end
 end