Fix offenses in sheet protection

- Lint/AmbiguousOperatorPrecedence
- Style/PerlBackrefs
- Style/StringChars
- Style/UnpackFirst

3 files changed, 6 insertions, 22 deletions

diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 29c93858..ac807d56 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -31,7 +31,6 @@ Layout/HashAlignment:
 # This cop supports safe autocorrection (--autocorrect).
 Lint/AmbiguousOperatorPrecedence:
   Exclude:
-    - 'lib/axlsx/workbook/worksheet/sheet_protection.rb'
     - 'lib/axlsx/workbook/worksheet/worksheet.rb'
 
 # This cop supports unsafe autocorrection (--autocorrect-all).
@@ -263,11 +262,6 @@ Style/PercentLiteralDelimiters:
     - 'test/workbook/worksheet/tc_table_style_info.rb'
 
 # This cop supports safe autocorrection (--autocorrect).
-Style/PerlBackrefs:
-  Exclude:
-    - 'test/workbook/worksheet/tc_sheet_protection.rb'
-
-# This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle.
 # SupportedStyles: same_as_string_literals, single_quotes, double_quotes
 Style/QuotedSymbols:
@@ -299,11 +293,6 @@ Style/SlicingWithRange:
     - 'lib/axlsx/workbook/worksheet/pivot_table.rb'
     - 'lib/axlsx/workbook/worksheet/worksheet.rb'
 
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Style/StringChars:
-  Exclude:
-    - 'lib/axlsx/workbook/worksheet/sheet_protection.rb'
-
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, ConsistentQuotesInMultiline.
 # SupportedStyles: single_quotes, double_quotes
@@ -333,11 +322,6 @@ Style/TrivialAccessors:
     - 'lib/axlsx/workbook/worksheet/worksheet_hyperlink.rb'
 
 # This cop supports safe autocorrection (--autocorrect).
-Style/UnpackFirst:
-  Exclude:
-    - 'lib/axlsx/workbook/worksheet/sheet_protection.rb'
-
-# This cop supports safe autocorrection (--autocorrect).
 Style/WhileUntilModifier:
   Exclude:
     - 'lib/axlsx/workbook/worksheet/color_scale.rb'
diff --git a/lib/axlsx/workbook/worksheet/sheet_protection.rb b/lib/axlsx/workbook/worksheet/sheet_protection.rb
index ce39b1b4..abf5e452 100644
--- a/lib/axlsx/workbook/worksheet/sheet_protection.rb
+++ b/lib/axlsx/workbook/worksheet/sheet_protection.rb
@@ -87,25 +87,25 @@ module Axlsx
       encoded_password = encode_password(password)
 
       password_as_hex = [encoded_password].pack("v")
-      password_as_string = password_as_hex.unpack("H*").first.upcase
+      password_as_string = password_as_hex.unpack1("H*").upcase
 
       password_as_string[2..3] + password_as_string[0..1]
     end
 
     # Encodes a given password
     # Based on the algorithm provided by Daniel Rentz of OpenOffice.
-    # http://www.openoffice.org/sc/excelfileformat.pdf, Revision 1.42, page 115 (21.05.2012)
+    # https://www.openoffice.org/sc/excelfileformat.pdf, Revision 1.42, page 115 (21.05.2012)
     # @return [String]
     def encode_password(password)
       i = 0
-      chars = password.split("")
+      chars = password.chars
       count = chars.size
 
       chars.collect! do |char|
         i += 1
-        char     = char.unpack('c')[0] << i # ord << i
+        char     = char.unpack1('c') << i # ord << i
         low_15   = char & 0x7fff
-        high_15  = char & 0x7fff << 15
+        high_15  = char & (0x7fff << 15)
         high_15  = high_15 >> 15
         low_15 | high_15
       end
diff --git a/test/workbook/worksheet/tc_sheet_protection.rb b/test/workbook/worksheet/tc_sheet_protection.rb
index ebfff4b6..11a43ac8 100644
--- a/test/workbook/worksheet/tc_sheet_protection.rb
+++ b/test/workbook/worksheet/tc_sheet_protection.rb
@@ -57,7 +57,7 @@ class TestSheetProtection < Test::Unit::TestCase
     doc = Nokogiri::XML(@sp.to_xml_string)
 
     @options.each do |key, value|
-      assert(doc.xpath("//sheetProtection[@#{key.to_s.gsub(/_(.)/) { $1.upcase }}='#{value}']"))
+      assert(doc.xpath("//sheetProtection[@#{key.to_s.gsub(/_(.)/) { ::Regexp.last_match(1).upcase }}='#{value}']"))
     end
   end
 end