* Update implementation & spec to be 3.0 compatible

.github/workflows/code_style_checks.yaml

@@ -22,7 +22,7 @@ jobs:
         os:
           - ubuntu
         ruby:
-          - "2.7"
+          - "3.0"
     runs-on: ${{ matrix.os }}-latest
     steps:
       - name: Checkout

.github/workflows/tests.yaml

@@ -22,17 +22,11 @@ jobs:
         os:
           - ubuntu
         ruby:
-          - "2.1"
-          - "2.2"
-          - "2.3"
-          - "2.4"
-          - "2.5"
-          - "2.6"
-          - "2.7"
+          - "3.0"
         test_command: ["bundle exec rspec && bundle exec cucumber"]
         include:
           - os: ubuntu
-            ruby: "2.4.2"
+            ruby: "3.0"
             test_command: "bundle exec rspec"
     runs-on: ${{ matrix.os }}-latest
     steps:

.rubocop.yml

@@ -1,12 +1,17 @@
 inherit_from: .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 1.9
+  TargetRubyVersion: 3.0
   DisplayCopNames: true
+  NewCops: disable
   Exclude:
+    - "benchmarks/**/*"
     - "tmp/**/*"
     - "vendor/**/*"
+    - "script/**/*.rb"
+    - "spec/fixtures/*.rb"
     - "spec/ruby_version_specific/*.rb"
+    - "spec/*.rb"
 
 # forces method defs to have params in parens
 Style/MethodDefParentheses:
@@ -38,7 +43,7 @@ Lint/UnusedMethodArgument:
   Enabled: false
 
 # changes x ** 2 to x**2
-Style/SpaceAroundOperators:
+Layout/SpaceAroundOperators:
   Enabled: false
 
 # doesn't allow vars starting with _
@@ -56,7 +61,7 @@ Style/Documentation:
 
 # enforces line length of 80
 # TODO enable
-Metrics/LineLength:
+Layout/LineLength:
   Enabled: false
 
 # triggered by Contract ({ :name => String, :age => Fixnum }) => nil
@@ -101,7 +106,7 @@ Lint/DuplicateMethods:
 Style/TrivialAccessors:
   Enabled: false
 
-Style/MultilineOperationIndentation:
+Layout/MultilineOperationIndentation:
   EnforcedStyle: indented
 
 # Asks you to use %w{array of words} if possible.
@@ -111,12 +116,12 @@ Style/WordArray:
 
 # conflicts with contracts
 # we define contracts like `Baz = 1`
-Style/ConstantName:
+Naming/ConstantName:
   Enabled: false
 
 # `Contract` violates this, otherwise a good cop (enforces snake_case method names)
 # TODO possible to get this enabled but ignore `Contract`?
-Style/MethodName:
+Naming/MethodName:
   Enabled: false
 
 # checks for !!
@@ -129,9 +134,30 @@ Metrics/ParameterLists:
   Enabled: false
 
 # Checks that braces used for hash literals have or don't have surrounding space depending on configuration.
-Style/SpaceInsideHashLiteralBraces:
+Layout/SpaceInsideHashLiteralBraces:
   Enabled: false
 
 # TODO enable
 Style/SpecialGlobalVars:
   Enabled: false
+
+Style/IfUnlessModifier:
+  Enabled: false
+
+Naming/MemoizedInstanceVariableName:
+  Enabled: false
+
+Layout/FirstHashElementIndentation:
+  EnforcedStyle: consistent
+
+Layout/HashAlignment:
+  EnforcedColonStyle: table
+
+Style/TrailingCommaInHashLiteral:
+  EnforcedStyleForMultiline: consistent_comma
+
+Style/TrailingCommaInArrayLiteral:
+  EnforcedStyleForMultiline: consistent_comma
+
+Style/TrailingCommaInArguments:
+  EnforcedStyleForMultiline: consistent_comma

.rubocop_todo.yml

@@ -6,6 +6,9 @@
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
+require:
+  - rubocop-performance
+
 # Offense count: 2
 Lint/NonLocalExitFromIterator:
   Exclude:
@@ -32,14 +35,14 @@ Style/Alias:
 # Offense count: 1
 # Cop supports --auto-correct.
 # Configuration parameters: AllowAdjacentOneLineDefs.
-Style/EmptyLineBetweenDefs:
+Layout/EmptyLineBetweenDefs:
   Exclude:
     - 'benchmarks/wrap_test.rb'
 
 # Offense count: 1
 # Cop supports --auto-correct.
 # Configuration parameters: AllowForAlignment, ForceEqualSignAlignment.
-Style/ExtraSpacing:
+Layout/ExtraSpacing:
   Exclude:
     - 'spec/builtin_contracts_spec.rb'
 
@@ -58,7 +61,7 @@ Style/IfInsideElse:
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle, SupportedStyles.
 # SupportedStyles: symmetrical, new_line, same_line
-Style/MultilineHashBraceLayout:
+Layout/MultilineHashBraceLayout:
   Exclude:
     - 'spec/contracts_spec.rb'
     - 'spec/fixtures/fixtures.rb'
@@ -130,6 +133,6 @@ Style/TrailingUnderscoreVariable:
 
 # Offense count: 1
 # Cop supports --auto-correct.
-Style/UnneededInterpolation:
+Style/RedundantInterpolation:
   Exclude:
     - 'lib/contracts/formatters.rb'

Gemfile

@@ -1,17 +1,21 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gemspec
 
 group :test do
-  gem "rspec"
   gem "aruba"
   gem "cucumber", "~> 1.3.20"
-  gem "rubocop", "~> 0.41.2" if RUBY_VERSION >= "2"
+  gem "rspec"
+
+  gem "rubocop", ">= 1.0.0"
+  gem "rubocop-performance", ">= 1.0.0"
 end
 
 group :development do
-  gem "relish"
   gem "method_profiler"
-  gem "ruby-prof"
   gem "rake"
+  gem "relish"
+  gem "ruby-prof"
 end

Rakefile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 task :default => [:spec]
 
 task :add_tag do

contracts.gemspec

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require File.expand_path(File.join(__FILE__, "../lib/contracts/version"))
 
 Gem::Specification.new do |s|
@@ -10,6 +12,7 @@ Gem::Specification.new do |s|
   s.files       = `git ls-files`.split("\n")
   s.homepage    = "https://github.com/egonSchiele/contracts.ruby"
   s.license     = "BSD-2-Clause"
+  s.required_ruby_version = [">= 3.0", "< 4"]
   s.post_install_message = "
     0.16.x will be the supporting Ruby 2.x and be feature frozen (only fixes will be released)
     For Ruby 3.x use 0.17.x or later (might not be released yet)

features/support/env.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "aruba/cucumber"
 require "aruba/jruby" if RUBY_PLATFORM == "java"
 

lib/contracts.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "contracts/attrs"
 require "contracts/builtin_contracts"
 require "contracts/decorators"
@@ -51,7 +53,9 @@ class Contract < Contracts::Decorator
   end
 
   attr_reader :args_contracts, :ret_contract, :klass, :method
+
   def initialize(klass, method, *contracts)
+    super(klass, method)
     unless contracts.last.is_a?(Hash)
       unless contracts.one?
         fail %{
@@ -93,17 +97,17 @@ def initialize(klass, method, *contracts)
     last_contract = args_contracts.last
     penultimate_contract = args_contracts[-2]
     @has_options_contract = if @has_proc_contract
-                              penultimate_contract.is_a?(Hash) || penultimate_contract.is_a?(Contracts::Builtin::KeywordArgs)
+                              penultimate_contract.is_a?(Contracts::Builtin::KeywordArgs)
                             else
-                              last_contract.is_a?(Hash) || last_contract.is_a?(Contracts::Builtin::KeywordArgs)
+                              last_contract.is_a?(Contracts::Builtin::KeywordArgs)
                             end
     # ===
 
     @klass, @method = klass, method
   end
 
-  def pretty_contract c
-    c.is_a?(Class) ? c.name : c.class.name
+  def pretty_contract contract
+    contract.is_a?(Class) ? contract.name : contract.class.name
   end
 
   def to_s
@@ -130,15 +134,15 @@ def self.failure_msg(data)
     expected_prefix = "Expected: "
     expected_value = Contracts::Support.indent_string(
       Contracts::Formatters::Expected.new(data[:contract]).contract.pretty_inspect,
-      expected_prefix.length
+      expected_prefix.length,
     ).strip
-    expected_line = expected_prefix + expected_value + ","
+    expected_line = "#{expected_prefix}#{expected_value},"
 
     # Actual
     actual_prefix = "Actual: "
     actual_value = Contracts::Support.indent_string(
       data[:arg].pretty_inspect,
-      actual_prefix.length
+      actual_prefix.length,
     ).strip
     actual_line = actual_prefix + actual_value
 
@@ -157,16 +161,19 @@ def self.failure_msg(data)
     position_value = Contracts::Support.method_position(data[:method])
     position_line = position_prefix + position_value
 
-    header +
-      "\n" +
+    [
+      header,
       Contracts::Support.indent_string(
-        [expected_line,
-         actual_line,
-         value_line,
-         contract_line,
-         position_line].join("\n"),
-        indent_amount
-      )
+        [
+          expected_line,
+          actual_line,
+          value_line,
+          contract_line,
+          position_line,
+        ].join("\n"),
+        indent_amount,
+      ),
+    ].join("\n")
   end
 
   # Callback for when a contract fails. By default it raises
@@ -182,7 +189,7 @@ def self.failure_msg(data)
   #     puts failure_msg(data)
   #     exit
   #   end
-  def self.failure_callback(data, use_pattern_matching = true)
+  def self.failure_callback(data, use_pattern_matching: true)
     if data[:contracts].pattern_match? && use_pattern_matching
       return DEFAULT_FAILURE_CALLBACK.call(data)
     end
@@ -242,19 +249,21 @@ def call(*args, &blk)
   # returns true if it appended nil
   def maybe_append_block! args, blk
     return false unless @has_proc_contract && !blk &&
-        (@args_contract_index || args.size < args_contracts.size)
+      (@args_contract_index || args.size < args_contracts.size)
+
     args << nil
     true
   end
 
   # Same thing for when we have named params but didn't pass any in.
   # returns true if it appended nil
-  def maybe_append_options! args, blk
+  def maybe_append_options! args, kargs, blk
     return false unless @has_options_contract
-    if @has_proc_contract && (args_contracts[-2].is_a?(Hash) || args_contracts[-2].is_a?(Contracts::Builtin::KeywordArgs)) && !args[-2].is_a?(Hash)
-      args.insert(-2, {})
-    elsif (args_contracts[-1].is_a?(Hash) || args_contracts[-1].is_a?(Contracts::Builtin::KeywordArgs)) && !args[-1].is_a?(Hash)
-      args << {}
+
+    if @has_proc_contract && args_contracts[-2].is_a?(Contracts::Builtin::KeywordArgs)
+      args.insert(-2, kargs)
+    elsif args_contracts[-1].is_a?(Contracts::Builtin::KeywordArgs)
+      args << kargs
     end
     true
   end

lib/contracts/attrs.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Contracts
   module Attrs
     def attr_reader_with_contract(*names, contract)