From be870b780d802001b399a2cc2f143df69529dcc8 Mon Sep 17 00:00:00 2001
From: Kyrylo Silin <silin@kyrylo.org>
Date: Tue, 17 Mar 2020 18:02:58 +0800
Subject: exceptions: check if $SAFE is supported by Ruby

Fixes #2099 ($SAFE will become a normal global variable in Ruby 3.0)

MRI < 2.7 supports `$SAFE` variable, which is associated with
taint/untaint methods. All of that is deprecated in 2.7 with a lot of
warning messages generated, and no other effect.

None of this is supported on other Ruby platforms.

Related Ruby ticket:
https://bugs.ruby-lang.org/issues/8468
---
 lib/pry/exceptions.rb | 6 +++++-
 lib/pry/pry_class.rb  | 7 +++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/pry/exceptions.rb b/lib/pry/exceptions.rb
index eac1c009..ee31e6c4 100644
--- a/lib/pry/exceptions.rb
+++ b/lib/pry/exceptions.rb
@@ -27,7 +27,11 @@ class Pry
   # Catches SecurityErrors if $SAFE is set
   module TooSafeException
     def self.===(exception)
-      $SAFE > 0 && exception.is_a?(SecurityError)
+      if Pry::HAS_SAFE_LEVEL
+        $SAFE > 0 && exception.is_a?(SecurityError)
+      else
+        exception.is_a?(SecurityError)
+      end
     end
   end
 
diff --git a/lib/pry/pry_class.rb b/lib/pry/pry_class.rb
index 414c6a5a..80dda807 100644
--- a/lib/pry/pry_class.rb
+++ b/lib/pry/pry_class.rb
@@ -6,6 +6,13 @@ require 'pathname'
 class Pry
   LOCAL_RC_FILE = "./.pryrc".freeze
 
+  # @return [Boolean] true if this Ruby supports safe levels and tainting,
+  #  to guard against using deprecated or unsupported features
+  HAS_SAFE_LEVEL = (
+    RUBY_ENGINE == 'ruby' &&
+    Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.7')
+  )
+
   class << self
     extend Pry::Forwardable
     attr_accessor :custom_completions
-- 
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