[rubygems/rubygems] Revert multi ruby{,gems} version requirement fix

This reverts commit 20f06d9e178211a3016133852b72d21ac7bb93ad, reversing
changes made to f2b30cb70df8a518bef0e8a64bbceb86234d922d.

https://github.com/rubygems/rubygems/commit/40802bdb18

2 files changed, 13 insertions, 71 deletions

diff --git a/lib/bundler/compact_index_client/cache.rb b/lib/bundler/compact_index_client/cache.rb
index ef8517e8f6..f6105d3bb3 100644
--- a/lib/bundler/compact_index_client/cache.rb
+++ b/lib/bundler/compact_index_client/cache.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require_relative "gem_parser"
-
 module Bundler
   class CompactIndexClient
     class Cache
@@ -94,9 +92,19 @@ module Bundler
         header ? lines[header + 1..-1] : lines
       end
 
-      def parse_gem(line)
-        @gem_parser ||= GemParser.new
-        @gem_parser.parse(line)
+      def parse_gem(string)
+        version_and_platform, rest = string.split(" ", 2)
+        version, platform = version_and_platform.split("-", 2)
+        dependencies, requirements = rest.split("|", 2).map {|s| s.split(",") } if rest
+        dependencies = dependencies ? dependencies.map {|d| parse_dependency(d) } : []
+        requirements = requirements ? requirements.map {|r| parse_dependency(r) } : []
+        [version, platform, dependencies, requirements]
+      end
+
+      def parse_dependency(string)
+        dependency = string.split(":")
+        dependency[-1] = dependency[-1].split("&") if dependency.size > 1
+        dependency
       end
 
       def info_roots
diff --git a/lib/bundler/compact_index_client/gem_parser.rb b/lib/bundler/compact_index_client/gem_parser.rb
deleted file mode 100644
index 117da64ce6..0000000000
--- a/lib/bundler/compact_index_client/gem_parser.rb
+++ /dev/null
@@ -1,66 +0,0 @@
-# frozen_string_literal: true
-
-module Bundler
-  class CompactIndexClient
-    class GemParser
-      def parse(line)
-        version_and_platform, rest = line.split(" ", 2)
-        version, platform = version_and_platform.split("-", 2)
-        dependencies, requirements = rest.split("|", 2) if rest
-        dependencies = dependencies ? parse_dependencies(dependencies) : []
-        requirements = requirements ? parse_requirements(requirements) : []
-        [version, platform, dependencies, requirements]
-      end
-
-    private
-
-      def parse_dependencies(raw_dependencies)
-        raw_dependencies.split(",").map {|d| parse_dependency(d) }
-      end
-
-      def parse_dependency(raw_dependency)
-        dependency = raw_dependency.split(":")
-        dependency[-1] = dependency[-1].split("&") if dependency.size > 1
-        dependency
-      end
-
-      # Parse the following format:
-      #
-      #   line = "checksum:#{checksum}"
-      #   line << ",ruby:#{ruby_version}" if ruby_version && ruby_version != ">= 0"
-      #   line << ",rubygems:#{rubygems_version}" if rubygems_version && rubygems_version != ">= 0"
-      #
-      # See compact_index/gem_version.rb for details.
-      #
-      # We can't use parse_dependencies for requirements because "," in
-      # ruby_version and rubygems_version isn't escaped as "&". For example,
-      # "checksum:XXX,ruby:>=2.2, < 2.7.dev" can't be parsed as expected.
-      def parse_requirements(raw_requirements)
-        requirements = []
-        checksum = raw_requirements.match(/\A(checksum):([^,]+)/)
-        if checksum
-          requirements << [checksum[1], [checksum[2]]]
-          raw_requirements = checksum.post_match
-          if raw_requirements.start_with?(",")
-            raw_requirements = raw_requirements[1..-1]
-          end
-        end
-        rubygems = raw_requirements.match(/(rubygems):(.+)\z/)
-        if rubygems
-          raw_requirements = rubygems.pre_match
-          if raw_requirements.start_with?(",")
-            raw_requirements = raw_requirements[1..-1]
-          end
-        end
-        ruby = raw_requirements.match(/\A(ruby):(.+)\z/)
-        if ruby
-          requirements << [ruby[1], ruby[2].split(/\s*,\s*/)]
-        end
-        if rubygems
-          requirements << [rubygems[1], rubygems[2].split(/\s*,\s*/)]
-        end
-        requirements
-      end
-    end
-  end
-end