1 files changed, 66 insertions, 0 deletions
diff --git a/lib/bundler/compact_index_client/gem_parser.rb b/lib/bundler/compact_index_client/gem_parser.rb
new file mode 100644
index 0000000000..117da64ce6
--- /dev/null
+++ b/lib/bundler/compact_index_client/gem_parser.rb
@@ -0,0 +1,66 @@
+# 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