1 files changed, 73 insertions, 0 deletions
diff --git a/lib/prism/translation/parser/rubocop.rb b/lib/prism/translation/parser/rubocop.rb
new file mode 100644
index 0000000000..6c9687a5cc
--- /dev/null
+++ b/lib/prism/translation/parser/rubocop.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+# typed: ignore
+
+warn "WARN: Prism is directly supported since RuboCop 1.62. The `prism/translation/parser/rubocop` file is deprecated."
+
+require "parser"
+require "rubocop"
+
+require_relative "../../prism"
+require_relative "../parser"
+
+module Prism
+  module Translation
+    class Parser
+      # This is the special version numbers that should be used in RuboCop
+      # configuration files to trigger using prism.
+
+      # For Ruby 3.3
+      VERSION_3_3 = 80_82_73_83_77.33
+
+      # For Ruby 3.4
+      VERSION_3_4 = 80_82_73_83_77.34
+
+      # This module gets prepended into RuboCop::AST::ProcessedSource.
+      module ProcessedSource
+        # This condition is compatible with rubocop-ast versions up to 1.30.0.
+        if RuboCop::AST::ProcessedSource.instance_method(:parser_class).arity == 1
+          # Redefine parser_class so that we can inject the prism parser into the
+          # list of known parsers.
+          def parser_class(ruby_version)
+            if ruby_version == Prism::Translation::Parser::VERSION_3_3
+              warn "WARN: Setting `TargetRubyVersion: 80_82_73_83_77.33` is deprecated. " \
+                   "Set to `ParserEngine: parser_prism` and `TargetRubyVersion: 3.3` instead."
+              require_relative "../parser33"
+              Prism::Translation::Parser33
+            elsif ruby_version == Prism::Translation::Parser::VERSION_3_4
+              warn "WARN: Setting `TargetRubyVersion: 80_82_73_83_77.34` is deprecated. " \
+                   "Set to `ParserEngine: parser_prism` and `TargetRubyVersion: 3.4` instead."
+              require_relative "../parser34"
+              Prism::Translation::Parser34
+            else
+              super
+            end
+          end
+        else
+          # Redefine parser_class so that we can inject the prism parser into the
+          # list of known parsers.
+          def parser_class(ruby_version, _parser_engine)
+            if ruby_version == Prism::Translation::Parser::VERSION_3_3
+              warn "WARN: Setting `TargetRubyVersion: 80_82_73_83_77.33` is deprecated. " \
+                   "Set to `ParserEngine: parser_prism` and `TargetRubyVersion: 3.3` instead."
+              require_relative "../parser33"
+              Prism::Translation::Parser33
+            elsif ruby_version == Prism::Translation::Parser::VERSION_3_4
+              warn "WARN: Setting `TargetRubyVersion: 80_82_73_83_77.34` is deprecated. " \
+                   "Set to `ParserEngine: parser_prism` and `TargetRubyVersion: 3.4` instead."
+              require_relative "../parser34"
+              Prism::Translation::Parser34
+            else
+              super
+            end
+          end
+        end
+      end
+    end
+  end
+end
+
+# :stopdoc:
+RuboCop::AST::ProcessedSource.prepend(Prism::Translation::Parser::ProcessedSource)
+known_rubies = RuboCop::TargetRuby.const_get(:KNOWN_RUBIES)
+RuboCop::TargetRuby.send(:remove_const, :KNOWN_RUBIES)
+RuboCop::TargetRuby::KNOWN_RUBIES = [*known_rubies, Prism::Translation::Parser::VERSION_3_3].freeze