1 files changed, 67 insertions, 0 deletions
diff --git a/lib/bundler/ruby_dsl.rb b/lib/bundler/ruby_dsl.rb
new file mode 100644
index 0000000000..5e52f38c8f
--- /dev/null
+++ b/lib/bundler/ruby_dsl.rb
@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+module Bundler
+  module RubyDsl
+    def ruby(*ruby_version)
+      options = ruby_version.pop if ruby_version.last.is_a?(Hash)
+      ruby_version.flatten!
+
+      if options
+        patchlevel = options[:patchlevel]
+        engine = options[:engine]
+        engine_version = options[:engine_version]
+
+        raise GemfileError, "Please define :engine_version" if engine && engine_version.nil?
+        raise GemfileError, "Please define :engine" if engine_version && engine.nil?
+
+        if options[:file]
+          raise GemfileError, "Do not pass version argument when using :file option" unless ruby_version.empty?
+          ruby_version << normalize_ruby_file(options[:file])
+        end
+
+        if engine == "ruby" && engine_version && ruby_version != Array(engine_version)
+          raise GemfileEvalError, "ruby_version must match the :engine_version for MRI"
+        end
+      end
+
+      @ruby_version = RubyVersion.new(ruby_version, patchlevel, engine, engine_version)
+    end
+
+    # Support the various file formats found in .ruby-version files.
+    #
+    #     3.2.2
+    #     ruby-3.2.2
+    #
+    # Also supports .tool-versions files for asdf. Lines not starting with "ruby" are ignored.
+    #
+    #     ruby 2.5.1 # comment is ignored
+    #     ruby   2.5.1# close comment and extra spaces doesn't confuse
+    #
+    # Intentionally does not support `3.2.1@gemset` since rvm recommends using .ruby-gemset instead
+    #
+    # Loads the file relative to the dirname of the Gemfile itself.
+    def normalize_ruby_file(filename)
+      file_content = Bundler.read_file(gemfile.dirname.join(filename))
+      # match "ruby-3.2.2", ruby = "3.2.2", ruby = '3.2.2' or "ruby   3.2.2" capturing version string up to the first space or comment
+      version_match = /^               # Start of line
+                      ruby             # Literal "ruby"
+                      [\s-]*           # Optional whitespace or hyphens (for "ruby-3.2.2" format)
+                      (?:=\s*)?        # Optional equals sign with whitespace (for ruby = "3.2.2" format)
+                      (?:
+                        "([^"]+)"      # Double quoted version
+                        |
+                        '([^']+)'      # Single quoted version
+                        |
+                        ([^\s#"']+)    # Unquoted version
+                      )
+                      /x.match(file_content)
+      if version_match
+        version_match[1] || version_match[2] || version_match[3]
+      else
+        file_content.strip
+      end
+    rescue Errno::ENOENT
+      raise GemfileError, "Could not find version file #{filename}"
+    end
+  end
+end