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bin/gems/zeitwerk-2.7.2/lib/zeitwerk/cref.rb

@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+# This private class encapsulates pairs (mod, cname).
+#
+# Objects represent the constant cname in the class or module object mod, and
+# have API to manage them. Examples:
+#
+#   cref.path
+#   cref.set(value)
+#   cref.get
+#
+# The constant may or may not exist in mod.
+class Zeitwerk::Cref
+  require_relative "cref/map"
+
+  include Zeitwerk::RealModName
+
+  # @sig Module
+  attr_reader :mod
+
+  # @sig Symbol
+  attr_reader :cname
+
+  # The type of the first argument is Module because Class < Module, class
+  # objects are also valid.
+  #
+  # @sig (Module, Symbol) -> void
+  def initialize(mod, cname)
+    @mod   = mod
+    @cname = cname
+    @path  = nil
+  end
+
+  # @sig () -> String
+  def path
+    @path ||= Object.equal?(@mod) ? @cname.name : "#{real_mod_name(@mod)}::#{@cname.name}".freeze
+  end
+  alias to_s path
+
+  # @sig () -> String?
+  def autoload?
+    @mod.autoload?(@cname, false)
+  end
+
+  # @sig (String) -> bool
+  def autoload(abspath)
+    @mod.autoload(@cname, abspath)
+  end
+
+  # @sig () -> bool
+  def defined?
+    @mod.const_defined?(@cname, false)
+  end
+
+  # @sig (top) -> top
+  def set(value)
+    @mod.const_set(@cname, value)
+  end
+
+  # @raise [NameError]
+  # @sig () -> top
+  def get
+    @mod.const_get(@cname, false)
+  end
+
+  # @raise [NameError]
+  # @sig () -> void
+  def remove
+    @mod.__send__(:remove_const, @cname)
+  end
+end