+ from

Author: shikhalev

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    is-enum (0.8.2)
+    is-enum (0.8.4)
 
 GEM
   remote: https://rubygems.org/
@@ -46,7 +46,7 @@ DEPENDENCIES
 CHECKSUMS
   diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
   docile (1.4.1) sha256=96159be799bfa73cdb721b840e9802126e4e03dfc26863db73647204c727f21e
-  is-enum (0.8.2)
+  is-enum (0.8.4)
   rake (13.3.1) sha256=8c9e89d09f66a26a01264e7e3480ec0607f0c497a861ef16063604b1b08eb19c
   redcarpet (3.6.1) sha256=d444910e6aa55480c6bcdc0cdb057626e8a32c054c29e793fa642ba2f155f445
   rspec (3.13.2) sha256=206284a08ad798e61f86d7ca3e376718d52c0bc944626b2349266f239f820587

is-enum.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification::new do |s|
   s.name = "is-enum"
-  s.version = "0.8.2"
+  s.version = "0.8.4"
   s.summary = "Enum types for Ruby"
   s.description = "Enum types for Ruby."
   s.authors = ["Ivan Shikhalev"]

lib/is-enum.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'set'
+
 module IS; end
 
 class IS::Enum
@@ -46,6 +48,23 @@ def of name
       return val
     end
 
+    def from value
+      case value
+      when nil
+        nil
+      when self
+        value
+      when Range
+        Range::new from(value.begin), from(value.end), value.exclude_end?
+      when Set
+        Set[*value.map { |v| from(v) }]
+      when Enumerable
+        value.map { |v| from(v) }
+      else
+        raise ArgumentError, "Invalid value of #{ self }: #{ value.inspect }", caller_locations
+      end
+    end
+
     def each
       return to_enum(__method__) unless block_given?
       @values.values.sort_by { |v| v.order_no }.each { |v| yield v }