From 4e365156d130e94a9c7937f498b438183efca954 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 17 Oct 2017 11:18:54 +0900
Subject: Add `Comparable#clamp`; CRuby2.4

---
 mrbgems/mruby-compar-ext/mrbgem.rake      |  5 +++++
 mrbgems/mruby-compar-ext/mrblib/compar.rb | 31 +++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 mrbgems/mruby-compar-ext/mrbgem.rake
 create mode 100644 mrbgems/mruby-compar-ext/mrblib/compar.rb

(limited to 'mrbgems/mruby-compar-ext')

diff --git a/mrbgems/mruby-compar-ext/mrbgem.rake b/mrbgems/mruby-compar-ext/mrbgem.rake
new file mode 100644
index 000000000..dcf584339
--- /dev/null
+++ b/mrbgems/mruby-compar-ext/mrbgem.rake
@@ -0,0 +1,5 @@
+MRuby::Gem::Specification.new('mruby-compar-ext') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+  spec.summary = 'Enumerable module extension'
+end
diff --git a/mrbgems/mruby-compar-ext/mrblib/compar.rb b/mrbgems/mruby-compar-ext/mrblib/compar.rb
new file mode 100644
index 000000000..d66f816ef
--- /dev/null
+++ b/mrbgems/mruby-compar-ext/mrblib/compar.rb
@@ -0,0 +1,31 @@
+module Comparable
+  ##
+  # Returns <i>min</i> if <i>obj</i> <code><=></code> <i>min</i> is less
+  # than zero, <i>max</i> if <i>obj</i> <code><=></code> <i>max</i> is
+  # greater than zero and <i>obj</i> otherwise.
+  #
+  #     12.clamp(0, 100)         #=> 12
+  #     523.clamp(0, 100)        #=> 100
+  #     -3.123.clamp(0, 100)     #=> 0
+  #
+  #     'd'.clamp('a', 'f')      #=> 'd'
+  #     'z'.clamp('a', 'f')      #=> 'f'
+  #
+  def clamp(min, max)
+    if (min <=> max) > 0
+      raise ArgumentError, "min argument must be smaller than max argument"
+    end
+    c = self <=> min
+    if c == 0
+      return self
+    elsif c < 0
+      return min
+    end
+    c = self <=> max
+    if c > 0
+      return max
+    else
+      return self
+    end
+  end
+end
-- 
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