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nghttp2/third-party/mruby/mrbgems/mruby-compar-ext/mrblib/compar.rb

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+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