[ruby-dev:31925] Re: ipaddr

At Sun, 30 Sep 2007 00:27:59 +0900,
Kazuhiro NISHIYAMA wrote:
> 西山和広です。
>
> ipaddrで
>  IPAddr.new("127.0.0.0/8").include?("127.0.0.1")
> がfalseになって悩んだことがあるので、文字列も自動で変換して
> うけつけてくれると嬉しいのではないかと思います。
>
> # 今は
> #  IPAddr.new("127.0.0.0/8").include?(IPAddr.new("127.0.0.1"))
> # じゃないとだめ。

　こうするといいかな。

Index: ipaddr.rb
===================================================================
--- ipaddr.rb	(revision 13588)
+++ ipaddr.rb	(working copy)
@@ -105,14 +105,26 @@
     return s
   end

+  def coerce(other)
+    case other
+    when IPAddr
+      other
+    when String
+      self.class.new(other)
+    else
+      self.class.new(other, @family)
+    end
+  end
+  private coerce
+
   # Returns a new ipaddr built by bitwise AND.
   def &(other)
-    return self.clone.set(@addr & other.to_i)
+    return self.clone.set(@addr & coerce(other).to_i)
   end

   # Returns a new ipaddr built by bitwise OR.
   def |(other)
-    return self.clone.set(@addr | other.to_i)
+    return self.clone.set(@addr | coerce(other).to_i)
   end

   # Returns a new ipaddr built by bitwise right-shift.
@@ -132,10 +144,7 @@

   # Returns true if two ipaddr are equal.
   def ==(other)
-    if other.kind_of?(IPAddr) && @family != other.family
-      return false
-    end
-    return (@addr == other.to_i)
+    return @family == other.family && @addr == coerce(other).to_i
   end

   # Returns a new ipaddr built by masking IP address with the given
@@ -153,6 +162,7 @@
   #   p net1.include?(IPAddr.new("192.168.2.255"))	#=> true
   #   p net1.include?(IPAddr.new("192.168.3.0"))	#=> false
   def include?(other)
+    other = coerce(other)
     if ipv4_mapped?
       if (@mask_addr >> 32) != 0xffffffffffffffffffffffff
 	return false
@@ -165,17 +175,12 @@
       addr = @addr
       family = @family
     end
-    if other.kind_of?(IPAddr)
-      if other.ipv4_mapped?
-	other_addr = (other.to_i & IN4MASK)
-	other_family = Socket::AF_INET
-      else
-	other_addr = other.to_i
-	other_family = other.family
-      end
-    else # Not IPAddr - assume integer in same family as us
-      other_addr   = other.to_i
-      other_family = family
+    if other.ipv4_mapped?
+      other_addr = (other.to_i & IN4MASK)
+      other_family = Socket::AF_INET
+    else
+      other_addr = other.to_i
+      other_family = other.family
     end

     if family != other_family


　ついでに <=> と succ を定義して Comparable にすると、 Range を
作ったりできますね。

> # ライブラリのメンテナの話で思いだした。

　梅本さんにCCしておきます。

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