[ruby-list:2809] jcode.rb

わたなべです.

SJIS で

for i in 'ア' .. 'ン'
  print i
end
print "\n"

なんてことすると「ミ」と「ム」の間になぞの文字が出てくるのが
厭でちょっといじってみました.

--- ../ruby-1.0-970411/lib/jcode.rb	Sat Feb 15 00:50:47 1997
+++ lib/jcode.rb	Mon Apr 14 09:56:46 1997
@@ -10,10 +10,21 @@
   alias original_succ succ
   private :original_succ
 
+  def mbchar?(c)
+    if $KCODE =~ /^s/i
+      c =~ /[\x81-\x9f\xe0-\xef][\x40-\x7e\x80-\xfc]/n
+    elsif $KCODE =~ /^e/i
+      c =~ /[\xa1-\xfe][\xa1-\xfe]/n
+    else
+      FALSE
+    end
+  end
+
   def succ
     if self[-2] && self[-2] & 0x80 != 0
       s = self.dup
       s[-1] += 1
+      s[-1] += 1 if !mbchar?(s)
       return s
     else
       original_succ
@@ -27,8 +38,11 @@
     tail = self[-2..-1]
     if tail.length == 2 and tail  =~ /^.$/ then
       if self[0..-2] == to[0..-2]
+	first = self[-2].chr
 	for c in self[-1] .. to[-1]
-	  yield self[0..-2]+c.chr
+	  if mbchar?(first+c.chr)
+	    yield self[0..-2]+c.chr
+	  end
 	end
       end
     else