ruby-list

はじめまして。
土岐といいます。

ruby で UNIX の look コマンドを作りたくて、perl のライブラリに入ってる 
look.pl を ruby に翻訳したんですが、IO クラスの内側での pos= メソッド
の挙動がなんか変です。

class IO
  def look(key, dict = false, fold = $=)
    s = stat
    size = s.size
    blksize = s.blksize

    raise "zero size exception!" unless size
    blksize = 8192 unless blksize

    key = key.gsub(/[^\w\s]/, "") if dict
    key = key.downcase if fold
    min = 0
    max = size / blksize
    while (max - min > 1)
      mid = (max + min) / 2
      pos=(mid * blksize)
      $stdout.print "tell:#{tell}, pos:#{pos}\n" # debug
      gets if mid		# probably a partial line
      l = gets
      l.chomp!
      l.gsub!(/[^\w\s]/, "") if dict
      l.downcase! if fold
      if (l < key) then
	min = mid
      else
	max = mid
      end
    end

    min *= blksize
    pos=(min)
    $stdout.print "tell:#{tell}, pos:#{pos}\n" # deubg
    gets if min
    while (l = gets)
      l.chomp!
      l.gsub!(/[^\w\s]/, "") if dict
      l.downcase! if fold
      break if (l >= key)
      min = pos
    end
    pos=(min)
    $stdout.print "tell:#{tell}, pos:#{pos}\n" # debug
  end
end

こういうメソッドを IO クラスに追加したんですが、
試しに /usr/share/dict/words を "ruby" で検索すると
デバッグ用の出力はこうなります。

tell:0, pos:1236992
tell:4, pos:1859584
tell:11, pos:2170880
tell:21, pos:2326528
tell:35, pos:2400256
tell:50, pos:2441216
tell:68, pos:2457600
tell:87, pos:2465792
tell:95, pos:2473984
tell:107, pos:2473984
tell:1811096, pos:2473984

ちなみに、ruby のバージョンは 1.1c7(98/11/09) [i386-freebsd2.2.6] です。
メソッド定義の中で pos= を self.pos= or seek(offset, 0) に変更すると

tell:1236992, pos:1236992
tell:1859584, pos:1859584
tell:1548288, pos:1548288
tell:1703936, pos:1703936
tell:1777664, pos:1777664
tell:1818624, pos:1818624
tell:1794048, pos:1794048
tell:1802240, pos:1802240
tell:1810432, pos:1810432
tell:1810432, pos:1810432
tell:1811091, pos:1811091

となり正常に動作します。pos= はデフォルトで self を見に行くはずだから
わざわざ明示的に書く必要はないはずだし、そもそも self を指定しないとき
の動作が意味不明です。pos= メソッドは Maling List のアーカイブで検索し
ても ruby の附属ライブラリを grep しても出て来なかったので、あまり使
われてないみたいですが、これってひょっとしてバグですか？

----------------------------------------------------------------------
土岐 仁謙
神戸大学自然科学研究科前期博士課程物理学専攻高エネルギー物理学講座
Yoshinori Toki
HEP, Department of Physics, Faculty of Science, Kobe University
TEL:	+81 (78) 803 0543
FAX:    +81 (78) 803 0724
URL:	http://www.phys.sci.kobe-u.ac.jp/~toki/toki.html
Email:	toki@hep.phys.sci.kobe-u.ac.jp (public)
Email:  toki@freedom.ne.jp (private)
PGP fingerprint = D0 A8 90 AB 73 F8 34 FE  CE CA DB BF 01 30 C0 35

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[#10720] Re: 11/10 tokyo offline meeting — greentea@...2.so-net.ne.jp (Tomoyuki Kosimizu)

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[#10727] Re: 11/10 tokyo offline meeting — SHIROYAMA Takayuki <psi@...>

[#10747] ruby 1.1c7 released — matz@... (Yukihiro Matsumoto)

[#10752] Re: case with Class — toyofuku@...

[#10753] Re: ruby:struct -> ext module -> ruby — toyofuku@...

[#10759] COMPUMODA — greenmanalishi@...

[#10767] HttpTunnelServer shoud be run as root ? — Kikutani Makoto <kikutani@...>

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[#10785] Re: case with Class — toyofuku@...

[#10788] 0th(?) Ruby Conference Report — greentea@...2.so-net.ne.jp (Tomoyuki Kosimizu)

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[#10836] 文字の型は何？ — "Kozuka Masahiro" <kozuka@...>

[#10847] RE: 文字の型は何？ — "Kozuka Masahiro" <kozuka@...>

[#10848] IO#pos= — Yoshinori Toki <toki@...>

[#10850] patch for mswin32 — 助田 雅紀 <masaki.suketa@...>

[#10856] win32 OLE — 助田 雅紀 <masaki.suketa@...>

[#10868] Re: case with Class — Toyofuku <toyofuku@...>

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[#10877] Re: REBOL — "MAEDA Shugo" <shugo@...>

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[#10899] Re: win32 OLE — 助田 雅紀 <masaki.suketa@...>

[#10900] Re: win32 OLE — 助田 雅紀 <masaki.suketa@...>

[#10902] Re: win32 OLE — 助田 雅紀 <masaki.suketa@...>

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[#10953] Re: World Wide grep — toyofuku@...

[#10958] Re: 0th(?) Ruby Conference Report — greentea@...2.so-net.ne.jp (Tomoyuki Kosimizu)

[#10965] Re: win32 OLE — 助田 雅紀 <masaki.suketa@...>

[#10967] Re: win32 OLE — 助田 雅紀 <masaki.suketa@...>

[#10969] Re: win32 OLE — 助田 雅紀 <masaki.suketa@...>

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[#10979] Ruby/Forms (ver 0.5) — ttate@...

[#10984] Re: gets のクラス — 助田 雅紀 <masaki.suketa@...>

[#10992] Re: case with Class — "豊福" <toyofuku@...>

[#11001] 文字列の抽出について — "Hirotaka Ishida" <h-ishida@...>

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[#11026] Re: make ruby on WinNT with VC++6.0 — Koji Oda <oda@...1.qnes.nec.co.jp>

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[#10856] win32 OLE — 助田　雅紀 <masaki.suketa@...>

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[#10899] Re: win32 OLE — 助田　雅紀 <masaki.suketa@...>

[#10900] Re: win32 OLE — 助田　雅紀 <masaki.suketa@...>

[#10902] Re: win32 OLE — 助田　雅紀 <masaki.suketa@...>

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[#10965] Re: win32 OLE — 助田　雅紀 <masaki.suketa@...>

[#10967] Re: win32 OLE — 助田　雅紀 <masaki.suketa@...>

[#10969] Re: win32 OLE — 助田　雅紀 <masaki.suketa@...>

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