initial commit

9.2.rb

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+def foo
+  open("/no/file")
+end
+
+def bar
+  foo()
+end
+
+begin
+  bar()
+rescue => ex
+  print ex.message, "\n"
+end
+
+
+

Dir.rb

@@ -0,0 +1,5 @@
+Dir.open("/usr/bin"){ |dir|
+  dir.each{ |name|
+    p name
+  }
+}

FILE_LINE.rb

@@ -0,0 +1 @@
+print("file #{__FILE__}: #{__LINE__}")

M.rb

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+module M
+  def meth
+    puts "meth"
+  end
+end
+
+class C
+  include M
+end
+
+c = C.new
+c.meth

Rakefile

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+require 'rake/testtask'
+lib_dir = File.expand_path('lib')
+test_dir = File.expand_path('test')
+
+# Rakefile
+desc "Cross the bridge."
+task :cross_bridge => [:build_bridge] do
+  puts "I'm crossing the bridge."
+end
+
+desc "Build the bridge."
+task :build_bridge do
+  puts 'Bridge construction is complete.'
+end
+
+task :default => [:cross_bridge]
+
+Rake::TestTask.new('test-file') do |t|
+  t.test_files = ['test/tc_datafile.rb',
+                  'test/tc_datafilewriter.rb',
+                  'test/tc_datafilereader.rb']
+  t.warning = true
+end
+
+Rake::TestTask.new('test-console') do |t|
+  t.test_files = ['test/tc_console.rb',
+                  'test/tc_prettyprinter.rb']
+  t.warning = true
+end
+
+task 'test' => ['test-file', 'test-console']

acc_test.rb

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+class AccTest
+  def pub
+    puts "pub is a public method"
+  end
+
+  private
+  def priv
+    puts "priv is a private method"
+  end
+
+
+end
+
+acc = AccTest.new
+acc.pub
+acc.priv

acc_test_flymake.rb

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+class AccTest
+  def pub
+    puts "pub is a public method"
+  end
+
+  private
+  def priv
+    puts "priv is a private method"
+  end
+
+
+end
+
+acc = AccTest.new
+acc.pub
+acc.priv

accesslog_count.rb

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+# 全体のアクセス数を調べる
+count = 0
+while line = gets()
+  count += 1
+end
+print count,"\n"

accesslog_count2.rb

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+# 全体のアクセス数を調べる(readlines版)
+#lines = readlines
+#print lines.length,"\n"
+print readlines.length,"\n"

accesslog_date.rb

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+# 日ごとのアクセス数を調べる・日付の出力
+while line = gets()
+  datetime = line.chomp.split(/\s/)[3]
+  if %r|\[(\d+)/(\w+)/(\d+)| =~ datetime
+    day, month, year = $1, $2, $3
+    print "#{year}/#{month}/#{day}\n"
+  end
+end

accesslog_date2.rb

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+# 日ごとのアクセス数を調べる・日付の正規化
+MONTH = {'jan' => 1, 'feb' => , 'mar' => 3, 'apr' => 4,
+         'may' => 5, 'jun' => 6, 'jul' => 7, 'aug' => 8,
+         'sep' => 9, 'oct' =>10, 'nov' =>11, 'dec' =>12}
+
+while line = gets()
+  datetime = line.chomp.split(/\s/)[3]
+  if %r|\[(\d+)/(\w+)/(\d+)| =~ datetime
+    day, month, year = $1, MONTH[$2.downcase], $3
+    print "#{year}/#{month}/#{day}\n"
+  end
+end

accesslog_date3.rb

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+# 日ごとのアクセス数を調べる・日付の正規化
+MONTH = {'jan' => 1, 'feb' => 2, 'mar' => 3, 'apr' => 4,
+         'may' => 5, 'jun' => 6, 'jul' => 7, 'aug' => 8,
+         'sep' => 9, 'oct' =>10, 'nov' =>11, 'dec' =>12}
+
+count = Hash.new(0)
+
+while line = gets()
+  datetime = line.chomp.split(/\s/)[3]
+  if %r|\[(\d+)/(\w+)/(\d+)| =~ datetime
+    day, month, year = $1, MONTH[$2.downcase], $3
+    count["#{year}/#{month}/#{day}"] += 1
+  end
+end
+
+
+count.sort{ |a,b| a[0] <=> b[0] }.each{ |key,value|
+  print key, ":", value, "\n"
+}

accesslog_date4.rb

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+# 日ごとのアクセス数を調べる・日付の正規化
+MONTH = {'jan' => 1, 'feb' => 2, 'mar' => 3, 'apr' => 4,
+         'may' => 5, 'jun' => 6, 'jul' => 7, 'aug' => 8,
+         'sep' => 9, 'oct' =>10, 'nov' =>11, 'dec' =>12}
+
+count = Hash.new(0)
+ratio = 0.1
+
+while line = gets()
+  datetime = line.chomp.split(/\s/)[3]
+  if %r|\[(\d+)/(\w+)/(\d+)| =~ datetime
+    day, month, year = $1, MONTH[$2.downcase], $3
+    count["#{year}/#{month}/#{day}"] += 1
+  end
+end
+
+
+count.sort{ |a,b| a[0] <=> b[0] }.each{ |key,value|
+  printf("%10s %5d: %-60s \n",key,value,"#"*(value*ratio))
+}

accesslog_file.rb

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+# 日ごとのアクセス数を調べる・アクセス数の出力
+#FIXME
+MONTH = {'jan' => 1, 'feb' => 2, 'mar' => 3, 'apr' => 4,
+         'may' => 5, 'jun' => 6, 'jul' => 7, 'aug' => 8,
+         'sep' => 9, 'oct' =>10, 'nov' =>11, 'dec' =>12}
+
+pattern = ARGV.shift
+count = Hash.new(0)
+
+while line = gets()
+  column = line.chomp.split
+  path = column[6]
+  #next if path !~ pattern  #ここは書籍とおりにするとエラーになる。
+=begin
+上記のエラー内容は以下の通り。
+Kacintosh% ruby  accesslog_file.rb  /  /opt/local/apache2/logs/access_log
+accesslog_file.rb:13:in `=~': type mismatch: String given (TypeError)
+        From accesslog_file.rb:13
+
+なんで…?
+=end
+ next if path != "#{pattern}"
+=begin
+  これなら大丈夫。正規表現なのがそもそも間違い?
+  いや、でもパターンを引数に取るのだからいいわけか。
+  じゃあ、正規表現で本当にパターンマッチさせるなら…？
+  next if path !~ /#{pattern}/
+  こうなるね。なんだ。これだけか。
+=end
+  datetime = column[3]
+  if %r|\[(\d+)/(\w+)/(\d+)| =~ datetime
+    day, month, year = $1, MONTH[$2.downcase], $3
+    count["#{year}/#{month}/#{day}"] += 1
+  end
+end
+
+count.sort{ |a,b| a[0] <=> b[0] }.each{ |key,value|
+  print key, ":", value, "\n"
+}

ad2heisei.rb

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+# 西暦から平成に変換する
+
+ad = ARGV[0].to_i
+heisei = ad - 1988
+print heisei,"\n"

ad2heisei_flymake.rb

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+# 西暦から平成に変換する
+
+ad = ARGV[0].to_i
+heisei = ad - 1988
+print heisei,"\n"

alias.rb

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+class String
+  alias buffer_size length
+  def length
+    self.split(//).length
+  end
+end
+
+j_string = "日本語の文字列"
+p j_string.buffer_size
+p j_string.length
+

arg_arith.rb

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+num0 = ARGV[0].to_i
+num1 = ARGV[1].to_i
+
+print num0, " + ",num1, " = ", num0 + num1, "\n"
+print num0, " - ",num1, " = ", num0 - num1, "\n"
+print num0, " * ",num1, " = ", num0 * num1, "\n"
+print num0, " / ",num1, " = ", num0 / num1, "\n"

backquote_sample.rb

@@ -0,0 +1,6 @@
+dirlist = `ls`
+dirlist.each do |line|
+  if line =~ /.rb$/i
+    print line
+  end
+end

bit.rb

@@ -0,0 +1,14 @@
+def pb(i)
+  # printfの%bフォーマットを使って
+  # 整数の末尾8ビットを2進数表示する
+  printf("%08b\n", i & 0b11111111)
+end
+
+b = 0b11110000
+pb(b)
+pb(~b)
+pb(b & 0b00010001)
+pb(b | 0b00010001)
+pb(b ^ 0b00010001)
+pb(b >> 3)
+pb(b << 3)

book.rb

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+class Book
+  attr_accessor :title, :author, :genre
+  def initialize(title,author,genre=nil)
+    @title = title
+    @author = author
+    @genre = genre
+  end
+end
+

book_cmp.rb

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+class Book
+  include Comparable
+
+  def <=>(other)
+    t = @genre.to_s <=> other.genre.to_s #ジャンルを比較
+    return t if t != 0
+    return @title <=> other.title
+  end
+
+  attr_accessor :title, :author, :genre
+
+  def initialize(title,author,genre=nil)
+    @title = title
+    @author = author
+    @genre = genre
+  end
+end
+

book_test.rb

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+require 'book_cmp'
+
+ary = []
+ary << Book.new("Software", "Rucker", "SF")
+ary << Book.new("BABEL-17", "Delany", "SF")
+ary << Book.new("Programming Perl", "Wall", "Computer")
+ary << Book.new("Programming Pearls", "Bentley", "Computer")
+
+ary.sort.each{ |book|
+  printf "%-10s %-20s %s\n", book.genre, book.title, book.author
+}
+

booklist.rb

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+require 'book'
+
+class BookList
+  ## 初期化
+  def initialize()
+    @booklist = Array.new
+  end
+
+  ## 新しい本を加える
+  def add(book)
+    @booklist.push(book)
+  end
+
+  ## 本の冊数を返す
+  def length
+    @booklist.length
+  end
+
+  ## n番目に格納されている本を別の本にする
+  def []=(n,book)
+    @booklist[n] = book
+  end
+
+  ## n番目に格納されている本を返す
+  def [](n)
+    @booklist[n]
+  end
+
+  ## 本をリストから削除する
+  def delete(book)
+    @booklist.delete(book)
+  end
+
+  ## イテレータを定義
+  def each
+    @booklist.each{ |book|
+      yield(book)
+    }
+  end
+
+  ## (タイトルだけ取ってくる)イテレータを定義
+  def each_title
+    @booklist.each{ |book|
+      yield(book.title)
+    }
+  end
+  ## タイトルと著者名を返すイテレータを定義
+  def each_title_author
+    @booklist.each{ |book|
+      yield(book.title, book.author)
+    }
+  end
+
+  def find_by_author(author)
+    if block_given?
+    @booklist.each{ |book|
+        if author =~ book.author
+          yield(book)
+        end
+      }
+    else ## ブロックが無い場合
+      result = []
+      @booklist.each{ |book|
+        if author =~ book.author
+          result << book
+        end
+      }
+    end
+  end
+
+
+end

booklist_enum.rb

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+require "booklist"
+
+class BookList
+  include Enumerable
+  def each
+    @booklist.each{ |book|
+      yield(book)
+    }
+  end
+end