From 0dc342de848a642ecce8db697b8fecd83a63e117 Mon Sep 17 00:00:00 2001
From: yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 25 Aug 2008 15:02:05 +0000
Subject: added tag v1_9_0_4

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 trunk/lib/ostruct.rb | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 trunk/lib/ostruct.rb

(limited to 'trunk/lib/ostruct.rb')

diff --git a/trunk/lib/ostruct.rb b/trunk/lib/ostruct.rb
new file mode 100644
index 0000000000..f3ed01524b
--- /dev/null
+++ b/trunk/lib/ostruct.rb
@@ -0,0 +1,147 @@
+#
+# = ostruct.rb: OpenStruct implementation
+#
+# Author:: Yukihiro Matsumoto
+# Documentation:: Gavin Sinclair
+#
+# OpenStruct allows the creation of data objects with arbitrary attributes.
+# See OpenStruct for an example.
+#
+
+#
+# OpenStruct allows you to create data objects and set arbitrary attributes.
+# For example:
+#
+#   require 'ostruct' 
+#
+#   record = OpenStruct.new
+#   record.name    = "John Smith"
+#   record.age     = 70
+#   record.pension = 300
+#   
+#   puts record.name     # -> "John Smith"
+#   puts record.address  # -> nil
+#
+# It is like a hash with a different way to access the data.  In fact, it is
+# implemented with a hash, and you can initialize it with one.
+#
+#   hash = { "country" => "Australia", :population => 20_000_000 }
+#   data = OpenStruct.new(hash)
+#
+#   p data        # -> <OpenStruct country="Australia" population=20000000>
+#
+class OpenStruct
+  #
+  # Create a new OpenStruct object.  The optional +hash+, if given, will
+  # generate attributes and values.  For example.
+  #
+  #   require 'ostruct'
+  #   hash = { "country" => "Australia", :population => 20_000_000 }
+  #   data = OpenStruct.new(hash)
+  #
+  #   p data        # -> <OpenStruct country="Australia" population=20000000>
+  #
+  # By default, the resulting OpenStruct object will have no attributes. 
+  #
+  def initialize(hash=nil)
+    @table = {}
+    if hash
+      for k,v in hash
+        @table[k.to_sym] = v
+        new_ostruct_member(k)
+      end
+    end
+  end
+
+  # Duplicate an OpenStruct object members. 
+  def initialize_copy(orig)
+    super
+    @table = @table.dup
+  end
+
+  def marshal_dump
+    @table
+  end
+  def marshal_load(x)
+    @table = x
+    @table.each_key{|key| new_ostruct_member(key)}
+  end
+
+  def new_ostruct_member(name)
+    name = name.to_sym
+    unless self.respond_to?(name)
+      class << self; self; end.class_eval do
+        define_method(name) { @table[name] }
+        define_method(:"#{name}=") { |x| @table[name] = x }
+      end
+    end
+  end
+
+  def method_missing(mid, *args) # :nodoc:
+    mname = mid.id2name
+    len = args.length
+    if mname =~ /=$/
+      if len != 1
+        raise ArgumentError, "wrong number of arguments (#{len} for 1)", caller(1)
+      end
+      if self.frozen?
+        raise TypeError, "can't modify frozen #{self.class}", caller(1)
+      end
+      mname.chop!
+      self.new_ostruct_member(mname)
+      @table[mname.intern] = args[0]
+    elsif len == 0
+      @table[mid]
+    else
+      raise NoMethodError, "undefined method `#{mname}' for #{self}", caller(1)
+    end
+  end
+
+  #
+  # Remove the named field from the object.
+  #
+  def delete_field(name)
+    @table.delete name.to_sym
+  end
+
+  InspectKey = :__inspect_key__ # :nodoc:
+
+  #
+  # Returns a string containing a detailed summary of the keys and values.
+  #
+  def inspect
+    str = "#<#{self.class}"
+
+    Thread.current[InspectKey] ||= []
+    if Thread.current[InspectKey].include?(self) then
+      str << " ..."
+    else
+      first = true
+      for k,v in @table
+        str << "," unless first
+        first = false
+
+        Thread.current[InspectKey] << v
+        begin
+          str << " #{k}=#{v.inspect}"
+        ensure
+          Thread.current[InspectKey].pop
+        end
+      end
+    end
+
+    str << ">"
+  end
+  alias :to_s :inspect
+
+  attr_reader :table # :nodoc:
+  protected :table
+
+  #
+  # Compare this object and +other+ for equality.
+  #
+  def ==(other)
+    return false unless(other.kind_of?(OpenStruct))
+    return @table == other.table
+  end
+end
-- 
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