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* lib/ostruct.rb: Improve documentation. Patch by Franklin Webber.

[Ruby 1.9 - Bug #4761]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31706 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
drbrain 2011-05-22 23:46:08 +00:00
parent 317e2a5021
commit c651520c13
2 changed files with 118 additions and 18 deletions

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@ -1,3 +1,8 @@
Mon May 23 08:45:55 2011 Eric Hodel <drbrain@segment7.net>
* lib/ostruct.rb: Improve documentation. Patch by Franklin Webber.
[Ruby 1.9 - Bug #4761]
Mon May 23 08:35:24 2011 Eric Hodel <drbrain@segment7.net>
* hash.c: Improve documentation of Hash#key. Patch by Utkarsh

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@ -9,31 +9,79 @@
#
#
# OpenStruct allows you to create data objects and set arbitrary attributes.
# For example:
# An OpenStruct is a data structure, similar to a Hash, that allows the
# definition of arbitrary attributes with their accompanying values. This is
# accomplished by using Ruby's metaporgramming to define methods on the class
# itself.
#
# == Examples:
#
# require 'ostruct'
#
# record = OpenStruct.new
# record.name = "John Smith"
# record.age = 70
# record.pension = 300
# person = OpenStruct.new
# person.name = "John Smith"
# person.age = 70
# person.pension = 300
#
# puts record.name # -> "John Smith"
# puts record.address # -> nil
# puts person.name # -> "John Smith"
# puts person.age # -> 70
# puts person.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.
# An OpenStruct employs a Hash internally to store the methods and values and
# can even be initialized with one:
#
# hash = { "country" => "Australia", :population => 20_000_000 }
# data = OpenStruct.new(hash)
# country_data = { :country => "Australia", :population => 20_000_000 }
# australia = OpenStruct.new(country_data)
# p australia # -> <OpenStruct country="Australia" population=20000000>
#
# p data # -> <OpenStruct country="Australia" population=20000000>
# You may also define the hash in the initialization call:
#
# australia = OpenStruct.new(:country => "Australia", :population => 20_000_000)
# p australia # -> <OpenStruct country="Australia" population=20000000>
#
# Hash keys with spaces or characters that would normally not be able to use for
# method calls (e.g. ()[]*) will not be immediately available on the
# OpenStruct object as a method for retrieval or assignment, but can be still be
# reached through the Object#send method.
#
# measurements = OpenStruct.new("length (in inches)" => 24)
# measurements.send("length (in inches)") # -> 24
#
# data_point = OpenStruct.new(:queued? => true)
# data_point.queued? # -> true
# data_point.send("queued?=",false)
# data_point.queued? # -> false
#
# Removing the presence of a method requires the execution the delete_field
# method as setting the property value to +nil+ will not remove the method.
#
# first_pet = OpenStruct.new(:name => 'Rowdy', :owner => 'John Smith')
# first_pet.owner = nil
# second_pet = OpenStruct.new(:name => 'Rowdy')
#
# first_pet == second_pet # -> false
#
# first_pet.delete_field(:owner)
# first_pet == second_pet # -> true
#
#
# == Implementation:
#
# An OpenStruct utilizes Ruby's method lookup structure to and find and define
# the necessary methods for properties. This is accomplished through the method
# method_missing and define_method.
#
# This should be a consideration if there is a concern about the performance of
# the objects that are created. As there is much more overhead in the setting
# of these properties compard to utilizing a Hash or a Struct.
#
class OpenStruct
#
# Create a new OpenStruct object. The optional +hash+, if given, will
# generate attributes and values. For example.
# Creates a new OpenStruct object. By default, the resulting OpenStruct
# object will have no attributes.
#
# The optional +hash+, if given, will generate attributes and values.
# For example:
#
# require 'ostruct'
# hash = { "country" => "Australia", :population => 20_000_000 }
@ -41,7 +89,11 @@ class OpenStruct
#
# p data # -> <OpenStruct country="Australia" population=20000000>
#
# By default, the resulting OpenStruct object will have no attributes.
# You may also define the hash in the initialization call:
#
# australia = OpenStruct.new(:country => "Australia",
# :population => 20_000_000)
# p australia # -> <OpenStruct country="Australia" population=20000000>
#
def initialize(hash=nil)
@table = {}
@ -59,14 +111,43 @@ class OpenStruct
@table = @table.dup
end
#
# Provides marshalling support for use by the Marshal library. Returning the
# underlying Hash table that contains the functions defined as the keys and
# the values assigned to them.
#
# require 'ostruct'
#
# person = OpenStruct.new
# person.name = 'John Smith'
# person.age = 70
#
# person.marshal_dump # => { :name => 'John Smith', :age => 70 }
#
def marshal_dump
@table
end
#
# Provides marshalling support for use by the Marshal library. Accepting
# a Hash of keys and values which will be used to populate the internal table
#
# require 'ostruct'
#
# event = OpenStruct.new
# hash = { 'time' => Time.now, 'title' => 'Birthday Party' }
# event.marshal_load(hash)
# event.title # => 'Birthday Party'
#
def marshal_load(x)
@table = x
@table.each_key{|key| new_ostruct_member(key)}
end
#
# #modifiable is used internally to check if the OpenStruct is able to be
# modified before granting access to the internal Hash table to be augmented.
#
def modifiable
begin
@modifiable = true
@ -77,6 +158,11 @@ class OpenStruct
end
protected :modifiable
#
# new_ostruct_member is used internally to defined properties on the
# OpenStruct. It does this by using the metaprogramming function
# define_method for both the getter method and the setter method.
#
def new_ostruct_member(name)
name = name.to_sym
unless self.respond_to?(name)
@ -104,7 +190,14 @@ class OpenStruct
end
#
# Remove the named field from the object.
# Remove the named field from the object. Returning the value that the field
# contained if it has defined.
#
# require 'ostruct'
#
# person = OpenStruct.new('name' => 'John Smith', 'age' => 70)
#
# person.delete_field('name') # => 'John Smith'
#
def delete_field(name)
sym = name.to_sym
@ -144,7 +237,9 @@ class OpenStruct
protected :table
#
# Compare this object and +other+ for equality.
# Compares this object and +other+ for equality. An OpenStruct is equal to
# +other+ when +other+ is an OpenStruct and the two object's Hash tables are
# equal.
#
def ==(other)
return false unless(other.kind_of?(OpenStruct))