Class: OrderedHash

Inherits:
Object show all
Includes:
Enumerable
Defined in:
lib/rbcurse/core/include/orderedhash.rb

Overview

Insert order preserving hash Thanks to Bill Kelly, posted on www.ruby-forum.com/topic/166075

Instance Method Summary collapse

Constructor Details

#initialize(*args, &block) ⇒ OrderedHash

Returns a new instance of OrderedHash.



7
8
9
10
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 7

def initialize(*args, &block)
  @h = Hash.new(*args, &block)
  @ordered_keys = []
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(*args) ⇒ Object 



74
75
76
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 74

def method_missing(*args)
  @h.send(*args)
end

Instance Method Details

#[]=(key, val) ⇒ Object 



12
13
14
15
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 12

def []=(key, val)
  @ordered_keys << key unless @h.has_key? key
  @h[key] = val
end

#clear ⇒ Object 



38
39
40
41
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 38

def clear
  @ordered_keys.clear
  @h.clear
end

#delete(k, &block) ⇒ Object 



43
44
45
46
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 43

def delete(k, &block)
  @ordered_keys.delete k
  @h.delete(k, &block)
end

#delete_if(&block) ⇒ Object 



55
56
57
58
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 55

def delete_if(&block)
  reject!(&block)
  self
end

#each ⇒ Object Also known as: each_pair 



17
18
19
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 17

def each
  @ordered_keys.each {|k| yield(k, @h[k])}
end

#each_key ⇒ Object 



26
27
28
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 26

def each_key
  @ordered_keys.each {|k| yield k}
end

#each_value ⇒ Object 



22
23
24
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 22

def each_value
  @ordered_keys.each {|k| yield(@h[k])}
end

#inspect ⇒ Object

added since the normal hash will give it in unordered. so debugging sucks



60
61
62
63
64
65
66
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 60

def inspect
  out = []
  each do | k,v |
    out << " #{k} => #{v} "
  end
  res = %Q[  { #{out.join(",\n ")} } ]
end

#keys ⇒ Object 



30
31
32
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 30

def keys
  @ordered_keys
end

#reject! ⇒ Object 



48
49
50
51
52
53
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 48

def reject!
  del = []
  each_pair {|k,v| del << k if yield k,v}
  del.each {|k| delete k}
  del.empty? ? nil : self
end

#values ⇒ Object 



34
35
36
 
# File 'lib/rbcurse/core/include/orderedhash.rb', line 34

def values
  @ordered_keys.map {|k| @h[k]}
end