Class: Hash

Inherits:
Object
  • Object
show all
Defined in:
lib/knut_tools/yaml.rb

Overview

Modify Hash, so to_yaml will output sorted by key

Instance Method Summary collapse

Instance Method Details

#to_yaml(emitter = {}) ⇒ Object

Unfortenatly the option :SortKeys => true isn’t supported in yaml-original.

This extension adds this feature. Default is sorted, you may set it off.

If the keys may not be sorted “natural”, all keys are converted to Strings and the sorted. Mixtures of numbers and Strings will result in character sorted values (‘10’ will be before 2).

If the keys can’t be sorted (e.g. symbols…), the result keeps unsorted.

Source: groups.google.de/group/comp.lang.ruby/browse_thread/thread/813cd7086e37f004/3057ffb1ebd96a8d



57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'lib/knut_tools/yaml.rb', line 57

def to_yaml( emitter = {} )
=begin
opt is a #<YAML::Syck::Emitter:0x2c182a0>

I don't know how to get access to the ":SortKeys => true"-value correct.
=end

 #~ opts = emitter
 #~ case emitter
   #~ when YAML::Syck::Emitter
     #~ opts = emitter.instance_variable_get('@options')
 #~ end
 
  YAML::quick_emit( object_id, emitter ) do |out| 
    out.map( taguri, to_yaml_style ) do |map| 
     #~ if opts[:SortKeys] ## fails in nesting, so let's just always sort 
        sorted_keys = keys 
        sorted_keys = begin 
          sorted_keys.sort 
        rescue 
          sorted_keys.sort_by {|k| k.to_s} rescue sorted_keys 
        end 

        sorted_keys.each do |k| 
          map.add( k, fetch(k) ) 
        end 
     #~ else 
       #~ each do |k, v| 
         #~ map.add( k, v ) 
       #~ end 
     #~ end 
    end 
  end 
end