Class: RightSupport::Data::HashTools::DeepSortedJsonState

Inherits:
Object
  • Object
show all
Defined in:
lib/right_support/data/hash_tools.rb

Instance Method Summary collapse

Constructor Details

#initialize(pretty) ⇒ DeepSortedJsonState

Initializer.

Parameters



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# File 'lib/right_support/data/hash_tools.rb', line 268

def initialize(pretty)
  # copy one of the JSON state prototypes in order to agree with recursive
  # depth and other state variables.
  @state = (pretty ? JSON::PRETTY_STATE_PROTOTYPE : JSON::FAST_STATE_PROTOTYPE).dup

  # note that the native JSON extension *may* keep the following state
  # strings as internal ruby strings in which case the state accessor (i.e.
  # state.object_nl) returns a pointer to a char array instead of a String
  # object. the trivial solution is to hardcode the 'pretty' strings here
  # instead of trying to infer the proper string objects.
  if pretty
    @object_nl = "\n"
    @indent    = '  '
    @space     = ' '
  else
    @object_nl = ''
    @indent    = ''
    @space     = ''
  end
end

Instance Method Details

#generate(hash) ⇒ String

Generates a JSONified hash string where key/value pairs are sorted by the stringified key.

Note that this algoritm is loosely based on the json_pure implementation for Hash.

Parameters

Return



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# File 'lib/right_support/data/hash_tools.rb', line 300

def generate(hash)
  delim = ','
  delim << @object_nl
  result = '{'
  result << @object_nl
  depth = @state.depth += 1
  first = true

  sorted_pairs = hash.to_a.map { |key, value| [key.to_s, value] }.sort
  sorted_pairs.each do |key, value|
    result << delim unless first
    result << @indent * depth
    result << key.to_s.to_json(@state)
    result << ':'
    result << @space
    if ::RightSupport::Data::HashTools.hashable?(value)
      result << generate(value)
    else
      result << value.to_json(@state)
    end
    first = false
  end
  depth = @state.depth -= 1
  result << @object_nl
  result << @indent * depth
  result << '}'
  result
end