Class: JsonCompare::Comparer

Inherits:
Object
  • Object
show all
Defined in:
lib/json-compare/comparer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#excluded_keys ⇒ Object

Returns the value of attribute excluded_keys.



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# File 'lib/json-compare/comparer.rb', line 4

def excluded_keys
  @excluded_keys
end

Instance Method Details

#compare_arrays(old_array, new_array) ⇒ Object 



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# File 'lib/json-compare/comparer.rb', line 53

def compare_arrays(old_array, new_array)
  old_array_length = old_array.count
  new_array_length = new_array.count
  inters = [old_array.count, new_array.count].min

  result = get_diffs_struct

  (0..inters).map do |n|
    res = compare_elements(old_array[n], new_array[n])
    result[:update][n] = res unless (res.nil? || (res.respond_to?(:empty?) && res.empty?))
  end

  # the rest of the larger array
  if inters == old_array_length
    (inters..new_array_length).each do |n|
      result[:append][n] = new_array[n]
    end
  else
    (inters..old_array_length).each do |n|
      result[:remove][n] = old_array[n]
    end
  end

  filter_results(result)
end

#compare_elements(old, new) ⇒ Object 



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# File 'lib/json-compare/comparer.rb', line 10

def compare_elements(old, new)
  diff = {}
  if old.kind_of? Hash
    if new.kind_of? Array
      diff_hash = compare_hash_array(old, new)
    else
      diff_hash = compare_hashes(old, new)
    end
    diff = diff_hash if diff_hash.count > 0
  elsif (!is_boolean(old) || !is_boolean(new)) && old.class != new.class
    diff = new
  elsif old.kind_of? Array
    diff_arr = compare_arrays(old, new)
    diff = diff_arr if diff_arr.count > 0
  else
    string_diff = compare_strings(old, new)
    diff = string_diff unless string_diff.nil?
  end
  diff
end

#compare_hash_array(old_hash, new_array) ⇒ Object 



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# File 'lib/json-compare/comparer.rb', line 79

def compare_hash_array(old_hash, new_array)
  result = get_diffs_struct

  (0..new_array.count).map do |n|
    next if new_array[n].nil?
    if n == 0
      res = compare_elements(old_hash, new_array[0])
      result[:update][n] = res unless res.empty?
    else
      result[:append][n] = new_array[n]
    end
  end

  filter_results(result)
end

#compare_hashes(old_hash, new_hash) ⇒ Object 



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# File 'lib/json-compare/comparer.rb', line 31

def compare_hashes(old_hash, new_hash)
  old_hash = old_hash == nil ? {} : old_hash
  new_hash = new_hash == nil ? {} : new_hash
  keys = (old_hash.keys + new_hash.keys).uniq
  result = get_diffs_struct
  keys.each do |k|
    if !old_hash.has_key? k
      result[:append][k] = new_hash[k]
    elsif !new_hash.has_key? k
      result[:remove][k] = old_hash[k]
    else
      diff = compare_elements(old_hash[k], new_hash[k])
      if diff.respond_to? "empty?"
        result[:update][k] = diff unless diff.empty?
      else
        result[:update][k] = diff # some classes have no empty? method
      end
    end
  end
  filter_results(result)
end

#compare_strings(old_string, new_string) ⇒ Object 



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# File 'lib/json-compare/comparer.rb', line 95

def compare_strings(old_string, new_string)
  (old_string != new_string) ? new_string.to_s : ""
end

#filter_results(result) ⇒ Object 



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# File 'lib/json-compare/comparer.rb', line 104

def filter_results(result)
  return {} if result.nil?
  out_result = {}
  result.each_key do |change_type|
    next if result[change_type].nil?
    temp_hash = {}
    result[change_type].each_key do |key|
      next if result[change_type][key].nil?
      next if @excluded_keys.include? key
      temp_hash[key] = result[change_type][key]
    end
    out_result[change_type] = temp_hash if temp_hash.count > 0
  end
  out_result
end

#get_diffs_struct ⇒ Object

Returns diffs-hash with bare structure



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# File 'lib/json-compare/comparer.rb', line 100

def get_diffs_struct
  {:append => {}, :remove => {},:update => {}}
end

#is_boolean(obj) ⇒ Object 



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# File 'lib/json-compare/comparer.rb', line 6

def is_boolean(obj)
  !!obj == obj
end