Module: Rjq::Value

Defined in:
lib/rjq/value.rb

Constant Summary collapse

TYPE_ORDER = 
{
  'null' => 0,
  'boolean' => 1,
  'number' => 2,
  'string' => 3,
  'array' => 4,
  'object' => 5
}.freeze

Class Method Summary collapse

Class Method Details

.compare(left, right) ⇒ Object 



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# File 'lib/rjq/value.rb', line 108

def compare(left, right)
  stack = [[:compare, left, right]]
  until stack.empty?
    action, left_value, right_value = stack.pop
    if action == :result
      return left_value unless left_value.zero?
      next
    end

    left_type = type_of(left_value)
    right_type = type_of(right_value)
    type_cmp = TYPE_ORDER.fetch(left_type) <=> TYPE_ORDER.fetch(right_type)
    return type_cmp unless type_cmp.zero?

    cmp = case left_type
          when 'null' then 0
          when 'boolean' then bool_rank(left_value) <=> bool_rank(right_value)
          when 'number' then numeric_compare(left_value, right_value)
          when 'string' then left_value <=> right_value
          when 'array'
            push_array_comparison(stack, left_value, right_value)
            0
          when 'object'
            push_object_comparison(stack, left_value, right_value)
            0
          end
    return cmp unless cmp.zero?
  end
  0
end

.deep_copy(value) ⇒ Object 



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# File 'lib/rjq/value.rb', line 156

def deep_copy(value)
  root = []
  active = {}
  stack = [[:copy, value, [:array, root, 0]]]
  until stack.empty?
    type, source, target = stack.pop
    case type
    when :leave
      active.delete(source)
    when :array_items
      original, copy, index = source
      next if index >= original.length

      stack << [:array_items, [original, copy, index + 1], nil]
      stack << [:copy, original[index], [:array, copy, index]]
    when :object_items
      original, copy, keys, index = source
      next if index >= keys.length

      key = keys[index]
      stack << [:object_items, [original, copy, keys, index + 1], nil]
      stack << [:copy, original.fetch(key), [:object, copy, key.dup]]
    when :copy
      copied = copy_scalar(source)
      if source.is_a?(Array)
        enter_copy_container!(source, active)
        copied = Array.new(source.length)
        stack << [:leave, source.object_id, nil]
        stack << [:array_items, [source, copied, 0], nil]
      elsif source.is_a?(Hash)
        validate_copy_keys!(source)
        enter_copy_container!(source, active)
        copied = {}
        stack << [:leave, source.object_id, nil]
        stack << [:object_items, [source, copied, source.keys, 0], nil]
      end
      assign_copy(target, copied)
    end
  end
  root.fetch(0)
end

.equal?(left, right) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rjq/value.rb', line 79

def equal?(left, right)
  stack = [[left, right]]
  until stack.empty?
    left_value, right_value = stack.pop
    left_type = type_of(left_value)
    right_type = type_of(right_value)
    if left_type == 'number' && right_type == 'number'
      return false unless numeric_equal?(left_value, right_value)
      next
    end
    return false unless left_type == right_type

    case left_type
    when 'array'
      return false unless left_value.length == right_value.length

      (left_value.length - 1).downto(0) { |index| stack << [left_value[index], right_value[index]] }
    when 'object'
      left_keys = left_value.keys.sort
      return false unless left_keys == right_value.keys.sort

      left_keys.reverse_each { |key| stack << [left_value.fetch(key), right_value.fetch(key)] }
    else
      return false unless left_value == right_value
    end
  end
  true
end

.merge_objects(left, right) ⇒ Object 



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# File 'lib/rjq/value.rb', line 139

def merge_objects(left, right)
  merged = left.merge(right)
  stack = [[left, right, merged]]
  until stack.empty?
    left_object, right_object, output = stack.pop
    right_object.each do |key, right_value|
      left_value = left_object[key]
      next unless left_value.is_a?(Hash) && right_value.is_a?(Hash)

      child = left_value.merge(right_value)
      output[key] = child
      stack << [left_value, right_value, child]
    end
  end
  merged
end

.truthy?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rjq/value.rb', line 35

def truthy?(value)
  !(value.nil? || value == false)
end

.type_of(value) ⇒ Object 



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# File 'lib/rjq/value.rb', line 16

def type_of(value)
  case value
  when NilClass
    'null'
  when TrueClass, FalseClass
    'boolean'
  when Numeric
    'number'
  when String
    'string'
  when Array
    'array'
  when Hash
    'object'
  else
    raise TypeError, "unsupported value type: #{value.class}"
  end
end

.validate!(value) ⇒ Object 



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# File 'lib/rjq/value.rb', line 39

def validate!(value)
  active = {}
  stack = [[:value, value]]
  until stack.empty?
    type, item = stack.pop
    if type == :leave
      active.delete(item)
      next
    end

    case item
    when NilClass, TrueClass, FalseClass, Numeric
      next
    when String
      raise TypeError, 'invalid UTF-8 string' unless item.encoding == Encoding::UTF_8 && item.valid_encoding?
    when Array
      enter_validation_container!(item, active)
      stack << [:leave, item.object_id]
      item.reverse_each { |child| stack << [:value, child] }
    when Hash
      invalid = item.keys.find { |key| !key.is_a?(String) }
      raise TypeError, "object key must be a string, got #{invalid.class}" if invalid

      enter_validation_container!(item, active)
      stack << [:leave, item.object_id]
      item.values.reverse_each { |child| stack << [:value, child] }
    else
      raise TypeError, "unsupported value type: #{item.class}"
    end
  end
  value
end