Class: RuboCop::Cop::Lint::FormatParameterMismatch

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 137

def count_format_matches(node)
  [node.arguments.count - 1, expected_fields_count(node.first_argument)]
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 119

def count_matches(node)
  if countable_format?(node)
    count_format_matches(node)
  elsif countable_percent?(node)
    count_percent_matches(node)
  else
    [:unknown] * 2
  end
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 141

def count_percent_matches(node)
  [node.first_argument.child_nodes.count,
   expected_fields_count(node.receiver)]
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 129

def countable_format?(node)
  (sprintf?(node) || format?(node)) && !heredoc?(node)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 133

def countable_percent?(node)
  percent?(node) && node.first_argument.array_type?
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 153

def expected_fields_count(node)
  return :unknown unless string_type?(node)

  format_string = RuboCop::Cop::Utils::FormatString.new(node.source)
  return 1 if format_string.named_interpolation?

  max_digit_dollar_num = format_string.max_digit_dollar_num
  return max_digit_dollar_num if max_digit_dollar_num&.nonzero?

  format_string
    .format_sequences
    .reject(&:percent?)
    .reduce(0) { |acc, seq| acc + seq.arity }
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 168

def format?(node)
  format_method?(:format, node)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 146

def format_method?(name, node)
  return false if node.const_receiver? && !node.receiver.loc.name.is?(KERNEL)
  return false unless node.method?(name)

  node.arguments.size > 1 && string_type?(node.first_argument)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 64

def format_string?(node)
  called_on_string?(node) && method_with_format_args?(node)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 115

def heredoc?(node)
  node.first_argument.source[0, 2] == SHOVEL
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 68

def invalid_format_string?(node)
  string = if sprintf?(node) || format?(node)
             node.first_argument.source
           else
             node.receiver.source
           end
  !RuboCop::Cop::Utils::FormatString.new(string).valid?
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 91

def matched_arguments_count?(expected, passed)
  if passed.negative?
    expected < passed.abs
  else
    expected != passed
  end
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 186

def message(node)
  num_args_for_format, num_expected_fields = count_matches(node)

  method_name = node.method?(:%) ? 'String#%' : node.method_name

  format(MSG, arg_num: num_args_for_format, method: method_name,
              field_num: num_expected_fields)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 105

def method_with_format_args?(node)
  sprintf?(node) || format?(node) || percent?(node)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 77

def offending_node?(node)
  return false if splat_args?(node)

  num_of_format_args, num_of_expected_fields = count_matches(node)

  return false if num_of_format_args == :unknown

  first_arg = node.first_argument
  return false if num_of_expected_fields.zero? &&
                  (first_arg.dstr_type? || first_arg.array_type?)

  matched_arguments_count?(num_of_expected_fields, num_of_format_args)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 49

def on_send(node)
  return unless format_string?(node)

  if invalid_format_string?(node)
    add_offense(node.loc.selector, message: MSG_INVALID)
    return
  end

  return unless offending_node?(node)

  add_offense(node.loc.selector, message: message(node))
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 176

def percent?(node)
  receiver = node.receiver

  percent = node.method?(:%) && (string_type?(receiver) || node.first_argument.array_type?)

  return false if percent && string_type?(receiver) && heredoc?(node)

  percent
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 109

def splat_args?(node)
  return false if percent?(node)

  node.arguments.drop(1).any?(&:splat_type?)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 172

def sprintf?(node)
  format_method?(:sprintf, node)
end

# File 'lib/rubocop/cop/lint/format_parameter_mismatch.rb', line 195

def string_type?(node)
  STRING_TYPES.include?(node.type)
end