Class: Serega::SeregaUtils::MethodSignature

Inherits:
Object
  • Object
show all
Defined in:
lib/serega/utils/method_signature.rb

Overview

Utility to make method arguments signature

Class Method Summary collapse

Class Method Details

.call(callable, pos_limit:, keyword_args: []) ⇒ String

Generates method arguments signature

Parameters:

  • callable (#call) —

    callable object

  • pos_limit (Integer) —

    Max count of positional parameters

  • keyword_args (Array<Symbol>) (defaults to: []) —

    List of accepted keyword argument names

Returns:

  • (String) —

    Method signature which consist of number of positional parameters and keyword parameter names joined with undescrore.



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# File 'lib/serega/utils/method_signature.rb', line 28

def call(callable, pos_limit:, keyword_args: [])
  params = callable.is_a?(Proc) ? callable.parameters : callable.method(:call).parameters

  # Procs (but not lambdas) can accept all provided parameters
  return full_signature(pos_limit, keyword_args) if params.empty? && callable.is_a?(Proc) && !callable.lambda?

  # Return single positional argument for Symbol#to_proc
  return "1" if (params == SYMBOL_TO_PROC_SIGNATURE_RUBY2) || (params == SYMBOL_TO_PROC_SIGNATURE_RUBY3)

  keyword_args = keyword_args.dup

  # signature parts
  positional_parameters = 0
  keyword_parameters = []

  params.each do |type, name|
    case type
    when :req, :opt
      positional_parameters += 1
      pos_limit -= 1
    when :rest
      next if pos_limit <= 0

      positional_parameters += pos_limit
      pos_limit = 0
    when :key, :keyreq
      keyword_parameters << name
      keyword_args.delete(name)
    when :keyrest
      keyword_parameters.concat(keyword_args)
      keyword_args.clear
    end
  end

  build_signature_string(positional_parameters, keyword_parameters)
end