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Contents
# frozen_string_literal: true
class Serega
#
# Utilities
#
module SeregaUtils
#
# Utility to count regular parameters of callable object
#
class ParamsCount
NO_NAMED_REST_PARAM = [:rest].freeze
private_constant :NO_NAMED_REST_PARAM
class << self
#
# Count parameters for callable object
#
# @param object [#call] callable object
#
# @return [Integer] count of regular parameters
#
def call(object, max_count:)
# Procs (but not lambdas) can accept all provided parameters
parameters = object.is_a?(Proc) ? object.parameters : object.method(:call).parameters
return 1 if parameters[0] == NO_NAMED_REST_PARAM
return max_count if object.is_a?(Proc) && !object.lambda?
count = 0
# If all we have is no-name *rest parameters, then we assume we need to provide
# 1 argument. It is now always correct, but in serialization context it's most common that
# only one argument is needed.
parameters.each do |parameter|
next if parameter == NO_NAMED_REST_PARAM # Workaround for procs like :odd?.to_proc
param_type = parameter[0]
case param_type
when :req then count += 1
when :opt then count += 1 if count < max_count
when :rest then count += max_count - count if max_count > count
end # else :opt, :keyreq, :key, :keyrest, :block - do nothing
end
count
end
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems