# frozen_string_literal: true

require "uri"

module ActionDispatch
  class QueryParser
    DEFAULT_SEP = /& */n
    COMMON_SEP = { ";" => /; */n, ";," => /[;,] */n, "&" => /& */n }

    #--
    # Note this departs from WHATWG's specified parsing algorithm by
    # giving a nil value for keys that do not use '='. Callers that need
    # the standard's interpretation can use `v.to_s`.
    def self.each_pair(s, separator = nil)
      return enum_for(:each_pair, s, separator) unless block_given?

      (s || "").split(separator ? (COMMON_SEP[separator] || /[#{separator}] */n) : DEFAULT_SEP).each do |part|
        next if part.empty?

        k, v = part.split("=", 2)

        k = URI.decode_www_form_component(k)
        v &&= URI.decode_www_form_component(v)

        yield k, v
      end

      nil
    end
  end
end