module Versionomy::Format::Rubygems

# File lib/versionomy/format_definitions/rubygems.rb, line 122
def self.create

  # The following is the definition of the rubygems schema
  schema_ = Schema.create do

    # Global comparison function
    to_compare_type(:string) do |a_, b_|
      if a_.kind_of?(::Integer)
        if b_.kind_of?(::Integer)
          a_ <=> b_
        else
          1
        end
      else
        if b_.kind_of?(::Integer)
          -1
        else
          a_ <=> b_
        end
      end
    end

    # Global canonicalization function
    to_canonicalize_type(:string) do |val_|
      if val_.kind_of?(::Integer)
        val_
      else
        val_ = val_.to_s
        if val_ =~ /\A\d*\z/
          val_.to_i
        else
          val_
        end
      end
    end

    # The first field has the default value of 1. All other fields
    # have a default value of 0. Thus, the default version number
    # overall is "1.0".
    field(:field0, :type => :integer, :default_value => 1) do
      field(:field1, :type => :string) do
        field(:field2, :type => :string) do
          field(:field3, :type => :string) do
            field(:field4, :type => :string) do
              field(:field5, :type => :string) do
                field(:field6, :type => :string) do
                  field(:field7, :type => :string)
                end
              end
            end
          end
        end
      end
    end

    # Some field aliases providing alternate names for major fields
    alias_field(:major, :field0)
    alias_field(:minor, :field1)

    # Add the methods in this module to each value
    add_module(Format::Rubygems::ExtraMethods)
  end

  # The following is the definition of the rubygems format. It
  # understands the rubygems schema defined above.
  Format::Delimiter.new(schema_) do

    # All version number strings must start with the major version.
    # Unlike other fields, it is not preceded by any delimiter.
    field(:field0) do
      recognize_number(:delimiter_regexp => '', :default_delimiter => '')
    end

    # The remainder of the version number are represented as strings
    # or integers delimited by periods by default. Each is also
    # dependent on the presence of the previous field, so
    # :requires_previous_field retains its default value of true.
    # Finally, they can be optional in an unparsed string if they are
    # set to the default value of 0.
    field(:field1) do
      recognize_regexp('[0-9a-zA-Z]+', :default_value_optional => true)
    end
    field(:field2) do
      recognize_regexp('[0-9a-zA-Z]+', :default_value_optional => true)
    end
    field(:field3) do
      recognize_regexp('[0-9a-zA-Z]+', :default_value_optional => true)
    end
    field(:field4) do
      recognize_regexp('[0-9a-zA-Z]+', :default_value_optional => true)
    end
    field(:field5) do
      recognize_regexp('[0-9a-zA-Z]+', :default_value_optional => true)
    end
    field(:field6) do
      recognize_regexp('[0-9a-zA-Z]+', :default_value_optional => true)
    end
    field(:field7) do
      recognize_regexp('[0-9a-zA-Z]+', :default_value_optional => true)
    end

    # By default, we require that at least the first two fields
    # appear in an unparsed version string.
    default_unparse_params(:required_fields => [:field1])
  end
end