Module: Littlestitious::ClassMethods

Defined in:
lib/littlestitious.rb

Instance Method Summary collapse

Instance Method Details

#inheritable_attrs(*args) ⇒ Object 



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# File 'lib/littlestitious.rb', line 16

def inheritable_attrs(*args)
  args.flatten!
  @inheritable_attrs ||= [:inheritable_attrs]

  args -= @inheritable_attrs
  @inheritable_attrs += args

  args.each do |arg|
    class_eval %(
      class << self; attr_accessor :#{arg} end
    )
  end

  @inheritable_attrs
end

#inherited(subclass) ⇒ Object 



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# File 'lib/littlestitious.rb', line 32

def inherited(subclass)
  @inheritable_attrs.each do |inheritable_attribute|

    instance_var = "@#{inheritable_attribute}"
    value = instance_variable_get instance_var

    subclass.instance_variable_set instance_var, value

  end
end

#initialize_littlestitious_vars(base) ⇒ Object

Raises:

  • (AssertionError) 


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# File 'lib/littlestitious.rb', line 43

def initialize_littlestitious_vars(base)

  @zero_width_chars = {
    word_joiner:                   "\u2060",
    mongolian_vowel_separator:     "\u180e",
    zero_width_non_joiner:         "\u200c",
    zero_width_joiner:             "\u200d",
    zero_width_space:              "\u200b",
    zero_width_non_breaking_space: "\ufeff"
  }

  @weird_space_chars = {
    non_breaking_space:        "\u00a0",
    ogham_space:               "\u1680",
    en_quad_space:             "\u2000",
    em_quad_space:             "\u2001",
    en_space:                  "\u2002",
    em_space:                  "\u2003",
    three_per_em_space:        "\u2004",
    four_per_em_space:         "\u2005",
    six_per_em_space:          "\u2006",
    hair_space:                "\u200a",
    narrow_non_breaking_space: "\u202f",
    medium_mathematical_space: "\u205f",
    spc_symbol:                "\u2420",
    brail_pattern_blank:       "\u2800",
    ideographic_space:         "\u3000"
  }

  # At some point work these into a newline fingerprint
  # detector—it's harder than it looks because systems
  # are inconsistent.
  @new_line_chars = {
    line_feed:       "\u000a",
    carriage_return: "\u000d"
  }

  @non_printing_chars = {
    null:                 "\u0000",
    start_of_heading:     "\u0001",
    start_of_text:        "\u0002",
    end_of_text:          "\u0003",
    end_of_transmission:  "\u0004",
    enquiry:              "\u0005",
    acknowledge:          "\u0006",
    bell_alert:           "\u0007",
    backspace:            "\u0008",
    character_tabulation: "\u0009",

    line_tabulation:      "\u000b",
    form_feed:            "\u000c",

    shift_out:            "\u000e",
    shift_in:             "\u000f",
    data_link_escape:     "\u0010",
    device_control_1:     "\u0011",
    device_control_2:     "\u0012",
    device_control_3:     "\u0013",
    device_control_4:     "\u0014",
    negative_acknowledge: "\u0015",
    synchronous_idle:     "\u0016",
    end_of_trans_block:   "\u0017",
    cancel:               "\u0018",
    end_of_medium:        "\u0019",
    substitute:           "\u001a",
    escape:               "\u001b",
    file_separator:       "\u001c",
    group_separator:      "\u001d",
    record_separator:     "\u001e",
    unit_separator:       "\u001f",

    reverse_line_feed:    "\u008d",
    cancel_character:     "\u0094"
  }

  char_sub_group_syms = [ :weird_space_chars,
                          :non_printing_chars,
                          :zero_width_chars ]

  char_sub_groups = char_sub_group_syms.map do |sym|
    instance_variable_get "@#{sym}"
  end

  @all_chars = { checkmark: "\u2713" }

  char_sub_groups.each { | group | @all_chars.merge! group }

  @char_groups = [ @all_chars ] + char_sub_groups

  @char_groups.map do |char_group|
    char_group.transform_values! { |v| v.encode "utf-8" }
    char_group.freeze
  end

  @char_lookup = {}
  @all_chars.map { |k, v| @char_lookup[v] = k }

  size_ok = @char_lookup.size == @all_chars.size
  message = "Mismatched charater mapping"
  raise AssertionError, message unless size_ok

  class_instance_vars = \
  [ :all_chars, :char_lookup ] + char_sub_group_syms

  inheritable_attrs class_instance_vars

end