Class: Mail::Multibyte::Unicode::UnicodeDatabase

Inherits:
Object
  • Object
show all
Defined in:
lib/mail/multibyte/unicode.rb

Overview

Holds static data from the Unicode database

Constant Summary collapse

ATTRIBUTES = 
:codepoints, :composition_exclusion, :composition_map, :boundary, :cp1252

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ UnicodeDatabase

Returns a new instance of UnicodeDatabase.



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# File 'lib/mail/multibyte/unicode.rb', line 335

def initialize
  @codepoints = Hash.new(Codepoint.new)
  @composition_exclusion = []
  @composition_map = {}
  @boundary = {}
  @cp1252 = {}
end

Class Method Details

.dirname ⇒ Object

Returns the directory in which the data files are stored



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# File 'lib/mail/multibyte/unicode.rb', line 377

def self.dirname
  File.dirname(__FILE__) + '/../values/'
end

.filename ⇒ Object

Returns the filename for the data file for this version



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# File 'lib/mail/multibyte/unicode.rb', line 382

def self.filename
  File.expand_path File.join(dirname, "unicode_tables.dat")
end

Instance Method Details

#load ⇒ Object

Loads the Unicode database and returns all the internal objects of UnicodeDatabase.



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# File 'lib/mail/multibyte/unicode.rb', line 354

def load
  begin
    @codepoints, @composition_exclusion, @composition_map, @boundary, @cp1252 = File.open(self.class.filename, 'rb') { |f| Marshal.load f.read }
  rescue => e
      raise IOError.new("Couldn't load the Unicode tables for UTF8Handler (#{e.message}), Mail::Multibyte is unusable")
  end

  # Redefine the === method so we can write shorter rules for grapheme cluster breaks
  @boundary.each do |k,_|
    @boundary[k].instance_eval do
      def ===(other)
        detect { |i| i === other } ? true : false
      end
    end if @boundary[k].kind_of?(Array)
  end

  # define attr_reader methods for the instance variables
  class << self
    attr_reader(*ATTRIBUTES)
  end
end