Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/hexutils.rb

Overview

todo/check:

  allow/ignore whitespaces [ \t\n\r] in hex strings why? why not?

or add option with ignore e.g. ':' or such - why? why not?

Instance Method Summary collapse

Instance Method Details

#hex? ⇒ Boolean Also known as: is_hex? 



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

def hex?
   if self.empty?
     ## make empty string (e.g.'') a valid hex string - why? why not?

     ##   note:  0x (prefix only) is NOT a valid hex string

      true
   elsif self =~ /\A(0[xX])?[0-9a-fA-F]+\z/
     ## note:  allow 0x0 or 0xf  too or 0xfff or 0x123

     ##            that is uneven hexstrings

     ##                 a byte assumes always two chars

      true
   else
      false
   end
end

#to_hex ⇒ Object Also known as: hex 



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

def to_hex
  if self.empty?
     ## change encoding to utf_8 - why? why not?

     ##  always return a new string  why? why not?

    ''  ## note: assume utf_8 encoding for new string

  else
     ## note: always return a hex string with default encoding e.g. utf-8 - why? why not?

     ### check if unpack always works on bytes (or .b required???)

     self.unpack( 'H*' ).first.force_encoding( Encoding::UTF_8 )
  end
end