Class: Mail::Jdec::ValueDecoder

Inherits:
Object
  • Object
show all
Extended by:
Constants
Defined in:
lib/mail/jdec/decoder.rb

Class Method Summary collapse

Class Method Details

.value_decode(str) ⇒ Object 



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# File 'lib/mail/jdec/decoder.rb', line 42

def value_decode(str)
  # Optimization: If there's no encoded-words in the string, just return it
  return str unless str =~ ENCODED_VALUE

  lines = Mail::Encodings.send(:collapse_adjacent_encodings, str)

  lines = lines.chunk do |value|
    if value =~ ENCODED_VALUE
      $1
    else
      ''
    end
  end

  # Split on white-space boundaries with capture, so we capture the white-space as well
  lines.map do |charset, values|
    content = values.join
    if content =~ ENCODED_VALUE
      bytes = content.scan(/\=\?([^?]+)\?([QB])\?([^?]*?)\?\=/mi).map do |_, encoding, encoded|
        case encoding
        when *B_VALUES then Mail::Utilities.decode_base64(encoded)
        when *Q_VALUES then Mail::Encodings::QuotedPrintable.decode(encoded.gsub(/_/, '=20').sub(/\=$/, ''))
        end
      end.join('')
      Mail::Encodings.transcode_charset(bytes, charset)
    else
      content
    end
  end.join('')
end