Module: GoogleWebTranslate::StringEscaping

Defined in:
lib/google_web_translate/string_escaping.rb

Overview

String escaping/unescaping code from syck/encoding.rb

Constant Summary collapse

ESCAPES = 
%w[\x00 \x01 \x02 \x03 \x04 \x05 \x06 \a
\x08 \t \n \v \f
\r \x0e \x0f
\x10 \x11 \x12 \x13 \x14 \x15 \x16 \x17
\x18 \x19 \x1a \e \x1c \x1d \x1e \x1f].freeze
UNESCAPES = 
{
  'a' => "\x07", 'b' => "\x08", 't' => "\x09",
  'n' => "\x0a", 'v' => "\x0b", 'f' => "\x0c",
  'r' => "\x0d", 'e' => "\x1b", '\\' => '\\'
}.freeze

Class Method Summary collapse

Class Method Details

.escape(value, skip = '') ⇒ String

Escape unprintable characters such as newlines.

Parameters:

  • value (String) —

    The string to escape

  • skip (String) (defaults to: '') —

    Characters to not escape

Returns:

  • (String) —

    The string with special characters escaped.



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# File 'lib/google_web_translate/string_escaping.rb', line 20

def escape(value, skip = '')
  value.gsub(/\\/, '\\\\\\')
       .gsub(/"/, '\\"')
       .gsub(/([\x00-\x1f])/) do
    skip[$&] || ESCAPES[ $&.unpack('C')[0] ]
  end
end

.unescape(value) ⇒ String

Unescape character escapes such as “n” to their character equivalents.

Parameters:

  • value (String) —

    The string to unescape

Returns:

  • (String) —

    The string with special characters unescaped.



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# File 'lib/google_web_translate/string_escaping.rb', line 31

def unescape(value)
  regex = /\\(?:([nevfbart\\])|0?x([0-9a-fA-F]{2})|u([0-9a-fA-F]{4}))/
  value.gsub(regex) do
    if Regexp.last_match(3)
      [Regexp.last_match(3).to_s.hex].pack('U*')
    elsif Regexp.last_match(2)
      [Regexp.last_match(2)].pack('H2')
    else
      UNESCAPES[Regexp.last_match(1)]
    end
  end
end

.unquote(value) ⇒ Object 



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# File 'lib/google_web_translate/string_escaping.rb', line 44

def unquote(value)
  if value && value[0] == value[-1] && %w[' "].include?(value[0])
    value[1...-1]
  else
    value
  end
end