Module: RipperRubyParser::Unescape Private

Defined in:
lib/ripper_ruby_parser/unescape.rb

Overview

This module is part of a private API. You should avoid using this module if possible, as it may be removed or be changed in the future.

Implements string unescaping

Constant Summary collapse

SINGLE_LETTER_ESCAPES =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

{
  'a' => "\a",
  'b' => "\b",
  'e' => "\e",
  'f' => "\f",
  'n' => "\n",
  'r' => "\r",
  's' => "\s",
  't' => "\t",
  'v' => "\v"
}.freeze
SINGLE_LETTER_ESCAPES_REGEXP =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

Regexp.new("^[#{SINGLE_LETTER_ESCAPES.keys.join}]$")

Class Method Summary collapse

Class Method Details

.simple_unescape(string) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/ripper_ruby_parser/unescape.rb', line 23

def simple_unescape(string)
  string.gsub(/\\(
    '   | # single quote
    \\    # backslash
  )/x) do
    Regexp.last_match[1]
  end
end

.unescape(string) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/ripper_ruby_parser/unescape.rb', line 32

def unescape(string)
  string.gsub(/\\(
    [0-7]{1,3}        | # octal character
    x[0-9a-fA-F]{1,2} | # hex byte
    u[0-9a-fA-F]{4}   | # unicode character
    M-\\C-.           | # meta-ctrl
    C-\\M-.           | # ctrl-meta
    M-\\c.            | # meta-ctrl (shorthand)
    c\\M-.            | # ctrl-meta (shorthand)
    C-.               | # control (regular)
    c.                | # control (shorthand)
    M-.               | # meta
      .                   # single-character
  )/x) do
    bare = Regexp.last_match[1]
    case bare
    when SINGLE_LETTER_ESCAPES_REGEXP
      SINGLE_LETTER_ESCAPES[bare]
    when /^x/
      bare[1..-1].to_i(16).chr
    when /^u/
      bare[1..-1].to_i(16).chr(Encoding::UTF_8)
    when /^(c|C-).$/
      (bare[-1].ord & 0b1001_1111).chr
    when /^M-.$/
      (bare[-1].ord | 0b1000_0000).chr
    when /^(M-\\C-|C-\\M-|M-\\c|c\\M-).$/
      (bare[-1].ord & 0b1001_1111 | 0b1000_0000).chr
    when /^[0-7]+/
      bare.to_i(8).chr
    else
      bare
    end
  end
end