[ruby-core:84242] [Ruby trunk Feature#12275] String unescape

Issue #12275 has been updated by tad (Tadashi Saito).

File v3.patch added

Thanks to shyouhei, mame, and especially naruse, I was able to brush up the patch.
v3.patch is attached.  Improvements are diverse.

Spec change:

* use RuntimeError instead of ArgumentError for invalid formed (self) string
  * no arguments are given for this method... :(
* explicitly reject string that contains:
  * non-ascii character
  * NUL `\0` character
  * (note that `dump`ed strings do not contain above)

Bug fix:

* reject string that contains double quote in double quotes, like `'""""'`
* prevent compiler's warnings/errors
  * cast explicitly from unsigned long to int
  * remove needless "const"

Misc:

* fix styles
* add more tests for invalid escaping
* remove needless logic
* adjust unescaped expression to parse.y

I'll take a short nap while praying so that AFL will not catch the worm...


----------------------------------------
Feature #12275: String unescape
https://bugs.ruby-lang.org/issues/12275#change-68371

* Author: asnow (Andrew Bolshov)
* Status: Assigned
* Priority: Normal
* Assignee: tad (Tadashi Saito)
* Target version: 
----------------------------------------
I think it will be usefull to have function that convert input string as it was written in prime qouted string or in double qouted string. It's part of metaprogramming.
Example:

~~~ ruby
class String
  # Create new string like it will be writed in qoutes. Optional argument define type of qouting used: true - prime qoute, false - double qoute. Default is double qoute.
  def unescape prime = false
    eval( prime ? "'#{self}'" : "\"#{self}\"" )
  end
end

"\\\t".unescape # => "\t"
~~~

Other requests:
http://www.rubydoc.info/github/ronin-ruby/ronin-support/String:unescape
http://stackoverflow.com/questions/4265928/how-do-i-unescape-c-style-escape-sequences-from-ruby
http://stackoverflow.com/questions/8639642/best-way-to-escape-and-unescape-strings-in-ruby

Realized
http://www.rubydoc.info/github/ronin-ruby/ronin-support/String:unescape

---Files--------------------------------
benchmark.rb (193 Bytes)
v1.patch (8.95 KB)
benchmark2.rb (315 Bytes)
v2.patch (12.1 KB)
v3.patch (12.9 KB)


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