From String#undump to String#unescape

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The document discusses the introduction of the built-in Ruby method string#undump in Ruby 2.5, which serves as the inverse of string#dump by converting printable ASCII strings back to their original unescaped format. It outlines the motivation for its implementation, citing the need to read access logs from nginx and the challenges faced in creating an effective solution. Additionally, it mentions the development of an external gem, string_unescape, to address limitations and enhance functionality.

Software

From
String#undump
to
String#unescape
斎藤ただしただし
Tadashi Saito

New (unknown)
built-in method in
Ruby 2.5
[bug#12275]

From the document:
Produces a version of str with
all non-printing characters
replaced by nnn notation and
all special characters escaped.

String#undump
(almost) does
unescape from
printable ASCII

1. backslash + one character n t
2. x + 2 hex digits x12
3. u + 4 hex digits u1234
etc etc...

because notations used
in #dump is commonly
used among various
languages
#undump is useful

＿人人人人人人人人人＿
＞　Suddenly Nginx　＜
￣Y^Y^Y^Y^Y^Y^Y^Y￣

In fact, Nginx was
my trigger to
implement
String#undump

"We need to implement
String#undump to read access log
that Nginx writes"

Nginx module
ngx_http_log_module
(access_log, log_format)
spec:

Access: /api/{URL-escaped-mbchars}
Automatically!

Access: /api/{URL-escaped-mbchars}
↓
Internally: /api/{raw-mbchars}
Automatically!

Access: /api/{URL-escaped-mbchars}
↓
Internally: /api/{raw-mbchars}
↓
Log: /api/{xnn-escaped-mbchars}
Automatically!

/api/xe3x81x82xe3x81x82xe3x81x82xe3x81x82
/api/xe3x81x84xe3x81x84xe3x81x84xe3x81x84
/api/xe3x81x86xe3x81x86xe3x81x86xe3x81x86
/api/xe3x81x88xe3x81x88xe3x81x88xe3x81x88
/api/xe3x81x8axe3x81x8axe3x81x8axe3x81x8a
/api/xe3x81x8bxe3x81x8bxe3x81x8bxe3x81x8b
/api/xe3x81x8dxe3x81x8dxe3x81x8dxe3x81x8d
/api/xe3x81x8fxe3x81x8fxe3x81x8fxe3x81x8f
/api/xe3x81x91xe3x81x91xe3x81x91xe3x81x91
/api/xe3x81x93xe3x81x93xe3x81x93xe3x81x93
:
:
:
:

＿人人人人人人人人人人人人人人＿
＞ Can't change this behavior!! ＜
￣Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y￣
(at that time at least)

Too common
problem to
implement by
myself?

Stack Overflow:
Loose and partially
incomplete
codes ?

3. Final means:
Google it in
bugs.ruby-lang.org

●
Submitted about
a year ago
●
Specs (including the name
– most difficult part) were
almost fixed! ?

Matz:
"If someone
implement,
it's OK to add."

Shipped as
built-in String
method in
Ruby 2.5! ?

Thank you for
involved committer /
adviser (especially
@naruse)

#=> RuntimeError
(invalid dumped
string...)

●
undump-ed string must
be wrapped with "…"
like ‘”u1234”’
●
Because String#dump
always wraps with "..."
String#undump Spec

Reasonable as spec of
"inverse of #dump",
but...

●
A little dull to prepend / append ”
●
Both of the original use-case and
my case don't need this behavior

1. Extend existing spec like
str.undump(allow_no_quotes: true)

2. Introduce new method like
str.just_unescape_backslashed_chars

string_unescape
https://github.com/tadd/string_unescape

if self[0] == '"' && self[-1] == '"’
self
else
‘"’ + self + ‘”’
end.undump
Definition

puts
'/api/xe3x81x82'.unescape
#=> /api/あ

●
The name may have arguments
– Hard to merge into the core
●
But just works?

●
From business knowledge,
●
Found a potential
and generic problem
●
Implemented as
(core / external) method
Summary of What I did

Please make use
●
String#undump (built-in)
&
●
String#unescape
(string_unescape gem)
more!!1

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From String#undump to String#unescape

1. From String#undump to String#unescape 斎藤ただしただし Tadashi Saito

2. Do you know String#undump ?

3. New (unknown) built-in method in Ruby 2.5 [bug#12275]

4. What?

5. "Does inverse of String#dump"

6. end

7. 厂辞…

8. Do you know String#dump ?

9. From the document: Produces a version of str with all non-printing characters replaced by nnn notation and all special characters escaped.

10. In short: Escape to printable ASCII

11. Then,

12. String#undump (almost) does unescape from printable ASCII

13. Escape format example

14. 1. backslash + one character n t 2. x + 2 hex digits x12 3. u + 4 hex digits u1234 etc etc...

15. because notations used in #dump is commonly used among various languages #undump is useful

16. I saw first these in C

17. Ruby Python Java C# JSON Nginx…

18. ＿人人人人人人人人人＿＞　Suddenly Nginx　＜￣Y^Y^Y^Y^Y^Y^Y^Y￣

19. In fact, Nginx was my trigger to implement String#undump

20. "We need to implement String#undump to read access log that Nginx writes"

21. Nginx module ngx_http_log_module (access_log, log_format) spec:

22. Access: /api/{URL-escaped-mbchars} Automatically!

23. Access: /api/{URL-escaped-mbchars} ↓ Internally: /api/{raw-mbchars} Automatically!

24. Access: /api/{URL-escaped-mbchars} ↓ Internally: /api/{raw-mbchars} ↓ Log: /api/{xnn-escaped-mbchars} Automatically!

25. Access log looks like:

26. /api/xe3x81x82xe3x81x82xe3x81x82xe3x81x82 /api/xe3x81x84xe3x81x84xe3x81x84xe3x81x84 /api/xe3x81x86xe3x81x86xe3x81x86xe3x81x86 /api/xe3x81x88xe3x81x88xe3x81x88xe3x81x88 /api/xe3x81x8axe3x81x8axe3x81x8axe3x81x8a /api/xe3x81x8bxe3x81x8bxe3x81x8bxe3x81x8b /api/xe3x81x8dxe3x81x8dxe3x81x8dxe3x81x8d /api/xe3x81x8fxe3x81x8fxe3x81x8fxe3x81x8f /api/xe3x81x91xe3x81x91xe3x81x91xe3x81x91 /api/xe3x81x93xe3x81x93xe3x81x93xe3x81x93 : : : :

27. I CAN NOT READ for analysis ?

28. ＿人人人人人人人人人人人人人人＿＞ Can't change this behavior!! ＜￣Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y￣ (at that time at least)

29. ? Decode with Ruby!

30. 1. Write it by myself

31. Easily done, but...

32. Too common problem to implement by myself?

33. 2. Google it for gems / codes

34. No gems ?

35. Stack Overflow: Loose and partially incomplete codes ?

36. 3. Final means: Google it in bugs.ruby-lang.org

37. Ticket found! [bug#12275]

38. ● Submitted about a year ago ● Specs (including the name – most difficult part) were almost fixed! ?

39. Matz: "If someone implement, it's OK to add."

40. But no one implements...

41. ? ? Chance to commit!

42. I messed up and worked

43. Shipped as built-in String method in Ruby 2.5! ?

44. Thank you for involved committer / adviser (especially @naruse)

45. puts ‘/api/xe3x81x82’.undump

46. #=> RuntimeError (invalid dumped string...)

47. ● undump-ed string must be wrapped with "…" like ‘”u1234”’ ● Because String#dump always wraps with "..." String#undump Spec

48. Reasonable as spec of "inverse of #dump", but...

49. I have a little regret (to be honest)

50. ● A little dull to prepend / append ” ● Both of the original use-case and my case don't need this behavior

51. Plan to improve?

52. 1. Extend existing spec like str.undump(allow_no_quotes: true)

53. Too long!

54. 2. Introduce new method like str.just_unescape_backslashed_chars

55. Hard way to find good name...

56. So I created a (personal) gem

57. string_unescape https://github.com/tadd/string_unescape

58. if self[0] == '"' && self[-1] == '"’ self else ‘"’ + self + ‘”’ end.undump Definition

59. puts '/api/xe3x81x82'.unescape #=> /api/あ

60. Easy ?

61. Problems

62. ● The name may have arguments – Hard to merge into the core ● But just works?

63. ● From business knowledge, ● Found a potential and generic problem ● Implemented as (core / external) method Summary of What I did

64. Please make use ● String#undump (built-in) & ● String#unescape (string_unescape gem) more!!1

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