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Specify what constitutes a new-line #70

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tahonermann opened this issue Mar 23, 2021 · 4 comments
Open

Specify what constitutes a new-line #70

tahonermann opened this issue Mar 23, 2021 · 4 comments
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clarification Something isn't clear help wanted Extra attention is needed paper needed A paper proposing a specific solution is needed

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@tahonermann
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The C++ standard defines behavior that depends on the presence of a new-line, but does not define what characters or character sequences constitute a new-line. Uses of the "newline" and "new-line" terms appear in:

P2178 proposal 2 sought to clarify the set of characters and character sequences that constitute new-lines and proposed the following set. This set was derived from information in UAX #14.

  • U+000A: LINE FEED (LF)
  • U+000B: LINE TABULATION
  • U+000C: FORM FEED (FF)
  • U+000D: CARRIAGE RETURN (CR)
  • U+000D: CARRIAGE RETURN (CR) then U+000A: LINE FEED (LF)
  • U+0085: NEXT LINE (NEL)
  • U+2028: LINE SEPARATOR
  • U+2029: PARAGRAPH SEPARATOR

This set matches the guidance in Unicode 13, chapter 5.8, "Newline Guidelines".

When addressing this issue, we should settle on one of either "newline" or "new-line". The Unicode standard uses "newline". ISO 10646 only mentions newline in character names.
@tahonermann
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P2295 addresses this. The wording in revision 0 proposes the same set of characters as in P2178.

@tahonermann tahonermann added clarification Something isn't clear paper submitted A paper proposing a specific solution has been submitted labels Mar 23, 2021
@tahonermann
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The following CWG issues are relevant with regard to the form of a newline:

@tahonermann
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Later revisions of P2295 no longer address this.

@tahonermann tahonermann added help wanted Extra attention is needed paper needed A paper proposing a specific solution is needed and removed paper submitted A paper proposing a specific solution has been submitted labels Mar 28, 2021
@cor3ntin
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P2348 - of which an early draft is there https://isocpp.org/files/papers/D2348R0.pdf rewords the handling of whitspaces and new lines without extending the set

The following CWG issues are relevant with regard to the form of a newline:

I hope we can address all of these in P2348

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@cor3ntin @tahonermann