[bug #60955] [troff] reject "f" scaling indicator in unreasonable contexts

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?60955>

                 Summary: [troff] reject "f" scaling indicator in unreasonable
contexts
                 Project: GNU troff
            Submitted by: gbranden
            Submitted on: Wed 21 Jul 2021 08:14:59 PM UTC
                Category: Core
                Severity: 1 - Wish
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

The "f" scale unit (thanks to Ingo Schwarze for this new terminology) is
applied only to dimensionless quantities (the intensity of a luma or chroma
channel in a color space), and is itself dimensionless.

While it's _possible_ for people to use "f" with a length measurement, it's
likely not done seriously in practice except in error.

See how easy it would be to get src/roff/troff/number.cpp:552-581 to handle
this.

It would also be good to reject the complementary form of nonsense.


.defcolor green rgb 2i 5c 3p


A type system was lying right there the whole time... :-/




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