Update of bug #64484 (group groff):
Summary: [troff] .device and \X don't behave the same =>
[troff] \X escape sequence should read its argument in copy mode
_______________________________________________________
Follow-up Comment #12:
[comment #11 comment #11:]
> Postponing; I don't have hope of getting this sorted out in time for _groff_
1.24.
But there's some good news.
> Two differences between the `device` request and `\X` escape sequence
concern me and, at the very least, should be documented.
>
> 1. `device` reads its argument in copy mode; `\X` doesn't.
This is documented.
The 'device' request processes its arguments in copy mode (*note
Copy Mode::). An initial neutral double quote in CONTENTS is
stripped to allow embedding of leading spaces. By contrast, within
'\X' arguments, the escape sequences '\&', '\)', '\%', and '\:' are
ignored; '\<SPC>' and '\~' are converted to single space
characters; and a self-escaped escape character is output as a
backslash '\'. So that the basic Latin subset of the Unicode
character set(2) (*note Postprocessor Access-Footnote-2::) can be
reliably encoded in device control commands, seven special
character escape sequences ('\-', '\[aq]', '\[dq]', '\[ga]',
'\[ha]', '\[rs]', and '\[ti]') are mapped to basic Latin
characters; see the 'groff_char(7)' man page. For this
transformation, character translations and special character
definitions are ignored.(3) (*note Postprocessor
Access-Footnote-3::) The use of any other escape sequence in '\X'
parameters is normally an error.
> 2. `\X` is accepted, and works, at the beginning of input; `device` does
not.
This was bug #65977 and is now fixed.
Retitling. GNU _troff_ at present has no mechanism enabling _any_ delimited
escape sequence to read its arguments in copy mode (`\?` does, but uniquely
uses itself as a "delimiter".) So this remains postponed past 1.24.
_______________________________________________________
Reply to this item at:
<https://savannah.gnu.org/bugs/?64484>
_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/
signature.asc
Description: PGP signature
