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Re: Shortcut for \repeat unfold

From: Hans Åberg
Subject: Re: Shortcut for \repeat unfold
Date: Sun, 26 Sep 2021 09:57:29 +0200

> On 26 Sep 2021, at 06:49, Werner LEMBERG <> wrote:
>>>> The idea here is different, it is for identifiers, and in the
>>>> input syntax only, does not change the internal semantics at all.
>>>> It is good not having to type backslash when a command is used.
>>> Really?  I highly doubt that.  In particular, what about lyrics
>>> mode?
>> The idea would be to change the file lexer.ll by adding U and
>> A            [a-zA-Z\200-\377]
>> U            [\200-\377]
>> AA           {A}|_
>> N            [0-9]
>> ANY_CHAR     (.|\n)
>> SYMBOL       {A}([-_]{A}|{A})*
>> COMMAND      \\{SYMBOL}
>> Then in select places, that is context switches, add {UCOMMAND}:
>>      {COMMAND}       {
>>              return scan_escaped_word (YYText_utf8 () + 1);
>>      }
>>      {UCOMMAND}      {
>>              return scan_escaped_word (YYText_utf8 ());
>>      }
> You might provide a MR, maybe it gets accepted.  I still doubt that it
> would be a good idea.

There is a conflict in some contexts between {SYMBOL} and {COMMAND}, so may not 
work. To get a regular COMMAND syntax, they should start with something that 
SYMBOL does not.

Otherwise you might replace the function YYText_utf8 with proper UTF-8 
patterns, a variation of:

/* UTF-8 character with valid Unicode code point. */

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