Re: Python filter: incomplete triple-quoted string support

[Thomas Dickey]

On Tue, Feb 04, 2020 at 08:55:55PM -0800, Marc Simpson wrote:
> The current filter (py-filt.l) only supports triple-quoted strings
> formed with double quotes; single quote multi-line literals are
> incorrectly highlighted, e.g.

hmm - I overlooked that (when I wrote it in 1999).
 
>     '''
>     'foo'
>     bar
>     '''
> 
> Naive patch: declare QUOTE4, duplicate and adapt the existing QUOTE3
> block:
> 
>     %s NORMAL QUOTE1 QUOTE2 QUOTE3 QUOTE4
> 
>     ...
> 
>     <NORMAL>\'\'\'  { BeginQuote(QUOTE4, String_attr); }
>     <QUOTE4>\'\'\'  { FinishQuote(NORMAL); }
>     <QUOTE4>(\\.|.) { flt_bfr_append(yytext, yyleng); }
>     <QUOTE4>[\n]    { flt_bfr_append(yytext, yyleng); }
> 
> (This can surely be simplified.)

Only a little.

The last two lines can be combined with the similar QUOTE3 ones,
like this:

      <QUOTE3,QUOTE4>(\\.|.) { flt_bfr_append(yytext, yyleng); }
      <QUOTE3,QUOTE4>[\n]    { flt_bfr_append(yytext, yyleng); }

lex doesn't have macros, or something analogous, so the other two
lines in each chunk can't be merged.

-- 
Thomas E. Dickey <address@hidden>
https://invisible-island.net
ftp://ftp.invisible-island.net

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