## LATEX-L@LISTSERV.UNI-HEIDELBERG.DE

 Options: Use Classic View Use Monospaced Font Show Text Part by Default Condense Mail Headers Topic: [<< First] [< Prev] [Next >] [Last >>]

 Sender: Mailing list for the LaTeX3 project <[log in to unmask]> Date: Fri, 8 Jul 2016 19:46:57 +0100 Reply-To: Mailing list for the LaTeX3 project <[log in to unmask]> Message-ID: <[log in to unmask]> Subject: Re: \parshape and bidi MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In-Reply-To: <[log in to unmask]> Content-Type: text/plain; charset="windows-1252"; format=flowed From: David Carlisle <[log in to unmask]> Parts/Attachments: text/plain (112 lines) On 08/07/2016 18:32, Javier Bezos wrote: > I'm working on basic support (very basic) for bidi text and > I'm facing a problem with \list because it relies on \parshape. > I copy a message I sent to the luatex list: > > ----------------------------- > Well, after thinking a little more about this I'm not so > sure. The problem is \parshape is used for two different > purposes: (a) fancy paragraphs (a heart, the map of The > Netherlands, wrapping some text around a figure, etc.); > (b) an alternative to \left/rightskip and \parindent. > While mirroring the latter makes sense, mirroring > The Netherlands seems a bit odd. I wonder if an > alternative could be \parshape dir XXX, like boxes. > ---------------------------- > > I'd like not to touch the core at all (until now I've > managed to do it), and on the other hand many packages > emulate what LaTeX does. Suggestions? > > Javier > For context, that was dev-luatex list not the main luatex list at tug https://mailman.ntg.nl/pipermail/dev-luatex/2016-July/005769.html I'd have thought that your example isn't convincing, and that parshape should always follow the writing direction. Even if the shape is a map of the Netherlands if writing left to right or right to left, specifying a sequence of starting points and line lengths would seem reasonable, although of course the actual numbers would be different depending on whether you are specifying offsets from the left or right. even if luatex's primitive \parshape doesn't get a flag, you could define it in lua, I put at the end an \xparshape that uses indents from the other side (if I got it right) with a bit more care you could overload both definitions onto the \parshape csname and query internally the current direction to use whichever form you need. It should also print using a fixed catcode, but not this evening:-) Actually it could probably set the paragraph shape from lua rather than writing out a tex \parshape, I'd need to check... David David \parindent=0pt \hsize 11cm %\outputmode=1 % No difference with 0 \let\oldparshape\parshape \def\xparshape{\directlua{% local n = token.scan_int() print('\string\nn: ' .. n) local lngth = {} local indx = {} for i = 1,n do indx[i]=token.scan_dimen() lngth[i]=token.scan_dimen() end tex.print('\string\\oldparshape ') tex.print( n .. ' ') for i = 1,n do tex.print((tex.hsize - lngth[i] - indx[i]) .. 'sp ') tex.print(lngth[i] .. 'sp ') end }} 00Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. {\leftskip1cm LLLLorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat.\par} {\parshape 2 0cm 10cm 1cm 10cm PPPLorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat.\par} {\xparshape 2 0cm 10cm 1cm 10cm XXXLorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat.\par} \bye ________________________________ The Numerical Algorithms Group Ltd is a company registered in England and Wales with company number 1249803. The registered office is: Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom. This e-mail has been scanned for all viruses by Microsoft Office 365. ________________________________