new trickery

[Hans Hagen <pragma@wxs.nl>]

Hi,

There is a new experimental feature and (at least for now) it's also 
called \feature (maybe not the best name).

Many fonts have language dependent features. There are also features 
that one only wants to enable in small text snippets. For this we have 
\addff etc but these don't accumulate. The next example demonstrates an 
accumulator.

\setupbodyfont[pagella]

\starttext

% When the (again experimental) setup for 'font' is used, the
% features will also adapt themselves to the language. I'm
% still considering on how to deal with the main language.

% \definefontfeature[nl][language=nld,script=latn]
\setuplanguages[font=auto]
% \setuplanguage [default][font=auto]
% \setuplanguage [nl][font=auto]

% We need to make a nice set of 'simple' switchers.

\definefontfeature[f:smallcaps][smcp=yes]
\definefontfeature[f:nocaps]   [smcp=no]
\definefontfeature[f:oldstyle] [onum=yes]
\definefontfeature[f:newstyle] [onum=no]

% watch how features accumulate

\startTEXpage[offset=10pt]
     fijn fietsen 123
     \feature{f:oldstyle}
     fijn fietsen 123
     \feature{f:smallcaps}
     fijn fietsen 123
     \feature{f:oldstyle}
     fijn fietsen 123
     \start
     \nl % \feature{nl}
     fijn fietsen 123
     \de
     fijn fietsen 123
     \stop
     fijn fietsen 123
     \feature{f:newstyle}
     fijn fietsen 123
     \feature{f:nocaps}
     fijn fietsen 123
\stopTEXpage

% watch how lm has contextual lookups for ligatures
% that depend on the language

\startTEXpage[offset=10pt]
     \definedfont[lmroman10-regular*default]
     fijn fietsen
     \nl
     fijn fietsen
     \de
     fijn fietsen
\stopTEXpage

\stoptext

This mechanism is (just as \addff cum suis) somewhat slower but as long 
as it's used grouped, performance is quite ok.

Hans


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
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