On 1/6/2016 5:28 PM, Paolo Brasolin wrote:
Hello.
I am trying to add some custom ligatures to a font using a feature file.
Everything works just fine, until I try what is called a chained
contextual substitution, i.e. a GSUB lookup of type 6.
I am studying the specs from
http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html#5.f
A simple example.fea that does not work for me is:
languagesystem dflt dflt;
lookup FOOBAR {
sub B by Q ;
} FOOBAR;
feature foba {
sub [A] B' lookup FOOBAR;
} foba ;
I'd expect it to replace B with Q only when preceeded by A.
The same rule expressed with a lookup of type 8 works just fine:
languagesystem dflt dflt;
feature foba {
sub [A] B' by Q;
} foba ;
Ultimately I would need to use multiple inline lookups, something like
sub [A]' B' lookup FOO C' lookup BAR;
Are inline lookups unsupported by the engine?
That would seem strange to me.
I'm probably missing some point, but I'm unable to find more documentation.
Am I using the wrong syntax?
the new font loaders doesn't support fea files (i have a basic parser
but it's not included as i'm still not sure if it should be .. fea files
assume stable fonts and so)
\usemodule[oldotf]
might work ok for you
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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