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PANGO_LIGATURE_HACK is defined as follows
It comprises a space-seperated list of elements. An
element can either be of the form :xx:zzzz, in which
case the first part is a language code and the second
is a name of another property to look in if the
language is matched.
or as follows
$AAAA=0000+007F-0915,0944
This defines a set, this will be visible to the entire font.
or of the form
xxxx[+xxxx[+xxxx...]]=yyyy[+yyyy]
xxxx can either be a hex glyph code which is matches directly,
or %AAAA, where it will match anything in the set.
yyyy is either a hex glyph code, or %n, in which case it refers
to the nth thing to have matched - e.g.
%FOO+2=2+%1, would swap instances of $FOO and 2.
(The language-specific stuff isn't implemented yet, but is parsed OK
and duly ignored here. This will be implemented soon)
Robert Brady <rwb197@zepler.org>, 2000-11-08
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