Hagen - Pragma ADE

mkiv lua stats > loaded fonts: 2 files: latinmodern-math.otf (experimental), lmroman12-regular.otf
The ignored flag signals the font name database builder to ignore the file. This means
that the font can still be known as file, but that its (name based) properties are not
collected. As you asked explicitly for a file, the file can still be loaded. You can use this
trick to avoid issues with the database builder in case of a problematic file, but a real
run will still try to load the file. After all, you get what you ask for. If loading and usage
is successful you get at least the message reported at the end of the run.
5.5 Analyzers
An OpenType font is kind of special in the sense that it provides some information on how
to turn sequences of characters into sequences of glyphs. In fact, if all fonts had a reasonable
repertoire of glyphs most of the information that concerns combining, remapping
and shuffling the input and/or mapping onto glyphs could as well happen in the
renderer. This means that fonts have many of their internal features tables in common,
or more precisely could share many gsub related issues, if only there had been some
predefined sets of substitutional features.
So, for most of the time, a feature processor just does what the font demands and the
font provides the information. There are however a few cases where font only provide
part of the logic. Take for instance the init, medi, fina and isol features that relate to
positions in the word: the start, the end, in the middle or isolated. For these features to
work the engine has to provide information about the state of a character (glyph) and
this is where analysis kicks in. Just watch this:
\definefontfeature
[default-with-analyze]
[default]
[script=latn,mode=node,
init=yes,medi=yes,fina=yes,isol=yes]
\showotfcomposition
{dejavu-serif*default-with-analyze at 24pt}
{}
{I don't wanna know tha\utfchar{"300}t!}
In the tracer the different categories are colored. This kind of information is especially
important for typesetting Arabic. Normally ConT E Xt can figure out itself when this
is needed so you don’t have to worry too much about this kind of additional actions.
font 86: DejaVuSerif.ttf @ 24.0pt
features analyze=yes, curs=yes, devanagari=yes, extrafeatures=yes,
fina=yes, init=yes, isol=yes, kern=yes, liga=yes, mark=yes,
medi=yes, mkmk=yes, mode=node, script=latn, tlig=yes, trep=yes
97
Features