On 8/8/2016 5:24 PM, Mohammad Hossein Bateni wrote:
Thanks, Hans!
I see; this does work except for the trouble of annotating with \digits
macro. Would it be possible if I wrote a processor in Lua to do the work?
nodes.tasks.appendaction ("processors", "before", "fix_persian_mathperiod")
Can I find out if a node is inside math? If I look at the corresponding
font, how can I find out if this is a math font or not?
it's doable but then you also have to fight exceptions and that is no fun
I take it that in math fonts, kerning does not work, either? In my
case, the Persian decimal separator usually has a part below the
baseline that extends to the left, and because all (Persian) digits are
above the baseline, I get an ugly space in the middle. If kerning is
not possible at all, I can try to change the dimensions of Persian
decimal separator symbol because the kern is always necessary. Is it
possible to change the dimensions of the symbol or is that also fixed
and unchangeable?
probably best is to collect all that info, also for different math
fonts, and then cook up some virtual font support for it (across fonts),
if only because digits is one aspect if bidi math and there is more needed
Thanks a lot!
—MHB
On Mon, Aug 8, 2016 at 10:44 AM, Hans Hagen <pra...@wxs.nl
<mailto:pra...@wxs.nl>> wrote:
On 8/2/2016 9:54 PM, Mohammad Hossein Bateni wrote:
Could the problem be because math fonts use mode=base instead of
mode=node? Or is it because in math fonts, the digits and/or
full-stop
have different codes?
math fonts are defined and then don't change i.e. they are quite
static and all juggling with individual symbols of sequences is done
using predictable methods
—MHB
On Mon, Aug 1, 2016 at 9:46 AM, Mohammad Hossein Bateni
<bat...@gmail.com <mailto:bat...@gmail.com>
<mailto:bat...@gmail.com <mailto:bat...@gmail.com>>> wrote:
Dear list,
I want to add a customized font feature to the math font, to
automatically change the decimal point (unicode 0x2E) to the
Arabic/Farsi version (unicode 0x66B). This will go well
with the
mapping from Latin digits to Farsi digits (done in a sample with
mathdigits fallback).
For instance, I want to code in $123.45$ and get a result like
۱۲۳٫۴۵. However, I do not want to simply map 0x2E to 0x66B,
because
then "full stop" outside a number will also change. In
particular,
I'd like to have the mapping only when full-stop is preceded and
succeeded by a digit. This will, among other things, leave the
end-of-equation periods unchanged.
Here is how I tried to achieve it.
\startluacode
digits = { 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39 }
-- 0x66B instead of 0x2F gives an error!
replacements = { [0x002E] = { 0x2F } }
fonts.handlers.otf.addfeature {
name = "mpf",
type = "chainsubstitution",
lookups = { {
type = "multiple",
data = replacements,
} },
data = {
rules = {
{
current = { { 0x002E } },
after = { digits },
before = { digits },
lookups = { 1 },
}
}
}
}
\stopluacode
\definefontfeature[mathperiod][mpf=yes]
\resetfontfallback [mathdigits]
%\definefontfallback[mathdigits][dejavusansmono][digitsextendedarabicindic][check=yes,force=yes,offset=digitsnormal]
\definefontsynonym
[MathRoman][name:modern][features={math\mathsizesuffix,mathperiod},goodies=lm-math,fallbacks=mathdigits]
\starttext
$123.45.$
123.45.
\addff{mathperiod}
123.45.
\stoptext
Though this font feature works outside math, it does not seem to
have any effect within the math font. Why is that? Can we
add font
feature to the math font? Are the character codes different?
Notice that I could not get it to work, so I commented out the
fallback for Persian digits, to make things simpler. To get the
proof of concept, I am trying to change period to forward
slash (see
below).
Is the syntax I use for having two features in
\defontfontsynonym
correct? Actually, I did try with only mathperiod and it
does not
work, either.
When I change 0x2F (slash) to 0x066B in "replacements", I get an
error as follows.
fonts > otf chain > feature 'mpf', type
'gsub_contextchain', chain lookup 'mpf': rule 1 matches at char
U+0002E (period) for (1,1,1) chars, lookuptype 'gsub_multiple'
error:
...ext/tex/texmf-context/tex/context/base/mkiv/font-ots.lua:1232:
attempt to index field '?' (a nil value)
tex error > tex error on line 1 in file
/Users/bateni/farsitex/context/bostan/examples/mathfa/1.tex: ?
\page ->\par
\dosingleempty \page_breaks_process
\strc_pagenumbers_flush_final_page ...\else \page
[\p_strc_pagenumbers_page ...
\dostoptext ...\strc_pagenumbers_flush_final_page
\page \the
\everystoptext ...
l.1 \dostoptext
\clf_stoptext ->\luafunction \16>>clf_stoptext
l.46 \stoptext
Best,
MHB
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