This is great. Thanks a lot, Hans! Documented on the wiki: https://wiki.contextgarden.net/Input_and_compilation/Languages/Right-to-left... I tested the idea with all context math fonts. TeX Gyre, DejaVu, Modern, STIX Two, Libertinus, XCharter, Kp Fonts, EB Garamond, Concrete, and Erewhon work with different fallback fonts I tried. On the other hand, I couldn't get Kurier and Plex to work (not important, just reporting). See note about Pennstander below. My typescript looks something like this: %%% beginning of demo %%% %%% some definitions for vazir, sahel and vazircode to set up rm, ss, mm %%% followed by the following for math % SEC A: fallback \starttypescript [math] [fall:vazir] [name] \definefontfallback [mathdig] [vazirregular] [digitsextendedarabicindic] [check=yes,force=yes,offset=digitsnormal] \definefontfallback [mathdig] [vazirbold] [digitsextendedarabicindic] [check=yes,force=yes,offset=digitsbold] % I use the following to remap some other characters like Arabic decimal separator, etc. \definefontfallback [mathdig] [vazirregular] [arabic] [check=yes,force=yes] \stoptypescript % SEC B: base \starttypescript [math] [main:modern] [name] \definefontsynonym[MathRoman] [file:latinmodern-math][features={math\mathsizesuffix,lm:mathextra,lm-math},goodies=modern-math,fallbacks=mathdig] \definefontsynonym[MathRomanBold][file:latinmodern-math][features={math\mathsizesuffix,lm:mathextra,lm-math-bold,lm-math},goodies=modern-math,fallbacks=mathdig] \stoptypescript % SEC C: combination \starttypescript [myfont] \definetypeface [\typescriptone][rm] [serif][sahel] [default] \definetypeface [\typescriptone][ss] [sans] [vazir] [default] \definetypeface [\typescriptone][tt] [mono] [vazircode][default] %\definetypeface [\typescriptone][mm] [math] [modern] [default] \definetypeface [\typescriptone][mm] [math] [fall:vazir,main:modern] [default] \stoptypescript %%% end of demo Still unresolved (less important mostly out of curiosity): 1. I'd have preferred something like "[math] [fall] [vazir] [default]" and "[math] [base] [modern] [default]" but couldn't get it to work. Is there any other way to make the above more readable? In my setup, I have copies of SEC A for each fallback font and a copy of SEC B for each base math font. 2. I don't understand how \definefontsynonym works. Does it have to be within a typescript? When (and how many times) are the definitions inside "executed"? 3. I couldn't get synonyms to work in the second argument of \definefontfallback. 4. Can we pass multiple fallbacks to \definefontsynonym definition like fallbacks={a,b}. I couldn't get this to work. 5. Can we do transitive definefontsynonyms and add features and fallback iteratively? I mean, define B from A with some features and fallbacks, and then C from B with some additional features and fallbacks. 6. I see that we have digitsnormal and digitsbold in the normal (non-bold) math font. Do we have the bold version of every character in there? 7. When I tried to apply fallback on Pennstander ( https://github.com/juliusross1/Pennstander) I discovered that the fallback does not take effect unless I add "presets.fallbacks {}," instead of the tweaks of the goodies file. 8. What is a "font class". I couldn't make much sense of the magical code for \definefontsynonym, etc. though something I found there was that there exists a class fallbacks and a (non-class?) fallback for each font. In the logs, I always saw the class one output as empty. --Mohammad On Wed, Feb 12, 2025 at 7:37 AM Hans Hagen via ntg-context < ntg-context@ntg.nl> wrote:
On 2/8/2025 3:05 PM, Mohammad Hossein Bateni wrote:
Hello,
I use fallbacks to substitute "Arabic" digits in math to Indic ones. The mechanism doesn't work in the newest context. I tried it with mkxl version in 2025.02.04 17:52 in a clean install. The email is a bit long, but please bear with me, so I can learn a few other things along the way.
\definefontfallback [Math] [dejavusansmono] [0x0660-0x0669] [check=yes,force=yes,offset=digitsnormal]
\setupbodyfont[dejavu,sans]
\starttext \startlines 1 : \im{3+2=5 \quad \bf 3+2=5} math with fallback 2 : {\bf \im{3+2=5 \quad \bf 3+2=5} bold math} 3 : {۳ + ۲ = ۵ \bf ۳ + ۲ = ۵ text Indic digits} 4 : {3 + 2 = 5 \bf 3 + 2 = 5 text Arabic diigts} 5 : \dm{\sum_{i=1}^{8} x^2 = \pi\alpha + e^{-\beta}} \stoplines \stoptext
%$$\sum_{i=1}^{8} x^2 = \pi\alpha + e^{-\beta}$$
If the last line is uncommented, I ran into the following error.
In ConTeXt the $$ is just seen as $ (inline math).
Hans
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