[NTG-context] Unicode mathematics in ConTeXt

Hamid,Idris Idris.Hamid at ColoState.EDU
Sat May 4 13:35:41 CEST 2019


On Sat, 04 May 2019 04:32:19 -0600, Wolfgang Schuster
<wolfgang.schuster.lists at gmail.com> wrote:

> Hi Idris,
>
> please read this: https://www.w3.org/TR/unicode-xml/#Superscripts

Many thanks. The issue is clearer now, e.g.,

=======
When used in mathematical context (MathML) it is recommended to
consistently use style markup for superscripts and subscripts. This is
because mathematical layout allows not just individual symbols, but entire
expressions to be superscripted or subscripted in a regular, nested manner.
=======

Of course, consistent use of style markup means that we can't naively
extract superscript text from the pdf, e.g., \CATCA becomes ๐“’nt.

OTOH, issues 4.i and 4.ii below are still perplexing. Are there any
workarounds?

Thanks again.

Best wishes
Idris

> Hamid,Idris schrieb am 03.05.2019 um 21:40:
>> Dear gang,
>>
>> Ok, I've made some progress:
>>
>> 1. tex-gyre etc. *do* support Unicode mathematics, but the version of
>> ConTeXt I was using had produced the wrong encoding in the pdf output.  
>> For
>> example, U+1D4D2 (๐“’) in the input was being mapped to U+2D4D2 in the
>> output.
>>
>> Updating to the latest beta appears to have fixed this issue.
>>
>> 2. tex-gyre etc. appears to be missing some superscript characters,  
>> e.g.,
>> โฟ (U+207F).
>>
>> 3. New example:
>>
>> =======
>> \setupbodyfont
>>     [cambria,12pt]
>>     % [pagella,12pt]
>>     % [times,12pt]
>>
>> % \starttext
>> \startTEXpage
>> \def\ANTI{{^{\rm nt}}}
>> \def\ANTIU{{^{\rm โฟแต—}}}
>>
>> \def\CATCA{$\cal \bf C\ANTI$}
>> \def\CATCAU{$๐“’\ANTIU$}
>>
>> ๐“’ \CATCA \CATCAU
>> \stopTEXpage
>> % \stoptext
>> =======
>>
>> \CATCAU and \ANTIU use Unicode characters and superscripts directly,
>> instead of the old TeX method.
>>
>> 4. Issues. In the pdf output of \CATCAU:
>> i)   Why does ConTeXt make the second superscript larger than the first?
>> ii)  If one copies the text of the pdf output to an editor - even this
>> email client - the second superscript moves to a new line:
>>
>> ๐“’ โฟ
>> t
>>
>> Why does this happen? Is this a bug?
>>
>> 5. Here is what we want: ๐“’ โฟแต—
>>
>> What is the proper or best way to get a character-superscript  
>> combination
>> in ConTeXt whose output can be copied and pasted to an editor and give  
>> the
>> correct result? What am I missing?
>>
>> Thank you in advance.
>>
>> Best wishes
>> Idris
>>
>> On Wed, 01 May 2019 14:58:06 -0600, Hamid,Idris
>> <Idris.Hamid at colostate.edu> wrote:
>>
>>> Dear gang,
>>>
>>> I need to convert a document from TeX-style to Unicode mathematics. For
>>> example:
>>>
>>> \starttext
>>> \def\ANTI{{^{\rm nt}}}
>>> \def\CATCA{$\cal \bf C\ANTI$}
>>>
>>> \CATCA
>>> \stoptext
>>>
>>> Issues:
>>>
>>> 1. I need calligraphic characters, but the relevant characters in
>>> latinmodern-math.otf are not encoded in (standard) Unicode. The same  
>>> goes
>>> for the tex-gyre-math fonts.
>>>
>>> 2. What comprehensive unicode-math fonts do you recommend as an
>>> alternative?
>>>
>>> 3. In the above example, \cal is used.
>>>
>>> 4. Other issues may arise, e.g., getting subscripts and superscripts
>>> correct. How might one rewrite the above with Unicode mathematics in
>>> mind?
>>> Is there a My Way or some other guide to Unicode mathematics in  
>>> ConTeXt?
>>>
>>> This writer has never had to think about this matter before so this is
>>> all
>>> new ground to learn. Thank you in advance for any guidance.
>>>
>>> Best wishes
>>> Idris
-- 
Idris Samawi Hamid, Professor
Department of Philosophy
Colorado State University
Fort Collins, CO 80512


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