From: Hans Aberg <haberg-1@telia.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Math literal colon
Date: Fri, 24 Jul 2015 14:40:49 +0200 [thread overview]
Message-ID: <488207D2-1B5D-4623-8761-BEAFFF57D3CD@telia.com> (raw)
In-Reply-To: <55B207F4.9070505@wxs.nl>
> On 24 Jul 2015, at 11:40, Hans Hagen <pragma@wxs.nl> wrote:
>
> On 7/20/2015 6:09 PM, Hans Aberg wrote:
>>
>>> On 20 Jul 2015, at 17:50, Manuel Blanco <manuelbl@ucm.es> wrote:
>>>
>>> A little bit more of intelligence can be given with
>>>
>>> \begingroup\lccode`\~=`\:\lowercase{\endgroup
>>> \unexpanded\def~}{\futurelet\tmptoken\docolon}
>>> \unexpanded\def\docolon{\ifx=\tmptoken\mathrel{\mathop{\mathchar`\:}}\else\colon\fi}
>>> \mathcode`\:="8000 %
>>>
>>> That lets you do $f: A \to B$ and $f(x) := x^2$
>>
>> For the second, one can use ≔ COLON EQUALS U+2254. But it is a good point, though.
>
> there is actually a more modern trick:
>
> \starttext
>
> \startluacode
> characters.mathpairs[0x3A] = { [0x3D] = 0x2254 }
> characters.mathpairs[0x3E] = { [0x3D] = 0x2265 }
> characters.mathpairs[0x3C] = { [0x3D] = 0x2264 }
> characters.mathpairs[0x3D] = { [0x3A] = 0x2255 }
> \stopluacode
>
> \startTEXpage
> $a := b <= =< c =: d >= e$
> \stopTEXpage
>
> \stoptext
I have experimented with a theorem proof assistant that admitted parallel ASCII and Unicode symbol names, but it turns out to be complicated. Think of C/C++ trigraphs, a chore to implement, only to be removed in the latest standards.
So I think one should only focus on UTF-8, and add TeX ASCII “\” commands as a complement.
One problem with this approach is the lack of Unicode input methods. But that may coming.
For example, instead having “:=“ in the input file and let Lua translate it, one can merely type it and let the text editor translate it ≔ COLON EQUALS U+2254.
It will save a lot of programming time, at least on the ConTEXt project. :-)
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next prev parent reply other threads:[~2015-07-24 12:40 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-20 12:30 Hans Aberg
2015-07-20 14:40 ` Aditya Mahajan
2015-07-20 15:43 ` Manuel Blanco
2015-07-20 15:50 ` Manuel Blanco
2015-07-20 16:09 ` Hans Aberg
2015-07-24 9:40 ` Hans Hagen
2015-07-24 12:40 ` Hans Aberg [this message]
2015-07-24 13:34 ` Hans Hagen
2015-07-24 14:13 ` Hans Aberg
2015-07-24 14:28 ` Hans Hagen
2015-07-24 16:18 ` Hans Aberg
2015-07-24 16:34 ` Hans Hagen
2015-07-24 16:57 ` Hans Aberg
2015-07-24 19:58 ` Hans Hagen
2015-07-24 20:45 ` Hans Aberg
2015-07-20 16:22 ` Hans Aberg
2015-07-20 19:34 ` Manuel Blanco
2015-07-20 20:06 ` Hans Aberg
2015-07-20 20:13 ` Hans Aberg
2015-07-24 9:43 ` Hans Hagen
2015-07-24 13:00 ` Hans Aberg
2015-07-24 13:48 ` Hans Hagen
2015-07-24 14:19 ` Hans Aberg
2015-07-24 14:29 ` Hans Hagen
2015-07-24 16:20 ` Hans Aberg
2015-07-20 16:06 ` Hans Aberg
2015-07-20 16:37 ` Aditya Mahajan
2015-07-20 17:08 ` Hans Aberg
2015-07-20 17:18 ` Hans Aberg
2015-07-20 21:29 ` Hans Aberg
2015-07-24 8:30 ` Hans Hagen
2015-07-24 12:32 ` Hans Aberg
2015-07-24 13:29 ` Hans Hagen
2015-07-24 14:08 ` Hans Aberg
2015-07-24 14:26 ` Hans Hagen
2015-07-24 16:11 ` Hans Aberg
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