Mojca Miklavec wrote:
> On Mon, Oct 6, 2008 at 1:57 AM, Idris Samawi Hamid ادريس سماوي حامد wrote:
>> Dear gang,
>>
>> Sometimes I use the following for simple substitutions:
>>
>> \defineactivecharacter ' {\otfchar{quoteright}}
>>
>> But is there a more general mechanism to do things
>>
>> \definesubstitution{<string1>}{<string2>}
>>
>> eg
>>
>> \definesubstitution{--}{–}
>>
>> Of course ConTeXt already provides this particular substitution
>
> In mkii it doesn't. Fonts do that substitution. In mkiv a hack is
> applied to fonts (not to TeX macros), so that this particular
> substitution works.
>
>> but I'm
>> interested in such a mechanism for more general purposes.
>
> In mkii this is not possible, except with some ugly hacks. You can
> easily substitute a single character by making it active. To
> substitute whole words, you either need to modify fonts, or write some
> dirty macros.
>
> In mkiv you can either apply some "patches" to fonts (search for tlig
> in ConTeXt source, for example font-otf.lua, also, there are some fea
> files in fonts/fea/context capable of doing that), or change input
> text while reading/digesting some TeX file.
>
> Hans and Taco can probably tell you more.
it all depends on what we want to achieve ...
- we can have font fixers (dynamically extend fonts with features, but
this demands knowledge of the font)
- we can have replacements in the node list (attribute driven,
relatively easy to implement)
so before i start looking into this, we need to investigate what is
needed (and what for)
(only mkiv)
Hans
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