Am 06.01.2011 um 21:05 schrieb Paul Isambert:
> Le 06/01/2011 20:50, Philipp Stephani a écrit :
>> Am 06.01.2011 um 20:06 schrieb Luis Rivera:
>>
>>> "tables and functions". So how would you set a table for the six
>>> special characters of esperanto (^c, ^g, ^h, ^j, ^s, ^u)?
>> \catcode`\^=12
>> \begingroup
>> \catcode`\%=12
>> \gdef\percentchar{%}
>> \endgroup
>> \directlua{%
>> local translate = {
>> c = "ĉ",
>> g = "ĝ",
>> h = "ĥ",
>> j = "ĵ",
>> s = "ŝ",
>> u = "û"
>> }
>> function texperanto(text)
>> result = text:gsub("\percentchar^(\percentchar a)", translate)
>> tex.sprint(result)
>> end
>> }
>> \def\texperanto#1{\directlua{texperanto([[#1]])}}
>> \input luaotfload.sty
>> \font\rm={name:DejaVu Sans:}\relax
>> \rm
>> \texperanto{^a ^b ^c ^d ^e ^f ^g ^h ^i ^j ^s ^u}
>> \bye
>>
>
> A small simplification: again, the catcode change for "^" is unnecessary,
In this example it is necessary because otherwise you get errors (but only
because I used ^b and other unmodified sequences to test the functions)
> and you could as well use \direclua in the group and use "%" as is (i.e.
> without \percentchar), since \directlua is immune to TeX groups.
Indeed, I have forgotten that (the luacode environment does the same).
>
>
>>> I thought of a macro package independent solution. This one works for
>>> LuaLaTeX, but Patrick's should also work for plain LuaTeX.
>> of course that's possible, but a bit more awkward since you have to e.g.
>> escape percent characters. "macro package independence" is even harder with
>> LuaTeX than with pdfTeX, since you need lots of external packages to e.g.
>> load fonts. Luaotfload works with LaTeX and plain, but probably not with
>> ConTeXt, which is completely different anyway.
>
> Luaotfload should work with ConTeXt, since the code is ConTeXt's code. And
> format-independance should be enforced as often as possible (a personal
> hobby): when it comes to Lua, it's rather easy, since Lua code doesn't give a
> damn about formats (unless you use format-dependant Lua function, that is).
Maybe in this simple example, but in general I think it is quite hard (but I
have to admit that I've never written format-independent code).
>
>>> What occurs to me is to use a babel-like solution: make ^ active in
>>> textual context, and define it in terms of Lua functions so that it
>>> may check the following character and apply a conversion on a match:
>>> otherwise, typeset the original two character string.
>> Never do this if you have LuaTeX, it is completely obsolete and causes many
>> issues. If you are sure to run on LuaTeX, do everything in Lua, and avoid
>> catcode changes and the like.
>
> Indeed, the solution with catcodes would be ok with anything but LuaTeX, and
> you actually don't need any Lua function.
But making ^ active disables ^^-escapes:
\def\normalcircumflex{^}
\edef\twonormalcircumflexes{\normalcircumflex\normalcircumflex}
\catcode`\^=\active
\def^{\futurelet\next\dotexperanto}
\def\dotexperanto{%
\ifx\next g%
\let\next\dodotexperanto
\else
\ifx\next^%
\let\next\twonormalcircumflexes
\else
\let\next\normalcircumflex
\fi
\fi
\next
}
\def\dodotexperanto#1{\^#1}
g ^g h
^^J
\bye
