From: Wolfgang Schuster <schuster.wolfgang@googlemail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Taco's \molecule fails in mkiv
Date: Tue, 24 Feb 2009 01:21:45 +0100 [thread overview]
Message-ID: <77829622-2E53-4057-930D-AB577FEC2AF1@gmail.com> (raw)
In-Reply-To: <6faad9f00902230914s502988d0pfc7cbc2f01ce570@mail.gmail.com>
[-- Attachment #1: molecule_lpeg.tex --]
[-- Type: application/octet-stream, Size: 2018 bytes --]
\startluacode
do
thirddata = thirddata or { }
local molecule = { }
function molecule.text(one)
tex.sprint(string.format("%s",one))
end
function molecule.low(one,two)
tex.sprint(string.format("%s\\low{%s}",one,two))
end
function molecule.high(one,two)
tex.sprint(string.format("%s\\high{%s}",one,two))
end
function molecule.lowhigh(one,two,three)
tex.sprint(string.format("%s\\lohi{%s}{%s}",one,two,three))
end
function molecule.highlow(one,two,three)
tex.sprint(string.format("%s\\lohi{%s}{%s}",one,two,three))
end
local plus = lpeg.P("+")
local minus = lpeg.P("-")
local lowercase = lpeg.R("az")
local uppercase = lpeg.R("AZ")
local number = lpeg.R("09")
local subscript = lpeg.P("_")
local superscript = lpeg.P("^")
local leftbrace = lpeg.P("{")
local rightbrace = lpeg.P("}")
local single = lowercase + number + plus + minus
local multiple = leftbrace * single^1 * rightbrace
local content = single + multiple
local text = lpeg.C(uppercase^1) / molecule.text
local low = lpeg.C(uppercase^1) * subscript * lpeg.C(content) / molecule.low
local high = lpeg.C(uppercase^1) * superscript * lpeg.C(content) / molecule.high
local lowhigh = lpeg.C(uppercase^1) * subscript * lpeg.C(content) * superscript * lpeg.C(content) / molecule.lowhigh
local highlow = lpeg.C(uppercase^1) * superscript * lpeg.C(content) * subscript * lpeg.C(content) / molecule.highlow
local parser = (lowhigh + highlow + low + high + text)^0
function thirddata.molecule(string)
parser:match(string)
end
end
\stopluacode
\def\molecule#1{\ctxlua{thirddata.molecule("#1")}}
\starttext
\molecule{CO_2}
\molecule{H^+}
\molecule{H_2^+}
\molecule{C_nH_{2n+1}OH}
\stoptext
[-- Attachment #2: Type: text/plain, Size: 478 bytes --]
Am 23.02.2009 um 18:14 schrieb Mojca Miklavec:
> thanks a lot for the very nice code :) :) :)
>
> The second example (H_2^+) does not return expected result - it
> should have been
> H\lohi{2}{+}
> instead, but I don't require such cases for the current document, so I
> guess that I'll just replace the old macro with this one for now in
> order not to get distracted with TeX problems too much :)
You can try the attatched, it use lpeg to parse the content.
Wolfgang
[-- Attachment #3: Type: text/plain, Size: 487 bytes --]
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next prev parent reply other threads:[~2009-02-24 0:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-23 16:21 Mojca Miklavec
2009-02-23 16:52 ` Wolfgang Schuster
2009-02-23 17:14 ` Mojca Miklavec
2009-02-24 0:21 ` Wolfgang Schuster [this message]
2009-02-23 18:19 ` luigi scarso
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