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<title>LGR Transcription to Greek LICR transformation</title>
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<h1 class="title">LGR Transcription to Greek LICR transformation</h1>
<dl class="docinfo simple">
<dt class="copyright">Copyright</dt>
<dd class="copyright">© 2010 Günter Milde</dd>
<dt>Licence</dt>
<dd><p>This work may be distributed and/or modified under the
conditions of the <a class="reference external" href="http://www.latex-project.org/lppl.txt">LaTeX Project Public License</a>, either
version 1.3 of this license or any later version.</p>
</dd>
</dl>
<!-- #!/usr/bin/env lua -->
<p>The LGR font encoding is the de-facto standard for Greek typesetting with
LaTeX. This file provides a translation from the Latin transcription defined
by LGR into the LaTeX Internal Character Representation (LICR) macros.</p>
<pre class="literal-block">usage = [[
Usage: lua lgr2licr.lua [OPTIONS] [STRING]
Convert STRING from Latin transcription to LICR macros for Greek symbols.
(This dumb conversion fails if the string contains TeX macros.)
Without argument, the script reads from standard input like a
redirected file. End interactive input with Ctrl-D.
Options: -h, --help show this help
-f, --file read input from file STRING
]]
if arg[1] == "-h" or arg[1] == "--help" then
print(usage)
return
end
</pre>
<p>Get input string:</p>
<pre class="literal-block">local s
if arg[1] == "-f" then
local f = assert(io.open(arg[2], "r"))
s = f:read("*all")
f:close()
elseif arg[1] then
s = table.concat(arg, " ") .. "\n"
else
-- test:
-- s = "\\emph{x\\'us}"
s = io.read("*all")
end
</pre>
<p>The mapping from the LGR Latin transcription to LICR macros:</p>
<pre class="literal-block">LGR_map = {
A = "\\textAlpha{}",
B = "\\textBeta{}",
G = "\\textGamma{}",
D = "\\textDelta{}",
E = "\\textEpsilon{}",
Z = "\\textZeta{}",
H = "\\textEta{}",
J = "\\textTheta{}",
I = "\\textIota{}",
K = "\\textKappa{}",
L = "\\textLambda{}",
M = "\\textMu{}",
N = "\\textNu{}",
X = "\\textXi{}",
O = "\\textOmicron{}",
P = "\\textPi{}",
R = "\\textRho{}",
S = "\\textSigma{}",
T = "\\textTau{}",
U = "\\textUpsilon{}",
F = "\\textPhi{}",
Q = "\\textChi{}",
Y = "\\textPsi{}",
W = "\\textOmega{}",
a = "\\textalpha{}",
b = "\\textbeta{}",
g = "\\textgamma{}",
d = "\\textdelta{}",
e = "\\textepsilon{}",
z = "\\textzeta{}",
h = "\\texteta{}",
j = "\\texttheta{}",
i = "\\textiota{}",
k = "\\textkappa{}",
l = "\\textlambda{}",
m = "\\textmu{}",
n = "\\textnu{}",
x = "\\textxi{}",
o = "\\textomicron{}",
p = "\\textpi{}",
r = "\\textrho{}",
s = "\\textautosigma{}",
c = "\\textfinalsigma{}",
t = "\\texttau{}",
u = "\\textupsilon{}",
f = "\\textphi{}",
q = "\\textchi{}",
y = "\\textpsi{}",
w = "\\textomega{}",
v = "\\noboundary{}",
["'"] = "\\'",
["`"] = "\\`",
["~"] = "\\~",
["<"] = "\\<",
[">"] = "\\>",
["|"] = "\\|",
['"'] = '\\"',
[";"] = "\\textanoteleia{}",
["?"] = "\\texterotimatiko{}",
}
</pre>
<p>Return substitution string for 3 captures:</p>
<p><cite>c1</cite> backslash
<cite>c2</cite> a-zA-Z
<cite>c3</cite> any other char</p>
<pre class="literal-block">function lgr_replace(c1, c2, c3)
-- print (c1, c2, c3)
if c1 == "\\" then
if c2 and (c2 ~= "") then
return c1 .. c2 .. (LGR_map[c3] or c3 or "")
end
return c1 .. c3
end
c2 = string.gsub(c2, "s(.)", "sv%1")
return (string.gsub(c2, ".", LGR_map) or "") .. (LGR_map[c3] or c3 or "")
end
-- Use the mapping to replace every ASCII-character with
-- non-standard meaning to the corresponding LICR macro
-- (skip macros)::
-- *([a-zA-Z'`~<>|\";?]
s = string.gsub(s, "(\\?)([a-zA-Z]*)([^\\]?)", lgr_replace)
</pre>
<p>Ligatures:</p>
<pre class="literal-block">s = string.gsub(s, "%(%(", "\\guillemotleft{}")
s = string.gsub(s, "%)%)", "\\guillemotright{}")
s = string.gsub(s, "\\'\\'", "\\textquoteright{}") -- ''
s = string.gsub(s, "\\`\\`", "\\textquoteleft{}") -- ``
s = string.gsub(s, '\"(%s)', "\\textquoteright{}%1")
</pre>
<p>Separating empty group “{}” only required if followed by space or ASCII:</p>
<pre class="literal-block">s = string.gsub(s, "{}([^ a-zA-Z])", "%1")
</pre>
<p>Autosigma replacements:</p>
<pre class="literal-block">s = string.gsub(s, "\\textautosigma\\noboundary", "\\textsigma") -- sv
s = string.gsub(s, "\\textautosigma(\\['`~<>|\"])", "\\textsigma%1") -- accents
s = string.gsub(s, "\\textautosigma([-%s!#$%%&%(%)*+,./0-9:=%[%]{|}])",
"\\textfinalsigma%1")
s = string.gsub(s, "\\textautosigma(\\textquote)", "\\textfinalsigma%1")
s = string.gsub(s, "\\textautosigma(\\texterotimatiko)", "\\textfinalsigma%1")
s = string.gsub(s, "\\textautosigma(\\textanoteleia)", "\\textfinalsigma%1")
s = string.gsub(s, "\\textautosigma$", "\\textfinalsigma")
</pre>
<p>Write the result to stdout:</p>
<pre class="literal-block">io.write(s)
</pre>
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