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<h1 class="title">LGR Transcription to Greek LICR transformation</h1>
<dl class="docinfo simple">
<dt class="copyright">Copyright<span class="colon">:</span></dt>
<dd class="copyright">© 2010 Günter Milde</dd>
<dt class="licence">Licence<span class="colon">:</span></dt>
<dd class="licence"><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] == &quot;-h&quot; or arg[1] == &quot;--help&quot; then
    print(usage)
    return
end</pre>
<p>Get input string:</p>
<pre class="literal-block">local s

if arg[1] == &quot;-f&quot; then
    local f = assert(io.open(arg[2], &quot;r&quot;))
    s = f:read(&quot;*all&quot;)
    f:close()
elseif arg[1] then
    s = table.concat(arg, &quot; &quot;) .. &quot;\n&quot;
else
    -- test:
    -- s = &quot;\\emph{x\\'us}&quot;
    s = io.read(&quot;*all&quot;)
end</pre>
<p>The mapping from the LGR Latin transcription to LICR macros:</p>
<pre class="literal-block">LGR_map = {
  A = &quot;\\textAlpha{}&quot;,
  B = &quot;\\textBeta{}&quot;,
  G = &quot;\\textGamma{}&quot;,
  D = &quot;\\textDelta{}&quot;,
  E = &quot;\\textEpsilon{}&quot;,
  Z = &quot;\\textZeta{}&quot;,
  H = &quot;\\textEta{}&quot;,
  J = &quot;\\textTheta{}&quot;,
  I = &quot;\\textIota{}&quot;,
  K = &quot;\\textKappa{}&quot;,
  L = &quot;\\textLambda{}&quot;,
  M = &quot;\\textMu{}&quot;,
  N = &quot;\\textNu{}&quot;,
  X = &quot;\\textXi{}&quot;,
  O = &quot;\\textOmicron{}&quot;,
  P = &quot;\\textPi{}&quot;,
  R = &quot;\\textRho{}&quot;,
  S = &quot;\\textSigma{}&quot;,
  T = &quot;\\textTau{}&quot;,
  U = &quot;\\textUpsilon{}&quot;,
  F = &quot;\\textPhi{}&quot;,
  Q = &quot;\\textChi{}&quot;,
  Y = &quot;\\textPsi{}&quot;,
  W = &quot;\\textOmega{}&quot;,

  a = &quot;\\textalpha{}&quot;,
  b = &quot;\\textbeta{}&quot;,
  g = &quot;\\textgamma{}&quot;,
  d = &quot;\\textdelta{}&quot;,
  e = &quot;\\textepsilon{}&quot;,
  z = &quot;\\textzeta{}&quot;,
  h = &quot;\\texteta{}&quot;,
  j = &quot;\\texttheta{}&quot;,
  i = &quot;\\textiota{}&quot;,
  k = &quot;\\textkappa{}&quot;,
  l = &quot;\\textlambda{}&quot;,
  m = &quot;\\textmu{}&quot;,
  n = &quot;\\textnu{}&quot;,
  x = &quot;\\textxi{}&quot;,
  o = &quot;\\textomicron{}&quot;,
  p = &quot;\\textpi{}&quot;,
  r = &quot;\\textrho{}&quot;,
  s = &quot;\\textautosigma{}&quot;,
  c = &quot;\\textfinalsigma{}&quot;,
  t = &quot;\\texttau{}&quot;,
  u = &quot;\\textupsilon{}&quot;,
  f = &quot;\\textphi{}&quot;,
  q = &quot;\\textchi{}&quot;,
  y = &quot;\\textpsi{}&quot;,
  w = &quot;\\textomega{}&quot;,
  v = &quot;\\noboundary{}&quot;,

  [&quot;'&quot;] = &quot;\\'&quot;,
  [&quot;`&quot;] = &quot;\\`&quot;,
  [&quot;~&quot;] = &quot;\\~&quot;,
  [&quot;&lt;&quot;] = &quot;\\&lt;&quot;,
  [&quot;&gt;&quot;] = &quot;\\&gt;&quot;,
  [&quot;|&quot;] = &quot;\\|&quot;,
  ['&quot;'] = '\\&quot;',
  [&quot;;&quot;] = &quot;\\textanoteleia{}&quot;,
  [&quot;?&quot;] = &quot;\\texterotimatiko{}&quot;,
}</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 == &quot;\\&quot; then
        if c2 and (c2 ~= &quot;&quot;) then
            return c1 .. c2 .. (LGR_map[c3] or c3 or &quot;&quot;)
        end
        return c1 .. c3
    end
    c2 = string.gsub(c2, &quot;s(.)&quot;, &quot;sv%1&quot;)
    return (string.gsub(c2, &quot;.&quot;, LGR_map) or &quot;&quot;) .. (LGR_map[c3] or c3 or &quot;&quot;)
end

-- Use the mapping to replace every ASCII-character with
-- non-standard meaning to the corresponding LICR macro
-- (skip macros)::
  -- *([a-zA-Z'`~&lt;&gt;|\&quot;;?]
s = string.gsub(s, &quot;(\\?)([a-zA-Z]*)([^\\]?)&quot;, lgr_replace)</pre>
<p>Ligatures:</p>
<pre class="literal-block">s = string.gsub(s, &quot;%(%(&quot;, &quot;\\guillemetleft{}&quot;)
s = string.gsub(s, &quot;%)%)&quot;, &quot;\\guillemetright{}&quot;)
s = string.gsub(s, &quot;\\'\\'&quot;, &quot;\\textquoteright{}&quot;)               -- ''
s = string.gsub(s, &quot;\\`\\`&quot;, &quot;\\textquoteleft{}&quot;)                -- ``
s = string.gsub(s, '\&quot;(%s)', &quot;\\textquoteright{}%1&quot;)</pre>
<p>Separating empty group “{}” only required if followed by space or ASCII:</p>
<pre class="literal-block">s = string.gsub(s, &quot;{}([^ a-zA-Z])&quot;, &quot;%1&quot;)</pre>
<p>Autosigma replacements:</p>
<pre class="literal-block">s = string.gsub(s, &quot;\\textautosigma\\noboundary&quot;, &quot;\\textsigma&quot;)  -- sv
s = string.gsub(s, &quot;\\textautosigma(\\['`~&lt;&gt;|\&quot;])&quot;, &quot;\\textsigma%1&quot;) -- accents

s = string.gsub(s, &quot;\\textautosigma([-%s!#$%%&amp;%(%)*+,./0-9:=%[%]{|}])&quot;,
                   &quot;\\textfinalsigma%1&quot;)

s = string.gsub(s, &quot;\\textautosigma(\\textquote)&quot;, &quot;\\textfinalsigma%1&quot;)
s = string.gsub(s, &quot;\\textautosigma(\\texterotimatiko)&quot;, &quot;\\textfinalsigma%1&quot;)
s = string.gsub(s, &quot;\\textautosigma(\\textanoteleia)&quot;, &quot;\\textfinalsigma%1&quot;)

s = string.gsub(s, &quot;\\textautosigma$&quot;, &quot;\\textfinalsigma&quot;)</pre>
<p>Write the result to stdout:</p>
<pre class="literal-block">io.write(s)</pre>
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