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#!/usr/bin/env lua
-- LGR Transcription to Greek LICR transformation
-- **********************************************
--
-- :Copyright: © 2010 Günter Milde
-- :Licence: This work may be distributed and/or modified under the
-- conditions of the `LaTeX Project Public License`_, either
-- version 1.3 of this license or any later version.
--
-- .. _LaTeX Project Public License: http://www.latex-project.org/lppl.txt
--
-- The LGR font encoding is the de-facto standard for Greek typesetting with
-- LaTeX. This file provides a translation from the Latin transliteration defined
-- by LGR into the LaTeX Internal Character Representation (LICR) macros.
--
-- ::
usage = [[
Usage: lua lgr2licr.lua [OPTIONS] [STRING]
Convert STRING from Latin transliteration 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
-- Get input string::
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
-- The mapping from the LGR Latin transliteration to LICR macros::
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{}",
}
-- Return substitution string for 3 captures:
--
-- `c1` backslash
-- `c2` a-zA-Z
-- `c3` any other char
-- ::
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)
-- Ligatures::
s = string.gsub(s, "%(%(", "\\guillemetleft{}")
s = string.gsub(s, "%)%)", "\\guillemetright{}")
s = string.gsub(s, "\\'\\'", "\\textquoteright{}") -- ''
s = string.gsub(s, "\\`\\`", "\\textquoteleft{}") -- ``
s = string.gsub(s, '\"(%s)', "\\textquoteright{}%1")
-- Separating empty group "{}" only required if followed by space or ASCII::
s = string.gsub(s, "{}([^ a-zA-Z])", "%1")
-- Autosigma replacements::
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")
-- Write the result to stdout::
io.write(s)
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