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% Modify pre_linebreak_filter callback so the spaces can be inserted
\directlua{%
luavlna = require "luavlna"
langno = require "luavlna-langno"
require "ltluatex"
luatexbase.add_to_callback("pre_linebreak_filter", luavlna.preventsingle,"LuaVlna")
luatexbase.add_to_callback("hyphenate", luavlna.split_hyphens, "allow hyphen breaks")
% -- define the attribute number
luavlna.preventsingleid = math.random(2^16)
local languages = langno.load_languages()
local get_lang_id = function(lang)
local langid = tonumber(lang)
if not tonumber(lang) then
langid = languages:get_number(lang)
end
return langid
end
% Process string and make table of enabled single letters
% By default, spaces for all single letters are inserted
% This can be modified with \singlechars macro
set_singlechars = function(lang,chars)
local utf_gmatch = unicode.utf8.gmatch
% local langnumbers = languages.names
local langid = get_lang_id(lang)
if not langid then return nil, "Cannot find language number for: "..lang end
local chars = chars or ""
local singlechars = {}
local percent = string.char(37)
local alpha = percent .. "a"
for char in utf_gmatch(chars,"("..alpha..")") do
singlechars[char] = true
end
luavlna.singlechars(langid,singlechars)
end
% set compound characters for initials handling
% useful for Czech "Ch" etc.
% comma separated list of compounds
set_compounds = function(lang, compounds)
local langid = get_lang_id(lang)
if not langid then return nil, "Cannot find language number for: "..lang end
local c = compounds:explode(",+") % match multiple colons as one
local compoundstable = {}
for _, compound in pairs(c) do
compoundstable[compound] = true
end
luavlna.initials(langid, compoundstable)
end
set_main_language = function(lang)
local langid = get_lang_id(lang)
if not langid then return nil, "Cannot find language number for: "..lang end
luavlna.set_main_language(langid)
end
enable_split_hyphens = function(lang)
local langid = get_lang_id(lang)
if not langid then return nil, "Cannot find language number for: "..lang end
luavlna.split_hyphen_langs[langid] = true
end
disable_split_hyphens = function(lang)
local langid = get_lang_id(lang)
if not langid then return nil, "Cannot find language number for: "..lang end
luavlna.split_hyphen_langs[langid] = nil
end
}
% the langno library supports both numeric and literal names
% we can try to find the language ID from macros first, if it fails
% we pass the language name to Lua. it will try to find ID in luanguage.dat and other sources
\def\singlecharsgetlang#1{%
\ifcsname lang@#1\endcsname%
\the\csname lang@#1\endcsname%
\else% unknown language macro, let langno library to find it
#1%
\fi%
}
% Set letters which are prevented from breaking
\def\singlechars#1#2{%
\directlua{set_singlechars("\singlecharsgetlang{#1}","#2")}%
}
% Define compound initials
\def\compoundinitials#1#2{%
\directlua{set_compounds("\singlecharsgetlang{#1}","#2")}%
}
% Enable inserting of visual marks for debugging
\def\preventsingledebugon{%
\directlua{luavlna.debug(true)}%
}
\def\preventsinglelang#1{%
\directlua{set_main_language("\singlecharsgetlang{#1}")}%
}
%\newluatexattribute\preventsinglestatus
\attributedef\preventsinglestatus=\directlua{tex.print(luavlna.preventsingleid)} % just a random number
\def\preventsingleon{%
\preventsinglestatus=2
}
\def\preventsingleoff{%
\preventsinglestatus=1
}
% Disable inserting of visual marks for dewbugging
\def\preventsingledebugoff{%
\directlua{luavlna.debug(false)}%
}
% enable/disable split hyphens for a language
\def\enablesplithyphens#1{\directlua{enable_split_hyphens("\singlecharsgetlang{#1}")}}
\def\disablesplithyphens#1{\directlua{disable_split_hyphens("\singlecharsgetlang{#1}")}}
% disable processing of units or degrees
\def\nopredegrees{\directlua{luavlna.no_predegrees = true}}
\def\nosufdegrees{\directlua{luavlna.no_sufdegrees = true}}
\def\nounits{\directlua{luavlna.no_unit = true}}
\def\noinitials{\directlua{luavlna.no_initials = true}}
\ifdefined\nosingledefaults\else
\singlechars{czech}{AIiVvOoUuSsZzKk}
\singlechars{slovak}{AIiVvOoUuSsZzKk}
\compoundinitials{czech}{Ch,CH}
\enablesplithyphens{czech}
\enablesplithyphens{slovak}
\fi
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