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+% detect LaTeX and use the correct method for luatexbase inclusion
+\ifx\RequirePackage\undefined
+ \input{luatexbase.sty}%
+\else
+ \RequirePackage{luatexbase}
+\fi
+
+\newluatexattribute\preventsinglestatus
+% Modify pre_linebreak_filter callback so the spaces can be inserted
+\directlua{%
+luavlna = require "luavlna"
+langno = require "luavlna-langno"
+luatexbase.add_to_callback("pre_linebreak_filter", luavlna.preventsingle," ")
+
+local languages = langno.load_languages()
+local get_lang_id = function(lang)
+ local langid = 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 = languages:get_number(lang)
+ if not langid then return nil, "Cannot find language number for: "..lang end
+ luavlna.set_main_language(langid)
+end
+}
+
+% Set letters which are prevented from breaking
+\def\singlechars#1#2{%
+\directlua{set_singlechars("#1","#2")}
+}
+
+% Define compound initials
+\def\compoundinitials#1#2{%
+\directlua{set_compounds("#1","#2")}
+}
+% Enable inserting of visual marks for debugging
+\def\preventsingledebugon{%
+\directlua{luavlna.debug(true)}
+}
+
+\def\preventsinglelang#1{%
+ \directlua{set_main_language("#1")}
+}
+
+\def\preventsingleon{%
+ \preventsinglestatus=2
+}
+
+\def\preventsingleoff{
+ \preventsinglestatus=1
+}
+% Disable inserting of visual marks for dewbugging
+\def\preventsingledebugoff{%
+\directlua{luavlna.debug(false)}
+}
+
+% 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}}
+
+\ifdefined\nosingledefaults\else
+ \singlechars{czech}{AIiVvOoUuSsZzKk}
+ \singlechars{slovak}{AIiVvOoUuSsZzKk}
+ \compoundinitials{czech}{Ch,CH}
+\fi
+