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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 = 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
-
-enable_split_hyphens = function(lang)
- local langid = languages:get_number(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 = languages:get_number(lang)
- if not langid then return nil, "Cannot find language number for: "..lang end
- luavlna.split_hyphen_langs[langid] = nil
-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")}
-}
-
-%\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("#1")}}
-\def\disablesplithyphens#1{\directlua{disable_split_hyphens("#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}}
-
-\ifdefined\nosingledefaults\else
- \singlechars{czech}{AIiVvOoUuSsZzKk}
- \singlechars{slovak}{AIiVvOoUuSsZzKk}
- \compoundinitials{czech}{Ch,CH}
- \enablesplithyphens{czech}
-\fi
-