}  
-----------------------< S T R I P M A R K E R S >----------------------------  
Common pattern definition location for stripmarkers so that we don't have to go
hunting for them if (when) MediaWiki changes their form.  
local stripmarkers = {
['any'] = '\127[^\127]*UNIQ%-%-(%a+)%-[%a%d]+%-QINU[^\127]*\127', -- capture returns name of stripmarker
['math'] = '\127[^\127]*UNIQ%-%-math%-[%a%d]+%-QINU[^\127]*\127' -- math stripmarkers used in coins_cleanup and coins_replace_math_stripmarker
}  
--------------< I N V I S I B L E _ C H A R A C T E R S >---------------------  
This table holds non-printing or invisible characters indexed either by name or
by Unicode group. Values are decimal representations of UTF-8 codes. The table
is organized as a table of tables because the Lua pairs keyword returns table
data in an arbitrary order. Here, we want to process the table from top to bottom
because the entries at the top of the table are also found in the ranges specified
by the entries at the bottom of the table.  
Also here is a pattern that recognizes stripmarkers that begin and end with the
delete characters. The nowiki stripmarker is not an error but some others are
because the parameter values that include them become part of the template's
metadata before stripmarker replacement.  
local invisible_defs = {
del = '\127', -- used to distinguish between stripmarker and del char
zwj = '\226\128\141', -- used with capture because zwj may be allowed
}  
local invisible_chars = {
{'replacement', '\239\191\189'}, -- U+FFFD, EF BF BD
{'zero width joiner', '('.. invisible_defs.zwj .. ')'}, -- U+200D, E2 80 8D; capture because zwj may be allowed
{'zero width space', '\226\128\139'}, -- U+200B, E2 80 8B
{'hair space', '\226\128\138'}, -- U+200A, E2 80 8A
{'soft hyphen', '\194\173'}, -- U+00AD, C2 AD
{'horizontal tab', '\009'}, -- U+0009 (HT), 09
{'line feed', '\010'}, -- U+000A (LF), 0A
{'no-break space', '\194\160'}, -- U+00A0 (NBSP), C2 A0
{'carriage return', '\013'}, -- U+000D (CR), 0D
{'stripmarker', stripmarkers.any}, -- stripmarker; may or may not be an error; capture returns the stripmaker type
{'delete', '('.. invisible_defs.del .. ')'}, -- U+007F (DEL), 7F; must be done after stripmarker test; capture to distinguish isolated del chars not part of stripmarker
{'C0 control', '[\000-\008\011\012\014-\031]'}, -- U+0000–U+001F (NULL–US), 00–1F (except HT, LF, CR (09, 0A, 0D))
{'C1 control', '[\194\128-\194\159]'}, -- U+0080–U+009F (XXX–APC), C2 80 – C2 9F
-- {'Specials', '[\239\191\185-\239\191\191]'}, -- U+FFF9-U+FFFF, EF BF B9 – EF BF BF
-- {'Private use area', '[\238\128\128-\239\163\191]'}, -- U+E000–U+F8FF, EE 80 80 – EF A3 BF
-- {'Supplementary Private Use Area-A', '[\243\176\128\128-\243\191\191\189]'}, -- U+F0000–U+FFFFD, F3 B0 80 80 – F3 BF BF BD
-- {'Supplementary Private Use Area-B', '[\244\128\128\128-\244\143\191\189]'}, -- U+100000–U+10FFFD, F4 80 80 80 – F4 8F BF BD
}  
---  
Indic script makes use of zero width joiner as a character modifier so zwj
characters must be in. This pattern covers all of the unicode characters
for these languages:
Devanagari 0900–097F – https://unicode.org/charts/PDF/U0900.pdf
Devanagari extended A8E0–A8FF – https://unicode.org/charts/PDF/UA8E0.pdf
Bengali 0980–09FF – https://unicode.org/charts/PDF/U0980.pdf
Gurmukhi 0A00–0A7F – https://unicode.org/charts/PDF/U0A00.pdf
Gujarati 0A80–0AFF – https://unicode.org/charts/PDF/U0A80.pdf
Oriya 0B00–0B7F – https://unicode.org/charts/PDF/U0B00.pdf
Tamil 0B80–0BFF – https://unicode.org/charts/PDF/U0B80.pdf
Telugu 0C00–0C7F – https://unicode.org/charts/PDF/U0C00.pdf
Kannada 0C80–0CFF – https://unicode.org/charts/PDF/U0C80.pdf
Malayalam 0D00–0D7F – https://unicode.org/charts/PDF/U0D00.pdf
plus the not-necessarily Indic scripts for Sinhala and Burmese:
Sinhala 0D80-0DFF - https://unicode.org/charts/PDF/U0D80.pdf
Myanmar 1000-109F - https://unicode.org/charts/PDF/U1000.pdf
Myanmar extended A AA60-AA7F - https://unicode.org/charts/PDF/UAA60.pdf
Myanmar extended B A9E0-A9FF - https://unicode.org/charts/PDF/UA9E0.pdf
the pattern is used by has_invisible_chars and coins_cleanup  
local indic_script = '[\224\164\128-\224\181\191\224\163\160-\224\183\191\225\128\128-\225\130\159\234\167\160-\234\167\191\234\169\160-\234\169\191]';  
-- list of emoji that use zwj character (U+200D) to combine with another emoji
local emoji = { -- indexes are decimal forms of the hex values in U+xxxx
[127752] = true, -- U+1F308 🌈 rainbow
[127806] = true, -- U+1F33E 🌾 ear of rice
[127859] = true, -- U+1F373 🍳 cooking
[127891] = true, -- U+1F393 🎓 graduation cap
[127908] = true, -- U+1F3A4 🎤 microphone
[127912] = true, -- U+1F3A8 🎨 artist palette
[127979] = true, -- U+1F3EB 🏫 school
[127981] = true, -- U+1F3ED 🏭 factory
[128102] = true, -- U+1F466 👦 boy
[128103] = true, -- U+1F467 👧 girl
[128104] = true, -- U+1F468 👨 man
[128105] = true, -- U+1F469 👩 woman
[128139] = true, -- U+1F48B 💋 kiss mark
[128187] = true, -- U+1F4BB 💻 personal computer
[128188] = true, -- U+1F4BC 💼 brief case
[128295] = true, -- U+1F527 🔧 wrench
[128300] = true, -- U+1F52C 🔬 microscope
[128488] = true, -- U+1F5E8 🗨 speech bubble
[128640] = true, -- U+1F680 🚀 rocket
[128658] = true, -- U+1F692 🚒 fire engine
[129309] = true, -- U+1F91D 🤝 handshake
[129455] = true, -- U+1F9AF 🦯 probing cane
[129456] = true, -- U+1F9B0 🦰 emoji component red hair
[129457] = true, -- U+1F9B1 🦱 emoji component curly hair
[129458] = true, -- U+1F9B2 🦲 emoji component bald
[129459] = true, -- U+1F9B3 🦳 emoji component white hair
[129466] = true, -- U+1F9BA 🦺 safety vest
[129468] = true, -- U+1F9BC 🦼 motorized wheelchair
[129469] = true, -- U+1F9BD 🦽 manual wheelchair
[129489] = true, -- U+1F9D1 🧑 adult
[9760] = true, -- U+2620 ☠ skull and crossbones
[9792] = true, -- U+2640 ♀ female sign
[9794] = true, -- U+2642 ♂ male sign
[9877] = true, -- U+2695 ⚕ staff of aesculapius
[9878] = true, -- U+2696 ⚖ scales
[9992] = true, -- U+2708 ✈ airplane
[10084] = true, -- U+2764 ❤ heavy black heart
}  
------------------------< L A N G U A G E S U P P O R T >-------------------  
These tables and constants support various language-specific functionality.  
--local this_wiki_code = mw.getContentLanguage:getCode; -- get this wiki's language code
local this_wiki_code = lang_obj:getCode; -- get this wiki's language code
if string.match (mw.site.server, 'wikidata') then
this_wiki_code = mw.getCurrentFrame:preprocess(''); -- on Wikidata so use interface language setting instead
end  
local mw_languages_by_tag_t = mw.language.fetchLanguageNames (this_wiki_code, 'all'); -- get a table of language tag/name pairs known to Wikimedia; used for interwiki tests
local mw_languages_by_name_t = {};
for k, v in pairs (mw_languages_by_tag_t) do -- build a 'reversed' table name/tag language pairs know to MediaWiki; used for |language=
v = mw.ustring.lower (v); -- lowercase for tag fetch; get name's proper case from mw_languages_by_tag_t[<tag>]
if mw_languages_by_name_t[v] then -- when name already in the table
if 2 == #k or 3 == #k then -- if tag does not have subtags
mw_languages_by_name_t[v] = k; -- prefer the shortest tag for this name
end
else -- here when name not in the table
mw_languages_by_name_t[v] = k; -- so add name and matching tag
end
end  
local inter_wiki_map = {}; -- map of interwiki prefixes that are language-code prefixes
for k, v in pairs (mw.site.interwikiMap ('local')) do -- spin through the base interwiki map (limited to local)
if mw_languages_by_tag_t[v["prefix"]] then -- if the prefix matches a known language tag
inter_wiki_map[v["prefix"]] = true; -- add it to our local map
end
end  
--script-title= and |script-chapter=  
local script_lang_codes = {
'ab', 'am', 'ar', 'be', 'bg', 'bn', 'bo', 'bs', 'dv', 'dz', 'el', 'fa', 'gu',
'he', 'hi', 'hy', 'ja', 'ka', 'kk', 'km', 'kn', 'ko', 'ku', 'ky', 'lo', 'mk',
'ml', 'mn', 'mr', 'my', 'ne', 'or', 'ota', 'ps', 'ru', 'sd', 'si', 'sr', 'syc',
'ta', 'te', 'tg', 'th', 'ti', 'ug', 'uk', 'ur', 'uz', 'yi', 'yue', 'zh'
};