Module:Detect singular

local p = {} local getArgs = require('Module:Arguments').getArgs local yesNo = require('Module:Yesno') local getPlain = require('Module:Text').Text.getPlain

-- function to determine whether "sub" occurs in "s" local function plainFind(s, sub) return mw.ustring.find(s, sub, 1, true) end

-- function to count the number of times "pattern" (a regex) occurs in "s" local function countMatches(s, pattern) local _, count = mw.ustring.gsub(s, pattern, '') return count end

local singular = 1 local likelyPlural = 2 local plural = 3

-- Determine whether a string is singular or plural (i.e., it represents one -- item or many) -- Arguments: --  origArgs[1]: string to process --  origArgs.no_comma:  if false, use commas to detect plural (default false) --  origArgs.parse_links: if false, treat wikilinks as opaque singular objects (default false) -- Returns: --  singular, likelyPlural, or plural (see constants above), or nil for completely unknown function p._main(origArgs) origArgs = type(origArgs) == 'table' and origArgs or {} local args = {} -- canonicalize boolean arguments for key, default in pairs({no_comma=false,parse_links=false,any_comma=false,no_and=false}) do		if origArgs[key] == nil then args[key] = default else args[key] = yesNo(origArgs[key],default) end end local checkComma = not args.no_comma local checkAnd = not args.no_and local rewriteLinks = not args.parse_links local anyComma = args.any_comma local s = origArgs[1] -- the input string if not s then return nil -- empty input returns nil end s = tostring(s) s = mw.text.decode(s,true) --- replace HTML entities (to avoid spurious semicolons) if plainFind(s,'data-plural="0"') then -- magic data string to return true return singular end if plainFind(s,'data-plural="1"') then -- magic data string to return false return plural end -- count number of list items local numListItems = countMatches(s,'<%s*li') -- if exactly one, then singular, if more than one, then plural if numListItems == 1 then return singular end if numListItems > 1 then return plural end -- if "list of" occurs inside of wlink, then it's plural if mw.ustring.find(s:lower, '%[%^%*list of[^%]]+%]%]') then return plural end -- fix for trailing br tags passed through template:marriage s = mw.ustring.gsub(s, '<%s*br[^>]*>%s*', '%1') -- replace all wikilinks with fixed string if rewriteLinks then s = mw.ustring.gsub(s,'%b[]','WIKILINK') end -- Five conditions: any one of them can make the string a likely plural or plural local hasBreak = mw.ustring.find(s,'<%s*br') -- For the last 4, evaluate on string stripped of wikimarkup s = getPlain(s) local hasBullets = countMatches(s,'%*+') > 1 local multipleQids = mw.ustring.find(s,'Q%d+[%p%s]+Q%d+') -- has multiple QIDs in a row if hasBullets or multipleQids then return plural end local commaPattern = anyComma and '[,;]' or '%D[,;]%D' -- semi-colon similar to comma local hasComma = checkComma and mw.ustring.find(s, commaPattern) local hasAnd = checkAnd and mw.ustring.find(s,'[,%s]and%s') if hasBreak or hasComma or hasAnd then return likelyPlural end return singular end

function p._pluralize(args) args = type(args) == 'table' and args or {} local singularForm = args[3] or args.singular or "" local pluralForm = args[4] or args.plural or "" local likelyForm = args.likely or pluralForm local link = args[5] or args.link if link then link = tostring(link) singularForm = ..singularForm.. pluralForm = ..pluralForm.. likelyForm = ..likelyForm.. end if args[2] then return pluralForm end local detect = p._main(args) if detect == nil then return ""  -- return blank on complete failure end if detect == singular then return singularForm elseif detect == likelyPlural then return likelyForm else return pluralForm end end

function p.main(frame) local args = getArgs(frame) -- For template, return 1 if singular, blank if plural or empty local result = p._main(args) if result == nil then return 1 end return result == singular and 1 or "" end

function p.pluralize(frame) local args = getArgs(frame) return p._pluralize(args) end

return p