Module:TextUtil

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-- Source for gsplit, split, and trim: https://phabricator.wikimedia.org/diffusion/ELUA/browse/master/includes/engines/LuaCommon/lualib/mw.text.lua

local p = {}

function p.gsplit( text, pattern, plain )
	if not pattern then pattern = '%s*,%s*' end
	local s, l = 1, text:len()
	return function ()
		if s then
			local e, n = text:find( pattern, s, plain )
			local ret
			if not e then
				ret = text:sub( s )
				s = nil
			elseif n < e then
				-- Empty separator!
				ret = text:sub( s, e )
				if e < l then
					s = e + 1
				else
					s = nil
				end
			else
				ret = e > s and text:sub( s, e - 1 ) or ''
				s = n + 1
			end
			return ret
		end
	end, nil, nil
end

function p.splitNonempty(text, pattern, plain)
	if text == '' then
		return {}
	end
	return p.split(text, pattern, plain)
end

function p.split(text, pattern, plain)
	if not text then
		return {}
	end
	local ret = {}
	for m in p.gsplit(text, pattern, plain) do
		ret[#ret+1] = m
	end
	return ret
end

function p.trim( s, charset )
	charset = charset or '\t\r\n\f '
	s = s:gsub( '^[' .. charset .. ']*(.-)[' .. charset .. ']*$', '%1' )
	return s
end

function p.escape(link)
	link = link or ''
	-- because of gsub not letting you have - unescaped
	link = string.gsub(link,'%-','%%%-')
	link = string.gsub(link,'%(','%%%(')
	link = string.gsub(link,'%)','%%%)')
	link = string.gsub(link,'%+','%%%+')
	return link
end

function p.nextLetter(char)
	return string.char(char:byte() + 1)
end

function p.extLink(link, text)
	if link == '' then link = nil end
	if not link then
		return
	end
	return ('[%s %s]'):format(link, text or 'Link')
end

function p.intLink(link, text)
	if link == '' then link = nil end
	if not link and not text then
		return
	end
	return ('[[%s|%s]]'):format(link or text, text or 'Link')
end

function p.link(link, text)
	if link:find('http') then
		return p.extLink(link, text)
	else
		return p.intLink(link, text)
	end
end

function p.extLinkOrText(link, text)
	if link == '' then link = nil end
	if not link then return text end
	return ('[%s %s]'):format(link, text or link)
end

function p.intLinkOrText(link, text)
	if link == '' then link = nil end
	if not link then return text end
	return ('[[%s|%s]]'):format(link, text or link)
end

function p.linkOrText(link, text)
	if link:find('http') then
		return p.extLinkOrText(link, text)
	else
		return p.intLinkOrText(link, text)
	end
end

return p