View source for Module:Term

local p = {}
local getArgs = require('Module:Arguments').getArgs

local terms_json = mw.loadJsonData("Module:Term/terms.json")
local term_links_json = mw.loadJsonData("Module:Term/term links.json")

local function assert_not_nil(value, error_message)
    if value == nil then
        if error_message == nil then
            error("value is nil")
        else
            error(error_message)
        end
    end
end

-- =========================

-- Lookups term link from the json. Return nil if there's no definition for the term.
local function lookup_term(term)
	return terms_json[string.lower(term)]
end

-- Lookups term link from the json. Return nil if no link is defined for the term.
local function lookup_term_link(term)
	return term_links_json[string.lower(term)]
end

-- Generates a term element with a tooltip and/or a link.
function p.main(frame)
	local args = getArgs(frame)
	local term = args[1]
	assert_not_nil(term, "failed to generate term: term not provided")
	
	local term_definition = lookup_term(term)
	local term_link = lookup_term_link(term)
	
	if term_definition == nil and term_link == nil then
		error("failed to generate term: no defintiion nor link found for term '" .. term .. "'")
	end
	
	local term_text_result = term_link == nil and term or "[[" .. term_link .. "|" .. term .. "]]"
	
	if term_definition == nil then
		-- no definition = return just the link
		return term_text_result
	else
		-- yes definition = generate a tooltip
		return frame:expandTemplate{
			title = 'Tooltip',
			args = {
				term_link == nil and term or "[[" .. term_link .. "|" .. term .. "]]",
				term_definition
			}
		}
	end
end

return p
Description	What you type	What you get
Italic	''Italic text''	Italic text
Bold	'''Bold text'''	Bold text
Bold & italic	'''''Bold & italic text'''''	*Bold & italic text*