Module:Data

The Data module exists to translate information from Data: pages to templates/articles.

Arguments

<1> (Entity): This argument is taken as the title of the intended Data: page to search through.

E.g.: "Kerbol", "LW-Sw "SWERV""

<2+> (Parameter chain): Arguments 2 and beyond define the parameter chain to search on the data page.

E.g.: "mass", "max_temp", "modules|engine|isp_vac", "modules|generator|outputs|units"

Functions

getData: The primary function of the module. Accepts the full argument set to determine the parameter to return from the subject.

getFuelLabels: Used for engine infobox construction. Accepts a part name (only works for engines) for <1> and optionally "alt" for <2>. Returns a line-break separated list of the propellant names used by an engine mode. Should probably be moved to a different Module.

getFuelValues: Used for engine infobox construction. Accepts a part name (only works for engines) for <1> and optionally "alt" for <2>. Returns a line-break separated list of the propellant use rates of an engine mode. Should probably be moved to a different Module.

Examples

A list of example JSON sets can be found at Data:Example.

{{#invoke:Data|getData|LV-SW "SWERV"|mass}} - Returns the mass of the "SWERV" in tons, 10.00.

{{#invoke:Data|getData|LV-3000 "Tuba"|modules|engine|thrust|vac}} - Returns the vacuum thrust of the "Tuba" in kilonewtons, 510.0.

---

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

-- args:
-- subject: The subject entity to get data from. 
--- E.g., "Kerbol", "LW-Sw "SWERV""
-- param: The parameter / parameter chain to access from the data page. 
--- E.g., "mass", "max_temp", "modules|engine|isp_vac", "modules|generator|outputs|units"

function p.getData(frame)
	-- Get arguments from the invoke
	local args = getArgs(frame) -- E.g., args = {"Example", "modules", "engine", "isp", "vac"}
	
	-- Load the JSON from the Data: page
	local dataJson = mw.loadJsonData("Data:"..args[1])
	dataJson = dataJson[args[2]]
	
	--local dataJson = mw.title.new("Data:"..args[1]):getContent()
	--dataJson = mw.text.jsonDecode(dataJson)
	
	-- This approach doesn't return anything useable, apparently
	--local dataTab = require("Module:Example")
	--local jsonData = dataTab.data
	
	-- Iterate through the JSON using the remaining args
	for i = 3, #args do
		-- Each loop steps into the next level JSON table, 
		-- leaving the final value at the end
		dataJson = dataJson[args[i]]
	end
	
	-- This line returns the value as a proper string
	--return dataJson[args[2]][args[3]][args[4]][args[5]]
	
	-- This, for some reason, returns a "table" despite coming back as a
	-- string when testing the same code in the console.
	return dataJson--[args[2]]["engine"]["isp"]["vac"]
end

-- This func returns a "string" to the #invoke
function p.test()
    local dataJson = mw.loadJsonData("Data:Example")
    local temp = dataJson["modules"]["engine"]

    return(temp["isp"]["vac"])
end

return p