Module:LuaCall

From Test Wiki
Revision as of 14:13, 11 October 2020 by w>Pppery (This module is complicated enough as is. You don't need to add even more tangential functions, when p.call was working perfectly fine for months)

Documentation for this module may be created at Module:LuaCall/doc

local p={}

function p.main(frame)
    local parent=frame.getParent(frame) or {}
    local reserved_value={}
    local reserved_function,reserved_contents
    for k,v in pairs(parent.args or {}) do
        _G[k]=tonumber(v) or v -- transfer every parameter directly to the global variable table
    end
    for k,v in pairs(frame.args or {}) do
        _G[k]=tonumber(v) or v -- transfer every parameter directly to the global variable table
    end
     --- Alas Scribunto does NOT implement coroutines, according to
     --- http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#string.format
     --- this will not stop us from trying to implement one single lousy function call
    if _G[1] then
        reserved_function,reserved_contents=mw.ustring.match(_G[1],"^%s*(%a[^%s%(]*)%(([^%)]*)%)%s*$")
    end
    if reserved_contents then
        local reserved_counter=0
        repeat
            reserved_counter=reserved_counter+1
            reserved_value[reserved_counter]=_G[mw.ustring.match(reserved_contents,"([^%,]+)")]
            reserved_contents=mw.ustring.match(reserved_contents,"[^%,]+,(.*)$")
        until not reserved_contents
    end
    local reserved_arraypart=_G
    while mw.ustring.match(reserved_function,"%.") do
        reserved_functionpart,reserved_function=mw.ustring.match(reserved_function,"^(%a[^%.]*)%.(.*)$")
        reserved_arraypart=reserved_arraypart[reserved_functionpart]
    end
    local reserved_call=reserved_arraypart[reserved_function]
    if type(reserved_call)~="function" then
        return tostring(reserved_call)
    else reserved_output={reserved_call(unpack(reserved_value))}
        return reserved_output[reserved_return or 1]
    end
end

local function tonumberOrString(v)
	return tonumber(v) or v:gsub("^\\", "", 1)
end

local function callWithTonumberOrStringOnPairs(f, ...)
	local args = {}
	for _, v in ... do
		table.insert(args, tonumberOrString(v))
	end
	return (f(unpack(args)))
end

--[[
------------------------------------------------------------------------------------
-- ipairsAtOffset

-- This is an iterator for arrays. It can be used like ipairs, but with
-- specified i as first index to iterate. i is an offset from 1
--
------------------------------------------------------------------------------------
--]]
local function ipairsAtOffset(t, i)
	local f, s, i0 = ipairs(t)
	return f, s, i0+i
end

local function get(s)
	local G = _G; for _ in mw.text.gsplit(
		mw.text.trim(s, '%s'), '%s*%.%s*'
	) do
		G = G[_]
	end
	return G
end

--[[
------------------------------------------------------------------------------------
-- call
--
-- This function is usually useful for debugging template parameters.
-- Prefix parameter with backslash (\) to force interpreting parameter as string.
-- The leading backslash will be removed before passed to Lua function.
--
-- Example:
--    {{#invoke:LuaCall|call|mw.log|a|1|2|3}} will return results of mw.log('a', 1, 2, 3)
--    {{#invoke:LuaCall|call|mw.logObject|\a|321|\321| \321 }} will return results of mw.logObject('a', 321, '321', ' \\321 ')
--
-- This example show the debugging to see which Unicode characters are allowed in template parameters,
--    {{#invoke:LuaCall|call|mw.ustring.codepoint|{{#invoke:LuaCall|call|mw.ustring.char|0x0061}}}} return 97
--    {{#invoke:LuaCall|call|mw.ustring.codepoint|{{#invoke:LuaCall|call|mw.ustring.char|0x0000}}}} return 65533
--    {{#invoke:LuaCall|call|mw.ustring.codepoint|{{#invoke:LuaCall|call|mw.ustring.char|0x0001}}}} return 65533
--    {{#invoke:LuaCall|call|string.format|0x%04x|{{#invoke:LuaCall|call|mw.ustring.codepoint|{{#invoke:LuaCall|call|mw.ustring.char|0x0002}}}}}} return 0xfffd
--    {{#invoke:LuaCall|call|string.format|0x%04x|{{#invoke:LuaCall|call|mw.ustring.codepoint|{{#invoke:LuaCall|call|mw.ustring.char|0x007e}}}}}} return 0x007e
--    {{#invoke:LuaCall|call|string.format|0x%04x|{{#invoke:LuaCall|call|mw.ustring.codepoint|{{#invoke:LuaCall|call|mw.ustring.char|0x007f}}}}}} return 0x007f
--    {{#invoke:LuaCall|call|string.format|0x%04x|{{#invoke:LuaCall|call|mw.ustring.codepoint|{{#invoke:LuaCall|call|mw.ustring.char|0x0080}}}}}} return 0x0080
--    {{#invoke:LuaCall|call|string.format|0x%04x|{{#invoke:LuaCall|call|mw.ustring.codepoint|{{#invoke:LuaCall|call|mw.ustring.char|0x00a0}}}}}} return 0x00a0
--
------------------------------------------------------------------------------------
--]]
function p.call(frame)
	return callWithTonumberOrStringOnPairs(get(frame.args[1]),
		ipairsAtOffset(frame.args, 1)
	)
end

--local TableTools = require('Module:TableTools')
--[[
------------------------------------------------------------------------------------
-- get
--
-- Example:
--    {{#invoke:LuaCall|get| math.pi }} will return value of math.pi
--    {{#invoke:LuaCall|get|math|pi}} will return value of math.pi
--    {{#invoke:LuaCall|get| math |pi}} will return value of _G[' math '].pi
--    {{#invoke:LuaCall|get|_G| math.pi }} will return value of _G[' math.pi ']
--    {{#invoke:LuaCall|get|obj.a.5.c}} will return value of obj.a['5'].c
--    {{#invoke:LuaCall|get|obj|a|5|c}} will return value of obj.a[5].c
--
------------------------------------------------------------------------------------
--]]
function p.get(frame)
	-- #frame.args always return 0, regardless of number of unnamed
	-- template parameters, so check manually instead
	if frame.args[2] == nil then
		-- not do tonumber() for this args style,
		-- always treat it as string,
		-- so 'obj.1' will mean obj['1'] rather obj[1]
		return get(frame.args[1])
	else
		local G = _G
		for _, v in ipairs(frame.args) do
			G = G[tonumberOrString(v)]
		end
		return G
	end
end

--[[
------------------------------------------------------------------------------------
-- invoke
--
-- This function is used by Template:Invoke
--
------------------------------------------------------------------------------------
--]]
function p.invoke(frame)
	local func
	local offset
	if frame.args[1] ~= nil then
		local m = require('Module:' .. frame.args[1])
		if frame.args[2] ~= nil then
			func = m[frame.args[2]]
			frame.args = frame:getParent().args
			offset = 0
		else
			frame.args = frame:getParent().args
			func = m[frame.args[1]]
			offset = 1
		end
	else
		frame.args = frame:getParent().args
		func = require('Module:' .. frame.args[1])[frame.args[2]]
		offset = 2
	end
	local args = {}
	for _, v in ipairsAtOffset(frame.args, offset) do
		table.insert(args, v)
	end
	frame.args = args
	return func(frame)
end

return p