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https://github.com/AquariaOSE/Aquaria.git
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3b759294df
This uses a new <Compatibility script="..." /> tag in a mod's XML file. A compatbility layer is a script that runs before mod-init.lua is loaded, and before any mod scripts are loaded when resuming a saved game. This is a better solution than shipping a fragile wrapper with every mod, that tends to break and then needs to be updated. Now this wrapper is centralized, easy to use, and easy to update. Closes #31.
107 lines
3.8 KiB
Lua
107 lines
3.8 KiB
Lua
-- Compatibility wrapper [interface detouring]
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-- allows to run scripts written for the old script interface (1.1.0, 1.1.1, 1.1.2)
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-- on 1.1.3+ / OSE and its new scripting interface.
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-- Note that this is a gross hack and a lot of guesswork is involved,
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-- but any sanely written mod should run without changes.
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-- Notes:
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-- * Any assignment to the global "v" will break things. Like v = 0.
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-- * Variables whose names only contain all-uppercase, underscores, and numbers are considered globals.
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-- Assignments to those will not cause warnings and go to _G.
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-- Assignments to non-globals will go to _G.v.
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-- Undefined reads from either _G or v will cause a warning (in dev mode).
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-- * Mods can provide their own compatibility hooks.
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local rawset = rawset
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local rawget = rawget
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local _G = _G
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local debug = rawget(_G, "debug") -- not present in some 1.1.3+ versions
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local function looksLikeGlobal(s)
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return not s:match("[^_%u%d]")
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end
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dofile("scripts/compat/internal/oldfunctions.lua")
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-- loading entityinclude.lua is no longer necessary and would do more bad than good,
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-- so make sure it's not loaded even if scripts explicitly load that file.
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local o_dofile = dofile
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local function dofileWrap(file)
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if file:lower() ~= "scripts/entities/entityinclude.lua" then -- already in
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--debugLog("dofile(" .. file .. ")")
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return o_dofile(file)
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end
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end
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rawset(_G, "dofile", dofileWrap)
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-----------------------------------------------------
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---- Fixup functions that differ in behavior now ----
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-----------------------------------------------------
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local createEntity_o = createEntity
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rawset(_G, "createEntity", function(e, name, x, y)
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if type(e) == "string" and #e > 0 then
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return createEntity_o(e, name, x, y)
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end
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return 0
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end)
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-- Prepare interface function lookup table
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local INTERFACE_LUT = {}
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do
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local names = getInterfaceFunctionNames()
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--errorLog(table.concat(names, ", "))
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for i = 1, #names do
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INTERFACE_LUT[names[i]] = true
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end
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end
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-- Detour global reads and writes to the currently active instance table
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-- n = 0 will become v.n = 0
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-- local x = entity_x(n) will become local x = entity_x(v.n)
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-- important here is that no instance-local variables accidentally become globals.
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-- globals that get written into the instance table are no problem. (if it ever happens - doubt it)
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local _G_meta =
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{
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__index = function(tab, key)
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if not INTERFACE_LUT[key] then
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local v = rawget(_G, "v")
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return v and v[key]
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end
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end,
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__newindex = function(tab, key, val)
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if key == "v" then -- v is set by the engine whenever script context is switched, this is no problem
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if val ~= nil and type(val) ~= "table" then
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errorLog("WARNING: COMPAT: Setting v to non-table (" .. type(v) .. ")! This is BAD and WILL break something!\n", 3)
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-- but do it anyway.
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end
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rawset(tab, key, val)
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return
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end
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if INTERFACE_LUT[key] then
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--debugLog("Setting interface: " .. tostring(key) .. " = " .. tostring(val))
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rawset(tab, key, val)
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return
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end
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if type(key) == "string" and looksLikeGlobal(key) then
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--debugLog("Setting global: " .. tostring(key) .. " = " .. tostring(val))
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rawset(tab, key, val)
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return
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end
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local v = rawget(_G, "v")
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if v then
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--debugLog("Setting v." .. tostring(key) .. " = " .. tostring(val))
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v[key] = val
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return
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end
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errorLog("Variable not set: " .. tostring(key) .. " = " .. tostring(val))
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end
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}
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setmetatable(_G, _G_meta)
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rawset(_G, "OLD_SCRIPT_INTERFACE_COMPATIBLE", true) -- mod-init.lua should check for this
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debugLog("COMPAT/1.1: Redirecting global writes to v")
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