Add a maidroid core for player made programs

maidroid_core/cores/ocr.lua

@@ -0,0 +1,108 @@
+------------------------------------------------------------
+-- Copyright (c) 2016 tacigar. All rights reserved.
+-- https://github.com/tacigar/maidroid
+------------------------------------------------------------
+
+local maidroid_instruction_set = {
+	getpos = function(_, thread)
+		local pos = thread.droid.object:getpos()
+		return true, {pos.x, pos.y, pos.z}
+	end,
+
+	beep = function(_, thread)
+		minetest.sound_play("maidroid_beep", {pos = thread.droid.object:getpos()})
+		return true
+	end,
+
+	getyaw = function(_, thread)
+		return true, thread.droid.object:getyaw()
+	end,
+
+	setyaw = function(params, thread)
+		if #params ~= 1 then
+			return false, "wrong number of arguments"
+		end
+		local p = params[1]
+		if type(p) ~= "number" then
+			return false, "unsupported argument"
+		end
+		thread.droid.object:setyaw(p)
+		return true
+	end,
+}
+
+
+local function mylog(log)
+	-- This happens to the maidroids messages
+	minetest.chat_send_all("maidroid says " .. log)
+end
+
+-- the program is loaded from a "default:book_written" with title "main"
+-- if it's not present, following program is used in lieu:
+local dummycode = [[
+beep
+print $No book with title "main" found.
+]]
+
+local function get_code(self)
+	local list = self:get_inventory():get_list"main"
+	for i = 1,#list do
+		local stack = list[i]
+		if stack:get_name() == "default:book_written" then
+			local data = minetest.deserialize(stack:get_metadata())
+			if data
+			and data.title == "main" then
+				return data.text
+			end
+		end
+	end
+end
+
+local function on_start(self)
+	self.object:setacceleration{x = 0, y = -10, z = 0}
+	self.object:setvelocity{x = 0, y = 0, z = 0}
+
+	local parsed_code = pdisc.parse(get_code(self) or dummycode)
+	self.thread = pdisc.create_thread(function(thread)
+		thread.flush = function(self)
+			mylog(self.log)
+			self.log = ""
+			return true
+		end
+		table.insert(thread.is, 1, maidroid_instruction_set)
+		thread.droid = self
+	end, parsed_code)
+	self.thread:suscitate()
+end
+
+local function on_step(self)
+	local thread = self.thread
+	if thread.stopped then
+		thread:try_rebirth()
+	end
+end
+
+local function on_resume(self)
+	self.thread:continue()
+end
+
+local function on_pause(self)
+	self.thread:flush()
+end
+
+local function on_stop(self)
+	self.thread:exit()
+
+	self.object:setvelocity{x = 0, y = 0, z = 0}
+end
+
+-- register a definition of a new core.
+maidroid.register_core("maidroid_core:ocr", {
+	description      = "OCR programmable maidroid core",
+	inventory_image  = "maidroid_core_ocr.png",
+	on_start         = on_start,
+	on_stop          = on_stop,
+	on_resume        = on_resume,
+	on_pause         = on_pause,
+	on_step          = on_step,
+})

maidroid_core/depends.txt

@@ -1 +1,2 @@
 maidroid
+pdisc?

maidroid_core/init.lua

@@ -12,3 +12,6 @@ dofile(maidroid_core.modpath .. "/cores/_aux.lua")
 dofile(maidroid_core.modpath .. "/cores/empty.lua")
 dofile(maidroid_core.modpath .. "/cores/basic.lua")
 dofile(maidroid_core.modpath .. "/cores/farming.lua")
+if pdisc then
+	dofile(maidroid_core.modpath .. "/cores/ocr.lua")
+end