From 103d4793f00b2dd592739f686e90370c2d8953a3 Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Tue, 29 Nov 2011 21:30:22 +0200
Subject: Create the necessary API for /giveme and /give and implement those
 commands; also sort out the scripts a bit

---
 data/builtin.lua | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)

(limited to 'data/builtin.lua')

diff --git a/data/builtin.lua b/data/builtin.lua
index 5f5d40f67..dc41caf69 100644
--- a/data/builtin.lua
+++ b/data/builtin.lua
@@ -147,6 +147,155 @@ minetest.register_node("ignore", {
 	air_equivalent = true,
 })
 
+--
+-- stackstring manipulation functions
+-- example stackstring: 'CraftItem "apple" 4'
+-- example item: {type="CraftItem", name="apple"}
+-- example item: {type="ToolItem", name="SteelPick", wear="23272"}
+--
+
+function stackstring_take_item(stackstring)
+	if stackstring == nil then
+		return '', nil
+	end
+	local stacktype = nil
+	stacktype = string.match(stackstring,
+			'([%a%d]+Item[%a%d]*)')
+	if stacktype == "NodeItem" or stacktype == "CraftItem" then
+		local itemtype = nil
+		local itemname = nil
+		local itemcount = nil
+		itemtype, itemname, itemcount = string.match(stackstring,
+				'([%a%d]+Item[%a%d]*) "([^"]*)" (%d+)')
+		itemcount = tonumber(itemcount)
+		if itemcount == 0 then
+			return '', nil
+		elseif itemcount == 1 then
+			return '', {type=itemtype, name=itemname}
+		else
+			return itemtype.." \""..itemname.."\" "..(itemcount-1),
+					{type=itemtype, name=itemname}
+		end
+	elseif stacktype == "ToolItem" then
+		local itemtype = nil
+		local itemname = nil
+		local itemwear = nil
+		itemtype, itemname, itemwear = string.match(stackstring,
+				'([%a%d]+Item[%a%d]*) "([^"]*)" (%d+)')
+		itemwear = tonumber(itemwear)
+		return '', {type=itemtype, name=itemname, wear=itemwear}
+	end
+end
+
+function stackstring_put_item(stackstring, item)
+	if item == nil then
+		return stackstring, false
+	end
+	stackstring = stackstring or ''
+	local stacktype = nil
+	stacktype = string.match(stackstring,
+			'([%a%d]+Item[%a%d]*)')
+	stacktype = stacktype or ''
+	if stacktype ~= '' and stacktype ~= item.type then
+		return stackstring, false
+	end
+	if item.type == "NodeItem" or item.type == "CraftItem" then
+		local itemtype = nil
+		local itemname = nil
+		local itemcount = nil
+		itemtype, itemname, itemcount = string.match(stackstring,
+				'([%a%d]+Item[%a%d]*) "([^"]*)" (%d+)')
+		itemtype = itemtype or item.type
+		itemname = itemname or item.name
+		if itemcount == nil then
+			itemcount = 0
+		end
+		itemcount = itemcount + 1
+		return itemtype.." \""..itemname.."\" "..itemcount, true
+	elseif item.type == "ToolItem" then
+		if stacktype ~= nil then
+			return stackstring, false
+		end
+		local itemtype = nil
+		local itemname = nil
+		local itemwear = nil
+		itemtype, itemname, itemwear = string.match(stackstring,
+				'([%a%d]+Item[%a%d]*) "([^"]*)" (%d+)')
+		itemwear = tonumber(itemwear)
+		return itemtype.." \""..itemname.."\" "..itemwear, true
+	end
+	return stackstring, false
+end
+
+function stackstring_put_stackstring(stackstring, src)
+	while src ~= '' do
+		--print("src="..dump(src))
+		src, item = stackstring_take_item(src)
+		--print("src="..dump(src).." item="..dump(item))
+		local success
+		stackstring, success = stackstring_put_item(stackstring, item)
+		if not success then
+			return stackstring, false
+		end
+	end
+	return stackstring, true
+end
+
+function test_stackstring()
+	local stack
+	local item
+	local success
+
+	stack, item = stackstring_take_item('NodeItem "TNT" 3')
+	assert(stack == 'NodeItem "TNT" 2')
+	assert(item.type == 'NodeItem')
+	assert(item.name == 'TNT')
+
+	stack, item = stackstring_take_item('CraftItem "with spaces" 2')
+	assert(stack == 'CraftItem "with spaces" 1')
+	assert(item.type == 'CraftItem')
+	assert(item.name == 'with spaces')
+
+	stack, item = stackstring_take_item('CraftItem "with spaces" 1')
+	assert(stack == '')
+	assert(item.type == 'CraftItem')
+	assert(item.name == 'with spaces')
+
+	stack, item = stackstring_take_item('CraftItem "s8df2kj3" 0')
+	assert(stack == '')
+	assert(item == nil)
+
+	stack, item = stackstring_take_item('ToolItem "With Spaces" 32487')
+	assert(stack == '')
+	assert(item.type == 'ToolItem')
+	assert(item.name == 'With Spaces')
+	assert(item.wear == 32487)
+
+	stack, success = stackstring_put_item('NodeItem "With Spaces" 40',
+			{type='NodeItem', name='With Spaces'})
+	assert(stack == 'NodeItem "With Spaces" 41')
+	assert(success == true)
+
+	stack, success = stackstring_put_item('CraftItem "With Spaces" 40',
+			{type='CraftItem', name='With Spaces'})
+	assert(stack == 'CraftItem "With Spaces" 41')
+	assert(success == true)
+
+	stack, success = stackstring_put_item('ToolItem "With Spaces" 32487',
+			{type='ToolItem', name='With Spaces'})
+	assert(stack == 'ToolItem "With Spaces" 32487')
+	assert(success == false)
+
+	stack, success = stackstring_put_item('NodeItem "With Spaces" 40',
+			{type='ToolItem', name='With Spaces'})
+	assert(stack == 'NodeItem "With Spaces" 40')
+	assert(success == false)
+	
+	assert(stackstring_put_stackstring('NodeItem "With Spaces" 2',
+			'NodeItem "With Spaces" 1') == 'NodeItem "With Spaces" 3')
+end
+test_stackstring()
+
 --
 -- Callback registration
 --
-- 
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