really fix #72

worldeditadditions/utils/bit.lua

@@ -13,23 +13,27 @@
 
 -- module: bit
 
-if not minetest.global_exists("bit") then
-	bit = {
+local bit_local
+
+if minetest.global_exists("bit") then
+	bit_local = bit
+else
+	bit_local = {
 		bits = 32,
 		powtab = { 1 }
 	}	
-	for b = 1, bit.bits - 1 do
-		bit.powtab[#bit.powtab + 1] = math.pow(2, b)
+	for b = 1, bit_local.bits - 1 do
+		bit_local.powtab[#bit_local.powtab + 1] = math.pow(2, b)
 	end
 end
 
 
 -- Functions
--- bit.band
-if not bit.band then
-	bit.band = function(a, b)
+-- bit_local.band
+if not bit_local.band then
+	bit_local.band = function(a, b)
 		local result = 0
-		for x = 1, bit.bits do
+		for x = 1, bit_local.bits do
 			result = result + result
 			if (a < 0) then
 				if (b < 0) then
@@ -43,11 +47,11 @@ if not bit.band then
 	end
 end
 
--- bit.bor
-if not bit.bor then
-	bit.bor = function(a, b)
+-- bit_local.bor
+if not bit_local.bor then
+	bit_local.bor = function(a, b)
 		local result = 0
-		for x = 1, bit.bits do
+		for x = 1, bit_local.bits do
 			result = result + result
 			if (a < 0) then
 				result = result + 1
@@ -61,47 +65,47 @@ if not bit.bor then
 	end
 end
 
--- bit.bnot
-if not bit.bnot then
-	bit.bnot = function(x)
-		return bit.bxor(x, math.pow((bit.bits or math.floor(math.log(x, 2))), 2) - 1)
+-- bit_local.bnot
+if not bit_local.bnot then
+	bit_local.bnot = function(x)
+		return bit_local.bxor(x, math.pow((bit_local.bits or math.floor(math.log(x, 2))), 2) - 1)
 	end
 end
 
--- bit.lshift
-if not bit.lshift then
-	bit.lshift = function(a, n)
-		if (n > bit.bits) then
+-- bit_local.lshift
+if not bit_local.lshift then
+	bit_local.lshift = function(a, n)
+		if (n > bit_local.bits) then
 			a = 0
 		else
-			a = a * bit.powtab[n]
+			a = a * bit_local.powtab[n]
 		end
 		return a
 	end
 end
 
--- bit.rshift
-if not bit.rshift then
-	bit.rshift = function(a, n)
-		if (n > bit.bits) then
+-- bit_local.rshift
+if not bit_local.rshift then
+	bit_local.rshift = function(a, n)
+		if (n > bit_local.bits) then
 			a = 0
 		elseif (n > 0) then
 			if (a < 0) then
-				a = a - bit.powtab[#bit.powtab]
-				a = a / bit.powtab[n]
-				a = a + bit.powtab[bit.bits - n]
+				a = a - bit_local.powtab[#bit_local.powtab]
+				a = a / bit_local.powtab[n]
+				a = a + bit_local.powtab[bit_local.bits - n]
 			else
-				a = a / bit.powtab[n]
+				a = a / bit_local.powtab[n]
 			end
 		end
 		return a
 	end
 end
 
--- bit.arshift
-if not bit.arshift then
-	bit.arshift = function(a, n)
-		if (n >= bit.bits) then
+-- bit_local.arshift
+if not bit_local.arshift then
+	bit_local.arshift = function(a, n)
+		if (n >= bit_local.bits) then
 			if (a < 0) then
 				a = -1
 			else
@@ -109,22 +113,22 @@ if not bit.arshift then
 			end
 		elseif (n > 0) then
 			if (a < 0) then
-				a = a - bit.powtab[#bit.powtab]
-				a = a / bit.powtab[n]
-				a = a - bit.powtab[bit.bits - n]
+				a = a - bit_local.powtab[#bit_local.powtab]
+				a = a / bit_local.powtab[n]
+				a = a - bit_local.powtab[bit_local.bits - n]
 			else
-				a = a / bit.powtab[n]
+				a = a / bit_local.powtab[n]
 			end
 		end
 		return a
 	end
 end
 
--- bit.bxor
-if not bit.bxor then
-	bit.bxor = function(a, b)
+-- bit_local.bxor
+if not bit_local.bxor then
+	bit_local.bxor = function(a, b)
 		local result = 0
-		for x = 1, bit.bits, 1 do
+		for x = 1, bit_local.bits, 1 do
 			result = result + result
 			if (a < 0) then
 				if (b >= 0) then
@@ -140,40 +144,40 @@ if not bit.bxor then
 	end
 end
 
--- bit.rol
-if not bit.rol then
-	bit.rol = function(a, b)
-		local bits = bit.band(b, bit.bits - 1)
-		a = bit.band(a, 0xffffffff)
-		a = bit.bor(bit.lshift(a, b), bit.rshift(a, ((bit.bits - 1) - b)))
-		return bit.band(n, 0xffffffff)
+-- bit_local.rol
+if not bit_local.rol then
+	bit_local.rol = function(a, b)
+		local bits = bit_local.band(b, bit_local.bits - 1)
+		a = bit_local.band(a, 0xffffffff)
+		a = bit_local.bor(bit_local.lshift(a, b), bit_local.rshift(a, ((bit_local.bits - 1) - b)))
+		return bit_local.band(n, 0xffffffff)
 	end
 end
 
--- bit.ror
-if not bit.ror then
-	bit.ror = function(a, b)
-		return bit.rol(a, - b)
+-- bit_local.ror
+if not bit_local.ror then
+	bit_local.ror = function(a, b)
+		return bit_local.rol(a, - b)
 	end
 end
 
--- bit.bswap
-if not bit.bswap then
-	bit.bswap = function(n)
-		local a = bit.band(n, 0xff)
-		n = bit.rshift(n, 8)
-		local b = bit.band(n, 0xff)
-		n = bit.rshift(n, 8)
-		local c = bit.band(n, 0xff)
-		n = bit.rshift(n, 8)
-		local d = bit.band(n, 0xff)
-		return bit.lshift(bit.lshift(bit.lshift(a, 8) + b, 8) + c, 8) + d
+-- bit_local.bswap
+if not bit_local.bswap then
+	bit_local.bswap = function(n)
+		local a = bit_local.band(n, 0xff)
+		n = bit_local.rshift(n, 8)
+		local b = bit_local.band(n, 0xff)
+		n = bit_local.rshift(n, 8)
+		local c = bit_local.band(n, 0xff)
+		n = bit_local.rshift(n, 8)
+		local d = bit_local.band(n, 0xff)
+		return bit_local.lshift(bit_local.lshift(bit_local.lshift(a, 8) + b, 8) + c, 8) + d
 	end
 end
 
--- bit.tobit
-if not bit.tobit then
-	bit.tobit = function(n)
+-- bit_local.tobit
+if not bit_local.tobit then
+	bit_local.tobit = function(n)
 		local MOD = 2^32
 		n = n % MOD
 		if (n >= 0x80000000) then
@@ -183,9 +187,9 @@ if not bit.tobit then
 	end
 end
 
--- bit.tohex
-if not bit.tohex then
-	bit.tohex = function(x, n)
+-- bit_local.tohex
+if not bit_local.tohex then
+	bit_local.tohex = function(x, n)
 		n = n or 8
 		local up
 		if n <= 0 then
@@ -195,9 +199,9 @@ if not bit.tohex then
 			up = true
 			n = -n
 		end
-		x = bit.band(x, 16^n - 1)
+		x = bit_local.band(x, 16^n - 1)
 		return ('%0'..n..(up and 'X' or 'x')):format(x)
 	end
 end
 
-return bit
+return bit_local