From e2f1c4ef174443b2807aa94a209261546bbf19fb Mon Sep 17 00:00:00 2001
From: Anthony Zhang <azhang9@gmail.com>
Date: Sat, 12 Jan 2013 18:20:41 -0500
Subject: Add //homogenize, //lua, and //luatransform commands, as well as
 their documentation.

---
 worldedit/code.lua | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 worldedit/code.lua

(limited to 'worldedit/code.lua')

diff --git a/worldedit/code.lua b/worldedit/code.lua
new file mode 100644
index 0000000..ee2d340
--- /dev/null
+++ b/worldedit/code.lua
@@ -0,0 +1,43 @@
+worldedit = worldedit or {}
+
+--executes `code` as a Lua chunk in the global namespace, returning an error if the code fails or nil otherwise
+worldedit.lua = function(code)
+	local operation, message = loadstring(code)
+	if operation == nil then --code parsing failed
+		return message
+	end
+	local status, message = pcall(operation)
+	if status == nil then --operation failed
+		return message
+	end
+	return nil
+end
+
+--executes `code` as a Lua chunk in the global namespace with the variable pos available, for each node in a region defined by positions `pos1` and `pos2`, returning an error if the code fails or nil otherwise
+worldedit.luatransform = function(pos1, pos2, code)
+	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+
+	local factory, message = loadstring("return function(pos) " .. code .. " end")
+	if factory == nil then --code parsing failed
+		return message
+	end
+	local operation = factory()
+
+	local pos = {x=pos1.x, y=0, z=0}
+	while pos.x <= pos2.x do
+		pos.y = pos1.y
+		while pos.y <= pos2.y do
+			pos.z = pos1.z
+			while pos.z <= pos2.z do
+				local status, message = pcall(operation, pos)
+				if status == nil then --operation failed
+					return message
+				end
+				pos.z = pos.z + 1
+			end
+			pos.y = pos.y + 1
+		end
+		pos.x = pos.x + 1
+	end
+	return nil
+end
\ No newline at end of file
-- 
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