The.Failboat.me » Lua

Rocket: A Lua Sqlite3 ORM manager

Lee — Mon, 26 Jul 2010 04:44:44 +0000

Relational databases are designed so that they can both store and describe data. Most programming level APIs do wonderful jobs of maintaining the former aspect. I mean, what ORM doesn’t automatically map the insert method to the so very generic…

See.lua – Documentation

Lee — Sun, 25 Jul 2010 04:56:36 +0000

See.lua – A Lua introspection library

	> see(string)

	.byte(?)            .char(?)            .dump(?)            .find(?)
	.format(?)          .gfind(?)           .gmatch(?)          .gsub(?)
	.join(self, table, ...)                 .len(?)
	.lower(?)           .match(?)           .rep(?)             .reverse(?)
	.sub(?)             .upper(?)

Lua is a wonderful little language that lets you do…

see.lua – Introspecting Lua objects

Lee — Fri, 23 Jul 2010 02:53:01 +0000

As via its python equivalent, see.lua takes in an object and prints out a list of its elements as well as metatable methods in readable text.

> require "see"

> s = see(string)
.byte(?)            .char(?)            .dump(?)            .find(?)

…

Tips and Tricks for Lua Beginners: Writing an at.exit registry

Lee — Fri, 16 Jul 2010 18:24:36 +0000

It’s relatively simple to write a function that takes in a function and executes it once Lua terminates.

at = {}
function at.exit(fn)
     getmetatable(newproxy(true)).__gc = fn
end

The caveat for at.exit() is that on…

Lua – Get a table of function arguments

Lee — Fri, 16 Jul 2010 18:04:51 +0000

The lua standard libraries do not provide anything that helps you get the table of arguments for a given function. This can be accomplished by directly introspecting the bytecode of the function. The following snippet generates a function get_args that…

Lua – Get number of parameters in a function

Lee — Thu, 15 Jul 2010 16:04:22 +0000

The following snippet defines a function num_args(func) that returns the number of parameters within a function as a string:

num_args(function(a,b,c) end) --> 3

It also works with functions that have variable arguments:

num_args(function(a,...)

…

Serializing Lua objects into Lua Code

Lee — Wed, 14 Jul 2010 04:00:08 +0000

The following little snippet allows you to ‘pickle’ Lua objects directly into Lua code (with the exception of functions, which are serialized as raw bytecode). Metatable support is on the way, but for now, it should be useful enough.

Example…

Lua Exception Handling

Lee — Sat, 10 Apr 2010 02:11:26 +0000

Wouldn’t it be awsome if you could do something like

dofile "try"

try{
	function()
		a = a/a
	end
}.except(Exceptions.ValueError){
	function(_, exceptions, detail)
		print(detail)
	end
}

And get

lua:5: attempt to perform arithmetic on

…

Context aware Lua Macros

Lee — Fri, 19 Feb 2010 01:06:43 +0000

Will automatically detect locals as well as global variables.

Usage: Macro “text ${Lua Code} more text”

test = Macro "Hello ${jack} ${'Bauer'}"

function test1()
	local jack = "Jack"
	print(test)
end

test1()

function test2()
	local jack = "No

…

Lua Tutorials -> Luatut.com

Lee — Mon, 01 Feb 2010 21:17:40 +0000

A new set of Lua Tutorials are coming out.

http://luatut.com/

[Lua] MapParser (High Level API)

Lee — Mon, 26 Oct 2009 04:20:52 +0000

This is a Map parser library for CS2D’s lua engine. Benchmarked to process 6,000 tiles per second. (A 2,000% improvement over the older parser). This also demonstrates that it is possible to have object-orientation within a lua script

…

Overcomplicated Hello World example in Lua

Lee — Tue, 14 Jul 2009 07:51:27 +0000

As we all know, writing a hello world script in Lua consists of no more and no less then the simple use of print(“Hello World!”). However, given the simplicity of such a task, I set out to create something much…

Wordfilter in Lua

Lee — Wed, 24 Jun 2009 04:36:47 +0000

I’ve been getting bored lately so I’ve decided to create a wordfilter in Lua, it’s really basic actually, but useful. The concept goes something like this. You take a list of naughty words, and filter them out of the text.…