Failu krātuve :: Lua/
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What is Lua?
Lua is a powerful, fast, lightweight, embeddable scripting language.
Lua combines simple procedural syntax with powerful data description
constructs based on associative arrays and extensible semantics. Lua
is dynamically typed, runs by interpreting bytecode for a
register-based virtual machine, and has automatic memory management
with incremental garbage collection, making it ideal for
configuration, scripting, and rapid prototyping.
Why choose Lua?
Lua is a proven, robust language
Lua has been used in many industrial applications (e.g., Adobe's
Photoshop Lightroom), with an emphasis on embedded systems (e.g.,
the Ginga middleware for digital TV in Brazil) and games (e.g.,
World of Warcraft). Lua is currently the leading scripting language
in games. Lua has a solid reference manual and there are several
books about it. Several versions of Lua have been released and used
in real applications since its creation in 1993. Lua featured in
HOPL III, the Third ACM SIGPLAN History of Programming Languages
Conference, in June 2007.
Lua is fast
Lua has a deserved reputation for performance. To claim to be "as
fast as Lua" is an aspiration of other scripting languages. Several
benchmarks show Lua as the fastest language in the realm of
interpreted scripting languages. Lua is fast not only in fine-tuned
benchmark programs, but in real life too. A substantial fraction of
large applications have been written in Lua.
Lua is portable
Lua is distributed in a small package and builds out-of-the-box in
all platforms that have an ANSI/ISO C compiler. Lua runs on all
flavors of Unix and Windows, and also on mobile devices (such as
handheld computers and cell phones that use BREW, Symbian, Pocket
PC, etc.) and embedded microprocessors (such as ARM and Rabbit) for
applications like Lego MindStorms.
For specific reasons why Lua is a good choice also for constrained
devices, read this summary by Mike Pall. See also a poster created
by Timm Müller.
Lua is embeddable
Lua is a fast language engine with small footprint that you can
embed easily into your application. Lua has a simple and well
documented API that allows strong integration with code written in
other languages. It is easy to extend Lua with libraries written in
other languages. It is also easy to extend programs written in other
languages with Lua. Lua has been used to extend programs written not
only in C and C++, but also in Java, C#, Smalltalk, Fortran, Ada,
Erlang, and even in other scripting languages, such as Perl and Ruby.
Lua is powerful (but simple)
A fundamental concept in the design of Lua is to provide
meta-mechanisms for implementing features, instead of providing a
host of features directly in the language. For example, although Lua
is not a pure object-oriented language, it does provide
meta-mechanisms for implementing classes and inheritance. Lua's
meta-mechanisms bring an economy of concepts and keep the language
small, while allowing the semantics to be extended in unconventional
Lua is small
Adding Lua to an application does not bloat it. The tarball for Lua
5.1.4, which contains source code, documentation, and examples,
takes 212K compressed and 860K uncompressed. The source contains
around 17000 lines of C. Under Linux, the Lua interpreter built with
all standard Lua libraries takes 153K and the Lua library takes 203K.
Lua is free
Lua is free open-source software, distributed under a very liberal
license (the well-known MIT license). It may be used for any
purpose, including commercial purposes, at absolutely no cost. Just
download it and use it.
Where does Lua come from?
Lua is designed, implemented, and maintained by a team at PUC-Rio,
the Pontifical Catholic University of Rio de Janeiro in Brazil. Lua
was born and raised in Tecgraf, the Computer Graphics Technology
Group of PUC-Rio, and is now housed at Lablua. Both Tecgraf and
Lablua are laboratories of the Department of Computer Science of
What's in a name?
"Lua" (pronounced LOO-ah) means "Moon" in Portuguese. As such, it is
neither an acronym nor an abbreviation, but a noun. More
specifically, "Lua" is a name, the name of the Earth's moon and the
name of the language. Like most names, it should be written in lower
case with an initial capital, that is, "Lua". Please do not write it
as "LUA", which is both ugly and confusing, because then it becomes
an acronym with different meanings for different people. So, please,
write "Lua" right!
Lapas adrese: priede.bf.lu.lv/ftp/pub/Programmeeshana/Lua