中文版《Lua程序设计》清晰指南：入门与详解

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"《Lua程序设计：清晰中文版》是一本由巴西PUC-Rio的Roberto Ierusalimschy编写的权威教材，第二版于2010年1月更新。这本书旨在为初学者提供一个易于理解的Lua编程入门指南，适合那些想要探索轻量级脚本语言的开发者。书中详细介绍了Lua语言的基础概念，包括语法、数据类型（如数字、字符串、表等）、控制结构（循环、条件语句）、函数和模块系统。作者以其清晰的表达方式，确保了读者能够快速掌握这种简洁高效的动态语言。特别值得一提的是，这本书还涵盖了Lua在游戏开发、嵌入式系统和网络应用中的实际应用示例，让学习者能够了解其在实际项目中的实用价值。版权方面，书的版权由Roberto Ierusalimschy持有，所有权利受到保护，作者可通过roberto@lua.org进行联系。封面和插图出自Dimaquina之手，而Lua的logo设计则由Alexandre Nako完成。本书采用LaTeX排版，显示了作者的专业素养。在技术细节上，书中强调了Lua没有强制类型检查，以及其强大的元编程能力，这些特性使得Lua在性能与灵活性之间找到了良好的平衡。此外，书中还包含了关于错误处理和调试方法的指导，帮助读者提升问题解决能力。 CIP-Biblioteca do Departamento de Informática, PUC-Rio的记录表明，这本书共分为18章，总计308页，配有25厘米宽的印刷格式，旨在为学习者提供一个全面且易于阅读的学习资源。无论是对于希望深入研究Lua技术的专业人士，还是对脚本语言感兴趣的业余爱好者，这本书都是一个理想的起点。" 请注意，这本教材不仅适合系统学习Lua语言，也适合作为现有项目中Lua技术的参考资料，它在传授知识的同时，也鼓励读者将所学应用于实践，以提升自己的编程技能。

tend to think of Lua as a language speciﬁcally designed for the Web; players of

a speciﬁc game may regard Lua as a language exclusive to that game.

Lua is useful also as a stand-alone language, not only for text-processing

and one-shot little programs, but increasingly for medium-to-large projects, too.

For such uses, the main functionality of Lua comes from libraries. The stan-

dard libraries offer pattern matching and other functions for string handling.

(We may regard the stand-alone language as the embedding of Lua into the

domain of string and text-ﬁle manipulation.) As Lua improves its support for li-

braries, there has been a proliferation of external packages. The Kepler project

(http://www.keplerproject.org), for instance, is a Web development platform

for Lua that offers packages for page generation, database access, LDAP, XML,

and SOAP. The LuaForge site (http://www.luaforge.net) offers a focal point

for many Lua packages.

Finally, there are those programmers that work on the other side of the

bench, writing applications that use Lua as a C library. Those people will

program more in C than in Lua, although they need a good understanding of

Lua to create interfaces that are simple, easy to use, and well integrated with

the language.

This book has much to offer to all these people. The ﬁrst part covers the

language itself, showing how we can explore all its potential. We focus on

different language constructs and use numerous examples to show how to use

them for practical tasks. Some chapters in this part cover basic concepts, such

as control structures, but there are also advanced topics, such as iterators and

coroutines.

The second part is entirely devoted to tables, the sole data structure in Lua.

Its chapters discuss data structures, persistence, packages, and object-oriented

programming. There we will unveil the real power of the language.

The third part presents the standard libraries. This part is particularly

useful for those that use Lua as a stand-alone language, although many other

applications also incorporate all or part of the standard libraries. This part

devotes one chapter to each standard library: the mathematical library, the table

library, the string library, the I/O library, the operating system library, and the

debug library.

Finally, the last part of the book covers the API between Lua and C, for those

that use C to get the full power of Lua. This part necessarily has a ﬂavor quite

different from the rest of the book. There we will be programming in C, not

in Lua; therefore, we will be wearing a different hat. For some readers, the

discussion of the C API may be of marginal interest; for others, it may be the

most relevant part of this book.

About the Second Edition

This book is an updated and expanded version of the ﬁrst edition of Program-

ming in Lua (also known as the PiL book). Although the book structure is virtu-

ally the same, this new edition has substantial new material.

Property of Ian Bloss <ianlinkcd@gmail.com>

xvi Preface

First, I have updated the whole book to Lua 5.1. Of particular relevance is

the chapter about modules and packages, which was mostly rewritten. I also

rewrote several examples to show how to beneﬁt from the new features offered

by Lua 5.1. Nevertheless, I clearly marked features absent from Lua 5.0, so you

can use the book for that version too.

Second, there are several new examples. These examples cover graph rep-

resentation, tab expansion and compression, an implementation for tuples, and

more.

Third, there are two complete new chapters. One is about how to use multiple

states and multiple threads from C; it includes a nice example of how to imple-

ment a multi-process facility for Lua. The other is about memory management

and how to interact with memory allocation and garbage collection.

After the release of the ﬁrst edition of Programming in Lua, several publish-

ers contacted us showing interest in a second edition. In the end, however, we

decided to self publish this second edition, as we did with the ﬁrst one. Despite

the limited marketing, this avenue brings several beneﬁts: we have total con-

trol over the book contents, we have freedom to choose when to release another

edition, we can ensure that the book does not go out of print, and we keep the

full rights to offer the book in other forms.

Other Resources

The reference manual is a must for anyone who wants to really learn a language.

This book does not replace the Lua reference manual. Quite the opposite, they

complement each other. The manual only describes Lua. It shows neither

examples nor a rationale for the constructs of the language. On the other hand,

it describes the whole language; this book skips over seldom-used dark corners of

Lua. Moreover, the manual is the authoritative document about Lua. Wherever

this book disagrees with the manual, trust the manual. To get the manual and

more information about Lua, visit the Lua site at http://www.lua.org.

You can also ﬁnd useful information at the Lua users site, kept by the

community of users at http://lua-users.org. Among other resources, it offers

a tutorial, a list of third-party packages and documentation, and an archive of

the ofﬁcial Lua mailing list. You should check also the book’s web page:

http://www.inf.puc-rio.br/~roberto/pil2/

There you can ﬁnd updated errata, code for some of the examples presented in

the book, and some extra material.

This book describes Lua 5.1, although most of its contents also apply to

Lua 5.0. The few differences between Lua 5.1 and Lua 5.0 are clearly marked in

the text. If you are using a more recent version, check the corresponding manual

for occasional differences between versions. If you are using a version older than

5.0, this is a good time to upgrade.

Property of Ian Bloss <ianlinkcd@gmail.com>

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