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Ebook Download Extending and Embedding Perl, by Tim Jenness Simon Cozens
Ebook Download Extending and Embedding Perl, by Tim Jenness Simon Cozens
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Extending and Embedding Perl, by Tim Jenness Simon Cozens
Ebook Download Extending and Embedding Perl, by Tim Jenness Simon Cozens
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Review
"A masterpiece that will keep its value for years." -- The Perl Journal"Everything related to Perl internals is found here . . . organized well, and is fine as a reference work." -- The Perl Review"Great for learning and great for reference, which is a combination other books often fail to achieve." -- Perlmonks"Indispensable in gaining a good foothold on using Perl in, from, and around C." -- Slashdot.org
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About the Author
Simon Cozens is an Open Source programmer and author. He has released over a hundred Perl modules including Email::Simple, Mail::Audit, Maypole, Plucene, and B::Generate. He's the co-author of Beginning Perl (Wrox) and Extending and Embedding Perl (Manning) and was the managing editor of Perl.com from 2001 to 2004. A graduate in Japanese from Oxford University, he now lives in Wales and enjoys Japanese and Greek food, bizarre music and fine typography.
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Product details
Paperback: 384 pages
Publisher: Manning Publications (August 2002)
Language: English
ISBN-10: 1930110820
ISBN-13: 978-1930110823
Product Dimensions:
7.4 x 0.8 x 9.3 inches
Shipping Weight: 1.4 pounds (View shipping rates and policies)
Average Customer Review:
4.4 out of 5 stars
8 customer reviews
Amazon Best Sellers Rank:
#1,591,976 in Books (See Top 100 in Books)
I'm a die-hard Perl guy. I've been using the language for years, and continue to learn more things. I just love it. I don't use all the language features all of the time, but I use most of them some of the time.This book has only made my use of Perl more enjoyable, because I can now solve even more problems in the language. Basically, I work with very large data sets (GB) and I like to have quick and easy access to them, in memory. Perl's datastructures are wonderfully flexible and surprisingly fast, but they do take up a lot of space. Because of that, I've moved certain kinds of data handling to C routines (where the data live, as well) and created functions that allow me to access those data structures from Perl. I continue to be able to write most of my app in Perl, but the really tight bits get moved to C, or some language that can "extern C."The other nice thing about this book is that it gives you a nice picture of how Perl actually works under the hood. I guess I could have just looked at Perl source, but this book gets you thinking a bit about how and why Perl is the way it is.Sadly, moving complex data from Perl types to some complex types you created in C is still somewhat tricky. XS is not for the faint of heart. But there's not much to be done about that. The book makes it about as palatable as possible!
I got a copy of this book in one of the Israel Perl Mongers meetings ([...] to read and review it.The topic is useful as this subject was considered as voodoo done by Perl hackers and "mappers of the Perl internals". I suppose you can say this claim is not true anymore, because this book collects the know-how from the perldocs, the newsgroups, the camel book (and other resources) and the personal experience of authors of the book.Finally, you don't have to pick up small pieces of information about this subject in many places as people did prior to this book. What one would do, if one wanted to learn how to extend Perl or embed Perl before this book was available was doing one or more of the following: * Read relevant small parts of the Camel book (preferably the recent edition rather than the 1st or 2nd) and "Advanced Perl Programming" (which is rather old, and only touches this matters). This would give you some idea about Perl internals and perhaps some clues about XS, but that's about it. * browse through newsgroups, mail archives and mailing lists to look for clues, and ask expert users, which usually, are not polite to answer newbies questions about such matters. * figure out some cryptic (though, personally, I like them) incomplete (examples-wise) perldocs such as: perlembed, perldebguts, perlxstut, perlxs, perlclib, perlguts, perlcall, perlapi, perlintern, perliol, perlapio, perlhack* locate and dig into available CPAN module using this technology.I think reading one book, with common terminology and many examples, is better than doing one or more of the above.The book starts with an introduction of C for Perl programmers. It is very short and in my opinion not so accurate (due to its shortness), but since this should be a short introduction - it lives up to the promise. You can write a lot more than a "hello world" program after reading this short chapter, and you get a bonus, how to compile on gcc (gcc is ANSI-C and is available for all platforms), which is a wise idea. Perl programmers might be a bit disappointed to discover how much code and how complicated code you need to write in C to produce something that does the same as any Perl oneliner. The third chapter about Advanced C is a very good continuation to this introduction, especially, becuase the authors can assume you know some Perl (although I'm not sure they do). As someone giving lectures in "introduction to Computer Science, C language", I was tempted to borrow several very nice examples and explenations from this chapter. And I might also do that :-)The next chapter explains how C code can be incorporated into a Perl Module and more generally into a CPAN package of a Perl module. This is very useful. Many resources (including books), focus on writing C/Perl code, and they say nothing or next to nothing about packaging (what you should do in order to make sure others can use your code, what you can and can't assume about the target system, etc.)The fourth chapter is a useful cover of Perl variable types. This is somehting you could find in the "camel book", you can also find this in the (rather old) "Advanced Perl Programming", and of course in perldocs - but having it in one place, in order with examples and explenations is a real joy. Now you can figure it our reading one thing, and if you feel you want more, go to the perldocs.Explaining Perl API, XS and advanced XS, alternatives to XS explain how you can add to your Perl programs some code (or programs or libraries) in C. I, personally wanted to have a module in Perl that gives interface to a data structure. Since the implementation I had is in C and it is tested and verified, I wanted to have a Perl module which exports the functionality, and offers a perl-oriented interface, without needing to reimplement the data structure in Perl. These book chapters made all the difference, and with the knowlede in chapter 2, I can now finish this, and after doing my testing, put it on CPAN. Isn't that great?!If you are interested in doing the opposite, write Perl in C code, you can learn it in chapter 8. And if theory does not meet practice, you can read chapter 9 (and also try it out yourself) which presents a case study. Pretty useful stuff.For people who are taking their first steps, the material so far is more than enough. But once you go deeper you want to know more about how to do more complicated stuff, and how stuff actually works. Chapter 10 which introduces you to the Perl internals is just what you would be looking for. Chapter 11 will be the tour into the depts, teaching you some perl hacking, i.e. how to alter Perl's behaviour.The indices are useful, though can be found (though, not in similar format) elsewhere.To sum this review, I loved the book. I wish I could take more time to practice what I read there thoroughly. I will surely get a copy of this book to have it on my bookshelf, and when the need comes, on my desk.
Extending and Embedding Perl is as it boldly states on the cover: "The definitive guide to XS, embedding, and the Perl internals". This book is well organized and information dense. One could spend days sifting through the available perlapi, perlcall, perlembed, perlguts perlxs, perlxstut, and h2xs documentation. After which you'll probably understand very well references to nethack's "You are in a maze of twisty little passages all alike". Or you could get yourself a copy of this book and find your way out of the maze.Most of the available documentation on extending and embedding perl is written from the prospective of the core perl developers for core perl developers. This book is written for advanced Perl programmers who for whatever reason need or wish to peer into that netherworld between Perl, C, and the glue that interface Perl with other languages. It is a deliberate thorough guide led by authors that are both extremely knowledgeable and also capable of communicating that knowledge.While it would greatly reduce the learning curve, no prior knowledge of C is required to read this book. This is a surprising claim and while it won't be easy, this reader is proof that someone with little true knowledge of C can in fact read and for the most part comprehend what the authors wish to convey.There are clearly areas for improvement. Things like NULL being used throughout chapter 3, only to finally be defined later in a footnote in chapter 4. And other cases of terms being used before they are explained. Things that leave the reader juggling unnecessarily until the information is provided that lets understanding fall into place. But for the most part, if you are a competent juggler and are patient your questions will eventually be answered. You won't walk away a C programmer, but you will learn enough to solve the problems which led you to consider reading this book in the first place.One thing I liked very much about the layout of the book is how it switches back between presenting sections on C programming and Perl. The authors revisit C each time it is necessary to understand the next Perl internals topic. Those that are learning C or need the review receive the relevant information just before it is required.Over the course of the book, you'll learn about interfacing from Perl to C and C back to Perl. For those that must plug references to Tolkien in things Perl... you can go back and rephase that into an appropriate reference to Bilbo's book "There and Back Again". You'll also learn the perl api, data structures for core variable types, and how to work with scalars, arrays, hashes, strings, regular expressions, file handles, typeglobs, objects, callbacks and PDL with C and C++. And there is even mention of working with Fortran, Java, and more esoteric alternatives.The book finishes with an in depth look at Perl internals: the parser, tokenizer, op code trees, execution, and compiler. And closes with a discussion of the Perl development process: How it may be monitored and participated in.What's missing? Detailed coverage of the I/O subsystem and the regular expression engine. I.e., topics which might themselves make for a good book. There was also light coverage on things like scratchpads. There were times while reading when I didn't know whether the issue being discussed was fully covered or curtailed. But you will certainly find better coverage of the issues in this book than elsewhere. This is an impressive book. I hope it will greatly influence the way Perl6 internals are documented.
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