Slashdot Mirror
The Perl Cookbook, 2nd Edition
The new recipes cover a number of subjects. One of the prominent themes is how to use perl's new unicode support, as well as the new I/O layers feature. The coverage of web programming has definitely been fleshed out with recipes on XML-RPC, SOAP and so on, plus the new chapter on mod_perl. Also of interest of course are the additional recipes on database access with DBI.
The mod_perl chapter is a good succinct introduction, with some very cute recipes in it (though admittedly a lot of these are also covered in the excellent Mod_perl Developer's Cookbook by Young, Lindner and Kobes out from Sams). For example "Transparently Storing Information in URLs" shows how to embed information in any arbitrary position inside a URL. This quickly shows the kind of things you can do with a PerlTransHandler and a PerlFixupHandler. The chapter closes with what looks like a good introduction to "Template Toolkit", which I would probably be very excited about if I wasn't already familiar with the (also discussed) HTML::Mason.
I really enjoyed reading the XML chapter (a subject I'm less familiar with): I predict that you'll find this to be the fastest way through the XALPHABET XSOUP without drowning. For me, this was almost worth the price of the book.
Very little has been removed (hence the page count has gone from 757 to 927), and where I have been able to find a deletion, there are usually very good reasons for it. For example, the first edition takes the trouble to tell us that qr// was introduced in perl 5.005, but the new edition drops the babble about versions there, because for most of us, anything before 5.6 is now ancient history. However, I do miss this particular irrelevant parenthetic aside that's been deleted now:
Remember that the opposite of read is not write but print, although oddly enough, the opposite of sysread actually is syswrite. (split and join are opposites, but there's no speak to match listen, no resurrect for kill, and no curse for bless.)(p.295, first edition, compare to p.323, second edition.)
In general, it's difficult to think of anything seriously wrong with the Perl Cookbook. I might suggest that in some places they fall into the trap of talking about all the ways to do it, rather than just the best ways, (e.g. recipe 7.5 "Storing Filehandles into Variables" seems a bit complicated).
And maybe there are some slight problems with order of presentation, as with the new perl 5.8 feature of "I/O Layers", which is mentioned a few times before it's finally discussed in the beginning of Chapter 8 (though really, it's amazing that there aren't more problems like this: this is supposed to be reference work, and yet it usually works well as a tutorial also).
I've got one big complaint about the 2nd edition though: they changed the numbering of existing recipes! I've been writing code with comments like
# Schwartzian transform. See Perl Cookbook, recipe 4.15and now it turns out I should've been specifying an edition number also. Please: "Cookbook" authors, come up with a numbering scheme that remains invariant with new editions... if you can't always just append to the end of the chapter, there's nothing wrong with tacking another dotted decimal on the end. We're programmers, we can handle it.
And speaking of the "Schwartzian transform" that recipe has a very clear, self-explanatory name "Sorting a List by Computable Field", but in the first edition, there was also a footnote explaining that many people call this the Schwartzian Transform, named after Randall Schwartz, who invented the technique. With this second edition, that footnote has been quietly dropped. Guys, if you're going to carry on a feud, this is really not the way to do it. It just makes you look bad.
O'Reilly's perl.com site has a series of articles by the authors, featuring some recipes from the book:
Appendix: New recipes and examples (not including the two new chapters):
- Using Named Unicode Characters
- Treating Unicode Combined Characters as Single Characters
- Canonicalizing Strings with Unicode Combined Characters
- Treating a Unicode String as Octets
- Properly Capitalizing a Title or Headline
- Constant Variables
- Implementing a Sparse Array
- Creating a Hash with Immutable Keys or Values
- Matching Nested Patterns
- Writing a Subroutine That Takes Filehandles as Built-ins Do
- Storing Multiple Files in the DATA Area
- Reading an Entire Line Without Blocking
- Treating a File as an Array
- Setting the Default I/O Layers
- Reading or Writing Unicode from a Filehandle
- Converting Microsoft Text Files into Unicode
- Comparing the Contents of Two Files
- Pretending a String Is a File
- Working with Symbolic File Permissions Instead of Octal Values
- Writing a Switch Statement
- Coping with Circular Data Structures Using Weak References
- Program: Outlines
- Overriding a Built-in Function in All Packages
- Customizing Warnings
- Writing Extensions in C with Inline::C
- Cloning Constructors
- Copy Constructors
- Saving Query Results to Excel or CSV
- Escaping Quotes
- Dealing with Database Errors
- Repeating Queries Efficiently
- Building Queries Programmatically
- Finding the Number of Rows Returned by a Query
- Using Transactions
- Viewing Data One Page at a Time
- Querying a CSV File with SQL
- Using SQL Without a Database Server
- Graphing Data
- Thumbnailing Images
- Adding Text to an Image
- Program: graphbox
- Turning Signals into Fatal Errors
- Multitasking Server with Threads
- Writing a Multitasking Server with POE
- Accessing an LDAP Server
- Sending Attachments in Mail
- Extracting Attachments from Mail
- Writing an XML-RPC Server
- Writing an XML-RPC Client
- Writing a SOAP Server
- Writing a SOAP Client
- Program: rfrm
- Using Cookies
- Fetching Password-Protected Pages
- Fetching https:// Web Pages
- Resuming an HTTP GET
- Parsing HTML
- Extracting Table Data
You can purchase The Perl Cookbook, 2nd Edition from bn.com. Slashdot welcomes readers' book reviews -- to see your own review here, read the book review guidelines, then visit the submission page.
So, I've got perl scripts which may need to work on Unicode and non-ascii character sets somtime in the future. Today, I just test them with UTF-8, and it seems to work, but who knows if they really do work on those funny character sets? I can't read Kanji or other non-ascii characters. How can I test to see if they do work? Ideally, I'd like to have an xterm-like window that uses my standard keyboard to generate analogs to all my ASCII characters, but with some test encoding that puts them into some 16 bit character set range. This way, I can make sure that since we've gone to all this work to add Unicode support into our scripting languages that it does indeed work. Does anyone know how to test this?
As you would have guessed if you heard me speak in 2000, I'm not the biggest XML user. I've mellowed since then, but I still don't do a lot of XML hacking. (One of the spare-time hacking things I've while here at O'Reilly, though, is to get our internal database of "what books are at what stage" into XML for easy grepping and reuse).
Of all my work in the 2nd edition of the Cookbook, the XML chapter is the one I'm proudest of. I'm really glad you like it. Thanks!
--Nat