24 of 24 people found the following review helpful:
3.0 out of 5 stars
Would have expected more, December 28, 2005
This review is from: Pro Perl Parsing (Hardcover)
The first 108 pages of "Pro Perl Parsing" deal with basic parsing concepts and give examples on how to use a CPAN module to define parsers. It's not quite accurate at times, though: The author uses the terms 'precedence' and 'associativity' interchangably, although these are orthogonal concepts. And the parser on page 82 has a design flaw (hint: try parsing "(5*(3+4))+1)", which yields 40, ouch!).
Then come 30 pages with a manual-page style explanation of Damian Conway's Parse::RecDescent module, along with some interesting tidbits here and there.
However, I would have expected to read a better explanation of the underlying parsing theory, like a distilled and simplified version of the "Dragon" book (Aho, "Compilers"). I would have liked to read how to write a custom parser from scratch in Perl, like in Mark Jason Dominus' "Higher Order Perl". Also, I would have expected more practical examples on how to tackle common parsing problems.
However, the second half of the book starts with an explanation of the HTML language. We get to know how titles and lists and links are done in HTML. Then we learn how to fetch web pages with Perl. Also, we learn about web services via SOAP and XML-RPC, about formatting output in Perl and are getting a chapter on "data mining". These topics aren't related to "parsing" at all, though.
There's an example on page 202 on how to parse command line arguments by lumping them all together to form a single string and then firing up an expensive recursive descent parser to tear them apart. Experienced Perl programmers would solve this common problem elegantly in a single line of Perl, using the Getopt::Std module.
So, I'm somewhat ambivalent on this book. Since there's not many books on Perl parsing, I was excited about it, but I was somewhat disappointed by the lack of depth, accuracy, and the filler-style second half of the book. I would have liked to read more about parsing in Perl and less about how to use CPAN modules dealing with parsing-related topics. Had the book maintained a strong focus on plain "parsing", it could have been a slam-dunk five-star. So, it's only three -- worth reading, but not a potential classic.
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5 of 6 people found the following review helpful:
5.0 out of 5 stars
An excellent primer on parsing, September 4, 2005
This review is from: Pro Perl Parsing (Hardcover)
This is a great book on parsing for novices that goes over the different kinds of parsing tasks, looks at the different tools available, and gives numerous examples. It's also a great book for experienced Perl programmers who have limited experience with parsing, other than Text::CSV_XS and regexes. The most time is spent on Parse::RecDescent, the most popular parsing module for Perl, but it doesn't give others, like Text::Balanced and Parse::YAPP, short shrift. Later, he gives excellent help on parsing HTML and XML, and in the final chapters he introduces text and data mining. Quite an education!
So whether you have to parse structured or semi-structured text, you want to build yourself a little command language, you need to scan gobs of web or other documents for information, or have any parsing task where your regexes are just getting out of hand, then check out this book.
P.S. I don't know what psychoactives the first reviewer had consumed, but this book is not about "medical-text processing in particular," or even generally. It could be used for that, but it is a general, intermediate-to-advanced book on parsing with Perl. If you were thinking of buying it, it is what you think it is, and not what Dr. Oscar thinks it is.
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4 of 5 people found the following review helpful:
3.0 out of 5 stars
A bit disappointing, March 11, 2006
This review is from: Pro Perl Parsing (Hardcover)
Well, not was I was looking for. I would like to find something more than a description of what modules do, and that's mostly what it does. The last chapter is a smorgasbord of light descriptions of modules such as Text::Balanced, which have little or nothing to do with parsing, or with pro, and the chapter on XML processing looks like just a filler with little to add to the rest of the book or to the literature on XML+Perl.
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