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从一个Perl爱好者到一个Perl程序员。《Intermediate Perl》将教您如何把Perl作为编程语言来使用，而不仅只是作为一种脚本语言。

Perl是一种灵活多变、功能强大的编程语言，可以应用在从系统管理到网络编程再到数据库操作等很多方面。人们常说Perl让容易的事情变简单、让困难的事情变得可行。《Intermediate Perl》正是关于如何将技能从处理简单任务跃升到胜任困难任务的书籍。

本书提供对Perl中级编程优雅而仔细的介绍。由畅销的《学习Perl》作者所著，本书提供了《学习Perl》没有涵盖的内容。

主题包括：

包和命名空间

引用和作用域

操作复杂数据结构

面向对象编程

编写和使用模块

测试Perl代码

为CPAN贡献代码

参照《学习Perl》的成功编排格式，本书的每一章都短小到可以在一到两个小时内读完，并在结束时提供一系列练习题帮助您实践刚刚学到的知识。使用本书，您只需熟悉《学习Perl》的内容并有更进一步学习的决心。

对于不同的人而言Perl是一种不同的语言。对于某些人而言，它只是快速编写脚本的工具，但对于另外的人来说，它就是一种功能完整的面向对象语言。Perl被应用在各种任务当中，从对文本文件进行快速全局替换，到计算需要数星期才能完成处理的海量复杂科学数据。您的使用决定Perl的面貌。但不论您将Perl应用在什么方面，本书将帮助您让应用更加有效、高效和优雅。

《Intermediate Perl》是为了把Perl作为一种编程语言来学习，而不仅是为了写脚本而著。这本书把Perl爱好者变为Perl程序员。

Foreword

Preface

1. Introduction

　What Should You Know Already?

　What About All Those Footnotes?

　What's with the Exercises?

　What If I'm a Perl Course Instructor?

2. Intermediate Foundations

　List Operators

　Trapping Errors with eval

　Dynamic Code with eval

　Exercises

3. Using Modules

　The Standard Distribution

　Using Modules

　Functional Interfaces

　Selecting What to Import

　Object-Oriented Interfaces

　A More Typical Object-Oriented Module: Math::Biglnt

　The Comprehensive Perl Archive Network

　Installing Modules from CPAN

　Setting the Path at the Right Time

　Exercises

4. Introduction to References

　Performing the Same Task on Many Arrays

　Taking a Reference to an Array

　Dereferencing the Array Reference

　Getting Our Braces Off

　Modifying the Array

　Nested Data Structures

　Simplifying Nested Element References with Arrows

　References to Hashes

　Exercises

5. References and Scoping .

　More Than One Reference to Data

　What If That Was the Name?

　Reference Counting and Nested Data Structures

　When Reference Counting Goes Bad

　Creating an Anonymous Array Directly

　Creating an Anonymous Hash

　Autovivification

　Autovivification and Hashes

　Exercises

6. Manipulating Complex Data Structures

　Using the Debugger to View Complex Data

　Viewing Complex Data with Data: :Dumper

　YAML

　Storing Complex Data with Storable

　Using the map and grep Operators

　Applying a Bit of Indirection

　Selecting and Altering Complex Data

　Exercises

7. Subroutine References

　Referencing a Named Subroutine

　Anonymous Subroutines

　Callbacks

　Closures

　Returning a Subroutine from a Subroutine

　Closure Variables as Inputs

　Closure Variables as Static Local Variables

　Exercise

8. Filehandle References

　The Old Way

　The Improved Way

　The Even Better Way

　IO::Handle

　Directory Handle References

　Exercises

9. Practical Reference Tricks

　Review of Sorting

　Sorting with Indices

　Sorting Efficiently

　The Schwartzian Transform

　Multi-Level Sort with the Schwartzian Transform

　Recursively Defined Data

　Building Recursively Defined Data

　Displaying Recursively Defined Data

　Exercises

10. Building Larger Programs

　The Cure for the Common Code

　Inserting Code with eval

　Using do

　Using require

　require and @INC

　The Problem of Namespace Collisions

　Packages as Namespace Separators

　Scope of a Package Directive

　Packages and Lexicals

　Exercises

11. Introduction to Objects

　If We Could Talk to the Animals...

　Introducing the Method Invocation Arrow

　The Extra Parameter of Method Invocation

　Calling a Second Method to Simplify Things

　A Few Notes About @ISA

　Overriding the Methods

　Starting the Search from a Different Place

　The SUPER Way of Doing Things

　What to Do with @_

　Where We Are So Far

　Exercises

12. Objects with Data

　A Horse Is a Horse, of Course of Course--or Is It?

　Invoking an Instance Method

　Accessing the Instance Data

　How to Build a Horse

　Inheriting the Constructor

　Making a Method Work with Either Classes or Instances

　Adding Parameters to a Method

　More Interesting Instances

　A Horse of a Different Color

　Getting Our Deposit Back

　Don't Look Inside the Box

　Faster Getters and Setters

　Getters That Double as Setters

　Restricting a Method to Class-Only or Instance-Only

　Exercise

13. Object Destruction

　Cleaning Up After Yourself

　Nested Object Destruction

　Beating a Dead Horse

　Indirect Object Notation

　Additional Instance Variables in Subclasses

　Using Class Variables

　Weakening the Argument

　Exercise

14. Some Advanced Object Topics

　UNIVERSAL Methods

　Testing Our Objects for Good Behavior

　AUTOLOAD as a Last Resort

　Using AUTOLOAD for Accessors

　Creating Getters and Setters More Easily

　Multiple Inheritance

　Exercises

15. Exporter

　What use Is Doing

　Importing with Exporter

　@EXPORT and @EXPORT_OK

　%EXPORT_TAGS

　Exporting in a Primarily OO Module

　Custom Import Routines

　Exercises

16. Writing a Distribution

　There's More Than One Way To Do It

　Using h2xs

　Embedded Documentation

　Controlling the Distribution with Makefile.PL

　Alternate Installation Locations (PREFIX=...)

　Trivial make test

　Trivial make install

　Trivial make dist

　Using the Alternate Library Location

　Exercise

17. Essential Testing

　More Tests Mean Better Code

　A Simple Test Script

　The Art of Testing

　The Test Harness

　Writing Tests with Test: :More

　Testing Object-Oriented Features

　A Testing To-Do List

　Skipping Tests

　More Complex Tests (Multiple Test Scripts)

　Exercise

18. Advanced Testing

　Testing Large Strings

　Testing Files

　Testing STDOUT or STDERR

　Using Mock Objects

　Testing POD

　Coverage Testing

　Writing Your Own Test: Modules

　Exercises

19. Contributing to CPAN

　The Comprehensive Perl Archive Network

　Getting Prepared

　Preparing Your Distribution

　Uploading Your Distribution

　Announcing the Module

　Testing on Multiple Platforms

　Consider Writing an Article or Giving a Talk

　Exercise

Appendix: Answers to Exercises

Index

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The Skipper and Gilligan are having a conversation:

sub skipper_greets {

my $person = shift;

print "Skipper: Hey there, $person!n";

}

sub gilligan_greets {

my $person = shift;

if ($person eq "Skipper") {

print "Gilligan: Sir, yes, sir, $person!n";

} else {

print "Gilligan: Hi, $person!n";

}

}

skipper_greets("Gilligan");

gilligan_greets("Skipper");

This results in:

Skipper: Hey there, Gilligan!

Gilligan: Sir, yes, sir, Skipper!

So far, nothing unusual has happened. Note, however, that Gilligan has two different behaviors, depending on whether he's addressing the Skipper or someone else.

Now, have the Professor walk into the hut. Both of the Minnow crew greet the newest participant:

skipper_greets('Professor');

gilligan_greets('Professor');

which results in:

...

13.7. Weakening the Argument

The %REGISTRY variable also holds a reference to each animal. So even if we toss away the containing variables, for instance by letting them go out of scope:

{

my @cows = map Cow->named($_), qw(Bessie Gwen);

my @horses = map Horse->named($_), ('Trigger', 'Mr. Ed');

my @racehorses = RaceHorse->named('Billy Boy');

}

print "We've seen:n", map(" $_n", Animal->registered);

print "End of program.n";

we'll still see the same result. The animals aren't destroyed, even though none of the code is holding the animals. At first glance, it looks like we can fix this by altering the destructor:

## in Animal

sub DESTROY {

my $self = shift;

print '[', $self->name, " has died.]n";

delete $REGISTRY{$self};

}

## this code is bad (see text)

But this still res...

编辑推荐

“这是本多么闪耀夺目的Perl书籍啊……这本书为那些渴望提高技能或者提升职业生涯的Perl程序员填补了空白。更为重要的是，看这本书有一种向大师学习的感觉。”

　　　　　　　　　　　　——Russell J.T. Dyer, UnixReview.com

书摘插图

书籍介绍

从一个Perl爱好者到一个Perl程序员。《Intermediate Perl》将教您如何把Perl作为编程语言来使用，而不仅只是作为一种脚本语言。

Perl是一种灵活多变、功能强大的编程语言，可以应用在从系统管理到网络编程再到数据库操作等很多方面。人们常说Perl让容易的事情变简单、让困难的事情变得可行。《Intermediate Perl》正是关于如何将技能从处理简单任务跃升到胜任困难任务的书籍。

《Intermediate Perl》提供对Perl中级编程优雅而仔细的介绍。由畅销的《学习Perl》作者所著，本书提供了《学习Perl》没有涵盖的内容。

主题包括：

包和命名空间

引用和作用域

操作复杂数据结构

面向对象编程

编写和使用模块

测试Perl代码

为CPAN贡献代码

参照《学习Perl》的成功编排格式，本书的每一章都短小到可以在一到两个小时内读完，并在结束时提供一系列练习题帮助您实践刚刚学到的知识。使用本书，您只需熟悉《学习Perl》的内容并有更进一步学习的决心。

对于不同的人而言Perl是一种不同的语言。对于某些人而言，它只是快速编写脚本的工具，但对于另外的人来说，它就是一种功能完整的面向对象语言。Perl 被应用在各种任务当中，从对文本文件进行快速全局替换，到计算需要数星期才能完成处理的海量复杂科学数据。您的使用决定Perl的面貌。但不论您将 Perl应用在什么方面，本书将帮助您让应用更加有效、高效和优雅。

《Intermediate Perl》是为了把Perl作为一种编程语言来学习，而不仅是为了写脚本而著。这本书把Perl爱好者变为Perl程序员。