Intermediate Perl

, by Schwartz, Randal L.; Foy, Brian D.; Phoenix, Tom

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ISBN: 9781449393090 | 1449393098
Cover: Paperback
Copyright: 8/13/2012

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Get a clear roadmap for improving your skills with Intermediate Perl, and gain working knowledge of Perl's objects, references, and modules-ingredients that make the language so versatile and effective. Written by the authors of the bestselling Llama book, Learning Perl, and updated for Perl 5.14, this book offers a gentle but thorough introduction to intermediate programming in Perl. Each chapter is small enough to be read in just an hour or two, ending with a series of exercises to help you practice what you've learned. If you're familiar with the material in Learning Perl and have the ambition learn more, this book will take you much further into Perl's capabilities. Topics include: Packages and namespaces References and scoping, including regular expression references Manipulating complex data structures Object-oriented programming Writing and using modules Testing Perl code Contributing to CPAN

Foreword	p. xi
Preface	p. xiii
Introduction	p. 1
What Should You Know Already?	p. 2
strict and warnings	p. 2
Perl v5.14	p. 3
A Note on Versions	p. 4
What About All Those Footnotes?	p. 4
What's With the Exercises?	p. 4
How to Get Help	p. 5
What If I'm a Perl Course Instructor?	p. 5
Exercises	p. 6
Using Modules	p. 7
The Standard Distribution	p. 7
Exploring CPAN	p. 8
Using Modules	p. 9
Functional Interfaces	p. 10
Selecting What to Import	p. 11
Object-Oriented Interfaces	p. 12
A More Typical Object-Oriented Module: Math::BigInt	p. 12
Fancier Output with Modules	p. 13
What's in Core?	p. 14
The Comprehensive Perl Archive Network	p. 15
Installing Modules from CPAN	p. 16
CPANminus	p. 17
Installing Modules Manually	p. 17
Setting the Path at the Right Time	p. 18
Setting the Path Outside the Program	p. 21
Extending @INC with PERL5LIB	p. 21
Extending @INC on the Command Line	p. 22
local::lib	p. 22
Exercises	p. 23
Intermediate Foundations	p. 25
List Operators	p. 25
List Filtering with grep	p. 26
Transforming Lists with map	p. 28
Trapping Errors with eval	p. 29
Dynamic Code with eval	p. 31
The do Block	p. 32
Exercises	p. 33
Introduction to References	p. 35
Doing the Same Task on Many Arrays	p. 35
PeGS: Perl Graphical Structures	p. 37
Taking a Reference to an Array	p. 38
Dereferencing the Array Reference	p. 41
Getting Our Braces Off	p. 42
Modifying the Array	p. 43
Nested Data Structures	p. 44
Simplifying Nested Element References with Arrows	p. 45
References to Hashes	p. 47
Checking Reference Types	p. 50
Exercises	p. 52
References and Scoping	p. 53
More than One Reference to Data	p. 53
What If That Was the Name?	p. 54
Reference Counting and Nested Data Structures	p. 55
When Reference Counting Goes Bad	p. 57
Creating an Anonymous Array Directly	p. 59
Creating an Anonymous Hash	p. 61
Autovivification	p. 63
Autovivification and Hashes	p. 66
Exercises	p. 68
Manipulating Complex Data Structures	p. 71
Using the Debugger to View Complex Data	p. 71
Viewing Complex Data with Data::Dumper	p. 75
Other Dumpers	p. 77
Marshalling Data	p. 78
Storing Complex Data with Storable	p. 80
YAML	p. 85
JSON	p. 85
Using the map and grep Operators	p. 86
Applying a Bit of Indirection	p. 86
Selecting and Altering Complex Data	p. 88
Exercises	p. 90
Subroutine References	p. 91
Referencing a Named Subroutine	p. 91
Anonymous Subroutines	p. 96
Callbacks	p. 97
Closures	p. 98
Returning a Subroutine from a Subroutine	p. 100
Closure Variables as Inputs	p. 103
Closure Variables as Static Local Variables	p. 104
state Variables	p. 105
Finding Out Who We Are	p. 107
Enchanting Subroutines	p. 108
Dumping Closures	p. 111
Exercise	p. 112
Filehandle References	p. 115
The Old Way	p. 115
The Improved Way	p. 116
Filehandles to Strings	p. 118
Processing Strings Line by Line	p. 119
Collections of Filehandles	p. 120
IO::Handle and Friends	p. 121
IO::File	p. 121
IO::Scalar	p. 122
IO::Tee	p. 123
IO::Pipe	p. 124
IO::Null and IO::Interactive	p. 125
Directory Handles	p. 126
Directory Handle References	p. 126
Exercises	p. 127
Regular Expression References	p. 129
Before Regular Expression References	p. 129
Precompiled Patterns	p. 131
Regular Expression Options	p. 132
Applying Regex References	p. 132
Regexes as Scalars	p. 133
Build Up Regular Expressions	p. 136
Regex-Creating Modules	p. 137
Using Common Patterns	p. 137
Assembling Regular Expressions	p. 139
Exercises	p. 140
Practical Reference Tricks	p. 141
Fancier Sorting	p. 141
Sorting with Indices	p. 143
Sorting Efficiently	p. 144
The Schwartzian Transform	p. 145
Multilevel Sort with the Schwartzian Transform	p. 147
Recursively Defined Data	p. 147
Building Recursively Defined Data	p. 149
Displaying Recursively Defined Data	p. 152
Avoiding Recursion	p. 153
The Breadth-First Solution	p. 154
Exercises	p. 156
Building Larger Programs	p. 159
The Cure for the Common Code	p. 159
Inserting Code with eval	p. 160
Using do	p. 161
Using require	p. 163
The Problem of Namespace Collisions	p. 164
Packages as Namespace Separators	p. 165
Scope of a Package Directive	p. 167
Packages and Lexicals	p. 168
Package Blocks	p. 169
Exercises	p. 170
Creating Your Own Perl Distribution	p. 173
Perl's Two Build Systems	p. 173
Inside Makefile.PL	p. 174
Inside Build.PL	p. 175
Our First Distribution	p. 176
h2xs	p. 176
Module::Starter	p. 177
Custom Templates	p. 178
Inside Your Perl Distribution	p. 178
The META File	p. 180
Adding Additional Modules	p. 181
Inside a Module	p. 182
Plain Ol' Documentation	p. 184
Pod Command Paragraphs	p. 185
Pod Paragraphs	p. 186
Pod Formatting Codes	p. 186
Checking the Pod Format	p. 187
The Module Code	p. 187
Module Building Summary	p. 188
Creating a Module::Build Distribution	p. 188
Creating a ExtUtils::Makemaker Distribution	p. 189
Exercises	p. 189
Introduction to Objects	p. 191
If We Could Talk to the Animals…	p. 191
Introducing the Method Invocation Arrow	p. 193
The Extra Parameter of Method Invocation	p. 194
Calling a Second Method to Simplify Things	p. 195
A Few Notes About @ISA	p. 197
Overriding the Methods	p. 198
Starting the Search from a Different Place	p. 200
The SUPER Way of Doing Things	p. 200
What to Do with @_	p. 201
Where We Are	p. 201
Our Barnyard Summary	p. 202
Exercises	p. 203
Introduction to Testing	p. 205
Why Should We Test?	p. 205
The Perl Testing Process	p. 206
Test Anywhere Protocol	p. 206
The Art of Testing	p. 208
A Test Example	p. 209
The Test Harness	p. 210
The Standard Tests	p. 211
Checking that Modules Compile	p. 212
The Boilerplate Tests	p. 213
The Pod Tests	p. 216
Adding Our First Tests	p. 217
Measuring Our Test Coverage	p. 220
Subroutine Coverage	p. 221
Statement Coverage	p. 221
Branch Coverage	p. 221
Conditional Coverage	p. 222
Exercises	p. 222
Objects with Data	p. 225
A Horse Is a Horse, of Course of Course-Or Is It?	p. 225
Invoking an Instance Method	p. 227
Accessing the Instance Data	p. 228
How to Build a Horse	p. 228
Inheriting the Constructor	p. 229
Making a Method Work with Either Classes or Instances	p. 230
Adding Parameters to a Method	p. 230
More Interesting Instances	p. 231
A Horse of a Different Color	p. 232
Getting Our Deposit Back	p. 233
Don't Look Inside the Box	p. 234
Faster Getters and Setters	p. 235
Getters that Double as Setters	p. 236
Restricting a Method to Class Only or Instance Only	p. 236
Exercise	p. 237
Some Advanced Object Topics	p. 239
UNIVERSAL Methods	p. 239
Testing Our Objects for Good Behavior	p. 240
The Last Resort	p. 242
Using AUTOLOAD for Accessors	p. 243
Creating Getters and Setters More Easily	p. 244
Multiple Inheritance	p. 246
Exercises	p. 247
Exporter	p. 249
What use Is Doing	p. 249
Importing with Exporter	p. 250
@EXPORT and @EXPORT_OK	p. 251
Grouping with %EXPORT_TAGS	p. 252
Custom Import Routines	p. 254
Exercises	p. 256
Object Destruction	p. 257
Cleaning Up After Ourselves	p. 257
Nested Object Destruction	p. 259
Beating a Dead Horse	p. 262
Indirect Object Notation	p. 263
Additional Instance Variables in Subclasses	p. 265
Using Class Variables	p. 267
Weakening the Argument	p. 268
Exercise	p. 270
Introduction to Moose	p. 273
Making Animals with Moose	p. 273
Roles Instead of Inheritance	p. 276
Default Values	p. 277
Constraining Values	p. 278
Wrapping Methods	p. 279
Read-Only Attributes	p. 281
Improving the Race Horse	p. 281
Further Study	p. 283
Exercises	p. 283
Advancing Testing	p. 285
Skipping Tests	p. 285
Testing Object-Oriented Features	p. 286
Grouping Tests	p. 287
Testing Large Strings	p. 288
Testing Files	p. 289
Testing STDOUT or STDERR	p. 290
Using Mock Objects	p. 293
Writing Our Own Test::* Modules	p. 294
Exercises	p. 297
Contributing to CPAN	p. 299
The Comprehensive Perl Archive Network	p. 299
Getting Prepared	p. 299
How PAUSE Works	p. 300
The Indexer	p. 301
Module Maintainers	p. 302
Before We Start Work	p. 303
Preparing the Distribution	p. 303
Create or Update the README	p. 304
Check the Build File	p. 304
Update the Manifest	p. 304
Increase the Version String	p. 306
Test the Distribution	p. 306
Uploading the Distribution	p. 307
Testing on Multiple Platforms	p. 307
Announcing the Module	p. 308
Exercises	p. 308
Appendix: Answers to Exercises	p. 311
Index of Modules in this Book	p. 359
Index	p. 363
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Intermediate Perl

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