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Home > Programming > Application Development > D Cookbook
D Cookbook
D Cookbook

D Cookbook: Discover the advantages of programming in D with over 100 incredibly effective recipes with this book and ebook.

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Profile Icon Adam Ruppe
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D Cookbook

Chapter 2. Phobos – The Standard Library

In this chapter, we will learn how to use the D standard library and explore the language concepts used in the implementation. You will learn the following recipes:

  • Performing type conversions

  • Finding the largest files in a directory

  • Creating a network client and server

  • Using Base64 to create a data URI

  • Generating random numbers

  • Normalizing a string and performing Unicode comparisons

  • Searching with regular expressions

  • Writing a digest utility

  • Using the std.zlib compression

  • Using the std.json module

Introduction

The D standard library, Phobos, provides a variety of modules that do a variety of tasks. This chapter will only cover a portion of its ever-growing capabilities.

Performing type conversions

D is a strongly typed language, which means converting between types often has to be done explicitly. The language's built-in cast operator only works when the types are already mostly compatible, for example int to short, or in cases where the user has defined an opCast function. This doesn't cover the very common need of converting strings to integers and vice versa. That's where Phobos' std.conv module is helpful.

How to do it…

Now it's time to perform type conversions by executing the following steps:

  1. Import std.conv.

  2. Use the to function as follows:

    import std.conv;
auto converted = to!desired_type(variable_to_convert);

    This is pretty simple, and it works for a lot of types.

  3. To convert a string to an integer, use the following line of code:

    auto a = to!int("123"); // a == 123

That's all you have to do!

How it works…

The std.conv.to function strives to be a one-stop shop for type conversions. The to function isn't just one function. It is actually a family of functions...

Finding the largest files in a directory

Suppose you're out of disk space. A solution may be to delete old, large files from a directory. Let's write a D program to perform this task.

How to do it…

Execute the following steps to find the largest files in a directory:

  1. Use the std.file.dirEntries function to get a listing of all files.

  2. Define the DirEntry variable as an array.

  3. Sort the array by size in descending order by using std.algorithm and a lambda function.

  4. Filter out the newer files with std.algorithm.filter.

  5. Delete the top 10 files with the std.file.remove function.

The code is as follows:

void main() {
    import std.file, std.algorithm, std.datetime, std.range;
    DirEntry[] allFiles;
    foreach(DirEntry entry; dirEntries("target_directory", SpanMode.depth))
        allFiles ~= entry;
    auto sorted = sort!((a, b) => a.size > b.size)(allFiles);
    auto filtered = filter!((a) => Clock.currTime() - a.timeLastModified >> 14.days)(sorted);
    foreach(file; filtered.take!...

Creating a network client and server

Networking is a common requirement in modern applications. Phobos offers a module, std.socket, which provides a foundation for networked applications. We'll write a client and server pair to demonstrate how to use it. The client will send lines from standard input to the server. The server will accept any number of connections, say hello to new clients, and then echo back whatever it received.

How to do it…

We'll be building two separate applications: the client and the server.

Client

Let's create a client by executing the following steps:

  1. Create a Socket object.

  2. Connect to the server.

  3. Declare a buffer to hold the received data. The buffer must be preallocated to the maximum amount of data you want to handle in a single call to receive the data. Here, we'll use a static array of length 1024; it will have plenty of room to hold our message.

  4. Receive the hello message we sent in the server.

  5. Then, send each line of the message to the server, wait for the response...

Using Base64 to create a data URI

Given a CSS file, we want to replace all instances of a particular image URL with a data URI to reduce the number of requests. Let's write a small D program to do this replacement.

How to do it…

Let's create a data URI by executing the following steps:

  1. Load the image file with std.file.read().

  2. Create the data URI with std.base64 as shown in the following code:

    pure char[] makeDataUri(string contentType, in void[] data) {
    import std.base64;
    return "data:" ~ contentType ~ ";base64," ~ Base64.encode(cast(const(ubyte[]))) data;
}

  3. Load the CSS file with std.file.readText.

  4. Use std.array.replace to replace the URL with the data URI.

  5. Save the CSS file with std.file.write.

Putting it all together in main, you will have the following code:

void main() {
    import std.file, std.array;
    auto imageData = std.file.read("image.png"); // step 1
    string dataUri = makeDataUri("image/png", imageData); 
    // step 2
    auto cssFile = std.file.readText("style.css"); ...

Generating random numbers

Random numbers are commonly necessary in computer programs. Phobos' std.random module offers a variety of random number generators and other functions related to randomization. Here, we'll create a little number guessing game with a replay function. The user guesses the generated number, and then the program tells them if they were high or low.

How to do it…

Let's generate random numbers by executing the following steps:

  1. Create a random number generator, seeding it with the replay value, if given, or unpredictableSeed for a new game.

  2. Generate a random number between 0 and 100.

  3. Ask the user for their guess. Tell them if they were low or high and let them continue trying until they get it. Save each line of user input to the replay file.

  4. When the user is done playing, let them know how many tries they took to get the correct number.

The code is as follows:

import std.random, std.conv, std.string, std.stdio;

int playRound(ref Random generator, File userInput, File saveFile...

Normalizing a string and performing Unicode comparisons

We want to make a filename or URL based on an article title. To do this, we'll have to limit the size to an appropriate number of characters, strip out improper characters, and format the string in a consistent way. We also want it to remain in the valid UTF-8 format.

How to do it…

Let's normalize a string by executing the following steps:

  1. Use std.uni.normalize to get Unicode characters into a consistent format.

  2. Use std.string.toLower to convert everything to lowercase for consistency.

  3. Use std.regex to strip out all but a small set of characters.

  4. Use std.string.squeeze to collapse consecutive whitespace.

  5. Use std.array.replace to change spaces into dashes.

  6. Use std.range.take to get the right number of characters, then convert the result back to string.

The code is as follows:

void main(){
  string title = "The D Programming Language: Easy Speed!";
  import std.uni, std.string, std.conv, std.range,std.regex;
  title = normalize(title);
  title...

Searching with regular expressions

Regular expressions are a common tool to perform advanced operations on text, including complex searches, replacements, splitting, and more. Unlike JavaScript or Perl, D does not have regular expressions built into the language, but it has all the same power—and more—as those languages through the std.regex Phobos module. To explore regular expressions in D, we'll write a small program that searches stdin for a particular regex that is given on the command line and prints out the matching lines.

How to do it…

Let's use the search operation with regular expressions by executing the following steps:

  1. Create a Regex object. If you are using string literals, D's r"" or `` syntax makes it much more readable.

  2. Loop over the matches and print them out.

Pretty simple! The code is as follows:

void main(string[] args) {
    import std.regex, std.stdio;
    auto re = regex(args[1], "g");
    foreach(line; stdin.byLine)
    if(line.match(re)) writeln(line, " was a match!"...

Writing a digest utility

Phobos provides a package called std.digest that offers checksum and message digest algorithms through a unified API. Here, we'll create a small MD5 utility that calculates and prints the resulting digest of a file.

How to do it…

Let's print an MD5 digest by executing the following steps:

  1. Create a digest object with the algorithm you need. Here, we'll use MD5 from std.digest.md.

  2. Call the start method.

  3. Use the put method, or the put function from std.range, to feed data to the digest object.

  4. Call the finish method.

  5. Convert hexadecimal data to string if you want.

The code is as follows:

void main(string[] args) {
    import std.digest.md;
    import std.stdio;
    import std.range;

    File file;
    if(args.length > 1)
        file = File(args[1], "rb");
    else
        file = stdin;
    MD5 digest;
    digest.start();
    put(digest, file.byChunk(1024));
    writeln(toHexString(digest.finish()));
}

How it works…

The std.digest package in Phobos defines modules that all...

Using the std.zlib compression

Phobos provides a wrapper for the common zlib/gzip/DEFLATE compression algorithm. This algorithm is used in the .zip files, the .png images, the HTTP protocol, the common gzip utility, and more. With std.zlib, we can both compress and decompress data easily.

How to do it…

Let's compress and decompress data by executing the following steps:

  1. Import std.zlib.

  2. Create an instance of Compress or UnCompress, depending on what direction you want to go.

  3. Call the compress or uncompress methods for each block of data, concatenating the pieces together as they are made.

  4. Call flush to get the last block of data.

The code is as follows:

void main() {
  import std.zlib, std.file;
  auto compressor = new Compress(HeaderFormat.gzip);
  void[] compressedData;
  compressedData ~= compressor.compress("Hello, ");
  compressedData ~= compressor.compress("world!");
  compressedData ~= compressor.flush();
  std.file.write("compressed.gz", compressedData);
}

Running the program will create...

Using the std.json module

JSON is a common data interchange format used on the Web. Phobos has a std.json module that can be used to read and write JSON data. The std.json module is an old module that doesn't take advantage of many of D's advanced features, making it somewhat difficult to use. While newer JSON libraries exist for D, including ones that can be used with syntax and convenience, which is extremely similar to JavaScript itself, Phobos has not yet adopted any of them. Here, we'll read a JSON string, print the current contents, add a new field, and then print out the new JSON.

How to do it…

Suppose we're consuming a web API that returns an array of person objects with a name and ID field. We get the following JSON string from the API:

[{"name":"Alice","id":1},{"name":"Bob","id":2}]

Let's execute the following steps to use the std.json module:

  1. Parse the JSON string.

  2. Loop over the array, getting objects out.

  3. Print the information we need, getting the types out of the web API's specification...

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Publication date : May 26, 2014
Length: 362 pages
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Language : English
ISBN-13 : 9781783287215
Category :
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Concepts :
Application Development

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Length: 362 pages
Edition :
Language : English
ISBN-13 : 9781783287215
Category :
Programming
Concepts :
Application Development

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Table of Contents

12 Chapters
Core Tasks Chevron down icon Chevron up icon
Core Tasks
Introduction
Installing the compiler and writing a "Hello World" program
Adding additional modules (files) to your program
Using external libraries
Building and processing arrays
Using associative arrays to translate input
Creating a user-defined vector type
Using a custom exception type
Understanding immutability
Slicing a string to get a substring
Creating a tree of classes
Phobos – The Standard Library Chevron down icon Chevron up icon
Phobos – The Standard Library
Introduction
Performing type conversions
Finding the largest files in a directory
Creating a network client and server
Using Base64 to create a data URI
Generating random numbers
Normalizing a string and performing Unicode comparisons
Searching with regular expressions
Writing a digest utility
Using the std.zlib compression
Using the std.json module
Ranges Chevron down icon Chevron up icon
Ranges
Introduction
Using ranges when implementing an algorithm
Creating an input range
Creating an output range
Creating a higher-order range
Putting a range interface on a collection
Creating an input range over a tree structure
Using runtime polymorphic (class) ranges
Storing a range as a data member
Sorting ranges efficiently
Searching ranges
Using functional tools to query data
Integration Chevron down icon Chevron up icon
Integration
Introduction
Calling the Windows API functions
Removing the Windows console
Making Linux system calls
Writing part of a C program in D
Interfacing with C++
Using structs to mimic the C++ object structure
Communicating with external processes
Communicating with a dynamic scripting language
Using Windows' COM
Resource Management Chevron down icon Chevron up icon
Resource Management
Introduction
Avoiding the garbage collector
Making a reference-counted object
Manually managing class memory
Using scope guards to manage transactions
Creating an array replacement
Managing lent resources
Creating a NotNull struct
Using unique pointers
Using RAII and handling the limitations of class destructors
Wrapped Types Chevron down icon Chevron up icon
Wrapped Types
Introduction
Creating a struct with reference semantics
Simulating inheritance with structs
Creating a ranged integer
Creating an opaque handle type
Creating a subtyped string for i18n
Forwarding methods with opDispatch
Creating a tagged dynamic type
Creating a structure with two views into the same data
Simulating multiple inheritance with mixin templates
Correctness Checking Chevron down icon Chevron up icon
Correctness Checking
Introduction
Using assertions and exceptions
Using static asserts
Using template constraints and static if
Preventing memory corruption bugs with @safe
Leveraging const-correctness
Avoiding side effects of pure functions
Verifying object invariants and pre- and post-conditions
Unit testing your code
Documenting your code with Ddoc
Writing platform-specific code (versions) and per-client configuration modules
Reflection Chevron down icon Chevron up icon
Reflection
Introduction
Getting dynamic runtime type information
Getting a list of child classes
Determining whether a module is available
Getting a list of all methods or fields in a module or an object
Inspecting function overloads
Determining names, types, and default values of function parameters
Getting components of complex types
Using user-defined attributes
Implementing a custom lint-style check for virtual functions
Extending the runtime type information
Creating a command-line function caller
Code Generation Chevron down icon Chevron up icon
Code Generation
Introduction
Creating user-defined literals
Parsing a domain-specific language
Generating data structures from text diagrams
Automating dynamic calls with multiple dispatch
Building a lookup table
Using string parameters to change functions
Wrapping instance methods
Using opDispatch to generate properties
Duck typing to a statically-defined interface
Multitasking Chevron down icon Chevron up icon
Multitasking
Introduction
Using threads
Passing messages with std.concurrency
Processing parallel data with std.parallelism
Using fibers
Creating new processes
Exploring thread-safe, single-locking singletons
Using asynchronous I/O
D for Kernel Coding Chevron down icon Chevron up icon
D for Kernel Coding
Introduction
Running D on bare metal x86 with a stripped runtime
Adding interrupt handling to the bare metal x86 code
Web and GUI Programming Chevron down icon Chevron up icon
Web and GUI Programming
Introduction
Creating a dynamic website with cgi.d
Creating a web API with web.d
Parsing and modifying an HTML page with dom.d
Accessing a SQL database
Sending an e-mail
Writing colored output to the console
Getting real-time input from the terminal
Working with image files
Creating a graphics window to show a TV static demo
Creating an OpenGL window

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Dmitry Podborits Oct 13, 2015
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This book is a collection of well-crafted "recipes", each aiming at some realistic software engineering problem, and each blending just enough pragmatism, theory and hard-won programming experience to make a novice D user (such as myself) appreciate the sheer power and elegance of this language and learn more about it.While going through the recipes comprising this cookbook (and there is a lot to go through) it was hard to avoid developing an ever-growing sense of appreciation and respect for the author Adam D. Ruppe's level of expertise, eloquence and clarity of thought.I highly recommend this book. As a software practitioner, I felt both enlightened and empowered after I read it.
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Colden Cullen Jul 11, 2014
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"The D Cookbook" by Adam Ruppe is one of the most diverse technical books I've read. It manages to range all the way from the classic "Hello, world" example, all the way up to stripping the Runtime bare and running it on an OS-less board, all the while managing to fully explain (almost) everything in a way that a beginner could understand.The book is formatted in such a way that each chapter is a group of related "recipes." Each recipe explains a concept by starting with a general summary, and a code sample, and ends it up with a *very* detailed explanation of how everything works. These descriptions also often include some very helpful tangential tips about how to be better D programmer in general, which can be very helpful. It's amazing how simply Ruppe can explain how and why you should do relatively advanced things like accessing and parsing exception-less stack traces.The only thing I don't like about the recipes is that sometimes the "How it works" section can be a bit long-winded. The descriptions can often span multiple pages, often reiterating lots of information. It isn't necessarily a bad thing, but be prepared to skim a lot of the book if you already know a fair amount about D programming.Overall, I think that "The D Cookbook" is an excellent read, and should be considered required reading for anyone serious about coding with D. It also makes a very handy reference for how to do things that you can't necessarily find on StackOverflow or Dlang.org yet.**Disclaimer**: I did receive a free copy of The D Cookbook ebook in exchange for a fair and unbiased review, and it did not alter my judgement in any way, shape, or form.
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Joe Page May 04, 2015
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The D Cookbook is great! I became very interested in DLang earlier this year, though like others, I was put off by the lack of information out there. This book definitely solved that issue. I would say this book is ideal for those who already have a moderate to excellent understanding of programming as it doesn't really get into fundamentals and depth of the language or programming(though that is not the point of the book, so it is a plus in my view), The thing I like most about this book is that it solves just about every issue you may need help with when starting a new language. With a wide range of, shall I say "recipes", this book is very effective. A developer who already knows a language, can pick this book up and develop their project by getting help from the many great recipes.
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Philippe Peter Jan 01, 2016
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Je m'initie au langage D depuis peu et il me fallait un livre de recettes, "D Cookbook" est vraiment bien et permet de migrer rapidement ses outils du C++ vers le D. Il est le compagnon indispensable de Programming in D: Tutorial and Reference de Andrei Alexandrescu.
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Stephen Aug 16, 2019
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Great examples.
Amazon Verified review Amazon

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About the author

Profile icon Adam Ruppe
Adam Ruppe
Adam D. Ruppe is a professional software developer living in Watertown, New York. He started programming PCs in high school, writing assembly language, and later C and C++, using the Digital Mars compiler to build programs based on MS DOS on a hand-me-down computer. Programming in the DOS environment with the slow computer gave him early practical experience in low-level and effi cient code—skills he carries on developing today. After finishing school, he started doing web programming—initially with PHP. While he'd make it work, he often found himself longing for the good old days. One day, he decided to check back with the vendor of his old compiler and discovered the D programming language (well before it reached 1.0!). He was enamored with it and used it to write some games, and then started writing web libraries to use it for work too, to replace PHP. He found success in this endeavor in early 2009. Combining his pioneering spirit with his blend of low-level and high-level programming experience, he was able to forge ahead with D, taking it to places many people didn't believe possible
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