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E-raamat: DSLs in Action

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  • Formaat: 376 pages
  • Ilmumisaeg: 30-Nov-2010
  • Kirjastus: Manning Publications
  • Keel: eng
  • ISBN-13: 9781638351177
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DSLs in ActionSuurem pilt
  • Formaat: 376 pages
  • Ilmumisaeg: 30-Nov-2010
  • Kirjastus: Manning Publications
  • Keel: eng
  • ISBN-13: 9781638351177
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DSLs in Action introduces the concepts and definitions a developer needs to build high-quality domain specific languages. It provides a solid foundation to the usage as well as implementation aspects of a DSL, focusing on the necessity of applications speaking the language of the domain. After reading this book, a programmer will be able to design APIs that make better domain models. For experienced developers, the book addresses the intricacies of domain language design without the pain of writing parsers by hand.

The gap in understanding between the development team and the business domain specialists can lead to errors during user acceptance tests. This book teaches developers to build DSLs that bridge this gap by offering API development techniques that closely model the domain vocabulary. Even non-programmer domain experts can benefit from this book by learning how DSLs can make them a more integral part of the team during the program development phase.

The book discusses DSL usage and implementations in the real world based on a suite of JVM languages like Java, Ruby, Scala, and Groovy. It contains code snippets that implement real world DSL designs and discusses the pros and cons of each implementation.

Foreword xiii
Preface xv
Acknowledgments xvii
About the book xix
PART I INTRODUCING DOMAIN-SPECIFIC LANGUAGES
1(84)
1 Learning to speak the language of the domain
3(22)
1.1 The problem domain and the solution domain
4(2)
The problem domain
4(1)
The solution domain
4(2)
1.2 Domain modeling: establishing a common vocabulary
6(2)
Benefits of a common vocabulary
7(1)
1.3 Introducing DSLs
8(7)
What's a DSL?
10(2)
Popular DSLs in use
12(2)
Structure of a DSL
14(1)
1.4 Execution model of a DSL
15(2)
1.5 Classifying DSLs
17(3)
Internal DSLs
18(1)
External DSLs
18(1)
Nontextual DSLs
19(1)
1.6 When do you need a DSL?
20(2)
The advantages
20(1)
The disadvantages
21(1)
1.7 DSLs and abstraction design
22(1)
1.8 Summary
23(1)
1.9 References
24(1)
2 The DSL in the wild
25(29)
2.1 Building your first Java DSL
26(6)
Selling up the common vocabulary
27(1)
Your first Java implementation
28(4)
2.2 Making friendlier DSLs
32(4)
Externalizing the domain wilh XML
32(1)
Groovy: a more expressive implementation language
33(2)
Executing the Groovy DSL
35(1)
2.3 DSL implementation patterns
36(14)
Internal DSL patterns: commonality and variability
37(8)
External DSL patterns: commonality and variability
45(5)
2.4 Choosing DSL implementations
50(2)
2.5 Summary
52(1)
2.6 References
53(1)
3 DSL-driven application development
54(31)
3.1 Exploring DSL integration
55(3)
Why you should rare about DSL integration
56(2)
3.2 Internal DSL integration patterns
58(18)
Using the Java 6 scripting engine
60(4)
Using a DSL wrapper
64(9)
Language-specific integration features
73(2)
Spring-based integration
75(1)
3.3 External DSL integradon patterns
76(2)
3.4 Handling errors and exceptions
78(4)
Naming an exception
79(1)
Handling incorrect typing errors
80(1)
Handling exceptional business conditions
81(1)
3.5 Managing performance
82(1)
3.6 Summary
83(1)
3.7 References
84(1)
PART II IMPLEMENTING DSLS
85(190)
4 Internal DSL implementation patterns
87(41)
4.1 Filling your DSL toolbox
88(2)
4.2 Embedded DSLs: patterns in metaprogramming
90(16)
Implicit context and Smart APIs
91(5)
Reflective metaprogramming with dynamic decorators
96(6)
Reflective metaprogramming with builders
102(3)
Lessons learned: metaprogramming patterns
105(1)
4.3 Embedded DSLs: patterns with typed abstractions
106(12)
Higher-order functions as generic abstractions
106(7)
Using explicit type constraints to model domain logic
113(4)
Lessons learned: thinking in types
117(1)
4.4 Generative DSLs: boilerplates for runtime generation
118(4)
How generative DSLs work
118(1)
Ruby metaprogramming for concise DSL design
119(3)
4.5 Generative DSLs: macros for compile-time code generation
122(4)
Metaprogramming with Clojure
122(1)
Implementing the domain model
123(2)
The beauty of Clojure macros
125(1)
4.6 Summary
126(1)
4.7 References
127(1)
5 Internal DSL design in Ruby, Groovy, and Clojure
128(38)
5.1 Making DSLs concise with dynamic typing
129(6)
Readability
130(1)
Duck typing
131(2)
Metaprogramming---again!
133(1)
Why Ruby, Groovy, and Clojure?
134(1)
5.2 A trade-processing DSL in Ruby
135(13)
Getting started with an API
136(3)
A little bit of monkey-patching
139(1)
Rolling out a DSL interpreter
140(3)
Adding domain rules as decorators
143(5)
5.3 The order-processing DSL: the final frontier in Groovy
148(5)
The order-processing DSL so far
148(1)
Controlling the scope of metaprogramming
149(3)
Rounding it off
152(1)
5.4 Thinking differently in Clojure
153(9)
Building a domain object
154(1)
Enriching domain objects using decroators
155(6)
A DSL session at the REPL
161(1)
5.5 Recommendations to follow
162(2)
Honor the principle of least complexity
162(1)
Strive for optimal expressivity
162(1)
Avoid diluting the principles of well-designed abstractions
163(1)
Avoid language cacophony
163(1)
5.6 Summary
164(1)
5.7 References
165(1)
6 Internal DSL design in Scala
166(45)
6.1 Why Scala?
167(2)
6.2 Your first step toward a Scala DSL
169(1)
Testing Java objects with a Scala DSL
169(1)
Scala DSL as a wrapper for Java objects
170(1)
Modeling noncritical Juncitonality as a Scala DSL
170(1)
6.3 Let's DSL in Scala!
170(5)
Expressive syntax on the surface
171(1)
Creating domain abstractions
172(3)
6.4 Building a DSL that creates trades
175(7)
Implementation details
177(4)
Variations in DSL implmentation patterns
181(1)
6.5 Modeling business rules with a DSL
182(8)
Pattern matching as an extensible Visitor
183(1)
Enriching the domain model
184(3)
Calculating tax and fee business rules in a DSL
187(3)
6.6 Stitching 'em all together
190(3)
More abstraction with traits and types
190(2)
Making domain components concrete
192(1)
6.7 Composing DSLs
193(10)
Composing using extensions
194(5)
Composing different DSLs using hierarchical composition
199(4)
6.8 Monadic structures in DSL
203(5)
6.9 Summary
208(1)
6.10 References
209(2)
7 External DSL implementation artifacts
211(64)
7.1 Anatomy of an external DSL
212(5)
The simplest option first
212(1)
Abst racting the domain model
213(4)
7.2 The role of a parser in designing an external DSL
217(8)
Parsers and parser generators
217(2)
Syntax-directed translation
219(6)
7.3 Classifying parsers
225(6)
Simple top-down parsers
226(2)
Advanced top-down parsers
228(1)
Bottom-up parsers
229(2)
7.4 Tool-based DSL development with Xtext
231(7)
Grammar rules and the outline view
232(1)
The melamodel for your grammar
233(3)
Generating code for the semantic model
236(2)
7.5 Summary
238(1)
7.6 References
239(3)
Designing external DSLs using Scala parser combinators
241(1)
8.1 Parser combinators
242(4)
What are parser combinators?
243(1)
Designing DSLs the parser combinator way
244(2)
8.2 The Scala parser combinator library
246(11)
The base abstractions in the parser combinator library
247(1)
The combinators that glue parsers together
248(4)
Monads for DSL parser composition
252(2)
Packrat parsing for left recursive DSL syntax
254(3)
8.3 DSL design with parser combinators: step-by-step
257(7)
Step 1 Executing the grammar
258(1)
Step 2 Building the semantic model for the DSL
259(1)
Step 3 Designing the Order abstraction
260(1)
Step 4 Generating the AST using function application combinators
261(3)
8.4 A DSL that needs a packrat parser
264(8)
Introducing the domain problem
264(2)
Building the grammar
266(2)
Designing the semantic model
268(2)
Parser composition for extending DSL semantics
270(2)
8.5 Summary
272(1)
8.6 References
273(2)
PART III FUTURE TRENDS IN DSL DEVELOPOMENT
275(16)
9 DSL design: looking forward
277(14)
9.1 Growing language support for DSL design
278(4)
Striving to be expressive
279(2)
More power with metapgrogramming
281(1)
s-expressions instead of XML as the carrier
281(1)
Parser combinators becoming more popular
282(1)
9.2 DSL workbenches
282(3)
What's in a DSL workbench?
283(1)
The advantages of using a DSL workbench
284(1)
9.3 More tool support
285(1)
9.4 The mature evolution of a DSL
286(3)
Versioning your DSL
286(1)
Best practices for a smoother evolution of DSL
287(2)
9.5 Summary
289(1)
9.6 References
290(1)
appendix A Role abstractions in domain modeling 291(20)
appendix B Metaprogramming and DSL design 311(10)
appendix C A cheat sheet for Ruby's DSL-friendly features 321(4)
appendix D A cheat sheet for Scala's DSL-friendly features 325(5)
appendix E A cheat sheet for Groovy's DSL-friendly features 330(3)
appendix F A cheat sheet for Clojure's DSL-friendly features 333(4)
appendix G Polyglot development 337(4)
Index 341
Debasish Ghosh

, Chief Technology Evangelist at Anshinsoft, is passionate

about programming languages and cooperative polyglotism. He has

developed systems using multiple JVM languages and has designed DSLs

using Java, Ruby, and Scala. Debasish is a senior member of the ACM and

an active blogger on programming techniques and languages.
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