Visit us on the Web: presinescinmett.ga Library of Congress Cataloging-in- Publication Data: Fowler, Martin, Domain-specific languages / Martin Fowler. Domain Specific Languages (DSLs) have been around since I've been in computing, but it's hard to An external DSL is a language that's parsed independently of the host general purpose language: InformIT has epub and pdf versions. Bookreview JFP: Domain-Specific Languages by Martin Fowler The Addison Wesley Signature Series. Article (PDF Available) in Journal of.
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It involves Domain Specific Languages (DSLs) and automatic code .. Martin. Fowler and Eric Evans refer to internal DSL as a fluent. interface. Domain-Specific. Languages. Martin Fowler. With Rebecca Parsons. AAddison- Wesley. Upper Saddle River, NJ • Boston • Indianapolis • San Francisco. Domain Specific Languages Fowler Pdf Download by Wileapili, released 16 . presinescinmett.ga
This scripting language is used to weave together languages and services such as Java,. The language is now officially open source and can be downloaded from their website.
FilterMeister[ edit ] FilterMeister is a programming environment, with a programming language that is based on C, for the specific purpose of creating Photoshop -compatible image processing filter plug-ins; FilterMeister runs as a Photoshop plug-in itself and it can load and execute scripts or compile and export them as independent plug-ins.
Although the FilterMeister language reproduces a significant portion of the C language and function library, it contains only those features which can be used within the context of Photoshop plug-ins and adds a number of specific features only useful in this specific domain. MediaWiki templates[ edit ] The Template feature of MediaWiki is an embedded domain-specific language whose fundamental purpose is to support the creation of page templates and the transclusion inclusion by reference of MediaWiki pages into other MediaWiki pages.
Software engineering uses[ edit ] There has been much interest in domain-specific languages to improve the productivity and quality of software engineering.
Domain-specific language could possibly provide a robust set of tools for efficient software engineering. Such tools are beginning to make their way into the development of critical software systems. The Software Cost Reduction Toolkit  is an example of this.
Domain Specific Languages
The toolkit is a suite of utilities including a specification editor to create a requirements specification , a dependency graph browser to display variable dependencies, a consistency checker to catch missing cases in well-formed formulas in the specification, a model checker and a theorem prover to check program properties against the specification, and an invariant generator that automatically constructs invariants based on the requirements.
A newer development is language-oriented programming , an integrated software engineering methodology based mainly on creating, optimizing, and using domain-specific languages.
Further information: Metacompiler Complementing language-oriented programming , as well as all other forms of domain-specific languages, are the class of compiler writing tools called metacompilers. A metacompiler is not only useful for generating parsers and code generators for domain-specific languages, but a metacompiler itself compiles a domain-specific metalanguage specifically designed for the domain of metaprogramming.
External DSLs have a strong tradition in the Unix community. Internal DSLs are a particular form of API in a host general purpose language, often referred to as a fluent interface.
The way mocking libraries, such as JMock, define expectations for tests are good examples of this, as are many of the mechanisms used by Ruby on Rails. Internal DSLs also have a long tradition of usage, particularly in the Lisp community. This improves programmer productivity, which is always valuable.
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In particular it may also improve communication with domain experts, which is an important tool for tackling one of the hardest problems in software development. CSS is an excellent example of this, most people who program CSS don't consider themselves to be programming. Despite this, however, I don't generally think that end-users will usually write in DSLs directly - it's the communication enhancement that's important. Although DSLs have been around for a long time, the lack of knowledge of how to program with them is a significant barrier - which is exactly why I've worked on this book.
The books provides techniques to develop both internal and external DSLs, giving you both the information to choose between them and a good package of information to begin your work.
For this group, there's a good synergy with DSLs because DSLs are a good way of expressing models that describe alternative computational models which I refer to as Adaptive Models in the book. But there's the other strain of MDSD, those who think diagrams should be worth a thousand lines of code. Their embrace of DSLs seems to be a dying movement grasping at straws to retain some fragments of respectability.
The decision about whether to build a DSL is about whether the advantages of expressing the behavior in a DSL rather than the usual command-query API make it worthwhile. RJP: Using a language supporting the proper abstractions for the problem at hand is crucial to effective software development.
DSLs provide the option to tailor the language itself to the problem at hand, facilitating communication between the business and the development team. As for the internal versus external language decision, each has its advantages.
From the language design perspective, an external DSL provides the greatest flexibility, since internal DSLs must respect the parsing and language semantics of the host language.
MF: This flexibility can be particularly useful when working with non-programmers. RJP: But this design flexibility comes at the cost of additional build and development complexity.
External DSLs require the addition of tools to the development environment. Additionally, processing a DSL requires additional steps in the build to build the parser. MF: Many developers aren't very familiar with the parsing techniques you need for external DSLs, or they were exposed to them in college in the context of general-purpose languages, which are much more complicated to work with.
Since DSL scripts are frequently short, this is less of an issue. However, certain applications, such as pension rules, are actually quite lengthy.
InfoQ: What should a programming language provide in terms of features and properties to allow easy integration of internal DSLs? RJP: Clearly there has to be some way to augment the syntax of the language with some form of new semantics. This feature can take many forms.
Lisp languages have a very flexible syntax and also utilize macro-processing facilities. Ruby has a missing method handler.
MF: Closures aka anonymous functions or lambdas strike me as particularly important since they allow you to control the evaluation order of nested expressions, as well as naturally express a hierarchic structure.
Are they also appropriate for dealing with crosscutting concerns?A metacompiler is not only useful for generating parsers and code generators for domain-specific languages, but a metacompiler itself compiles a domain-specific metalanguage specifically designed for the domain of metaprogramming. Such tools are beginning to make their way into the development of critical software systems.
The Id Tech engine used standard C code meaning C had to be learned and properly applied, while UnrealScript was optimized for ease of use and efficiency.
In particular it may also improve communication with domain experts, which is an important tool for tackling one of the hardest problems in software development. The books provides techniques to develop both internal and external DSLs, giving you both the information to choose between them and a good package of information to begin your work.