By Martin Fowler
Whilst rigorously chosen and used, Domain-Specific Languages (DSLs) may perhaps simplify advanced code, advertise potent verbal exchange with consumers, enhance productiveness, and unclog improvement bottlenecks. In Domain-Specific Languages, famous software program improvement specialist Martin Fowler first offers the knowledge software program pros have to come to a decision if and while to make use of DSLs. Then, the place DSLs turn out appropriate, Fowler provides potent ideas for development them, and publications software program engineers in selecting the right ways for his or her functions.
This book’s ideas can be applied with latest object-oriented languages; the writer offers quite a few examples in Java and C#, in addition to chosen examples in Ruby. at any place attainable, chapters are geared up to be self-standing, and such a lot reference subject matters are provided in a well-recognized styles layout.
Armed with this wide-ranging ebook, builders could have the data they should make very important judgements approximately DSLs—and, the place applicable, achieve the numerous technical and enterprise advantages they provide.
The issues coated include:
• How DSLs evaluate to frameworks and libraries, and whilst these possible choices are sufficient
• utilizing parsers and parser turbines, and parsing exterior DSLs
• realizing, evaluating, and selecting DSL language constructs
• opting for even if to take advantage of code new release, and evaluating code new release strategies
• Previewing new language workbench instruments for developing DSLs
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Extra info for Domain-Specific Languages (Addison-Wesley Signature Series)
You might build several controllers and only then realize that there is a lot of common functionality. I'd then refactor the system to create separation between the model and the configuration code. This separation is the vital step. While I might have a DSL in mind while doing it, I'd be more inclined to get the separation done first, before putting the DSL on top. While I'm here, I should stress something that I wish I didn't need to. Do make sure all your DSL scripts are kept under some form of version control system.
While I don't think anyone would disagree that regular expressions are a DSL, there's plenty of cases that are open to reasonable argument. As a result I think it's worth talking about some of these cases here as they help provide a better idea of how to think about DSLs. Each style of DSL has different boundary conditions, so I'll discuss them separately. As we go through these, it's worth remembering that the distinguishing characteristics of DSLs are their language nature, domain focus, and limited expressiveness.
I use domain language to mean a domain-specific human language and reserve "DSL" for computer languages. So, what has this discussion of the boundaries of DSLs taught us? Hopefully, one thing that is clear is that there are few sharp boundaries. Reasonable people can disagree on what is a DSL. Tests like language nature and limited expressiveness are themselves very blurry, so we should expect the result to exhibit the same blur. And not everyone will use the boundary conditions that I do. In this discussion, I've excluded many things from being a DSL, but this doesn't mean that I don't consider them valuable.