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NFJS2025

Language-oriented Programming and Language Workbenches: Building Domain Languages atop Java

This session shows how to use Java as the building block for domain-specific languages. It discusses the next revolution in programming: language-oriented programming and the nascent tools that support it.

If you look at the way advanced programmers in highly dynamic languages (like Lisp, Smalltalk, Ruby, etc.) work, they tend to build domain specific languages on top of their low-level language. The language syntax itself becomes building blocks for languages that are highly specific to their problem domain. It’s not as easy to apply this technique to a static language (like Java), but it is possible. This session shows how to use Java as the building block for domain-specific languages. It discusses internal and external DSLs, with pros and cons for each. This session progresses from creating an internal DSL using Java syntactic elements as keywords through using compiler-building tools to create your own external DSL arriving ultimately at the new tools that allow you to build, edit, and deploy external DSL (language workbenches). This session covers the theory and practice of building DSL's and why this is an important step in the evolution of programming paradigm. It shows tools that are available now to build DSL's and discusses tools on the horizon that will make this much easier.

Key Session Points:

  1. Why Dynamic languages?
  2. Building domain languages
  3. Language-oriented Programming
       a. Internal DSLs
       b. External DSLs
  4. Internal DSL
       a. Characteristics
       b. Advantages
       c. Disadvantages
  5. External DSL
       a. Characteristics
       b. Advantages
       c. Disadvantages
  6.  Case Study: Building your own language
       a. Building the parser
       b. Building the lexer
       c. Abstract Syntax Trees
  7.   Parsing other languages
       a. Parsing Java
       b. Parsing HTML, JavaScript, and others
  8. Language Workbenches
       a. JetBrains MPS in Action

Neal Ford

About Neal Ford

Neal is Director, Software Architect, and Meme Wrangler at ThoughtWorks, a global IT consultancy with an exclusive focus on end-to-end software development and delivery.
Before joining ThoughtWorks, Neal was the Chief Technology Officer at The DSW Group, Ltd., a nationally recognized training and development firm. Neal has a degree in Computer Science from Georgia State University specializing in languages and compilers and a minor in mathematics specializing in statistical analysis.
He is also the designer and developer of applications, instructional materials, magazine articles, video presentations, and author of 6 books, including the most recent The Productive Programmer. His language proficiencies include Java, C#/.NET, Ruby, Groovy, functional languages, Scheme, Object Pascal, C++, and C. His primary consulting focus is the design and construction of large-scale enterprise applications. Neal has taught on-site classes nationally and internationally to all phases of the military and to many Fortune 500 companies. He is also an internationally acclaimed speaker, having spoken at over 100 developer conferences worldwide, delivering more than 600 talks. If you have an insatiable curiosity about Neal, visit his web site at http://www.nealford.com. He welcomes feedback and can be reached at nford@thoughtworks.com.

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