Chapter 8. An Expression Language
In this chapter, we will implement a DSL for expressions, including arithmetic, boolean, and string expressions. We will do that incrementally and in a test-driven way. Since expressions are by their own nature recursive, writing a grammar for this DSL requires some additional efforts, and this allows us to discover additional features of Xtext grammars.
You will also learn how to implement a type system for a DSL to check that expressions are correct with respect to types, for example, you cannot add an integer and a boolean. We will implement the type system so that it fits the Xtext framework and integrates correctly with the corresponding IDE tooling.
Finally, we will implement an interpreter for these expressions. ...
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