Interpreter design pattern

Now we are going to dig into a quite complex pattern. The Interpreter pattern is, in fact, widely used to solve business cases where it's useful to have a language to perform common operations. Let's see what we mean by language.

Description

The most famous interpreter we can talk about is probably SQL. It's defined as a special-purpose programming language for managing data held in relational databases. SQL is quite complex and big but, all in all, is a set of words and operators that allow us to perform operations such as insert, select, or delete.

Another typical example is musical notation. It's a language itself and the interpreter is the musician who knows the connection between a note and its representation on the instrument they are playing.

In computer science, it can be useful to design a small language for a variety of reasons: repetitive tasks, higher-level languages for non-developers, or Interface Definition Languages (IDL) such as Protocol buffers or...