Introduction
The Interpreter pattern is a behavioral pattern from the Gang of Four (GoF) design patterns that provides a way to evaluate and interpret a language grammar or expression. The pattern defines a language and its grammar, and then provides an interpreter that can interpret the language and execute the grammar. The Interpreter pattern is useful for implementing domain-specific languages and for parsing and interpreting user input.
Example
In Golang, the interpreter pattern can be implemented easily using the combination of interfaces, structs, and functions. Here is a more practical example of how to implement the Interpreter pattern in Golang.
Suppose we have an e-commerce website and we want to provide users with a way to filter products based on certain criteria such as price range, brand, color, etc. We can define a domain-specific language (DSL) to represent these filters and use the Interpreter pattern to parse and execute the DSL.
Let’s define our DSL:
price
represents the price filterbrand
represents the brand filtercolor
represents the color filter
Each filter has a specific syntax:
price:range(min,max)
wheremin
andmax
are integers…