Every developer has a moment in his life where he wants to write his own programming language. In this article, I want to show you how to do this for a simple lisp compiler. Firstly, lisp is very simple for create and for understanding. S-Expression are needed for data representation and may consist of atoms numbers, symbols, boolean expressions or are the expression of the form x.
LISP - Program Structure
LISP - Program Structure - Tutorialspoint
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Introducing Flea - A tiny Lisp written in Ruby
Lisp languages have been around for years. They are all built on a simple syntax: everything is made of lists or tuples. An expression is a list, as well as instructions, definitions and even control structures. The first item in the list is usually the function or the operation that will be applied to every subsequent element in the list. That is true for mathematical operations, too.
LISP expressions are called symbolic expressions or s-expressions. The s-expressions are composed of three valid objects, atoms, lists and strings. The interpreter checks the source code in a repeated loop, which is also called the read-evaluate-print loop REPL. It reads the program code, evaluates it, and prints the values returned by the program.