This is a simple scheme interpreter for you to learn SICP, you can clone it from my GitHub and open in your browser.

What is a language interpreter?

A language interpreter has two parts:

• 1 Parsing: The parsing component transform an input program from a sequence of character to an internal representation by some syntactic rules.
• 2 Execution: The execution component will processing the internal representation to the real output by the semantic rules.

Here’s the working progress of a interpreter:

program(string of file) -> parse -> AST(abstract syntax tree) -> eval -> output