5.13 Evaluation

Hoot is an ahead-of-time, whole-program compiler, but what if we want to evaluate arbitrary Scheme code at runtime? Fortunately, the (hoot eval) module provides a Scheme interpreter for this purpose!

Evaluation happens in the context of an environment. Here’s a simple example:

(use-modules (hoot eval) (hoot interaction-environment))
(eval '(let ((x 1) (y 2)) (+ x y)) (interaction-environment))

Procedure: eval exp toplevel-env ¶

Evaluate exp in the context of the environment toplevel-env.

The (hoot interaction-environment) module provides a way to capture the compile-time environment as an environment that can be used by eval.

Procedure: interaction-environment ¶

Return an evaluation environment containing all of the bindings in the current module.