-
-
Save dannypsnl/3ae083d3d59e23280bd41a47fbd7e0f4 to your computer and use it in GitHub Desktop.
Compilation-time Environment
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #lang racket/base | |
| (require (for-syntax racket/base | |
| "env.rkt")) | |
| (provide my-fun | |
| your-fun) | |
| (define (my-fun a b) | |
| (+ a b)) | |
| (define (your-fun c) | |
| (- c)) | |
| ;; https://docs.racket-lang.org/syntax/syntax-helpers.html#%28part._.Dictionaries_for_free-identifier~3d_%29 | |
| ;; Must be placed after the definition of my-fun | |
| (begin-for-syntax | |
| (env-add! #'my-fun "my-fun from add.rkt") | |
| (env-add! #'your-fun "your-fun from add.rkt")) |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| ;; Exporting free identifier table operations that close over a global map | |
| #lang racket/base | |
| (require syntax/id-table) | |
| (provide env-ref env-has-id? env-add!) | |
| (define id-table (make-free-id-table)) | |
| (define (env-ref id) | |
| (free-id-table-ref id-table id)) | |
| (define (env-has-id? id) | |
| (with-handlers ([exn:fail? (λ (e) #f)]) | |
| (free-id-table-ref id-table id) | |
| #t)) | |
| (define (env-add! id value) | |
| (free-id-table-set! id-table id value)) |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #lang racket/base | |
| (require (for-syntax racket/base | |
| "env.rkt") | |
| "add.rkt") | |
| (provide my-fun) | |
| (begin-for-syntax | |
| (printf "mul.rkt: your-fun is: ~s\n" (env-ref #'your-fun))) | |
| (define (my-fun a b) | |
| (* a (your-fun b))) | |
| ;; https://docs.racket-lang.org/syntax/syntax-helpers.html#%28part._.Dictionaries_for_free-identifier~3d_%29 | |
| ;; Must be placed after the definition of my-fun | |
| (begin-for-syntax | |
| (env-add! #'my-fun "my-fun from mul.rkt")) |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| ;; Dependency: | |
| ;; add depends on {env} | |
| ;; mul depends on {add,env} | |
| ;; use depends on {mul,add,env} | |
| #lang racket/base | |
| (require (for-syntax racket/base | |
| "env.rkt") | |
| (only-in "add.rkt" my-fun) | |
| (rename-in "mul.rkt" [my-fun mul:my-fun])) | |
| (begin-for-syntax | |
| (printf "use.rkt: my-fun = ~s\n" (env-ref #'my-fun)) | |
| (printf "use.rkt: has-key?(your-fun) = ~s\n" (env-has-id? #'your-fun)) ;; => #f | |
| (printf "use.rkt: mul:my-fun = ~s\n" (env-ref #'mul:my-fun)) | |
| ) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment