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Re: load in environment
From: |
Marco Maggi |
Subject: |
Re: load in environment |
Date: |
Sat, 7 Jul 2007 10:52:53 +0200 |
"Jon Wilson" wrote:
>I'm writing a function to load up some data from a file and
>stick it in a hash table.
Lemmesee if I get it:
1. data representation is stored in a file;
2. the representation format is an Application Specific
Language (ASL), so the file is really a script in ASL;
3. ASL happens to be Scheme-like;
4. to convert the file representation in a process's
internal representation the script must be evaluatd in an
ASL interpreter;
5. nobody wants the ASL script to mess with the process'
state or, worst, mess with the file system, etc;
this can be done using pure modules.
(use-modules (ice-9 rdelim))
(define (make-asl-interp funcs)
(let ((asl-interp (make-module)))
(purify-module! asl-interp)
(for-each (lambda (p)
(module-define! asl-interp (car p) (cdr p)))
funcs)
asl-interp))
(define (asl-eval file-name)
(let* ((data-table (make-hash-table))
(item (lambda (name text number)
(hash-set! data-table name
(make-item text number))))
(asl-interp (make-asl-interp (list
(cons 'item item)))))
(with-input-from-file file-name
(lambda ()
(eval-string (read-delimited "") asl-interp)))
data-table))
;; ------------------------------------------------------------
(define make-item list)
(define table (asl-eval "data.asl"))
(format #t "dumping table:~%")
(hash-for-each (lambda (key val)
(format #t "~/key ~S, val ~S~%" key val))
table)
--
Marco Maggi
"They say jump!, you say how high?"
Rage Against the Machine - "Bullet in the Head"
- Re: load in environment,
Marco Maggi <=