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Re: [Chicken-users] Store data as text in scm files

From: Ivan Shmakov
Subject: Re: [Chicken-users] Store data as text in scm files
Date: Fri, 27 Dec 2013 14:08:11 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

>>>>> mfv  <address@hidden> writes:


 > ;; 2) store as evaluated code/data ("Joe Jackson" ("person" "X" "Y")
 > (1 728 2812) ("address@hidden") ("S street" "T Town" "C Country"))

 > Again, I am not sure how the actual implentation of writing data
 > would be.

        It could be as simple as calling (write DATA).  Consider, e. g.:

- (define a '(jrh 42 (13 . 37)))
; no values returned
- (begin (write a) (newline))
(jrh 42 (13 . 37))

 > As for reading, I would read the parse the text file (e. g. by
 > reading \n separated string entries) and assign the text directly to
 > a code structure.

        It’s possible to simply (set! *database* (read)), provided that
        *database* was written with (write *database*).

 > This would happen a la (define somedata (<read-in-data>)) – or make
 > hash-tables out of them, etc.

 > ;; 3) store as text to be parsed by a parser "Joe Jackson" "person"
 > "X" "Y" 1 728 2812 "address@hidden" "S street" "T Town" "C Country"

 > The least practical solution, as it requires to write a parser.

        To note is that there’re existent parsers for a number of
        text-based data formats, such as XML, JSON, YAML, etc.

  - 42
  - { car: 13; cdr: 37; }


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