Account Options

  1. Sign in
The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Google Groups Home
« Groups Home
comp.lang.lisp
+ new post
About this group
Subscribe to this group
This is a Usenet group - learn more
Message from discussion lisp tree to clim tree
The group you are posting to is a Usenet group. Messages posted to this group will make your email address visible to anyone on the Internet.
Your reply message has not been sent.
Your post was successful
 
From:
To:
Cc:
Followup To:
Add Cc | Add Followup-to | Edit Subject
Subject:
Validation:
For verification purposes please type the characters you see in the picture below or the numbers you hear by clicking the accessibility icon. Listen and type the numbers you hear
 
WJ  
View profile  
 More options Nov 10 2012, 10:06 am
Newsgroups: comp.lang.lisp
From: "WJ" <w_a_x_...@yahoo.com>
Date: 10 Nov 2012 15:06:11 GMT
Local: Sat, Nov 10 2012 10:06 am
Subject: Re: lisp tree to clim tree
Print | View thread | Show original | Report this message | Find messages by this author

hans wrote:
> How can I transform a "lisp tree" like

> (("Class: Osteichthyes")
>  ("Class: Chondrichthyes"
>   (("Order: Squaliformes")
>    ("Order: Rajiformes")))
>  ("Class: Mammalia"
>   (("Order: Rodentia"
>     (("Family: Sciuridae")
>      ("Family: Muridae")
>      ("Family: Cricetidae")))
>    ("Order: Carnivora"
>     (("Family: Felidae")
>      ("Family: Canidae")
>      ("Family: Ursidae"))))))

> into a "clim (or mcclim) tree" like

> (("Class: Osteichthyes")
>  ("Class: Chondrichthyes"
>   :items (("Order: Squaliformes")
>           ("Order: Rajiformes")))
>  ("Class: Mammalia"
>   :items (("Order: Rodentia"
>            :items (("Family: Sciuridae")
>                    ("Family: Muridae")
>                    ("Family: Cricetidae")))
>           ("Order: Carnivora"
>            :items (("Family: Felidae")
>                    ("Family: Canidae")
>                    ("Family: Ursidae"))))))

> thank you

Using pattern-matching in Racket:

(define tree
  '(("Class: Osteichthyes")
    ("Class: Chondrichthyes"
      (("Order: Squaliformes")
       ("Order: Rajiformes")))
     ("Class: Mammalia"
      (("Order: Rodentia"
        (("Family: Sciuridae")
         ("Family: Muridae")
         ("Family: Cricetidae")))
       ("Order: Carnivora"
        (("Family: Felidae")
         ("Family: Canidae")
         ("Family: Ursidae")))))))

(define (climate tree)
  (map (match-lambda
         [(list (? string? x)) (list x)]
         [(list (? string? x) more ...)
          (list* x ':items (climate more))]
         [x (climate x)])
       tree))

(climate tree)
'(("Class: Osteichthyes")
  ("Class: Chondrichthyes"
   :items
   (("Order: Squaliformes") ("Order: Rajiformes")))
  ("Class: Mammalia"
   :items
   (("Order: Rodentia"
     :items
     (("Family: Sciuridae") ("Family: Muridae") ("Family: Cricetidae")))
    ("Order: Carnivora"
     :items
     (("Family: Felidae") ("Family: Canidae") ("Family: Ursidae"))))))


 
You must Sign in before you can post messages.
To post a message you must first join this group.
Please update your nickname on the subscription settings page before posting.
You do not have the permission required to post.
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
©2013 Google