Re: [Jscheme-user] guile's quasi string approach

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You're right, i didn't look closely enough at the example.

I thought it was 
;;; output page header
(define (header title)
  #-
  <?xml version="1.0" encoding="utf-8"?>
  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

  <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
  <head>
  <title>#- title -#</title>
  </head>
  -#)
)
(header "foobar")

that is as you nested #-'s you go in and out of string/scheme mode.
But i think it would be confusing to know which level you were at.

I wouldn't add another quasi string type.  I'd make it so people could add their own # macro characters.

k
At 09:29 AM 6/23/2004 -0400, Timothy John Hickey wrote:

>On Jun 23, 2004, at 8:59 AM, Ken Anderson wrote:
>
>>http://www.unknownlamer.org/code/guile-web-manual.html
>>
>>Guile uses #- ... -# as their  quasi string approach. Interesting.
>
>But their quasi-string doesn't allow escaping into Scheme in
>the middle. It seems to be just for quoting long sections of text
>(like Pythons triple quote """.....""")
>They can get something similar to full quasi-strings though
>using string- append, or flatten-and-string-append:
>
>(flatten-and-string-append
> #- <html>
>       <head><title> -# title #- </title></head>
>       <body bgcolor="-# color #-">
>         <h1>Cool, a -# color #- page</h1>
>       </body>
>     </html> -#)
>
>which is equivalent to our approach:
>
>#{<html>
>       <head><title> #[ title ]# </title></head>
>       <body bgcolor="#[ color ]#">
>         <h1>Cool, a #[ color ]# page</h1>
>       </body>
>     </html> }#
>
>Our-variant on their approach (not escaping into Scheme)
>would be
>
>(!{}
> #-{<html>
>       <head><title>}-# title #{ </title></head>
>       <body bgcolor="}# color #{">
>         <h1>Cool, a }# color #{ page</h1>
>       </body>
>     </html> }#)
>
>This makes it a little more clear locally what is a string
>and what is Scheme and uses our built-in operator
>!{} == flatten-and-string-append
>
>
>Maybe we should add guile-style quasi-strings to JScheme.
>It would be easy and the guile approach does have a certain elegance!
>
>--Tim---