Error Question
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Brian Parker
May 4, 2023, 9:57:03 AM5/4/23
to BiwaScheme
Hello all,
I recently stumbled across BiwaScheme and I am enamoured by the whole initiative! I would love to use it at home and at work, but I keep getting an error that says found EOS in list: "(display (append lst '(3 4))\n\n\n\n\n" [] with the following basic code...
The cons seems to be working.
I very well could be doing this all wrong, please advise.
<!DOCTYPE html>
<html>
<body>
<div id="bs-console"></div>
<script src="biwascheme-0.8.0.js"></script>
<script type="text/biwascheme">
(define lst (list 1 2))
(display (append lst '(3 4))
</script>
</body>
</html>
<html>
<body>
<div id="bs-console"></div>
<script src="biwascheme-0.8.0.js"></script>
<script type="text/biwascheme">
(define lst (list 1 2))
(display (append lst '(3 4))
</script>
</body>
</html>
Yutaka Hara
May 4, 2023, 10:08:48 AM5/4/23
to biwas...@googlegroups.com
Hello all,I recently stumbled across BiwaScheme and I am enamoured by the whole initiative! I would love to use it at home and at work, but I keep getting an error that says found EOS in list: "(display (append lst '(3 4))\n\n\n\n\n" [] with the following basic code...
This error happens when a closing paren is missing. Check that all '(' has corresponding ')'.
The cons seems to be working.I very well could be doing this all wrong, please advise.<!DOCTYPE html>
<html>
<body>
<div id="bs-console"></div>
<script src="biwascheme-0.8.0.js"></script>
<script type="text/biwascheme">
(define lst (list 1 2))
(display (append lst '(3 4))
</script>
</body>
</html>
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Brian Parker
May 4, 2023, 10:13:17 AM5/4/23
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Hello Mr. Hara,
Thank you for your swift response! And how embarrassing… A missing parenthesis was the culprit!
I will continue to explore BiwaScheme and scheme in generally, hopefully becoming able to contribute to this wonderful endeavor myself some day.
Sincerely,
Brian
2023年5月4日(木) 23:08 Yutaka Hara <yutak...@gmail.com>:
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Mark Friedman
May 4, 2023, 1:10:21 PM5/4/23
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Brian,
You don't have enough closing parentheses in "(display (append lst '(3 4))".
-Mark
--
Brian Parker
May 4, 2023, 10:33:55 PM5/4/23
to biwas...@googlegroups.com
Thank you Mark! Yes, it was a silly / embarrassing mistake...
Thank you everyone for all your help.
Sincerely,
Please allow me one additional question.
I checked the List of Functions page on the homepage, but none were listed for "Port (I/O)".
Does BiwaScheme lack I/O primitives?
Does BiwaScheme lack I/O primitives?
Thank you everyone for all your help.
Sincerely,
Brian
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Yutaka Hara
May 5, 2023, 1:43:36 AM5/5/23
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2023年5月5日(金) 11:33 Brian Parker <brian3...@gmail.com>:
Thank you Mark! Yes, it was a silly / embarrassing mistake...Please allow me one additional question.I checked the List of Functions page on the homepage, but none were listed for "Port (I/O)".
Does BiwaScheme lack I/O primitives?
Oh maybe I forgot to fill that part...
Here you can find the list of implemented IO procedures.
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Brian Parker
May 5, 2023, 1:56:58 AM5/5/23
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Thank you! I will check the github page instead of the website for the latest info.
Best,
--Brian
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Brian Parker
May 5, 2023, 3:26:26 AM5/5/23
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Third and final question--I'm sorry for asking so many in probably the wrong place...
I could not spot a function to search a string. Is there such a primitive function? (E.g. substring? as in other schemes)
Thank you for all the generous support,
Brian
Brian Parker
May 5, 2023, 4:40:02 AM5/5/23
to biwas...@googlegroups.com
PS, for what its worth, I did try to write a string search function myself, but I kept getting #f for some reason I can't figure out.
(Sorry for the cryptic argument names...)
(define (string-search item source)
(rc-string-search item source 0))
(define (rc-string-search item source c)
(cond ((string<? item source) #f)
((string=?
(substring source
0
(string-length item))
item)
c)
(#t (rc-string-search
item
(substring
source 1 (string-length source))
(+ c 1)))))
(define test "This is a test.")
(display (string-search "is" test))
(newline)
(define (string-search item source)
(rc-string-search item source 0))
(define (rc-string-search item source c)
(cond ((string<? item source) #f)
((string=?
(substring source
0
(string-length item))
item)
c)
(#t (rc-string-search
item
(substring
source 1 (string-length source))
(+ c 1)))))
(define test "This is a test.")
(display (string-search "is" test))
(newline)
Sudarshan S Chawathe
May 5, 2023, 9:13:59 AM5/5/23
to biwas...@googlegroups.com
I believe there's a logic error in the rc-string-search procedure. For
example, think about what happens with
(rc-string-search "is" "is a test." 0)
Regards,
-chaw
example, think about what happens with
(rc-string-search "is" "is a test." 0)
Regards,
-chaw
Brian Parker
May 5, 2023, 10:09:57 AM5/5/23
to biwas...@googlegroups.com
Hello Chaw and friends,
Thank you for the guidance!
You were right--I had misunderstood the string<? procedure.
I have re-worked as follows, and it seems to work!
I will stay signed up to the mailing list and help answer future questions from others.
Sincerely,
--Brian
===string-search===
(define (string-search item source)
(rc-string-search item source 0))
(define (rc-string-search item source c)
(rc-string-search item source 0))
(define (rc-string-search item source c)
(cond ((< (string-length source) (string-length item)) #f)
((string=?
(substring source
0
(string-length item))
item)
c)
(#t (rc-string-search
item
(substring
source 1 (string-length source))
(+ c 1)))))
===end===
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Brian Parker
May 9, 2023, 3:16:42 AM5/9/23
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Hello friends,
I tried using a blob to create a file with output. The same code works as javascript, but I get an error "link is not defined [js-eval]" when I try to run it using the biwascheme (js-eval) process as below. Any thoughts on how to get the output of one's scheme code as a text file?
(js-eval "const blob = new Blob(['aeiou'], {type:'text/plain'});")
(js-eval "const link = document.createElement('a');")
(js-eval "link.href = URL.createObjectURL(blob);")
(js-eval "link.download = 'test.txt';")
(js-eval "link.click();")
(js-eval "const link = document.createElement('a');")
(js-eval "link.href = URL.createObjectURL(blob);")
(js-eval "link.download = 'test.txt';")
(js-eval "link.click();")
Yutaka Hara
May 10, 2023, 10:55:35 AM5/10/23
to biwas...@googlegroups.com
The code passed to js-eval cannot refer to variables defined in previous js-eval's. So this should work as you expected:
(js-eval "
const blob = new Blob(['aeiou'], {type:'text/plain'});
const blob = new Blob(['aeiou'], {type:'text/plain'});
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = 'test.txt';
link.click();
")
link.download = 'test.txt';
link.click();
")
2023年5月9日(火) 16:16 Brian Parker <brian3...@gmail.com>:
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原 悠
Yutaka HARA
Yutaka HARA
Brian Parker
May 11, 2023, 9:39:22 AM5/11/23
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Dear Mr. Hara,
That did the trick! Thank you so much for taking the time to answer again a basic question. I'm working on getting a text file in with input and another text file out with output.
Sincerely,
Brian
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