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Warning: Cannot modify header information - headers already sent by (output started at /home/didierve/didierverna.net/blog/inc/libs/clearbricks/common/lib.json.php:309) in /home/didierve/didierverna.net/blog/inc/libs/clearbricks/common/lib.http.php on line 295 Didier Verna's Scientific Blog - Nice little trick du jour - CommentsDidier Verna's scientific blog: Lisp, Emacs, LaTeX and random stuff.2024-01-31T17:45:28+00:00Didier Vernaurn:md5:a22c53786aff986a2da4c770c233a8f9DotclearNice little trick du jour - Didierurn:md5:d31a72977f7853b581412cb169fdde812013-07-01T11:56:06+02:002013-07-01T10:56:06+02:00Didier<p>Of course, you're right. This is even better!</p>Nice little trick du jour - ...urn:md5:81af989779bc26fc3c2fba300906df1f2013-06-30T20:42:08+02:002013-07-01T10:54:52+02:00...<p>Here's a way that avoids problems with reading atoms or dotted lists and just looks more sensible:</p>
<p>(defun list-stream (stream)<br />
(make-concatenated-stream<br />
(make-string-input-stream "(")<br />
stream<br />
(make-string-input-stream ")")))</p>
<p>(defun read-forms (filename)<br />
(with-open-file (stream filename)<br />
(read (list-stream stream))))</p>Nice little trick du jour - Ericurn:md5:1420cc73c2ac7f9b7c2535b3e64be5d72013-06-28T21:24:48+02:002013-07-01T10:54:52+02:00Eric<p>Here it is in terms of the SERIES package: (collect (scan-file filename))</p>Nice little trick du jour - stassatsurn:md5:f674a46483995964da214706361cf95a2013-06-26T22:14:35+02:002013-06-27T07:54:51+02:00stassats<p>That loop is a bit strange, it'd be less clunky with<br />
(loop ... until (eq expr eof-marker) collect expr)</p>Nice little trick du jour - pdwurn:md5:5b7d7e58f9f06b1ad72bbcd8ca04d5762013-06-26T20:55:26+02:002013-06-27T07:54:51+02:00pdw<p>The loop version can be made a bit nicer:</p>
<p>(loop<br />
:for expr = (read stream nil stream)<br />
:until (eq expr stream)<br />
:collect expr)</p>Nice little trick du jour - Zach Beaneurn:md5:7b18038f8eeb6ed3a84f65570d0fd01d2013-06-26T18:36:26+02:002013-06-26T17:36:26+02:00Zach Beane<p>This will work ok as long as :eof is not likely to be a form in the file. The usual trick for avoiding it is to use the stream object as the eof marker, e.g. (read stream nil stream) and (eq expr stream).</p>Nice little trick du jour - Faréurn:md5:a5076791ac7682cc4e3bcda7505741002013-06-26T16:45:25+02:002013-06-26T15:57:46+02:00Faré<p>Or, since ASDF3, just use</p>
<p>(uiop:read-file-forms filename)</p>Nice little trick du jour - Tarmilurn:md5:a72272e0b3191c867aa5938da57323312013-06-26T16:44:55+02:002013-06-26T15:57:46+02:00Tarmil<p>One possible inconvenient is that an erroneous file with an extra ")" somewhere in the middle isn't detected as erroneous; you just stop reading at that point instead. For example, a file containing:</p>
<p>(foo bar) ) (baz)</p>
<p>is read as if it was just:</p>
<p>(foo bar)</p>
<p>Maybe using some obscure control character rather than #\) as the delimiter would mitigate the problem? Feels a bit hacky though.</p>