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Didier Verna's Scientific Blog - Nice little trick du jour - Comments Didier Verna's scientific blog: Lisp, Emacs, LaTeX and random stuff. 2024-01-31T17:45:28+00:00 Didier Verna urn:md5:a22c53786aff986a2da4c770c233a8f9 Dotclear Nice little trick du jour - Didier urn:md5:d31a72977f7853b581412cb169fdde81 2013-07-01T11:56:06+02:00 2013-07-01T10:56:06+02:00 Didier <p>Of course, you're right. This is even better!</p> Nice little trick du jour - ... urn:md5:81af989779bc26fc3c2fba300906df1f 2013-06-30T20:42:08+02:00 2013-07-01T10:54:52+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 - Eric urn:md5:1420cc73c2ac7f9b7c2535b3e64be5d7 2013-06-28T21:24:48+02:00 2013-07-01T10:54:52+02:00 Eric <p>Here it is in terms of the SERIES package: (collect (scan-file filename))</p> Nice little trick du jour - stassats urn:md5:f674a46483995964da214706361cf95a 2013-06-26T22:14:35+02:00 2013-06-27T07:54:51+02:00 stassats <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 - pdw urn:md5:5b7d7e58f9f06b1ad72bbcd8ca04d576 2013-06-26T20:55:26+02:00 2013-06-27T07:54:51+02:00 pdw <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 Beane urn:md5:7b18038f8eeb6ed3a84f65570d0fd01d 2013-06-26T18:36:26+02:00 2013-06-26T17:36:26+02:00 Zach 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 - Faré urn:md5:a5076791ac7682cc4e3bcda750574100 2013-06-26T16:45:25+02:00 2013-06-26T15:57:46+02:00 Faré <p>Or, since ASDF3, just use</p> <p>(uiop:read-file-forms filename)</p> Nice little trick du jour - Tarmil urn:md5:a72272e0b3191c867aa5938da5732331 2013-06-26T16:44:55+02:00 2013-06-26T15:57:46+02:00 Tarmil <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>