(Disclaimer: I post this aware that read-string is considered dangerous for
untrusted code and having starred tools.reader)
I was writing some code using read-string and encountered the following
(somewhat odd?) behavior:
Clojure 1.5.1
user=> (read-string "1000N(")
1000N
user=> (read-string "1000N)")
1000N
user=> (read-string "(1000N")
RuntimeException EOF while reading clojure.lang.Util.runtimeException
(Util.java:219)
user=> (read-string ")1000N")
RuntimeException Unmatched delimiter: ) clojure.lang.Util.runtimeException
(Util.java:219)
So if the string ends with an unmatched ) or (, the preceding value gets
returned and the unmatched character discarded. But if the string starts
with an unmatched parens - EOF (as expected). I was a little surprised as I
expected the first to cases to throw some kind of RuntimeException.
What is the explanation for this behavior if any, and where can I go / read
more about the underlying theory of "correctly" handling this case? I'm
aware that lexical parsing is a big topic - just wondering what the ruling
was here (if any) and looking for a jumping off point into further
readings. Also if this was discussed elsewhere (searching "read-string
unmatched paren" yielded nothing).
Thanks!
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