I understand that ::foo is a keyword bound into the local namespace. I also understand (according to the docs) that
:my.namespace/foo is the keyword foo in the namespace my.namespace. ::nsalias/foo is the keyword foo in the namespace my.namespace if I've aliased my.namespace to nsalias. But also: ::my.namespace/foo is equivalent to :my.namespace/foo (as a convenience, I guess). :nsalias/foo is not the same as ::nsalias/foo - in fact, I'm not sure what :nsalias/foo is - a call on str yields ":nsalias/foo". This last point is the one that's confusing me. On Saturday, March 9, 2013 8:36:30 AM UTC, Gary Verhaegen wrote: > > The reader basically transforms :: into :namespace/, which means that > the remaining part must be an unqualified symbol (i.e. no / in it). > The character / is not allowed in unqualified symbols. As the > documentation [1] says : "'/' has special meaning, it can be used once > in the middle of a symbol to separate the namespace from the name, > e.g. my-namespace/foo. '/' by itself names the division function." > > Your notation ::junk/junk, assuming your type in namespace > my.namespace.junk, would result in the keyword > :my.namespace.junk/junk/junk, which is invalid (two /'s). Hence the > implied restriction that ::symbol cannot contain a / character. > > I'm not really sure what you mean about aliases. Keywords stand by > themselves (they are literals that evaluate to themselves), they are > not aliases for something else. > > [1] http://clojure.org/reader > > On 8 March 2013 16:56, nick rothwell <ni...@cassiel.com <javascript:>> > wrote: > > Typing the following at a REPL: > > > > (str ::junk/junk) > > > > (where there's no alias for junk) gives me: > > > > RuntimeException Invalid token: ::junk/junk > > clojure.lang.Util.runtimeException (Util.java:219) > > RuntimeException Unmatched delimiter: ) > clojure.lang.Util.runtimeException > > (Util.java:219) > > > > A couple of things: > > > > (i) Invalid token seems a bit curt: doesn't it mean something like "no > such > > namespace alias"? > > (ii) A complete aside, but: the interactive REPL obviously isn't > > disregarding the rest of the line when it gets a token error. > > > > Another aside: why does Clojure require "::" for aliases but only ":" > for > > namespace-qualified keywords? Under what circumstance would I use > :junk/junk > > in any way other than to mean ::junk/junk (or :my.namespace.junk/junk, > given > > the appropriate alias)? > > > > -- > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clo...@googlegroups.com<javascript:> > > Note that posts from new members are moderated - please be patient with > your > > first post. > > To unsubscribe from this group, send email to > > clojure+u...@googlegroups.com <javascript:> > > For more options, visit this group at > > http://groups.google.com/group/clojure?hl=en > > --- > > You received this message because you are subscribed to the Google > Groups > > "Clojure" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to clojure+u...@googlegroups.com <javascript:>. > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
