date:20120324

Re: Alternate set literal syntax?

2012-03-24 Thread Cedric Greevey

On Sat, Mar 24, 2012 at 1:28 AM, Sean Corfield  wrote:
> On Fri, Mar 23, 2012 at 8:44 PM, Cedric Greevey  wrote:
>> #{foo bar baz} is somewhat ugly. It occurs to me that one could modify
>> the reader to additionally accept
>>
>> {{foo bar baz}}
>
> My concern is that {{1 2 3 4}5} is currently legal - a map with a map
> as a key and 5 as the value. That means that the reader couldn't tell
> if {{ introduced your set notation or the start of a nested map
> without looking arbitrarily far ahead. And that problem gets worse if
> you encounter {{{ or  or... {{{ could introduce a nested map, a
> map of your sets or one of your sets containing a map...

The other objections are fair enough -- matters of taste. But the
above is a technical problem with a simple fix: make one pass over the
source, converting it into a rudimentary AST whose nodes just look
like (thing thing thing), #(thing thing thing), [thing thing thing],
{thing thing thing}, and #{thing thing thing} (the file as a whole can
be regarded as implicitly wrapped in (do ... )); then (assuming no
unbalanced delimiters) make a second pass doing the rest of the
reader's job. The second pass will see a {...} node with one direct
child that is also a {...} node in, and only in, the case of the
proposed set syntax. (It will also allow { {foo bar baz}} and
similarly as sets.)

As for the aesthetics, what I like about {{...}} is that the
delimiters are symmetrical, unlike #{...}, and it would allow one to
reserve use of the # mark to, mostly, closures, so # would stand out
more as typically indicating a lambda. (The #{...} syntax then remains
comparatively desirable in the specific case that the set literal is
being used as a predicate, as it's both a set and a lambda in that
context.)

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Clojure cheatsheet with tooltips (alpha)

2012-03-24 Thread Andy Fingerhut

There are still some problems with this, but it is ready for experimental use,
at least. Alex, please don't put this on clojure.org -- it ain't ready yet.

http://homepage.mac.com/jafingerhut/files/cheatsheet-clj-1.3.0-v1.4-tooltips/cheatsheet-full.html

I found and used TipTip for tooltips [1], because it advertises the ability to
keep the tooltips within the browser window no matter where the cursor is
relative to the window border. I've tweaked a few settings that may cause it
to fail to do this properly sometimes, and there are many cases where the
tooltip appears so close to the cursor that it "flashes" on and off quickly.
As a workaround, try moving the cursor away from the tooltip, but still
hovering over the link if you can. If anyone knows how to correct those
problems by tweaking the JavaScript code or CSS settings, please let me know.

The tooltips consist of the normal doc strings, with the first line of dashes
removed, and truncated to the first 15 lines if it is longer than that (very
few are). Most links go to clojuredocs.org, as usual.

Give it a test drive and see what you think.

Andy

[1] http://code.drewwilson.com/entry/tiptip-jquery-plugin

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