From: Logan Capaldo <logancapaldo@...>
Date: 2006-04-04T13:18:22+09:00
Subject: Re: while something do end (was Re: GStreamer Woes)


On Apr 3, 2006, at 10:51 PM, Ryan Davis wrote:

>
> On Apr 3, 2006, at 2:20 PM, Logan Capaldo wrote:
>
>> Frankly I'm confused that
>> while obj.meth do end isn't a syntax error...
>>
>> while 1 do end
>> [...]
>> I tried fiddling with it with ParseTree, but it was less than  
>> enlightening:
>> ParseTree.new.parse_tree(A)[0][3]
>> => [:defn, :m, [:scope, [:block, [:args], [:while, [:call,  
>> [:self], :class], true]]]]
>
> Why are you confused that it isn't a syntax error? Is it simply  
> because of the lack of a semi between do/end?
>
>   while bool-expr [do]
>     body
>   end
>
> Given that body is zero or more expressions, it would seem to me to  
> be perfectly valid as-is.
>
> BTW, there is a much easier way to use ParseTree:
>
> % echo "while 1 do end" | parse_tree_show -f
> (eval):1: warning: literal in condition
> [[:class,
>   :Example,
>   :Object,
>   [:defn, :example, [:scope, [:block, [:args], [:while, [:lit, 1],  
> true]]]]]]
> % echo "while obj.meth do end" | parse_tree_show -f
> [[:class,
>   :Example,
>   :Object,
>   [:defn,
>    :example,
>    [:scope,
>     [:block, [:args], [:while, [:call, [:vcall, :obj], :meth],  
> true]]]]]]
>
> The next release of ParseTree will make it outputs just:
>
> [[:while, [:call, [:vcall, :obj], :meth], true]]
>
> --
> _why: zenspider's most intense moments of solice are immediately  
> following the slaughter [...]
> _why: that topknot's the only thing keeping a lid on the righteous  
> anger
> bricolage: yeah, that and his flagrant obsession with dvorak
>
>

while takes a block argument? I was always under the impression it  
was syntax not a method...