Re: is within - a syntax bug?

2004-03-23 Thread Frank Leahy 
On Tuesday, March 23, 2004, at 06:10  AM, 
[EMAIL PROTECTED] wrote:

From: Doug Lerner [EMAIL PROTECTED]
Subject: is within - a syntax bug?
To: How to use Revolution [EMAIL PROTECTED]
Message-ID: [EMAIL PROTECTED]
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This results in a syntax error that what is to the left of within is 
not a
point:

  addToStatus within:   the mouseLoc is within the rect of the 
target
into withinCheck

But rewriting it this way works:

  put the mouseLoc is within the rect of the target into withinCheck
  addToStatus within:   withinCheck
A compiler bug?

doug

No, it's not a compiler bug.

Parsing happens left to right, so in your first statement the compiler 
first evaluated

   addStatus within: 

and decided there was more to evaluate before it could call addStatus.  
Then it evaluated

  the mouseLoc is within the rect of the target

For explanatory purposes, let's assume the intermediate result of this 
statement is true.

then it tried to parse

addStatus within:true

and so it called addStatus with within:true.

And finally it tried to put the result of the addStatus call into the 
variable withinCheck.  But, as addStatus isn't a function the whole 
thing failed because addStatus didn't return anything.

Anytime you have a complicated expression it's better to use multiple 
statements (as you saw), or use parentheses to make sure the compiler 
does things in the order you intend.

Best,
-- Frank
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is within - a syntax bug?

2004-03-22 Thread Doug Lerner 
This results in a syntax error that what is to the left of within is not a
point:

  addToStatus within:   the mouseLoc is within the rect of the target
into withinCheck


But rewriting it this way works:

  put the mouseLoc is within the rect of the target into withinCheck
  addToStatus within:   withinCheck

A compiler bug?

doug

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Re: is within - a syntax bug?

2004-03-22 Thread Jan Schenkel 
--- Doug Lerner [EMAIL PROTECTED] wrote:
 This results in a syntax error that what is to the
 left of within is not a
 point:
 
   addToStatus within:   the mouseLoc is within
 the rect of the target
 into withinCheck
 
 
 But rewriting it this way works:
 
   put the mouseLoc is within the rect of the target
 into withinCheck
   addToStatus within:   withinCheck
 
 A compiler bug?
 
 doug
 

Hi Doug,

I wouldn't call it a compiler bug : the ampersand
(concatenation operator) is stronger thn the 'is
within' function, so the engine interprets your
version as :

  addToStatus (within:   the mouseLoc) is within
the rect of the target into withinCheck

which of course creates a problem because now it
doesn't have a point to check with the 'is within'
operator.
To avoid this, simply recode to :

  addToStatus within:   (the mouseLoc is within
the rect of the target into withinCheck)

Hope this carified things a bit,

Jan Schenkel.

=
As we grow older, we grow both wiser and more foolish at the same time.  (La 
Rochefoucauld)

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Re: is within - a syntax bug?

2004-03-22 Thread Dar Scott 
On Monday, March 22, 2004, at 10:28 PM, Doug Lerner wrote:

This results in a syntax error that what is to the left of within is 
not a
point:

  addToStatus within:   the mouseLoc is within the rect of the 
target
into withinCheck
It looks like your mail may have wrapped this just to point out what is 
wrong.  It looks to me that you left in into withinCheck in your copy 
and paste.

Dar Scott

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Re: is within - a syntax bug?

2004-03-22 Thread Dar Scott 
On Tuesday, March 23, 2004, at 12:03 AM, Dar Scott wrote:

  addToStatus within:   the mouseLoc is within the rect of the 
target
into withinCheck
It looks like your mail may have wrapped this just to point out what 
is wrong.  It looks to me that you left in into withinCheck in your 
copy and paste.
Oh, yeah, and the parentheses thing, too.  -- dar

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