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Why does Autcomplete work for assignemt (a:=b) but not for comparison (a=b)?

Posted on 2004-09-17
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Last Modified: 2010-04-05




If I'm using AutoComplete (or code sense? ) where it gives a list of
possible variables that can complete a command:

If I am making an ASSIGNMENT (Varabile:=....) then auto complete works
with sys constants like clRed, etc.

If I am making a COMPARISON (if Variable=...) then ac does NOT work with
clRED, vk_RETURN, etc.

Anyone know why this is?

TIA!

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Question by:clay111296
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Wim ten Brink earned 150 total points
ID: 12089157
Probably because the just-in-time compilation isn't as smart as the real compiler. If you use a writeln statement to write to a text file, you could notice something similar. The problem is probable that Delphi just can't determine what variable or type would be valid in this location.
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Author Comment

by:clay111296
ID: 12098770
So, are you saying that the compiler is smarter about ASSIGNMENT statments than it is about COMPARISON statements?

Also, I've tried defining a variable as ColorRef so the compiler KNOWS the variable data type.


EXAMPLE:
var
  clColor: COLORREF;

  begin
  clcolor:=clBlue;  //ON THIS LINE I *DO* GET AUTOCOMPLETE HELP

  if clColor=xy then ShowMessage('it worked');  //ON THIS LINE I DO *NOT* GET AUTOCOMPLETE HELP.

AND YET, I DON'T GET AUTO COMPLETE HELP AFTER THE "=" SIGN.


WORKS IN D6 BUT NOT IN DELPHI 8.

This may be due to an addin called Castalia. Need to test more.


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LVL 17

Expert Comment

by:Wim ten Brink
ID: 12100233
Yep, the compiler is smarter with ASSIGNMENTS because it knows which type to expect. With comparisons, it's a bit more complicated.

Hmmm. Maybe it's related because in your example, one variable is called "Varabile" and the other is called. "Variable". ;-)

I have tried in Delphi 5, though. Code completion with comparisons are a bit mixed up. I could get the Autocomplete combobox bt pressting <CTRL><SPACE> but eben then it does not find the clBlue or other color constant that I want.

The reason seems to be that the background compiler has less problems with assignments than comparisons. That''s all, it seems.
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Author Comment

by:clay111296
ID: 12103643

Further testing with D7


if I do :
clColor=clR     >>>> I get  choices that autocomplete it (clRed, etc.)

If I do
IF clColor=clR  >>>>  I do NOT get choices that autcomplete.

In Delphi 8 (for .net)
I get choices in both cases.

CASTALIA NOT THE CAUSE
Same results with or without Castalia.

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