Hi Paul,
Here is the copy of a mail I exchanged with Chipp off-list that might
interest you (and all):
Le 25 janv. 06 à 13:29, Eric Chatonet a écrit :
Found the following in Bugzilla with an interesting comment from Mark:
Bugzilla 2694 by [EMAIL PROTECTED] (Scott Slaugh)
<snip>
------- Additional Comment
#1 From
Mark Waddingham
2005-03-17 05:10 -------
This isn't a bug, but just a classic parsing ambiguity (it's called the
'dangling else' problem)
If-Then-Else constructs in Revolution come in several flavours:
1) if <cond> then <conseq> else <alt>
2) if <cond> then <conseq>
else <alt>
3) if <cond> then <conseq>
else
<alt>
end if
4) if <cond> then
<conseq>
else <alt>
5) if <cond> then
<conseq> else <alt>
6) if <cond> then
<conseq>
else
<alt>
end if
7) if <cond> then
<conseq>
end if
8) if <cond> then <conseq>
If you take a look at your code, then the last command before the
else is what
you want to be of form (8), however Revolution notices the next token
is an
'else' followed by a newline so assumes it to be of form (6) - thus
it expects
an extra 'end if'.
Basically, you have an 'else' dangling after an 'if' that could
belong to either
the outer 'if' or the inner 'if'. As is standard practice in all other
languages, Revolution binds the else to the innermost 'if' statment.
You can get around this, however, by putting a new line after the
final if
statement:
if ... then
if .... then ...
else
end if
Le 25 janv. 06 à 15:54, [EMAIL PROTECTED] a écrit :
Chipp,
I have the same experience with nested conditionals. I have found
the following format (with the "then" below the "if") helps.
if tResult is "Error"
then
answer "Go Ahead anyway" with "Cancel" or "OK"
if it is "Cancel" then exit to top
end if
There is sometimes still a problem, especially if the nested
conditional contains an "else" - so I always close these with an
"end if":
if tResult is "Error"
then
answer "Go Ahead anyway" with "Cancel" or "OK"
if it is "Cancel"
then
exit to top
else
doElseStuff
end if
end if
It takes more space but I find it is easier to read - and it always
compiles.
Paul Looney
Best Regards from Paris,
Eric Chatonet
------------------------------------------------------------------------
----------------------
http://www.sosmartsoftware.com/ [EMAIL PROTECTED]/
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