OpenEuphoria

Re: Isn't this wrong?

• Posted by DerekParnell (admin) Jul 25, 2010
• 1081 views

 
atom retry 

<0025>:: a name is expected here 
atom retry 

The word retry is a reserved word in Eu 4. It can be used inside loops to repeat the current iteration.

 
atom retry2 
retry2 = 0 
 
with trace 
trace(1) 
 
while 1 do 
 
     if retry2 then end 
 
     if 
       
end while 

The 'dangling' if is not really dangling. The IF statement must end with the two words 'end' and 'if' and they do not have to be on the same line.

eg.

-- First statement 
if 
1 
then 
? 1 
end 
if 
 
-- Second statement 
if 1 then ? 1 end if 

Both statements above are identical as far as Eu is concerned.

 
sequence TheWebPage 
TheWebPage = "" 
 
atom retry2 
retry2 = 0 
 
with trace 
trace(1) 
 
while 1 do 
 
 
     if match(upper("<title>404 - Page Not Found</title>"),upper(TheWebPage)) then  
       TheWebPage = "404" 
       exit 
     end 
 
 
     if retry2 then end 
 
     if 
       
end while 

Syntax error - expected to see =, +=, -=, *=, /= or &=\\ 
     if retry2 then end\\ 
                   ^\\ 

<0076>:: expected to see an assignment after 'retry2', such as =, +=, -=, *=, /= 
 or &= 
     if retry2 then end 
                   ^ 

Ok, the error pointer could be improved. Currently the scanner has gotten to the end of the word 'then' and the parser has by now realized that an assignment is required so the error message is correct "expecting to see an assignment" and the '^' pointer is showing you where the scanner is up to. It is sort of saying, "Hey I got 'then' but was expecting some sort of assignment there instead".

Now it was expecting an assignment because the previous IF statement actually uses the 'if' preceding the 'retry2' word as marking the end of the IF statement. Thus 'retry2' is the start of a new statement and the only type of statements that start with a variable are assignment statements.

It seems that you have mistakenly thought that the IF statement was completed by the 'end' word alone, but that is not the case. Look at it laid out differently ...

sequence TheWebPage 
TheWebPage = "" 
 
atom retry2 
retry2 = 0 
 
with trace 
trace(1) 
 
while 1 do 
 
 
     if match(upper("<title>404 - Page Not Found</title>"),upper(TheWebPage)) then  
       TheWebPage = "404" 
       exit 
     end if 
      
     retry2 then end if 
       
end while 

Now is the syntax error obvious?

Just to restate, statements such as IF, WHILE, FOR etc are terminated by a two word combination, and those words do not have to be on the same line. The terminator is 'end' followed by 'if', while', 'for' etc that may or may not be on the same line.