OpenEuphoria

1. Beginners-Guide-To-Euphoria Trace and iterations

• Posted by vmars May 15, 2009
• 858 views

I am stepping thru 'A-Beginners-Guide-To-Euphoria-OffLine.htm' from suninyoureye@linuxmail.org . In demo program 43, I am running with trace:

with trace 
   trace(1) 
include get.e 
include wildcard.e 
integer keystroke 
--  
-- ri = find(o,s)  find() searches sequence s for element o.  
--If found, the element number of o is stored in receiving variable ri.  
--If not, 0 is stored in ri. find() starts searching a sequence from the  
--first element onward. 
-- Demo program 43 
include file.e 
sequence string, seek_positions, vowels 
object input_line 
atom file_id, status 
 
vowels = "aeiou" 
 
string = 
"The beauty of the seek() library routine is that you can control\n" & 
"where the next write or read will occur. This will allow you to\n" & 
"update any old information in your file with new data. This eliminates\n" & 
"the need to maintain different versions of the same data in the\n" & 
"file.\n\n" 
 
seek_positions = {} 
for element = 1 to length(string) do 
     if find(string[element],vowels) then 
          seek_positions = append(seek_positions,{element, string[element]}) 
          string[element] = ' ' 
     end if 
end for 
file_id = open("demo.fle","wb") 
puts(file_id,string) 
close(file_id) 

Trace shows that it goes thru ' if find(string[element],vowels) then' once and never gets to: 'seek_positions = append(seek_positions,{element, string[element]}) string[element] = ' ' '

But it has to go thru there, else no correct output. Can Trace be configured so that it shows iterations? Can Trace be configured so that it shows the content of specified variablts?

Thanks!

3. Re: Beginners-Guide-To-Euphoria Trace and iterations

• Posted by vmars May 15, 2009
• 802 views

<quote> f you use the down arrow, then it will not jump back to the top of a loop. If you use the enter key, then it will. Also, you can use the '?' to inspect a particular variable. </quote>

That helps a lot, thanks.

I notice that Trace can't handle indexing:
?string and ?element work fine.
But not string[element] .
Maybe in the future?

Thanks!