OpenEuphoria

Re: Two Sort Challenges

• Posted by Al Getz <Xaxo at aol.com> Mar 20, 2006
• 472 views

Derek Parnell wrote:
> 
> Al Getz wrote:
> > 
> > Hello there,
> > 
> > 
> > Here's a sort challenge for anyone that's interested...
> 
> Source Code: ----------------------------
> }}}
<eucode>
> include sort.e
> 
> -- This routine formats the file into tuples in preparation for sorting.
> function GetData(sequence pFileName)
> -- returns sequence:Records in the format { category, detail }
>     integer lFH
>     sequence lRecords
>     object lLine
>     sequence lCategory
>     integer lDetailCount
> 
> 
>     -- Use stdin if no filename supplied.
>     if length(pFileName) = 0 then
>         lFH = 0
>     else
>         lFH = open(pFileName, "r")
>     end if
> 
>     if lFH < 0 then
>         puts(2, "Could not open file '" & pFileName & "'")
>         abort(1)
>     end if
> 
> 
>     lRecords = {}
>     lCategory = ""
>     lDetailCount = 0
>     lLine = gets(lFH)
>     while sequence(lLine) do
>         -- Strip off trailing LF
>         if lLine[$] = '\n' then
>             lLine = lLine[1..$-1]
>         end if
> 
>         if length(lLine) = 0 then
>             -- An empty line means a change of category.
>             if lDetailCount = 0 and length(lCategory) > 0 then
>                 -- Empty category
>                 lRecords = append( lRecords, {lCategory, ""} )
>             end if
>             lCategory = ""
>         elsif length(lCategory) = 0 then
>             -- A non-empty line is sortable data. Its a category if there
>             -- is not already a known category, otherwise its a detail.
>             lCategory = lLine
>             lLine = ""
>             lDetailCount = 0
>         end if
> 
>         if length(lLine) > 0 and length(lCategory) > 0 then
>             -- If I have both a detail and a category then add to records
>             lRecords = append( lRecords, {lCategory, lLine} )
>             lDetailCount += 1
>         end if
> 
>         lLine = gets(lFH)
>     end while
> 
>     if lDetailCount = 0 and length(lCategory) > 0 then
>         -- Empty category
>         lRecords = append( lRecords, {lCategory, ""} )
>     end if
> 
>     if length(pFileName) != 0 then
>         close(lFH)
>     end if
> 
>     return lRecords
> end function
> 
> -- This routine formats the sorted data into the required format of
> --  <Category 1>
> --  <Detail 1>
> --  <Detail 2>
> --  <Detail ...>
> --  <Detail n>
> --
> --  <Category 2>
> --  <Detail 1>
> --  <Detail 2>
> --  <Detail ...>
> --  <Detail n>
> 
> procedure PrintData(sequence pData, sequence pFileName)
>     sequence lCategory
>     integer lFH
> 
>     -- If no filename specified then use stdout.
>     if length(pFileName) = 0 then
>         lFH = 1
>     else
>         lFH = open(pFileName, "w")
>     end if
> 
>     if lFH < 0 then
>         puts(2, "Could not open file '" & pFileName & "'")
>         abort(1)
>     end if
> 
> 
>     lCategory = ""
>     for i = 1 to length(pData) do
>         if equal(lCategory, pData[i][1]) = 0 then
>             -- Change of category so output an empty line.
>             if length(lCategory) > 0 then
>                 puts(lFH, '\n')
>             end if
>             -- Store new category and print it.
>             lCategory = pData[i][1]
<snip>

Hi Derek,

Thanks, i'll try it out on my rather large data file next.


Take care,
Al

And, good luck with your Euphoria programming!

My bumper sticker: "I brake for LED's"

 From "Black Knight":
"I can live with losing the good fight,
 but i can not live without fighting it".