parse tilde delimited file

[monte]

Hello, I need to parse a tilde delimited file and output it to a
tabbed delimited file. Example file example.txt

data1~data2~dat a3~data4
data5~data6~dat a7~data8

I need to extract data2, data4, data6 and data8 from the above file
and output it to a file delimited by tabs:

data2 data4 data6 data8

I know how to do the ouput but the parsing I'm not sure about. Thanks
for your help. Monte.

[John Harrison]

Re: parse tilde delimited file


"monte" <olveram7@yahoo .com> wrote in message
news:ac124f78.0 409210446.73b4e 811@posting.goo gle.com...[color=blue]
> Hello, I need to parse a tilde delimited file and output it to a
> tabbed delimited file. Example file example.txt
>
> data1~data2~dat a3~data4
> data5~data6~dat a7~data8
>
> I need to extract data2, data4, data6 and data8 from the above file
> and output it to a file delimited by tabs:
>
> data2 data4 data6 data8
>
> I know how to do the ouput but the parsing I'm not sure about. Thanks
> for your help. Monte.[/color]

Actually you have two sets of delimiters, end of line and ~. So you need two
nested loops, the outer reading lines and the inner reading ~ delimited
text.

How about this (untested)

std::string line;
while (getline(file, line))
{
std::istringstr eam buffer(line);
std::string data;
while (getine(buffer, data, '~'))
{
// do something with data
}
}

john

[Dietmar Kuehl]

Re: parse tilde delimited file

> Actually you have two sets of delimiters, end of line and ~. So you
need two[color=blue]
> nested loops, the outer reading lines and the inner reading ~[/color]
delimited[color=blue]
> text.[/color]

If all what needs to be done is replacing the tilde characters by tab
characters, I would just do that:

| #include <fstream>
| #include <algorithm>
| #include <iterator>
| int main() {
| std::ifstream in("in.file");
| std::ofstream out("out.file") ;
| std::replace_co py(std::istream buf_iterator<ch ar>(in),
| std::istreambuf _iterator<char> (),
| std::ostreambuf _iterator<char> (out),
| '~', '\t');
| }

If speed does matter, you will need a good standard C++ library
implementation for this or you might indeed want to read and
process individual lines. However, 'std::getline() 'ing a line and
'std::replace() 'ing the tilde characters should do the trick.
--
<mailto:dietmar _kuehl@yahoo.co m> <http://www.dietmar-kuehl.de/>
<http://www.contendix.c om> - Software Development & Consulting

[Mike Smith]

Re: parse tilde delimited file

monte wrote:
[color=blue]
> Hello, I need to parse a tilde delimited file and output it to a
> tabbed delimited file. Example file example.txt[/color]

Oh, that's right - it's September. How could I have forgotten?

--
Mike Smith