From: Stephen Smith <4fires@...>
Date: 2007-03-31T05:39:46+09:00
Subject: Re: text processing

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Gary,

Thanks for the tip. I love the native pattern matching. I had no idea
regular expressions could be such powerful objects. And I can't think of a
good reason not to use Ruby around the house from now on. I'm going to sit
down with a book tonight.

And I killed the internal array, btw. I didn't know Ruby iterates through
files as easily as arrays.

This is like going back to school.

Grinning,
Steve

On 3/30/07, Gary Wright <gwtmp01@mac.com> wrote:
>
>
> On Mar 30, 2007, at 3:31 PM, Stephen Smith wrote:
> > line = ""
> > record = ""
> > oldLog = File.open("filename.txt")
> > newLog = File.new("filename_formatted.csv", "w")
> > hdr = "field1, field2, field3,...."
> > newLog << hdr
> > arr = oldLog.readlines
> > arr.each do |line|
> > record <<
> > /(.{8})(.{6})(.{15})(.{3})(.{30})(.{4})(.{15})(.{1})(.{12})(.
> > {9})/.match(line).captures.join(',')
> > << "\n"
> > newLogg << record
> > record = ""
> > end
>
> How about making it so you don't have to type that pattern next time:
>
> def columns(*widths)
>    Regexp.new(widths.map {|count| "(.{#{count}})" }.join)
> end
> pattern = columns(6,15,3,30,4,15,1,12,9)
>
> You also can get rid of the intermediate strings and the potentially
> huge
> internal array (from slurping up your oldLog into an array):
>
> oldLog.each { |line|
>    newLog.print pattern.match(line).captures.join(',')
> }
>
>

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