From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2009-12-03T04:52:35+09:00
Subject: Re: Need help with writefile line ranges within extensive file

On Wed, Dec 2, 2009 at 8:15 PM, Alpha Blue <jdezenzio@gmail.com> wrote:
> Hi Everyone,
>
> I have the following file that I started to work on:
>
> class EuiiiReader
>
>  def initialize(writefile,filename)
>    @writefile = writefile
>    @filename = filename
>    @provnum = /^\d{1,4}\=\{/
>  end
>
>  def readfile
>    File.open(@filename, "r") do |infile|
>      @linenumarray = []
>      while (line = infile.gets)
>        if (line =~ @provnum)
>          linenum = $.
>          @linenumarray += [linenum]
>        end
>      end
>    end
>  end
>
>  def writefile
>    open(@writefile, "w") { |f|
>      f.puts "Verifying File..."
>      f.puts "================="
>      File.open(@filename, "r") do |infile|
>        while (line = infile.gets)
>        # Need help here
>        # @linenumarray contains all of the starting file lines
>        # I need to output the lines + 8 lines after each one listed in
> the array to an output file
>        f.puts "Something to do here"
>        end
>      end
>    }
>  end
> end
>
> k = EuiiiReader.new('compare.txt', 'Italy_alternate.eu3')
> k.readfile
> k.writefile
>
> =============
>
> Here is my issue.  I'm still trying to get better with utilizing Ruby in
> various situations.  Since I read a lot of files and love file readers,
> I thought I would concentrate on this.
>
> I have a simple saved game file from Europa Universallis III which
> contains approximately 850,000 lines.  The saved game file is currently
> corrupt and I believe I know the issue and need to have a more permanent
> fix in place for if it happens again.
>
> The file will look something similar in certain segments:
>
> ....
>
> 1={
>    flags={
>    }
>    variables={
>    }
>    name="Stockholm"
>    owner="SCA"
>    controller="SCA"
>    core="SWE"
>    core="SCA"
>    culture=swedish
>
> ....
>
> My class above starts with reading the entire file and locating province
> number lines for 1={, 2={, etc. etc. to say 1894={.  When it finds these
> lines, it stores the line numbers into an array called @linenumarray.
> This is done in the readfile method.
>
> In the writefile method, I need to output to file the line and the next
> 8 lines after it for every line number stored in the array.  So, the
> file would be written to:
>
> Verifying File...
> =================
> 1={
>    flags={
>    }
>    variables={
>    }
>    name="Stockholm"
>    owner="SCA"
>    controller="SCA"
>    core="SWE"
> 2={
>    flags={
>    }
>    variables={
>    }
>    name="Stockholm"
>    owner="SCA"
>    controller="SCA"
>    core="SWE"
> etc....
>
> My problem is I don't know how to pull the line number from the array
> and attach another 8 lines to it.  The commented section in the
> writefile method is where the placement should occur.
>
> Again, as this is a learning process for me, whatever best practices
> should be used instead of what I've written would also be greatly
> appreciated.  I want to make sure I simplify and expand upon my
> knowledge and not do things incorrectly.  As ruby is a wonderful
> language with many ways of achieving an end result, I might be taking a
> more sloppy approach and for that I apologize.
>
> Any help would be greatly appreciated.
>
> Thanks,
> --
> Posted via http://www.ruby-forum.com/.
>
>

I don't know if you need the line numbers for anything else, or if you
actually need to read the file and calculate things and then write as
a separate method, but if that's not the case you can do this in a
single pass through the infile:

irb(main):033:0> File.open("resulteuiii.txt", "w") do |f|
irb(main):034:1* File.open("dataeuiii.txt") do |infile|
irb(main):035:2* while (line = infile.gets)
irb(main):036:3> if line =~ /^\d{1,4}\=\{/
irb(main):037:4> f.puts line
irb(main):038:4> 8.times {f.puts infile.gets}
irb(main):039:4> end
irb(main):040:3> end
irb(main):041:2> end


Hope this helps,

Jesus.