From: b1_ __ <lists@...>
Date: 2012-08-03T17:39:15+09:00
Subject: Having difficulty processing text files - some techniques?

I am trying to extract information from a po-ker hand history text file
as an exercise in learning RegExp and ruby file manipulation classes IO
and File.

The way the hand history text file is set out is like so:

Hand No. xxxx - Date xxxx Time xxxx
Game type: xxxx Blinds level: xxxx
Table type: xxx
Player 1: xxxx (chip count)
Player 2: xxxx (chip count)
Player 3: xxxx (chip count)
Player 4: xxxx (chip count)
Hole Cards Phase
Player 1 calls
Player 2 raise
Player 3 folds
Flop Phase
Player 1 raises
Player 2 calls
Turn Phase
etc
etc
River Phase
etc
etc
Player 2 wins



In my testing I have extracted successfully the very simple statistic of
VP$IP, which is the percentage of times a player Voluntarily Puts $ In
Pot pre-flop. So this is:

Number of time called or raise pre-flop / Number of hands at the table

My code (I used what I think is a Finite State Machine?):

File.open("test_read.txt") do |f|

  count = 0
  state = nil

  while (line = f.gets)
    case (state)
    when nil
      # Look for the words "Hole Cards" and if found turn on text
processing
      if (line.match(/Hole Cards/))
        state = :parsing
      end
    when :parsing
      # Look for word "Flop" or "wins" and if found stop processing text
      if (line.match(/Flop/)) || (line.match(/wins/))
        state = nil
      else
        if (line.match(/#{name} calls/)) || (line.match(/#{name}
raises/)) then count += 1 end
      end
    end
  end

  return count

end

This code processes text only when inside the Hole Card phase (pre-flop
phase) between lines with words "Hole Cards" (start text processing) and
"Flop" or "wins" (stop processing text). It increments a counter if it
finds the words "calls" and "raises" next to a player's name. This code
ran through the whole file, maybe over hundreds of hands, and extracted
the data.

The problem I am having is that I need to have the extracted data
associate with hand data. Hand data might be the date of the hand was
played, the number of players in the hand, the blind level. This means I
need isolate each hand, extract the hand data and put it in a hash for
example, then extract stats like VP$IP for each player (a hand-by-hand
approach rather than a file-wide approach). So the output might go into
a text file specific to each player that would look like:

Player 1
    VP$IP   2P  3P  4P  All  HandsAtTables
2012-07-23    3  201  21  225  534
2012-07-24    45  10  3  58  1001
2012-07-25     5  5  5  15  420

Can I do this without storing data in arrays or objects? I've been
thinking I can use another Finite State Machine, only look for the words
"Hand" (start of hand) and "wins" (end of hand), the problem is I need
some of the data on the line that has the word "Hand" on it, something I
can't do with my code above. I also need to switch between hands when
there are no lines between the word "wins" and the next line which will
have the word "Hands" on it indicating the start of the next hand.

I have been looking at Gregory Brown's Ruby Best Practices chapter 4
(http://majesticseacreature.com/rbp-book/pdfs/ch04.pdf) on text
processing methods but cannot get my head around his code.

Thx if you can help.

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