Ruby noob

ruby-talk
1

Hi,

I would like to parse a very simple html(index_msg.htm) file described below :

<tr>
   <td>WM_ACTIVATE</td>
   <td>0x0006</td>
   <td></td>
   <td>0x0000</td>
   <td>WM_NULL</td>
</tr>
<tr>
   <td>WM_ACTIVATEAPP</td>
   <td>0x001C</td>
   <td></td>
   <td>0x0001</td>
   <td>WM_CREATE</td>
</tr>
...
  I would like to parse this file and to extract information like this :

enum foo
{
   eWM_ACTIVATE = 0x0006,
   eWM_ACTIVATEAPP = 0x0001,
  ...
};

I am starting with this :

fileIn = File.open("C:/WIKI_CE/index_msg.htm", "r")
fileOut = File.new("C:/WIKI_CE/enumWmMsg.h", "w")

begin
     while (line = fileIn.readline)
         line.chomp
         $stdout.print line
     end
rescue EOFError
     fileIn.close
     fileOut.close
end

but now I am stuck. Should I use regex or how can I compare two string ?

2

mosfet wrote:

Hi,

I would like to parse a very simple html(index_msg.htm) file described below :

<tr>
  <td>WM_ACTIVATE</td>
  <td>0x0006</td>
  <td></td>
  <td>0x0000</td>
  <td>WM_NULL</td>
</tr>
<tr>
  <td>WM_ACTIVATEAPP</td>
  <td>0x001C</td>
  <td></td>
  <td>0x0001</td>
  <td>WM_CREATE</td>
</tr>
...
I would like to parse this file and to extract information like this :

enum foo
{
  eWM_ACTIVATE = 0x0006,
  eWM_ACTIVATEAPP = 0x0001,
...
};

I am starting with this :

fileIn = File.open("C:/WIKI_CE/index_msg.htm", "r")
fileOut = File.new("C:/WIKI_CE/enumWmMsg.h", "w")

begin
    while (line = fileIn.readline)
        line.chomp
        $stdout.print line
    end
rescue EOFError
    fileIn.close
    fileOut.close
end

This should get you started:

···

=====================================================================
require 'rubygems'
require 'scrubyt'

data = Scrubyt::Extractor.define do
   fetch('input.html')

   record do
     var_name 'WM_ACTIVATE'
     code '0x0006'
   end
end

result = data.to_xml.to_s
names = result.scan(/var_name>(.+?)<\/var_name/).flatten
values = result.scan(/code>(.+?)<\/code/).flatten
pairs = names.zip(values)

pairs.each do |name, value|
   puts "e#{name} = #{value}"
end

The XML to array code kind of sucks, in the next version of scRUBYt! you will be able to output the result directly to a hash (or CSV or YAML or some other, more friendly format for such a task).

Cheers,
Peter
__
http://www.rubyrailways.com :: Ruby and Web2.0 blog
http://scrubyt.org :: Ruby web scraping framework
http://rubykitchensink.ca/ :: The indexed archive of all things Ruby

3

1. have a look at hpricot
2. if it's too big for you use regexen with /m flag, and use Regex#scan():

REGEX = /<tr>\s*
<td>(.*?)<\/td>\s*
<td>(.*?)<\/td>
<td>(.*?)</td>
<\/tr>/xm

file_in = File.read("C:/WIKI_CE/index_msg.htm")
File.open("C:/WIKI_CE/enumWmMsg.h", "w") do |file_out|
      file_in.scan(REGEX) do
          file_out.puts $1, $2, $3, $4, $5
      end
    end
end

Notes:
1. we_use_snake_case_for_variable_names
2. Use File.open with block to automatically close the file
3. You'll have the values in $1..$5
4. It seems you are inconsistent - in the first example you chose the
second line, in the other the fourth one.

In any case, Peter's approach will be easier, and more stable.

···

On 3/5/07, mosfet <richom.v@free.fr> wrote:

Hi,

I would like to parse a very simple html(index_msg.htm) file described
below :

<tr>
   <td>WM_ACTIVATE</td>
   <td>0x0006</td>
   <td></td>
   <td>0x0000</td>
   <td>WM_NULL</td>
</tr>
<tr>
   <td>WM_ACTIVATEAPP</td>
   <td>0x001C</td>
   <td></td>
   <td>0x0001</td>
   <td>WM_CREATE</td>
</tr>
...
  I would like to parse this file and to extract information like this :

enum foo
{
   eWM_ACTIVATE = 0x0006,
   eWM_ACTIVATEAPP = 0x0001,
  ...
};

I am starting with this :

fileIn = File.open("C:/WIKI_CE/index_msg.htm", "r")
fileOut = File.new("C:/WIKI_CE/enumWmMsg.h", "w")

begin
     while (line = fileIn.readline)
         line.chomp
         $stdout.print line
     end
rescue EOFError
     fileIn.close
     fileOut.close
end

but now I am stuck. Should I use regex or how can I compare two string ?