Advice for replacing img tags with text in Ruby? - ruby

Question

I'm trying to work out how to store an html table of drive stats in a database, but the developers have been a bit clever, and started using gifs to represent pass/fail/health stats
Here's a snippet of what I've got:
<tr class="status">
<td class="status"><img border="0" src="/tick_green.gif"></td>
<td class="status">8</td>
<td class="status">Ready</td>
<td class="status"><img border="0" src="/bar10.gif"></td>
<td class="status">SEAGATE ST3146807FC</td>
<td class="status">10000 RPM</td>
<td class="status">3HY61AG9</td>
<td class="status">XR12</td>
<td class="status">286749488</td>
<td class="status"> 28.0°C</td>
<td class="status" style="background-color: #00fa00"> 
</td>
**
And here's some of the ruby that I've written so far to strip the tags:
table = page.parser.xpath('//table/caption[contains(.,"Drive")]/..')
table.xpath('//table//tr').each do |row|
row.xpath('td').each do |cell|
puts cell.to_html.gsub(/<a[^>]+>/,'').gsub(/<td[^>]+>/,'').gsub(/<\/td[^>]*>/,'').gsub(/<\/a[^>]*>/,'')
#puts cell.text
end
end
I can now get semi-rational output
<img border="0" src="/tick_green.gif">
15
Ready
<img border="0" src="/bar10.gif">
SEAGATE ST3146807FC
10000 RPM
3HY61ASW
XR12
286749488
29.0°C
 
But I want to replace a couple of other cell elements with other bits
For example, the tick_green can also be '/cross_red.gif' or '/caution.gif' which I want to replace with regular text, likewise, the img bar10.gif, I want to replace with just text of '10'
Is it best to come up with a whole bunch of values for all of my special cases?

Answer 1

I'd do some 'gsub'iing.
E.g.:
example = <<-STRING
<img border="0" src="/tick_green.gif">
15
Ready
<img border="0" src="/bar10.gif">
SEAGATE ST3146807FC
10000 RPM
3HY61ASW
XR12
286749488
29.0°C
 
STRING
replace = Hash.new("#unknown")
replace['tick_green.gif'] = "[OK]"
replace['bar10.gif'] = "[10]"
regex = /<img [^>]* src="\/(.*)">/
result = example.gsub(regex) { replace[$1] }
Somehow the I'd like to replace the $1 with a named backreference, but don't know how yet.
http://ruby-doc.org/core-1.9.3/String.html#method-i-gsub
edit: result from above
[OK]
15
Ready
[10]
SEAGATE ST3146807FC
10000 RPM
3HY61ASW
XR12
286749488
29.0°C
 

Answer 2

A case statement will clean that up a little but:
row.css('td').each do |td|
img = td.at('img')
puts case
when img && img[:src][/bar(\d+)\.gif/] then $1
when img && img[:src][/tick_green/] then 'ok'
else td.text.strip
end
end