Elij

[Ruby] On help with processing nzb/xml files

2010-01-10T01:30:16-08:00

When dealing with XML there are 2 approaches -- DOM or SAX -- first method loads the entire xml block into a runtime object (REXML::Document.new.) The second gives serial access and should be faster and have an even memory footprint.

Also REXML is notoriously slow -- I'm don't know much about the ruby scene to recommend an alternative but from here it looks like you'll need to move to SAX and something other than REXML.

[Ruby] On Need to remove If else

2009-01-30T13:44:15-08:00

rationalise your object model for teams and members and this'll work

def set_teams_members
	members = get_components(Fees::ITEMS, params[:fee][:teams], params[:teams])
	teams = get_components(MembershipFee::ITEMS, params[:fee][:members], params[:members])

	params[:fee].merge!({ :members => members,
				:teams => teams })

end


def getComponents(items, fee_components, components)
	if fee_components.blank?
		return components
	end

	if items.include?(fee_components)
		return nil
	else
		return fee_components
	end
	
end

[Ruby] On Nested select; is there a better way?

2008-12-11T19:58:20-08:00

not really sure what you mean...

RankHistory.find(:all, :conditions => [ "created_at IN (?)", RankHistory.maximum(:created_at, :group => :id)])

[C#] On Check type is XML Serializable

2008-11-20T01:55:04-08:00

If you have an instance at run time you could do the following

private static bool canBeXmlSerialized(object @object)
{
	return @object is IXmlSerializable || @object.GetType().IsSerializable;
}

[C#] On Strip Html Comments

2008-11-11T04:52:44-08:00

haven't tested -- but if it doesn't work it'll just be a case of reviewing the regex

public static class HtmlHelper {
    public static string StripHtmlComments(string html) {
        if (html == null) {
            throw new ArgumentNullException("html");
        }

        System.Text.RegularExpressions.Regex regex =
             new System.Text.RegularExpressions.Regex("((<!-- )((?!<!-- ).)*( -->))");

        return regex.Replace(html, string.Empty);
        }
}

[Ruby] On Pretty output of permission bits for a file

2008-11-07T00:08:06-08:00

Not much difference -- but what the hey!

def convert(file)
	output = [""]

	File.stat(file).mode.to_s(8).slice(-3..-1).split('').each do |m|
	    permbit = m.to_i
	    output << genflag(permbit, 4, "r")
	    output << genflag(permbit, 2, "w")
	    output << genflag(permbit, 1, "x")
	end
  output.flatten!
	if File.directory?(file) then output[0] = "d"; end
	if File.file?(file) then output[0] = "-"; end
	if File.symlink?(file) then output[0] = "l"; end
	if File.setuid?(file) then output[3] = "s"; end
	if File.setgid?(file) then output[6] = "s"; end
	if File.sticky?(file) 
		if output[3] && output[6] == "-"
			output[9] = "T"
		else
			output[9] = "t"
		end
	end
	puts output.flatten.to_s
end

def genflag(permbit, bit, perm)
    if ((permbit & bit) == bit)
        then [perm]
        else ["-"]
    end
end

convert('poop')

[Bash] On Groupping with stats

2008-11-01T18:29:44-07:00

It's straight forward to do this with sort/uniq -- see below -- if you need to inject the colon use awk or sed

tail -1000000 process.log | grep 'PROCESSING N' | cut -d: -f2 | sort | uniq -c

[C#] On Parse Relative Date

2008-09-11T06:16:37-07:00

Please note I haven't tested/tried to build this -- same logic but with a bit of reuse

using System;
using System.Text.RegularExpressions;

class RelativeDateParser
    {
        
        public static DateTime Parse(string input)
        {
            DateTime dt = DateTime.Now;

            // parse "x days x hours x minutes x seconds" or "x days x hours x minutes x seconds ago"
            Regex r = new Regex("(day)|(hour)|(minues)|(second)");
            if (r.Match(input).Success == true)
            {
                dt = ParseDHMS(input, dt);
            }

            // parse "yesterday" or "today" or "tomorrow" or "eow" or "eod"
            r = new Regex("(today)|(tomorrow)|(eow)|(eod)");
            if (r.Match(input).Success == true)
            {
                dt = ParseGenericRelative(input);
            }

            Console.WriteLine("Now DateTime: " + DateTime.Now.ToString());
            Console.WriteLine("New DateTime: " + dt.ToString());
            return dt;
        }

        private static DateTime ParseGenericRelative(string input)
        {
            throw new NotImplementedException("Not implemented");
        }
        
        private static DateTime ParseDHMS(string input, DateTime seedDtm)
        {
            TimeSpan timeSpan = new TimeSpan(0);
            
            // search for days
            timeSpan += TimeSpan.FromDays(getMetricValue(input, "day"));
            // search for hours
            timeSpan += TimeSpan.FromHours(getMetricValue(input, "hour"));
            // search for minutes
            timeSpan += TimeSpan.FromMinutes(getMetricValue(input, "minutes"));
            // search for seconds
            timeSpan += TimeSpan.FromSeconds(getMetricValue(input, "second"));
            
            return seedDtm.AddTicks(timeSpan.Ticks * (int)(input.EndsWith("ago") ? -1 : 1));
        }
        
        private static double getMetricValue(string input, string metric)
        {
            Regex r = new Regex(@"(\d+)\s*" + metric);
            Match m = r.Match(input);
            if (m.Success)
            {
                string match = m.Groups[1].Value;
                return Double.Parse(match);
            }
            
            return 0;
        }
    }

[Ruby] On Think this needs a loop

2008-09-06T20:18:19-07:00

@songs = {}
feed = RssParser.run("http://ws.audioscrobbler.com/1.0/user/me/recenttracks.rss")
feed[:items].each { |item| @songs[item[:title]] = item[:link] }

<ul id="lastfm_update_list">
	<% @songs.each do |title, link| %>			
		<li><%= link_to title, link %></li>
	<% end %>
</ul>

[C#] On Traversing a List and collecting a property to a CommaString as an Extension Method on List

2008-07-09T05:20:40-07:00

If linq is an option (.net 3.5)

List<Item> items = new List<Item>();

string descriptions = string.Join(",", items.Select(item => item.Description).ToArray());

[JavaScript] On How to Refactor from a Loop... to no Loops...

2007-12-31T10:49:04-08:00

bit hacky...

<html>
<head>   
<title>My Experiment</title>   


<script type="text/javascript" language="javascript">    
    function updateResult() {   
    var result=0; 
       
var items = document.getElementsByTagName("input");

var current = 1;
for(i = 0; i < items.length; i++)
{
var item = items[i];
if(item.className != "cbitem")
continue;
if(item.checked) {
result += parseInt(document.getElementById("tf"+current).value);
}
document.getElementById('result').innerHTML = result;
current++;
}
}

</script>
   
</head>
    
<body>  
<form>
<p> <input type="checkbox" id="cb1" onClick="updateResult()" class="cbitem" />  
    <input type="textfield" id="tf1" value="10" onkeyup="updateResult()"/>
</p> 
 
<p><input type="checkbox" id="cb2" onClick="updateResult()" class="cbitem" />  
    <input type="textfield" id="tf2" value="5" onkeyup="updateResult()"/>
 </p> 

<p>  
    <input type="checkbox" id="cb3" onClick="updateResult()" class="cbitem" />  
    <input type="textfield" id="tf3" value="20" onkeyup="updateResult()" />   
</p>
    
<p>    
    Total Result: <span id="result">0</span>
</p>
   
</form>
</body>
</html>

[Ruby] On why does this puke?

2007-12-20T08:18:49-08:00

It doesn't include the pipe character so the regular expression (to determine ABS or REL URI) is failing -- might be worth submitting a patch upstream if I'm right.

grep -n UNRESERVED /usr/lib/ruby/1.8/uri/common.rb

[Python] On Count word occurrences in a string

2007-12-08T08:58:20-08:00

The regex needs some work -- but this does the same as yours...

import re

def getWordFrequencies(text):
    frequencies = {}
    
    for c in re.split('\W+', text):
        frequencies[c] = (frequencies[c] if frequencies.has_key(c) else 0) + 1
            
    return frequencies


mamaMia = \
"Mamma mia, here I go again\
Mamma mia, here I go again\
My my, how can I resist you?\
Mamma mia, does it show again?\
My my, just how much I've missed you"

result = getWordFrequencies(mamaMia)

for word, freq in result.iteritems():
    print freq, "\t", word

[Java] On Swing GridBagLayout in calculator App

2007-11-21T05:08:50-08:00

I've demonstrated using fall through's

However you could use delegates instead of a switch statement...

		GridBagConstraints c = new GridBagConstraints();
		c.insets.bottom = 2;
		c.insets.top = 2;
		c.insets.left = 2;
		c.insets.right = 2;
		

		JTextArea area = new JTextArea();
		c.weighty = 1;
		panel.add(area, c);
		c.weighty = 0;
		
		for (int i = 9; i >= 1; i--) {
			switch (i) {
			case 9:
			case 6:
			case 3:
				c.gridx = 2;
				c.gridy++;
				break;
			case 8:
			case 7:
			case 5:
			case 4:
			case 2:
			case 1:
				c.gridx--;
				break;
			}
			
			panel.add(new JButton(String.valueOf(i)), c);
		}