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28 total

On This Page:

  1. 1 Use Tweetstream in Ruby
  2. 2 Anchor a footer to the bottom of a page
  3. 3 linux mmap cpp
  4. 4 JavaScript: Changing an Element's text content
  5. 5 Grep Rails log file targeting particular client/action
  1. 6 Apache IP2Location
  2. 7 Deep' in Ruby
  3. 8 Selected Code
  4. 9 To aligh text in SVG apply the text-align style within the text style attribute
  5. 10 Private IP Detection

Use Tweetstream in Ruby

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// description of your code here

Successfully installed yajl-ruby-0.6.3
Successfully installed daemons-1.0.10
Successfully installed intridea-tweetstream-0.1.3
3 gems installed
Installing ri documentation for yajl-ruby-0.6.3...
Installing ri documentation for daemons-1.0.10...
Installing RDoc documentation for yajl-ruby-0.6.3...
Installing RDoc documentation for daemons-1.0.10...


require 'rubygems'
require 'tweetstream'

user, pass = 'jrobertson', 'secret'
TweetStream::Client.new(user,pass).sample do |status|
  puts "[#{status.user.screen_name}] #{status.text}" 
  sleep 0.5
end

Anchor a footer to the bottom of a page

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/* file: layout.css */

* {
  margin:0;
  padding:0;
}
html,body {
  margin:0;
  padding:0;
  height:100%; /* needed for container min-height */
  background:gray;
  
  font-family:arial,sans-serif;
  font-size:small;
  color:#666;
}

div#frame {
  position:relative; /* needed for footer positioning*/
  margin:0 auto; /* center, not in IE5 */
  width:750px;
  background:#f0f0f0;
  
  height:auto !important; /* real browsers */
  height:100%; /* IE6: treaded as min-height*/

  min-height:100%; /* real browsers */
}

  div#footer {
    position:absolute;
    width:100%;
    bottom:0; /* stick to bottom */
    background:#ddd;
    border-top:6px double gray;
  }

  div#footer p {
    padding:1em;
    margin:0;
  }

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linux mmap cpp

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linux mmap cpp

#ifndef _MMAP_H_20090819_
#define _MMAP_H_20090819_
#include <sys/stat.h>
#include <sys/time.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>

class mmap_t {
        protected:
                int _fd;
                size_t _size;
                const char *_filename;
                char *_ptr;
                int _oflag;

                int _fileresize(size_t size) {
                        if(size==0 || _fd==-1 || _oflag==O_RDONLY) return -1;
                        if(ftruncate(_fd, size)==-1) return -1;
                        _size = size;
                        return 0;
                }
                void _closefd() {
                        if(_fd != -1)
                                ::close(_fd);
                        _fd = -1;
                        _filename = 0;
                        _oflag = 0;
                }
                void _destroy() {
                        if(_ptr != 0) {
                                msync((caddr_t)_ptr, 0, MS_ASYNC);
                                munmap((caddr_t)_ptr, _size);
                                _ptr = 0;
                                _size = 0;
                        }
                }

        public:
                mmap_t():_fd(-1),_size(0),_filename(0),_ptr(0),_oflag(0) {}
                ~mmap_t() {this->close();}

                size_t size() {
                        return _size;
                }
                char *ptr() {
                        return _ptr;
                }
                int open(const char *file, bool write_able = false, size_t size = 0, const mode_t perm_mode = 0644) {
                        this->close();
                        this->_filename = file;

                        if(write_able)
                                _oflag = O_RDWR|O_CREAT;
                        else
                                _oflag = O_RDONLY;

                        struct stat st;

                        if((_fd=::open(file, _oflag, perm_mode))<0)
                                return -1;

                        if(fstat(_fd, &st) != 0)
                                return -1;

                        _size = st.st_size;
                        if(size>0 && _size!=size && _fileresize(size)!=0) return -1;
                        if(_size==0) return -1;
int prot = PROT_READ;
                        if(_oflag&O_RDWR) prot |= PROT_WRITE;
                        _ptr = (char*) mmap(NULL, _size, prot, MAP_FILE|MAP_SHARED, _fd, 0);
                        if(_ptr==MAP_FAILED) return -1;

                        return 0;
                }

                int resize(size_t size) {
                        if(size==0) return -1;
                        this->_destroy();
                        if(_fileresize(size)!=0) return -1;
                        int prot = PROT_READ;
                        if(_oflag&O_RDWR) prot |= PROT_WRITE;
                        _ptr = (char*) mmap(NULL, _size, prot, MAP_SHARED, _fd, 0);
                        if(_ptr==MAP_FAILED) return -1;
                        return 0;
                }
                int close() {
                        this->_destroy();
                        this->_closefd();
                        return 0;
                }
                int flush() {
                        if(_ptr==0) return -1;
                        if(msync(_ptr, _size, MS_ASYNC)==-1)
                                return -1;
                        return 0;
                }
};

#endif

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JavaScript: Changing an Element's text content

to apache php mysql find awk email ruby rails time date perl regex shell http osx css python calendar google input html bash windows sql activerecord javascript java actionscript rubyonrails unix linux fixtures database textmate c text XSLT image string location xml swing copy xmlhttprequest array onload tags web url function math json io download parser imagemagick utf8 dos hash convert batch rectangle binary C++ map jpeg delicious series60 rexml camera zoom zope by Jekky on Mar 12, 2010
It is possible to set the text, to cope with various browsers from IE 4,
5, 6, Netscape 6, 7, Mozilla, Opera 7, 8 and other DOM compliant
browsers you can use:

function setInnerText (elementId, text) {

  var element;

  if (document.getElementById) {
    element = document.getElementById(elementId);
  }

  else if (document.all) {
    element = document.all[elementId];
  }

  if (element) {

    if (typeof element.textContent != 'undefined') {
      element.textContent = text;
    }

    else if (typeof element.innerText != 'undefined') {
      element.innerText = text;
    }

    else if (typeof element.removeChild != 'undefined') {

      while (element.hasChildNodes()) {
        element.removeChild(element.lastChild);
      }

      element.appendChild(document.createTextNode(text));
    }
  }
}

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Grep Rails log file targeting particular client/action

to apache php mysql find awk email ruby rails time date perl regex shell http osx css python calendar google input html bash windows sql activerecord javascript java actionscript rubyonrails unix linux fixtures database textmate c text XSLT image string location xml swing copy xmlhttprequest array onload tags web url function math json io download parser imagemagick utf8 dos hash convert batch rectangle binary C++ map jpeg delicious series60 rexml camera zoom zope by Jekky on Mar 10, 2010 
#!/usr/bin/env ruby

if ARGV.empty?
  puts <<-USAGE
Use like tail -f log/production.log | #{ $PROGRAM_NAME } request_regexp

Examples:

Show only local requests:
tail -f log/production.log | #{ $PROGRAM_NAME } 127.0.0.1

Show only GET requests:
tail -f log/production.log | #{ $PROGRAM_NAME } GET

Show only requests to /updates path:
tail -f log/production.log | #{ $PROGRAM_NAME } /updates
  USAGE
  exit(0)
end

request_regexp = /#{ ARGV[0] }/

STDIN.slice_before(/Started (GET|POST|PUT|DELETE)/).each do |request_log|
  puts request_log if request_log.first =~ request_regexp
end

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Apache IP2Location

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// description of your code here

static const int ENV_SET_MODE    = 0x0001;
static const int NOTES_SET_MODE  = 0x0002;
static const int ALL_SET_MODE    = 0x0003;

typedef struct {
                int enableFlag;
                int setMode; 
                char* dbFile;
                IP2Location* ip2locObj;
} ip2location_server_config;

module AP_MODULE_DECLARE_DATA IP2Location_module;

static apr_status_t ip2location_cleanup(void *cfgdata) {
   // cleanup code here, if needed
   return APR_SUCCESS;
}

static void ip2location_child_init(apr_pool_t *p, server_rec *s) {
   apr_pool_cleanup_register(p, NULL, ip2location_cleanup, ip2location_cleanup);
}

static int ip2location_post_read_request(request_rec *r) {
                char* ipaddr;
                ip2location_server_config* config;
                IP2LocationRecord* record;
                char buff[20];
                
                config = (ip2location_server_config*)
                                                                                               ap_get_module_config(r->server->module_config, &IP2Location_module);
                
                if(!config->enableFlag)
                                return OK;
                
                ipaddr = r->connection->remote_ip;
                record = IP2Location_get_all(config->ip2locObj, ipaddr);
                if(record) {
                                if(config->setMode & ENV_SET_MODE) {
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_COUNTRY_SHORT", record->country_short); 
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_COUNTRY_LONG", record->country_long); 
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_REGION", record->region); 
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_CITY", record->city); 
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_ISP", record->isp); 
                                                sprintf(buff, "%f", record->latitude);
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_LATITUDE", buff); 
                                                sprintf(buff, "%f", record->longitude);
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_LONGITUDE", buff); 
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_DOMAIN", record->domain); 
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_ZIPCODE", record->zipcode); 
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_TIMEZONE", record->timezone); 
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_NETSPEED", record->netspeed);
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_IDDCODE", record->iddcode);
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_AREACODE", record->areacode);
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_WEATHERSTATIONCODE", record->weatherstationcode);
                                                apr_table_set(r->subprocess_env, "IP2LOCATION_WEATHERSTATIONNAME", record->weatherstationname);
                                }
                                if(config->setMode & NOTES_SET_MODE) {
                                                apr_table_set(r->notes, "IP2LOCATION_COUNTRY_SHORT", record->country_short); 
                                                apr_table_set(r->notes, "IP2LOCATION_COUNTRY_LONG", record->country_long); 
                                                apr_table_set(r->notes, "IP2LOCATION_REGION", record->region); 
                                                apr_table_set(r->notes, "IP2LOCATION_CITY", record->city); 
                                                apr_table_set(r->notes, "IP2LOCATION_ISP", record->isp); 
                                                sprintf(buff, "%f", record->latitude);
                                                apr_table_set(r->notes, "IP2LOCATION_LATITUDE", buff); 
                                                sprintf(buff, "%f", record->longitude);
                                                apr_table_set(r->notes, "IP2LOCATION_LONGITUDE", buff); 
                                                apr_table_set(r->notes, "IP2LOCATION_DOMAIN", record->domain); 
                                                apr_table_set(r->notes, "IP2LOCATION_ZIPCODE", record->zipcode); 
                                                apr_table_set(r->notes, "IP2LOCATION_TIMEZONE", record->timezone); 
                                                apr_table_set(r->notes, "IP2LOCATION_NETSPEED", record->netspeed);
                                                apr_table_set(r->notes, "IP2LOCATION_IDDCODE", record->iddcode);
                                                apr_table_set(r->notes, "IP2LOCATION_AREACODE", record->areacode);
                                                apr_table_set(r->notes, "IP2LOCATION_WEATHERSTATIONCODE", record->weatherstationcode);
                                               apr_table_set(r->notes, "IP2LOCATION_WEATHERSTATIONNAME", record->weatherstationname);
                                }
                
                                IP2Location_free_record(record);                           
                }
                
                return OK;
}

static const char* set_ip2location_enable(cmd_parms *cmd, void *dummy, int arg) {
                ip2location_server_config* config = (ip2location_server_config*)
                                                                                                                                                                                                                                                                                                                ap_get_module_config(cmd->server->module_config, &IP2Location_module);
  if(!config) 
                return NULL;
  
  config->enableFlag = arg;
  return NULL;
}

static const char* set_ip2location_dbfile(cmd_parms* cmd, void* dummy, const char* dbFile, int arg) {
  ip2location_server_config* config = (ip2location_server_config*)
                                                                                                                                                                                                                                                                                                ap_get_module_config(cmd->server->module_config, &IP2Location_module);
                if(!config) 
                                return NULL;
                                
                config->dbFile = apr_pstrdup(cmd->pool, dbFile);
                if(config->enableFlag) {
                                config->ip2locObj = IP2Location_open(config->dbFile); 
                                if(!config->ip2locObj)
                                                return "Error opening dbFile!";
                }
                
                return NULL; 
}

static const char* set_ip2location_set_mode(cmd_parms* cmd, void* dummy, const char* mode, int arg) {
                ip2location_server_config* config = (ip2location_server_config*)
                                                                                                                                                                                                                                                                                                ap_get_module_config(cmd->server->module_config, &IP2Location_module);
                if(!config) 
                                return NULL;
                
                if(strcmp(mode, "ALL") == 0)      
                                config->setMode = ALL_SET_MODE;
                else if(strcmp(mode, "ENV") == 0)           
                                config->setMode = ENV_SET_MODE;
                else if(strcmp(mode, "NOTES") == 0)
                                config->setMode = NOTES_SET_MODE;                
                else
                                return "Invalid mode for IP2LocationSetMode";
                
                return NULL; 
}

static void* ip2location_create_svr_conf(apr_pool_t* pool, server_rec* svr) {
  ip2location_server_config* svr_cfg = apr_pcalloc(pool, sizeof(ip2location_server_config));
                svr_cfg->enableFlag = 0;
                svr_cfg->dbFile = NULL;
                svr_cfg->setMode = ALL_SET_MODE;
                svr_cfg->ip2locObj = NULL;
  return svr_cfg ;
}

static const command_rec ip2location_cmds[] = {
   AP_INIT_FLAG( "IP2LocationEnable", set_ip2location_enable, NULL, OR_FILEINFO, "Turn on mod_ip2location"),
   AP_INIT_TAKE1( "IP2LocationDBFile", set_ip2location_dbfile, NULL, OR_FILEINFO, "File path to DB file"),
   AP_INIT_TAKE1( "IP2LocationSetMode", set_ip2location_set_mode, NULL, OR_FILEINFO, "Set scope mode"),
   {NULL} 
};

static void ip2location_register_hooks(apr_pool_t *p) {
                ap_hook_post_read_request( ip2location_post_read_request, NULL, NULL, APR_HOOK_MIDDLE );
                ap_hook_child_init(        ip2location_child_init, NULL, NULL, APR_HOOK_MIDDLE );

}

// API hooks
module AP_MODULE_DECLARE_DATA IP2Location_module = {
   STANDARD20_MODULE_STUFF, 
   NULL,                        /* create per-dir    config structures */
   NULL,                        /* merge  per-dir    config structures */
   ip2location_create_svr_conf, /* create per-server config structures */
   NULL,                        /* merge  per-server config structures */
   ip2location_cmds,            /* table of config file commands       */
   ip2location_register_hooks   /* register hooks                      */
};




Deep' in Ruby

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// description of your code here

#!/usr/local/bin/ruby

##!/opt/local/bin/ruby1.9

# Update Ruby via MacPorts:
# port info ruby19
# sudo port install ruby19


# See:
# - Tailin' Ruby, http://judofyr.net/posts/tailin-ruby.html
# - Re: Ruby and recursion (Ackermann benchmark), http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/145593

class Class
  # Sweet stuff!
  def tailcall_optimize( *methods )
    methods.each do |meth|
      org = instance_method( meth )
      define_method( meth ) do |*args|
        if Thread.current[ meth ]
          throw( :recurse, args )
        else
          Thread.current[ meth ] = org.bind( self )
          result = catch( :done ) do
            loop do
              args = catch( :recurse ) do
                throw( :done, Thread.current[ meth ].call( *args ) )
              end
            end
          end
          Thread.current[ meth ] = nil
          result
        end
      end
    end
  end
end



# tail-call optimization test

# example 1

class TCOTest
  # tail-recursive factorial
  def fact( n, acc = 1 )
    if n < 2 then acc else fact( n-1, n*acc ) end
  end

  # length of factorial
  def fact_size( n )
    fact( n ).size
  rescue
    $!
  end   
end

t = TCOTest.new

# normal method
puts t.fact_size( 10000 )  # => stack level too deep

# enable tail-call optimization
class TCOTest
  tailcall_optimize :fact
end

# tail-call optimized method
puts t.fact_size( 10000 )  # => 14808                                  


# example 2

class TCOTest2
   def addnum(i) 
      p i
      addnum(i+1) 
   end
end


#TCOTest2.new.addnum 0   # stack level too deep (SystemStackError)

# enable tail-call optimization
class TCOTest2
  tailcall_optimize :addnum
end

TCOTest2.new.addnum 0

Selected Code

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// description of your code here

/// <summary>
    /// Selected Items Facade
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class Selected<T>
    {
        /// <summary>
        /// Gets selected items as T from the specified list box.
        /// </summary>
        /// <param name="listBox">The list box.</param>
        /// <returns></returns>
        public static IEnumerable<T> From(ListBox listBox)
        {
            List<T> result = new List<T>();

            foreach (T item in listBox.SelectedItems)
            {
                result.Add(item);
            }

            return result;
        }

        /// <summary>
        /// Gets selected item as T from the specified combo box.
        /// </summary>
        /// <param name="comboBox">The combo box.</param>
        /// <returns></returns>
        public static T From(ComboBox comboBox)
        {
            return comboBox.SelectedIndex > -1
                       ? (T) comboBox.Items[comboBox.SelectedIndex]
                       : default(T);
        }
    }

To aligh text in SVG apply the text-align style within the text style attribute

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// description of your code here

<g
   inkscape:label="Layer 1"
   inkscape:groupmode="layer"
   id="layer1">
  <rect
     style="fill:#ff3700;fill-opacity:1"
     id="rect2888"
     width="52.468475"
     height="2.3319323"
     x="94.312019"
     y="57.362206" />
  <text
     xml:space="preserve"
     style="font-size:13.05882072px;font-style:normal;font-weight:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
     x="94.043755"
     y="76.981842"
     id="text2884-8"
     sodipodi:linespacing="125%"><tspan
       sodipodi:role="line"
       id="tspan2886-0"
       x="94.043755"
       y="76.981842">text07</tspan></text>
  <rect
     style="fill:#ff3700;fill-opacity:1"
     id="rect2888-3"
     width="52.468475"
     height="2.3319323"
     x="94.312019"
     y="83.013474" />

  <rect
     style="fill:#ff3700;fill-opacity:1"
     id="rect2888-5"
     width="52.468475"
     height="2.3319323"
     x="94.312019"
     y="108.6647" />
  <rect
     style="fill:#ff3700;fill-opacity:1"
     id="rect2888-1"
     width="52.468475"
     height="2.3319323"
     x="94.312019"
     y="134.31596" />
  <text
     xml:space="preserve"
     style="font-size:13.05882072px;font-style:normal;font-weight:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
     x="94.043755"
     y="102.34161"
     id="text2884-8-1"
     sodipodi:linespacing="125%"><tspan
       sodipodi:role="line"
       id="tspan2886-0-3"
       x="94.043755"
       y="102.34161">text07</tspan></text>
  <text
     xml:space="preserve"
     style="font-size:13.05882072px;font-style:normal;font-weight:normal;text-align:end;line-height:125%;writing-mode:lr-tb;text-anchor:end;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
     x="94.043755"
     y="127.70137"
     id="text2884-8-3"
     sodipodi:linespacing="125%"><tspan
       sodipodi:role="line"
       id="tspan2886-0-2"
       x="94.043755"
       y="127.70137">text07</tspan></text>
</g>

Private IP Detection

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// description of your code here

Extending IPAddr:

require 'ipaddr'
class IPAddr
  PrivateRanges = [
    IPAddr.new("10.0.0.0/8"),
    IPAddr.new("172.16.0.0/12"),
    IPAddr.new("192.168.0.0/16")
  ]
  
  def private?
    return false unless self.ipv4?
    PrivateRanges.each do |ipr|
      return true if ipr.include?(self)
    end
    return false
  end

  def public?
    !private?
  end
end



TestCase:

require 'ipaddr'

class IpResolutionTest < Test::Unit::TestCase
  def ip(ipaddr)
    IPAddr.new(ipaddr)
  end
  
  def self.should_be_public_ip(ip)
    should "identify #{ip} as being public" do
      ip(ip).should be_public
    end
  end

  def self.should_be_private_ip(ip)
    should "identify #{ip} as being private" do
      ip(ip).should be_private
    end
  end
  
  context "Ip Resolution" do
    should_be_public_ip "9.255.255.255"
    should_be_public_ip "11.0.0.0"

    (0..5).each do |r1|
      (0..5).each do |r2| 
        should_be_private_ip "10.#{r1*50}.#{r2*50}.10"
      end
    end

    should_be_public_ip "172.15.255.255"
    should_be_public_ip "172.32.0.0"

    (16..31).each do |r1|
      (0..5).each do |r2| 
        should_be_private_ip "172.#{r1}.#{r2*50}.10"
      end
    end

    should_be_public_ip "192.167.255.255"
    should_be_public_ip "192.169.0.0"

    (0..5).each do |r1|
      (0..5).each do |r2| 
        should_be_private_ip "192.168.#{r1*50}.#{r2*50}"
      end
    end
  end
end





28 total

On This Page:

  1. 1 Use Tweetstream in Ruby
  2. 2 Anchor a footer to the bottom of a page
  3. 3 linux mmap cpp
  4. 4 JavaScript: Changing an Element's text content
  5. 5 Grep Rails log file targeting particular client/action
  1. 6 Apache IP2Location
  2. 7 Deep' in Ruby
  3. 8 Selected Code
  4. 9 To aligh text in SVG apply the text-align style within the text style attribute
  5. 10 Private IP Detection