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XML
Parsing

Process an XML document

Given the XML Document:

<shopping>
  <item name="bread" quantity="3" price="2.50"/>
  <item name="milk" quantity="2" price="3.50"/>
</shopping>

Print out the total cost of the items, e.g. $14.50
ruby
#!/usr/bin/env ruby

# needed to parse xml
require 'rexml/document'

# grab the file
file = File.new('shop.xml')

# load it as an xml document
doc = REXML::Document.new(file)

# initialize the total to 0 as a float
total = 0.0

# cycle through the items
doc.elements.each('shopping/item') do |item|

# add the price to the total
total += item.attributes['price'].to_f
end

# round the total to the nearest 0.01
total = (total*100.0).round/100.0

# pad the output with the proper number of trailing 0's
printf "$%.2f\n", total
csharp
System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.LoadXml(
@"<shopping>
<item name='bread' quantity='3' price='2.50'/>
<item name='milk' quantity='2' price='3.50'/>
</shopping>");

string decimalSeparator= System.Globalization.CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator;

double sum=0;

foreach(System.Xml.XmlNode nodo in doc.SelectNodes("/shopping/item")){
sum += int.Parse(nodo.Attributes["quantity"].InnerText) * double.Parse(nodo.Attributes["price"].InnerText.Replace(".",decimalSeparator));
}
Console.WriteLine("{0:#.00}",sum);
Creation

create some XML programmatically

Given the following CSV:

bread,3,2.50
milk,2,3.50

Produce the equivalent information in XML, e.g.:

<shopping>
  <item name="bread" quantity="3" price="2.50" />
  <item name="milk" quantity="2" price="3.50" />
</shopping>
ruby
# gem install builder
require 'builder'

xml = Builder::XmlMarkup.new
xml.shopping do
xml.item(:name => "bread", :quantity => 3, :price => "2.50")
xml.item(:name => "milk", :quantity => 2, :price => "3.50")
end
xml
csharp
string cvs ="bread,3,2.50\nmilk,2,3.50";
IList<string> rows = cvs.Split('\n');

System.Text.StringBuilder sb = new System.Text.StringBuilder("<shopping>");
foreach(string row in rows){
IList<string> data = row.Split(',');
sb.AppendFormat("<item name='{0}' quantity='{1}' price='{2}' />",data[0],data[1],data[2]);
}
sb.Append("</shopping>");