/// <summary>
/// Removing an attribute
/// </summary>
internal void RemoveAttribute(HAttribute attribute)
{
// If attribute is alone, reset the list
if (attribute.nextAttribute == attribute)
{
this.lastAttribute = null;
}
else
{
// Find previous attribute
var prev = attribute.nextAttribute;
while (prev.nextAttribute != attribute)
{
prev = prev.nextAttribute;
}
// Clean the list
prev.nextAttribute = attribute.nextAttribute;
// If attribute is the last, then prev become the last
if (this.lastAttribute == attribute)
{
this.lastAttribute = prev;
}
}
// Detach attribute
attribute.parent = null;
attribute.nextAttribute = null;
}
/// <summary>
/// Create a new attribute from an other attribute
/// </summary>
/// <param name="other">Attribute to copy from.</param>
/// <exception cref="ArgumentNullException">
/// Throws if the passed attribute is null.
/// </exception>
public HAttribute(HAttribute other)
{
if (other == null)
{
throw new ArgumentNullException("other");
}
this.Name = other.Name;
this.Value = other.Value;
}
/// <summary>
/// Extract classes from an element
/// </summary>
public static String[] GetClasses(this HElement element)
{
HAttribute clsAttr = element != null?element.Attribute("class") : null;
if (clsAttr == null || clsAttr.Value == null)
{
return(new String[0]);
}
return(ExtractClassNames(clsAttr.Value));
}
/// <summary>
/// Remove all attributes
/// </summary>
public void RemoveAttributes()
{
var attr = this.lastAttribute;
while (attr != null)
{
attr.parent = null;
var n = attr.nextAttribute;
attr.nextAttribute = null;
attr = n;
}
this.lastAttribute = null;
}
/// <summary>
/// Create a new element from an another.
/// </summary>
/// <param name="other">
/// Another element that will be copied to this element.
/// </param>
public HElement(HElement other) : base(other)
{
this.Name = other.Name;
HAttribute a = other.lastAttribute;
if (a != null)
{
do
{
a = a.nextAttribute;
AddAttribute(new HAttribute(a));
} while (a != other.lastAttribute);
}
}
/// <summary>
/// Insert a content before the <param name="insert" /> node.
/// </summary>
internal void Insert(HNode insert, object content)
{
if (content == null)
{
return;
}
HNode n = content as HNode;
if (n != null)
{
InsertNode(insert, n);
return;
}
string s = content as string;
if (s != null)
{
InsertString(insert, s);
return;
}
HAttribute a = content as HAttribute;
if (a != null)
{
AddAttribute(a);
return;
}
IEnumerable e = content as IEnumerable;
if (e != null)
{
if (insert == FirstNodeRef)
{
foreach (object obj in e.Cast <Object>().Reverse())
{
Insert(insert, obj);
}
}
else
{
foreach (object obj in e)
{
Insert(insert, obj);
}
}
return;
}
InsertString(insert, content.ToString());
}
/// <summary>
/// Enumerate attributes with an optional name filter.
/// </summary>
/// <param name="name">Name filtered</param>
/// <returns>Enumerate the attributes. If <paramref name="name"/> is null, all attributes are returned.</returns>
IEnumerable <HAttribute> GetAttributes(String name)
{
HAttribute a = lastAttribute;
if (a != null)
{
do
{
a = a.nextAttribute;
if (name == null || String.Equals(a.Name, name, StringComparison.OrdinalIgnoreCase))
{
yield return(a);
}
} while (a.parent == this && a != lastAttribute);
}
}
/// <summary>
/// Returns the <see cref="HAttribute"/> associated with a name.
/// </summary>
/// <param name="name">
/// The name of the <see cref="HAttribute"/> to get.
/// </param>
/// <returns>
/// The <see cref="HAttribute"/> with the name passed in. If there is no attribute
/// with this name then null is returned.
/// </returns>
public HAttribute Attribute(String name)
{
HAttribute a = lastAttribute;
if (name != null && a != null)
{
do
{
a = a.nextAttribute;
if (String.Equals(a.Name, name, StringComparison.OrdinalIgnoreCase))
{
return(a);
}
} while (a != lastAttribute);
}
return(null);
}
/// <summary>
/// Set one attribute for the element.
/// </summary>
/// <param name="element">Element.</param>
/// <param name="name">Attribute name.</param>
/// <param name="value">Attribute value</param>
/// <returns>The element</returns>
public static HElement Attribute(this HElement element, String name, String value)
{
if (element != null && !String.IsNullOrWhiteSpace(name))
{
var attr = element.Attribute(name);
if (String.IsNullOrEmpty(value))
{
if (attr != null)
{
attr.Remove();
}
}
else
{
if (attr == null)
{
attr = new HAttribute(name);
element.Add(attr);
}
attr.Value = value;
}
}
return(element);
}
/// <summary>
/// Adding an attribute
/// </summary>
internal override void AddAttribute(HAttribute attribute)
{
if (Attribute(attribute.Name) != null)
{
throw new InvalidOperationException(String.Format("The attribute '{0}' already defined", attribute.Name));
}
// Attribute already affected in a parent
if (attribute.parent != null)
{
attribute = new HAttribute(attribute);
}
// Insert attribute
attribute.parent = this;
if (lastAttribute == null)
{
attribute.nextAttribute = attribute;
}
else
{
attribute.nextAttribute = lastAttribute.nextAttribute;
lastAttribute.nextAttribute = attribute;
}
lastAttribute = attribute;
}
/// <summary>
/// Internal adding an attribute.
/// </summary>
internal virtual void AddAttribute(HAttribute attribute)
{
}
