|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace Microsoft.Xml
{
using System;
using System.Diagnostics;
using System.Text;
using Microsoft.Xml.XPath;
// Provides text-manipulation methods that are used by several classes.
public abstract class XmlCharacterData : XmlLinkedNode
{
private string _data;
//base(doc) will throw exception if doc is null.
protected internal XmlCharacterData(string data, XmlDocument doc) : base(doc)
{
_data = data;
}
// Gets or sets the value of the node.
public override String Value
{
get { return Data; }
set { Data = value; }
}
// Gets or sets the concatenated values of the node and
// all its children.
public override string InnerText
{
get { return Value; }
set { Value = value; }
}
// Contains this node's data.
public virtual string Data
{
get
{
if (_data != null)
{
return _data;
}
else
{
return String.Empty;
}
}
set
{
XmlNode parent = ParentNode;
XmlNodeChangedEventArgs args = GetEventArgs(this, parent, parent, _data, value, XmlNodeChangedAction.Change);
if (args != null)
BeforeEvent(args);
_data = value;
if (args != null)
AfterEvent(args);
}
}
// Gets the length of the data, in characters.
public virtual int Length
{
get
{
if (_data != null)
{
return _data.Length;
}
return 0;
}
}
// Retrieves a substring of the full string from the specified range.
public virtual String Substring(int offset, int count)
{
int len = _data != null ? _data.Length : 0;
if (len > 0)
{
if (len < (offset + count))
{
count = len - offset;
}
return _data.Substring(offset, count);
}
return String.Empty;
}
// Appends the specified string to the end of the character
// data of the node.
public virtual void AppendData(String strData)
{
XmlNode parent = ParentNode;
int capacity = _data != null ? _data.Length : 0;
if (strData != null) capacity += strData.Length;
string newValue = new StringBuilder(capacity).Append(_data).Append(strData).ToString();
XmlNodeChangedEventArgs args = GetEventArgs(this, parent, parent, _data, newValue, XmlNodeChangedAction.Change);
if (args != null)
BeforeEvent(args);
_data = newValue;
if (args != null)
AfterEvent(args);
}
// Insert the specified string at the specified character offset.
public virtual void InsertData(int offset, string strData)
{
XmlNode parent = ParentNode;
int capacity = _data != null ? _data.Length : 0;
if (strData != null) capacity += strData.Length;
string newValue = new StringBuilder(capacity).Append(_data).Insert(offset, strData).ToString();
XmlNodeChangedEventArgs args = GetEventArgs(this, parent, parent, _data, newValue, XmlNodeChangedAction.Change);
if (args != null)
BeforeEvent(args);
_data = newValue;
if (args != null)
AfterEvent(args);
}
// Remove a range of characters from the node.
public virtual void DeleteData(int offset, int count)
{
//Debug.Assert(offset >= 0 && offset <= Length);
int len = _data != null ? _data.Length : 0;
if (len > 0)
{
if (len < (offset + count))
{
count = Math.Max(len - offset, 0);
}
}
string newValue = new StringBuilder(_data).Remove(offset, count).ToString();
XmlNode parent = ParentNode;
XmlNodeChangedEventArgs args = GetEventArgs(this, parent, parent, _data, newValue, XmlNodeChangedAction.Change);
if (args != null)
BeforeEvent(args);
_data = newValue;
if (args != null)
AfterEvent(args);
}
// Replace the specified number of characters starting at the specified offset with the
// specified string.
public virtual void ReplaceData(int offset, int count, String strData)
{
//Debug.Assert(offset >= 0 && offset <= Length);
int len = _data != null ? _data.Length : 0;
if (len > 0)
{
if (len < (offset + count))
{
count = Math.Max(len - offset, 0);
}
}
StringBuilder temp = new StringBuilder(_data).Remove(offset, count);
string newValue = temp.Insert(offset, strData).ToString();
XmlNode parent = ParentNode;
XmlNodeChangedEventArgs args = GetEventArgs(this, parent, parent, _data, newValue, XmlNodeChangedAction.Change);
if (args != null)
BeforeEvent(args);
_data = newValue;
if (args != null)
AfterEvent(args);
}
internal bool CheckOnData(string data)
{
return XmlCharType.Instance.IsOnlyWhitespace(data);
}
internal bool DecideXPNodeTypeForTextNodes(XmlNode node, ref XPathNodeType xnt)
{
//returns true - if all siblings of the node are processed else returns false.
//The reference XPathNodeType argument being passed in is the watermark that
//changes according to the siblings nodetype and will contain the correct
//nodetype when it returns.
Debug.Assert(XmlDocument.IsTextNode(node.NodeType) || (node.ParentNode != null && node.ParentNode.NodeType == XmlNodeType.EntityReference));
while (node != null)
{
switch (node.NodeType)
{
case XmlNodeType.Whitespace:
break;
case XmlNodeType.SignificantWhitespace:
xnt = XPathNodeType.SignificantWhitespace;
break;
case XmlNodeType.Text:
case XmlNodeType.CDATA:
xnt = XPathNodeType.Text;
return false;
case XmlNodeType.EntityReference:
if (!DecideXPNodeTypeForTextNodes(node.FirstChild, ref xnt))
{
return false;
}
break;
default:
return false;
}
node = node.NextSibling;
}
return true;
}
}
}
|