/// <summary>
/// Inserts a new child node before the reference node passed.
/// </summary>
/// <param name="Node">The new child node to add. This may not be already childed to another node</param>
/// <param name="After">The reference node. This must be a child of the current node</param>
/// <returns>The added node</returns>
public virtual BBCodeNode InsertBefore(BBCodeNode Node, BBCodeNode Before)
{
if (Singular)
{
throw new InvalidOperationException("Cannot add children to a singular node");
}
if (Node == null)
{
throw new ArgumentNullException("Node may not be null");
}
if (Before == null)
{
throw new ArgumentNullException("After may not be null");
}
if (Node.Parent != null)
{
throw new ArgumentException("The Node provided is already a child of another node");
}
if (Before.Parent == null || Before.Parent != this)
{
throw new ArgumentException("The Before node provided is not a child of this node");
}
children.Insert(children.IndexOf(Before), Node);
return(Node);
}
/// <summary>
/// Adds a new child node at the end of this node's descendants
/// </summary>
/// <param name="TagName">The node's tag name. Mandatory.</param>
/// <param name="Attribute">The node's optional attribute. This may be an empty string or null.</param>
/// <returns>The newly created child node</returns>
public virtual BBCodeNode AppendChild(string TagName, string Attribute)
{
var node = new BBCodeNode(TagName, Attribute)
{
Parent = this,
};
return(AppendChild(node));
}
/// <summary>
/// Creates a recursive copy of the current nodes and its children
/// </summary>
/// <returns>A deep clone of the current node</returns>
public virtual object Clone()
{
BBCodeNode node = new BBCodeNode(TagName, Attribute);
foreach (var Child in Children)
{
node.AppendChild((BBCodeNode)Child.Clone());
}
return(node);
}
/// <summary>
/// Removes a specific child node
/// </summary>
/// <param name="Node">The child node to remove. This must be a child of the current node.</param>
/// <returns>The removed node</returns>
public virtual BBCodeNode RemoveChild(BBCodeNode Node)
{
if (Node == null)
{
throw new ArgumentNullException("Node may not be null");
}
if (Node.Parent != null)
{
throw new ArgumentException("The BBCodeNode provided is not a child of this node");
}
children.Remove(Node);
return(Node);
}
/// <summary>
/// Adds a new child node at the beginning of this node's descendants
/// </summary>
/// <param name="Node">The existing BBCodeNode to add. This may not already be childed to another node.</param>
/// <returns>The node passed</returns>
public virtual BBCodeNode PrependChild(BBCodeNode Node)
{
if (Singular)
{
throw new InvalidOperationException("Cannot add children to a singular node");
}
if (Node == null)
{
throw new ArgumentNullException("Node may not be null");
}
if (Node.Parent != null)
{
throw new ArgumentException("The BBCodeNode provided is already a child of another node");
}
children.Insert(0, Node);
return(Node);
}
/// <summary>
/// Replaces a specific child node with another
/// </summary>
/// <param name="Old">The node to remove. This must be a child of this node</param>
/// <param name="New">The replacement node. This may not already be childed to another node</param>
/// <returns>The removed node</returns>
public virtual BBCodeNode ReplaceChild(BBCodeNode Old, BBCodeNode New)
{
if (Old == null || New == null)
{
throw new ArgumentNullException("Arguments may not be null");
}
if (Old.Parent != this)
{
throw new ArgumentException("The Old node provided is not a child of this node");
}
if (New.Parent != null)
{
throw new ArgumentException("The New node provided is a child of another node");
}
int index = children.IndexOf(Old);
children.Remove(Old);
children.Insert(index, New);
return(Old);
}
/// <summary>
/// Loads a string of BBCode as a BBCodeDocument object
/// </summary>
/// <param name="BBCode">A string of BBCode text</param>
/// <param name="ThrowOnError">Whether to throw an exception on parse error. If false, the error is ignored</param>
/// <param name="SingularTags">A list of tags which should be considered singular by the parser. Singular tags are self closing and may not have children.</param>
/// <returns>The DOM representation of the text</returns>
public static BBCodeDocument Load(string BBCode, bool ThrowOnError, IEnumerable<string> SingularTags)
{
BBCodeDocument document = new BBCodeDocument();
Stack<BBCodeNode> nodestack = new Stack<BBCodeNode>();
nodestack.Push(document);
// iterate through all characters in text
for (int i = 0; i < BBCode.Length; i++)
{
// the character is not a tag
if (BBCode[i] != '[')
AddPlainText(document, nodestack, BBCode[i].ToString());
// beginning of a tag
else
{
// if we have an open text node, close it.
if ((nodestack.Peek() as BBCodeTextNode) != null)
nodestack.Pop();
StringBuilder TagName = new StringBuilder();
i++;
// edge case where there is an [ as the last character
if (i == BBCode.Length)
{
if (ThrowOnError)
throw new BBCodeParseException("Reached end of document while reading tag", i);
AddPlainText(document, nodestack, "[" + TagName.ToString());
continue;
}
bool IsClosing = BBCode[i] == '/';
if (IsClosing)
i++;
// read in the entire tagname
while (i < BBCode.Length && char.IsLetter(BBCode[i]))
TagName.Append(BBCode[i++]);
if (i == BBCode.Length)
break;
// reached the end of tagname, handle accordingly
if (!IsClosing && (BBCode[i] == '=' || BBCode[i] == ']'))
{
// this fixes exception thrown when user inputs []
if (string.IsNullOrEmpty(TagName.ToString()))
continue;
var el = new BBCodeNode(TagName.ToString(), "", SingularTags.Contains(TagName.ToString()));
nodestack.Peek().AppendChild(el);
if (!el.Singular)
nodestack.Push(el);
if (BBCode[i] == ']')
continue;
// skip over the equals sign so we don't accidentally read it into the attribute
if (BBCode[i] == '=')
i++;
StringBuilder Attribute = new StringBuilder();
while (i < BBCode.Length && BBCode[i] != ']')
Attribute.Append(BBCode[i++]);
el.Attribute = Attribute.ToString();
}
else if (IsClosing && BBCode[i] == ']')
{
if (nodestack.Count == 0 || nodestack.Peek().TagName != TagName.ToString())
{
if (ThrowOnError)
throw new BBCodeParseException("Unmatched closing tag", i);
AddPlainText(document, nodestack, "[/" + TagName.ToString() + "]");
continue;
}
nodestack.Pop();
}
else
{
// edge case where encountering something like: [[i] would cause the [i] tag not to be read properly
if (BBCode[i] == '[')
i--;
// illegal character in tag name
if (ThrowOnError)
throw new BBCodeParseException("Illegal character in tag name", i);
// if ThrowOnError is false, we'll just add it as plain text.
AddPlainText(document, nodestack, "[" + TagName.ToString()); // prepend the [ char which started the tag
}
}
}
// close up a final text node if it exists:
if ((nodestack.Peek() as BBCodeTextNode) != null)
nodestack.Pop();
// close the body tag if it's the next one
if ((nodestack.Peek() as BBCodeDocument) != null)
nodestack.Pop();
if (nodestack.Count > 0 && ThrowOnError)
throw new BBCodeParseException("Reached end of document with " + (nodestack.Count-1).ToString() + " unclosed tags", BBCode.Length);
return document;
}
/// <summary>
/// Replaces a specific child node with another
/// </summary>
/// <param name="Old">The node to remove. This must be a child of this node</param>
/// <param name="New">The replacement node. This may not already be childed to another node</param>
/// <returns>The removed node</returns>
public virtual BBCodeNode ReplaceChild(BBCodeNode Old, BBCodeNode New)
{
if (Old == null || New == null)
throw new ArgumentNullException("Arguments may not be null");
if (Old.Parent != this)
throw new ArgumentException("The Old node provided is not a child of this node");
if (New.Parent != null)
throw new ArgumentException("The New node provided is a child of another node");
int index = children.IndexOf(Old);
children.Remove(Old);
children.Insert(index, New);
return Old;
}
/// <summary>
/// Removes a specific child node
/// </summary>
/// <param name="Node">The child node to remove. This must be a child of the current node.</param>
/// <returns>The removed node</returns>
public virtual BBCodeNode RemoveChild(BBCodeNode Node)
{
if (Node == null)
throw new ArgumentNullException("Node may not be null");
if (Node.Parent != null)
throw new ArgumentException("The BBCodeNode provided is not a child of this node");
children.Remove(Node);
return Node;
}
/// <summary>
/// Adds a new child node at the beginning of this node's descendants
/// </summary>
/// <param name="Node">The existing BBCodeNode to add. This may not already be childed to another node.</param>
/// <returns>The node passed</returns>
public virtual BBCodeNode PrependChild(BBCodeNode Node)
{
if (Singular)
throw new InvalidOperationException("Cannot add children to a singular node");
if (Node == null)
throw new ArgumentNullException("Node may not be null");
if (Node.Parent != null)
throw new ArgumentException("The BBCodeNode provided is already a child of another node");
children.Insert(0, Node);
return Node;
}
/// <summary>
/// Inserts a new child node before the reference node passed.
/// </summary>
/// <param name="Node">The new child node to add. This may not be already childed to another node</param>
/// <param name="After">The reference node. This must be a child of the current node</param>
/// <returns>The added node</returns>
public virtual BBCodeNode InsertBefore(BBCodeNode Node, BBCodeNode Before)
{
if (Singular)
throw new InvalidOperationException("Cannot add children to a singular node");
if(Node == null)
throw new ArgumentNullException("Node may not be null");
if(Before == null)
throw new ArgumentNullException("After may not be null");
if (Node.Parent != null)
throw new ArgumentException("The Node provided is already a child of another node");
if (Before.Parent == null || Before.Parent != this)
throw new ArgumentException("The Before node provided is not a child of this node");
children.Insert(children.IndexOf(Before), Node);
return Node;
}
/// <summary>
/// Creates a recursive copy of the current nodes and its children
/// </summary>
/// <returns>A deep clone of the current node</returns>
public virtual object Clone()
{
BBCodeNode node = new BBCodeNode(TagName, Attribute);
foreach (var Child in Children)
node.AppendChild((BBCodeNode)Child.Clone());
return node;
}
/// <summary>
/// Adds a new child node at the end of this node's descendants
/// </summary>
/// <param name="TagName">The node's tag name. Mandatory.</param>
/// <param name="Attribute">The node's optional attribute. This may be an empty string or null.</param>
/// <returns>The newly created child node</returns>
public virtual BBCodeNode AppendChild(string TagName, string Attribute)
{
var node = new BBCodeNode(TagName, Attribute)
{
Parent = this,
};
return AppendChild(node);
}
/// <summary>
/// Loads a string of BBCode as a BBCodeDocument object
/// </summary>
/// <param name="BBCode">A string of BBCode text</param>
/// <param name="ThrowOnError">Whether to throw an exception on parse error. If false, the error is ignored</param>
/// <param name="SingularTags">A list of tags which should be considered singular by the parser. Singular tags are self closing and may not have children.</param>
/// <returns>The DOM representation of the text</returns>
public static BBCodeDocument Load(string BBCode, bool ThrowOnError, IEnumerable <string> SingularTags)
{
BBCodeDocument document = new BBCodeDocument();
Stack <BBCodeNode> nodestack = new Stack <BBCodeNode>();
nodestack.Push(document);
// iterate through all characters in text
for (int i = 0; i < BBCode.Length; i++)
{
// the character is not a tag
if (BBCode[i] != '[')
{
AddPlainText(document, nodestack, BBCode[i].ToString());
}
// beginning of a tag
else
{
// if we have an open text node, close it.
if ((nodestack.Peek() as BBCodeTextNode) != null)
{
nodestack.Pop();
}
StringBuilder TagName = new StringBuilder();
i++;
// edge case where there is an [ as the last character
if (i == BBCode.Length)
{
if (ThrowOnError)
{
throw new BBCodeParseException("Reached end of document while reading tag", i);
}
AddPlainText(document, nodestack, "[" + TagName.ToString());
continue;
}
bool IsClosing = BBCode[i] == '/';
if (IsClosing)
{
i++;
}
// read in the entire tagname
while (i < BBCode.Length && char.IsLetter(BBCode[i]))
{
TagName.Append(BBCode[i++]);
}
if (i == BBCode.Length)
{
break;
}
// reached the end of tagname, handle accordingly
if (!IsClosing && (BBCode[i] == '=' || BBCode[i] == ']'))
{
var el = new BBCodeNode(TagName.ToString(), "", SingularTags.Contains(TagName.ToString()));
nodestack.Peek().AppendChild(el);
if (!el.Singular)
{
nodestack.Push(el);
}
if (BBCode[i] == ']')
{
continue;
}
// skip over the equals sign so we don't accidentally read it into the attribute
if (BBCode[i] == '=')
{
i++;
}
StringBuilder Attribute = new StringBuilder();
while (i < BBCode.Length && BBCode[i] != ']')
{
Attribute.Append(BBCode[i++]);
}
el.Attribute = Attribute.ToString();
}
else if (IsClosing && BBCode[i] == ']')
{
if (nodestack.Count == 0 || nodestack.Peek().TagName != TagName.ToString())
{
if (ThrowOnError)
{
throw new BBCodeParseException("Unmatched closing tag", i);
}
AddPlainText(document, nodestack, "[/" + TagName.ToString() + "]");
continue;
}
nodestack.Pop();
}
else
{
// edge case where encountering something like: [[i] would cause the [i] tag not to be read properly
if (BBCode[i] == '[')
{
i--;
}
// illegal character in tag name
if (ThrowOnError)
{
throw new BBCodeParseException("Illegal character in tag name", i);
}
// if ThrowOnError is false, we'll just add it as plain text.
AddPlainText(document, nodestack, "[" + TagName.ToString()); // prepend the [ char which started the tag
}
}
}
// close up a final text node if it exists:
if ((nodestack.Peek() as BBCodeTextNode) != null)
{
nodestack.Pop();
}
// close the body tag if it's the next one
if ((nodestack.Peek() as BBCodeDocument) != null)
{
nodestack.Pop();
}
if (nodestack.Count > 0 && ThrowOnError)
{
throw new BBCodeParseException("Reached end of document with " + (nodestack.Count - 1).ToString() + " unclosed tags", BBCode.Length);
}
return(document);
}
