source: trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.EPPlus/3.1.3/EPPlus-3.1.3/XmlHelper.cs @ 11048

/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 * See the GNU Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied. 
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 * 
 * Author             Change                     Date
 * ******************************************************************************
 * Jan Källman        Initial Release            2009-10-01
 * Jan Källman        License changed GPL-->LGPL 2011-12-27
 * Eyal Seagull       Add "CreateComplexNode"    2012-04-03
 * Eyal Seagull       Add "DeleteTopNode"        2012-04-13
 *******************************************************************************/

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using OfficeOpenXml.Style;
using System.IO.Packaging;
using System.Globalization;
using System.IO;
namespace OfficeOpenXml
{
  /// <summary>
  /// Help class containing XML functions. 
  /// Can be Inherited 
  /// </summary>
  public abstract class XmlHelper
  {
    internal delegate int ChangedEventHandler(StyleBase sender, Style.StyleChangeEventArgs e);

    internal XmlHelper(XmlNamespaceManager nameSpaceManager)
    {
      TopNode = null;
      NameSpaceManager = nameSpaceManager;
    }

    internal XmlHelper(XmlNamespaceManager nameSpaceManager, XmlNode topNode)
    {
      TopNode = topNode;
      NameSpaceManager = nameSpaceManager;
    }
    //internal bool ChangedFlag;
    internal XmlNamespaceManager NameSpaceManager { get; set; }
    internal XmlNode TopNode { get; set; }
    string[] _schemaNodeOrder = null;
    /// <summary>
    /// Schema order list
    /// </summary>
    internal string[] SchemaNodeOrder
    {
      get
      {
        return _schemaNodeOrder;
      }
      set
      {
        _schemaNodeOrder = value;
      }
    }
    internal XmlNode CreateNode(string path)
    {
      if (path == "")
        return TopNode;
      else
        return CreateNode(path, false);
    }
    internal XmlNode CreateNode(string path, bool insertFirst)
    {
      XmlNode node = TopNode;
      XmlNode prependNode = null;
      foreach (string subPath in path.Split('/'))
      {
        XmlNode subNode = node.SelectSingleNode(subPath, NameSpaceManager);
        if (subNode == null)
        {
          string nodeName;
          string nodePrefix;

          string nameSpaceURI = "";
          string[] nameSplit = subPath.Split(':');

          if (SchemaNodeOrder != null && subPath[0] != '@')
          {
            insertFirst = false;
            prependNode = GetPrependNode(subPath, node);
          }

          if (nameSplit.Length > 1)
          {
            nodePrefix = nameSplit[0];
            if (nodePrefix[0] == '@') nodePrefix = nodePrefix.Substring(1, nodePrefix.Length - 1);
            nameSpaceURI = NameSpaceManager.LookupNamespace(nodePrefix);
            nodeName = nameSplit[1];
          }
          else
          {
            nodePrefix = "";
            nameSpaceURI = "";
            nodeName = nameSplit[0];
          }
          if (subPath.StartsWith("@"))
          {
            XmlAttribute addedAtt = node.OwnerDocument.CreateAttribute(subPath.Substring(1, subPath.Length - 1), nameSpaceURI);  //nameSpaceURI
            node.Attributes.Append(addedAtt);
          }
          else
          {
            if (nodePrefix == "")
            {
              subNode = node.OwnerDocument.CreateElement(nodeName, nameSpaceURI);
            }
            else
            {
              if (nodePrefix == "" || (node.OwnerDocument != null && node.OwnerDocument.DocumentElement != null && node.OwnerDocument.DocumentElement.NamespaceURI == nameSpaceURI &&
                  node.OwnerDocument.DocumentElement.Prefix == ""))
              {
                subNode = node.OwnerDocument.CreateElement(nodeName, nameSpaceURI);
              }
              else
              {
                subNode = node.OwnerDocument.CreateElement(nodePrefix, nodeName, nameSpaceURI);
              }
            }
            if (prependNode != null)
            {
              node.InsertBefore(subNode, prependNode);
              prependNode = null;
            }
            else if (insertFirst)
            {
              node.PrependChild(subNode);
            }
            else
            {
              node.AppendChild(subNode);
            }
          }
        }
        node = subNode;
      }
      return node;
    }

    /// <summary>
    /// Options to insert a node in the XmlDocument
    /// </summary>
    internal enum eNodeInsertOrder
    {
      /// <summary>
      /// Insert as first node of "topNode"
      /// </summary>
      First,

      /// <summary>
      /// Insert as the last child of "topNode"
      /// </summary>
      Last,

      /// <summary>
      /// Insert after the "referenceNode"
      /// </summary>
      After,

      /// <summary>
      /// Insert before the "referenceNode"
      /// </summary>
      Before,

      /// <summary>
      /// Use the Schema List to insert in the right order. If the Schema list
      /// is null or empty, consider "Last" as the selected option
      /// </summary>
      SchemaOrder
    }

    /// <summary>
    /// Create a complex node. Insert the node according to SchemaOrder
    /// using the TopNode as the parent
    /// </summary>
    /// <param name="path"></param>
    /// <returns></returns>
    internal XmlNode CreateComplexNode(
      string path)
    {
      return CreateComplexNode(
        TopNode,
        path,
        eNodeInsertOrder.SchemaOrder,
        null);
    }

    /// <summary>
    /// Create a complex node. Insert the node according to the <paramref name="path"/>
    /// using the <paramref name="topNode"/> as the parent
    /// </summary>
    /// <param name="topNode"></param>
    /// <param name="path"></param>
    /// <returns></returns>
    internal XmlNode CreateComplexNode(
      XmlNode topNode,
      string path)
    {
      return CreateComplexNode(
        topNode,
        path,
        eNodeInsertOrder.SchemaOrder,
        null);
    }

    /// <summary>
    /// Creates complex XML nodes
    /// </summary>
    /// <remarks>
    /// 1. "d:conditionalFormatting"
    ///   1.1. Creates/find the first "conditionalFormatting" node
    /// 
    /// 2. "d:conditionalFormatting/@sqref"
    ///   2.1. Creates/find the first "conditionalFormatting" node
    ///   2.2. Creates (if not exists) the @sqref attribute
    ///
    /// 3. "d:conditionalFormatting/@id='7'/@sqref='A9:B99'"
    ///   3.1. Creates/find the first "conditionalFormatting" node
    ///   3.2. Creates/update its @id attribute to "7"
    ///   3.3. Creates/update its @sqref attribute to "A9:B99"
    ///
    /// 4. "d:conditionalFormatting[@id='7']/@sqref='X1:X5'"
    ///   4.1. Creates/find the first "conditionalFormatting" node with @id=7
    ///   4.2. Creates/update its @sqref attribute to "X1:X5"
    /// 
    /// 5. "d:conditionalFormatting[@id='7']/@id='8'/@sqref='X1:X5'/d:cfRule/@id='AB'"
    ///   5.1. Creates/find the first "conditionalFormatting" node with @id=7
    ///   5.2. Set its @id attribute to "8"
    ///   5.2. Creates/update its @sqref attribute and set it to "X1:X5"
    ///   5.3. Creates/find the first "cfRule" node (inside the node)
    ///   5.4. Creates/update its @id attribute to "AB"
    /// 
    /// 6. "d:cfRule/@id=''"
    ///   6.1. Creates/find the first "cfRule" node
    ///   6.1. Remove the @id attribute
    /// </remarks>
    /// <param name="topNode"></param>
    /// <param name="path"></param>
    /// <param name="nodeInsertOrder"></param>
    /// <param name="referenceNode"></param>
    /// <returns>The last node creates/found</returns>
    internal XmlNode CreateComplexNode(
      XmlNode topNode,
      string path,
      eNodeInsertOrder nodeInsertOrder,
      XmlNode referenceNode)
    {
      // Path is obrigatory
      if ((path == null) || (path == string.Empty))
      {
        return topNode;
      }

      XmlNode node = topNode;
      string nameSpaceURI = string.Empty;

      //TODO: BUG: when the "path" contains "/" in an attrribue value, it gives an error.

      // Separate the XPath to Nodes and Attributes
      foreach (string subPath in path.Split('/'))
      {
        // The subPath can be any one of those:
        // nodeName
        // x:nodeName
        // nodeName[find criteria]
        // x:nodeName[find criteria]
        // @attribute
        // @attribute='attribute value'

        // Check if the subPath has at least one character
        if (subPath.Length > 0)
        {
          // Check if the subPath is an attribute (with or without value)
          if (subPath.StartsWith("@"))
          {
            // @attribute                   --> Create attribute
            // @attribute=''                --> Remove attribute
            // @attribute='attribute value' --> Create attribute + update value
            string[] attributeSplit = subPath.Split('=');
            string attributeName = attributeSplit[0].Substring(1, attributeSplit[0].Length - 1);
            string attributeValue = null; // Null means no attribute value

            // Check if we have an attribute value to set
            if (attributeSplit.Length > 1)
            {
              // Remove the ' or " from the attribute value
              attributeValue = attributeSplit[1].Replace("'", "").Replace("\"", "");
            }

            // Get the attribute (if exists)
            XmlAttribute attribute = (XmlAttribute)(node.Attributes.GetNamedItem(attributeName));

            // Remove the attribute if value is empty (not null)
            if (attributeValue == string.Empty)
            {
              // Only if the attribute exists
              if (attribute != null)
              {
                node.Attributes.Remove(attribute);
              }
            }
            else
            {
              // Create the attribue if does not exists
              if (attribute == null)
              {
                // Create the attribute
                attribute = node.OwnerDocument.CreateAttribute(
                  attributeName);

                // Add it to the current node
                node.Attributes.Append(attribute);
              }

              // Update the attribute value
              if (attributeValue != null)
              {
                node.Attributes[attributeName].Value = attributeValue;
              }
            }
          }
          else
          {
            // nodeName
            // x:nodeName
            // nodeName[find criteria]
            // x:nodeName[find criteria]

            // Look for the node (with or without filter criteria)
            XmlNode subNode = node.SelectSingleNode(subPath, NameSpaceManager);

            // Check if the node does not exists
            if (subNode == null)
            {
              string nodeName;
              string nodePrefix;
              string[] nameSplit = subPath.Split(':');
              nameSpaceURI = string.Empty;

              // Check if the name has a prefix like "d:nodeName"
              if (nameSplit.Length > 1)
              {
                nodePrefix = nameSplit[0];
                nameSpaceURI = NameSpaceManager.LookupNamespace(nodePrefix);
                nodeName = nameSplit[1];
              }
              else
              {
                nodePrefix = string.Empty;
                nameSpaceURI = string.Empty;
                nodeName = nameSplit[0];
              }

              // Check if we have a criteria part in the node name
              if (nodeName.IndexOf("[") > 0)
              {
                // remove the criteria from the node name
                nodeName = nodeName.Substring(0, nodeName.IndexOf("["));
              }

              if (nodePrefix == string.Empty)
              {
                subNode = node.OwnerDocument.CreateElement(nodeName, nameSpaceURI);
              }
              else
              {
                if (node.OwnerDocument != null
                  && node.OwnerDocument.DocumentElement != null
                  && node.OwnerDocument.DocumentElement.NamespaceURI == nameSpaceURI
                  && node.OwnerDocument.DocumentElement.Prefix == string.Empty)
                {
                  subNode = node.OwnerDocument.CreateElement(
                    nodeName,
                    nameSpaceURI);
                }
                else
                {
                  subNode = node.OwnerDocument.CreateElement(
                    nodePrefix,
                    nodeName,
                    nameSpaceURI);
                }
              }

              // Check if we need to use the "SchemaOrder"
              if (nodeInsertOrder == eNodeInsertOrder.SchemaOrder)
              {
                // Check if the Schema Order List is empty
                if ((SchemaNodeOrder == null) || (SchemaNodeOrder.Length == 0))
                {
                  // Use the "Insert Last" option when Schema Order List is empty
                  nodeInsertOrder = eNodeInsertOrder.Last;
                }
                else
                {
                  // Find the prepend node in order to insert
                  referenceNode = GetPrependNode(nodeName, node);

                  if (referenceNode != null)
                  {
                    nodeInsertOrder = eNodeInsertOrder.Before;
                  }
                  else
                  {
                    nodeInsertOrder = eNodeInsertOrder.Last;
                  }
                }
              }

              switch (nodeInsertOrder)
              {
                case eNodeInsertOrder.After:
                  node.InsertAfter(subNode, referenceNode);
                                    referenceNode = null;
                                    break;

                case eNodeInsertOrder.Before:
                  node.InsertBefore(subNode, referenceNode);
                                    referenceNode = null;
                  break;

                case eNodeInsertOrder.First:
                  node.PrependChild(subNode);
                  break;

                case eNodeInsertOrder.Last:
                  node.AppendChild(subNode);
                  break;
              }
            }

            // Make the newly created node the top node when the rest of the path
            // is being evaluated. So newly created nodes will be the children of the
            // one we just created.
            node = subNode;
          }
        }
      }

      // Return the last created/found node
      return node;
    }

    /// <summary>
    /// return Prepend node
    /// </summary>
    /// <param name="nodeName">name of the node to check</param>
    /// <param name="node">Topnode to check children</param>
    /// <returns></returns>
    private XmlNode GetPrependNode(string nodeName, XmlNode node)
    {
      int pos = GetNodePos(nodeName);
      if (pos < 0)
      {
        return null;
      }
      XmlNode prependNode = null;
      foreach (XmlNode childNode in node.ChildNodes)
      {
        int childPos = GetNodePos(childNode.Name);
        if (childPos > -1)  //Found?
        {
          if (childPos > pos) //Position is before
          {
            prependNode = childNode;
            break;
          }
        }
      }
      return prependNode;
    }
    private int GetNodePos(string nodeName)
    {
      int ix = nodeName.IndexOf(":");
      if (ix > 0)
      {
        nodeName = nodeName.Substring(ix + 1, nodeName.Length - (ix + 1));
      }
      for (int i = 0; i < _schemaNodeOrder.Length; i++)
      {
        if (nodeName == _schemaNodeOrder[i])
        {
          return i;
        }
      }
      return -1;
    }
    internal void DeleteAllNode(string path)
    {
      string[] split = path.Split('/');
      XmlNode node = TopNode;
      foreach (string s in split)
      {
        node = node.SelectSingleNode(s, NameSpaceManager);
        if (node != null)
        {
          if (node is XmlAttribute)
          {
            (node as XmlAttribute).OwnerElement.Attributes.Remove(node as XmlAttribute);
          }
          else
          {
            node.ParentNode.RemoveChild(node);
          }
        }
        else
        {
          break;
        }
      }
    }
    internal void DeleteNode(string path)
    {
      var node = TopNode.SelectSingleNode(path, NameSpaceManager);
      if (node != null)
      {
        if (node is XmlAttribute)
        {
          var att = (XmlAttribute)node;
          att.OwnerElement.Attributes.Remove(att);
        }
        else
        {
          node.ParentNode.RemoveChild(node);
        }
      }
    }
    internal void DeleteTopNode()
    {
      TopNode.ParentNode.RemoveChild(TopNode);
    }
    internal void SetXmlNodeString(string path, string value)
    {
      SetXmlNodeString(TopNode, path, value, false, false);
    }
    internal void SetXmlNodeString(string path, string value, bool removeIfBlank)
    {
      SetXmlNodeString(TopNode, path, value, removeIfBlank, false);
    }
    internal void SetXmlNodeString(XmlNode node, string path, string value)
    {
      SetXmlNodeString(node, path, value, false, false);
    }
    internal void SetXmlNodeString(XmlNode node, string path, string value, bool removeIfBlank)
    {
      SetXmlNodeString(node, path, value, removeIfBlank, false);
    }
    internal void SetXmlNodeString(XmlNode node, string path, string value, bool removeIfBlank, bool insertFirst)
    {
      if (node == null)
      {
        return;
      }
      if (value == "" && removeIfBlank)
      {
        DeleteAllNode(path);
      }
      else
      {
        XmlNode nameNode = node.SelectSingleNode(path, NameSpaceManager);
        if (nameNode == null)
        {
          CreateNode(path, insertFirst);
          nameNode = node.SelectSingleNode(path, NameSpaceManager);
        }
        //if (nameNode.InnerText != value) HasChanged();
        nameNode.InnerText = value;
      }
    }
    internal void SetXmlNodeBool(string path, bool value)
    {
      SetXmlNodeString(TopNode, path, value ? "1" : "0", false, false);
    }
    internal void SetXmlNodeBool(string path, bool value, bool removeIf)
    {
      if (value == removeIf)
      {
        var node = TopNode.SelectSingleNode(path, NameSpaceManager);
        if (node != null)
        {
          if (node is XmlAttribute)
          {
            var elem = (node as XmlAttribute).OwnerElement;
            elem.ParentNode.RemoveChild(elem);
          }
          else
          {
            TopNode.RemoveChild(node);
          }
        }
      }
      else
      {
        SetXmlNodeString(TopNode, path, value ? "1" : "0", false, false);
      }
    }
    internal bool ExistNode(string path)
    {
      if (TopNode == null || TopNode.SelectSingleNode(path, NameSpaceManager) == null)
      {
        return false;
      }
      else
      {
        return true;
      }
    }
    internal bool? GetXmlNodeBoolNullable(string path)
    {
      var value = GetXmlNodeString(path);
      if (string.IsNullOrEmpty(value))
      {
        return null;
      }
      return GetXmlNodeBool(path);
    }
    internal bool GetXmlNodeBool(string path)
    {
      return GetXmlNodeBool(path, false);
    }
    internal bool GetXmlNodeBool(string path, bool blankValue)
    {
      string value = GetXmlNodeString(path);
      if (value == "1" || value == "-1" || value == "True")
      {
        return true;
      }
      else if (value == "")
      {
        return blankValue;
      }
      else
      {
        return false;
      }
    }
    internal int GetXmlNodeInt(string path)
    {
      int i;
      if (int.TryParse(GetXmlNodeString(path), out i))
      {
        return i;
      }
      else
      {
        return int.MinValue;
      }
    }
        internal int? GetXmlNodeIntNull(string path)
        {
            int i;
            string s = GetXmlNodeString(path);
            if (s!="" && int.TryParse(s, out i))
            {
                return i;
            }
            else
            {
                return null;
            }
        }

    internal decimal GetXmlNodeDecimal(string path)
    {
      decimal d;
      if (decimal.TryParse(GetXmlNodeString(path), NumberStyles.Any, CultureInfo.InvariantCulture, out d))
      {
        return d;
      }
      else
      {
        return 0;
      }
    }
    internal double? GetXmlNodeDoubleNull(string path)
    {
      string s = GetXmlNodeString(path);
      if (s == "")
      {
        return null;
      }
      else
      {
        double v;
        if (double.TryParse(s, NumberStyles.Number, CultureInfo.InvariantCulture, out v))
        {
          return v;
        }
        else
        {
          return null;
        }
      }
    }
    internal double GetXmlNodeDouble(string path)
    {
      string s = GetXmlNodeString(path);
      if (s == "")
      {
        return double.NaN;
      }
      else
      {
        double v;
        if (double.TryParse(s, NumberStyles.Number, CultureInfo.InvariantCulture, out v))
        {
          return v;
        }
        else
        {
          return double.NaN;
        }
      }
    }
    internal string GetXmlNodeString(XmlNode node, string path)
    {
      if (node == null)
      {
        return "";
      }

      XmlNode nameNode = node.SelectSingleNode(path, NameSpaceManager);

      if (nameNode != null)
      {
        if (nameNode.NodeType == XmlNodeType.Attribute)
        {
          return nameNode.Value != null ? nameNode.Value : "";
        }
        else
        {
          return nameNode.InnerText;
        }
      }
      else
      {
        return "";
      }
    }
    internal string GetXmlNodeString(string path)
    {
            return GetXmlNodeString(TopNode, path);
    }
    internal static Uri GetNewUri(Package package, string sUri)
    {
      return GetNewUri(package, sUri, 1);
    }
    internal static Uri GetNewUri(Package package, string sUri, int id)
    {
      Uri uri;
      do
      {
        uri = new Uri(string.Format(sUri, id++), UriKind.Relative);
      }
      while (package.PartExists(uri));
      return uri;
    }
    /// <summary>
    /// Insert the new node before any of the nodes in the comma separeted list
    /// </summary>
    /// <param name="parentNode">Parent node</param>
    /// <param name="beforeNodes">comma separated list containing nodes to insert after. Left to right order</param>
    /// <param name="newNode">The new node to be inserterd</param>
    internal void InserAfter(XmlNode parentNode, string beforeNodes, XmlNode newNode)
    {
      string[] nodePaths = beforeNodes.Split(',');

      foreach (string nodePath in nodePaths)
      {
        XmlNode node = parentNode.SelectSingleNode(nodePath, NameSpaceManager);
        if (node != null)
        {
          parentNode.InsertAfter(newNode, node);
          return;
        }
      }
      parentNode.InsertAfter(newNode, null);
    }
        internal static void LoadXmlSafe(XmlDocument xmlDoc, Stream stream)
        {
            XmlReaderSettings settings = new XmlReaderSettings();
            //Disable entity parsing (to aviod xmlbombs, External Entity Attacks etc).
            settings.ProhibitDtd = true;

            XmlReader reader = XmlReader.Create(stream, settings);            
            xmlDoc.Load(reader);
        }
        internal static void LoadXmlSafe(XmlDocument xmlDoc, string xml, Encoding encoding)
        {
            var stream = new MemoryStream(encoding.GetBytes(xml));
            LoadXmlSafe(xmlDoc, stream);
        }
  }
}