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// NAnt - A .NET build tool
// Copyright (C) 2001 Gerry Shaw
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Gerry Shaw (gerry_shaw@yahoo.com)
namespace SourceForge.NAnt {
using System;
using System.IO;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.XPath;
using System.Collections;
public struct TextPosition {
public static readonly TextPosition InvalidPosition = new TextPosition(-1,-1);
public TextPosition(int line, int column) {
Line = line;
Column = column;
}
public int Line;
public int Column;
}
/// <summary>
/// Maps XML nodes to the text positions from their original source.
/// </summary>
public class XPathTextPositionMap {
Hashtable _map = new Hashtable();
public XPathTextPositionMap(string url) {
string parentXPath = "/"; // default to root
string previousXPath = "";
int previousDepth = 0;
// Load text reader
XmlTextReader reader = new XmlTextReader(url);
ArrayList indexAtDepth = new ArrayList();
// Explicitly load document XPath
_map.Add((object) "/", (object) new TextPosition(1, 1));
// loop thru all nodes in the document
while (reader.Read()) {
// reader to Node ...
if ( (reader.NodeType.ToString() != "Whitespace") // Ignore those we aren't interested in
&& (reader.NodeType.ToString() != "EndElement")
&& (reader.NodeType.ToString() != "ProcessingInstruction")
&& (reader.NodeType.ToString() != "XmlDeclaration")
) {
int level = reader.Depth;
string currentXPath = "";
// If we arr higher than before
if (reader.Depth < previousDepth) {
// Clear vars for new depth
string[] list = parentXPath.Split('/');
string newXPath = ""; // once appended to / will be root node ...
for (int j = 1; j < level+1; j++) {
newXPath += "/" + list[j];
}
// higher than before so trim xpath\
parentXPath = newXPath; // one up from before
// clear indexes for depth greater than ours
indexAtDepth.RemoveRange(level+1, indexAtDepth.Count - (level+1));
} else if (reader.Depth > previousDepth) {
// we are lower
parentXPath = previousXPath;
}
// End depth setup
// Setup up index array
// add any needed extra items ( usually only 1 )
// would have uses array but not sure what maximum depth will be beforehand
for (int index = indexAtDepth.Count; index < level+1; index++) {
indexAtDepth.Add(0);
}
// Set child index
if ((int) indexAtDepth[level] == 0) {
// first time thru
indexAtDepth[level] = 1;
} else {
indexAtDepth[level] = (int) indexAtDepth[level] + 1; // lower so append to xpath
}
// Do actual XPath generation
if (parentXPath.EndsWith("/")) {
currentXPath = parentXPath;
} else {
currentXPath = parentXPath + "/"; // add seperator
}
// Set the final XPath
currentXPath += "child::node()[" + indexAtDepth[level] + "]";
// Add to our hash structures
_map.Add((object) currentXPath, (object) new TextPosition(reader.LineNumber, reader.LinePosition));
// setup up loop vars for next iteration
previousXPath = currentXPath;
previousDepth = reader.Depth;
}
}
}
public TextPosition GetTextPosition(XmlNode node) {
string xpath = GetXPathFromNode(node);
return GetTextPosition(xpath);
}
public TextPosition GetTextPosition(string xpath) {
TextPosition pos;
if (_map.ContainsKey(xpath)) {
pos = (TextPosition) _map[xpath];
} else {
pos = TextPosition.InvalidPosition;
}
return pos;
}
private string GetXPathFromNode(XmlNode node) {
XPathNavigator nav = node.CreateNavigator();
string xpath = "";
int index = 0;
while (nav.NodeType.ToString() != "Root") {
// loop thru children until we find ourselves
XPathNavigator navParent = nav.Clone();
navParent.MoveToParent();
int parentIndex = 0;
navParent.MoveToFirstChild();
if (navParent.IsSamePosition(nav)) {
index = parentIndex;
}
while (navParent.MoveToNext()) {
parentIndex++;
if (navParent.IsSamePosition(nav)) {
index = parentIndex;
}
}
nav.MoveToParent(); // do loop condiditon here
// if we are at doc and index = 0 then there is no xml proc instruction
if ((nav.NodeType.ToString()) != "Root" || (index == 0)) {
index = index + 1; // special case at root to avoid processing instruction ..
}
string thisNode = "child::node()[" + index + "]";
if (xpath == "") {
xpath = thisNode;
} else {
// build xpath string
xpath = thisNode + "/" + xpath;
}
}
// prepend slash to ...
xpath = "/" + xpath;
return xpath;
}
}
}
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