// Author: Dwivedi, Ajay kumar
// Adwiv@Yahoo.com
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Xml.Serialization;
using System.ComponentModel;
using System.Xml;
using Mono.Xml;
using Mono.Xml.Schema;
namespace System.Xml.Schema{
/// <summary>
/// Summary description for XmlSchemaXPath.
/// </summary>
public class XmlSchemaXPath : XmlSchemaAnnotated
{
private string xpath;
XmlNamespaceManager nsmgr;
internal bool isSelector;
XsdIdentityPath [] compiledExpression;
XsdIdentityPath currentPath;
public XmlSchemaXPath()
{
}
[DefaultValue("")]
[System.Xml.Serialization.XmlAttribute("xpath")]
public string XPath
{
get{ return xpath; }
set{ xpath = value; }
}
internal override int Compile(ValidationEventHandler h, XmlSchema schema)
{
// If this is already compiled this time, simply skip.
if (CompilationId == schema.CompilationId)
return 0;
if (nsmgr == null) {
nsmgr = new XmlNamespaceManager (new NameTable ());
if (Namespaces != null)
foreach (XmlQualifiedName qname in Namespaces.ToArray ())
nsmgr.AddNamespace (qname.Name, qname.Namespace);
}
currentPath = new XsdIdentityPath ();
ParseExpression (xpath, h, schema);
XmlSchemaUtil.CompileID(Id, this, schema.IDCollection, h);
this.CompilationId = schema.CompilationId;
return errorCount;
}
internal XsdIdentityPath [] CompiledExpression {
get { return compiledExpression; }
}
private void ParseExpression (string xpath, ValidationEventHandler h, XmlSchema schema)
{
ArrayList paths = new ArrayList ();
ParsePath (xpath, 0, paths, h, schema);
this.compiledExpression = (XsdIdentityPath []) paths.ToArray (typeof (XsdIdentityPath));
}
private void ParsePath (string xpath, int pos, ArrayList paths,
ValidationEventHandler h, XmlSchema schema)
{
pos = SkipWhitespace (xpath, pos);
if (xpath.Length >= pos + 3 && xpath [pos] == '.') {
int tmp = pos;
pos++;
pos = SkipWhitespace (xpath, pos);
if (xpath.Length > pos + 2 && xpath.IndexOf ("//", pos, 2) == pos) {
currentPath.Descendants = true;
pos += 2;
}
else
pos = tmp; // revert
}
ArrayList al = new ArrayList ();
ParseStep (xpath, pos, al, paths, h, schema);
}
private void ParseStep (string xpath, int pos, ArrayList steps,
ArrayList paths, ValidationEventHandler h, XmlSchema schema)
{
pos = SkipWhitespace (xpath, pos);
if (xpath.Length == pos) {
error (h, "Empty xpath expression is specified");
return;
}
XsdIdentityStep step = new XsdIdentityStep ();
switch (xpath [pos]) {
case '@':
if (isSelector) {
error (h, "Selector cannot include attribute axes.");
currentPath = null;
return;
}
pos++;
step.IsAttribute = true;
pos = SkipWhitespace (xpath, pos);
if (xpath.Length > pos && xpath [pos] == '*') {
pos++;
step.IsAnyName = true;
break;
}
goto default;
case '.':
pos++; // do nothing ;-)
step.IsCurrent = true;
break;
case '*':
pos++;
step.IsAnyName = true;
break;
case 'c':
if (xpath.Length > pos + 5 && xpath.IndexOf ("child", pos, 5) == pos) {
int tmp = pos;
pos += 5;
pos = SkipWhitespace (xpath, pos);
if (xpath.Length > pos && xpath [pos] == ':' && xpath [pos+1] == ':') {
pos += 2;
if (xpath.Length > pos && xpath [pos] == '*') {
pos++;
step.IsAnyName = true;
break;
}
pos = SkipWhitespace (xpath, pos);
}
else
pos = tmp;
}
goto default;
case 'a':
if (xpath.Length > pos + 9 && xpath.IndexOf ("attribute", pos, 9) == pos) {
int tmp = pos;
pos += 9;
pos = SkipWhitespace (xpath, pos);
if (xpath.Length > pos && xpath [pos] == ':' && xpath [pos+1] == ':') {
if (isSelector) {
error (h, "Selector cannot include attribute axes.");
currentPath = null;
return;
}
pos += 2;
step.IsAttribute = true;
if (xpath.Length > pos && xpath [pos] == '*') {
pos++;
step.IsAnyName = true;
break;
}
pos = SkipWhitespace (xpath, pos);
}
else
pos = tmp;
}
goto default;
default:
int nameStart = pos;
while (xpath.Length > pos) {
if (!XmlChar.IsNCNameChar (xpath [pos]))
break;
else
pos++;
}
if (pos == nameStart) {
error (h, "Invalid path format for a field.");
this.currentPath = null;
return;
}
if (xpath.Length == pos || xpath [pos] != ':')
step.Name = xpath.Substring (nameStart, pos - nameStart);
else {
string prefix = xpath.Substring (nameStart, pos - nameStart);
pos++;
if (xpath.Length > pos && xpath [pos] == '*') {
string ns = nsmgr.LookupNamespace (prefix, false);
if (ns == null) {
error (h, "Specified prefix '" + prefix + "' is not declared.");
this.currentPath = null;
return;
}
step.NsName = ns;
pos++;
} else {
int localNameStart = pos;
while (xpath.Length > pos) {
if (!XmlChar.IsNCNameChar (xpath [pos]))
break;
else
pos++;
}
step.Name = xpath.Substring (localNameStart, pos - localNameStart);
string ns = nsmgr.LookupNamespace (prefix, false);
if (ns == null) {
error (h, "Specified prefix '" + prefix + "' is not declared.");
this.currentPath = null;
return;
}
step.Namespace = ns;
}
}
break;
}
if (!step.IsCurrent) // Current step is meaningless, other than its representation.
steps.Add (step);
pos = SkipWhitespace (xpath, pos);
if (xpath.Length == pos) {
currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));
paths.Add (currentPath);
return;
}
else if (xpath [pos] == '/') {
pos++;
if (step.IsAttribute) {
error (h, "Unexpected xpath token after Attribute NameTest.");
this.currentPath = null;
return;
}
this.ParseStep (xpath, pos, steps, paths, h, schema);
if (currentPath == null) // For ValidationEventHandler
return;
currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));
} else if (xpath [pos] == '|') {
pos++;
currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));
paths.Add (this.currentPath);
this.currentPath = new XsdIdentityPath ();
this.ParsePath (xpath, pos, paths, h, schema);
} else {
error (h, "Unexpected xpath token after NameTest.");
this.currentPath = null;
return;
}
}
private int SkipWhitespace (string xpath, int pos)
{
bool loop = true;
while (loop && xpath.Length > pos) {
switch (xpath [pos]) {
case ' ':
case '\t':
case '\r':
case '\n':
pos++;
continue;
default:
loop = false;
break;
}
}
return pos;
}
//<selector
// id = ID
// xpath = a subset of XPath expression, see below
// {any attributes with non-schema namespace . . .}>
// Content: (annotation?)
//</selector>
internal static XmlSchemaXPath Read(XmlSchemaReader reader, ValidationEventHandler h,string name)
{
XmlSchemaXPath path = new XmlSchemaXPath();
reader.MoveToElement();
if(reader.NamespaceURI != XmlSchema.Namespace || reader.LocalName != name)
{
error(h,"Should not happen :1: XmlSchemaComplexContentRestriction.Read, name="+reader.Name,null);
reader.Skip();
return null;
}
path.LineNumber = reader.LineNumber;
path.LinePosition = reader.LinePosition;
path.SourceUri = reader.BaseURI;
XmlNamespaceManager currentMgr = XmlSchemaUtil.GetParserContext (reader.Reader).NamespaceManager;
if (currentMgr != null) {
path.nsmgr = new XmlNamespaceManager (reader.NameTable);
IEnumerator e = currentMgr.GetEnumerator ();
while (e.MoveNext ()) {
string prefix = e.Current as string;
switch (prefix) {
case "xml":
case "xmlns":
continue;
default:
path.nsmgr.AddNamespace (prefix, currentMgr.LookupNamespace (prefix, false));
break;
}
}
}
while(reader.MoveToNextAttribute())
{
if(reader.Name == "id")
{
path.Id = reader.Value;
}
else if(reader.Name == "xpath")
{
path.xpath = reader.Value;
}
else if((reader.NamespaceURI == "" && reader.Name != "xmlns") || reader.NamespaceURI == XmlSchema.Namespace)
{
error(h,reader.Name + " is not a valid attribute for "+name,null);
}
else
{
XmlSchemaUtil.ReadUnhandledAttribute(reader,path);
}
}
reader.MoveToElement();
if(reader.IsEmptyElement)
return path;
// Content: (annotation?)
int level = 1;
while(reader.ReadNextElement())
{
if(reader.NodeType == XmlNodeType.EndElement)
{
if(reader.LocalName != name)
error(h,"Should not happen :2: XmlSchemaXPath.Read, name="+reader.Name,null);
break;
}
if(level <= 1 && reader.LocalName == "annotation")
{
level = 2; //Only one annotation
XmlSchemaAnnotation annotation = XmlSchemaAnnotation.Read(reader,h);
if(annotation != null)
path.Annotation = annotation;
continue;
}
reader.RaiseInvalidElementError();
}
return path;
}
}
}
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