/// <summary>
/// Determine the prefix for an element or attribute name.
/// TODO: this method probably needs some cleanup.
/// </summary>
/// <param name="uri">
/// The Namespace URI.
/// </param>
/// <param name="qName">
/// The qualified name (optional); this will be used
/// to indicate the preferred prefix if none is currently
/// bound.
/// </param>
/// <param name="isElement">
/// true if this is an element name, false
/// if it is an attribute name (which cannot use the
/// default Namespace).
/// </param>
private string DoPrefix(string uri, string qName, bool isElement)
{
string defaultNS = _nsSupport.GetUri("");
if ("".Equals(uri)) {
if (isElement && defaultNS != null) {
_nsSupport.DeclarePrefix("", "");
}
return null;
}
string prefix;
if (isElement && defaultNS != null && uri.Equals(defaultNS)) {
prefix = "";
} else {
prefix = _nsSupport.GetPrefix(uri);
}
if (prefix != null) {
return prefix;
}
bool containsPrefix = _doneDeclTable.ContainsKey(uri);
prefix = (string)(containsPrefix ? _doneDeclTable[uri] : null);
if (containsPrefix && ((!isElement || defaultNS != null) && "".Equals(prefix) || _nsSupport.GetUri(prefix) != null)) {
prefix = null;
}
if (prefix == null) {
containsPrefix = _prefixTable.ContainsKey(uri);
prefix = (string)(containsPrefix ? _prefixTable[uri] : null);
if (containsPrefix
&& ((!isElement || defaultNS != null) && "".Equals(prefix) || _nsSupport.GetUri(prefix) != null)) {
prefix = null;
}
}
if (prefix == null && qName != null && !"".Equals(qName)) {
int i = qName.IndexOf(':');
if (i == -1) {
if (isElement && defaultNS == null) {
prefix = "";
}
} else {
prefix = qName.Substring(0, i);
}
}
for (; prefix == null || _nsSupport.GetUri(prefix) != null; prefix = "__NS" + ++_prefixCounter) {
}
_nsSupport.DeclarePrefix(prefix, uri);
_doneDeclTable[uri] = prefix;
return prefix;
}
private void declarePrefix(string prefix, string uri)
{
int index = uri.IndexOf(':');
// many versions of nwalsh docbook stylesheets
// have bogus URLs; so this can't be an error...
if (index < 1 && uri.Length != 0)
{
warn("relative URI for namespace: " + uri);
}
// FIXME: char [0] must be ascii alpha; chars [1..index]
// must be ascii alphanumeric or in "+-." [RFC 2396]
uri = string.Intern(uri);
if (namespaceSupport.DeclarePrefix(prefix, uri))
{
contentHandler.StartPrefixMapping(prefix, uri);
}
}
public virtual void Attribute(string aname, string value, bool isSpecified)
{
// Code changed by MHK 16 April 2001.
// The only safe thing to do is to process all the namespace declarations
// first, then process the ordinary attributes. So if this is a namespace
// declaration, we deal with it now, otherwise we save it till we get the
// startElement call.
if (_attributeCount++ == 0)
{
if (_namespaces)
{
_prefixStack.PushContext();
}
}
// set nsTemp [0] == namespace URI (or empty)
// set nsTemp [1] == local name (or empty)
if (value == null)
{
// MHK: I think this can only happen on an error recovery path
// MHK: I was wrong: AElfred was notifying null values of attribute
// declared in the DTD as #IMPLIED. But I've now changed it so it doesn't.
return;
}
if (_namespaces && aname.StartsWith("xmlns"))
{
if (aname.Length == 5)
{
_prefixStack.DeclarePrefix("", value);
//System.err.println("Declare default prefix = "+value);
_contentHandler.StartPrefixMapping("", value);
}
else if (aname[5] == ':' && !aname.Equals("xmlns:xml"))
{
if (aname.Length == 6)
{
_errorHandler.Error(new SAXParseException("Missing namespace prefix in namespace declaration: " + aname,
this));
return;
}
string prefix = aname.Substring(6);
if (value.Length == 0)
{
_errorHandler.Error(new SAXParseException("Missing URI in namespace declaration: " + aname, this));
return;
}
_prefixStack.DeclarePrefix(prefix, value);
//System.err.println("Declare prefix " +prefix+"="+value);
_contentHandler.StartPrefixMapping(prefix, value);
}
if (!_xmlNames)
{
// if xmlNames option wasn't selected,
// we don't report xmlns:* declarations as attributes
return;
}
}
_attributeNames.Add(aname);
_attributeValues.Add(value);
}