/// <summary>
/// Tests whether this element can contain another specified element.
/// </summary>
/// <param name = "name">The name of the element to check for.</param>
/// <param name = "dtd">The DTD to use to do the check.</param>
/// <returns>True if the specified element can be contained by this element.</returns>
public bool CanContain(string name, SgmlDtd dtd)
{
// return true if this element is allowed to contain the given element.
if(m_exclusions != null) {
foreach(string s in m_exclusions) {
if(string.Equals(s, name, StringComparison.OrdinalIgnoreCase)) {
return false;
}
}
}
if(m_inclusions != null) {
foreach(string s in m_inclusions) {
if(string.Equals(s, name, StringComparison.OrdinalIgnoreCase)) {
return true;
}
}
}
return m_contentModel.CanContain(name, dtd);
}
/// <summary>
/// Checks whether an element using this group can contain a specified element.
/// </summary>
/// <param name = "name">The name of the element to look for.</param>
/// <param name = "dtd">The DTD to use during the checking.</param>
/// <returns>true if an element using this group can contain the element, otherwise false.</returns>
public bool CanContain(string name, SgmlDtd dtd)
{
if(m_declaredContent != DeclaredContent.Default) {
return false; // empty or text only node.
}
return m_model.CanContain(name, dtd);
}
/// <summary>
/// Checks whether an element using this group can contain a specified element.
/// </summary>
/// <param name = "name">The name of the element to look for.</param>
/// <param name = "dtd">The DTD to use during the checking.</param>
/// <returns>true if an element using this group can contain the element, otherwise false.</returns>
/// <remarks>
/// Rough approximation - this is really assuming an "Or" group
/// </remarks>
public bool CanContain(string name, SgmlDtd dtd)
{
if(dtd == null) {
throw new ArgumentNullException("dtd");
}
// Do a simple search of members.
foreach(object obj in Members) {
if(obj is string) {
if(string.Equals((string) obj, name, StringComparison.OrdinalIgnoreCase)) {
return true;
}
}
}
// didn't find it, so do a more expensive search over child elements
// that have optional start tags and over child groups.
foreach(object obj in Members) {
var s = obj as string;
if(s != null) {
var e = dtd.FindElement(s);
if(e != null) {
if(e.StartTagOptional) {
// tricky case, the start tag is optional so element may be
// allowed inside this guy!
if(e.CanContain(name, dtd)) {
return true;
}
}
}
}
else {
var m = (Group) obj;
if(m.CanContain(name, dtd)) {
return true;
}
}
}
return false;
}
public static SgmlDtd Parse(Uri baseUri, string name, TextReader input, string subset, string proxy, XmlNameTable nt)
{
var dtd = new SgmlDtd(name, nt);
dtd.PushEntity(baseUri, new Entity(dtd.Name, baseUri, input, proxy));
if(!string.IsNullOrEmpty(subset)) {
dtd.PushEntity(baseUri, new Entity(name, subset));
}
try {
dtd.Parse();
}
catch(ApplicationException e) {
throw new SgmlParseException(e.Message + dtd.m_current.Context());
}
return dtd;
}
private void LazyLoadDtd(Uri baseUri)
{
if(this.m_dtd == null && !this.m_ignoreDtd) {
if(string.IsNullOrEmpty(this.m_syslit)) {
if(this.m_docType != null && StringUtilities.EqualsIgnoreCase(this.m_docType, "html")) {
var a = typeof(SgmlReader).Assembly;
var name = a.FullName.Split(',')[0] + ".Html.dtd";
var stm = a.GetManifestResourceStream(name);
if(stm != null) {
var sr = new StreamReader(stm);
this.m_dtd = SgmlDtd.Parse(baseUri, "HTML", sr, null, this.m_proxy, null);
}
}
}
else {
if(baseUri != null) {
baseUri = new Uri(baseUri, this.m_syslit);
}
else if(this.m_baseUri != null) {
baseUri = new Uri(this.m_baseUri, this.m_syslit);
}
else {
baseUri = new Uri(new Uri(Directory.GetCurrentDirectory() + "\\"), this.m_syslit);
}
this.m_dtd = SgmlDtd.Parse(baseUri, this.m_docType, this.m_pubid, baseUri.AbsoluteUri, this.m_subset, this.m_proxy, null);
}
}
if(this.m_dtd != null && this.m_dtd.Name != null) {
switch(this.CaseFolding) {
case CaseFolding.ToUpper:
this.m_rootElementName = this.m_dtd.Name.ToUpperInvariant();
break;
case CaseFolding.ToLower:
this.m_rootElementName = this.m_dtd.Name.ToLowerInvariant();
break;
default:
this.m_rootElementName = this.m_dtd.Name;
break;
}
this.m_isHtml = StringUtilities.EqualsIgnoreCase(this.m_dtd.Name, "html");
}
}
