private ContentModel ParseContentModel(char ch)
{
ContentModel cm = new ContentModel();
if (ch == '(')
{
this.m_current.ReadChar();
ParseModel(')', cm);
ch = this.m_current.ReadChar();
if (ch == '?' || ch == '+' || ch == '*')
{
cm.AddOccurrence(ch);
this.m_current.ReadChar();
}
}
else if (ch == '%')
{
Entity e = ParseParameterEntity(SgmlDtd.dcterm);
PushEntity(this.m_current.ResolvedUri, e);
cm = ParseContentModel(this.m_current.Lastchar);
PopEntity(); // bugbug should be at EOF.
}
else
{
string dc = ScanName(SgmlDtd.dcterm);
cm.SetDeclaredContent(dc);
}
return cm;
}
void ParseModel(char cmt, ContentModel cm)
{
// Called when part of the model is made up of the contents of a parameter entity
int depth = cm.CurrentDepth;
char ch = this.m_current.Lastchar;
ch = this.m_current.SkipWhitespace();
while (ch != cmt || cm.CurrentDepth > depth) // the entity must terminate while inside the content model.
{
if (ch == Entity.EOF)
{
this.m_current.Error("Content Model was not closed");
}
if (ch == '%')
{
Entity e = ParseParameterEntity(SgmlDtd.cmterm);
PushEntity(this.m_current.ResolvedUri, e);
ParseModel(Entity.EOF, cm);
PopEntity();
ch = this.m_current.SkipWhitespace();
}
else if (ch == '(')
{
cm.PushGroup();
this.m_current.ReadChar();// consume '('
ch = this.m_current.SkipWhitespace();
}
else if (ch == ')')
{
ch = this.m_current.ReadChar();// consume ')'
if (ch == '*' || ch == '+' || ch == '?')
{
cm.AddOccurrence(ch);
ch = this.m_current.ReadChar();
}
if (cm.PopGroup() < depth)
{
this.m_current.Error("Parameter entity cannot close a paren outside it's own scope");
}
ch = this.m_current.SkipWhitespace();
}
else if (ch == ',' || ch == '|' || ch == '&')
{
cm.AddConnector(ch);
this.m_current.ReadChar(); // skip connector
ch = this.m_current.SkipWhitespace();
}
else
{
string token;
if (ch == '#')
{
ch = this.m_current.ReadChar();
token = "#" + this.m_current.ScanToken(this.m_sb, SgmlDtd.cmterm, true); // since '#' is not a valid name character.
}
else
{
token = this.m_current.ScanToken(this.m_sb, SgmlDtd.cmterm, true);
}
token = token.ToUpperInvariant();
ch = this.m_current.Lastchar;
if (ch == '?' || ch == '+' || ch == '*')
{
cm.PushGroup();
cm.AddSymbol(token);
cm.AddOccurrence(ch);
cm.PopGroup();
this.m_current.ReadChar(); // skip connector
ch = this.m_current.SkipWhitespace();
}
else
{
cm.AddSymbol(token);
ch = this.m_current.SkipWhitespace();
}
}
}
}
/// <summary>
/// Initialises a new element declaration instance.
/// </summary>
/// <param name="name">The name of the element.</param>
/// <param name="sto">Whether the start tag is optional.</param>
/// <param name="eto">Whether the end tag is optional.</param>
/// <param name="cm">The <see cref="ContentModel"/> of the element.</param>
/// <param name="inclusions"></param>
/// <param name="exclusions"></param>
public ElementDecl(string name, bool sto, bool eto, ContentModel cm, string[] inclusions, string[] exclusions)
{
m_name = name;
m_startTagOptional = sto;
m_endTagOptional = eto;
m_contentModel = cm;
m_inclusions = inclusions;
m_exclusions = exclusions;
}