private ContentModel ParseContentModel(char ch)
{
var cm = new ContentModel();
switch (ch)
{
case '(':
_current.ReadChar();
ParseModel(')', cm);
ch = _current.ReadChar();
if (Occurrences.Contains(ch))
{
cm.AddOccurrence(ch);
_current.ReadChar();
}
break;
case '%': {
var e = ParseParameterEntity(Dcterm);
PushEntity(_current.ResolvedUri, e);
cm = ParseContentModel(_current.Lastchar);
PopEntity(); // bugbug should be at EOF.
}
break;
default: {
var dc = ScanName(Dcterm);
cm.SetDeclaredContent(dc);
}
break;
}
return(cm);
}
/// <summary>
/// Adds an occurrence character for this group, setting it's <see cref="Occurrence"/> value.
/// </summary>
/// <param name="c">The occurrence character.</param>
public void AddOccurrence(char c)
{
if (Occurrences.Contains(c))
{
Occurrence = Occurrences.FromChar(c);
}
Occurrence = Occurrence.Required;
}
void ParseModel(char cmt, ContentModel cm)
{
// Called when part of the model is made up of the contents of a parameter entity
var depth = cm.CurrentDepth;
var ch = _current.SkipWhitespace();
while (ch != cmt || cm.CurrentDepth > depth) // the entity must terminate while inside the content model.
{
if (ch == Entity.EOF)
{
_current.Error("Content Model was not closed");
}
switch (ch)
{
case '%':
var e = ParseParameterEntity(Cmterm);
PushEntity(_current.ResolvedUri, e);
ParseModel(Entity.EOF, cm);
PopEntity();
ch = _current.SkipWhitespace();
break;
case '(':
cm.PushGroup();
_current.ReadChar();// consume '('
ch = _current.SkipWhitespace();
break;
case ')':
ch = _current.ReadChar();// consume ')'
if (Occurrences.Contains(ch))
{
cm.AddOccurrence(ch);
_current.ReadChar();
}
if (cm.PopGroup() < depth)
{
_current.Error("Parameter entity cannot close a paren outside it's own scope");
}
ch = _current.SkipWhitespace();
break;
case '&':
case '|':
case ',':
cm.AddConnector(ch);
_current.ReadChar(); // skip connector
ch = _current.SkipWhitespace();
break;
default:
string token;
if (ch == '#')
{
_current.ReadChar();
token = "#" + _current.ScanToken(_sb, Cmterm, true); // since '#' is not a valid name character.
}
else
{
token = _current.ScanToken(_sb, Cmterm, true);
}
token = token.ToUpperInvariant();
ch = _current.Lastchar;
if (Occurrences.Contains(ch))
{
cm.PushGroup();
cm.AddSymbol(token);
cm.AddOccurrence(ch);
cm.PopGroup();
_current.ReadChar(); // skip connector
ch = _current.SkipWhitespace();
}
else
{
cm.AddSymbol(token);
ch = _current.SkipWhitespace();
}
break;
}
}
}
