protected virtual Expression ReadContainerExp(ExpCombinator combinator)
{
string name = reader.Name;
if (ReadStartElement())
{
return(ReadChildExps(combinator));
}
// no children. error
ReportError(ERR_EXPRESSION_EXPECTED, name);
return(Expression.NotAllowed);
}
protected virtual Expression ReadContainerExp( ExpCombinator combinator )
{
string name = reader.Name;
if(ReadStartElement())
return ReadChildExps( combinator );
// no children. error
ReportError( ERR_EXPRESSION_EXPECTED, name );
return Expression.NotAllowed;
}
// reads child expressions and combines them by using the specified
// combinator.
protected virtual Expression ReadChildExps( ExpCombinator comb )
{
Expression exp = null;
while(SkipForeignElements()) {
Expression child=ReadExp();
if(exp==null) exp=child;
else
exp = comb( exp, child );
}
ReadEndElement();
if(exp==null) {
// error: no children
ReportError( ERR_EXPRESSION_EXPECTED );
exp = Expression.NotAllowed; // recovery.
}
return exp;
}
