// gets or creates a ReferenceExp which has the specified name.
public ReferenceExp GetOrCreate( string name )
{
ReferenceExp exp = (ReferenceExp)namedPatterns[name];
if(exp==null)
namedPatterns[name] = exp = new ReferenceExp(name);
return exp;
}
// gets or creates a ReferenceExp which has the specified name.
public ReferenceExp GetOrCreate(string name)
{
ReferenceExp exp = (ReferenceExp)namedPatterns[name];
if (exp == null)
{
namedPatterns[name] = exp = new ReferenceExp(name);
}
return(exp);
}
public void OnRef(ReferenceExp exp)
{
if (recurseRefExp)
{
exp.exp.Visit(this);
}
else
{
writer.Write("{%");
writer.Write(exp.name);
writer.Write("}");
}
}
protected void MemorizeReference( ReferenceExp exp )
{
RefParseInfo pi = (RefParseInfo)refParseInfos[exp];
if(pi==null)
refParseInfos[exp] = pi = new RefParseInfo();
pi.MemorizeReference(reader);
}
protected virtual void CombineReferenceExp(
ReferenceExp r, Expression body, string combine )
{
if( redefiningRefExps.ContainsKey(r) ) {
// this pattern is currently being redefined.
redefiningRefExps[r] = true;
return; // ignore the value
}
RefParseInfo pi = (RefParseInfo)refParseInfos[r];
if(pi==null) refParseInfos[r] = pi = new RefParseInfo();
if( pi.Combine!=null && combine!=null && pi.Combine!=combine ) {
// error: inconsistent combine method
ReportError( ERR_INCONSISTENT_COMBINE, r.name );
pi.Combine = null;
return;
}
if( combine==null ) {
if( pi.HeadDefined )
// error: multiple heads
ReportError( ERR_MULTIPLE_HEADS, r.name );
pi.HeadDefined = true;
combine = pi.Combine;
} else {
pi.Combine = combine;
}
if( r.exp==null )
r.exp = body;
else {
if(combine=="interleave") r.exp = Builder.CreateInterleave( r.exp, body );
else
if(combine=="choice") r.exp = Builder.CreateChoice( r.exp, body );
else {
// error: invalid combine value
ReportError( ERR_INVALID_COMBINE, combine );
}
}
}
public Expression OnRef( ReferenceExp exp )
{
return exp.exp.Visit(this);
}
public void OnRef( ReferenceExp exp )
{
if(recurseRefExp) {
exp.exp.Visit(this);
} else {
writer.Write("{%");
writer.Write(exp.name);
writer.Write("}");
}
}