/** If you label a rule reference, you can access that rule's
* return values as well as any predefined attributes.
*/
public override Attribute GetAttribute(string name)
{
AttributeScope rulePropertiesScope =
RuleLabelScope.grammarTypeToRulePropertiesScope[(int)Grammar.type];
if (rulePropertiesScope.GetAttribute(name) != null)
{
return(rulePropertiesScope.GetAttribute(name));
}
if (referencedRule.ReturnScope != null)
{
return(referencedRule.ReturnScope.GetAttribute(name));
}
return(null);
}
/** Return the scope containing name */
public virtual AttributeScope GetAttributeScope(string name)
{
AttributeScope scope = GetLocalAttributeScope(name);
if (scope != null)
{
return(scope);
}
if (ruleScope != null && ruleScope.GetAttribute(name) != null)
{
scope = ruleScope;
}
return(scope);
}
/** Return the set of keys that collide from
* this and other.
*/
public virtual HashSet <object> Intersection(AttributeScope other)
{
if (other == null || other.Count == 0 || Count == 0)
{
return(null);
}
HashSet <object> inter = new HashSet <object>();
foreach (Attribute attr in attributes)
{
string key = attr.Name;
if (other.GetAttribute(key) != null)
{
inter.Add(key);
}
}
if (inter.Count == 0)
{
return(null);
}
return(inter);
}
/** Get the arg, return value, or predefined property for this rule */
public virtual AttributeScope GetLocalAttributeScope(string name)
{
AttributeScope scope = null;
if (ReturnScope != null && ReturnScope.GetAttribute(name) != null)
{
scope = ReturnScope;
}
else if (ParameterScope != null && ParameterScope.GetAttribute(name) != null)
{
scope = ParameterScope;
}
else
{
AttributeScope rulePropertiesScope =
RuleLabelScope.grammarTypeToRulePropertiesScope[(int)Grammar.type];
if (rulePropertiesScope.GetAttribute(name) != null)
{
scope = rulePropertiesScope;
}
}
return(scope);
}
/** Return the set of keys that collide from
* this and other.
*/
public virtual HashSet<object> Intersection( AttributeScope other )
{
if ( other == null || other.Count == 0 || Count == 0 )
{
return null;
}
HashSet<object> inter = new HashSet<object>();
foreach ( Attribute attr in _attributes )
{
string key = attr.Name;
if ( other.GetAttribute( key ) != null )
{
inter.Add( key );
}
}
if ( inter.Count == 0 )
{
return null;
}
return inter;
}
