public override ParseTree Parse(Lexer lexer, ParserState state)
{
int start = lexer.Position;
if (type == null)
{
throw new Exception();
}
if (state.RuntimeState.Runtime.TraceParser)
{
state.RuntimeState.Runtime.ParseTrace.Enter(this,
lexer.CurrentSource(),
"User defined node " + TypeNames.GetName(type));
}
object instance = NewNode.New(state.RuntimeState, type, null);
object parseMethod = MemberNode.GetMember(instance, "Parse", true);
object result = CallNode.Call(state.RuntimeState, parseMethod,
new object[] { lexer });
if (result == null)
{
result = ParseTree.Yes;
}
else if (result is bool)
{
if ((bool)result)
{
result = ParseTree.Yes;
}
else
{
result = ParseTree.No;
}
}
if (state.RuntimeState.Runtime.TraceParser)
{
if (result == ParseTree.No)
{
state.RuntimeState.Runtime.ParseTrace.No(this,
lexer.SourceFrom(start));
}
else
{
state.RuntimeState.Runtime.ParseTrace.Yes(this,
lexer.SourceFrom(start));
}
}
return((ParseTree)result);
}
public ParseTree Instantiate(Lexer lexer, ParserState state,
int start, ParseTree tree)
{
Type[] parameterTypes = new Type[1 + Fields.Count];
parameterTypes[0] = typeof(Source);
for (int n = 1; n < parameterTypes.Length; n++)
{
parameterTypes[n] = typeof(object);
}
ConstructorInfo constructor = Type.GetConstructor(parameterTypes);
if (constructor == null)
{
throw new Exception("Couldn't find constructor for "
+ Type.FullName);
}
object[] parameterValues = new object[parameterTypes.Length];
parameterValues[0] = lexer.SourceFrom(start);
for (int n = 0; n < Fields.Count; n++)
{
object fieldValue = null;
tree.Fields.TryGetValue(Fields[n], out fieldValue);
parameterValues[n + 1] = fieldValue;
}
RuntimeObject instance =
(RuntimeObject)constructor.Invoke(parameterValues);
object[] parsedParameters = {};
object parsedMethod = MemberNode.GetMember(instance, "Parsed",
parsedParameters, false);
if (parsedMethod != null)
{
CallNode.Call(state.RuntimeState, parsedMethod,
parsedParameters);
}
return(new ParseTree(instance));
}