internal override bool Parse(ParseContext context, ParseRule rule, out Token result)
{
SequenceMemento state;
if (context.Recovering)
state = (SequenceMemento)context.Recover();
else
state = new SequenceMemento(context);
context.BeginExpression(state);
// Parse each subexpression to find nested tokens
for (; state.Index < ExpressionCount; ++state.Index) {
var expr = Expression(state.Index);
Token t;
// Parsing failed on a subexpression - return an overall failure
if (!expr.Parse(context, rule, out t)) {
context.Offset = state.Offset;
context.EndExpression();
result = t;
return false;
}
// Skip blank tokens
if (t.Blank)
continue;
// Add the parsed token to our result
state.Result.Add(t);
}
if (state.Result.HasChildren)
state.Result.EndOffset = context.Offset;
context.EndExpression();
result = state.Result;
return true;
}
SequenceMemento(SequenceMemento m)
{
this.Result = m.Result;
this.Index = m.Index;
this.Offset = m.Offset;
}
