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;
}
internal override bool Parse(ParseContext context, ParseRule rule, out Token result)
{
OrderedChoiceMemento state;
if (context.Recovering)
state = (OrderedChoiceMemento)context.Recover();
else
state = new OrderedChoiceMemento(context);
context.BeginExpression(state);
// Parse each subexpression until the first match
for (; state.index < ExpressionCount; ++state.index) {
var expr = Expression(state.index);
Token t;
// Parsing succeeded on a subexpression - return the result
if (expr.Parse(context, rule, out t)) {
context.EndExpression();
result = t;
return true;
}
context.Offset = state.offset;
}
context.EndExpression();
return context.Reject(rule, this, out result);
}