private static void TryParseRangeAppend(ref ParserState state, ref RangeSyntaxNode range)
{
var snapshot = (state, range);
var gotSeparator = state.TryConsume(t => t.IsRangeSeparator);
if (state.TryConsume(t => t.IsRangeComponent))
{
var tokens = state.TakeBuffer();
range = new RangeSyntaxNode(
tokens.AddRange(range.Components),
range.Fraction,
tokens.AddRange(range.Tokens));
if (range.ToString().Length <= 8)
{
TryParseRangeAppend(ref state, ref range);
return;
}
}
(state, range) = snapshot;
}
// TODO: Discarded leading tokens
// TODO: Multiple lines
// TODO: Attention lines
// TODO: General Delivery
// TODO: USPS addresses
// TODO: Military addresses
// TODO: Puerto Rico addresses
// TODO: US Virgin Islands addresses
#region public APIs
public static bool TryParseRange(string input, out RangeSyntaxNode result)
{
var tokens = Tokenizer.Tokenize(input).Reverse().ToImmutableArray();
var state = new ParserState(tokens);
var success = TryParseRange(ref state, out var syntax) && state.Current.IsNone;
result = success ? syntax : null;
return(success);
}
private static bool TryParseRange(ref ParserState state, out RangeSyntaxNode result)
{
result = null;
var snapshot = state;
state.ConsumeWhiteSpace();
var fraction = Token.None;
if (state.TryConsume(t => t.Kind == TokenKind.Fraction))
{
fraction = state.Buffer.Last();
state.ConsumeWhiteSpace();
}
if (state.TryConsume(t => t.IsRangeComponent))
{
var tokens = state.TakeBuffer();
result = new RangeSyntaxNode(
tokens.Take(1).ToImmutableArray(),
fraction,
tokens);
TryParseRangeAppend(ref state, ref result);
if (result != null)
{
state.TakeBuffer();
return(true);
}
}
state = snapshot;
return(false);
}