Exemplo n.º 1
0
        public TokenStream(IEnumerable<Token> tokens)
        {
            var enumerator = tokens.GetEnumerator();

            current = enumerator.MoveNext()
                          ? enumerator.Current
                          : new Token(TokenKind.EndOfInput, new Position(1, 1), "");

            rest = new Lazy<TokenStream>(() => LazyAdvance(enumerator));
        }
Exemplo n.º 2
0
        private static double ParseAmount(Token number)
        {
            var literal = number.Literal;
            var match = TimePartRegex.Match(literal);
            if (match.Success)
            {
                var whole = Int32.Parse(match.Groups["whole"].Value);
                var fraction = Int32.Parse(match.Groups["fraction"].Value);
                return whole + (fraction / 60d);
            }

            return Double.Parse(literal, NumberStyles.Any);
        }
Exemplo n.º 3
0
        public bool TryMatch(Text text, out Token token)
        {
            var match = Match(text);

            if (match.Success)
            {
                token = new Token(this, text.Position, match.Value);
                return true;
            }

            token = null;
            return false;
        }
Exemplo n.º 4
0
        public void ImprovingDefaultMessagesWithAKnownExpectation()
        {
            var labeled = Label(AB, "'A' followed by 'B'");

            //When p succeeds after consuming input, Label(p) is the same as p.
            AB.Parses(Tokenize("AB")).WithNoMessage().WithValue(Literal("AB"));
            labeled.Parses(Tokenize("AB")).WithNoMessage().WithValue(Literal("AB"));

            //When p fails after consuming input, Label(p) is the same as p.
            AB.FailsToParse(Tokenize("A!")).LeavingUnparsedTokens("!").WithMessage("(1, 2): B expected");
            labeled.FailsToParse(Tokenize("A!")).LeavingUnparsedTokens("!").WithMessage("(1, 2): B expected");

            //When p succeeds but does not consume input, Label(p) still succeeds but the potential error is included.
            var succeedWithoutConsuming = new Token(null, null, "$").SucceedWithThisValue();
            succeedWithoutConsuming
                .PartiallyParses(Tokenize("!"))
                .LeavingUnparsedTokens("!")
                .WithNoMessage()
                .WithValue(Literal("$"));
            Label(succeedWithoutConsuming, "nothing")
                .PartiallyParses(Tokenize("!"))
                .LeavingUnparsedTokens("!")
                .WithMessage("(1, 1): nothing expected")
                .WithValue(Literal("$"));

            //When p fails but does not consume input, Label(p) fails with the given expectation.
            AB.FailsToParse(Tokenize("!")).LeavingUnparsedTokens("!").WithMessage("(1, 1): A expected");
            labeled.FailsToParse(Tokenize("!")).LeavingUnparsedTokens("!").WithMessage("(1, 1): 'A' followed by 'B' expected");
        }
Exemplo n.º 5
0
 private TokenStream(Token current)
 {
     this.current = current;
     rest = new Lazy<TokenStream>(() => this);
 }
Exemplo n.º 6
0
 private TokenStream(Token current, IEnumerator<Token> enumerator)
 {
     this.current = current;
     rest = new Lazy<TokenStream>(() => LazyAdvance(enumerator));
 }