Ejemplo n.º 1
0
        private void TryParse_Special <T>(ParseDelegate <T> parser, T positiveInfinity, T negativeInfinity, T nan)
            where T : unmanaged, IComparable <T>
        {
            ReadOnlySequence <byte> bytes  = BufferFactory.CreateUtf8("Infinity");
            BufferReader <byte>     reader = new BufferReader <byte>(bytes);

            Assert.True(parser(ref reader, out T value));
            Assert.Equal(positiveInfinity, value);
            Assert.Equal(8, reader.Consumed);

            bytes  = BufferFactory.CreateUtf8("I", "n", "finity", "-");
            reader = new BufferReader <byte>(bytes);
            Assert.True(parser(ref reader, out value));
            Assert.Equal(positiveInfinity, value);
            Assert.Equal(8, reader.Consumed);

            bytes  = BufferFactory.CreateUtf8("-Infinity");
            reader = new BufferReader <byte>(bytes);
            Assert.True(parser(ref reader, out value));
            Assert.Equal(negativeInfinity, value);
            Assert.Equal(9, reader.Consumed);

            bytes  = BufferFactory.CreateUtf8("-", "Infinit", "y");
            reader = new BufferReader <byte>(bytes);
            Assert.True(parser(ref reader, out value));
            Assert.Equal(negativeInfinity, value);
            Assert.Equal(9, reader.Consumed);

            bytes  = BufferFactory.CreateUtf8("NaN");
            reader = new BufferReader <byte>(bytes);
            Assert.True(parser(ref reader, out value));
            Assert.Equal(nan, value);
            Assert.Equal(3, reader.Consumed);
        }
Ejemplo n.º 2
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        public void Rewind_ByOne()
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 0 },
                new byte[] { 1, 2 },
                new byte[] { 3, 4 },
                new byte[] { 5, 6, 7, 8 }
            });

            BufferReader <byte> reader = new BufferReader <byte>(bytes);

            reader.Advance(1);
            BufferReader <byte> copy = reader;

            for (int i = 1; i < bytes.Length; i++)
            {
                reader.Advance(i);
                for (int j = 0; j < i; j++)
                {
                    reader.Rewind(1);
                    Assert.False(reader.End);
                }

                Assert.Equal(copy.Position, reader.Position);
                Assert.Equal(copy.Consumed, reader.Consumed);
                Assert.Equal(copy.CurrentSpanIndex, reader.CurrentSpanIndex);
                Assert.Equal(copy.End, reader.End);
                Assert.True(copy.CurrentSpan.SequenceEqual(reader.CurrentSpan));
            }
        }
Ejemplo n.º 3
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        public void IsNext_Span()
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 0 },
                new byte[] { 1, 2 },
                new byte[] { 3, 4 },
                new byte[] { 5, 6, 7, 8 }
            });

            BufferReader <byte> reader = new BufferReader <byte>(bytes);

            Assert.True(reader.IsNext(ReadOnlySpan <byte> .Empty, advancePast: false));
            Assert.True(reader.IsNext(ReadOnlySpan <byte> .Empty, advancePast: true));
            Assert.True(reader.IsNext(new byte[] { 0 }, advancePast: false));
            Assert.False(reader.IsNext(new byte[] { 0, 2 }, advancePast: false));
            Assert.False(reader.IsNext(new byte[] { 0, 2 }, advancePast: true));
            Assert.True(reader.IsNext(new byte[] { 0, 1 }, advancePast: false));
            Assert.False(reader.IsNext(new byte[] { 0, 1, 3 }, advancePast: false));
            Assert.True(reader.IsNext(new byte[] { 0, 1, 2 }, advancePast: false));
            Assert.False(reader.IsNext(new byte[] { 0, 1, 2, 4 }, advancePast: false));
            Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3 }, advancePast: false));
            Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3, 4 }, advancePast: false));
            Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3, 4, 5 }, advancePast: false));
            Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8 }, advancePast: false));
            Assert.False(reader.IsNext(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }, advancePast: false));
            Assert.False(reader.IsNext(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }, advancePast: true));
            Assert.Equal(0, reader.Consumed);

            Assert.True(reader.IsNext(new byte[] { 0, 1, 2, 3 }, advancePast: true));
            Assert.True(reader.IsNext(new byte[] { 4, 5, 6 }, advancePast: true));
            Assert.True(reader.TryPeek(out byte value));
            Assert.Equal(7, value);
        }
Ejemplo n.º 4
0
        public void TryReadToSpan_Sequence(bool advancePastDelimiter)
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 0, 0 },
                new byte[] { 1, 1, 2, 2 },
                new byte[] { },
                new byte[] { 3, 3, 4, 4, 5, 5, 6, 6 }
            });

            BufferReader <byte> reader = new BufferReader <byte>(bytes);

            for (byte i = 0; i < bytes.Length / 2 - 1; i++)
            {
                byte[] expected = new byte[i * 2 + 1];
                for (int j = 0; j < expected.Length - 1; j++)
                {
                    expected[j] = (byte)(j / 2);
                }
                expected[i * 2] = i;
                ReadOnlySpan <byte> searchFor = new byte [] { i, (byte)(i + 1) };
                BufferReader <byte> copy      = reader;
                Assert.True(copy.TryReadTo(out ReadOnlySequence <byte> seq, searchFor, advancePastDelimiter));
                Assert.True(seq.ToArray().AsSpan().SequenceEqual(expected));
            }

            bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 47, 42, 66, 32, 42, 32, 66, 42, 47 }   // /*b * b*/
            });

            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out ReadOnlySequence <byte> sequence, new byte[] { 42, 47 }, advancePastDelimiter));    //  */
            Assert.True(sequence.ToArray().AsSpan().SequenceEqual(new byte[] { 47, 42, 66, 32, 42, 32, 66 }));
        }
Ejemplo n.º 5
0
        public void MultiSegmentBytesReaderNumbers()
        {
            var bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 0 },
                new byte[] { 1, 2 },
                new byte[] { 3, 4 },
                new byte[] { 5, 6, 7, 8 },
                new byte[] { 8, 0 },
                new byte[] { 1, },
                new byte[] { 0, 2, },
                new byte[] { 1, 2, 3, 4 },
                new byte[] { 5, 6 },
                new byte[] { 7, 8, 9, },
                new byte[] { 0, 1, 2, 3 },
                new byte[] { 4, 5 },
                new byte[] { 6, 7, 8, 9 },
                new byte[] { 0, 1, 2, 3 },
                new byte[] { 4 },
            });

            var reader = new BufferReader <byte>(bytes);

            Assert.True(reader.TryReadTo(out ReadOnlySequence <byte> bytesValue, 2));
            var span = bytesValue.ToSpan();

            Assert.Equal(0, span[0]);
            Assert.Equal(1, span[1]);

            Assert.True(reader.TryReadTo(out bytesValue, 5));
            span = bytesValue.ToSpan();
            Assert.Equal(3, span[0]);
            Assert.Equal(4, span[1]);

            Assert.True(reader.TryReadTo(out bytesValue, new byte[] { 8, 8 }));
            span = bytesValue.ToSpan();
            Assert.Equal(6, span[0]);
            Assert.Equal(7, span[1]);

            Assert.True(reader.TryRead(out int intValue));
            Assert.Equal(BitConverter.ToInt32(new byte[] { 0, 1, 0, 2 }), intValue);

            Assert.True(reader.TryReadInt32BigEndian(out intValue));
            Assert.Equal(BitConverter.ToInt32(new byte[] { 4, 3, 2, 1 }), intValue);

            Assert.True(reader.TryReadInt64LittleEndian(out long longValue));
            Assert.Equal(BitConverter.ToInt64(new byte[] { 5, 6, 7, 8, 9, 0, 1, 2 }), longValue);

            Assert.True(reader.TryReadInt64BigEndian(out longValue));
            Assert.Equal(BitConverter.ToInt64(new byte[] { 0, 9, 8, 7, 6, 5, 4, 3 }), longValue);

            Assert.True(reader.TryReadInt16LittleEndian(out short shortValue));
            Assert.Equal(BitConverter.ToInt16(new byte[] { 1, 2 }), shortValue);

            Assert.True(reader.TryReadInt16BigEndian(out shortValue));
            Assert.Equal(BitConverter.ToInt16(new byte[] { 4, 3 }), shortValue);
        }
Ejemplo n.º 6
0
        private void TryParse <T>(ParseDelegate <T> parser, T expected, string formatString, char standardFormat)
            where T : unmanaged, IEquatable <T>, IFormattable, IConvertible
        {
            // Note that there is no support in Utf8Parser for localized separators
            string text = expected.ToString(formatString, CultureInfo.InvariantCulture);
            ReadOnlySequence <byte> bytes  = BufferFactory.CreateUtf8(text);
            BufferReader <byte>     reader = new BufferReader <byte>(bytes);

            Assert.True(parser(ref reader, out T value, standardFormat));
            Assert.Equal(text, value.ToString(formatString, CultureInfo.InvariantCulture));
        }
Ejemplo n.º 7
0
        public void TryReadTo_NotFound_Sequence(bool advancePastDelimiter)
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 1 },
                new byte[] { 2, 3, 255 }
            });

            BufferReader <byte> reader = new BufferReader <byte>(bytes);

            reader.Advance(4);
            Assert.False(reader.TryReadTo(out ReadOnlySequence <byte> span, 255, 0, advancePastDelimiter));
        }
Ejemplo n.º 8
0
        public void TryReadTo_Sequence(bool advancePastDelimiter, bool useEscapeOverload)
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 0 },
                new byte[] { 1, 2 },
                new byte[] { },
                new byte[] { 3, 4, 5, 6 }
            });

            BufferReader <byte> reader = new BufferReader <byte>(bytes);

            // Read to 0-5
            for (byte i = 0; i < bytes.Length - 1; i++)
            {
                BufferReader <byte> copy = reader;

                // Can read to the first integer (0-5)
                Assert.True(
                    useEscapeOverload
                        ? copy.TryReadTo(out ReadOnlySequence <byte> sequence, i, 255, advancePastDelimiter)
                        : copy.TryReadTo(out sequence, i, advancePastDelimiter));

                // Should never have a null Position object
                Assert.NotNull(copy.Position.GetObject());
                var enumerator = sequence.GetEnumerator();
                while (enumerator.MoveNext())
                {
                    ;
                }

                // Should be able to read to final 6
                Assert.True(
                    useEscapeOverload
                        ? copy.TryReadTo(out sequence, 6, 255, advancePastDelimiter)
                        : copy.TryReadTo(out sequence, 6, advancePastDelimiter));

                Assert.NotNull(copy.Position.GetObject());
                enumerator = sequence.GetEnumerator();
                while (enumerator.MoveNext())
                {
                    ;
                }

                // If we didn't advance, we should still be able to read to 6
                Assert.Equal(!advancePastDelimiter,
                             useEscapeOverload
                        ? copy.TryReadTo(out sequence, 6, 255, advancePastDelimiter)
                        : copy.TryReadTo(out sequence, 6, advancePastDelimiter));
            }
        }
Ejemplo n.º 9
0
        public void TryParseGuid_MultiSegment()
        {
            Guid expected = new Guid("9f21bcb9-f5c2-4b54-9b1c-9e0869bf9c16");
            ReadOnlySequence <byte> bytes  = BufferFactory.CreateUtf8("9f21bcb9-f5c2-4b54-9b1c-9e0869bf9c16");
            BufferReader <byte>     reader = new BufferReader <byte>(bytes);

            Assert.True(reader.TryParse(out Guid value));
            Assert.Equal(expected, value);
            Assert.Equal(36, reader.Consumed);

            // Leading zero fails
            bytes  = BufferFactory.CreateUtf8("09f21bcb9-f5c2-4b54-9b1c-9e0869bf9c16");
            reader = new BufferReader <byte>(bytes);
            Assert.False(reader.TryParse(out value));
            Assert.Equal(default, value);
        public void SequenceIndexOfMultiSegment()
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Create(
                new byte[] { 1, 2 },
                new byte[] { 3, 4 }
                );

            Assert.Equal(4, bytes.Length);

            // Static method call to avoid calling ReadOnlyBytes.IndexOf
            Assert.Equal(-1, Sequence.IndexOf(bytes, 0));

            for (int i = 0; i < bytes.Length; i++)
            {
                Assert.Equal(i, Sequence.IndexOf(bytes, (byte)(i + 1)));
            }
        }
Ejemplo n.º 11
0
        public void TryReadTo_Sequence(bool advancePastDelimiter)
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 0 },
                new byte[] { 1, 2 },
                new byte[] { },
                new byte[] { 3, 4, 5, 6 }
            });

            BufferReader <byte> reader = new BufferReader <byte>(bytes);

            for (byte i = 0; i < bytes.Length - 1; i++)
            {
                BufferReader <byte> copy = reader;
                Assert.True(copy.TryReadTo(out ReadOnlySequence <byte> span, i, 255, advancePastDelimiter));
                Assert.True(copy.TryReadTo(out span, 6, 255, advancePastDelimiter));
                Assert.Equal(!advancePastDelimiter, copy.TryReadTo(out span, 6, 255, advancePastDelimiter));
            }
        }
Ejemplo n.º 12
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        public void AdvancePastEmptySegments()
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 0 },
                new byte[] { },
                new byte[] { },
                new byte[] { }
            });

            var reader = new BufferReader <byte>(bytes);

            reader.Advance(1);
            Assert.Equal(0, reader.CurrentSpanIndex);
            Assert.Equal(0, reader.CurrentSpan.Length);
            Assert.False(reader.TryPeek(out byte value));
            ReadOnlySequence <byte> sequence = reader.Sequence.Slice(reader.Position);

            Assert.Equal(0, sequence.Length);
        }
Ejemplo n.º 13
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        public void BytesReaderParse()
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Parse("12|3Tr|ue|456Tr|ue7|89False|");
            var reader = new BufferReader <byte>(bytes);

            Assert.True(reader.TryParse(out long l64));
            Assert.Equal(123, l64);

            Assert.True(reader.TryParse(out bool b));
            Assert.Equal(true, b);

            Assert.True(reader.TryParse(out l64));
            Assert.Equal(456, l64);

            Assert.True(reader.TryParse(out b));
            Assert.Equal(true, b);

            Assert.True(reader.TryParse(out l64));
            Assert.Equal(789, l64);

            Assert.True(reader.TryParse(out b));
            Assert.Equal(false, b);
        }
Ejemplo n.º 14
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        public void BytesReaderParse()
        {
            ReadOnlySequence <byte> bytes = BufferFactory.Parse("12|3Tr|ue|456Tr|ue7|89False|");
            var reader = BufferReader.Create(bytes);

            Assert.True(BufferReaderExtensions.TryParse(ref reader, out ulong u64));
            Assert.Equal(123ul, u64);

            Assert.True(BufferReaderExtensions.TryParse(ref reader, out bool b));
            Assert.Equal(true, b);

            Assert.True(BufferReaderExtensions.TryParse(ref reader, out u64));
            Assert.Equal(456ul, u64);

            Assert.True(BufferReaderExtensions.TryParse(ref reader, out b));
            Assert.Equal(true, b);

            Assert.True(BufferReaderExtensions.TryParse(ref reader, out u64));
            Assert.Equal(789ul, u64);

            Assert.True(BufferReaderExtensions.TryParse(ref reader, out b));
            Assert.Equal(false, b);
        }
Ejemplo n.º 15
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        public void MultiSegmentBytesReaderNumbers()
        {
            var bytes = BufferFactory.Create(new byte[][] {
                new byte[] { 0 },
                new byte[] { 1, 2 },
                new byte[] { 3, 4 },
                new byte[] { 5, 6, 7, 8 },
                new byte[] { 8, 0 },
                new byte[] { 1, },
                new byte[] { 0, 2, },
                new byte[] { 1, 2, 3, 4 },
            });

            var reader = BufferReader.Create(bytes);

            Assert.True(BufferReaderExtensions.TryReadUntill(ref reader, out var bytesValue, 2));
            var span = bytesValue.ToSpan();

            Assert.Equal(0, span[0]);
            Assert.Equal(1, span[1]);

            Assert.True(BufferReaderExtensions.TryReadUntill(ref reader, out bytesValue, 5));
            span = bytesValue.ToSpan();
            Assert.Equal(3, span[0]);
            Assert.Equal(4, span[1]);

            Assert.True(BufferReaderExtensions.TryReadUntill(ref reader, out bytesValue, new byte[] { 8, 8 }));
            span = bytesValue.ToSpan();
            Assert.Equal(6, span[0]);
            Assert.Equal(7, span[1]);

            Assert.True(BufferReaderExtensions.TryRead(ref reader, out int value, true));
            Assert.Equal(BitConverter.ToInt32(new byte[] { 0, 1, 0, 2 }), value);

            Assert.True(BufferReaderExtensions.TryRead(ref reader, out value));
            Assert.Equal(BitConverter.ToInt32(new byte[] { 4, 3, 2, 1 }), value);
        }
Ejemplo n.º 16
0
        public void TryReadTo_SkipDelimiter()
        {
            byte[] expected = Encoding.UTF8.GetBytes("This is our ^|understanding^|");
            ReadOnlySequence <byte> bytes  = BufferFactory.CreateUtf8("This is our ^|understanding^|| you see.");
            BufferReader <byte>     reader = new BufferReader <byte>(bytes);

            Assert.True(reader.TryReadTo(out ReadOnlySpan <byte> span, (byte)'|', (byte)'^', advancePastDelimiter: true));
            Assert.Equal(expected, span.ToArray());
            Assert.True(reader.IsNext((byte)' '));
            Assert.Equal(30, reader.Consumed);

            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(expected, span.ToArray());
            Assert.True(reader.IsNext((byte)'|'));
            Assert.Equal(29, reader.Consumed);

            // Put the skip delimiter in another segment
            bytes  = BufferFactory.CreateUtf8("This is our ^|understanding", "^|| you see.");
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: true));
            Assert.Equal(expected, span.ToArray());
            Assert.True(reader.IsNext((byte)' '));
            Assert.Equal(30, reader.Consumed);

            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(expected, span.ToArray());
            Assert.True(reader.IsNext((byte)'|'));
            Assert.Equal(29, reader.Consumed);

            // Put the skip delimiter at the end of the segment
            bytes  = BufferFactory.CreateUtf8("This is our ^|understanding^", "|| you see.");
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: true));
            Assert.Equal(expected, span.ToArray());
            Assert.True(reader.IsNext((byte)' '));
            Assert.Equal(30, reader.Consumed);

            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(expected, span.ToArray());
            Assert.True(reader.IsNext((byte)'|'));
            Assert.Equal(29, reader.Consumed);

            // No trailing data
            bytes  = BufferFactory.CreateUtf8("This is our ^|understanding^||");
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(expected, span.ToArray());
            Assert.True(reader.IsNext((byte)'|'));
            Assert.Equal(29, reader.Consumed);

            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: true));
            Assert.Equal(expected, span.ToArray());
            Assert.True(reader.End);
            Assert.Equal(30, reader.Consumed);

            // All delimiters skipped
            bytes  = BufferFactory.CreateUtf8("This is our ^|understanding^|");
            reader = new BufferReader <byte>(bytes);
            Assert.False(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(0, reader.Consumed);

            reader = new BufferReader <byte>(bytes);
            Assert.False(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: true));
            Assert.Equal(0, reader.Consumed);

            bytes  = BufferFactory.CreateUtf8("abc^|de|");
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: true));
            Assert.Equal(Encoding.UTF8.GetBytes("abc^|de"), span.ToArray());
            Assert.True(reader.End);
            Assert.Equal(8, reader.Consumed);

            // Escape leads
            bytes  = BufferFactory.CreateUtf8("^|a|b");
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: true));
            Assert.Equal(Encoding.UTF8.GetBytes("^|a"), span.ToArray());
            Assert.True(reader.IsNext((byte)'b'));
            Assert.Equal(4, reader.Consumed);
        }
Ejemplo n.º 17
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        public void TryReadTo_SkipDelimiter_Runs()
        {
            ReadOnlySequence <byte> bytes  = BufferFactory.CreateUtf8("abc^^|def");
            BufferReader <byte>     reader = new BufferReader <byte>(bytes);

            Assert.True(reader.TryReadTo(out ReadOnlySpan <byte> span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(Encoding.UTF8.GetBytes("abc^^"), span.ToArray());
            Assert.True(reader.IsNext((byte)'|'));
            Assert.Equal(5, reader.Consumed);

            // Split after escape char
            bytes  = BufferFactory.CreateUtf8("abc^^", "|def");
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(Encoding.UTF8.GetBytes("abc^^"), span.ToArray());
            Assert.True(reader.IsNext((byte)'|'));
            Assert.Equal(5, reader.Consumed);

            // Split before and after escape char
            bytes  = BufferFactory.CreateUtf8("abc^", "^", "|def");
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(Encoding.UTF8.GetBytes("abc^^"), span.ToArray());
            Assert.True(reader.IsNext((byte)'|'));
            Assert.Equal(5, reader.Consumed);

            // Check advance past delimiter
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: true));
            Assert.Equal(Encoding.UTF8.GetBytes("abc^^"), span.ToArray());
            Assert.True(reader.IsNext((byte)'d'));
            Assert.Equal(6, reader.Consumed);

            // Leading run of 2
            bytes  = BufferFactory.CreateUtf8("^^|abc");
            reader = new BufferReader <byte>(bytes);
            Assert.True(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.Equal(Encoding.UTF8.GetBytes("^^"), span.ToArray());
            Assert.True(reader.IsNext((byte)'|'));
            Assert.Equal(2, reader.Consumed);

            // Leading run of 3
            bytes  = BufferFactory.CreateUtf8("^^^|abc");
            reader = new BufferReader <byte>(bytes);
            Assert.False(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.True(reader.IsNext((byte)'^'));
            Assert.Equal(0, reader.Consumed);

            // Trailing run of 3
            bytes  = BufferFactory.CreateUtf8("abc^^^|");
            reader = new BufferReader <byte>(bytes);
            Assert.False(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.True(reader.IsNext((byte)'a'));
            Assert.Equal(0, reader.Consumed);

            // Trailing run of 3, split
            bytes  = BufferFactory.CreateUtf8("abc^^^", "|");
            reader = new BufferReader <byte>(bytes);
            Assert.False(reader.TryReadTo(out span, (byte)'|', (byte)'^', advancePastDelimiter: false));
            Assert.True(reader.IsNext((byte)'a'));
            Assert.Equal(0, reader.Consumed);
        }