public void Peek_Test()
{
var target = new StringCharacterSequence("abc");
target.Peek().Should().Be('a');
target.Peek().Should().Be('a');
target.Peek().Should().Be('a');
}
public void Peek_OldMacNewlines()
{
var target = new StringCharacterSequence("\ra\r");
target.Peek().Should().Be('\n');
target.GetNext();
target.Peek().Should().Be('a');
target.GetNext();
target.Peek().Should().Be('\n');
target.GetNext();
target.Peek().Should().Be('\0');
}
public void Peek_WindowsNewlines()
{
var target = new StringCharacterSequence("\r\na\r\n");
target.Peek().Should().Be('\n');
target.GetNext();
target.Peek().Should().Be('a');
target.GetNext();
target.Peek().Should().Be('\n');
target.GetNext();
target.Peek().Should().Be('\0');
}
public void Parse_Success_ThenFail()
{
var parser = If(_successParser, _failParser, Produce(() => true));
var input = new StringCharacterSequence("abc");
var result = parser.Parse(input);
result.Success.Should().BeFalse();
input.Peek().Should().Be('a');
}
public void FollowedBy_Success()
{
var parser = Match('[').FollowedBy(Match('~'));
var input = new StringCharacterSequence("[~test]");
var result = parser.Parse(input);
result.Value.Should().Be('[');
result.Consumed.Should().Be(1);
input.Peek().Should().Be('~');
}
public void FollowedBy_Fail()
{
var parser = Match('[').FollowedBy(Match('~'));
var input = new StringCharacterSequence("[test]");
var result = parser.Parse(input);
result.Success.Should().BeFalse();
result.Consumed.Should().Be(0);
input.Peek().Should().Be('[');
}
public void Parse_Fail()
{
var target = And(Any(), Fail <char>()).None();
var input = new StringCharacterSequence("abc");
var result = target.Parse(input);
result.Success.Should().BeFalse();
result.Consumed.Should().Be(0);
input.Peek().Should().Be('a');
}
public void Parse_Output_Test()
{
var target = Any().None();
var input = new StringCharacterSequence("abc");
var result = target.Parse(input);
result.Success.Should().BeTrue();
result.Value.Should().Be('a');
result.Consumed.Should().Be(0);
input.Peek().Should().Be('a');
}
public void RewindInput_Test()
{
var parser = Rule(
Match('a'),
Match('b'),
Match('c'),
(a, b, c) => "ok"
);
var input = new StringCharacterSequence("abd");
var result = parser.Parse(input);
result.Success.Should().BeFalse();
input.Peek().Should().Be('a');
}
public void Indexer_Test()
{
var sequence = new StringCharacterSequence("abcdefg");
var buffer = sequence.CreateBuffer();
buffer[0].Should().Be('a');
buffer[1].Should().Be('b');
buffer[2].Should().Be('c');
buffer[3].Should().Be('d');
buffer[4].Should().Be('e');
var result = buffer.Capture(3);
var str = new string(result);
str.Should().Be("abc");
sequence.Peek().Should().Be('d');
}
public void Parse_Fail_Rewind()
{
var parser = Sequential(s =>
{
var first = s.Parse(Any());
var second = s.Parse(Any());
var third = s.Parse(Any());
var fail = s.Parse(Fail <char>());
return($"{first}{second}{third}".ToUpper());
});
var input = new StringCharacterSequence("abc");
var result = parser.Parse("abc");
result.Success.Should().BeFalse();
input.Peek().Should().Be('a');
}
public void ZeroOrMore_MissingRight_Recursed_Rewind()
{
// We match <first> and <middle>, recurse on <right>, but the recursed rule
// fails on <recursed.Right>. Rewind back to a success and leave the
// unmatched second <middle> on the input sequence
var numberParser = Match(char.IsNumber).Transform(c => c.ToString());
var letterParser = Match(char.IsLetter).Transform(c => c.ToString());
var parser = RightApply(
numberParser,
letterParser,
(l, m, r) => $"({l}{m}{r})"
);
var input = new StringCharacterSequence("1a2b");
var result = parser.Parse(input);
result.Value.Should().Be("(1a2)");
input.Peek().Should().Be('b');
result.Consumed.Should().Be(3);
}
public void ZeroOrMore_MissingRight_Rewind()
{
// If we match <first> and <middle> but fail to parse <right> and there is
// no synthetic option specified, we should rewind <middle> and only return
// <first>
var numberParser = Match(char.IsNumber).Transform(c => c.ToString());
var letterParser = Match(char.IsLetter).Transform(c => c.ToString());
var parser = RightApply(
numberParser,
letterParser,
(l, m, r) => $"({l}{m}{r})"
);
var input = new StringCharacterSequence("1a");
var result = parser.Parse(input);
result.Value.Should().Be("1");
input.Peek().Should().Be('a');
result.Consumed.Should().Be(1);
}
public void Peek_End()
{
var target = new StringCharacterSequence("");
target.Peek().Should().Be('\0');
}