How do I use Token() method in Sprache parser

Question

I'm using 'Token()' method to discard leading and trailing whitespaces but it won't, this test fails with message Expected string to be "token", but it has unexpected whitespace at the end.

I tried to call method Token() before method Text() but it won't help too. Parse.AnyChar.Many().Token().Text()

How do I use method Token() in a right way?

[Test]
public void Test()
{
  Parser<string> parser = Parse.AnyChar.Many().Text().Token();
  var actual = parser.Parse(" token ");

  actual.Should().Be("token"); // without leading and trailing whitespaces
}

score 2 · Answer 1 · answered Jan 05 '18 at 01:46

Parse.AnyChar consumes the trailing whitespace before the Token modifier comes into play.

To fix the parser, exclude the whitespace like this:

[Test]
public void Test()
{
    var parser = Parse.AnyChar.Except(Parse.WhiteSpace).Many().Text().Token();
    var actual = parser.Parse(" token ");

    actual.Should().Be("token"); // without leading and trailing whitespaces
}

How do I use Token() method in Sprache parser

1 Answers1