public void TestConsumeTab()
{
var stream = new TabAwareCharacterStream("a\tb");
stream.CurrentChar.Should().Be('a');
stream.MoveToNextChar();
stream.TryConsumeWhiteSpace(4).Should().BeTrue();
stream.CurrentChar.Should().Be('b');
stream.TryConsumeWhiteSpace(1).Should().BeFalse();
}
public void TestConsumePartialTab()
{
var stream = new TabAwareCharacterStream("a\tb");
stream.CurrentChar.Should().Be('a');
stream.MoveToNextChar();
stream.TryConsumeWhiteSpace(2).Should().BeTrue();
stream.CurrentChar.Should().Be('b', "stream should be at next character after consuming partial tab");
stream.TryConsumeWhiteSpace(2).Should().BeTrue();
stream.CurrentChar.Should().Be('b');
stream.TryConsumeWhiteSpace(1).Should().BeFalse();
}
public void TestConsumeTooMuch()
{
var stream = new TabAwareCharacterStream("a\tb");
stream.MoveToNextChar();
stream.TryConsumeWhiteSpace(2).Should().BeTrue();
stream.TryConsumeWhiteSpace(3).Should().BeFalse();
stream.CurrentChar.Should().Be('b');
stream.TryConsumeWhiteSpace(2).Should().BeTrue("consuming too much space should have no effect");
stream.CurrentChar.Should().Be('b');
stream.TryConsumeWhiteSpace(1).Should().BeFalse();
}
public void TestPeekPartialTab()
{
var stream = new TabAwareCharacterStream("a\tb");
stream.MoveToNextChar();
stream.TryConsumeWhiteSpace(2).Should().BeTrue();
using (stream.Peek())
stream.TryConsumeWhiteSpace(2).Should().BeTrue();
stream.TryConsumeWhiteSpace(2).Should().BeTrue("resetting peek should preserve partial tabs");
stream.CurrentChar.Should().Be('b');
stream.TryConsumeWhiteSpace(1).Should().BeFalse();
}
public void TestConsumeMixedWhitespace()
{
var stream = new TabAwareCharacterStream("a \t \t\t \tb");
stream.MoveToNextChar();
// Stream is at first space
stream.TryConsumeWhiteSpace(99).Should().BeFalse();
stream.TryConsumeWhiteSpace(2).Should().BeTrue();
// Stream is at center of first tab
stream.TryConsumeWhiteSpace(99).Should().BeFalse();
stream.TryConsumeWhiteSpace(4).Should().BeTrue();
// Stream is at second tab
stream.TryConsumeWhiteSpace(99).Should().BeFalse();
stream.TryConsumeWhiteSpace(5).Should().BeTrue();
// Stream is at first space in third tab
stream.TryConsumeWhiteSpace(99).Should().BeFalse();
stream.TryConsumeWhiteSpace(9).Should().BeTrue();
stream.CurrentChar.Should().Be('b');
}