public void DoesNotChangeStateAsUnderlyingEnumeratorIsTraversed()
{
var tokens = new TokenStream(Tokens());
var first = tokens;
first.Current.ShouldEqual(upper, "ABC", 1, 1);
var second = first.Advance();
first.Current.ShouldEqual(upper, "ABC", 1, 1);
second.Current.ShouldEqual(lower, "def", 1, 4);
var third = second.Advance();
first.Current.ShouldEqual(upper, "ABC", 1, 1);
second.Current.ShouldEqual(lower, "def", 1, 4);
third.Current.ShouldEqual(upper, "GHI", 1, 7);
var fourth = third.Advance();
first.Current.ShouldEqual(upper, "ABC", 1, 1);
second.Current.ShouldEqual(lower, "def", 1, 4);
third.Current.ShouldEqual(upper, "GHI", 1, 7);
fourth.Current.ShouldEqual(TokenKind.EndOfInput, "", 1, 10);
fourth.Advance().ShouldBeSameAs(fourth);
}
public void AllowsRepeatableTraversalWhileTraversingUnderlyingEnumeratorItemsAtMostOnce()
{
var tokens = new TokenStream(Tokens());
tokens.Current.ShouldEqual(upper, "ABC", 1, 1);
tokens.Advance().Current.ShouldEqual(lower, "def", 1, 4);
tokens.Advance().Advance().Current.ShouldEqual(upper, "GHI", 1, 7);
tokens.Advance().Advance().Advance().Current.ShouldEqual(TokenKind.EndOfInput, "", 1, 10);
tokens.Advance().ShouldBeSameAs(tokens.Advance());
}
public ParsedTests()
{
unparsed = new TokenStream(new CharLexer().Tokenize("0"));
}
public void ProvidesEndOfInputTokenWhenGivenEmptyEnumerator()
{
var tokens = new TokenStream(Empty());
tokens.Current.ShouldEqual(TokenKind.EndOfInput, "", 1, 1);
tokens.Advance().ShouldBeSameAs(tokens);
}
public void ProvidesEndOfInputTokenAfterEnumeratorIsExhausted()
{
var tokens = new TokenStream(OneToken());
var end = tokens.Advance();
end.Current.ShouldEqual(TokenKind.EndOfInput, "", 1, 4);
end.Advance().ShouldBeSameAs(end);
}
public void ProvidesCurrentToken()
{
var tokens = new TokenStream(Tokens());
tokens.Current.ShouldEqual(upper, "ABC", 1, 1);
}
public void AdvancesToTheNextToken()
{
var tokens = new TokenStream(Tokens());
tokens.Advance().Current.ShouldEqual(lower, "def", 1, 4);
}
public void TryingToAdvanceBeyondEndOfInputResultsInNoMovement()
{
var tokens = new TokenStream(Empty());
tokens.ShouldBeSameAs(tokens.Advance());
}
public void ProvidesPositionOfCurrentToken()
{
var tokens = new TokenStream(Tokens());
tokens.Position.Line.ShouldEqual(1);
tokens.Position.Column.ShouldEqual(1);
tokens.Advance().Position.Line.ShouldEqual(1);
tokens.Advance().Position.Column.ShouldEqual(4);
tokens.Advance().Advance().Position.Line.ShouldEqual(1);
tokens.Advance().Advance().Position.Column.ShouldEqual(7);
tokens.Advance().Advance().Advance().Position.Line.ShouldEqual(1);
tokens.Advance().Advance().Advance().Position.Column.ShouldEqual(10);
}