public void FinishedShouldBeTrueWhenNoDataRemains()
{
//Arrange
var keeper = new StringKeeper("test");
keeper.Take(); //t
keeper.Take(); //e
keeper.Take(); //s
keeper.Take(); //t
//Act/Assert
keeper.Finished.Should().BeTrue();
}
public void TakeReturnsNulWhenNoDataRemains()
{
//Arrange
var keeper = new StringKeeper("test");
keeper.Take(); //t
keeper.Take(); //e
keeper.Take(); //s
keeper.Take(); //t
//Act
var result = keeper.Take();
//Assert
result.Should().Be("\0");
}
public static IEnumerable <ApplyIfToken> Analyse(string source)
{
var stringKeeper = new StringKeeper(source);
while (!stringKeeper.IsEmpty)
{
if (stringKeeper.IsWhitespace)
{
stringKeeper = stringKeeper.Take();
continue;
}
StringKeeper newStringKeeper;
ApplyIfToken token;
if (TryTake(stringKeeper, Tokens, out newStringKeeper, out token) ||
TryTakeIdentifier(stringKeeper, out newStringKeeper, out token))
{
stringKeeper = newStringKeeper;
yield return(token);
}
else
{
var finish = new StringKeeper(stringKeeper);
while (!finish.IsEmpty)
{
finish = finish.Take();
}
yield return(new ApplyIfToken(ApplyIfTokenType.Error, finish.Difference(stringKeeper)));
stringKeeper = finish;
}
}
}
public void TakeMovesThePositionAlong()
{
//Arrange
var keeper = new StringKeeper("test");
//Act
keeper.Take();
//Assert
keeper.Next.Should().Be('e');
}
public void TakeReturnsTheNextCharacter()
{
//Arrange
var keeper = new StringKeeper("test");
//Act
var result = keeper.Take();
//Assert
result.Should().Be("t");
}
public void CopiedInstancesShouldHaveTheSamePositionAsTheOriginal()
{
//Arrange
var keeper = new StringKeeper("test");
keeper.Take();
//Act
var keeper2 = new StringKeeper(keeper);
//Assert
keeper2.TakeAll().Should().Be(keeper.TakeAll());
}
public void WhitespaceSkippedDoesNotHaveToBeAtTheStart()
{
//Arrange
var keeper = new StringKeeper("X \t\n\r\ftest");
keeper.Take();
//Act
keeper.SkipWhiteSpace();
//Assert
keeper.Next.Should().Be('t');
}
public void TakeAllReturnsRemainingText()
{
//Arrange
var keeper = new StringKeeper("test");
keeper.Take();
//Act
var result = keeper.TakeAll();
//Assert
result.Should().Be("est");
}
private static bool TryTake(StringKeeper stringKeeper, Dictionary <string, ApplyIfToken> tokens, out StringKeeper newStringKeeper, out ApplyIfToken token)
{
var thisToken = tokens.FirstOrDefault(x => stringKeeper.IsNext(x.Key, false));
if (thisToken.Key != null)
{
var work = stringKeeper.Take(thisToken.Key.Length);
newStringKeeper = work;
token = thisToken.Value;
return(true);
}
newStringKeeper = stringKeeper;
token = null;
return(false);
}
private static bool TryTakeIdentifier(StringKeeper stringKeeper, out StringKeeper newStringKeeper, out ApplyIfToken token)
{
var work = new StringKeeper(stringKeeper);
var value = string.Empty;
while (!IsTerminator(work))
{
value += work.Next;
work = work.Take();
}
if (!string.IsNullOrWhiteSpace(value))
{
newStringKeeper = work;
token = new ApplyIfToken(ApplyIfTokenType.Identifier, value);
return(true);
}
newStringKeeper = stringKeeper;
token = null;
return(false);
}
